571 lines
18 KiB
C++
571 lines
18 KiB
C++
// Scintilla source code edit control
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// Encoding: UTF-8
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/** @file LexCSS.cxx
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** Lexer for Cascading Style Sheets
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** Written by Jakub Vrána
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** Improved by Philippe Lhoste (CSS2)
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** Improved by Ross McKay (SCSS mode; see http://sass-lang.com/ )
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**/
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// Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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// TODO: handle SCSS nested properties like font: { weight: bold; size: 1em; }
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// TODO: handle SCSS interpolation: #{}
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// TODO: add features for Less if somebody feels like contributing; http://lesscss.org/
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// TODO: refactor this monster so that the next poor slob can read it!
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include <string>
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#include <string_view>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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using namespace Lexilla;
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static inline bool IsAWordChar(const unsigned int ch) {
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/* FIXME:
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* The CSS spec allows "ISO 10646 characters U+00A1 and higher" to be treated as word chars.
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* Unfortunately, we are only getting string bytes here, and not full unicode characters. We cannot guarantee
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* that our byte is between U+0080 - U+00A0 (to return false), so we have to allow all characters U+0080 and higher
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*/
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return ch >= 0x80 || isalnum(ch) || ch == '-' || ch == '_';
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}
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inline bool IsCssOperator(const int ch) {
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if (!((ch < 0x80) && isalnum(ch)) &&
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(ch == '{' || ch == '}' || ch == ':' || ch == ',' || ch == ';' ||
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ch == '.' || ch == '#' || ch == '!' || ch == '@' ||
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/* CSS2 */
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ch == '*' || ch == '>' || ch == '+' || ch == '=' || ch == '~' || ch == '|' ||
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ch == '[' || ch == ']' || ch == '(' || ch == ')')) {
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return true;
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}
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return false;
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}
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// look behind (from start of document to our start position) to determine current nesting level
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inline int NestingLevelLookBehind(Sci_PositionU startPos, Accessor &styler) {
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int ch;
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int nestingLevel = 0;
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for (Sci_PositionU i = 0; i < startPos; i++) {
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ch = styler.SafeGetCharAt(i);
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if (ch == '{')
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nestingLevel++;
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else if (ch == '}')
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nestingLevel--;
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}
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return nestingLevel;
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}
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static void ColouriseCssDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[], Accessor &styler) {
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WordList &css1Props = *keywordlists[0];
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WordList &pseudoClasses = *keywordlists[1];
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WordList &css2Props = *keywordlists[2];
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WordList &css3Props = *keywordlists[3];
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WordList &pseudoElements = *keywordlists[4];
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WordList &exProps = *keywordlists[5];
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WordList &exPseudoClasses = *keywordlists[6];
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WordList &exPseudoElements = *keywordlists[7];
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StyleContext sc(startPos, length, initStyle, styler);
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int lastState = -1; // before operator
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int lastStateC = -1; // before comment
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int lastStateS = -1; // before single-quoted/double-quoted string
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int lastStateVar = -1; // before variable (SCSS)
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int lastStateVal = -1; // before value (SCSS)
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int op = ' '; // last operator
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int opPrev = ' '; // last operator
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bool insideParentheses = false; // true if currently in a CSS url() or similar construct
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// property lexer.css.scss.language
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// Set to 1 for Sassy CSS (.scss)
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bool isScssDocument = styler.GetPropertyInt("lexer.css.scss.language") != 0;
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// property lexer.css.less.language
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// Set to 1 for Less CSS (.less)
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bool isLessDocument = styler.GetPropertyInt("lexer.css.less.language") != 0;
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// property lexer.css.hss.language
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// Set to 1 for HSS (.hss)
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bool isHssDocument = styler.GetPropertyInt("lexer.css.hss.language") != 0;
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// SCSS/LESS/HSS have the concept of variable
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bool hasVariables = isScssDocument || isLessDocument || isHssDocument;
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char varPrefix = 0;
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if (hasVariables)
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varPrefix = isLessDocument ? '@' : '$';
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// SCSS/LESS/HSS support single-line comments
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typedef enum _CommentModes { eCommentBlock = 0, eCommentLine = 1} CommentMode;
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CommentMode comment_mode = eCommentBlock;
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bool hasSingleLineComments = isScssDocument || isLessDocument || isHssDocument;
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// must keep track of nesting level in document types that support it (SCSS/LESS/HSS)
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bool hasNesting = false;
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int nestingLevel = 0;
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if (isScssDocument || isLessDocument || isHssDocument) {
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hasNesting = true;
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nestingLevel = NestingLevelLookBehind(startPos, styler);
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}
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// "the loop"
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for (; sc.More(); sc.Forward()) {
