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// Copyright (c) 1990-2007, Scientific Toolworks, Inc.
// @file LexPLM.cxx
// Author: Jason Haslam
// The License.txt file describes the conditions under which this software may be distributed.
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#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 Scintilla;
static void GetRange(Sci_PositionU start,
Sci_PositionU end,
Accessor &styler,
char *s,
Sci_PositionU len) {
Sci_PositionU i = 0;
while ((i < end - start + 1) && (i < len-1)) {
s[i] = static_cast<char>(tolower(styler[start + i]));
i++;
}
s[i] = '\0';
}
static void ColourisePlmDoc(Sci_PositionU startPos,
Sci_Position length,
int initStyle,
WordList *keywordlists[],
Accessor &styler)
{
Sci_PositionU endPos = startPos + length;
int state = initStyle;
styler.StartAt(startPos);
styler.StartSegment(startPos);
for (Sci_PositionU i = startPos; i < endPos; i++) {
char ch = styler.SafeGetCharAt(i);
char chNext = styler.SafeGetCharAt(i + 1);
if (state == SCE_PLM_DEFAULT) {
if (ch == '/' && chNext == '*') {
styler.ColourTo(i - 1, state);
state = SCE_PLM_COMMENT;
} else if (ch == '\'') {
styler.ColourTo(i - 1, state);
state = SCE_PLM_STRING;
} else if (isdigit(ch)) {
styler.ColourTo(i - 1, state);
state = SCE_PLM_NUMBER;
} else if (isalpha(ch)) {
styler.ColourTo(i - 1, state);
state = SCE_PLM_IDENTIFIER;
} else if (ch == '+' || ch == '-' || ch == '*' || ch == '/' ||
ch == '=' || ch == '<' || ch == '>' || ch == ':') {
styler.ColourTo(i - 1, state);
state = SCE_PLM_OPERATOR;
} else if (ch == '$') {
styler.ColourTo(i - 1, state);
state = SCE_PLM_CONTROL;
}
} else if (state == SCE_PLM_COMMENT) {
if (ch == '*' && chNext == '/') {
i++;
styler.ColourTo(i, state);
state = SCE_PLM_DEFAULT;
}
} else if (state == SCE_PLM_STRING) {
if (ch == '\'') {
if (chNext == '\'') {
i++;
} else {
styler.ColourTo(i, state);
state = SCE_PLM_DEFAULT;
}
}
} else if (state == SCE_PLM_NUMBER) {
if (!isdigit(ch) && !isalpha(ch) && ch != '$') {
i--;
styler.ColourTo(i, state);
state = SCE_PLM_DEFAULT;
}
} else if (state == SCE_PLM_IDENTIFIER) {
if (!isdigit(ch) && !isalpha(ch) && ch != '$') {
// Get the entire identifier.
char word[1024];
Sci_Position segmentStart = styler.GetStartSegment();
GetRange(segmentStart, i - 1, styler, word, sizeof(word));
i--;
if (keywordlists[0]->InList(word))
styler.ColourTo(i, SCE_PLM_KEYWORD);
else
styler.ColourTo(i, state);
state = SCE_PLM_DEFAULT;
}
} else if (state == SCE_PLM_OPERATOR) {
if (ch != '=' && ch != '>') {
i--;
styler.ColourTo(i, state);
state = SCE_PLM_DEFAULT;
}
} else if (state == SCE_PLM_CONTROL) {
if (ch == '\r' || ch == '\n') {
styler.ColourTo(i - 1, state);
state = SCE_PLM_DEFAULT;
}
}
}
styler.ColourTo(endPos - 1, state);
}
static void FoldPlmDoc(Sci_PositionU startPos,
Sci_Position length,
int initStyle,
WordList *[],
Accessor &styler)
{
bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
Sci_PositionU endPos = startPos + length;
int visibleChars = 0;
Sci_Position lineCurrent = styler.GetLine(startPos);
int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
int levelCurrent = levelPrev;
char chNext = styler[startPos];
int styleNext = styler.StyleAt(startPos);
int style = initStyle;
Sci_Position startKeyword = 0;
for (Sci_PositionU i = startPos; i < endPos; i++) {
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
int stylePrev = style;
style = styleNext;
styleNext = styler.StyleAt(i + 1);
bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
if (stylePrev != SCE_PLM_KEYWORD && style == SCE_PLM_KEYWORD)
startKeyword = i;
if (style == SCE_PLM_KEYWORD && styleNext != SCE_PLM_KEYWORD) {
char word[1024];
GetRange(startKeyword, i, styler, word, sizeof(word));
if (strcmp(word, "procedure") == 0 || strcmp(word, "do") == 0)
levelCurrent++;
else if (strcmp(word, "end") == 0)
levelCurrent--;
}
if (foldComment) {
if (stylePrev != SCE_PLM_COMMENT && style == SCE_PLM_COMMENT)
levelCurrent++;
else if (stylePrev == SCE_PLM_COMMENT && style != SCE_PLM_COMMENT)
levelCurrent--;
}
if (atEOL) {
int lev = levelPrev;
if (visibleChars == 0 && foldCompact)
lev |= SC_FOLDLEVELWHITEFLAG;
if ((levelCurrent > levelPrev) && (visibleChars > 0))
lev |= SC_FOLDLEVELHEADERFLAG;
if (lev != styler.LevelAt(lineCurrent)) {
styler.SetLevel(lineCurrent, lev);
}
lineCurrent++;
levelPrev = levelCurrent;
visibleChars = 0;
}
if (!isspacechar(ch))
visibleChars++;
}
int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
styler.SetLevel(lineCurrent, levelPrev | flagsNext);
}
static const char *const plmWordListDesc[] = {
"Keywords",
0
};
LexerModule lmPLM(SCLEX_PLM, ColourisePlmDoc, "PL/M", FoldPlmDoc, plmWordListDesc);
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