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notepad-plus-plus/scintilla/lexers/LexCSS.cxx
Don Ho 0152ded3ff [UPDATE] Scintilla update from 2.21 to 2.25 
git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@742 f5eea248-9336-0410-98b8-ebc06183d4e3
2011-03-22 00:16:49 +00:00

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// Scintilla source code edit control
/** @file LexCSS.cxx
** Lexer for Cascading Style Sheets
** Written by Jakub Vrána
** Improved by Philippe Lhoste (CSS2)
**/
// Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
// 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"
#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif
static inline bool IsAWordChar(const unsigned int ch) {
/* FIXME:
* The CSS spec allows "ISO 10646 characters U+00A1 and higher" to be treated as word chars.
* Unfortunately, we are only getting string bytes here, and not full unicode characters. We cannot guarantee
* that our byte is between U+0080 - U+00A0 (to return false), so we have to allow all characters U+0080 and higher
*/
return ch >= 0x80 || isalnum(ch) || ch == '-' || ch == '_';
}
inline bool IsCssOperator(const int ch) {
if (!((ch < 0x80) && isalnum(ch)) &&
(ch == '{' || ch == '}' || ch == ':' || ch == ',' || ch == ';' ||
ch == '.' || ch == '#' || ch == '!' || ch == '@' ||
/* CSS2 */
ch == '*' || ch == '>' || ch == '+' || ch == '=' || ch == '~' || ch == '|' ||
ch == '[' || ch == ']' || ch == '(' || ch == ')')) {
return true;
}
return false;
}
static void ColouriseCssDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[], Accessor &styler) {
WordList &css1Props = *keywordlists[0];
WordList &pseudoClasses = *keywordlists[1];
WordList &css2Props = *keywordlists[2];
WordList &css3Props = *keywordlists[3];
WordList &pseudoElements = *keywordlists[4];
WordList &exProps = *keywordlists[5];
WordList &exPseudoClasses = *keywordlists[6];
WordList &exPseudoElements = *keywordlists[7];
StyleContext sc(startPos, length, initStyle, styler);
int lastState = -1; // before operator
int lastStateC = -1; // before comment
int lastStateS = -1; // before single-quoted/double-quoted string
int op = ' '; // last operator
int opPrev = ' '; // last operator
for (; sc.More(); sc.Forward()) {
if (sc.state == SCE_CSS_COMMENT && sc.Match('*', '/')) {
if (lastStateC == -1) {
// backtrack to get last state:
// comments are like whitespace, so we must return to the previous state
unsigned int i = startPos;
for (; i > 0; i--) {
if ((lastStateC = styler.StyleAt(i-1)) != SCE_CSS_COMMENT) {
if (lastStateC == SCE_CSS_OPERATOR) {
op = styler.SafeGetCharAt(i-1);
opPrev = styler.SafeGetCharAt(i-2);
while (--i) {
lastState = styler.StyleAt(i-1);
if (lastState != SCE_CSS_OPERATOR && lastState != SCE_CSS_COMMENT)
break;
}
if (i == 0)
lastState = SCE_CSS_DEFAULT;
}
break;
}
}
if (i == 0)
lastStateC = SCE_CSS_DEFAULT;
}
sc.Forward();
sc.ForwardSetState(lastStateC);
}
if (sc.state == SCE_CSS_COMMENT)
continue;
if (sc.state == SCE_CSS_DOUBLESTRING || sc.state == SCE_CSS_SINGLESTRING) {
if (sc.ch != (sc.state == SCE_CSS_DOUBLESTRING ? '\"' : '\''))
continue;
unsigned int i = sc.currentPos;
while (i && styler[i-1] == '\\')
i--;
if ((sc.currentPos - i) % 2 == 1)
continue;
sc.ForwardSetState(lastStateS);
}
if (sc.state == SCE_CSS_OPERATOR) {
if (op == ' ') {
unsigned int i = startPos;
op = styler.SafeGetCharAt(i-1);
opPrev = styler.SafeGetCharAt(i-2);
while (--i) {
lastState = styler.StyleAt(i-1);
if (lastState != SCE_CSS_OPERATOR && lastState != SCE_CSS_COMMENT)
break;
}
