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authorDenis Bitouzé <dbitouze@wanadoo.fr>2021-02-25 18:23:07 +0000
committerDenis Bitouzé <dbitouze@wanadoo.fr>2021-02-25 18:23:07 +0000
commitc6101f91d071883b48b1b4b51e5eba0f36d9a78d (patch)
tree1bf7f5a881d7a4f5c5bf59d0b2821943dd822372 /Build/source/texk/web2c/luatexdir/tex/maincontrol.c
parent07ee7222e389b0777456b427a55c22d0e6ffd267 (diff)
French translation for tlmgr updated
git-svn-id: svn://tug.org/texlive/trunk@57912 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/web2c/luatexdir/tex/maincontrol.c')
-rw-r--r--Build/source/texk/web2c/luatexdir/tex/maincontrol.c4245
1 files changed, 0 insertions, 4245 deletions
diff --git a/Build/source/texk/web2c/luatexdir/tex/maincontrol.c b/Build/source/texk/web2c/luatexdir/tex/maincontrol.c
deleted file mode 100644
index 22f601ba275..00000000000
--- a/Build/source/texk/web2c/luatexdir/tex/maincontrol.c
+++ /dev/null
@@ -1,4245 +0,0 @@
-/*
-
-maincontrol.w
-
-Copyright 2009-2010 Taco Hoekwater <taco@@luatex.org>
-
-This file is part of LuaTeX.
-
-LuaTeX is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2 of the License, or (at your
-option) any later version.
-
-LuaTeX is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
-License for more details.
-
-You should have received a copy of the GNU General Public License along
-with LuaTeX; if not, see <http://www.gnu.org/licenses/>.
-
-*/
-
-#include "ptexlib.h"
-#include "lua/luatex-api.h"
-
-#define mode mode_par
-#define tail tail_par
-#define head head_par
-#define dir_save dirs_par
-
-/*tex
-
-We come now to the |main_control| routine, which contains the master switch that
-causes all the various pieces of \TeX\ to do their things, in the right order.
-
-In a sense, this is the grand climax of the program: It applies all the tools
-that we have worked so hard to construct. In another sense, this is the messiest
-part of the program: It necessarily refers to other pieces of code all over the
-place, so that a person can't fully understand what is going on without paging
-back and forth to be reminded of conventions that are defined elsewhere. We are
-now at the hub of the web, the central nervous system that touches most of the
-other parts and ties them together. @^brain@>
-
-The structure of |main_control| itself is quite simple. There's a label called
-|big_switch|, at which point the next token of input is fetched using
-|get_x_token|. Then the program branches at high speed into one of about 100
-possible directions, based on the value of the current mode and the newly fetched
-command code; the sum |abs(mode)+cur_cmd| indicates what to do next. For example,
-the case `|vmode+letter|' arises when a letter occurs in vertical mode (or
-internal vertical mode); this case leads to instructions that initialize a new
-paragraph and enter horizontal mode.
-
-The big |case| statement that contains this multiway switch has been labeled
-|reswitch|, so that the program can |goto reswitch| when the next token has
-already been fetched. Most of the cases are quite short; they call an ``action
-procedure'' that does the work for that case, and then they either |goto
-reswitch| or they ``fall through'' to the end of the |case| statement, which
-returns control back to |big_switch|. Thus, |main_control| is not an extremely
-large procedure, in spite of the multiplicity of things it must do; it is small
-enough to be handled by PASCAL compilers that put severe restrictions on
-procedure size. @!@^action procedure@>
-
-One case is singled out for special treatment, because it accounts for most of
-\TeX's activities in typical applications. The process of reading simple text and
-converting it into |char_node| records, while looking for ligatures and kerns, is
-part of \TeX's ``inner loop''; the whole program runs efficiently when its inner
-loop is fast, so this part has been written with particular care.
-
-We leave the |space_factor| unchanged if |sf_code(cur_chr)=0|; otherwise we set
-it equal to |sf_code(cur_chr)|, except that it should never change from a value
-less than 1000 to a value exceeding 1000. The most common case is
-|sf_code(cur_chr)=1000|, so we want that case to be fast.
-
-*/
-
-void adjust_space_factor(void)
-{
- halfword s = get_sf_code(cur_chr);
- if (s == 1000) {
- space_factor_par = 1000;
- } else if (s < 1000) {
- if (s > 0)
- space_factor_par = s;
- } else if (space_factor_par < 1000) {
- space_factor_par = 1000;
- } else {
- space_factor_par = s;
- }
-}
-
-/*tex
-
-To handle the execution state of |main_control|'s eternal loop, an extra global
-variable is used, along with a macro to define its values.
-
-*/
-
-#define goto_next 0
-#define goto_skip_token 1
-#define goto_return 2
-
-static int main_control_state;
-static int local_level = 0;
-
-/*tex
-
-@* Main control helpers.
-
-Here are all the functions that are called from |main_control| that
-are not already defined elsewhere. For the moment, this list simply
-in the order that the appear in |init_main_control|, below.
-
-*/
-
-static void run_char_num (void) {
- scan_char_num();
- cur_chr = cur_val;
- adjust_space_factor();
- tail_append(new_char(cur_font_par, cur_chr));
-}
-
-static void run_char (void) {
- adjust_space_factor();
- tail_append(new_char(cur_font_par, cur_chr));
-}
-
-static void run_node (void) {
- halfword n = cur_chr;
- if (copy_lua_input_nodes_par) {
- n = copy_node_list(n);
- }
- tail_append(n);
- if (nodetype_has_attributes(type(n)) && node_attr(n) == null) {
- build_attribute_list(n);
- }
- while (vlink(n) != null) {
- n = vlink(n);
- tail_append(n);
- if (nodetype_has_attributes(type(n)) && node_attr(n) == null) {
- build_attribute_list(n);
- }
- }
-}
-
-static void run_lua_call(void) {
- if (cur_chr <= 0) {
- normal_error("luacall", "invalid number");
- } else {
- str_number u = save_cur_string();
- luacstrings = 0;
- luafunctioncall(cur_chr);
- restore_cur_string(u);
- if (luacstrings > 0)
- lua_string_start();
- }
-}
-
-/*tex
-
-The occurrence of blank spaces is almost part of \TeX's inner loop, since we
-usually encounter about one space for every five non-blank characters. Therefore
-|main_control| gives second-highest priority to ordinary spaces.
-
-When a glue parameter like \.{\\spaceskip} is set to `\.{0pt}', we will see to it
-later that the corresponding glue specification is precisely |zero_glue|, not
-merely a pointer to some specification that happens to be full of zeroes.
-Therefore it is simple to test whether a glue parameter is zero or~not.
-
-*/
-
-static void run_app_space (void) {
- halfword p; /* was a global temp_ptr */
- int method = disable_space_par ;
- if (method == 1) {
- /*tex Don't inject anything, not even zero skip. */
- } else if (method == 2) {
- p = new_glue(zero_glue);
- couple_nodes(tail,p);
- tail = p;
- } else if ((abs(mode) + cur_cmd == hmode + spacer_cmd) && (!(space_factor_par == 1000))) {
- app_space();
- } else {
- /*tex Append a normal inter-word space to the current list. */
- if (glue_is_zero(space_skip_par)) {
- /*tex Find the glue specification for text spaces in the current font. */
- p = new_glue(zero_glue);
- width(p) = space(cur_font_par);
- stretch(p) = space_stretch(cur_font_par);
- shrink(p) = space_shrink(cur_font_par);
-
- } else {
- p = new_param_glue(space_skip_code);
- }
- /*tex So from now we have a subtype with spaces: */
- subtype(p) = space_skip_code + 1 ;
- couple_nodes(tail,p);
- tail = p;
- }
-}
-
-/*tex
-
-Append a |boundary_node|
-
-*/
-
-static void run_boundary (void) {
- halfword n ;
- n = new_node(boundary_node,cur_chr);
- if ((cur_chr == 1) || (cur_chr == 2) ) {
- /*tex We expect a user boundary or protrusion boundary. */
- scan_int();
- boundary_value(n) = cur_val;
- }
- couple_nodes(tail, n);
- tail = n;
-}
-
-static void run_char_ghost (void) {
- int t;
- t = cur_chr;
- get_x_token();
- if ((cur_cmd == letter_cmd) || (cur_cmd == other_char_cmd)
- || (cur_cmd == char_given_cmd) || (cur_cmd == char_num_cmd)) {
- halfword p = new_glyph(get_cur_font(), cur_chr);
- if (t == 0) {
- set_is_leftghost(p);
- } else {
- set_is_rightghost(p);
- }
- tail_append(p);
- }
-}
-
-static void run_relax (void) {
- return;
-}
-
-/*tex
-
-|ignore_spaces| is a special case: after it has acted, |get_x_token| has already
-fetched the next token from the input, so that operation in |main_control| should
-be skipped.
-
-*/
-
-static void run_ignore_spaces (void) {
- if (cur_chr == 0) {
- /*tex Get the next non-blank non-call... */
- do {
- get_x_token();
- } while (cur_cmd == spacer_cmd);
- main_control_state = goto_skip_token;
- } else {
- int t = scanner_status;
- scanner_status = normal;
- get_next();
- scanner_status = t;
- cur_cs = prim_lookup(cs_text(cur_cs));
- if (cur_cs != undefined_primitive) {
- cur_cmd = get_prim_eq_type(cur_cs);
- cur_chr = get_prim_equiv(cur_cs);
- cur_tok = (cur_cmd * STRING_OFFSET) + cur_chr;
- main_control_state = goto_skip_token;
- }
- }
-}
-
-/*tex
-
-|stop| is the second special case. We want |main_control| to return to its caller
-if there is nothing left to do.
-
-*/
-
-static void run_stop (void) {
- if (its_all_over()) {
- /*tex this is the only way out */
- main_control_state= goto_return;
- }
-}
-
-static void run_non_math_math (void) {
- back_input();
- new_graf(true);
-}
-
-/*tex
-
- We build up an argument to |set_math_char|:
-
-*/
-
-static void run_math_char_num (void) {
- mathcodeval mval;
- if (cur_chr == 0)
- mval = scan_mathchar(tex_mathcode);
- else if (cur_chr == 1)
- mval = scan_mathchar(umath_mathcode);
- else
- mval = scan_mathchar(umathnum_mathcode);
- math_char_in_text(mval);
-}
-
-/*tex
-
- We build up an argument to |set_math_char|:
-*/
-
-static void run_math_given (void) {
- mathcodeval mval;
- mval = mathchar_from_integer(cur_chr, tex_mathcode);
- math_char_in_text(mval);
-}
-
-/*tex
-
- We build up an argument to |set_math_char| the \LUATEX\ way:
-*/
-
-static void run_xmath_given (void) {
- mathcodeval mval;
- mval = mathchar_from_integer(cur_chr, umath_mathcode);
- math_char_in_text(mval);
-}
-
-/*tex
-
-The most important parts of |main_control| are concerned with \TeX's chief
-mission of box-making. We need to control the activities that put entries on
-vlists and hlists, as well as the activities that convert those lists into boxes.
-All of the necessary machinery has already been developed; it remains for us to
-``push the buttons'' at the right times.
-
-As an introduction to these routines, let's consider one of the simplest cases:
-What happens when `\.{\\hrule}' occurs in vertical mode, or `\.{\\vrule}' in
-horizontal mode or math mode? The code in |main_control| is short, since the
-|scan_rule_spec| routine already does most of what is required; thus, there is no
-need for a special action procedure.
-
-Note that baselineskip calculations are disabled after a rule in vertical mode,
-by setting |prev_depth:=ignore_depth|.
-
-*/
-
-static void run_rule (void) {
- tail_append(scan_rule_spec());
- if (abs(mode) == vmode)
- prev_depth_par = ignore_depth;
- else if (abs(mode) == hmode)
- space_factor_par = 1000;
-}
-
-/*tex
-
-Many of the actions related to box-making are triggered by the appearance of
-braces in the input. For example, when the user says `\.{\\hbox} \.{to}
-\.{100pt\{$\langle\,\hbox{hlist}\,\rangle$\}}' in vertical mode, the information
-about the box size (100pt, |exactly|) is put onto |save_stack| with a level
-boundary word just above it, and |cur_group:=adjusted_hbox_group|; \TeX\ enters
-restricted horizontal mode to process the hlist. The right brace eventually
-causes |save_stack| to be restored to its former state, at which time the
-information about the box size (100pt, |exactly|) is available once again; a box
-is packaged and we leave restricted horizontal mode, appending the new box to the
-current list of the enclosing mode (in this case to the current list of vertical
-mode), followed by any vertical adjustments that were removed from the box by
-|hpack|.
-
-The next few sections of the program are therefore concerned with the treatment
-of left and right curly braces.
-
-If a left brace occurs in the middle of a page or paragraph, it simply introduces
-a new level of grouping, and the matching right brace will not have such a
-drastic effect. Such grouping affects neither the mode nor the current list.
-
-*/
-
-static void run_left_brace (void) {
- new_save_level(simple_group);
- eq_word_define(int_base + no_local_whatsits_code, 0);
- eq_word_define(int_base + no_local_dirs_code, 0);
-}
-
-static void run_begin_group (void) {
- new_save_level(semi_simple_group);
- eq_word_define(int_base + no_local_whatsits_code, 0);
- eq_word_define(int_base + no_local_dirs_code, 0);
-}
-
-static void run_end_group (void) {
- if (cur_group == semi_simple_group) {
- fixup_directions();
- } else {
- off_save();
- }
-}
-
-/*tex
-
-Constructions that require a box are started by calling |scan_box| with a
-specified context code. The |scan_box| routine verifies that a |make_box| command
-comes next and then it calls |begin_box|.
-
-*/
-
-static void run_move (void) {
- int t = cur_chr;
- scan_normal_dimen();
- if (t == 0)
- scan_box(cur_val);
- else
- scan_box(-cur_val);
-}
-
-static void run_leader_ship (void) {
- scan_box(leader_flag - a_leaders + cur_chr);
-}
-
-static void run_make_box (void) {
- begin_box(0);
-}
-
-static void run_box_dir (void) {
- scan_register_num();
- cur_box = box(cur_val);
- scan_optional_equals();
- scan_direction();
- if (cur_box != null)
- box_dir(cur_box) = cur_val;
-}
-
-static void run_box_direction (void) {
- scan_register_num();
- cur_box = box(cur_val);
- scan_optional_equals();
- scan_int();
- check_dir_value(cur_val);
- if (cur_box != null)
- box_dir(cur_box) = cur_val;
-}
-
-/*tex
-
-There is a really small patch to add a new primitive called \.{\\quitvmode}. In
-vertical modes, it is identical to \.{\\indent}, but in horizontal and math modes
-it is really a no-op (as opposed to \.{\\indent}, which executes the
-|indent_in_hmode| procedure).
-
-A paragraph begins when horizontal-mode material occurs in vertical mode, or when
-the paragraph is explicitly started by `\.{\\quitvmode}', `\.{\\indent}' or
-`\.{\\noindent}'.
-
-*/
-
-static void run_start_par_vmode (void) {
- new_graf((cur_chr > 0));
-}
-
-static void run_start_par (void) {
- if (cur_chr != 2)
- indent_in_hmode();
-}
-
-static void run_new_graf (void) {
- back_input();
- new_graf(true);
-}
-
-/*tex
-
-A paragraph ends when a |par_end| command is sensed, or when we are in horizontal
-mode when reaching the right brace of vertical-mode routines like \.{\\vbox},
-\.{\\insert}, or \.{\\output}.
