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notepad-plus-plus/lexilla/lexers/LexCSS.cxx

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// Scintilla source code edit control
// Encoding: UTF-8
/** @file LexCSS.cxx
** Lexer for Cascading Style Sheets
** Written by Jakub Vrána
** Improved by Philippe Lhoste (CSS2)
** Improved by Ross McKay (SCSS mode; see http://sass-lang.com/ )
**/
// Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
// TODO: handle SCSS nested properties like font: { weight: bold; size: 1em; }
// TODO: handle SCSS interpolation: #{}
// TODO: add features for Less if somebody feels like contributing; http://lesscss.org/
// TODO: refactor this monster so that the next poor slob can read it!
#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 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;
}
// look behind (from start of document to our start position) to determine current nesting level
inline int NestingLevelLookBehind(Sci_PositionU startPos, Accessor &styler) {
int ch;
int nestingLevel = 0;
for (Sci_PositionU i = 0; i < startPos; i++) {
ch = styler.SafeGetCharAt(i);
if (ch == '{')
nestingLevel++;
else if (ch == '}')
nestingLevel--;
}
return nestingLevel;
}
static void ColouriseCssDoc(Sci_PositionU startPos, Sci_Position 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 lastStateVar = -1; // before variable (SCSS)
int lastStateVal = -1; // before value (SCSS)
int op = ' '; // last operator
int opPrev = ' '; // last operator
bool insideParentheses = false; // true if currently in a CSS url() or similar construct
// property lexer.css.scss.language
// Set to 1 for Sassy CSS (.scss)
bool isScssDocument = styler.GetPropertyInt("lexer.css.scss.language") != 0;
// property lexer.css.less.language
// Set to 1 for Less CSS (.less)
bool isLessDocument = styler.GetPropertyInt("lexer.css.less.language") != 0;
// property lexer.css.hss.language
// Set to 1 for HSS (.hss)
bool isHssDocument = styler.GetPropertyInt("lexer.css.hss.language") != 0;
// SCSS/LESS/HSS have the concept of variable
bool hasVariables = isScssDocument || isLessDocument || isHssDocument;
char varPrefix = 0;
if (hasVariables)
varPrefix = isLessDocument ? '@' : '$';
// SCSS/LESS/HSS support single-line comments
typedef enum _CommentModes { eCommentBlock = 0, eCommentLine = 1} CommentMode;
CommentMode comment_mode = eCommentBlock;
bool hasSingleLineComments = isScssDocument || isLessDocument || isHssDocument;
// must keep track of nesting level in document types that support it (SCSS/LESS/HSS)
bool hasNesting = false;
int nestingLevel = 0;
if (isScssDocument || isLessDocument || isHssDocument) {
hasNesting = true;
nestingLevel = NestingLevelLookBehind(startPos, styler);
}
// "the loop"
for (; sc.More(); sc.Forward()) {
if (sc.state == SCE_CSS_COMMENT && ((comment_mode == eCommentBlock && sc.Match('*', '/')) || (comment_mode == eCommentLine && sc.atLineEnd))) {
if (lastStateC == -1) {
// backtrack to get last state:
// comments are like whitespace, so we must return to the previous state
Sci_PositionU 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;
}
if (comment_mode == eCommentBlock) {
sc.Forward();
sc.ForwardSetState(lastStateC);
} else /* eCommentLine */ {
sc.SetState(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;
Sci_PositionU 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 == ' ') {
Sci_PositionU 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 || hasNesting)
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 '{':
nestingLevel++;
switch (lastState) {
case SCE_CSS_GROUP_RULE:
sc.SetState(SCE_CSS_DEFAULT);
break;
case SCE_CSS_TAG:
case SCE_CSS_DIRECTIVE:
sc.SetState(SCE_CSS_IDENTIFIER);
break;
}
break;
case '}':
if (--nestingLevel < 0)
nestingLevel = 0;
switch (lastState) {
case SCE_CSS_DEFAULT:
case SCE_CSS_VALUE:
case SCE_CSS_IMPORTANT:
case SCE_CSS_IDENTIFIER:
case SCE_CSS_IDENTIFIER2:
case SCE_CSS_IDENTIFIER3:
if (hasNesting)
sc.SetState(nestingLevel > 0 ? SCE_CSS_IDENTIFIER : SCE_CSS_DEFAULT);
else
sc.SetState(SCE_CSS_DEFAULT);
break;
}
