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/* ltokenlib.c
Copyright 2006-2012 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
LuaTeX is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#include "ptexlib.h"
#include "lua/luatex-api.h"
static const char _svn_version[] =
"$Id: ltokenlib.c 4524 2012-12-20 15:38:02Z taco $ $URL: http://foundry.supelec.fr/svn/luatex/trunk/source/texk/web2c/luatexdir/lua/ltokenlib.c $";
#define is_valid_token(L,i) (lua_istable(L,i) && lua_rawlen(L,i)==3)
#define get_token_cmd(L,i) lua_rawgeti(L,i,1)
#define get_token_chr(L,i) lua_rawgeti(L,i,2)
#define get_token_cs(L,i) lua_rawgeti(L,i,3)
#define is_active_string(s) (strlen((char *)s)>3 && *s==0xEF && *(s+1)==0xBF && *(s+2)==0xBF)
static unsigned char *get_cs_text(int cs)
{
if (cs == null_cs)
return (unsigned char *) xstrdup("\\csname\\endcsname");
else if ((cs_text(cs) < 0) || (cs_text(cs) >= str_ptr))
return (unsigned char *) xstrdup("");
else
return (unsigned char *) makecstring(cs_text(cs));
}
static int test_expandable(lua_State * L)
{
int cmd = -1;
if (is_valid_token(L, -1)) {
get_token_cmd(L, -1);
if (lua_isnumber(L, -1)) {
cmd = (int) lua_tointeger(L, -1);
} else if (lua_isstring(L, -1)) {
cmd = get_command_id(lua_tostring(L, -1));
}
if (cmd > max_command_cmd) {
lua_pushboolean(L, 1);
} else {
lua_pushboolean(L, 0);
}
} else {
lua_pushnil(L);
}
return 1;
}
static int test_protected(lua_State * L)
{
int chr = -1;
if (is_valid_token(L, -1)) {
get_token_chr(L, -1);
if (lua_isnumber(L, -1)) {
chr = (int) lua_tointeger(L, -1);
} else if (lua_isstring(L, -1)) {
chr = get_command_id(lua_tostring(L, -1));
}
if (token_info(token_link(chr)) == protected_token) {
lua_pushboolean(L, 1);
} else {
lua_pushboolean(L, 0);
}
} else {
lua_pushnil(L);
}
return 1;
}
static int test_activechar(lua_State * L)
{
if (is_valid_token(L, -1)) {
unsigned char *s;
int cs = 0;
get_token_cs(L, -1);
if (lua_isnumber(L, -1)) {
cs = (int) lua_tointeger(L, -1);
}
lua_pop(L, 1);
if (cs != 0 && ((s = get_cs_text(cs)) != (unsigned char *) NULL)) {
if (is_active_string(s)) {
free(s);
lua_pushboolean(L, 1);
return 1;
}
free(s);
}
}
lua_pushboolean(L, 0);
return 1;
}
static int run_get_command_name(lua_State * L)
{
int cs;
if (is_valid_token(L, -1)) {
get_token_cmd(L, -1);
if (lua_isnumber(L, -1)) {
cs = (int) lua_tointeger(L, -1);
lua_pushstring(L, command_names[cs].cmd_name);
} else {
lua_pushstring(L, "");
}
} else {
lua_pushnil(L);
}
return 1;
}
static int run_get_csname_name(lua_State * L)
{
int cs /*, cmd*/;
unsigned char *s;
if (is_valid_token(L, -1)) {
get_token_cmd(L, -1);
/*
if (lua_isnumber(L, -1)) {
cmd = (int) lua_tointeger(L, -1);
}
*/
lua_pop(L, 1);
cs = 0;
get_token_cs(L, -1);
if (lua_isnumber(L, -1)) {
cs = (int) lua_tointeger(L, -1);
}
lua_pop(L, 1);
if (cs != 0 && ((s = get_cs_text(cs)) != (unsigned char *) NULL)) {
if (is_active_string(s))
lua_pushstring(L, (char *) (s + 3));
else
lua_pushstring(L, (char *) s);
} else {
lua_pushstring(L, "");
}
} else {
lua_pushnil(L);
}
return 1;
}
static int run_get_command_id(lua_State * L)
{
int cs = -1;
if (lua_isstring(L, -1)) {
cs = get_command_id(lua_tostring(L, -1));
}
lua_pushnumber(L, cs);
return 1;
}
static int run_get_csname_id(lua_State * L)
{
const char *s;
size_t k, cs = 0;
if (lua_isstring(L, -1)) {
s = lua_tolstring(L, -1, &k);
cs = (size_t) string_lookup(s, k);
}
lua_pushnumber(L, (lua_Number) cs);
return 1;
}
void make_token_table(lua_State * L, int cmd, int chr, int cs)
{
lua_createtable(L, 3, 0);
lua_pushnumber(L, cmd);
lua_rawseti(L, -2, 1);
lua_pushnumber(L, chr);
lua_rawseti(L, -2, 2);
lua_pushnumber(L, cs);
lua_rawseti(L, -2, 3);
}
static int run_get_next(lua_State * L)
{
int save_nncs;
save_nncs = no_new_control_sequence;
no_new_control_sequence = 0;
get_next();
no_new_control_sequence = save_nncs;
make_token_table(L, cur_cmd, cur_chr, cur_cs);
return 1;
}
static int run_expand(lua_State * L)
{
(void) L;
expand();
return 0;
}
static int run_lookup(lua_State * L)
{
const char *s;
size_t l;
int cs, cmd, chr;
int save_nncs;
if (lua_isstring(L, -1)) {
s = lua_tolstring(L, -1, &l);
if (l > 0) {
save_nncs = no_new_control_sequence;
no_new_control_sequence = true;
cs = id_lookup((last + 1), (int) l); /* cleans up the lookup buffer */
cs = string_lookup(s, l);
cmd = eq_type(cs);
chr = equiv(cs);
make_token_table(L, cmd, chr, cs);
no_new_control_sequence = save_nncs;
return 1;
}
}
lua_newtable(L);
return 1;
}
static int run_build(lua_State * L)
{
int cmd, chr, cs;
if (lua_isnumber(L, 1)) {
cs = 0;
chr = (int) lua_tointeger(L, 1);
cmd = (int) luaL_optinteger(L, 2, get_char_cat_code(chr));
if (cmd == 0 || cmd == 9 || cmd == 14 || cmd == 15) {
fprintf(stdout,
"\n\nluatex error: not a good token.\nCatcode %i can not be returned, so I replaced it by 12 (other)",
(int) cmd);
error();
cmd = 12;
}
if (cmd == 13) {
cs = active_to_cs(chr, false);
cmd = eq_type(cs);
chr = equiv(cs);
}
make_token_table(L, cmd, chr, cs);
return 1;
} else {
return run_lookup(L);
}
}
static const struct luaL_Reg tokenlib[] = {
{"get_next", run_get_next},
{"expand", run_expand},
{"lookup", run_lookup},
{"create", run_build},
{"is_expandable", test_expandable},
{"is_activechar", test_activechar},
{"is_protected", test_protected},
{"csname_id", run_get_csname_id},
{"csname_name", run_get_csname_name},
{"command_name", run_get_command_name},
{"command_id", run_get_command_id},
{NULL, NULL} /* sentinel */
};
int luaopen_token(lua_State * L)
{
luaL_register(L, "token", tokenlib);
return 1;
}
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