-
-*/
-
-static void run_par_end_vmode (void) {
- normal_paragraph();
- if (mode > 0) {
- checked_page_filter(vmode_par);
- build_page();
- }
-}
-
-static void run_par_end_hmode (void) {
- if (align_state < 0) {
- /*tex This tries to recover from an alignment that didn't end properly. */
- off_save();
- }
- /* This takes us to the enclosing mode, if |mode>0|. */
- end_graf(bottom_level);
- if (mode == vmode) {
- checked_page_filter(hmode_par);
- build_page();
- }
-}
-
-static void append_italic_correction_mmode (void) {
- tail_append(new_kern(0));
-}
-
-static void run_local_box (void) {
- append_local_box(cur_chr);
-}
-
-static void run_halign_mmode (void) {
- if (privileged()) {
- if (cur_group == math_shift_group)
- init_align();
- else
- off_save();
- }
-}
-
-static void run_eq_no (void) {
- if (privileged()) {
- if (cur_group == math_shift_group)
- start_eq_no();
- else
- off_save();
- }
-}
-
-static void run_letter_mmode (void) {
- set_math_char(get_math_code(cur_chr));
-}
-
-static void run_char_num_mmode (void) {
- scan_char_num();
- cur_chr = cur_val;
- set_math_char(get_math_code(cur_chr));
-}
-
-static void run_math_char_num_mmode (void) {
- mathcodeval mval;
- if (cur_chr == 0)
- mval = scan_mathchar(tex_mathcode);
- else if (cur_chr == 1)
- mval = scan_mathchar(umath_mathcode);
- else
- mval = scan_mathchar(umathnum_mathcode);
- set_math_char(mval);
-}
-
-static void run_math_given_mmode (void) {
- mathcodeval mval;
- mval = mathchar_from_integer(cur_chr, tex_mathcode);
- set_math_char(mval);
-}
-
-static void run_xmath_given_mmode (void) {
- mathcodeval mval;
- mval = mathchar_from_integer(cur_chr, umath_mathcode);
- set_math_char(mval);
-}
-
-static void run_delim_num (void) {
- mathcodeval mval;
- if (cur_chr == 0)
- mval = scan_delimiter_as_mathchar(tex_mathcode);
- else
- mval = scan_delimiter_as_mathchar(umath_mathcode);
- set_math_char(mval);
-}
-
-static void run_vcenter (void) {
- scan_spec(vcenter_group);
- normal_paragraph();
- push_nest();
- mode = -vmode;
- prev_depth_par = ignore_depth;
- if (every_vbox_par != null)
- begin_token_list(every_vbox_par, every_vbox_text);
-}
-
-static void run_math_style (void) {
- tail_append(new_style((small_number) cur_chr));
-}
-
-static void run_non_script (void) {
- tail_append(new_glue(zero_glue));
- subtype(tail) = cond_math_glue;
-}
-
-static void run_math_choice (void) {
- if (cur_chr == 0)
- append_choices();
- else
- setup_math_style();
-}
-
-static void run_math_shift (void) {
- if (cur_group == math_shift_group)
- after_math();
- else
- off_save();
-}
-
-static void run_after_assignment (void) {
- get_token();
- after_token = cur_tok;
-}
-
-static void run_after_group (void) {
- get_token();
- save_for_after(cur_tok);
-}
-
-static void run_extension (void) {
- do_extension(0);
-}
-
-static void run_normal (void) {
-{
- switch (cur_chr) {
- case save_pos_code:
- new_whatsit(save_pos_node);
- break;
- case save_cat_code_table_code:
- scan_int();
- if ((cur_val < 0) || (cur_val > 0x7FFF)) {
- print_err("Invalid \\catcode table");
- help1(
- "All \\catcode table ids must be between 0 and 0x7FFF"
- );
- error();
- } else {
- if (cur_val == cat_code_table_par) {
- print_err("Invalid \\catcode table");
- help1(
- "You cannot overwrite the current \\catcode table"
- );
- error();
- } else {
- copy_cat_codes(cat_code_table_par, cur_val);
- }
- }
- break;
- case init_cat_code_table_code:
- scan_int();
- if ((cur_val < 0) || (cur_val > 0x7FFF)) {
- print_err("Invalid \\catcode table");
- help1(
- "All \\catcode table ids must be between 0 and 0x7FFF"
- );
- error();
- } else {
- if (cur_val == cat_code_table_par) {
- print_err("Invalid \\catcode table");
- help1(
- "You cannot overwrite the current \\catcode table"
- );
- error();
- } else {
- initex_cat_codes(cur_val);
- }
- }
- break;
- case set_random_seed_code:
- /* Negative random seed values are silently converted to positive ones */
- scan_int();
- if (cur_val < 0)
- negate(cur_val);
- random_seed = cur_val;
- init_randoms(random_seed);
- break;
- case late_lua_code:
- new_whatsit(late_lua_node); /* type == normal */
- late_lua_name(tail) = scan_lua_state();
- (void) scan_toks(false, false);
- late_lua_data(tail) = def_ref;
- break;
- case late_lua_call_code:
- new_whatsit(late_lua_node);
- late_lua_type(tail) = lua_refid_call;
- scan_int();
- late_lua_data(tail) = cur_val;
- break;
- case expand_font_code:
- read_expand_font();
- break;
- default:
- confusion("int1");
- break;
- }
- }
-}
-
-/*tex
-
-This is experimental and not used for production, only for testing and writing
-macros (some options stay).
-
-*/
-
-#define mathoption_set_int(A) \
- scan_int(); \
- word_define(mathoption_int_base+A, cur_val);
-
-static void run_option(void) {
- int a = 0 ;
- switch (cur_chr) {
- case math_option_code:
- if (scan_keyword("old")) {
- mathoption_set_int(c_mathoption_old_code);
- /*
- } else if (scan_keyword("umathcodemeaning")) {
- mathoption_set_int(c_mathoption_umathcode_meaning_code);
- */
- } else {
- normal_warning("mathoption","unknown key");
- }
- break;
- default:
- /* harmless */
- break;
- }
-}
-
-static void lua_function_call(void) {
- scan_int();
- if (cur_val <= 0) {
- normal_error("luafunctioncall", "invalid number");
- } else {
- str_number u = save_cur_string();
- luacstrings = 0;
- luafunctioncall(cur_val);
- restore_cur_string(u);
- if (luacstrings > 0)
- lua_string_start();
- }
-}
-
-static void lua_bytecode_call(void) {
- scan_int();
- if (cur_val < 0 || cur_val > 65535) {
- normal_error("luabytecodecall", "invalid number");
- } else {
- str_number u = save_cur_string();
- luacstrings = 0;
- luabytecodecall(cur_val);
- restore_cur_string(u);
- if (luacstrings > 0)
- lua_string_start();
- }
-}
-
-/*tex
-
-For mode-independent commands, the following macro is useful.
-
-Also, there is a list of cases where the user has probably gotten into or out of
-math mode by mistake. \TeX\ will insert a dollar sign and rescan the current
-token, and it makes sense ot have a macro for that as well.
-
-*/
-
-#define any_mode(A,B) jump_table[vmode+(A)]=B; jump_table[hmode+(A)]=B; jump_table[mmode+(A)]=B
-#define non_math(A,B) jump_table[vmode+(A)]=B; jump_table[hmode+(A)]=B;
-
-/*tex
-
-The |main_control| uses a jump table, and |init_main_control| sets that table up.
-
-*/
-
-typedef void (*main_control_function) (void);
-
-main_control_function *jump_table;
-
-static void init_main_control (void) {
- jump_table = xmalloc((mmode+max_command_cmd+1) * sizeof(main_control_function)) ;
-
- jump_table[hmode + char_num_cmd] = run_char_num;
- jump_table[hmode + letter_cmd] = run_char;
- jump_table[hmode + other_char_cmd] = run_char;
- jump_table[hmode + char_given_cmd] = run_char;
- jump_table[hmode + spacer_cmd] = run_app_space;
- jump_table[hmode + ex_space_cmd] = run_app_space;
- jump_table[mmode + ex_space_cmd] = run_app_space;
- jump_table[hmode + boundary_cmd] = run_boundary;
- jump_table[hmode + char_ghost_cmd] = run_char_ghost;
- jump_table[mmode + char_ghost_cmd] = run_char_ghost;
- any_mode(relax_cmd, run_relax);
- jump_table[vmode + spacer_cmd] = run_relax;
- jump_table[mmode + spacer_cmd] = run_relax;
- jump_table[mmode + boundary_cmd] = run_relax;
- any_mode(ignore_spaces_cmd,run_ignore_spaces);
- jump_table[vmode + stop_cmd] = run_stop;
- jump_table[vmode + math_char_num_cmd] = run_non_math_math;
- jump_table[vmode + math_given_cmd] = run_non_math_math;
- jump_table[vmode + xmath_given_cmd] = run_non_math_math;
- jump_table[hmode + math_char_num_cmd] = run_math_char_num;
- jump_table[hmode + math_given_cmd] = run_math_given;
- jump_table[hmode + xmath_given_cmd] = run_xmath_given;
-
- jump_table[vmode + vmove_cmd] = report_illegal_case;
- jump_table[hmode + hmove_cmd] = report_illegal_case;
- jump_table[mmode + hmove_cmd] = report_illegal_case;
- any_mode(last_item_cmd, report_illegal_case);
- jump_table[vmode + vadjust_cmd] = report_illegal_case;
- jump_table[vmode + ital_corr_cmd] = report_illegal_case;
- non_math(eq_no_cmd,report_illegal_case);
- any_mode(mac_param_cmd,report_illegal_case);
-
- non_math(sup_mark_cmd, insert_dollar_sign);
- non_math(sub_mark_cmd, insert_dollar_sign);
- non_math(super_sub_script_cmd, insert_dollar_sign);
- non_math(no_super_sub_script_cmd, insert_dollar_sign);
- non_math(math_comp_cmd, insert_dollar_sign);
- non_math(delim_num_cmd, insert_dollar_sign);
- non_math(left_right_cmd, insert_dollar_sign);
- non_math(above_cmd, insert_dollar_sign);
- non_math(radical_cmd, insert_dollar_sign);
- non_math(math_style_cmd, insert_dollar_sign);
- non_math(math_choice_cmd, insert_dollar_sign);
- non_math(vcenter_cmd, insert_dollar_sign);
- non_math(non_script_cmd, insert_dollar_sign);
- non_math(mkern_cmd, insert_dollar_sign);
- non_math(limit_switch_cmd, insert_dollar_sign);
- non_math(mskip_cmd, insert_dollar_sign);
- non_math(math_accent_cmd, insert_dollar_sign);
- jump_table[mmode + endv_cmd] = insert_dollar_sign;
- jump_table[mmode + par_end_cmd] = insert_dollar_sign_par_end;
- jump_table[mmode + stop_cmd] = insert_dollar_sign;
- jump_table[mmode + vskip_cmd] = insert_dollar_sign;
- jump_table[mmode + un_vbox_cmd] = insert_dollar_sign;
- jump_table[mmode + valign_cmd] = insert_dollar_sign;
- jump_table[mmode + hrule_cmd] = insert_dollar_sign;
- jump_table[mmode + no_hrule_cmd] = insert_dollar_sign;
- jump_table[vmode + hrule_cmd] = run_rule;
- jump_table[vmode + no_hrule_cmd] = run_rule;
- jump_table[hmode + vrule_cmd] = run_rule;
- jump_table[hmode + no_vrule_cmd] = run_rule;
- jump_table[mmode + vrule_cmd] = run_rule;
- jump_table[mmode + no_vrule_cmd] = run_rule;
- jump_table[vmode + vskip_cmd] = append_glue;
- jump_table[hmode + hskip_cmd] = append_glue;
- jump_table[mmode + hskip_cmd] = append_glue;
- jump_table[mmode + mskip_cmd] = append_glue;
- any_mode(kern_cmd, append_kern);
- jump_table[mmode + mkern_cmd] = append_kern;
- non_math(left_brace_cmd, run_left_brace);
- any_mode(begin_group_cmd,run_begin_group);
- any_mode(end_group_cmd, run_end_group);
- any_mode(right_brace_cmd, handle_right_brace);
- jump_table[vmode + hmove_cmd] = run_move;
- jump_table[hmode + vmove_cmd] = run_move;
- jump_table[mmode + vmove_cmd] = run_move;
- any_mode(leader_ship_cmd, run_leader_ship);
- any_mode(make_box_cmd, run_make_box);
- any_mode(assign_box_dir_cmd, run_box_dir);
- any_mode(assign_box_direction_cmd, run_box_direction);
- jump_table[vmode + start_par_cmd] = run_start_par_vmode;
- jump_table[hmode + start_par_cmd] = run_start_par;
- jump_table[mmode + start_par_cmd] = run_start_par;
- jump_table[vmode + letter_cmd] = run_new_graf;
- jump_table[vmode + other_char_cmd] = run_new_graf;
- jump_table[vmode + char_num_cmd] = run_new_graf;
- jump_table[vmode + char_given_cmd] = run_new_graf;
- jump_table[vmode + char_ghost_cmd] = run_new_graf;
- jump_table[vmode + math_shift_cmd] = run_new_graf;
- jump_table[vmode + math_shift_cs_cmd] = run_new_graf;
- jump_table[vmode + un_hbox_cmd] = run_new_graf;
- jump_table[vmode + vrule_cmd] = run_new_graf;
- jump_table[vmode + no_vrule_cmd] = run_new_graf;
- jump_table[vmode + accent_cmd] = run_new_graf;
- jump_table[vmode + discretionary_cmd] = run_new_graf;
- jump_table[vmode + hskip_cmd] = run_new_graf;
- jump_table[vmode + valign_cmd] = run_new_graf;
- jump_table[vmode + ex_space_cmd] = run_new_graf;
- jump_table[vmode + boundary_cmd] = run_new_graf;
- jump_table[vmode + par_end_cmd] = run_par_end_vmode;
- jump_table[hmode + par_end_cmd] = run_par_end_hmode;
- jump_table[hmode + stop_cmd] = head_for_vmode;
- jump_table[hmode + vskip_cmd] = head_for_vmode;
- jump_table[hmode + hrule_cmd] = head_for_vmode;
- jump_table[hmode + no_hrule_cmd] = head_for_vmode;
- jump_table[hmode + un_vbox_cmd] = head_for_vmode;
- jump_table[hmode + halign_cmd] = head_for_vmode;
- any_mode(insert_cmd,begin_insert_or_adjust);
- jump_table[hmode + vadjust_cmd] = begin_insert_or_adjust;
- jump_table[mmode + vadjust_cmd] = begin_insert_or_adjust;
- any_mode(mark_cmd, handle_mark);
- any_mode(break_penalty_cmd, append_penalty);
- any_mode(remove_item_cmd, delete_last);
- jump_table[vmode + un_vbox_cmd] = unpackage;
- jump_table[hmode + un_hbox_cmd] = unpackage;
- jump_table[mmode + un_hbox_cmd] = unpackage;
- jump_table[hmode + ital_corr_cmd] = append_italic_correction;
- jump_table[mmode + ital_corr_cmd] = append_italic_correction_mmode;
- jump_table[hmode + discretionary_cmd] = append_discretionary;
- jump_table[mmode + discretionary_cmd] = append_discretionary;
- any_mode(assign_local_box_cmd, run_local_box);
- jump_table[hmode + accent_cmd] = make_accent;
- any_mode(car_ret_cmd,align_error);
- any_mode(tab_mark_cmd,align_error);
- any_mode(no_align_cmd,no_align_error);
- any_mode(omit_cmd, omit_error);
- jump_table[vmode + halign_cmd] = init_align;
- jump_table[hmode + valign_cmd] = init_align;
- jump_table[mmode + halign_cmd] = run_halign_mmode;
- jump_table[vmode + endv_cmd] = do_endv;
- jump_table[hmode + endv_cmd] = do_endv;
- any_mode(end_cs_name_cmd, cs_error);
- jump_table[hmode + math_shift_cmd] = init_math;
- jump_table[hmode + math_shift_cs_cmd] = init_math;
- jump_table[mmode + eq_no_cmd] = run_eq_no;
- jump_table[mmode + left_brace_cmd] = math_left_brace;
- jump_table[mmode + letter_cmd] = run_letter_mmode;
- jump_table[mmode + other_char_cmd] = run_letter_mmode;
- jump_table[mmode + char_given_cmd] = run_letter_mmode;
- jump_table[mmode + char_num_cmd] = run_char_num_mmode;
- jump_table[mmode + math_char_num_cmd] = run_math_char_num_mmode;
- jump_table[mmode + math_given_cmd] = run_math_given_mmode;
- jump_table[mmode + xmath_given_cmd] = run_xmath_given_mmode;
- jump_table[mmode + delim_num_cmd] = run_delim_num;
- jump_table[mmode + math_comp_cmd] = math_math_comp;
- jump_table[mmode + limit_switch_cmd] = math_limit_switch;
- jump_table[mmode + radical_cmd] = math_radical;
- jump_table[mmode + accent_cmd] = math_ac;
- jump_table[mmode + math_accent_cmd] = math_ac;
- jump_table[mmode + vcenter_cmd] = run_vcenter;
- jump_table[mmode + math_style_cmd] = run_math_style;
- jump_table[mmode + non_script_cmd] = run_non_script;
- jump_table[mmode + math_choice_cmd] = run_math_choice;
- jump_table[mmode + above_cmd] = math_fraction;
- jump_table[mmode + sub_mark_cmd] = sub_sup;
- jump_table[mmode + sup_mark_cmd] = sub_sup;
- jump_table[mmode + super_sub_script_cmd] = sub_sup;
- jump_table[mmode + no_super_sub_script_cmd] = no_sub_sup;
- jump_table[mmode + left_right_cmd] = math_left_right;
- jump_table[mmode + math_shift_cmd] = run_math_shift;
- jump_table[mmode + math_shift_cs_cmd] = run_math_shift;
- any_mode(toks_register_cmd, prefixed_command);
- any_mode(assign_toks_cmd, prefixed_command);
- any_mode(assign_int_cmd, prefixed_command);
- any_mode(assign_attr_cmd, prefixed_command);
- any_mode(assign_dir_cmd, prefixed_command);
- any_mode(assign_direction_cmd, prefixed_command);
- any_mode(assign_dimen_cmd, prefixed_command);
- any_mode(assign_glue_cmd, prefixed_command);
- any_mode(assign_mu_glue_cmd, prefixed_command);
- any_mode(assign_font_dimen_cmd, prefixed_command);
- any_mode(assign_font_int_cmd, prefixed_command);
- any_mode(set_aux_cmd, prefixed_command);
- any_mode(set_prev_graf_cmd, prefixed_command);
- any_mode(set_page_dimen_cmd, prefixed_command);
- any_mode(set_page_int_cmd, prefixed_command);
- any_mode(set_box_dimen_cmd, prefixed_command);
- any_mode(set_tex_shape_cmd, prefixed_command);
- any_mode(set_etex_shape_cmd, prefixed_command);
- any_mode(def_char_code_cmd, prefixed_command);
- any_mode(def_del_code_cmd, prefixed_command);
- any_mode(extdef_math_code_cmd, prefixed_command);
- any_mode(extdef_del_code_cmd, prefixed_command);
- any_mode(def_family_cmd, prefixed_command);
- any_mode(set_math_param_cmd, prefixed_command);
- any_mode(set_font_cmd, prefixed_command);
- any_mode(def_font_cmd, prefixed_command);
- any_mode(letterspace_font_cmd, prefixed_command);
- any_mode(copy_font_cmd, prefixed_command);
- any_mode(set_font_id_cmd, prefixed_command);
- any_mode(register_cmd, prefixed_command);
- any_mode(advance_cmd, prefixed_command);
- any_mode(multiply_cmd, prefixed_command);
- any_mode(divide_cmd, prefixed_command);
- any_mode(prefix_cmd, prefixed_command);
- any_mode(let_cmd, prefixed_command);
- any_mode(shorthand_def_cmd, prefixed_command);
- any_mode(read_to_cs_cmd, prefixed_command);
- any_mode(def_cmd, prefixed_command);
- any_mode(set_box_cmd, prefixed_command);
- any_mode(hyph_data_cmd, prefixed_command);
- any_mode(set_interaction_cmd, prefixed_command);
- any_mode(after_assignment_cmd,run_after_assignment);
- any_mode(after_group_cmd,run_after_group);
- any_mode(in_stream_cmd,open_or_close_in);
- any_mode(message_cmd,issue_message);
- any_mode(case_shift_cmd, shift_case);
- any_mode(xray_cmd, show_whatever);
- any_mode(normal_cmd, run_normal);
- any_mode(extension_cmd, run_extension);
- any_mode(option_cmd, run_option);
-
- any_mode(lua_function_call_cmd, lua_function_call);
- any_mode(lua_bytecode_call_cmd, lua_bytecode_call);
- any_mode(def_lua_call_cmd, prefixed_command);
- any_mode(lua_call_cmd, run_lua_call);
- /* any_mode(lua_expandable_call_cmd, run_lua_call); */ /* no! outside jump table anyway, handled in expand() */
- any_mode(node_cmd, run_node);
-
- any_mode(combine_toks_cmd, combine_the_toks);
-}
-
-/*tex
-
- And here is |main_control| itself. It is quite short nowadays.
