From ecd1605a23ef54d2a4a69e1a361172d350e03b3b Mon Sep 17 00:00:00 2001 From: Luigi Scarso Date: Wed, 5 Sep 2018 21:57:30 +0000 Subject: luatex: correct automake file for pplib; replaced cweb files with c files. git-svn-id: svn://tug.org/texlive/trunk@48594 c570f23f-e606-0410-a88d-b1316a301751 --- .../source/texk/web2c/luatexdir/tex/maincontrol.c | 4205 ++++++++++++++++++++ 1 file changed, 4205 insertions(+) create mode 100644 Build/source/texk/web2c/luatexdir/tex/maincontrol.c (limited to 'Build/source/texk/web2c/luatexdir/tex/maincontrol.c') diff --git a/Build/source/texk/web2c/luatexdir/tex/maincontrol.c b/Build/source/texk/web2c/luatexdir/tex/maincontrol.c new file mode 100644 index 00000000000..295e2c6ccae --- /dev/null +++ b/Build/source/texk/web2c/luatexdir/tex/maincontrol.c @@ -0,0 +1,4205 @@ +/* + +maincontrol.w + +Copyright 2009-2010 Taco Hoekwater + +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 . + +*/ + +#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); + while (vlink(n) != null) { + n = vlink(n); + tail_append(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); + +} + +/*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. + +*/ + +/*int local_level = 0; */ + +extern void local_control_message(const char *s) +{ + tprint("local control level "); + print_int(local_level); + tprint(": "); + tprint(s); + tprint_nl(""); +} + +void local_control(void) +{ + int ll = local_level; + main_control_state = goto_next; + local_level += 1; + 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 due to level change"); + } + return ; + } else if (main_control_state == goto_return) { + if (tracing_nesting_par > 2) { + local_control_message("leaving due to triggering"); + } + return; + } + } + return; +} + +void end_local_control(void ) +{ + local_level -= 1; +} + +/*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 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 '.", + "I found the , but there's no suitable", + ", 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 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. */ + new_hyphenation(p, null); + (void) new_ligkern(p, null); + p = lua_hpack_filter(p, 0, additional, local_box_group, -1, null); + } + 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) { + cur_cs = active_to_cs(cur_val, true); + set_token_info(cur_cs, cur_cs + cs_token_flag); + 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(); + } + } 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 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(); + if (cur_ext == get_nullstr()) + cur_ext = maketexstring(".tex"); + } 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; +} -- cgit v1.2.3