in ext/scintilla/lexers/LexLaTeX.cxx [186:461]
void SCI_METHOD LexerLaTeX::Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) {
// startPos is assumed to be the first character of a line
Accessor styler(pAccess, &props);
styler.StartAt(startPos);
int mode = getMode(styler.GetLine(startPos) - 1);
int state = initStyle;
if (state == SCE_L_ERROR || state == SCE_L_SHORTCMD || state == SCE_L_SPECIAL) // should not happen
latexStateReset(mode, state);
char chNext = styler.SafeGetCharAt(startPos);
char chVerbatimDelim = '\0';
styler.StartSegment(startPos);
Sci_Position lengthDoc = startPos + length;
for (Sci_Position i = startPos; i < lengthDoc; i++) {
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
if (styler.IsLeadByte(ch)) {
i++;
chNext = styler.SafeGetCharAt(i + 1);
continue;
}
if (ch == '\r' || ch == '\n')
setMode(styler.GetLine(i), mode);
switch (state) {
case SCE_L_DEFAULT :
switch (ch) {
case '\\' :
styler.ColourTo(i - 1, state);
if (latexIsLetter(chNext)) {
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)) {
styler.ColourTo(i + 1, SCE_L_SHORTCMD);
if (chNext == '(') {
mode = 1;
state = SCE_L_MATH;
} else if (chNext == '[') {
mode = 2;
state = SCE_L_MATH2;
}
i++;
chNext = styler.SafeGetCharAt(i + 1);
}
break;
case '$' :
styler.ColourTo(i - 1, state);
if (chNext == '$') {
styler.ColourTo(i + 1, SCE_L_SHORTCMD);
mode = 2;
state = SCE_L_MATH2;
i++;
chNext = styler.SafeGetCharAt(i + 1);
} else {
styler.ColourTo(i, SCE_L_SHORTCMD);
mode = 1;
state = SCE_L_MATH;
}
break;
case '%' :
styler.ColourTo(i - 1, state);
state = SCE_L_COMMENT;
break;
}
break;
// These 3 will never be reached.
case SCE_L_ERROR:
case SCE_L_SPECIAL:
case SCE_L_SHORTCMD:
break;
case SCE_L_COMMAND :
if (!latexIsLetter(chNext)) {
styler.ColourTo(i, state);
if (latexNextNotBlankIs(i + 1, styler, '[' )) {
state = SCE_L_CMDOPT;
} else if (latexLastWordIs(i, styler, "\\begin")) {
state = SCE_L_TAG;
} else if (latexLastWordIs(i, styler, "\\end")) {
state = SCE_L_TAG2;
} else if (latexLastWordIs(i, styler, "\\verb") && chNext != '*' && chNext != ' ') {
chVerbatimDelim = chNext;
state = SCE_L_VERBATIM;
} else {
latexStateReset(mode, state);
}
}
break;
case SCE_L_CMDOPT :
if (ch == ']') {
styler.ColourTo(i, state);
latexStateReset(mode, state);
}
break;
case SCE_L_TAG :
if (latexIsTagValid(i, lengthDoc, styler)) {
styler.ColourTo(i, state);
latexStateReset(mode, state);
if (latexLastWordIs(i, styler, "{verbatim}")) {
state = SCE_L_VERBATIM;
} else if (latexLastWordIs(i, styler, "{comment}")) {
state = SCE_L_COMMENT2;
} else if (latexLastWordIs(i, styler, "{math}") && mode == 0) {
mode = 1;
state = SCE_L_MATH;
} else if (latexLastWordIsMathEnv(i, styler) && mode == 0) {
mode = 2;
state = SCE_L_MATH2;
}
} else {
styler.ColourTo(i, SCE_L_ERROR);
latexStateReset(mode, state);
ch = styler.SafeGetCharAt(i);
if (ch == '\r' || ch == '\n') setMode(styler.GetLine(i), mode);
}
chNext = styler.SafeGetCharAt(i+1);
break;
case SCE_L_TAG2 :
if (latexIsTagValid(i, lengthDoc, styler)) {
styler.ColourTo(i, state);
latexStateReset(mode, state);
} else {
styler.ColourTo(i, SCE_L_ERROR);
latexStateReset(mode, state);
ch = styler.SafeGetCharAt(i);
if (ch == '\r' || ch == '\n') setMode(styler.GetLine(i), mode);
}
chNext = styler.SafeGetCharAt(i+1);
break;
case SCE_L_MATH :
switch (ch) {
case '\\' :
styler.ColourTo(i - 1, state);
if (latexIsLetter(chNext)) {
Sci_Position match = i + 3;
if (latexLastWordIs(match, styler, "\\end")) {
match++;
if (latexIsTagValid(match, lengthDoc, styler)) {
if (latexLastWordIs(match, styler, "{math}"))
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 '$' :
styler.ColourTo(i - 1, state);
styler.ColourTo(i, SCE_L_SHORTCMD);
mode = 0;
state = SCE_L_DEFAULT;
break;
case '%' :
styler.ColourTo(i - 1, state);
state = SCE_L_COMMENT;
break;
}
break;
case SCE_L_MATH2 :
switch (ch) {
case '\\' :
styler.ColourTo(i - 1, state);
if (latexIsLetter(chNext)) {
Sci_Position match = i + 3;
if (latexLastWordIs(match, styler, "\\end")) {
match++;
if (latexIsTagValid(match, lengthDoc, styler)) {
if (latexLastWordIsMathEnv(match, styler))
mode = 0;
}
}
state = SCE_L_COMMAND;
} else if (latexIsSpecial(chNext)) {
styler.ColourTo(i + 1, SCE_L_SPECIAL);
i++;
chNext = styler.SafeGetCharAt(i + 1);
} else if (chNext == '\r' || chNext == '\n') {
styler.ColourTo(i, SCE_L_ERROR);
} else if (IsASCII(chNext)) {
if (chNext == ']') {
mode = 0;
state = SCE_L_DEFAULT;
}
styler.ColourTo(i + 1, SCE_L_SHORTCMD);
i++;
chNext = styler.SafeGetCharAt(i + 1);
}
break;
case '$' :
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 == '\\') {
Sci_Position 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 == '\\') {
Sci_Position 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();
}