-
-*/
-
-void main_control(void)
-{
- main_control_state = goto_next;
- init_main_control() ;
- if (equiv(every_job_loc) != null) {
- begin_token_list(equiv(every_job_loc), every_job_text);
- }
- while (1) {
- if (main_control_state == goto_skip_token) {
- main_control_state = goto_next;
- } else {
- get_x_token();
- }
- /*tex
- Give diagnostic information, if requested When a new token has just
- been fetched at |big_switch|, we have an ideal place to monitor
- \TeX's activity.
- */
- if (interrupt != 0 && OK_to_interrupt) {
- back_input();
- check_interrupt();
- continue;
- }
- if (tracing_commands_par > 0) {
- show_cur_cmd_chr();
- }
- /*tex run the command */
- (jump_table[(abs(mode) + cur_cmd)])();
- if (main_control_state == goto_return) {
- return;
- }
- }
- /*tex not reached */
- return;
-}
-
-/*tex
-
-We assume a trailing relax: |{...}\relax|, so we don't need a |back_input()| here.
-
-*/
-
-extern void local_control_message(const char *s)
-{
- tprint("local control level ");
- print_int(local_level);
- tprint(": ");
- tprint(s);
- tprint_nl("");
-}
-
-/*tex Note for me (HH): in luametatex I have the option to use the save stack which for
- some experiments seems to work better. But I'll probably not go forward with
- some intended extension anyway (too messy), so we're currently in sync.
- Instead there are now two optional parameters in |runtoks|, plus a |quittoks|
- companion. I also added some more tracing as well as a warning when we jump
- out of control too often.
-*/
-
-void local_control(void)
-{
- /*tex Wrr to saving the state local_control is like some of the conv_toks which
- is not entirely correct but good enough for now. Future extensions might
- demand another solution.
- */
- int save_scanner_status = scanner_status;
- halfword save_def_ref = def_ref;
- halfword save_warning_index = warning_index;
- int ll = local_level;
- main_control_state = goto_next;
- local_level += 1;
- if (tracing_nesting_par > 2) {
- local_control_message("entering local control");
- }
- while (1) {
- if (main_control_state == goto_skip_token) {
- main_control_state = goto_next;
- } else {
- get_x_token();
- }
- if (interrupt != 0 && OK_to_interrupt) {
- back_input();
- check_interrupt();
- continue;
- }
- if (tracing_commands_par > 0) {
- show_cur_cmd_chr();
- }
- (jump_table[(abs(mode) + cur_cmd)])();
- if (local_level <= ll) {
- main_control_state = goto_next;
- if (tracing_nesting_par > 2) {
- local_control_message("leaving local control due to level change");
- }
- break;
- } else if (main_control_state == goto_return) {
- if (tracing_nesting_par > 2) {
- local_control_message("leaving local control due to triggering");
- }
- break;
- }
- }
- /*tex From the perspective of ending and changing the level this is the
- wrong spot, as it should be done in |end_local_control| in which case
- we should use the save stack. Maybe some day.
- */
- scanner_status = save_scanner_status;
- def_ref = save_def_ref;
- warning_index = save_warning_index;
-}
-
-void end_local_control(void )
-{
- if (local_level > 0) {
- local_level -= 1;
- } else {
- local_control_message("redundant end local control");
- }
-}
-
-/*tex
- We need to go back to the main loop. This is rather nasty and dirty
- and counterintuive code and there might be a cleaner way. Basically
- we trigger the main control state from here.
-
- \starttyping
- 0 0 \directlua{token.scan_list()}\hbox{!}
- -1 0 \setbox0\hbox{x}\directlua{token.scan_list()}\box0
- 1 1 \toks0={\directlua{token.scan_list()}\hbox{x}}\directlua{tex.runtoks(0)}
- 0 0 1 1 \directlua{tex.box[0]=token.scan_list()}\hbox{x\directlua{node.write(token.scan_list())}\hbox{x}}
- 0 0 0 1 \setbox0\hbox{x}\directlua{tex.box[0]=token.scan_list()}\hbox{x\directlua{node.write(token.scan_list())}\box0}
- \stoptyping
-
- It's rather fragile code so we added some tracing options.
-
-*/
-
-halfword local_scan_box(void)
-{
- int old_mode = mode;
- int ll = local_level;
- mode = -hmode;
- scan_box(lua_scan_flag);
- if (local_level == ll) {
- /*tex |\directlua{print(token.scan_list())}\hbox{!}| (n n) */
- if (tracing_nesting_par > 2) {
- local_control_message("entering at end of box scanning");
- }
- local_control();
- } else {
- /*tex |\directlua{print(token.scan_list())}\box0| (n-1 n) */
- /*
- if (tracing_nesting_par > 2) {
- local_control_message("setting level after box scanning");
- }
- */
- local_level = ll;
- }
- mode = old_mode;
- return cur_box;
-}
-
-/*tex
-
- We have an issue with modes when we quit here because we're coming
- from and still staying at the \LUA\ end. So, unless we're already
- nested, we trigger an end_local_level token (an extension code).
-
-*/
-
-static void wrapup_local_scan_box(void)
-{
- /*
- if (tracing_nesting_par > 2) {
- local_control_message("leaving box scanner");
- }
- */
- local_level -= 1;
-}
-
-int current_local_level(void)
-{
- return local_level;
-}
-
-void app_space(void)
-{ /* handle spaces when |space_factor<>1000| */
- halfword q; /* glue node */
- if ((space_factor_par >= 2000) && (! glue_is_zero(xspace_skip_par))) {
- q = new_param_glue(xspace_skip_code);
- /* so from now we have a subtype with spaces: */
- subtype(q) = xspace_skip_code + 1;
- } else {
- if (!glue_is_zero(space_skip_par)) {
- q = new_glue(space_skip_par);
- } else {
- q = new_glue(zero_glue);
- width(q) = space(cur_font_par);
- stretch(q) = space_stretch(cur_font_par);
- shrink(q) = space_shrink(cur_font_par);
- }
- /* Modify the glue specification in |q| according to the space factor */
- if (space_factor_par >= 2000)
- width(q) = width(q) + extra_space(cur_font_par);
- stretch(q) = xn_over_d(stretch(q), space_factor_par, 1000);
- shrink(q) = xn_over_d(shrink(q), 1000, space_factor_par);
-
- /* so from now we have a subtype with spaces: */
- subtype(q) = space_skip_code + 1;
- }
- couple_nodes(tail, q);
- tail = q;
-}
-
-void insert_dollar_sign(void)
-{
- back_input();
- cur_tok = math_shift_token + '$';
- print_err("Missing $ inserted");
- help2(
- "I've inserted a begin-math/end-math symbol since I think",
- "you left one out. Proceed, with fingers crossed."
- );
- ins_error();
-}
-
-/*tex
-
- We can silently ignore \.{\\par}s in a math formula.
-
-*/
-
-void insert_dollar_sign_par_end(void)
-{
- if (!suppress_mathpar_error_par) {
- insert_dollar_sign() ;
- }
-}
-
-/*tex
-
-The `|you_cant|' procedure prints a line saying that the current command is
-illegal in the current mode; it identifies these things symbolically.
-
-*/
-
-void you_cant(void)
-{
- print_err("You can't use `");
- print_cmd_chr((quarterword) cur_cmd, cur_chr);
- print_in_mode(mode);
-}
-
-/*tex
-
-When erroneous situations arise, \TeX\ usually issues an error message specific
-to the particular error. For example, `\.{\\noalign}' should not appear in any
-mode, since it is recognized by the |align_peek| routine in all of its legitimate
-appearances; a special error message is given when `\.{\\noalign}' occurs
-elsewhere. But sometimes the most appropriate error message is simply that the
-user is not allowed to do what he or she has attempted. For example,
-`\.{\\moveleft}' is allowed only in vertical mode, and `\.{\\lower}' only in
-non-vertical modes. Such cases are enumerated here and in the other sections
-referred to under `See also \dots.'
-
-*/
-
-void report_illegal_case(void)
-{
- you_cant();
- help4(
- "Sorry, but I'm not programmed to handle this case;",
- "I'll just pretend that you didn''t ask for it.",
- "If you're in the wrong mode, you might be able to",
- "return to the right one by typing `I}' or `I$' or `I\\par'."
- );
- error();
-}
-
-/*tex
-
-Some operations are allowed only in privileged modes, i.e., in cases that
-|mode>0|. The |privileged| function is used to detect violations of this rule; it
-issues an error message and returns |false| if the current |mode| is negative.
-
-*/
-
-boolean privileged(void)
-{
- if (mode > 0) {
- return true;
- } else {
- report_illegal_case();
- return false;
- }
-}
-
-/*tex
-
-We don't want to leave |main_control| immediately when a |stop| command is
-sensed, because it may be necessary to invoke an \.{\\output} routine several
-times before things really grind to a halt. (The output routine might even say
-`\.{\\gdef\\end\{...\}}', to prolong the life of the job.) Therefore
-|its_all_over| is |true| only when the current page and contribution list are
-empty, and when the last output was not a ``dead cycle.''
-
-*/
-
-
-boolean its_all_over(void)
-{ /* do this when \.{\\end} or \.{\\dump} occurs */
- if (privileged()) {
- if ((page_head == page_tail) && (head == tail) && (dead_cycles == 0)) {
- return true;
- }
- back_input(); /* we will try to end again after ejecting residual material */
- tail_append(new_null_box());
- width(tail) = hsize_par;
- tail_append(new_glue(fill_glue));
- tail_append(new_penalty(-010000000000,final_penalty));
- normal_page_filter(end);
- build_page(); /* append \.{\\hbox to \\hsize\{\}\\vfill\\penalty-'10000000000} */
- }
- return false;
-}
-
-/*tex
-
-The |hskip| and |vskip| command codes are used for control sequences like
-\.{\\hss} and \.{\\vfil} as well as for \.{\\hskip} and \.{\\vskip}. The
-difference is in the value of |cur_chr|.
-
-All the work relating to glue creation has been relegated to the following
-subroutine. It does not call |build_page|, because it is used in at least one
-place where that would be a mistake.
-
-*/
-
-void append_glue(void)
-{
- int s = cur_chr;
- switch (s) {
- case fil_code:
- cur_val = new_glue(fil_glue);
- break;
- case fill_code:
- cur_val = new_glue(fill_glue);
- break;
- case ss_code:
- cur_val = new_glue(ss_glue);
- break;
- case fil_neg_code:
- cur_val = new_glue(fil_neg_glue);
- break;
- case skip_code:
- scan_glue(glue_val_level);
- break;
- case mskip_code:
- scan_glue(mu_val_level);
- break;
- }
- /* now |cur_val| points to the glue specification */
- tail_append(new_glue(cur_val));
- flush_node(cur_val);
- if (s > skip_code) {
- subtype(tail) = mu_glue;
- }
-}
-
-void append_kern(void)
-{
- int s = cur_chr; /* |subtype| of the kern node */
- scan_dimen((s == mu_glue), false, false);
- tail_append(new_kern(cur_val));
- subtype(tail) = (quarterword) s;
-}
-
-/*tex
-
-We have to deal with errors in which braces and such things are not properly
-nested. Sometimes the user makes an error of commission by inserting an extra
-symbol, but sometimes the user makes an error of omission. \TeX\ can't always
-tell one from the other, so it makes a guess and tries to avoid getting into a
-loop.
-
-The |off_save| routine is called when the current group code is wrong. It tries
-to insert something into the user's input that will help clean off the top level.
-
-*/
-
-void off_save(void)
-{
- halfword p, q;
- if (cur_group == bottom_level) {
- /*tex Drop current token and complain that it was unmatched */
- print_err("Extra ");
- print_cmd_chr((quarterword) cur_cmd, cur_chr);
- help1(
- "Things are pretty mixed up, but I think the worst is over."
- );
- error();
-
- } else {
- back_input();
- p = get_avail();
- set_token_link(temp_token_head, p);
- print_err("Missing ");
- /*tex
- Prepare to insert a token that matches |cur_group|, and print what it
- is. At this point, |link(temp_token_head)=p|, a pointer to an empty
- one-word node.
- */
- switch (cur_group) {
- case semi_simple_group:
- set_token_info(p, cs_token_flag + frozen_end_group);
- tprint_esc("endgroup");
- break;
- case math_shift_group:
- set_token_info(p, math_shift_token + '$');
- print_char('$');
- break;
- case math_left_group:
- set_token_info(p, cs_token_flag + frozen_right);
- q = get_avail();
- set_token_link(p, q);
- p = token_link(p);
- set_token_info(p, other_token + '.');
- tprint_esc("right.");
- break;
- default:
- set_token_info(p, right_brace_token + '}');
- print_char('}');
- break;
- }
- tprint(" inserted");
- ins_list(token_link(temp_token_head));
- help5(
- "I've inserted something that you may have forgotten.",
- "(See the <inserted text> above.)",
- "With luck, this will get me unwedged. But if you",
- "really didn't forget anything, try typing `2' now; then",
- "my insertion and my current dilemma will both disappear."
- );
- error();
- }
-}
-/*tex
-
-The routine for a |right_brace| character branches into many subcases, since a
-variety of things may happen, depending on |cur_group|. Some types of groups are
-not supposed to be ended by a right brace; error messages are given in hopes of
-pinpointing the problem. Most branches of this routine will be filled in later,
-when we are ready to understand them; meanwhile, we must prepare ourselves to
-deal with such errors.