}
switch (op) {
case '@':
if (lastState == SCE_CSS_DEFAULT)
sc.SetState(SCE_CSS_DIRECTIVE);
break;
case '>':
case '+':
if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
sc.SetState(SCE_CSS_DEFAULT);
break;
case '[':
if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
sc.SetState(SCE_CSS_ATTRIBUTE);
break;
case ']':
if (lastState == SCE_CSS_ATTRIBUTE)
sc.SetState(SCE_CSS_TAG);
break;
case '{':
if (lastState == SCE_CSS_MEDIA)
sc.SetState(SCE_CSS_DEFAULT);
else if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DIRECTIVE)
sc.SetState(SCE_CSS_IDENTIFIER);
break;
case '}':
if (lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_VALUE || lastState == SCE_CSS_IMPORTANT ||
lastState == SCE_CSS_IDENTIFIER || lastState == SCE_CSS_IDENTIFIER2 || lastState == SCE_CSS_IDENTIFIER3)
sc.SetState(SCE_CSS_DEFAULT);
break;
case '(':
if (lastState == SCE_CSS_PSEUDOCLASS)
sc.SetState(SCE_CSS_TAG);
else if (lastState == SCE_CSS_EXTENDED_PSEUDOCLASS)
sc.SetState(SCE_CSS_EXTENDED_PSEUDOCLASS);
break;
case ')':
if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS ||
lastState == SCE_CSS_PSEUDOELEMENT || lastState == SCE_CSS_EXTENDED_PSEUDOELEMENT)
sc.SetState(SCE_CSS_TAG);
break;
case ':':
if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS ||
lastState == SCE_CSS_PSEUDOELEMENT || lastState == SCE_CSS_EXTENDED_PSEUDOELEMENT)
sc.SetState(SCE_CSS_PSEUDOCLASS);
else if (lastState == SCE_CSS_IDENTIFIER || lastState == SCE_CSS_IDENTIFIER2 ||
lastState == SCE_CSS_IDENTIFIER3 || lastState == SCE_CSS_EXTENDED_IDENTIFIER ||
lastState == SCE_CSS_UNKNOWN_IDENTIFIER)
sc.SetState(SCE_CSS_VALUE);
break;
case '.':
if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
sc.SetState(SCE_CSS_CLASS);
break;
case '#':
if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
sc.SetState(SCE_CSS_ID);
break;
case ',':
case '|':
case '~':
if (lastState == SCE_CSS_TAG)
sc.SetState(SCE_CSS_DEFAULT);
break;
case ';':
if (lastState == SCE_CSS_DIRECTIVE)
sc.SetState(SCE_CSS_DEFAULT);
else if (lastState == SCE_CSS_VALUE || lastState == SCE_CSS_IMPORTANT)
sc.SetState(SCE_CSS_IDENTIFIER);
break;
case '!':
if (lastState == SCE_CSS_VALUE)
sc.SetState(SCE_CSS_IMPORTANT);
break;
}
}
if (IsAWordChar(sc.ch)) {
if (sc.state == SCE_CSS_DEFAULT)
sc.SetState(SCE_CSS_TAG);
continue;
}
if (sc.ch == '*' && sc.state == SCE_CSS_DEFAULT) {
sc.SetState(SCE_CSS_TAG);
continue;
}
if (IsAWordChar(sc.chPrev) && (
sc.state == SCE_CSS_IDENTIFIER || sc.state == SCE_CSS_IDENTIFIER2 ||
sc.state == SCE_CSS_IDENTIFIER3 || sc.state == SCE_CSS_EXTENDED_IDENTIFIER ||
sc.state == SCE_CSS_UNKNOWN_IDENTIFIER ||
sc.state == SCE_CSS_PSEUDOCLASS || sc.state == SCE_CSS_PSEUDOELEMENT ||
sc.state == SCE_CSS_EXTENDED_PSEUDOCLASS || sc.state == SCE_CSS_EXTENDED_PSEUDOELEMENT ||
sc.state == SCE_CSS_UNKNOWN_PSEUDOCLASS ||
sc.state == SCE_CSS_IMPORTANT ||
sc.state == SCE_CSS_DIRECTIVE
)) {
char s[100];
sc.GetCurrentLowered(s, sizeof(s));
char *s2 = s;
while (*s2 && !IsAWordChar(*s2))
s2++;
switch (sc.state) {
case SCE_CSS_IDENTIFIER:
case SCE_CSS_IDENTIFIER2:
case SCE_CSS_IDENTIFIER3:
case SCE_CSS_EXTENDED_IDENTIFIER:
case SCE_CSS_UNKNOWN_IDENTIFIER:
if (css1Props.InList(s2))
sc.ChangeState(SCE_CSS_IDENTIFIER);
else if (css2Props.InList(s2))
sc.ChangeState(SCE_CSS_IDENTIFIER2);
else if (css3Props.InList(s2))
sc.ChangeState(SCE_CSS_IDENTIFIER3);
else if (exProps.InList(s2))
sc.ChangeState(SCE_CSS_EXTENDED_IDENTIFIER);
else
sc.ChangeState(SCE_CSS_UNKNOWN_IDENTIFIER);
break;
case SCE_CSS_PSEUDOCLASS:
case SCE_CSS_PSEUDOELEMENT:
