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// Scintilla source code edit control
/** @file LexPO.cxx
** Lexer for GetText Translation (PO) files.
**/
// Copyright 2012 by Colomban Wendling <ban@herbesfolles.org>
// The License.txt file describes the conditions under which this software may be distributed.
// see https://www.gnu.org/software/gettext/manual/gettext.html#PO-Files for the syntax reference
// some details are taken from the GNU msgfmt behavior (like that indent is allows in front of lines)
// TODO:
// * add keywords for flags (fuzzy, c-format, ...)
// * highlight formats inside c-format strings (%s, %d, etc.)
// * style for previous untranslated string? ("#|" comment)
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#include <string>
#include <string_view>
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"
using namespace Lexilla;
static void ColourisePODoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *[], Accessor &styler) {
StyleContext sc(startPos, length, initStyle, styler);
bool escaped = false;
Sci_Position curLine = styler.GetLine(startPos);
// the line state holds the last state on or before the line that isn't the default style
int curLineState = curLine > 0 ? styler.GetLineState(curLine - 1) : SCE_PO_DEFAULT;
for (; sc.More(); sc.Forward()) {
// whether we should leave a state
switch (sc.state) {
case SCE_PO_COMMENT:
case SCE_PO_PROGRAMMER_COMMENT:
case SCE_PO_REFERENCE:
case SCE_PO_FLAGS:
case SCE_PO_FUZZY:
if (sc.atLineEnd)
sc.SetState(SCE_PO_DEFAULT);
else if (sc.state == SCE_PO_FLAGS && sc.Match("fuzzy"))
// here we behave like the previous parser, but this should probably be highlighted
// on its own like a keyword rather than changing the whole flags style
sc.ChangeState(SCE_PO_FUZZY);
break;
case SCE_PO_MSGCTXT:
case SCE_PO_MSGID:
case SCE_PO_MSGSTR:
if (isspacechar(sc.ch))
sc.SetState(SCE_PO_DEFAULT);
break;
case SCE_PO_ERROR:
if (sc.atLineEnd)
sc.SetState(SCE_PO_DEFAULT);
break;
case SCE_PO_MSGCTXT_TEXT:
case SCE_PO_MSGID_TEXT:
case SCE_PO_MSGSTR_TEXT:
if (sc.atLineEnd) { // invalid inside a string
if (sc.state == SCE_PO_MSGCTXT_TEXT)
sc.ChangeState(SCE_PO_MSGCTXT_TEXT_EOL);
else if (sc.state == SCE_PO_MSGID_TEXT)
sc.ChangeState(SCE_PO_MSGID_TEXT_EOL);
else if (sc.state == SCE_PO_MSGSTR_TEXT)
sc.ChangeState(SCE_PO_MSGSTR_TEXT_EOL);
sc.SetState(SCE_PO_DEFAULT);
escaped = false;
} else {
if (escaped)
escaped = false;
else if (sc.ch == '\\')
escaped = true;
else if (sc.ch == '"')
sc.ForwardSetState(SCE_PO_DEFAULT);
}
break;
}
// whether we should enter a new state
if (sc.state == SCE_PO_DEFAULT) {
// forward to the first non-white character on the line
bool atLineStart = sc.atLineStart;
if (atLineStart) {
// reset line state if it is set to comment state so empty lines don't get
// comment line state, and the folding code folds comments separately,
// and anyway the styling don't use line state for comments
if (curLineState == SCE_PO_COMMENT)
curLineState = SCE_PO_DEFAULT;
while (sc.More() && ! sc.atLineEnd && isspacechar(sc.ch))
sc.Forward();
}
if (atLineStart && sc.ch == '#') {
if (sc.chNext == '.')
sc.SetState(SCE_PO_PROGRAMMER_COMMENT);
else if (sc.chNext == ':')
sc.SetState(SCE_PO_REFERENCE);
else if (sc.chNext == ',')
sc.SetState(SCE_PO_FLAGS);
else
sc.SetState(SCE_PO_COMMENT);
} else if (atLineStart && sc.Match("msgid")) { // includes msgid_plural
sc.SetState(SCE_PO_MSGID);
} else if (atLineStart && sc.Match("msgstr")) { // includes [] suffixes
sc.SetState(SCE_PO_MSGSTR);
} else if (atLineStart && sc.Match("msgctxt")) {
sc.SetState(SCE_PO_MSGCTXT);
} else if (sc.ch == '"') {
if (curLineState == SCE_PO_MSGCTXT || curLineState == SCE_PO_MSGCTXT_TEXT)
sc.SetState(SCE_PO_MSGCTXT_TEXT);
else if (curLineState == SCE_PO_MSGID || curLineState == SCE_PO_MSGID_TEXT)
sc.SetState(SCE_PO_MSGID_TEXT);
else if (curLineState == SCE_PO_MSGSTR || curLineState == SCE_PO_MSGSTR_TEXT)
sc.SetState(SCE_PO_MSGSTR_TEXT);
else
sc.SetState(SCE_PO_ERROR);
} else if (! isspacechar(sc.ch))
sc.SetState(SCE_PO_ERROR);
if (sc.state != SCE_PO_DEFAULT)
curLineState = sc.state;
}
if (sc.atLineEnd) {
// Update the line state, so it can be seen by next line
curLine = styler.GetLine(sc.currentPos);
styler.SetLineState(curLine, curLineState);
}
}
sc.Complete();
}
static int FindNextNonEmptyLineState(Sci_PositionU startPos, Accessor &styler) {
Sci_PositionU length = styler.Length();
for (Sci_PositionU i = startPos; i < length; i++) {
if (! isspacechar(styler[i])) {
return styler.GetLineState(styler.GetLine(i));
}
}
return 0;
}
static void FoldPODoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[], Accessor &styler) {
if (! styler.GetPropertyInt("fold"))
return;
bool foldCompact = styler.GetPropertyInt("fold.compact") != 0;
bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
Sci_PositionU endPos = startPos + length;
Sci_Position curLine = styler.GetLine(startPos);
int lineState = styler.GetLineState(curLine);
int nextLineState;
int level = styler.LevelAt(curLine) & SC_FOLDLEVELNUMBERMASK;
int nextLevel;
int visible = 0;
int chNext = styler[startPos];
for (Sci_PositionU i = startPos; i < endPos; i++) {
int ch = chNext;
chNext = styler.SafeGetCharAt(i+1);
if (! isspacechar(ch)) {
visible++;
} else if ((ch == '\r' && chNext != '\n') || ch == '\n' || i+1 >= endPos) {
int lvl = level;
Sci_Position nextLine = curLine + 1;
nextLineState = styler.GetLineState(nextLine);
if ((lineState != SCE_PO_COMMENT || foldComment) &&
nextLineState == lineState &&
FindNextNonEmptyLineState(i, styler) == lineState)
nextLevel = SC_FOLDLEVELBASE + 1;
else
nextLevel = SC_FOLDLEVELBASE;
if (nextLevel > level)
lvl |= SC_FOLDLEVELHEADERFLAG;
if (visible == 0 && foldCompact)
lvl |= SC_FOLDLEVELWHITEFLAG;
styler.SetLevel(curLine, lvl);
lineState = nextLineState;
curLine = nextLine;
level = nextLevel;
visible = 0;
}
}
}
static const char *const poWordListDesc[] = {
0
};
LexerModule lmPO(SCLEX_PO, ColourisePODoc, "po", FoldPODoc, poWordListDesc);
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