-
-*/
-
-void handle_right_brace(void)
-{
- halfword p, q; /* for short-term use */
- scaled d; /* holds |split_max_depth| in |insert_group| */
- int f; /* holds |floating_penalty| in |insert_group| */
- p = null;
- switch (cur_group) {
- case simple_group:
- fixup_directions();
- break;
- case bottom_level:
- print_err("Too many }'s");
- help2(
- "You've closed more groups than you opened.",
- "Such booboos are generally harmless, so keep going."
- );
- error();
- break;
- case semi_simple_group:
- case math_shift_group:
- case math_left_group:
- extra_right_brace();
- break;
- /*tex
- When the right brace occurs at the end of an \.{\\hbox} or
- \.{\\vbox} or \.{\\vtop} construction, the |package| routine
- comes into action. We might also have to finish a paragraph that
- hasn't ended.
- */
- case hbox_group:
- if (fixup_boxes_par) {
- /*tex
- This is unofficial! Fixing up (also elsewhere) might become default
- some day but for a while I will test this in ConTeXt.
- */
- fixup_directions_only();
- }
- package(0);
- break;
- case adjusted_hbox_group:
- adjust_tail = adjust_head;
- pre_adjust_tail = pre_adjust_head;
- package(0);
- break;
- case vbox_group:
- end_graf(vbox_group);
- package(0);
- break;
- case vtop_group:
- end_graf(vtop_group);
- package(vtop_code);
- break;
- case insert_group:
- end_graf(insert_group);
- q = new_glue(split_top_skip_par);
- d = split_max_depth_par;
- f = floating_penalty_par;
- unsave();
- save_ptr--;
- /*tex
- Now |saved_value(0)| is the insertion number, or the |vadjust| subtype.
- */
- p = vpack(vlink(head), 0, additional, -1);
- pop_nest();
- if (saved_type(0) == saved_insert) {
- tail_append(new_node(ins_node, saved_value(0)));
- height(tail) = height(p) + depth(p);
- ins_ptr(tail) = list_ptr(p);
- split_top_ptr(tail) = q;
- depth(tail) = d;
- float_cost(tail) = f;
- } else if (saved_type(0) == saved_adjust) {
- tail_append(new_node(adjust_node, saved_value(0)));
- adjust_ptr(tail) = list_ptr(p);
- flush_node(q);
- } else {
- confusion("insert_group");
- }
- list_ptr(p) = null;
- flush_node(p);
- if (nest_ptr == 0) {
- checked_page_filter(insert);
- build_page();
- }
- break;
- case output_group:
- /*tex
- this is needed in case the \.{\\output} executes a \.{\\textdir} command.
- */
- if (dir_level(text_dir_ptr) == cur_level) {
- /*tex Remove from |text_dir_ptr| */
- halfword text_dir_tmp = vlink(text_dir_ptr);
- flush_node(text_dir_ptr);
- text_dir_ptr = text_dir_tmp;
- }
- resume_after_output();
- break;
- case disc_group:
- build_discretionary();
- break;
- case local_box_group:
- build_local_box();
- break;
- case align_group:
- back_input();
- cur_tok = cs_token_flag + frozen_cr;
- print_err("Missing \\cr inserted");
- help1(
- "I'm guessing that you meant to end an alignment here."
- );
- ins_error();
- break;
- case no_align_group:
- end_graf(no_align_group);
- unsave();
- align_peek();
- break;
- case vcenter_group:
- end_graf(vcenter_group);
- finish_vcenter();
- break;
- case math_choice_group:
- build_choices();
- break;
- case math_group:
- close_math_group(p);
- break;
- default:
- confusion("rightbrace");
- break;
- }
-}
-
-void extra_right_brace(void)
-{
- print_err("Extra }, or forgotten ");
- switch (cur_group) {
- case semi_simple_group:
- tprint_esc("endgroup");
- break;
- case math_shift_group:
- print_char('$');
- break;
- case math_left_group:
- tprint_esc("right");
- break;
- }
- help5(
- "I've deleted a group-closing symbol because it seems to be",
- "spurious, as in `$x}$'. But perhaps the } is legitimate and",
- "you forgot something else, as in `\\hbox{$x}'. In such cases",
- "the way to recover is to insert both the forgotten and the",
- "deleted material, e.g., by typing `I$}'."
- );
- error();
- incr(align_state);
-}
-
-/*tex
-
-Here is where we clear the parameters that are supposed to revert to their
-default values after every paragraph and when internal vertical mode is entered.
-
-*/
-
-void normal_paragraph(void)
-{
- if (looseness_par != 0)
- eq_word_define(int_base + looseness_code, 0);
- if (hang_indent_par != 0)
- eq_word_define(dimen_base + hang_indent_code, 0);
- if (hang_after_par != 1)
- eq_word_define(int_base + hang_after_code, 1);
- if (par_shape_par_ptr != null)
- eq_define(par_shape_loc, shape_ref_cmd, null);
- if (inter_line_penalties_par_ptr != null)
- eq_define(inter_line_penalties_loc, shape_ref_cmd, null);
- if (shape_mode_par > 0)
- eq_word_define(dimen_base + shape_mode_code, 0);
-}
-
-/*tex
-
-The global variable |cur_box| will point to a newly-made box. If the box is void,
-we will have |cur_box=null|. Otherwise we will have |type(cur_box)=hlist_node| or
-|vlist_node| or |rule_node|; the |rule_node| case can occur only with leaders.
-
-*/
-
-halfword cur_box; /* box to be placed into its context */
-
-/*tex
-
-The |box_end| procedure does the right thing with |cur_box|, if |box_context|
-represents the context as explained above.
-
-*/
-
-void box_end(int box_context)
-{
- if (box_context < box_flag) {
- /*tex
-
- Append box |cur_box| to the current list, shifted by |box_context|.
- The global variable |adjust_tail| will be non-null if and only if the
- current box might include adjustments that should be appended to the
- current vertical list.
-
- */
-
- if (cur_box != null) {
- shift_amount(cur_box) = box_context;
- if (abs(mode) == vmode) {
- if (pre_adjust_tail != null) {
- if (pre_adjust_head != pre_adjust_tail)
- append_list(pre_adjust_head, pre_adjust_tail);
- pre_adjust_tail = null;
- }
- append_to_vlist(cur_box,lua_key_index(box));
- if (adjust_tail != null) {
- if (adjust_head != adjust_tail)
- append_list(adjust_head, adjust_tail);
- adjust_tail = null;
- }
- if (mode > 0) {
- checked_page_filter(box);
- build_page();
- }
- } else {
- if (abs(mode) == hmode)
- space_factor_par = 1000;
- else
- cur_box = new_sub_box(cur_box);
- couple_nodes(tail, cur_box);
- tail = cur_box;
- }
- }
- } else if (box_context < ship_out_flag) {
- /*tex
- Store |cur_box| in a box register
- */
- if (box_context < global_box_flag)
- eq_define(box_base + box_context - box_flag, box_ref_cmd, cur_box);
- else
- geq_define(box_base + box_context - global_box_flag, box_ref_cmd, cur_box);
- } else if (box_context == lua_scan_flag) {
- /*tex
- We are done with scanning so let's return to the caller.
- */
- wrapup_local_scan_box();
- } else if (cur_box != null) {
- /*tex
- The leaders contexts come after shipout and luascan contexts.
- */
- /* if (box_context > lua_scan_flag) { */
- if (box_context >= leader_flag) {
- /*tex
- Append a new leader node that uses |cur_box| and get the next
- non-blank non-relax...
- */
- do {
- get_x_token();
- } while ((cur_cmd == spacer_cmd) || (cur_cmd == relax_cmd));
- if (((cur_cmd == hskip_cmd) && (abs(mode) != vmode)) ||
- ((cur_cmd == vskip_cmd) && (abs(mode) == vmode))) {
- append_glue();
- subtype(tail) = (quarterword) (box_context - (leader_flag - a_leaders));
- leader_ptr(tail) = cur_box;
- } else {
- print_err("Leaders not followed by proper glue");
- help3(
- "You should say `\\leaders <box or rule><hskip or vskip>'.",
- "I found the <box or rule>, but there's no suitable",
- "<hskip or vskip>, so I'm ignoring these leaders."
- );
- back_error();
- flush_node_list(cur_box);
- }
- } else {
- if (box_context != ship_out_flag) {
- normal_error("scanner","shipout expected");
- }
- ship_out(static_pdf, cur_box, SHIPPING_PAGE);
- }
- }
-}
-
-/*tex
-
-the next input should specify a box or perhaps a rule
-
-*/
-
-void scan_box(int box_context)
-{
- /*tex Get the next non-blank non-relax... */
- do {
- get_x_token();
- } while ((cur_cmd == spacer_cmd) || (cur_cmd == relax_cmd));
- if (cur_cmd == make_box_cmd) {
- begin_box(box_context);
- } else if ((box_context >= leader_flag) &&
- ((cur_cmd == hrule_cmd) || (cur_cmd == vrule_cmd) ||
- (cur_cmd == no_hrule_cmd) || (cur_cmd == no_vrule_cmd))) {
- cur_box = scan_rule_spec();
- box_end(box_context);
- } else {
- print_err("A <box> was supposed to be here");
- help3(
- "I was expecting to see \\hbox or \\vbox or \\copy or \\box or",
- "something like that. So you might find something missing in",
- "your output. But keep trying; you can fix this later."
- );
- back_error();
- if (box_context == lua_scan_flag) {
- cur_box = null;
- box_end(box_context);
- }
- }
-}
-
-void new_graf(boolean indented)
-{
- halfword p, q, dir_graf_tmp;
- halfword dir_rover;
- int callback_id;
- if ((mode == vmode) || (head != tail)) {
- tail_append(new_param_glue(par_skip_code));
- }
- callback_id = callback_defined(new_graf_callback);
- if (callback_id > 0) {
- run_callback(callback_id, "db->b", cur_list.mode_field,indented,&indented);
- }
- prev_graf_par = 0;
- push_nest();
- mode = hmode;
- space_factor_par = 1000;
- /*tex Add local paragraph node */
- tail_append(make_local_par_node(new_graf_par_code));
- if (indented) {
- p = new_null_box();
- box_dir(p) = par_direction_par;
- width(p) = par_indent_par;
- subtype(p) = indent_list;
- q = tail;
- tail_append(p);
- } else {
- q = tail;
- }
- dir_rover = text_dir_ptr;
- while (dir_rover != null) {
- if ((vlink(dir_rover) != null) || (dir_dir(dir_rover) != par_direction_par)) {
- dir_graf_tmp = new_dir(dir_dir(dir_rover));
- try_couple_nodes(dir_graf_tmp,vlink(q));
- couple_nodes(q,dir_graf_tmp);
- }
- dir_rover = vlink(dir_rover);
- }
- q = head;
- while (vlink(q) != null)
- q = vlink(q);
- tail = q;
- if (every_par_par != null)
- begin_token_list(every_par_par, every_par_text);
- if (nest_ptr == 1) {
- checked_page_filter(new_graf);
- /*tex put |par_skip| glue on current page */
- build_page();
- }
-}
-
-void indent_in_hmode(void)
-{
- halfword p;
- if (cur_chr > 0) {
- /*tex \.{\\indent} */
- p = new_null_box();
- width(p) = par_indent_par;
- if (abs(mode) == hmode)
- space_factor_par = 1000;
- else
- p = new_sub_box(p);
- tail_append(p);
- }
-}
-
-void head_for_vmode(void)
-{
- if (mode < 0) {
- if ((cur_cmd != hrule_cmd) && (cur_cmd != no_hrule_cmd)) {
- off_save();
- } else {
- print_err("You can't use `\\hrule' here except with leaders");
- help2(
- "To put a horizontal rule in an hbox or an alignment,",
- "you should use \\leaders or \\hrulefill (see The TeXbook)."
- );
- error();
- }
- } else {
- back_input();
- cur_tok = par_token;
- back_input();
- token_type = inserted;
- }
-}
-
-/*tex
-
-|dir_save| would have been set by |line_break| by means of |post_line_break|, but
-this is not done right now, as it introduces pretty heavy memory leaks. This
-means the current code might be wrong in some way that relates to in-paragraph
-displays.
-
-*/
-
-void end_graf(int line_break_context)
-{
- if (mode == hmode) {
- if ((head == tail) || (vlink(head) == tail)) {
- if (vlink(head) == tail)
- flush_node(vlink(head));
- /*tex |null| paragraphs are ignored, all contain a |local_paragraph| node */
- pop_nest();
- } else {
- line_break(false, line_break_context);
- }
- if (dir_save != null) {
- flush_node_list(dir_save);
- dir_save = null;
- }
- normal_paragraph();
- error_count = 0;
- }
-}
-
-void begin_insert_or_adjust(void)
-{
- if (cur_cmd != vadjust_cmd) {
- scan_register_num();
- if (cur_val == output_box_par) {
- print_err("You can't \\insert");
- print_int(output_box_par);
- help1(
- "I'm changing to \\insert0; box \\outputbox is special."
- );
- error();
- cur_val = 0;
- }
- set_saved_record(0, saved_insert, 0, cur_val);
- } else if (scan_keyword("pre")) {
- set_saved_record(0, saved_adjust, 0, 1);
- } else {
- set_saved_record(0, saved_adjust, 0, 0);
- }
- save_ptr++;
- new_save_level(insert_group);
- scan_left_brace();
- normal_paragraph();
- push_nest();
- mode = -vmode;
- prev_depth_par = ignore_depth;
-}
-
-/*tex
-
-I (TH)'ve renamed the |make_mark| procedure to this, because if the current chr
-code is 1, then the actual command was \.{\\clearmarks}, which does not generate
-a mark node but instead destroys the current mark tokenlists.
-
-*/
-
-void handle_mark(void)
-{
- halfword p; /* new node */
- halfword c; /* the mark class */
- if (cur_chr == clear_marks_code) {
- scan_mark_num();
- c = cur_val;
- delete_top_mark(c);
- delete_bot_mark(c);
- delete_first_mark(c);
- delete_split_first_mark(c);
- delete_split_bot_mark(c);
- } else {
- if (cur_chr == 0) {
- c = 0;
- } else {
- scan_mark_num();
- c = cur_val;
- if (c > biggest_used_mark)
- biggest_used_mark = c;
- }
- p = scan_toks(false, true);
- p = new_node(mark_node, 0); /* the |subtype| is not used */
- mark_class(p) = c;
- mark_ptr(p) = def_ref;
- couple_nodes(tail, p);
- tail = p;
- }
-}
-
-void append_penalty(void)
-{
- scan_int();
- tail_append(new_penalty(cur_val,user_penalty));
- if (mode == vmode) {
- checked_page_filter(penalty);
- build_page();
- }
-}
-
-/*tex
-
-When |delete_last| is called, |cur_chr| is the |type| of node that will be
-deleted, if present.
-
-The |remove_item| command removes a penalty, kern, or glue node if it appears at
-the tail of the current list, using a brute-force linear scan. Like
-\.{\\lastbox}, this command is not allowed in vertical mode (except internal
-vertical mode), since the current list in vertical mode is sent to the page
-builder. But if we happen to be able to implement it in vertical mode, we do.
-
-*/
-
-void delete_last(void)
-{
- halfword p, q; /* run through the current list */
- if ((mode == vmode) && (tail == head)) {
- /*tex
- Apologize for inability to do the operation now, unless \.{\\unskip}
- follows non-glue
- */
- if ((cur_chr != glue_node) || (last_glue != max_halfword)) {
- you_cant();
- if (cur_chr == kern_node) {
- help2(
- "Sorry...I usually can't take things from the current page.",
- "Try `I\\kern-\\lastkern' instead."
- );
- } else if (cur_chr != glue_node) {
- help2
- ("Sorry...I usually can't take things from the current page.",
- "Perhaps you can make the output routine do it.");
- } else {
- help2
- ("Sorry...I usually can't take things from the current page.",
- "Try `I\\vskip-\\lastskip' instead.");
- }
- error();
- }
- } else {
- /*tex Todo: clean this up! */
- if (!is_char_node(tail)) {
- if (type(tail) == cur_chr) {
- q = head;
- do {
- p = q;
- if (!is_char_node(q)) {
- if (type(q) == disc_node) {
- if (p == tail)
- return;
- }
- }
- q = vlink(p);
- } while (q != tail);
- vlink(p) = null;
- flush_node_list(tail);
- tail = p;
- }
- }
- }
-}
-
-void unpackage(void)
-{
- halfword p; /* the box */
- halfword r; /* to remove marginal kern nodes */
- int c; /* should we copy? */
- halfword s; /* for varmem assignment */
- if (cur_chr > copy_code) {
- /*tex Handle saved items and |goto done| */
- try_couple_nodes(tail, disc_ptr[cur_chr]);
- disc_ptr[cur_chr] = null;
- goto DONE;
- }
- c = cur_chr;
- scan_register_num();
- p = box(cur_val);
- if (p == null)
- return;
- if ((abs(mode) == mmode)
- || ((abs(mode) == vmode) && (type(p) != vlist_node))
- || ((abs(mode) == hmode) && (type(p) != hlist_node))) {
- print_err("Incompatible list can't be unboxed");
- help3(
- "Sorry, Pandora. (You sneaky devil.)",
- "I refuse to unbox an \\hbox in vertical mode or vice versa.",
- "And I can't open any boxes in math mode."
