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lyx_mirror/src/mathed/math_parser.C
Lars Gullik Bjønnes ec5d8718c5 mathed95.diff 
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@2193 a592a061-630c-0410-9148-cb99ea01b6c8
2001-07-06 12:09:32 +00:00

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/*
* File: math_parser.C
* Purpose: Parser for mathed
* Author: Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
* Created: January 1996
* Description: Parse LaTeX2e math mode code.
*
* Dependencies: Xlib, XForms
*
* Copyright: 1996, Alejandro Aguilar Sierra
*
* Version: 0.8beta.
*
* You are free to use and modify this code under the terms of
* the GNU General Public Licence version 2 or later.
*/
#include <config.h>
#include <cctype>
#ifdef __GNUG__
#pragma implementation
#endif
#include "math_parser.h"
#include "array.h"
#include "math_inset.h"
#include "math_macro.h"
#include "math_macrotable.h"
#include "math_macrotemplate.h"
#include "math_root.h"
#include "math_arrayinset.h"
#include "math_sqrtinset.h"
#include "math_matrixinset.h"
#include "math_accentinset.h"
#include "math_bigopinset.h"
#include "math_funcinset.h"
#include "math_spaceinset.h"
#include "math_sizeinset.h"
#include "math_dotsinset.h"
#include "math_fracinset.h"
#include "math_deliminset.h"
#include "math_decorationinset.h"
#include "debug.h"
#include "mathed/support.h"
#include "lyxlex.h"
using std::istream;
using std::endl;
// These are lexical codes, not semantic
enum lexcode_enum {
LexNone,
LexESC,
LexAlpha,
LexDigit,
LexBOP, // Binary operators or relations
LexMathSpace,
LexOpen,
LexClose,
LexComment,
LexArgument,
LexSpace,
LexNewLine,
LexOther,
LexSelf
};
lexcode_enum lexcode[256];
char const * latex_special_chars = "#$%&_{}";
/// Read TeX into data, flags give stop conditions
void mathed_parse(MathArray & data, unsigned flags);
namespace {
unsigned char getuchar(std::istream * is)
{
char c;
is->get(c);
return static_cast<unsigned char>(c);
}
const unsigned char LM_TK_OPEN = '{';
const unsigned char LM_TK_CLOSE = '}';
enum {
FLAG_BRACE = 1 << 0, // A { needed //}
FLAG_BRACE_OPT = 1 << 2, // Optional {
FLAG_BRACE_LAST = 1 << 3, // Last } ends the parsing process
FLAG_BRACK_ARG = 1 << 4, // Optional [
FLAG_RIGHT = 1 << 5, // Next right ends the parsing process
FLAG_END = 1 << 6, // Next end ends the parsing process
FLAG_BRACE_FONT = 1 << 7, // Next } closes a font
FLAG_BRACK_END = 1 << 9, // Next ] ends the parsing process
FLAG_AMPERSAND = 1 << 10, // Next & ends the parsing process
FLAG_NEWLINE = 1 << 11 // Next \\ ends the parsing process
};
///
union {
///
int i;
///
latexkeys const * l;
} yylval;
string yytext;
int yylineno;
istream * yyis;
MathTextCodes yyvarcode;
struct latex_mathenv_type {
char const * name;
char const * basename;
MathInsetTypes typ;
bool numbered;
bool ams;
};
latex_mathenv_type latex_mathenv[] = {
{"math", "math", LM_OT_SIMPLE, 0, 0},
{"equation*", "equation", LM_OT_EQUATION, 0, 0},
{"equation", "equation", LM_OT_EQUATION, 1, 0},
{"eqnarray*", "eqnarray", LM_OT_EQNARRAY, 0, 0},
{"eqnarray", "eqnarray", LM_OT_EQNARRAY, 1, 0},
{"align*", "align", LM_OT_ALIGN, 0, 1},
