540 lines
15 KiB
C++
540 lines
15 KiB
C++
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// Scintilla source code edit control
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/** @file LexLaTeX.cxx
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** Lexer for LaTeX2e.
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**/
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// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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// Modified by G. HU in 2013. Added folding, syntax highting inside math environments, and changed some minor behaviors.
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include <vector>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "PropSetSimple.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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#include "LexerBase.h"
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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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using namespace std;
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struct latexFoldSave {
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latexFoldSave() : structLev(0) {
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for (int i = 0; i < 8; ++i) openBegins[i] = 0;
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}
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latexFoldSave(const latexFoldSave &save) : structLev(save.structLev) {
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for (int i = 0; i < 8; ++i) openBegins[i] = save.openBegins[i];
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}
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int openBegins[8];
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int structLev;
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};
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class LexerLaTeX : public LexerBase {
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private:
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vector<int> modes;
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void setMode(int line, int mode) {
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if (line >= static_cast<int>(modes.size())) modes.resize(line + 1, 0);
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modes[line] = mode;
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}
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int getMode(int line) {
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if (line >= 0 && line < static_cast<int>(modes.size())) return modes[line];
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return 0;
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}
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void truncModes(int numLines) {
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if (static_cast<int>(modes.size()) > numLines * 2 + 256)
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modes.resize(numLines + 128);
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}
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vector<latexFoldSave> saves;
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void setSave(int line, const latexFoldSave &save) {
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if (line >= static_cast<int>(saves.size())) saves.resize(line + 1);
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saves[line] = save;
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}
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void getSave(int line, latexFoldSave &save) {
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if (line >= 0 && line < static_cast<int>(saves.size())) save = saves[line];
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else {
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save.structLev = 0;
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for (int i = 0; i < 8; ++i) save.openBegins[i] = 0;
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}
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}
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void truncSaves(int numLines) {
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if (static_cast<int>(saves.size()) > numLines * 2 + 256)
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saves.resize(numLines + 128);
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}
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public:
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static ILexer *LexerFactoryLaTeX() {
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return new LexerLaTeX();
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}
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void SCI_METHOD Lex(unsigned int startPos, int length, int initStyle, IDocument *pAccess);
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void SCI_METHOD Fold(unsigned int startPos, int length, int initStyle, IDocument *pAccess);
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};
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static bool latexIsSpecial(int ch) {
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return (ch == '#') || (ch == '$') || (ch == '%') || (ch == '&') || (ch == '_') ||
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(ch == '{') || (ch == '}') || (ch == ' ');
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}
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static bool latexIsBlank(int ch) {
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return (ch == ' ') || (ch == '\t');
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}
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static bool latexIsBlankAndNL(int ch) {
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return (ch == ' ') || (ch == '\t') || (ch == '\r') || (ch == '\n');
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}
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static bool latexIsLetter(int ch) {
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return isascii(ch) && isalpha(ch);
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}
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static bool latexIsTagValid(int &i, int l, Accessor &styler) {
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while (i < l) {
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if (styler.SafeGetCharAt(i) == '{') {
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while (i < l) {
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i++;
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if (styler.SafeGetCharAt(i) == '}') {
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return true;
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} else if (!latexIsLetter(styler.SafeGetCharAt(i)) &&
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styler.SafeGetCharAt(i)!='*') {
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return false;
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}
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}
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} else if (!latexIsBlank(styler.SafeGetCharAt(i))) {
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return false;
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}
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i++;
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}
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return false;
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}
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static bool latexNextNotBlankIs(int i, Accessor &styler, char needle) {
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char ch;
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while (i < styler.Length()) {
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ch = styler.SafeGetCharAt(i);
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if (!latexIsBlankAndNL(ch) && ch != '*') {
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if (ch == needle)
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return true;
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else
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return false;
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}
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i++;
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}
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return false;
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}
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static bool latexLastWordIs(int start, Accessor &styler, const char *needle) {
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unsigned int i = 0;