- );
- error();
- return;
- }
- if (c == copy_code) {
- s = copy_node_list(list_ptr(p));
- try_couple_nodes(tail,s);
- } else {
- try_couple_nodes(tail,list_ptr(p));
- box(cur_val) = null;
- list_ptr(p) = null;
- flush_node(p);
- }
- DONE:
- while (vlink(tail) != null) {
- r = vlink(tail);
- if (!is_char_node(r) && (type(r) == margin_kern_node)) {
- try_couple_nodes(tail,vlink(r));
- flush_node(r);
- }
- tail = vlink(tail);
- }
-}
-
-/*tex
-
-Italic corrections are converted to kern nodes when the |ital_corr| command
-follows a character. In math mode the same effect is achieved by appending a kern
-of zero here, since italic corrections are supplied later.
-
-*/
-
-void append_italic_correction(void)
-{
- halfword p; /* |char_node| at the tail of the current list */
- internal_font_number f; /* the font in the |char_node| */
- if (tail != head) {
- if (is_char_node(tail))
- p = tail;
- else
- return;
- f = font(p);
- tail_append(new_kern(char_italic(f, character(p))));
- subtype(tail) = italic_kern;
- }
-}
-
-void append_local_box(int kind)
-{
- incr(save_ptr);
- set_saved_record(-1, saved_boxtype, 0, kind);
- new_save_level(local_box_group);
- scan_left_brace();
- push_nest();
- mode = -hmode;
- space_factor_par = 1000;
-}
-
-/*tex
-
-Discretionary nodes are easy in the common case `\.{\\-}', but in the general
-case we must process three braces full of items.
-
-The space factor does not change when we append a discretionary node, but it
-starts out as 1000 in the subsidiary lists.
-
-*/
-
-void append_discretionary(void)
-{
- int c;
- tail_append(new_disc());
- subtype(tail) = (quarterword) cur_chr;
- if (cur_chr == explicit_disc) {
- /* |\-| */
- c = get_pre_hyphen_char(cur_lang_par);
- if (c > 0) {
- vlink(pre_break(tail)) = new_char(equiv(cur_font_loc), c);
- alink(vlink(pre_break(tail))) = pre_break(tail);
- tlink(pre_break(tail)) = vlink(pre_break(tail));
- }
- c = get_post_hyphen_char(cur_lang_par);
- if (c > 0) {
- vlink(post_break(tail)) = new_char(equiv(cur_font_loc), c);
- alink(vlink(post_break(tail))) = post_break(tail);
- tlink(post_break(tail)) = vlink(post_break(tail));
- }
- set_explicit_disc_penalty(tail);
- } else if (cur_chr == automatic_disc) {
- /*tex As done in hyphenator: */
- c = get_pre_exhyphen_char(cur_lang_par);
- if (c <= 0) {
- c = ex_hyphen_char_par;
- }
- if (c > 0) {
- vlink(pre_break(tail)) = new_char(equiv(cur_font_loc), c);
- alink(vlink(pre_break(tail))) = pre_break(tail);
- tlink(pre_break(tail)) = vlink(pre_break(tail));
- }
- c = get_post_exhyphen_char(cur_lang_par);
- if (c > 0) {
- vlink(post_break(tail)) = new_char(equiv(cur_font_loc), c);
- alink(vlink(post_break(tail))) = post_break(tail);
- tlink(post_break(tail)) = vlink(post_break(tail));
- }
- c = ex_hyphen_char_par;
- if (c > 0) {
- vlink(no_break(tail)) = new_char(equiv(cur_font_loc), c);
- alink(vlink(no_break(tail))) = no_break(tail);
- tlink(no_break(tail)) = vlink(no_break(tail));
- }
- set_automatic_disc_penalty(tail);
- } else {
- /*tex |\discretionary| */
- if (scan_keyword("penalty")) {
- scan_int();
- disc_penalty(tail) = cur_val;
- }
- incr(save_ptr);
- set_saved_record(-1, saved_disc, 0, 0);
- new_save_level(disc_group);
- scan_left_brace();
- push_nest();
- mode = -hmode;
- space_factor_par = 1000;
- /*tex Already preset: |disc_penalty(tail) = hyphen_penalty_par;| */
- }
-}
-
-/*tex
-
-The test for |p != null| ensures that empty \.{\\localleftbox} and
-\.{\\localrightbox} commands are not applied.
-
-*/
-
-void build_local_box(void)
-{
- halfword p;
- int kind;
- unsave();
- assert(saved_type(-1) == saved_boxtype);
- kind = saved_value(-1);
- decr(save_ptr);
- p = vlink(head);
- pop_nest();
- if (p != null) {
- /*tex
- Somehow |filtered_hpack| goes beyond the first node so we loose it.
- */
- /*tex
- There is no need for |new_hyphenation(p, null);| here as we're in
- an |\hbox|.
- */
- (void) new_ligkern(p, null);
- p = lua_hpack_filter(p, 0, additional, local_box_group, -1, null);
- /*tex
- We really need something packed so we play safe! This feature is inherited
- but could have been delegated to a callback anyway.
- */
- p = hpack(p, 0, additional, -1);
- }
- if (kind == 0)
- eq_define(local_left_box_base, box_ref_cmd, p);
- else
- eq_define(local_right_box_base, box_ref_cmd, p);
- if (abs(mode) == hmode) {
- /*tex Add local paragraph node */
- tail_append(make_local_par_node(local_box_par_code));
- }
- eq_word_define(int_base + no_local_whatsits_code, no_local_whatsits_par + 1);
-}
-
-/*tex
-
-The three discretionary lists are constructed somewhat as if they were hboxes.
-A~subroutine called |build_discretionary| handles the transitions. (This is sort
-of fun.)
-
-*/
-
-void build_discretionary(void)
-{
- halfword p, q; /* for link manipulation */
- int n; /* length of discretionary list */
- unsave();
- /*tex
- Prune the current list, if necessary, until it contains only |char_node|,
- |kern_node|, |hlist_node|, |vlist_node| and |rule_node| items; set |n| to
- the length of the list, and set |q| to the lists tail. During this loop,
- |p=vlink(q)| and there are |n| items preceding |p|.
- */
- q = head;
- p = vlink(q);
- n = 0;
- while (p != null) {
- if (!is_char_node(p) && type(p) > rule_node && type(p) != kern_node) {
- print_err("Improper discretionary list");
- help1(
- "Discretionary lists must contain only boxes and kerns."
- );
- error();
- begin_diagnostic();
- tprint_nl("The following discretionary sublist has been deleted:");
- show_box(p);
- end_diagnostic(true);
- flush_node_list(p);
- vlink(q) = null;
- break;
- }
- alink(p) = q;
- q = p;
- p = vlink(q);
- incr(n);
- }
-
- p = vlink(head);
- pop_nest();
- assert(saved_type(-1) == saved_disc);
- switch (saved_value(-1)) {
- case 0:
- if (n > 0) {
- vlink(pre_break(tail)) = p;
- alink(p) = pre_break(tail);
- tlink(pre_break(tail)) = q;
- }
- break;
- case 1:
- if (n > 0) {
- vlink(post_break(tail)) = p;
- alink(p) = post_break(tail);
- tlink(post_break(tail)) = q;
- }
- break;
- case 2:
- /*tex
- Attach list |p| to the current list, and record its length; then
- finish up and |return|
- */
- if ((n > 0) && (abs(mode) == mmode)) {
- print_err("Illegal math \\discretionary");
- help2(
- "Sorry: The third part of a discretionary break must be",
- "empty, in math formulas. I had to delete your third part."
- );
- flush_node_list(p);
- error();
- } else {
- if (n > 0) {
- vlink(no_break(tail)) = p;
- alink(p) = no_break(tail);
- tlink(no_break(tail)) = q;
- }
- }
- decr(save_ptr);
- /*tex There are no other cases. */
- return;
- break;
- }
- set_saved_record(-1, saved_disc, 0, (saved_value(-1) + 1));
- new_save_level(disc_group);
- scan_left_brace();
- push_nest();
- mode = -hmode;
- space_factor_par = 1000;
-}
-
-/*tex
-
-The positioning of accents is straightforward but tedious. Given an accent of
-width |a|, designed for characters of height |x| and slant |s|; and given a
-character of width |w|, height |h|, and slant |t|: We will shift the accent down
-by |x-h|, and we will insert kern nodes that have the effect of centering the
-accent over the character and shifting the accent to the right by
-$\delta={1\over2}(w-a)+h\cdot t-x\cdot s$. If either character is absent from the
-font, we will simply use the other, without shifting.
-
-*/
-
-void make_accent(void)
-{
- double s, t; /* amount of slant */
- halfword p, q, r; /* character, box, and kern nodes */
- internal_font_number f; /* relevant font */
- scaled a, h, x, w, delta; /* heights and widths, as explained above */
- scan_char_num();
- f = equiv(cur_font_loc);
- p = new_glyph(f, cur_val);
- if (p != null) {
- x = x_height(f);
- /*tex real division */
- s = float_cast(slant(f)) / float_constant(65536);
- a = glyph_width(p);
- do_assignments();
- /*tex
- Create a character node |q| for the next character, but set |q:=null|
- if problems arise
- */
- q = null;
- f = equiv(cur_font_loc);
- if ((cur_cmd == letter_cmd) ||
- (cur_cmd == other_char_cmd) || (cur_cmd == char_given_cmd)) {
- q = new_glyph(f, cur_chr);
- } else if (cur_cmd == char_num_cmd) {
- scan_char_num();
- q = new_glyph(f, cur_val);
- } else {
- back_input();
- }
-
- if (q != null) {
- /*tex
- Append the accent with appropriate kerns, then set |p:=q|. The
- kern nodes appended here must be distinguished from other kerns,
- lest they be wiped away by the hyphenation algorithm or by a
- previous line break. The two kerns are computed with
- (machine-dependent) |real| arithmetic, but their sum is
- machine-independent; the net effect is machine-independent,
- because the user cannot remove these nodes nor access them via
- \.{\\lastkern}.
- */
- t = float_cast(slant(f)) / float_constant(65536); /* real division */
- w = glyph_width(q);
- h = glyph_height(q);
- if (h != x) {
- /*tex the accent must be shifted up or down */
- p = hpack(p, 0, additional, -1);
- shift_amount(p) = x - h;
- }
- /*tex real multiplication */
- delta = round(float_cast(w - a) / float_constant(2) + h * t - x * s);
- r = new_kern(delta);
- subtype(r) = accent_kern;
- couple_nodes(tail, r);
- couple_nodes(r, p);
- tail = new_kern(-a - delta);
- subtype(tail) = accent_kern;
- couple_nodes(p, tail);
- p = q;
-
- }
- couple_nodes(tail, p);
- tail = p;
- space_factor_par = 1000;
- }
-}
-
-/*tex
-
-When `\.{\\cr}' or `\.{\\span}' or a tab mark comes through the scanner into
-|main_control|, it might be that the user has foolishly inserted one of them into
-something that has nothing to do with alignment. But it is far more likely that a
-left brace or right brace has been omitted, since |get_next| takes actions
-appropriate to alignment only when `\.{\\cr}' or `\.{\\span}' or tab marks occur
-with |align_state=0|. The following program attempts to make an appropriate
-recovery.
-
-*/
-
-void align_error(void)
-{
- if (abs(align_state) > 2) {
- /*tex
- Express consternation over the fact that no alignment is in progress.
- */
- print_err("Misplaced ");
- print_cmd_chr((quarterword) cur_cmd, cur_chr);
- if (cur_tok == tab_token + '&') {
- help6(
- "I can't figure out why you would want to use a tab mark",
- "here. If you just want an ampersand, the remedy is",
- "simple: Just type `I\\&' now. But if some right brace",
- "up above has ended a previous alignment prematurely,",
- "you're probably due for more error messages, and you",
- "might try typing `S' now just to see what is salvageable."
- );
- } else {
- help5(
- "I can't figure out why you would want to use a tab mark",
- "or \\cr or \\span just now. If something like a right brace",
- "up above has ended a previous alignment prematurely,",
- "you're probably due for more error messages, and you",
- "might try typing `S' now just to see what is salvageable."
- );
- }
- error();
-
- } else {
- back_input();
- if (align_state < 0) {
- print_err("Missing { inserted");
- incr(align_state);
- cur_tok = left_brace_token + '{';
- } else {
- print_err("Missing } inserted");
- decr(align_state);
- cur_tok = right_brace_token + '}';
- }
- help3(
- "I've put in what seems to be necessary to fix",
- "the current column of the current alignment.",
- "Try to go on, since this might almost work."
- );
- ins_error();
- }
-}
-
-/*tex
-
-The help messages here contain a little white lie, since \.{\\noalign} and
-\.{\\omit} are allowed also after `\.{\\noalign\{...\}}'.
-
-*/
-
-void no_align_error(void)
-{
- print_err("Misplaced \\noalign");
- help2(
- "I expect to see \\noalign only after the \\cr of",
- "an alignment. Proceed, and I'll ignore this case."
- );
- error();
-}
-
-void omit_error(void)
-{
- print_err("Misplaced \\omit");
- help2(
- "I expect to see \\omit only after tab marks or the \\cr of",
- "an alignment. Proceed, and I'll ignore this case."
- );
- error();
-}
-
-/*tex
-
-We've now covered most of the abuses of \.{\\halign} and \.{\\valign}. Let's take
-a look at what happens when they are used correctly.
-
-An |align_group| code is supposed to remain on the |save_stack| during an entire
-alignment, until |fin_align| removes it.
-
-A devious user might force an |endv| command to occur just about anywhere; we
-must defeat such hacks.
-
-*/
-
-void do_endv(void)
-{
- base_ptr = input_ptr;
- input_stack[base_ptr] = cur_input;
- while ((input_stack[base_ptr].index_field != v_template) &&
- (input_stack[base_ptr].loc_field == null) &&
- (input_stack[base_ptr].state_field == token_list))
- decr(base_ptr);
- if ((input_stack[base_ptr].index_field != v_template) ||
- (input_stack[base_ptr].loc_field != null) ||
- (input_stack[base_ptr].state_field != token_list))
- fatal_error("(interwoven alignment preambles are not allowed)");
- /*tex interwoven alignment preambles... */
- if (cur_group == align_group) {
- end_graf(align_group);
- if (fin_col())
- fin_row();
- } else {
- off_save();
- }
-}
-
-/*tex
-
-Finally, \.{\\endcsname} is not supposed to get through to |main_control|.
-
-*/
-
-void cs_error(void)
-{
- print_err("Extra \\endcsname");
- help1(
- "I'm ignoring this, since I wasn't doing a \\csname."
- );
- error();
-}
-
-/*tex
-
-Assignments to values in |eqtb| can be global or local. Furthermore, a control
-sequence can be defined to be `\.{\\long}', `\.{\\protected}', or `\.{\\outer}',
-and it might or might not be expanded. The prefixes `\.{\\global}', `\.{\\long}',
-`\.{\\protected}', and `\.{\\outer}' can occur in any order. Therefore we assign
-binary numeric codes, making it possible to accumulate the union of all specified
-prefixes by adding the corresponding codes. (PASCAL's |set| operations could also
-have been used.)
-
-Every prefix, and every command code that might or might not be prefixed, calls
-the action procedure |prefixed_command|. This routine accumulates a sequence of
-prefixes until coming to a non-prefix, then it carries out the command.
-
-*/
-
-/*tex
-
-If the user says, e.g., `\.{\\global\\global}', the redundancy is silently
-accepted. The different types of code values have different legal ranges; the
-following program is careful to check each case properly.