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 ':':
switch (lastState) {
case SCE_CSS_TAG:
case SCE_CSS_DEFAULT:
case SCE_CSS_CLASS:
case SCE_CSS_ID:
case SCE_CSS_PSEUDOCLASS:
case SCE_CSS_EXTENDED_PSEUDOCLASS:
case SCE_CSS_UNKNOWN_PSEUDOCLASS:
case SCE_CSS_PSEUDOELEMENT:
case SCE_CSS_EXTENDED_PSEUDOELEMENT:
sc.SetState(SCE_CSS_PSEUDOCLASS);
break;
case SCE_CSS_IDENTIFIER:
case SCE_CSS_IDENTIFIER2:
case SCE_CSS_IDENTIFIER3:
case SCE_CSS_EXTENDED_IDENTIFIER:
case SCE_CSS_UNKNOWN_IDENTIFIER:
case SCE_CSS_VARIABLE:
sc.SetState(SCE_CSS_VALUE);
lastStateVal = lastState;
break;
}
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 ';':
switch (lastState) {
case SCE_CSS_DIRECTIVE:
if (hasNesting) {
sc.SetState(nestingLevel > 0 ? SCE_CSS_IDENTIFIER : SCE_CSS_DEFAULT);
} else {
sc.SetState(SCE_CSS_DEFAULT);
}
break;
case SCE_CSS_VALUE:
case SCE_CSS_IMPORTANT:
// data URLs can have semicolons; simplistically check for wrapping parentheses and move along
if (insideParentheses) {
sc.SetState(lastState);
} else {
if (lastStateVal == SCE_CSS_VARIABLE) {
sc.SetState(SCE_CSS_DEFAULT);
} else {
sc.SetState(SCE_CSS_IDENTIFIER);
}
}
break;
case SCE_CSS_VARIABLE:
if (lastStateVar == SCE_CSS_VALUE) {
// data URLs can have semicolons; simplistically check for wrapping parentheses and move along
if (insideParentheses) {
sc.SetState(SCE_CSS_VALUE);
} else {
sc.SetState(SCE_CSS_IDENTIFIER);
}
} else {
sc.SetState(SCE_CSS_DEFAULT);
}
break;
}
break;
case '!':
if (lastState == SCE_CSS_VALUE)
sc.SetState(SCE_CSS_IMPORTANT);
break;
}
}
if (sc.ch == '*' && sc.state == SCE_CSS_DEFAULT) {
sc.SetState(SCE_CSS_TAG);
continue;
}
// check for inside parentheses (whether part of an "operator" or not)
if (sc.ch == '(')
insideParentheses = true;
else if (sc.ch == ')')
insideParentheses = false;
// SCSS special modes
if (hasVariables) {
// variable name
if (sc.ch == varPrefix) {
switch (sc.state) {
case SCE_CSS_DEFAULT:
if (isLessDocument) // give priority to pseudo elements
break;
// Falls through.
case SCE_CSS_VALUE:
lastStateVar = sc.state;
sc.SetState(SCE_CSS_VARIABLE);
continue;
}
}
if (sc.state == SCE_CSS_VARIABLE) {
if (IsAWordChar(sc.ch)) {
// still looking at the variable name
continue;
}
if (lastStateVar == SCE_CSS_VALUE) {
// not looking at the variable name any more, and it was part of a value
sc.SetState(SCE_CSS_VALUE);
}
}
// nested rule parent selector
if (sc.ch == '&') {
switch (sc.state) {
case SCE_CSS_DEFAULT:
case SCE_CSS_IDENTIFIER:
sc.SetState(SCE_CSS_TAG);
continue;
}
}
}
// nesting rules that apply to SCSS and Less
if (hasNesting) {
// check for nested rule selector
if (sc.state == SCE_CSS_IDENTIFIER && (IsAWordChar(sc.ch) || sc.ch == ':' || sc.ch == '.' || sc.ch == '#')) {
// look ahead to see whether { comes before next ; and }
Sci_PositionU endPos = startPos + length;
int ch;
for (Sci_PositionU i = sc.currentPos; i < endPos; i++) {
ch = styler.SafeGetCharAt(i);
if (ch == ';' || ch == '}')
break;
if (ch == '{') {
sc.SetState(SCE_CSS_DEFAULT);
continue;
}
}
}
}
if (IsAWordChar(sc.ch)) {
if (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 || strcmp(s2, "supports") == 0 || strcmp(s2, "document") == 0 || strcmp(s2, "-moz-document") == 0))
sc.ChangeState(SCE_CSS_GROUP_RULE);
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;
comment_mode = eCommentBlock;
sc.SetState(SCE_CSS_COMMENT);
sc.Forward();
} else if (hasSingleLineComments && sc.Match('/', '/') && !insideParentheses) {
// note that we've had to treat ([...]// as the start of a URL not a comment, e.g. url(http://example.com), url(//example.com)
lastStateC = sc.state;
comment_mode = eCommentLine;
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_GROUP_RULE) || 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(Sci_PositionU startPos, Sci_Position length, int, 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];
bool inComment = (styler.StyleAt(startPos-1) == SCE_CSS_COMMENT);
for (Sci_PositionU 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
};
extern const LexerModule lmCss(SCLEX_CSS, ColouriseCssDoc, "css", FoldCSSDoc, cssWordListDesc);