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unsigned int l = static_cast<unsigned int>(strlen(needle));
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int ini = start-l+1;
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char s[32];
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while (i < l && i < 31) {
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s[i] = styler.SafeGetCharAt(ini + i);
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i++;
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}
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s[i] = '\0';
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return (strcmp(s, needle) == 0);
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}
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static bool latexLastWordIsMathEnv(int pos, Accessor &styler) {
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int i, j;
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char s[32];
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const char *mathEnvs[] = { "align", "alignat", "flalign", "gather",
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"multiline", "displaymath", "eqnarray", "equation" };
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if (styler.SafeGetCharAt(pos) != '}') return false;
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for (i = pos - 1; i >= 0; --i) {
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if (styler.SafeGetCharAt(i) == '{') break;
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if (pos - i >= 20) return false;
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}
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if (i < 0 || i == pos - 1) return false;
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++i;
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for (j = 0; i + j < pos; ++j)
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s[j] = styler.SafeGetCharAt(i + j);
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s[j] = '\0';
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if (j == 0) return false;
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if (s[j - 1] == '*') s[--j] = '\0';
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for (i = 0; i < static_cast<int>(sizeof(mathEnvs) / sizeof(const char *)); ++i)
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if (strcmp(s, mathEnvs[i]) == 0) return true;
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return false;
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}
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static inline void latexStateReset(int &mode, int &state) {
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switch (mode) {
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case 1: state = SCE_L_MATH; break;
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case 2: state = SCE_L_MATH2; break;
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default: state = SCE_L_DEFAULT; break;
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}
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}
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// There are cases not handled correctly, like $abcd\textrm{what is $x+y$}z+w$.
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// But I think it's already good enough.
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void SCI_METHOD LexerLaTeX::Lex(unsigned int startPos, int length, int initStyle, IDocument *pAccess) {
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// startPos is assumed to be the first character of a line
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Accessor styler(pAccess, &props);
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styler.StartAt(startPos);
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int mode = getMode(styler.GetLine(startPos) - 1);
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int state = initStyle;
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if (state == SCE_L_ERROR || state == SCE_L_SHORTCMD || state == SCE_L_SPECIAL) // should not happen
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latexStateReset(mode, state);
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char chNext = styler.SafeGetCharAt(startPos);
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char chVerbatimDelim = '\0';
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styler.StartSegment(startPos);
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int lengthDoc = startPos + length;
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for (int i = startPos; i < lengthDoc; i++) {
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char ch = chNext;
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chNext = styler.SafeGetCharAt(i + 1);
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if (styler.IsLeadByte(ch)) {
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i++;
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chNext = styler.SafeGetCharAt(i + 1);
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continue;
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}
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if (ch == '\r' || ch == '\n')
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setMode(styler.GetLine(i), mode);
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switch (state) {
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case SCE_L_DEFAULT :
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switch (ch) {
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case '\\' :
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styler.ColourTo(i - 1, state);
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if (latexIsLetter(chNext)) {
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state = SCE_L_COMMAND;
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} else if (latexIsSpecial(chNext)) {
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styler.ColourTo(i + 1, SCE_L_SPECIAL);
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i++;
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chNext = styler.SafeGetCharAt(i + 1);
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} else if (chNext == '\r' || chNext == '\n') {
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styler.ColourTo(i, SCE_L_ERROR);
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} else if (isascii(chNext)) {
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styler.ColourTo(i + 1, SCE_L_SHORTCMD);
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if (chNext == '(') {
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mode = 1;
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state = SCE_L_MATH;
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} else if (chNext == '[') {
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mode = 2;
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state = SCE_L_MATH2;
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}
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i++;
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chNext = styler.SafeGetCharAt(i + 1);
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}
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break;
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case '$' :
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styler.ColourTo(i - 1, state);
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if (chNext == '$') {
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styler.ColourTo(i + 1, SCE_L_SHORTCMD);
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mode = 2;
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state = SCE_L_MATH2;
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i++;
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chNext = styler.SafeGetCharAt(i + 1);
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} else {
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styler.ColourTo(i, SCE_L_SHORTCMD);
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mode = 1;
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state = SCE_L_MATH;
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}
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break;
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case '%' :
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styler.ColourTo(i - 1, state);
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state = SCE_L_COMMENT;
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break;
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}
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break;
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// These 3 will never be reached.