-
-*/
-
-#define check_def_code(A) do { \
- if (((cur_val<0)&&(p<(A)))||(cur_val>n)) { \
- print_err("Invalid code ("); \
- print_int(cur_val); \
- if (p<(A)) \
- tprint("), should be in the range 0.."); \
- else \
- tprint("), should be at most "); \
- print_int(n); \
- help1( \
- "I'm going to use 0 instead of that illegal code value." \
- ); \
- error(); \
- cur_val=0; \
- } \
-} while (0)
-
-/*
-halfword swap_hang_indent(halfword indentation, halfword shape_mode) {
- if (shape_mode == 1 || shape_mode == 3 || shape_mode == -1 || shape_mode == -3) {
- return negate(indentation);
- } else {
- return indentation;
- }
-}
-
-halfword swap_parshape_indent(halfword indentation, halfword width, halfword shape_mode) {
- if (shape_mode == 2 || shape_mode == 3 || shape_mode == -2 || shape_mode == -3) {
- return hsize_par - width - indentation;
- } else {
- return indentation;
- }
-}
-
-*/
-
-void prefixed_command(void)
-{
- int a; /* accumulated prefix codes so far */
- internal_font_number f; /* identifies a font */
- halfword j; /* index into a \.{\\parshape} specification */
- halfword p, q; /* for temporary short-term use */
- int n; /* ditto */
- boolean e, check_glue; /* should a definition be expanded? or was \.{\\let} not done? */
- mathcodeval mval; /* for handling of \.{\\mathchardef}s */
- a = 0;
- while (cur_cmd == prefix_cmd) {
- if (!odd(a / cur_chr))
- a = a + cur_chr;
- /*tex
- Get the next non-blank non-relax...
- */
- do {
- get_x_token();
- } while ((cur_cmd == spacer_cmd) || (cur_cmd == relax_cmd));
-
- if (cur_cmd <= max_non_prefixed_command) {
- /*tex
- Discard erroneous prefixes and |return|
- */
- print_err("You can't use a prefix with `");
- print_cmd_chr((quarterword) cur_cmd, cur_chr);
- print_char('\'');
- help2(
- "I'll pretend you didn't say \\long or \\outer or \\global or",
- "\\protected."
- );
- back_error();
- return;
- }
- if (tracing_commands_par > 2)
- show_cur_cmd_chr();
- }
- /*tex
- Discard the prefixes \.{\\long} and \.{\\outer} if they are irrelevant
- */
- if (a >= 8) {
- j = protected_token;
- a = a - 8;
- } else {
- j = 0;
- }
- if ((cur_cmd != def_cmd) && (cur_cmd != def_lua_call_cmd) && ((a % 4 != 0) || (j != 0))) {
- print_err("You can't use `\\long' or `\\outer' or `\\protected' with `");
- print_cmd_chr((quarterword) cur_cmd, cur_chr);
- print_char('\'');
- help1(
- "I'll pretend you didn't say \\long or \\outer or \\protected here."
- );
- error();
- }
- /*tex
- Adjust for the setting of \.{\\globaldefs}
- */
- if (global_defs_par != 0) {
- if (global_defs_par < 0) {
- if (is_global(a))
- a = a - 4;
- } else {
- if (!is_global(a))
- a = a + 4;
- }
- }
- switch (cur_cmd) {
- case set_font_cmd:
- /*tex
- Here's an example of the way many of the following routines operate.
- (Unfortunately, they aren't all as simple as this.)
- */
- define(cur_font_loc, data_cmd, cur_chr);
- break;
- case def_cmd:
- /*tex
- When a |def| command has been scanned, |cur_chr| is odd if the
- definition is supposed to be global, and |cur_chr>=2| if the
- definition is supposed to be expanded.
- */
- if (odd(cur_chr) && !is_global(a) && (global_defs_par >= 0))
- a = a + 4;
- e = (cur_chr >= 2);
- get_r_token();
- p = cur_cs;
- q = scan_toks(true, e);
- if (j != 0) {
- q = get_avail();
- set_token_info(q, j);
- set_token_link(q, token_link(def_ref));
- set_token_link(def_ref, q);
- }
- define(p, call_cmd + (a % 4), def_ref);
- break;
- case let_cmd:
- n = cur_chr;
- switch (n) {
- case 0:
- /*tex |glet| */
- if (!is_global(a) && (global_defs_par >= 0)) {
- a = a + 4;
- }
- case 1:
- /*tex |let| */
- get_r_token();
- p = cur_cs;
- do {
- get_token();
- } while (cur_cmd == spacer_cmd);
- if (cur_tok == other_token + '=') {
- get_token();
- if (cur_cmd == spacer_cmd)
- get_token();
- }
- break;
- case 2:
- /*tex |futurelet| */
- get_r_token();
- p = cur_cs;
- get_token();
- q = cur_tok;
- get_token();
- back_input();
- cur_tok = q;
- /*tex
- We look ahead and then back up. Note that |back_input| doesn't
- affect |cur_cmd|, |cur_chr|
- */
- back_input();
- break;
- case 3:
- /*tex |letcharcode| */
- scan_int();
- if (cur_val > 0) {
- /*tex HH: I need to do a more extensive test later. */
- p = active_to_cs(cur_val, true);
- do {
- get_token();
- } while (cur_cmd == spacer_cmd);
- if (cur_tok == other_token + '=') {
- get_token();
- if (cur_cmd == spacer_cmd)
- get_token();
- }
- } else {
- p = null;
- tex_error("invalid number for \\letcharcode",NULL);
- }
- break;
- default:
- /*tex We please the compiler. */
- p = null;
- confusion("let");
- break;
- }
- if (cur_cmd >= call_cmd)
- add_token_ref(cur_chr);
- define(p, cur_cmd, cur_chr);
- break;
- case shorthand_def_cmd:
- /*tex
- We temporarily define |p| to be |relax|, so that an occurrence of
- |p| while scanning the definition will simply stop the scanning
- instead of producing an ``undefined control sequence'' error or
- expanding the previous meaning. This allows, for instance,
- `\.{\\chardef\\foo=123\\foo}'.
- */
- n = cur_chr;
- get_r_token();
- p = cur_cs;
- define(p, relax_cmd, too_big_char);
- scan_optional_equals();
- switch (n) {
- case char_def_code:
- scan_char_num();
- define(p, char_given_cmd, cur_val);
- break;
- case math_char_def_code:
- mval = scan_mathchar(tex_mathcode);
- /* if (math_umathcode_meaning_par == 1) { */
- /* cur_val = (mval.class_value + (8 * mval.family_value)) * (65536 * 32) + mval.character_value; */
- /* define(p, xmath_given_cmd, cur_val); */
- /* } else { */
- cur_val = (mval.class_value * 16 + mval.family_value) * 256 + mval.character_value;
- define(p, math_given_cmd, cur_val);
- /* } */
- break;
- case xmath_char_def_code:
- mval = scan_mathchar(umath_mathcode);
- cur_val = (mval.class_value + (8 * mval.family_value)) * (65536 * 32) + mval.character_value;
- define(p, xmath_given_cmd, cur_val);
- break;
- case umath_char_def_code:
- mval = scan_mathchar(umathnum_mathcode);
- cur_val = (mval.class_value + (8 * mval.family_value)) * (65536 * 32) + mval.character_value;
- define(p, xmath_given_cmd, cur_val);
- break;
- default:
- scan_register_num();
- switch (n) {
- case count_def_code:
- define(p, assign_int_cmd, count_base + cur_val);
- break;
- case attribute_def_code:
- define(p, assign_attr_cmd, attribute_base + cur_val);
- break;
- case dimen_def_code:
- define(p, assign_dimen_cmd, scaled_base + cur_val);
- break;
- case skip_def_code:
- define(p, assign_glue_cmd, skip_base + cur_val);
- break;
- case mu_skip_def_code:
- define(p, assign_mu_glue_cmd, mu_skip_base + cur_val);
- break;
- case toks_def_code:
- define(p, assign_toks_cmd, toks_base + cur_val);
- break;
- default:
- confusion("shorthand_def");
- break;
- }
- break;
- }
- break;
- case read_to_cs_cmd:
- j = cur_chr;
- scan_int();
- n = cur_val;
- if (!scan_keyword("to")) {
- print_err("Missing `to' inserted");
- help2(
- "You should have said `\\read<number> to \\cs'.",
- "I'm going to look for the \\cs now."
- );
- error();
- }
- get_r_token();
- p = cur_cs;
- read_toks(n, p, j);
- define(p, call_cmd, cur_val);
- break;
- case toks_register_cmd:
- case assign_toks_cmd:
- /*tex
- The token-list parameters, \.{\\output} and \.{\\everypar}, etc.,
- receive their values in the following way. (For safety's sake, we
- place an enclosing pair of braces around an \.{\\output} list.)
- */
- q = cur_cs;
- if (cur_cmd == toks_register_cmd) {
- scan_register_num();
- p = toks_base + cur_val;
- } else {
- /*tex |p=every_par_loc| or |output_routine_loc| or \dots */
- p = cur_chr;
- }
- scan_optional_equals();
- /*tex Get the next non-blank non-relax non-call token */
- do {
- get_x_token();
- } while ((cur_cmd == spacer_cmd) || (cur_cmd == relax_cmd));
-
- if (cur_cmd != left_brace_cmd) {
- /*tex
- If the right-hand side is a token parameter or token
- register, finish the assignment and |goto done|
- */
- if (cur_cmd == toks_register_cmd) {
- scan_register_num();
- cur_cmd = assign_toks_cmd;
- cur_chr = toks_base + cur_val;
- }
- if (cur_cmd == assign_toks_cmd) {
- q = equiv(cur_chr);
- if (q == null) {
- define(p, undefined_cs_cmd, null);
- } else {
- add_token_ref(q);
- define(p, call_cmd, q);
- }
- goto DONE;
- }
- }
- back_input();
- cur_cs = q;
- q = scan_toks(false, false);
- if (token_link(def_ref) == null) { /* empty list: revert to the default */
- define(p, undefined_cs_cmd, null);
- free_avail(def_ref);
- } else {
- if (p == output_routine_loc) { /* enclose in curlies */
- p = get_avail();
- set_token_link(q, p);
- p = output_routine_loc;
- q = token_link(q);
- set_token_info(q, right_brace_token + '}');
- q = get_avail();
- set_token_info(q, left_brace_token + '{');
- set_token_link(q, token_link(def_ref));
- set_token_link(def_ref, q);
- }
- define(p, call_cmd, def_ref);
- }
- break;
- case assign_int_cmd:
- /*tex Similar routines are used to assign values to the numeric parameters. */
- p = cur_chr;
- scan_optional_equals();
- scan_int();
- assign_internal_value(a, p, cur_val);
- break;
- case assign_attr_cmd:
- p = cur_chr;
- scan_optional_equals();
- scan_int();
- if ((p - attribute_base) > max_used_attr)
- max_used_attr = (p - attribute_base);
- attr_list_cache = cache_disabled;
- word_define(p, cur_val);
- break;
- case assign_direction_cmd:
- case assign_dir_cmd:
- /*tex Assign direction codes. */
- if (cur_cmd == assign_direction_cmd) {
- p = cur_chr;
- scan_optional_equals();
- scan_int();
- check_dir_value(cur_val);
- cur_chr = p;
- } else {
- scan_direction();
- }
- switch (cur_chr) {
- case int_base + page_direction_code:
- eq_word_define(int_base + page_direction_code, cur_val);
- break;
- case int_base + body_direction_code:
- eq_word_define(int_base + body_direction_code, cur_val);
- break;
- case int_base + par_direction_code:
- eq_word_define(int_base + par_direction_code, cur_val);
- break;
- case int_base + math_direction_code:
- eq_word_define(int_base + math_direction_code, cur_val);
- break;
- case int_base + text_direction_code:
- case int_base + line_direction_code:
- /*
- pre version 0.97 this was a commented section because various tests hint that this
- is unnecessary and sometimes even produces weird results, like:
-
- (\hbox{\textdir TRT ABC\textdir TLT DEF}))
-
- becomes
-
- (DEFCBA)
-
- in the output when we use
-
- tail_append(new_dir(text_direction_par)
-
- but when we append the reverse of the current it goes better
-
- */
- check_glue = (cur_chr == (int_base + line_direction_code));
- if (check_glue) {
- cur_chr = int_base + text_direction_code ;
- }
- if (abs(mode) == hmode) {
- if (no_local_dirs_par > 0) {
- /*tex |tail| is non zero but we test anyway. */
- if (check_glue && (tail != null && type(tail) == glue_node)) {
- halfword prev = alink(tail);
- halfword dirn = new_dir(text_direction_par);
- subtype(dirn) = cancel_dir;
- couple_nodes(prev,dirn);
- couple_nodes(dirn,tail);
- } else {
- tail_append(new_dir(text_direction_par));
- subtype(tail) = cancel_dir;
- }
- } else {
- /*tex What is the use of nolocaldirs? Maybe we should get rid of it. */
- }
- update_text_dir_ptr(cur_val);
- tail_append(new_dir(cur_val));
- dir_level(tail) = cur_level;
- } else {
- update_text_dir_ptr(cur_val);
- }
- eq_word_define(int_base + text_direction_code, cur_val);
- eq_word_define(int_base + no_local_dirs_code, no_local_dirs_par + 1);
- break;
- }
- break;
- case assign_dimen_cmd:
- p = cur_chr;
- scan_optional_equals();
- scan_normal_dimen();
- assign_internal_value(a, p, cur_val);
- break;
- case assign_glue_cmd:
- case assign_mu_glue_cmd:
- p = cur_chr;
- n = cur_cmd;
- scan_optional_equals();
- if (n == assign_mu_glue_cmd)
- scan_glue(mu_val_level);
- else
- scan_glue(glue_val_level);
- define(p, glue_ref_cmd, cur_val);
- break;
- case def_char_code_cmd:
- case def_del_code_cmd:
- /*tex Let |n| be the largest legal code value, based on |cur_chr| */
- if (cur_chr == cat_code_base)
- n = max_char_code;
- else if (cur_chr == sf_code_base)
- n = 077777;
- else
- n = biggest_char;
- p = cur_chr;
- if (cur_chr == math_code_base) {
- if (is_global(a))
- cur_val1 = level_one;
- else
- cur_val1 = cur_level;
- scan_extdef_math_code(cur_val1, tex_mathcode);
- } else if (cur_chr == lc_code_base) {
- scan_char_num();
- p = cur_val;
- scan_optional_equals();
- scan_int();
- check_def_code(lc_code_base);
- define_lc_code(p, cur_val);
- } else if (cur_chr == uc_code_base) {
- scan_char_num();
- p = cur_val;
- scan_optional_equals();
- scan_int();
- check_def_code(uc_code_base);
- define_uc_code(p, cur_val);
- } else if (cur_chr == sf_code_base) {
- scan_char_num();
- p = cur_val;
- scan_optional_equals();
- scan_int();
- check_def_code(sf_code_base);
- define_sf_code(p, cur_val);
- } else if (cur_chr == cat_code_base) {
- scan_char_num();
- p = cur_val;
- scan_optional_equals();
- scan_int();
- check_def_code(cat_code_base);
- define_cat_code(p, cur_val);
- } else if (cur_chr == del_code_base) {
- if (is_global(a))
- cur_val1 = level_one;
- else
- cur_val1 = cur_level;
- scan_extdef_del_code(cur_val1, tex_mathcode);
- }
- break;
- case extdef_math_code_cmd:
- case extdef_del_code_cmd:
- if (is_global(a))
- cur_val1 = level_one;
- else
- cur_val1 = cur_level;
- if (cur_chr == math_code_base)
- scan_extdef_math_code(cur_val1, umath_mathcode);
- else if (cur_chr == math_code_base + 1)
- scan_extdef_math_code(cur_val1, umathnum_mathcode);
- else if (cur_chr == del_code_base)
- scan_extdef_del_code(cur_val1, umath_mathcode);
- else if (cur_chr == del_code_base + 1)
- scan_extdef_del_code(cur_val1, umathnum_mathcode);
- break;
- case def_family_cmd:
- p = cur_chr;
- scan_math_family_int();
- cur_val1 = cur_val;
- scan_optional_equals();
- scan_font_ident();
- define_fam_fnt(cur_val1, p, cur_val);
- break;
- case set_math_param_cmd:
- p = cur_chr;
- get_token();
- if (cur_cmd != math_style_cmd) {
- print_err("Missing math style, treated as \\displaystyle");
- help1(
- "A style should have been here; I inserted `\\displaystyle'."
- );
- cur_val1 = display_style;
- back_error();
- } else {
- cur_val1 = cur_chr;
- }
- scan_optional_equals();
- if (p < math_param_first_mu_glue) {
- if (p == math_param_radical_degree_raise)
- scan_int();
- else
- scan_dimen(false, false, false);
- } else {
- scan_glue(mu_val_level);
- if (cur_val == thin_mu_skip_par)
- cur_val = thin_mu_skip_code;
- else if (cur_val == med_mu_skip_par)
- cur_val = med_mu_skip_code;
- else if (cur_val == thick_mu_skip_par)
- cur_val = thick_mu_skip_code;
- }
- define_math_param(p, cur_val1, cur_val);
- break;
- case register_cmd:
- case advance_cmd:
- case multiply_cmd:
- case divide_cmd:
- do_register_command(a);
- break;
- case set_box_cmd:
- /*tex
- The processing of boxes is somewhat different, because we may
- need to scan and create an entire box before we actually change
- the value of the old one.