{"align", "align", LM_OT_ALIGN, 1, 1},
{"alignat*", "alignat", LM_OT_ALIGNAT, 0, 1},
{"alignat", "alignat", LM_OT_ALIGNAT, 1, 1},
{"multline*", "multline", LM_OT_MULTLINE, 0, 1},
{"multline", "multline", LM_OT_MULTLINE, 1, 1},
{"array", "array", LM_OT_MATRIX, 0, 1}
};
int const latex_mathenv_num = sizeof(latex_mathenv)/sizeof(latex_mathenv[0]);
void mathPrintError(string const & msg)
{
lyxerr << "Line ~" << yylineno << ": Math parse error: " << msg << endl;
}
void LexInitCodes()
{
for (int i = 0; i <= 255; ++i) {
if (isdigit(i))
lexcode[i] = LexDigit;
else if (isspace(i))
lexcode[i] = LexSpace;
else
lexcode[i] = LexAlpha;
}
lexcode['\t'] = lexcode['\f'] = lexcode[' '] = LexSpace;
lexcode['\n'] = LexNewLine;
lexcode['%'] = LexComment;
lexcode['#'] = LexArgument;
lexcode['+'] = lexcode['-'] = lexcode['*'] = lexcode['/']
= lexcode['<'] = lexcode['>'] = lexcode['='] = LexBOP;
lexcode['!'] = lexcode[','] = lexcode[':']
= lexcode[';'] = LexMathSpace;
lexcode['('] = lexcode[')'] = lexcode['|'] = lexcode['.'] =
lexcode['?'] = LexOther;
lexcode['\''] = lexcode['@'] = LexAlpha;
lexcode['['] = lexcode[']'] = lexcode['^'] = lexcode['_'] =
lexcode['&'] = LexSelf;
lexcode['\\'] = LexESC;
lexcode['{'] = LexOpen;
lexcode['}'] = LexClose;
}
unsigned char LexGetArg(unsigned char lf, bool accept_spaces = false)
{
while (yyis->good()) {
unsigned char c = getuchar(yyis);
if (c > ' ') {
if (!lf)
lf = c;
else if (c != lf) {
lyxerr << "Math parse error: unexpected '" << c << "'" << endl;
return '\0';
}
break;
}
}
unsigned char rg = 0;
if (lf == '{') rg = '}';
if (lf == '[') rg = ']';
if (lf == '(') rg = ')';
if (!rg) {
lyxerr << "Math parse error: unknown bracket '" << lf << "'" << endl;
return '\0';
}
yytext.erase();
int bcnt = 1;
do {
unsigned char c = getuchar(yyis);
if (c == lf) ++bcnt;
if (c == rg) --bcnt;
if ((c > ' ' || (c == ' ' && accept_spaces)) && bcnt > 0)
yytext += c;
} while (bcnt > 0 && yyis->good());
return rg;
}
int yylex()
{
static int init_done;
if (!init_done) LexInitCodes();
while (yyis->good()) {
unsigned char c = getuchar(yyis);
//lyxerr << "reading byte: '" << c << "' code: " << lexcode[c] << endl;
if (yyvarcode == LM_TC_TEXTRM && c == ' ') {
yylval.i = ' ';
return LM_TK_ALPHA;
} else if (lexcode[c] == LexNewLine) {
++yylineno;
continue;
} else if (lexcode[c] == LexComment) {
do {
c = getuchar(yyis);
} while (c != '\n' && yyis->good()); // eat comments
} else if (lexcode[c] == LexDigit
|| lexcode[c] == LexOther
|| lexcode[c] == LexMathSpace) {
yylval.i = c;
return LM_TK_STR;
} else if (lexcode[c] == LexAlpha) {
yylval.i = c;
return LM_TK_ALPHA;
} else if (lexcode[c] == LexBOP) {
yylval.i = c;
return LM_TK_BOP;
} else if (lexcode[c] == LexSelf) {
return c;
} else if (lexcode[c] == LexArgument) {
c = getuchar(yyis);
yylval.i = c - '0';
return LM_TK_ARGUMENT;
} else if (lexcode[c] == LexOpen) {
return LM_TK_OPEN;
} else if (lexcode[c] == LexClose) {
return LM_TK_CLOSE;
} else if (lexcode[c] == LexESC) {
c = getuchar(yyis);
if (c == '\\') {
yylval.i = -1;
return LM_TK_NEWLINE;
}
if (c == '(') {
yylval.i = LM_OT_SIMPLE;
return LM_TK_BEGIN;
}
if (c == ')') {
yylval.i = LM_OT_SIMPLE;