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case SCE_L_ERROR:
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case SCE_L_SPECIAL:
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case SCE_L_SHORTCMD:
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break;
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case SCE_L_COMMAND :
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if (!latexIsLetter(chNext)) {
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styler.ColourTo(i, state);
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if (latexNextNotBlankIs(i + 1, styler, '[' )) {
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state = SCE_L_CMDOPT;
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} else if (latexLastWordIs(i, styler, "\\begin")) {
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state = SCE_L_TAG;
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} else if (latexLastWordIs(i, styler, "\\end")) {
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state = SCE_L_TAG2;
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} else if (latexLastWordIs(i, styler, "\\verb") && chNext != '*' && chNext != ' ') {
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chVerbatimDelim = chNext;
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state = SCE_L_VERBATIM;
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} else {
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latexStateReset(mode, state);
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}
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}
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break;
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case SCE_L_CMDOPT :
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if (ch == ']') {
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styler.ColourTo(i, state);
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latexStateReset(mode, state);
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}
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break;
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case SCE_L_TAG :
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if (latexIsTagValid(i, lengthDoc, styler)) {
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styler.ColourTo(i, state);
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latexStateReset(mode, state);
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if (latexLastWordIs(i, styler, "{verbatim}")) {
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state = SCE_L_VERBATIM;
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} else if (latexLastWordIs(i, styler, "{comment}")) {
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state = SCE_L_COMMENT2;
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} else if (latexLastWordIs(i, styler, "{math}") && mode == 0) {
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mode = 1;
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state = SCE_L_MATH;
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} else if (latexLastWordIsMathEnv(i, styler) && mode == 0) {
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mode = 2;
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state = SCE_L_MATH2;
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}
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} else {
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styler.ColourTo(i, SCE_L_ERROR);
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latexStateReset(mode, state);
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ch = styler.SafeGetCharAt(i);
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if (ch == '\r' || ch == '\n') setMode(styler.GetLine(i), mode);
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}
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chNext = styler.SafeGetCharAt(i+1);
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break;
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case SCE_L_TAG2 :
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if (latexIsTagValid(i, lengthDoc, styler)) {
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styler.ColourTo(i, state);
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latexStateReset(mode, state);
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} else {
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styler.ColourTo(i, SCE_L_ERROR);
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latexStateReset(mode, state);
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ch = styler.SafeGetCharAt(i);
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if (ch == '\r' || ch == '\n') setMode(styler.GetLine(i), mode);