- */
- scan_register_num();
- if (is_global(a))
- n = global_box_flag + cur_val;
- else
- n = box_flag + cur_val;
- scan_optional_equals();
- if (set_box_allowed) {
- scan_box(n);
- } else {
- print_err("Improper \\setbox");
- help3(
- "Sorry, \\setbox is not allowed after \\halign in a display,",
- "between \\accent and an accented character, or in immediate",
- "assignments."
- );
- error();
- }
- break;
- case set_aux_cmd:
- /*tex
- The |space_factor| or |prev_depth| settings are changed when a
- |set_aux| command is sensed. Similarly, |prev_graf| is changed in
- the presence of |set_prev_graf|, and |dead_cycles| or
- |insert_penalties| in the presence of |set_page_int|. These
- definitions are always global.
- */
- alter_aux();
- break;
- case set_prev_graf_cmd:
- alter_prev_graf();
- break;
- case set_page_dimen_cmd:
- alter_page_so_far();
- break;
- case set_page_int_cmd:
- alter_integer();
- break;
- case set_box_dimen_cmd:
- /*tex
- When some dimension of a box register is changed, the change
- isn't exactly global; but \TeX\ does not look at the \.{\\global}
- switch.
- */
- alter_box_dimen();
- break;
- case set_tex_shape_cmd:
- q = cur_chr;
- scan_optional_equals();
- scan_int();
- n = cur_val;
- if (n <= 0) {
- p = null;
- } else {
- p = new_node(shape_node, 2 * (n + 1) + 1);
- vinfo(p + 1) = n;
- for (j = 1; j <= n; j++) {
- scan_normal_dimen();
- varmem[p + 2 * j].cint = cur_val; /* indentation */
- scan_normal_dimen();
- varmem[p + 2 * j + 1].cint = cur_val; /* width */
- }
- }
- define(q, shape_ref_cmd, p);
- break;
- case set_etex_shape_cmd:
- q = cur_chr;
- scan_optional_equals();
- scan_int();
- n = cur_val;
- if (n <= 0) {
- p = null;
- } else {
- n = (cur_val / 2) + 1;
- p = new_node(shape_node, 2 * n + 1 + 1);
- vinfo(p + 1) = n;
- n = cur_val;
- varmem[p + 2].cint = n; /* number of penalties */
- for (j = p + 3; j <= p + n + 2; j++) {
- scan_int();
- varmem[j].cint = cur_val; /* penalty values */
- }
- if (!odd(n))
- varmem[p + n + 3].cint = 0; /* unused */
- }
- define(q, shape_ref_cmd, p);
- break;
- case hyph_data_cmd:
- /*tex
- All of \TeX's parameters are kept in |eqtb| except the font
- information, the interaction mode, and the hyphenation tables;
- these are strictly global.
- */
- switch (cur_chr) {
- case 0:
- new_hyph_exceptions();
- break;
- case 1:
- new_patterns();
- break;
- case 2:
- new_pre_hyphen_char();
- break;
- case 3:
- new_post_hyphen_char();
- break;
- case 4:
- new_pre_exhyphen_char();
- break;
- case 5:
- new_post_exhyphen_char();
- break;
- case 6:
- new_hyphenation_min();
- break;
- case 7:
- new_hj_code();
- break;
- }
- break;
- case assign_font_dimen_cmd:
- set_font_dimen();
- break;
- case assign_font_int_cmd:
- n = cur_chr;
- scan_font_ident();
- f = cur_val;
- if (n == no_lig_code) {
- set_no_ligatures(f);
- } else if (n < lp_code_base) {
- scan_optional_equals();
- scan_int();
- if (n == 0)
- set_hyphen_char(f, cur_val);
- else
- set_skew_char(f, cur_val);
- } else {
- scan_char_num();
- p = cur_val;
- scan_optional_equals();
- scan_int();
- switch (n) {
- case lp_code_base:
- set_lp_code(f, p, cur_val);
- break;
- case rp_code_base:
- set_rp_code(f, p, cur_val);
- break;
- case ef_code_base:
- set_ef_code(f, p, cur_val);
- break;
- case tag_code:
- set_tag_code(f, p, cur_val);
- break;
- }
- }
- break;
- case def_font_cmd:
- /*tex Here is where the information for a new font gets loaded. */
- tex_def_font((small_number) a);
- break;
- case def_lua_call_cmd:
- get_r_token();
- p = cur_cs;
- scan_optional_equals();
- scan_int();
- if (j != 0) {
- define(p, lua_call_cmd, cur_val);
- } else {
- define(p, lua_expandable_call_cmd, cur_val);
- }
- break;
- case letterspace_font_cmd:
- new_letterspaced_font((small_number) a);
- break;
- case copy_font_cmd:
- make_font_copy((small_number) a);
- break;
- case set_font_id_cmd:
- scan_int();
- if (is_valid_font(cur_val))
- zset_cur_font(cur_val);
- break ;
- case set_interaction_cmd:
- new_interaction();
- break;
- default:
- confusion("prefix");
- break;
- }
- /*tex End of assignments cases. */
- DONE:
- /*tex Insert a token saved by \.{\\afterassignment}, if any. */
- if (after_token != 0) {
- cur_tok = after_token;
- back_input();
- after_token = 0;
- }
-}
-
-void fixup_directions(void)
-{
- int temp_no_whatsits = no_local_whatsits_par;
- int temp_no_dirs = no_local_dirs_par;
- int temporary_dir = text_direction_par;
- if (dir_level(text_dir_ptr) == cur_level) {
- /* Remove from |text_dir_ptr|. */
- halfword text_dir_tmp = vlink(text_dir_ptr);
- flush_node(text_dir_ptr);
- text_dir_ptr = text_dir_tmp;
- }
- unsave();
- if (abs(mode) == hmode) {
- if (temp_no_dirs != 0) {
- /* Add local dir node. */
- tail_append(new_dir(text_direction_par));
- dir_dir(tail) = temporary_dir;
- subtype(tail) = cancel_dir;
- }
- if (temp_no_whatsits != 0) {
- /*tex Add local paragraph node. */
- tail_append(make_local_par_node(hmode_par_par_code));
- }
- }
-}
-
-/*tex
-
- This is experimental and needs more checking!
-
-*/
-
-void fixup_directions_only(void)
-{
- int temp_no_dirs = no_local_dirs_par;
- int temporary_dir = text_direction_par;
- if (dir_level(text_dir_ptr) == cur_level) {
- /* Remove from |text_dir_ptr|. */
- halfword text_dir_tmp = vlink(text_dir_ptr);
- flush_node(text_dir_ptr);
- text_dir_ptr = text_dir_tmp;
- }
- if (temp_no_dirs != 0) {
- /* Add local dir node. */
- tail_append(new_dir(text_direction_par));
- dir_dir(tail) = temporary_dir;
- subtype(tail) = cancel_dir;
- }
-}
-
-/*tex
-
-When a control sequence is to be defined, by \.{\\def} or \.{\\let} or something
-similar, the |get_r_token| routine will substitute a special control sequence for
-a token that is not redefinable.
-
-*/
-
-void get_r_token(void)
-{
- RESTART:
- do {
- get_token();
- } while (cur_tok == space_token);
- if ((cur_cs == 0) || (cur_cs > eqtb_top) ||
- ((cur_cs > frozen_control_sequence) && (cur_cs <= eqtb_size))) {
- print_err("Missing control sequence inserted");
- help5(
- "Please don't say `\\def cs{...}', say `\\def\\cs{...}'.",
- "I've inserted an inaccessible control sequence so that your",
- "definition will be completed without mixing me up too badly.",
- "You can recover graciously from this error, if you're",
- "careful; see exercise 27.2 in The TeXbook."
- );
- if (cur_cs == 0)
- back_input();
- cur_tok = cs_token_flag + frozen_protection;
- ins_error();
- goto RESTART;
- }
-}
-
-void assign_internal_value(int a, halfword p, int val)
-{
- halfword n;
- if ((p >= int_base) && (p < attribute_base)) {
- switch ((p - int_base)) {
- case cat_code_table_code:
- if (valid_catcode_table(val)) {
- if (val != cat_code_table_par)
- word_define(p, val);
- } else {
- print_err("Invalid \\catcode table");
- help2(
- "You can only switch to a \\catcode table that is initialized",
- "using \\savecatcodetable or \\initcatcodetable, or to table 0"
- );
- error();
- }
- break;
- case output_box_code:
- if ((val > 65535) | (val < 0)) {
- print_err("Invalid \\outputbox");
- help1(
- "The value for \\outputbox has to be between 0 and 65535."
- );
- error();
- } else {
- word_define(p, val);
- }
- break;
- case new_line_char_code:
- if (val > 127) {
- print_err("Invalid \\newlinechar");
- help2(
- "The value for \\newlinechar has to be no higher than 127.",
- "Your invalid assignment will be ignored."
- );
- error();
- } else {
- word_define(p, val);
- }
- break;
- case end_line_char_code:
- if (val > 127) {
- print_err("Invalid \\endlinechar");
- help2(
- "The value for \\endlinechar has to be no higher than 127.",
- "Your invalid assignment will be ignored."
- );
- error();
- } else {
- word_define(p, val);
- }
- break;
- case language_code:
- if (val < 0) {
- word_define(int_base + cur_lang_code, -1);
- word_define(p, -1);
- } else if (val > 16383) {
- print_err("Invalid \\language");
- help2(
- "The absolute value for \\language has to be no higher than 16383.",
- "Your invalid assignment will be ignored."
- );
- error();
- } else {
- word_define(int_base + cur_lang_code, val);
- word_define(p, val);
- }
- break;
- default:
- word_define(p, val);
- break;
- }
- /*tex
- If we are defining subparagraph penalty levels while we are in hmode,
- then we put out a whatsit immediately, otherwise we leave it alone.
- This mechanism might not be sufficiently powerful, and some other
- algorithm, searching down the stack, might be necessary. Good first
- step.
- */
- if ((abs(mode) == hmode) &&
- ((p == (int_base + local_inter_line_penalty_code)) ||
- (p == (int_base + local_broken_penalty_code)))) {
- /*tex Add local paragraph node */
- tail_append(make_local_par_node(penalty_par_code));
- eq_word_define(int_base + no_local_whatsits_code, no_local_whatsits_par + 1);
- }
- } else if ((p >= dimen_base) && (p <= eqtb_size)) {
- if (p == (dimen_base + page_left_offset_code)) {
- n = val - one_true_inch;
- word_define(dimen_base + h_offset_code, n);
- } else if (p == (dimen_base + h_offset_code)) {
- n = val + one_true_inch;
- word_define(dimen_base + page_left_offset_code, n);
- } else if (p == (dimen_base + page_top_offset_code)) {
- n = val - one_true_inch;
- word_define(dimen_base + v_offset_code, n);
- } else if (p == (dimen_base + v_offset_code)) {
- n = val + one_true_inch;
- word_define(dimen_base + page_top_offset_code, n);
- }
- word_define(p, val);
- } else if ((p >= local_base) && (p < toks_base)) {
- /*tex internal locals */
- define(p, call_cmd, val);
- } else {
- confusion("assign internal value");
- }
-}
-
-/*tex
-
-We use the fact that |register| $<$ |advance| $<$ |multiply| $<$ |divide|/ We
-compute the register location |l| and its type |p| but |return| if invalid. Here
-we use the fact that the consecutive codes |int_val..mu_val| and
-|assign_int..assign_mu_glue| correspond to each other nicely.
-
-*/
-
-void do_register_command(int a)
-{
- int p;
- halfword q = cur_cmd;
- halfword l = 0;
- if (q != register_cmd) {
- get_x_token();
- if ((cur_cmd >= assign_int_cmd) && (cur_cmd <= assign_mu_glue_cmd)) {
- l = cur_chr;
- p = cur_cmd - assign_int_cmd;
- goto FOUND;
- }
- if (cur_cmd != register_cmd) {
- print_err("You can't use `");
- print_cmd_chr((quarterword) cur_cmd, cur_chr);
- tprint("' after ");
- print_cmd_chr((quarterword) q, 0);
- help1(
- "I'm forgetting what you said and not changing anything."
- );
- error();
- return;
- }
- }
- p = cur_chr;
- scan_register_num();
- if (p == int_val_level)
- l = cur_val + count_base;
- else if (p == attr_val_level)
- l = cur_val + attribute_base;
- else if (p == dimen_val_level)
- l = cur_val + scaled_base;
- else if (p == glue_val_level)
- l = cur_val + skip_base;
- else if (p == mu_val_level)
- l = cur_val + mu_skip_base;
- FOUND:
- if (q == register_cmd) {
- scan_optional_equals();
- } else if (scan_keyword("by")) {
- /*tex optional `\.{by}' */
- }
- arith_error = false;
- if (q < multiply_cmd) {
- /*tex Compute result of |register| or |advance|, put it in |cur_val|. */
- if (p < glue_val_level) {
- if ((p == int_val_level) || (p == attr_val_level))
- scan_int();
- else
- scan_normal_dimen();
- if (q == advance_cmd)
- cur_val = cur_val + eqtb[l].cint;
- } else {
- scan_glue(p);
- if (q == advance_cmd) {
- /* Compute the sum of two glue specs */
- halfword r = equiv(l);
- q = new_spec(cur_val);
- flush_node(cur_val);
- width(q) = width(q) + width(r);
- if (stretch(q) == 0) {
- stretch_order(q) = normal;
- }
- if (stretch_order(q) == stretch_order(r)) {
- stretch(q) = stretch(q) + stretch(r);
- } else if ((stretch_order(q) < stretch_order(r)) && (stretch(r) != 0)) {
- stretch(q) = stretch(r);
- stretch_order(q) = stretch_order(r);
- }
- if (shrink(q) == 0) {
- shrink_order(q) = normal;
- }
- if (shrink_order(q) == shrink_order(r)) {
- shrink(q) = shrink(q) + shrink(r);
- } else if ((shrink_order(q) < shrink_order(r)) && (shrink(r) != 0)) {
- shrink(q) = shrink(r);
- shrink_order(q) = shrink_order(r);
- }
- cur_val = q;
- }
- }
- } else {
- /*tex Compute result of |multiply| or |divide|, put it in |cur_val| */
- scan_int();
- if (p < glue_val_level) {
- if (q == multiply_cmd) {
- if ((p == int_val_level) || (p == attr_val_level)) {
- cur_val = mult_integers(eqtb[l].cint, cur_val);
- } else {
- cur_val = nx_plus_y(eqtb[l].cint, cur_val, 0);
- }
- } else {
- cur_val = x_over_n(eqtb[l].cint, cur_val);
- }
- } else {
- halfword s = equiv(l);
- halfword r = new_spec(s);
- if (q == multiply_cmd) {
- width(r) = nx_plus_y(width(s), cur_val, 0);
- stretch(r) = nx_plus_y(stretch(s), cur_val, 0);
- shrink(r) = nx_plus_y(shrink(s), cur_val, 0);
- } else {
- width(r) = x_over_n(width(s), cur_val);
- stretch(r) = x_over_n(stretch(s), cur_val);
- shrink(r) = x_over_n(shrink(s), cur_val);
- }
- cur_val = r;
- }
- }
- if (arith_error) {
- print_err("Arithmetic overflow");
- help2(
- "I can't carry out that multiplication or division,",
- "since the result is out of range."
- );
- if (p >= glue_val_level)
- flush_node(cur_val);
- error();
- return;
- }
- if (p < glue_val_level) {
- if (p == attr_val_level) {
- if ((l - attribute_base) > max_used_attr)
- max_used_attr = (l - attribute_base);
- attr_list_cache = cache_disabled;
- }
- if ((p == int_val_level) || (p == dimen_val_level))
- assign_internal_value(a, l, cur_val);
- else
- word_define(l, cur_val);
- } else {
- define(l, glue_ref_cmd, cur_val);
- }
-}
-
-void alter_aux(void)
-{
- halfword c; /* |hmode| or |vmode| */
- if (cur_chr != abs(mode)) {
- report_illegal_case();
- } else {
- c = cur_chr;
- scan_optional_equals();
- if (c == vmode) {
- scan_normal_dimen();
- prev_depth_par = cur_val;
- } else {
- scan_int();
- if ((cur_val <= 0) || (cur_val > 32767)) {
- print_err("Bad space factor");
- help1(
- "I allow only values in the range 1..32767 here."