return LM_TK_END;
}
if (c == '[') {
yylval.i = LM_OT_EQUATION;
return LM_TK_BEGIN;
}
if (c == ']') {
yylval.i = LM_OT_EQUATION;
return LM_TK_END;
}
if (contains(latex_special_chars, c)) {
yylval.i = c;
return LM_TK_SPECIAL;
}
if (lexcode[c] == LexMathSpace) {
int i;
for (i = 0; i < 4 && static_cast<int>(c) != latex_mathspace[i][0]; ++i)
;
yylval.i = (i < 4) ? i : 0;
return LM_TK_SPACE;
}
if (lexcode[c] == LexAlpha || lexcode[c] == LexDigit) {
yytext.erase();
while (lexcode[c] == LexAlpha || lexcode[c] == LexDigit) {
yytext += c;
c = getuchar(yyis);
}
if (yyis->good())
yyis->putback(c);
lyxerr << "reading: text '" << yytext << "'\n";
latexkeys const * l = in_word_set(yytext);
if (!l)
return LM_TK_UNDEF;
if (l->token == LM_TK_BEGIN || l->token == LM_TK_END) {
LexGetArg('{');
int i = 0;
while (i < latex_mathenv_num && yytext != latex_mathenv[i].name)
++i;
yylval.i = i;
} else if (l->token == LM_TK_SPACE)
yylval.i = l->id;
else
yylval.l = l;
return l->token;
}
}
}
return 0;
}
// Accent hacks only for 0.12. Stolen from Cursor.
int accent = 0;
int nestaccent[8];
void setAccent(int ac)
{
if (ac > 0 && accent < 8)
nestaccent[accent++] = ac;
else
accent = 0; // consumed!
}
MathInset * doAccent(unsigned char c, MathTextCodes t)
{
MathInset * ac = 0;
for (int i = accent - 1; i >= 0; --i) {
if (i == accent - 1)
ac = new MathAccentInset(c, t, nestaccent[i]);
else
ac = new MathAccentInset(ac, nestaccent[i]);
}
accent = 0; // consumed!
return ac;
}
MathInset * doAccent(MathInset * p)
{
MathInset * ac = 0;
for (int i = accent - 1; i >= 0; --i) {
if (i == accent - 1)
ac = new MathAccentInset(p, nestaccent[i]);
else
ac = new MathAccentInset(ac, nestaccent[i]);
}
accent = 0; // consumed!
return ac;
}
void do_insert(MathArray & dat, MathInset * m)
{
if (accent)
dat.push_back(doAccent(m));
else
dat.push_back(m);
}
void do_insert(MathArray & dat, unsigned char ch, MathTextCodes fcode)
{
if (accent)
dat.push_back(doAccent(ch, fcode));
else
dat.push_back(ch, fcode);
}
void handle_frac(MathArray & dat, MathInsetTypes t)
{
MathFracInset * p = new MathFracInset(t);
mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
mathed_parse(p->cell(1), FLAG_BRACE | FLAG_BRACE_LAST);
dat.push_back(p);
}
MathScriptInset * lastScriptInset(MathArray & array)
{
MathInset * p = array.back_inset();
if (!p || !p->isScriptInset()) {
p = new MathScriptInset;
array.push_back(p);
}
return static_cast<MathScriptInset *>(p);
}
}
static bool curr_num;
static string curr_label;
void mathed_parse_lines(MathInset * inset, int col, bool numbered, bool outmost)
{
// save global variables
bool saved_num = curr_num;
string saved_label = curr_label;
MathGridInset * p = static_cast<MathGridInset *>(inset);
for (int row = 0; true; ++row) {
// reset global variables
curr_num = numbered;
curr_label = string();
// reading a row
int idx = p->nargs() - p->ncols();
for (int i = 0; i < col - 1; ++i, ++idx)
mathed_parse(p->cell(idx), FLAG_AMPERSAND);
mathed_parse(p->cell(idx), FLAG_NEWLINE | FLAG_END);
if (outmost) {
MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
m->numbered(row, curr_num);
m->label(row, curr_label);
}
// Hack!