case SCE_CSS_EXTENDED_PSEUDOCLASS:
case SCE_CSS_EXTENDED_PSEUDOELEMENT:
case SCE_CSS_UNKNOWN_PSEUDOCLASS:
if (op == ':' && opPrev != ':' && pseudoClasses.InList(s2))
sc.ChangeState(SCE_CSS_PSEUDOCLASS);
else if (opPrev == ':' && pseudoElements.InList(s2))
sc.ChangeState(SCE_CSS_PSEUDOELEMENT);
else if ((op == ':' || (op == '(' && lastState == SCE_CSS_EXTENDED_PSEUDOCLASS)) && opPrev != ':' && exPseudoClasses.InList(s2))
sc.ChangeState(SCE_CSS_EXTENDED_PSEUDOCLASS);
else if (opPrev == ':' && exPseudoElements.InList(s2))
sc.ChangeState(SCE_CSS_EXTENDED_PSEUDOELEMENT);
else
sc.ChangeState(SCE_CSS_UNKNOWN_PSEUDOCLASS);
break;
case SCE_CSS_IMPORTANT:
if (strcmp(s2, "important") != 0)
sc.ChangeState(SCE_CSS_VALUE);
break;
case SCE_CSS_DIRECTIVE:
if (op == '@' && strcmp(s2, "media") == 0)
sc.ChangeState(SCE_CSS_MEDIA);
break;
}
}
if (sc.ch != '.' && sc.ch != ':' && sc.ch != '#' && (
sc.state == SCE_CSS_CLASS || sc.state == SCE_CSS_ID ||
(sc.ch != '(' && sc.ch != ')' && ( /* This line of the condition makes it possible to extend pseudo-classes with parentheses */
sc.state == SCE_CSS_PSEUDOCLASS || sc.state == SCE_CSS_PSEUDOELEMENT ||
sc.state == SCE_CSS_EXTENDED_PSEUDOCLASS || sc.state == SCE_CSS_EXTENDED_PSEUDOELEMENT ||
sc.state == SCE_CSS_UNKNOWN_PSEUDOCLASS
))
))
sc.SetState(SCE_CSS_TAG);
if (sc.Match('/', '*')) {
lastStateC = sc.state;
sc.SetState(SCE_CSS_COMMENT);
sc.Forward();
} else if ((sc.state == SCE_CSS_VALUE || sc.state == SCE_CSS_ATTRIBUTE)
&& (sc.ch == '\"' || sc.ch == '\'')) {
lastStateS = sc.state;
sc.SetState((sc.ch == '\"' ? SCE_CSS_DOUBLESTRING : SCE_CSS_SINGLESTRING));
} else if (IsCssOperator(sc.ch)
&& (sc.state != SCE_CSS_ATTRIBUTE || sc.ch == ']')
&& (sc.state != SCE_CSS_VALUE || sc.ch == ';' || sc.ch == '}' || sc.ch == '!')
&& ((sc.state != SCE_CSS_DIRECTIVE && sc.state != SCE_CSS_MEDIA) || sc.ch == ';' || sc.ch == '{')
) {
if (sc.state != SCE_CSS_OPERATOR)
lastState = sc.state;
sc.SetState(SCE_CSS_OPERATOR);
op = sc.ch;
opPrev = sc.chPrev;
}
}
sc.Complete();
}
static void FoldCSSDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
unsigned int endPos = startPos + length;
int visibleChars = 0;
int lineCurrent = styler.GetLine(startPos);
int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
int levelCurrent = levelPrev;
char chNext = styler[startPos];
bool inComment = (styler.StyleAt(startPos-1) == SCE_CSS_COMMENT);
for (unsigned int i = startPos; i < endPos; i++) {
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
int style = styler.StyleAt(i);
bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
if (foldComment) {
if (!inComment && (style == SCE_CSS_COMMENT))
levelCurrent++;
else if (inComment && (style != SCE_CSS_COMMENT))
levelCurrent--;
inComment = (style == SCE_CSS_COMMENT);
}
if (style == SCE_CSS_OPERATOR) {
if (ch == '{') {
levelCurrent++;
} else if (ch == '}') {
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++;
}
// Fill in the real level of the next line, keeping the current flags as they will be filled in later
int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
styler.SetLevel(lineCurrent, levelPrev | flagsNext);
}
static const char * const cssWordListDesc[] = {
"CSS1 Properties",
"Pseudo-classes",
"CSS2 Properties",
"CSS3 Properties",
"Pseudo-elements",
"Browser-Specific CSS Properties",
"Browser-Specific Pseudo-classes",
"Browser-Specific Pseudo-elements",
0
};
LexerModule lmCss(SCLEX_CSS, ColouriseCssDoc, "css", FoldCSSDoc, cssWordListDesc);
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