- );
- int_error(cur_val);
- } else {
- space_factor_par = cur_val;
- }
- }
- }
-}
-
-void alter_prev_graf(void)
-{
- int p = nest_ptr; /* index into |nest| */
- while (abs(nest[p].mode_field) != vmode)
- decr(p);
- scan_optional_equals();
- scan_int();
- if (cur_val < 0) {
- print_err("Bad \\prevgraf");
- help1(
- "I allow only nonnegative values here."
- );
- int_error(cur_val);
- } else {
- nest[p].pg_field = cur_val;
- }
-}
-
-void alter_page_so_far(void)
-{
- int c = cur_chr; /* index into |page_so_far| */
- scan_optional_equals();
- scan_normal_dimen();
- page_so_far[c] = cur_val;
-}
-
-/*tex
- The value of |c| is 0 for \.{\\deadcycles}, 1 for \.{\\insertpenalties}, etc.
-*/
-
-void alter_integer(void)
-{
- int c = cur_chr;
- scan_optional_equals();
- scan_int();
- if (c == 0) {
- dead_cycles = cur_val;
- } else if (c == 2) {
- if ((cur_val < batch_mode) || (cur_val > error_stop_mode)) {
- print_err("Bad interaction mode");
- help2(
- "Modes are 0=batch, 1=nonstop, 2=scroll, and",
- "3=errorstop. Proceed, and I'll ignore this case."
- );
- int_error(cur_val);
- } else {
- cur_chr = cur_val;
- new_interaction();
- }
- } else {
- insert_penalties = cur_val;
- }
-}
-
-void alter_box_dimen(void)
-{
- int c; /* |width_offset| or |height_offset| or |depth_offset| */
- int b; /* box number */
- c = cur_chr;
- scan_register_num();
- b = cur_val;
- scan_optional_equals();
- scan_normal_dimen();
- if (box(b) != null)
- varmem[box(b) + c].cint = cur_val;
-}
-
-void new_interaction(void)
-{
- print_ln();
- interaction = cur_chr;
- if (interaction == batch_mode)
- kpse_make_tex_discard_errors = 1;
- else
- kpse_make_tex_discard_errors = 0;
- fixup_selector(log_opened_global);
-}
-
-/*tex
-
-The \.{\\afterassignment} command puts a token into the global variable
-|after_token|. This global variable is examined just after every assignment has
-been performed. It's value is zero, or a saved token.
-
-*/
-
-halfword after_token;
-
-/*tex
-
- Here is a procedure that might be called `Get the next non-blank non-relax
- non-call non-assignment token'.
-
-*/
-
-void do_assignments(void)
-{
- while (true) {
- /*tex Get the next non-blank non-relax... */
- do {
- get_x_token();
- } while ((cur_cmd == spacer_cmd) || (cur_cmd == relax_cmd));
- if (cur_cmd <= max_non_prefixed_command)
- return;
- set_box_allowed = false;
- prefixed_command();
- set_box_allowed = true;
- }
-}
-
-/*tex |cur_chr| is 1 for \.{\\openin}, 0 for \.{\\closein}: */
-
-void open_or_close_in(void)
-{
- int c = cur_chr;
- int n;
- char *fn;
- scan_four_bit_int();
- n = cur_val;
- if (read_open[n] != closed) {
- lua_a_close_in(read_file[n], (n + 1));
- read_open[n] = closed;
- }
- if (c != 0) {
- scan_optional_equals();
- do {
- get_x_token();
- } while ((cur_cmd == spacer_cmd) || (cur_cmd == relax_cmd));
- back_input();
- if (cur_cmd != left_brace_cmd) {
- /*tex Set |cur_name| to desired file name. */
- scan_file_name();
- } else {
- scan_file_name_toks();
- }
- fn = pack_file_name(cur_name, cur_area, cur_ext);
- if (lua_a_open_in(&(read_file[n]), fn, (n + 1))) {
- read_open[n] = just_open;
- }
- }
-}
-
-/*tex
- Has the long \.{\\errmessage} help been used?
-*/
-
-boolean long_help_seen;
-
-void issue_message(void)
-{
- int old_setting; /* holds |selector| setting */
- int c; /* identifies \.{\\message} and \.{\\errmessage} */
- str_number s; /* the message */
- c = cur_chr;
- (void) scan_toks(false, true);
- old_setting = selector;
- selector = new_string;
- token_show(def_ref);
- selector = old_setting;
- flush_list(def_ref);
- str_room(1);
- s = make_string();
- if (c == 0) {
- /*tex Print string |s| on the terminal */
- if (term_offset + (int) str_length(s) > max_print_line - 2)
- print_ln();
- else if ((term_offset > 0) || (file_offset > 0))
- print_char(' ');
- print(s);
- update_terminal();
-
- } else {
- /*tex
- Print string |s| as an error message. If \.{\\errmessage} occurs
- often in |scroll_mode|, without user-defined \.{\\errhelp}, we don't
- want to give a long help message each time. So we give a verbose
- explanation only once.
- */
- print_err("");
- print(s);
- if (err_help_par != null) {
- use_err_help = true;
- } else if (long_help_seen) {
- help1(
- "(That was another \\errmessage.)"
- );
- } else {
- if (interaction < error_stop_mode)
- long_help_seen = true;
- help4(
- "This error message was generated by an \\errmessage",
- "command, so I can't give any explicit help.",
- "Pretend that you're Hercule Poirot: Examine all clues,",
- "and deduce the truth by order and method."
- );
- }
- error();
- use_err_help = false;
-
- }
- flush_str(s);
-}
-
-/*tex
-
-The |error| routine calls on |give_err_help| if help is requested from the
-|err_help| parameter.
-
-*/
-
-void give_err_help(void)
-{
- token_show(err_help_par);
-}
-
-/*tex
-
-The \.{\\uppercase} and \.{\\lowercase} commands are implemented by building a
-token list and then changing the cases of the letters in it.
-
-*/
-
-void shift_case(void)
-{
- halfword b; /* |lc_code_base| or |uc_code_base| */
- halfword p; /* runs through the token list */
- halfword t; /* token */
- halfword c; /* character code */
- halfword i; /* inbetween */
- b = cur_chr;
- p = scan_toks(false, false);
- p = token_link(def_ref);
- while (p != null) {
- /*tex
- Change the case of the token in |p|, if a change is appropriate. When
- the case of a |chr_code| changes, we don't change the |cmd|. We also
- change active characters.
- */
- t = token_info(p);
- if (t < cs_token_flag) {
- c = t % STRING_OFFSET;
- if (b == uc_code_base)
- i = get_uc_code(c);
- else
- i = get_lc_code(c);
- if (i != 0)
- set_token_info(p, t - c + i);
- } else if (is_active_cs(cs_text(t - cs_token_flag))) {
- c = active_cs_value(cs_text(t - cs_token_flag));
- if (b == uc_code_base)
- i = get_uc_code(c);
- else
- i = get_lc_code(c);
- if (i != 0)
- set_token_info(p, active_to_cs(i, true) + cs_token_flag);
- }
- p = token_link(p);
- }
- back_list(token_link(def_ref));
- free_avail(def_ref);
-}
-
-/*tex
-
-We come finally to the last pieces missing from |main_control|, namely the
-`\.{\\show}' commands that are useful when debugging.
-
-*/
-
-void show_whatever(void)
-{
- halfword p; /* tail of a token list to show */
- int t; /* type of conditional being shown */
- int m; /* upper bound on |fi_or_else| codes */
- int l; /* line where that conditional began */
- int n; /* level of \.{\\if...\\fi} nesting */
- switch (cur_chr) {
- case show_lists:
- begin_diagnostic();
- show_activities();
- break;
- case show_box_code:
- /*tex Show the current contents of a box. */
- scan_register_num();
- begin_diagnostic();
- tprint_nl("> \\box");
- print_int(cur_val);
- print_char('=');
- if (box(cur_val) == null)
- tprint("void");
- else
- show_box(box(cur_val));
- break;
- case show_code:
- /*tex Show the current meaning of a token, then |goto common_ending|. */
- get_token();
- if (interaction == error_stop_mode)
- wake_up_terminal();
- tprint_nl("> ");
- if (cur_cs != 0) {
- sprint_cs(cur_cs);
- print_char('=');
- }
- print_meaning();
- goto COMMON_ENDING;
- break;
- /*tex Cases for |show_whatever| */
- case show_groups:
- begin_diagnostic();
- show_save_groups();
- break;
- case show_ifs:
- begin_diagnostic();
- tprint_nl("");
- print_ln();
- if (cond_ptr == null) {
- tprint_nl("### ");
- tprint("no active conditionals");
- } else {
- p = cond_ptr;
- n = 0;
- do {
- incr(n);
- p = vlink(p);
- } while (p != null);
- p = cond_ptr;
- t = cur_if;
- l = if_line;
- m = if_limit;
- do {
- tprint_nl("### level ");
- print_int(n);
- tprint(": ");
- print_cmd_chr(if_test_cmd, t);
- if (m == fi_code)
- tprint_esc("else");
- print_if_line(l);
- decr(n);
- t = if_limit_subtype(p);
- l = if_line_field(p);
- m = if_limit_type(p);
- p = vlink(p);
- } while (p != null);
- }
- break;
- default:
- /*tex
- Show the current value of some parameter or register, then |goto
- common_ending|.
- */
- p = the_toks();
- if (interaction == error_stop_mode)
- wake_up_terminal();
- tprint_nl("> ");
- token_show(temp_token_head);
- flush_list(token_link(temp_token_head));
- goto COMMON_ENDING;
- break;
- }
- /*tex Complete a potentially long \.{\\show} command: */
- end_diagnostic(true);
- print_err("OK");
- if (selector == term_and_log) {
- if (tracing_online_par <= 0) {
- selector = term_only;
- tprint(" (see the transcript file)");
- selector = term_and_log;
- }
- }
- COMMON_ENDING:
- if (interaction < error_stop_mode) {
- help0();
- decr(error_count);
- } else if (tracing_online_par > 0) {
- help3(
- "This isn't an error message; I'm just \\showing something.",
- "Type `I\\show...' to show more (e.g., \\show\\cs,",
- "\\showthe\\count10, \\showbox255, \\showlists)."
- );
- } else {
- help5(
- "This isn't an error message; I'm just \\showing something.",
- "Type `I\\show...' to show more (e.g., \\show\\cs,",
- "\\showthe\\count10, \\showbox255, \\showlists).",
- "And type `I\\tracingonline=1\\show...' to show boxes and",
- "lists on your terminal as well as in the transcript file."
- );
- }
- error();
-}
-
-/*tex
- This procedure gets things started properly:
-*/
-
-void initialize(void)
-{
- int k; /* index into |mem|, |eqtb|, etc. */
- /*tex
- Initialize whatever \TeX\ might access and set initial values of key
- variables
- */
- initialize_errors();
- initialize_arithmetic();
- max_used_attr = -1;
- attr_list_cache = cache_disabled;
- initialize_nesting();
- /*tex Start a new current page: */
- page_contents = empty;
- page_tail = page_head;
-#if 0
- vlink(page_head) = null;
-#endif
- last_glue = max_halfword;
- last_penalty = 0;
- last_kern = 0;
- last_node_type = -1;
- page_depth = 0;
- page_max_depth = 0;
-
- initialize_equivalents();
- no_new_control_sequence = true; /* new identifiers are usually forbidden */
- init_primitives();
-
- mag_set = 0;
- initialize_marks();
- initialize_read();
-
- static_pdf = init_pdf_struct(static_pdf); /* should be init_backend() */
-
- format_ident = 0;
- format_name = get_nullstr();
- initialize_directions();
- initialize_write_files();
- seconds_and_micros(epochseconds, microseconds);
- initialize_start_time(static_pdf);
-
- edit_name_start = 0;
- stop_at_space = true;
-
- if (ini_version) {
- /*tex Initialize table entries (done by \.{INITEX} only). */
- init_node_mem(500);
- initialize_tokens();
- /*tex Initialize the special list heads and constant nodes. */
- initialize_alignments();
- initialize_buildpage();
-
- initialize_active();
-
- set_eq_type(undefined_control_sequence, undefined_cs_cmd);
- set_equiv(undefined_control_sequence, null);
- set_eq_level(undefined_control_sequence, level_zero);
- for (k = null_cs; k <= (eqtb_top - 1); k++)
- eqtb[k] = eqtb[undefined_control_sequence];
- set_equiv(glue_base, zero_glue);
- set_eq_level(glue_base, level_one);
- set_eq_type(glue_base, glue_ref_cmd);
- for (k = glue_base + 1; k <= local_base - 1; k++) {
- eqtb[k] = eqtb[glue_base];
- }
- par_shape_par_ptr = null;
- set_eq_type(par_shape_loc, shape_ref_cmd);
- set_eq_level(par_shape_loc, level_one);
- for (k = etex_pen_base; k <= (etex_pens - 1); k++)
- eqtb[k] = eqtb[par_shape_loc];
- for (k = output_routine_loc; k <= toks_base + biggest_reg; k++)
- eqtb[k] = eqtb[undefined_control_sequence];
- box(0) = null;
- set_eq_type(box_base, box_ref_cmd);
- set_eq_level(box_base, level_one);
- for (k = box_base + 1; k <= (box_base + biggest_reg); k++)
- eqtb[k] = eqtb[box_base];
- cur_font_par = null_font;
- set_eq_type(cur_font_loc, data_cmd);
- set_eq_level(cur_font_loc, level_one);
- set_equiv(cat_code_base, 0);
- set_eq_type(cat_code_base, data_cmd);
- set_eq_level(cat_code_base, level_one);
- eqtb[internal_math_param_base] = eqtb[cat_code_base];
- eqtb[lc_code_base] = eqtb[cat_code_base];
- eqtb[uc_code_base] = eqtb[cat_code_base];
- eqtb[sf_code_base] = eqtb[cat_code_base];
- eqtb[math_code_base] = eqtb[cat_code_base];
- cat_code_table_par = 0;
- initialize_math_codes();
- initialize_text_codes();
- initex_cat_codes(0);
- for (k = '0'; k <= '9'; k++)
- set_math_code(k, math_use_current_family_code, 0, k, level_one);
- for (k = 'A'; k <= 'Z'; k++) {
- set_math_code(k, math_use_current_family_code, 1, k, level_one);
- set_math_code((k + 32), math_use_current_family_code, 1, (k + 32), level_one);
- set_lc_code(k, k + 32, level_one);
- set_lc_code(k + 32, k + 32, level_one);
- set_uc_code(k, k, level_one);
- set_uc_code(k + 32, k, level_one);
- set_sf_code(k, 999, level_one);
- }
- for (k = int_base; k <= attribute_base - 1; k++)
- eqtb[k].cint = 0;
- for (k = attribute_base; k <= del_code_base - 1; k++)
- eqtb[k].cint = UNUSED_ATTRIBUTE;
- mag_par = 1000;
- tolerance_par = 10000;
- hang_after_par = 1;
- max_dead_cycles_par = 25;
- math_pre_display_gap_factor_par = 2000;
- pre_bin_op_penalty_par = inf_penalty;
- math_script_box_mode_par = 1;
- math_script_char_mode_par = 1;
- pre_rel_penalty_par = inf_penalty;
- compound_hyphen_mode_par = 1;
- escape_char_par = '\\';
- end_line_char_par = carriage_return;
- set_del_code('.', 0, 0, 0, 0, level_one); /* this null delimiter is used in error recovery */
- ex_hyphen_char_par = '-';
- output_box_par = 255;
- for (k = dimen_base; k <= eqtb_size; k++)
- eqtb[k].cint = 0;
- page_left_offset_par = one_inch;
- page_top_offset_par = one_inch;
- page_right_offset_par = one_inch;
- page_bottom_offset_par = one_inch;
- ini_init_primitives();
- hash_used = frozen_control_sequence;
- hash_high = 0;
- cs_count = 0;
- set_eq_type(frozen_dont_expand, dont_expand_cmd);
- cs_text(frozen_dont_expand) = maketexstring("notexpanded:");
- set_eq_type(frozen_primitive, ignore_spaces_cmd);
- set_equiv(frozen_primitive, 1);
- set_eq_level(frozen_primitive, level_one);
- cs_text(frozen_primitive) = maketexstring("primitive");
- create_null_font();
- font_bytes = 0;
- px_dimen_par = one_bp;
- math_eqno_gap_step_par = 1000 ;
- math_flatten_mode_par = 1; /* ord */
- cs_text(frozen_protection) = maketexstring("inaccessible");
- format_ident = maketexstring(" (INITEX)");
- cs_text(end_write) = maketexstring("endwrite");
- set_eq_level(end_write, level_one);
- set_eq_type(end_write, outer_call_cmd);
- set_equiv(end_write, null);
- /*tex Bah, this is a bad place do do this. */
- set_pdf_major_version(1);
- set_pdf_minor_version(0);
- }
- synctexoffset = int_base + synctex_code;
-}