// no newline
if (yylval.i != -1)
break;
p->appendRow();
}
// restore global variables
curr_num = saved_num;
curr_label = saved_label;
}
MathInset * mathed_parse()
{
MathInset * p = 0;
int t = yylex();
switch (t) {
case LM_TK_NEWCOMMAND: {
LexGetArg('{');
string name = yytext.substr(1);
int na = 0;
unsigned char const c = yyis->peek();
if (c == '[') {
LexGetArg('[');
na = atoi(yytext.c_str());
}
p = new MathMacroTemplate(name, na);
mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
lyxerr << "LM_TK_NEWCOMMAND: name: " << name << " na: " << na << "\n";
break;
}
case LM_TK_BEGIN: {
int i = yylval.i;
lyxerr << "reading math environment " << i << " "
<< latex_mathenv[i].name << "\n";
MathInsetTypes typ = latex_mathenv[i].typ;
p = new MathMatrixInset(typ);
switch (typ) {
case LM_OT_SIMPLE: {
curr_num = latex_mathenv[i].numbered;
curr_label = string();
mathed_parse(p->cell(0), 0);
MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
m->numbered(0, curr_num);
m->label(0, curr_label);
break;
}
case LM_OT_EQUATION: {
curr_num = latex_mathenv[i].numbered;
curr_label = string();
mathed_parse(p->cell(0), FLAG_END);
MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
m->numbered(0, curr_num);
m->label(0, curr_label);
break;
}
case LM_OT_EQNARRAY: {
mathed_parse_lines(p, 3, latex_mathenv[i].numbered, true);
break;
}
case LM_OT_ALIGNAT: {
LexGetArg('{');
//int c = atoi(yytext.c_str());
lyxerr << "LM_OT_ALIGNAT: not implemented\n";
mathed_parse_lines(p, 2, latex_mathenv[i].numbered, true);
lyxerr << "LM_OT_ALIGNAT: par: " << *p << "\n";
break;
}
default:
lyxerr << "1: unknown math environment: " << typ << "\n";
}
p->SetName(latex_mathenv[i].basename);
break;
}
default:
lyxerr << "2 unknown math environment: " << t << "\n";
}
return p;
}
void mathed_parse(MathArray & array, unsigned flags)
{
int t = yylex();
int tprev = 0;
bool panic = false;
static int plevel = -1;
yyvarcode = LM_TC_VAR;
int brace = 0;
int acc_brace = 0;
int acc_braces[8];
++plevel;
while (t) {
//lyxerr << "t: " << t << " flags: " << flags;
//array.dump(lyxerr);
//lyxerr << "\n";
if ((flags & FLAG_BRACE) && t != LM_TK_OPEN) {
if (!(flags & FLAG_BRACK_ARG) || t != '[') {
mathPrintError(
"Expected {. Maybe you forgot to enclose an argument in {}");
panic = true;
break;
}
}
switch (t) {
case LM_TK_ALPHA:
do_insert(array, yylval.i, yyvarcode);
break;
case LM_TK_ARGUMENT:
array.push_back(new MathMacroArgument(yylval.i));
break;
case LM_TK_SPECIAL:
array.push_back(yylval.i, LM_TC_SPECIAL);
break;
case LM_TK_STR:
do_insert(array, yylval.i, LM_TC_CONST);
break;
case LM_TK_OPEN:
++brace;
if (accent && tprev == LM_TK_ACCENT) {
acc_braces[acc_brace++] = brace;
break;
}
if (flags & FLAG_BRACE_OPT) {
flags &= ~FLAG_BRACE_OPT;
flags |= FLAG_BRACE;
}
if (flags & FLAG_BRACE)
flags &= ~FLAG_BRACE;
else
array.push_back('{', LM_TC_TEX);
break;
case LM_TK_CLOSE:
--brace;
if (brace < 0) {
mathPrintError("Unmatching braces");
panic = true;
break;
}
if (acc_brace && brace == acc_braces[acc_brace - 1] - 1) {
--acc_brace;
break;
}
if (flags & FLAG_BRACE_FONT) {