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}
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chNext = styler.SafeGetCharAt(i+1);
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break;
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case SCE_L_MATH :
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switch (ch) {
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case '\\' :
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styler.ColourTo(i - 1, state);
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if (latexIsLetter(chNext)) {
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int match = i + 3;
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if (latexLastWordIs(match, styler, "\\end")) {
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match++;
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if (latexIsTagValid(match, lengthDoc, styler)) {
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if (latexLastWordIs(match, styler, "{math}"))
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mode = 0;
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}
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}
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state = SCE_L_COMMAND;
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} else if (latexIsSpecial(chNext)) {
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styler.ColourTo(i + 1, SCE_L_SPECIAL);
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i++;
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chNext = styler.SafeGetCharAt(i + 1);
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} else if (chNext == '\r' || chNext == '\n') {
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styler.ColourTo(i, SCE_L_ERROR);
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} else if (isascii(chNext)) {
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if (chNext == ')') {
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mode = 0;
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state = SCE_L_DEFAULT;
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}
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styler.ColourTo(i + 1, SCE_L_SHORTCMD);
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i++;
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chNext = styler.SafeGetCharAt(i + 1);
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}
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break;
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case '$' :
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styler.ColourTo(i - 1, state);
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styler.ColourTo(i, SCE_L_SHORTCMD);
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mode = 0;
|
||
|
|
state = SCE_L_DEFAULT;
|
||
|
|
break;
|
||
|
|
case '%' :
|
||
|
|
styler.ColourTo(i - 1, state);
|
||
|
|
state = SCE_L_COMMENT;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case SCE_L_MATH2 :
|
||
|
|
switch (ch) {
|
||
|
|
case '\\' :
|
||
|
|
styler.ColourTo(i - 1, state);
|
||
|
|
if (latexIsLetter(chNext)) {
|
||
|
|
int match = i + 3;
|
||
|
|
if (latexLastWordIs(match, styler, "\\end")) {
|
||
|
|
match++;
|
||
|
|
if (latexIsTagValid(match, lengthDoc, styler)) {
|
||
|
|
if (latexLastWordIsMathEnv(match, styler))
|
||
|
|
mode = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
state = SCE_L_COMMAND;
|
||
|
|
} else if (latexIsSpecial(chNext)) {
|
||
|
|
styler.ColourTo(i + 1, SCE_L_SPECIAL);
|
||
|
|
i++;
|
||
|
|
chNext = styler.SafeGetCharAt(i + 1);
|
||
|
|
} else if (chNext == '\r' || chNext == '\n') {
|
||
|
|
styler.ColourTo(i, SCE_L_ERROR);
|
||
|
|
} else if (isascii(chNext)) {
|
||
|
|
if (chNext == ']') {
|
||
|
|
mode = 0;
|
||
|
|
state = SCE_L_DEFAULT;
|
||
|
|
}
|
||
|
|
styler.ColourTo(i + 1, SCE_L_SHORTCMD);
|
||
|
|
i++;
|
||
|
|
chNext = styler.SafeGetCharAt(i + 1);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case '$' :
|
||
|
|
styler.ColourTo(i - 1, state);
|
||
|
|
if (chNext == '$') {
|
||
|
|
styler.ColourTo(i + 1, SCE_L_SHORTCMD);
|
||
|
|
i++;
|
||
|
|
chNext = styler.SafeGetCharAt(i + 1);
|
||
|
|
mode = 0;
|
||
|
|
state = SCE_L_DEFAULT;
|
||
|
|
} else { // This may not be an error, e.g. \begin{equation}\text{$a$}\end{equation}
|
||
|
|
styler.ColourTo(i, SCE_L_SHORTCMD);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case '%' :
|
||
|
|
styler.ColourTo(i - 1, state);
|
||
|
|
state = SCE_L_COMMENT;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case SCE_L_COMMENT :
|
||
|
|
if (ch == '\r' || ch == '\n') {
|
||
|
|
styler.ColourTo(i - 1, state);