yyvarcode = LM_TC_VAR;
flags &= ~FLAG_BRACE_FONT;
break;
}
if (brace == 0 && (flags & FLAG_BRACE_LAST)) {
--plevel;
return;
}
array.push_back('}', LM_TC_TEX);
break;
case '[':
if (flags & FLAG_BRACK_ARG) {
flags &= ~FLAG_BRACK_ARG;
unsigned char const rg = LexGetArg('[');
if (rg != ']') {
mathPrintError("Expected ']'");
panic = true;
break;
}
} else
array.push_back('[', LM_TC_CONST);
break;
case ']':
if (flags & FLAG_BRACK_END) {
--plevel;
return;
}
array.push_back(']', LM_TC_CONST);
break;
case '^':
{
MathArray ar;
mathed_parse(ar, FLAG_BRACE_OPT | FLAG_BRACE_LAST);
MathScriptInset * p = lastScriptInset(array);
p->setData(ar, 0);
p->up(true);
break;
}
case '_':
{
MathArray ar;
mathed_parse(ar, FLAG_BRACE_OPT | FLAG_BRACE_LAST);
MathScriptInset * p = lastScriptInset(array);
p->setData(ar, 1);
p->down(true);
break;
}
case LM_TK_LIMIT:
{
MathScriptInset * p = lastScriptInset(array);
if (p)
p->limits(yylval.l->id ? 1 : -1);
break;
}
case '&':
{
if (flags & FLAG_AMPERSAND) {
flags &= ~FLAG_AMPERSAND;
--plevel;
return;
}
lyxerr << "found tab unexpectedly, array: '" << array << "'\n";
break;
}
case LM_TK_NEWLINE:
{
if (flags & FLAG_NEWLINE) {
flags &= ~FLAG_NEWLINE;
--plevel;
return;
}
lyxerr << "found newline unexpectedly, array: '" << array << "'\n";
break;
}
case LM_TK_BIGSYM:
{
array.push_back(new MathBigopInset(yylval.l->name, yylval.l->id));
break;
}
case LM_TK_SYM:
if (yylval.l->id < 256) {
MathTextCodes tc = MathIsBOPS(yylval.l->id) ? LM_TC_BOPS: LM_TC_SYMB;
do_insert(array, yylval.l->id, tc);
} else
do_insert(array, new MathFuncInset(yylval.l->name));
break;
case LM_TK_BOP:
do_insert(array, yylval.i, LM_TC_BOP);
break;
case LM_TK_SPACE:
if (yylval.i >= 0)
array.push_back(new MathSpaceInset(yylval.i));
break;
case LM_TK_DOTS:
array.push_back(new MathDotsInset(yylval.l->name, yylval.l->id));
break;
case LM_TK_CHOOSE:
handle_frac(array, LM_OT_ATOP);
break;
case LM_TK_STACK:
handle_frac(array, LM_OT_STACKREL);
break;
case LM_TK_FRAC:
handle_frac(array, LM_OT_FRAC);
break;
case LM_TK_SQRT:
{
unsigned char c = getuchar(yyis);
if (c == '[') {
MathRootInset * rt = new MathRootInset;
mathed_parse(rt->cell(0), FLAG_BRACK_END);
mathed_parse(rt->cell(1), FLAG_BRACE | FLAG_BRACE_LAST);
array.push_back(rt);
} else {
yyis->putback(c);
MathSqrtInset * sq = new MathSqrtInset;
mathed_parse(sq->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
array.push_back(sq);
}
break;
}
case LM_TK_LEFT:
{
int ld = yylex();
if (ld == LM_TK_SYM)
ld = yylval.l->id;
else if (ld == LM_TK_STR || ld == LM_TK_BOP || ld == LM_TK_SPECIAL)
ld = yylval.i;
MathArray ar;
mathed_parse(ar, FLAG_RIGHT);
int rd = yylex();
if (rd == LM_TK_SYM)
rd = yylval.l->id;
else if (rd == LM_TK_STR || rd == LM_TK_BOP || rd == LM_TK_SPECIAL)
rd = yylval.i;
MathDelimInset * dl = new MathDelimInset(ld, rd);
dl->setData(ar, 0);
array.push_back(dl);
break;
}
case LM_TK_RIGHT:
if (flags & FLAG_RIGHT) {
--plevel;
return;
}
mathPrintError("Unmatched right delimiter");
// panic = true;
break;
case LM_TK_FONT:
yyvarcode = static_cast<MathTextCodes>(yylval.l->id);
flags |= (FLAG_BRACE | FLAG_BRACE_FONT);
break;
case LM_TK_STY:
{
lyxerr << "LM_TK_STY not implemented\n";
//MathArray tmp = array;
//MathSizeInset * p = new MathSizeInset(MathStyles(yylval.l->id));
//array.push_back(p);
//mathed_parse(p->cell(0), FLAG_BRACE_FONT);
break;
}
case LM_TK_WIDE:
{
MathDecorationInset * sq = new MathDecorationInset(yylval.l->id);
mathed_parse(sq->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
array.push_back(sq);
break;
}
case LM_TK_ACCENT:
setAccent(yylval.l->id);
break;
case LM_TK_NONUM:
curr_num = false;
break;
case LM_TK_PMOD:
case LM_TK_FUNC:
if (accent)
array.push_back(t, LM_TC_CONST);
else
array.push_back(new MathFuncInset(yylval.l->name));
break;
case LM_TK_FUNCLIM:
array.push_back(new MathFuncInset(yylval.l->name, LM_OT_FUNCLIM));
break;
case LM_TK_UNDEF:
if (MathMacroTable::hasTemplate(yytext)) {
MathMacro * m = MathMacroTable::cloneTemplate(yytext);
for (int i = 0; i < m->nargs(); ++i)
mathed_parse(m->cell(i), FLAG_BRACE_OPT | FLAG_BRACE_LAST);
do_insert(array, m);
m->Metrics(LM_ST_TEXT);
} else
do_insert(array, new MathFuncInset(yytext, LM_OT_UNDEF));
break;
case LM_TK_END:
--plevel;
return;
case LM_TK_BEGIN:
{
int i = yylval.i;
MathInsetTypes typ = latex_mathenv[i].typ;
if (typ == LM_OT_MATRIX) {
string valign = "\0";
unsigned char rg = LexGetArg(0);
if (rg == ']') {
valign = yytext;
rg = LexGetArg('{');
}
string halign = yytext;
MathArrayInset * mm = new MathArrayInset(halign.size(), 1);
valign += 'c';
mm->valign(valign[0]);
mm->halign(halign);
mathed_parse_lines(mm, halign.size(), latex_mathenv[i].numbered, false);
do_insert(array, mm);
//lyxerr << "read matrix " << *mm << "\n";
break;
} else
lyxerr << "unknow math inset " << typ << "\n";
break;
}
case LM_TK_MACRO:
do_insert(array, MathMacroTable::cloneTemplate(yylval.l->name));
break;
case LM_TK_LABEL:
{
unsigned char const rg = LexGetArg('\0', true);
if (rg != '}') {
mathPrintError("Expected '{'");
// debug info
lyxerr << "[" << yytext << "]" << endl;
panic = true;
break;
}
//lyxerr << " setting label to " << yytext << "\n";
curr_label = yytext;
break;
}
default:
mathPrintError("Unrecognized token");
lyxerr << "[" << t << " " << yytext << "]" << endl;
break;
} // end of big switch
tprev = t;
if (panic) {
lyxerr << " Math Panic, expect problems!" << endl;
// Search for the end command.
do {
t = yylex();
} while (t != LM_TK_END && t);
} else
t = yylex();
if (flags & FLAG_BRACE_OPT) {
flags &= ~FLAG_BRACE_OPT;
break;
}
}
--plevel;
}
MathInset * mathed_parse(istream & is)
{
yyis = &is;
yylineno = 0;
return mathed_parse();
}
MathInset * mathed_parse(LyXLex & lex)
{
yyis = &lex.getStream();
yylineno = lex.GetLineNo();
MathInset * p = mathed_parse();
// Update line number
lex.setLineNo(yylineno);
// reading of end_inset
while (lex.IsOK()) {
lex.nextToken();
if (lex.GetString() == "\\end_inset")
break;
lyxerr << "InsetFormula::Read: Garbage before \\end_inset,"
" or missing \\end_inset!" << endl;
}
return p;
}
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