|
||
|
|
latexStateReset(mode, state);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case SCE_L_COMMENT2 :
|
||
|
|
if (ch == '\\') {
|
||
|
|
int match = i + 3;
|
||
|
|
if (latexLastWordIs(match, styler, "\\end")) {
|
||
|
|
match++;
|
||
|
|
if (latexIsTagValid(match, lengthDoc, styler)) {
|
||
|
|
if (latexLastWordIs(match, styler, "{comment}")) {
|
||
|
|
styler.ColourTo(i - 1, state);
|
||
|
|
state = SCE_L_COMMAND;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case SCE_L_VERBATIM :
|
||
|
|
if (ch == '\\') {
|
||
|
|
int match = i + 3;
|
||
|
|
if (latexLastWordIs(match, styler, "\\end")) {
|
||
|
|
match++;
|
||
|
|
if (latexIsTagValid(match, lengthDoc, styler)) {
|
||
|
|
if (latexLastWordIs(match, styler, "{verbatim}")) {
|
||
|
|
styler.ColourTo(i - 1, state);
|
||
|
|
state = SCE_L_COMMAND;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else if (chNext == chVerbatimDelim) {
|
||
|
|
styler.ColourTo(i + 1, state);
|
||
|
|
latexStateReset(mode, state);
|
||
|
|
chVerbatimDelim = '\0';
|
||
|
|
i++;
|
||
|
|
chNext = styler.SafeGetCharAt(i + 1);
|
||
|
|
} else if (chVerbatimDelim != '\0' && (ch == '\n' || ch == '\r')) {
|
||
|
|
styler.ColourTo(i, SCE_L_ERROR);
|
||
|
|
latexStateReset(mode, state);
|
||
|
|
chVerbatimDelim = '\0';
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (lengthDoc == styler.Length()) truncModes(styler.GetLine(lengthDoc - 1));
|
||
|
|
styler.ColourTo(lengthDoc - 1, state);
|
||
|
|
styler.Flush();
|
||
|
|
}
|
||
|
|
|
||
|
|
static int latexFoldSaveToInt(const latexFoldSave &save) {
|
||
|
|
int sum = 0;
|
||
|
|
for (int i = 0; i <= save.structLev; ++i)
|
||
|
|
sum += save.openBegins[i];
|
||
|
|
return ((sum + save.structLev + SC_FOLDLEVELBASE) & SC_FOLDLEVELNUMBERMASK);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Change folding state while processing a line
|
||
|
|
// Return the level before the first relevant command
|
||
|
|
void SCI_METHOD LexerLaTeX::Fold(unsigned int startPos, int length, int, IDocument *pAccess) {
|
||
|
|
const char *structWords[7] = {"part", "chapter", "section", "subsection",
|
||
|
|
"subsubsection", "paragraph", "subparagraph"};
|
||
|
|
Accessor styler(pAccess, &props);
|
||
|
|
unsigned int endPos = startPos + length;
|
||
|
|
int curLine = styler.GetLine(startPos);
|
||
|
|
latexFoldSave save;
|
||
|
|
getSave(curLine - 1, save);
|
||
|
|
do {
|
||
|
|
char ch, buf[16];
|
||
|
|
int i, j, lev = -1;
|
||
|
|
bool needFold = false;
|
||
|
|
for (i = static_cast<int>(startPos); i < static_cast<int>(endPos); ++i) {
|
||
|
|
ch = styler.SafeGetCharAt(i);
|
||
|
|
if (ch == '\r' || ch == '\n') break;
|
||
|
|
if (ch != '\\' || styler.StyleAt(i) != SCE_L_COMMAND) continue;
|
||
|
|
for (j = 0; j < 15 && i + 1 < static_cast<int>(endPos); ++j, ++i) {
|
||
|
|
buf[j] = styler.SafeGetCharAt(i + 1);
|
||
|
|
if (!latexIsLetter(buf[j])) break;
|
||
|
|
}
|
||
|
|
buf[j] = '\0';
|
||
|
|
if (strcmp(buf, "begin") == 0) {
|
||
|
|
if (lev < 0) lev = latexFoldSaveToInt(save);
|
||
|
|
++save.openBegins[save.structLev];
|
||
|
|
needFold = true;
|
||
|
|
}
|
||
|
|
else if (strcmp(buf, "end") == 0) {
|
||
|
|
while (save.structLev > 0 && save.openBegins[save.structLev] == 0)
|
||
|
|
--save.structLev;
|
||
|
|
if (lev < 0) lev = latexFoldSaveToInt(save);
|
||
|
|
if (save.openBegins[save.structLev] > 0) --save.openBegins[save.structLev];
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
for (j = 0; j < 7; ++j)
|
||
|
|
if (strcmp(buf, structWords[j]) == 0) break;
|
||
|
|
if (j >= 7) continue;
|
||
|
|
save.structLev = j; // level before the command
|
||
|
|
for (j = save.structLev + 1; j < 8; ++j) {
|
||
|
|
save.openBegins[save.structLev] += save.openBegins[j];
|
||
|
|
save.openBegins[j] = 0;
|
||
|
|
}
|
||
|
|
if (lev < 0) lev = latexFoldSaveToInt(save);
|
||
|
|
++save.structLev; // level after the command
|
||
|
|
needFold = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (lev < 0) lev = latexFoldSaveToInt(save);
|
||
|
|
if (needFold) lev |= SC_FOLDLEVELHEADERFLAG;
|
||
|
|
styler.SetLevel(curLine, lev);
|
||
|
|
setSave(curLine, save);
|
||
|
|
++curLine;
|
||
|
|
startPos = styler.LineStart(curLine);
|
||
|
|
if (static_cast<int>(startPos) == styler.Length()) {
|
||
|
|
lev = latexFoldSaveToInt(save);
|
||
|
|
styler.SetLevel(curLine, lev);
|
||
|
|
setSave(curLine, save);
|
||
|
|
truncSaves(curLine);
|
||
|
|
}
|
||
|
|
} while (startPos < endPos);
|
||
|
|
styler.Flush();
|
||
|
|
}
|
||
|
|
|
||
|
|
static const char *const emptyWordListDesc[] = {
|
||
|
|
0
|
||
|
|
};
|
||
|
|
|
||
|
|
LexerModule lmLatex(SCLEX_LATEX, LexerLaTeX::LexerFactoryLaTeX, "latex", emptyWordListDesc);
|