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if (sc.state == SCE_CSS_COMMENT && ((comment_mode == eCommentBlock && sc.Match('*', '/')) || (comment_mode == eCommentLine && sc.atLineEnd))) {
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if (lastStateC == -1) {
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// backtrack to get last state:
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// comments are like whitespace, so we must return to the previous state
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Sci_PositionU i = startPos;
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for (; i > 0; i--) {
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if ((lastStateC = styler.StyleAt(i-1)) != SCE_CSS_COMMENT) {
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if (lastStateC == SCE_CSS_OPERATOR) {
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op = styler.SafeGetCharAt(i-1);
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opPrev = styler.SafeGetCharAt(i-2);
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while (--i) {
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lastState = styler.StyleAt(i-1);
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if (lastState != SCE_CSS_OPERATOR && lastState != SCE_CSS_COMMENT)
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break;
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}
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if (i == 0)
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lastState = SCE_CSS_DEFAULT;
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}
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break;
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}
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}
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if (i == 0)
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lastStateC = SCE_CSS_DEFAULT;
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}
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if (comment_mode == eCommentBlock) {
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sc.Forward();
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sc.ForwardSetState(lastStateC);
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} else /* eCommentLine */ {
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sc.SetState(lastStateC);
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}
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}
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if (sc.state == SCE_CSS_COMMENT)
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continue;
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if (sc.state == SCE_CSS_DOUBLESTRING || sc.state == SCE_CSS_SINGLESTRING) {
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if (sc.ch != (sc.state == SCE_CSS_DOUBLESTRING ? '\"' : '\''))
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continue;
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Sci_PositionU i = sc.currentPos;
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while (i && styler[i-1] == '\\')
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i--;
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if ((sc.currentPos - i) % 2 == 1)
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continue;
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sc.ForwardSetState(lastStateS);
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}
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if (sc.state == SCE_CSS_OPERATOR) {
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if (op == ' ') {
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Sci_PositionU i = startPos;
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op = styler.SafeGetCharAt(i-1);
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opPrev = styler.SafeGetCharAt(i-2);
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while (--i) {
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lastState = styler.StyleAt(i-1);
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if (lastState != SCE_CSS_OPERATOR && lastState != SCE_CSS_COMMENT)
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break;
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}
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}
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switch (op) {
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case '@':
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if (lastState == SCE_CSS_DEFAULT || hasNesting)
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sc.SetState(SCE_CSS_DIRECTIVE);
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break;
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case '>':
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case '+':
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if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
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lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
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sc.SetState(SCE_CSS_DEFAULT);
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break;
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case '[':
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if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
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lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
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sc.SetState(SCE_CSS_ATTRIBUTE);
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break;
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case ']':
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if (lastState == SCE_CSS_ATTRIBUTE)
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sc.SetState(SCE_CSS_TAG);
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break;
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case '{':
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nestingLevel++;
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switch (lastState) {
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case SCE_CSS_GROUP_RULE:
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sc.SetState(SCE_CSS_DEFAULT);
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break;
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case SCE_CSS_TAG:
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case SCE_CSS_DIRECTIVE:
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sc.SetState(SCE_CSS_IDENTIFIER);
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break;
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}
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break;
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case '}':
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if (--nestingLevel < 0)
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nestingLevel = 0;
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switch (lastState) {
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case SCE_CSS_DEFAULT:
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case SCE_CSS_VALUE:
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case SCE_CSS_IMPORTANT:
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case SCE_CSS_IDENTIFIER:
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case SCE_CSS_IDENTIFIER2:
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case SCE_CSS_IDENTIFIER3:
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if (hasNesting)
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sc.SetState(nestingLevel > 0 ? SCE_CSS_IDENTIFIER : SCE_CSS_DEFAULT);
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else
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sc.SetState(SCE_CSS_DEFAULT);
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break;
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}
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break;
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case '(':
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if (lastState == SCE_CSS_PSEUDOCLASS)
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sc.SetState(SCE_CSS_TAG);
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else if (lastState == SCE_CSS_EXTENDED_PSEUDOCLASS)
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sc.SetState(SCE_CSS_EXTENDED_PSEUDOCLASS);
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break;
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case ')':
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if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
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lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS ||
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lastState == SCE_CSS_PSEUDOELEMENT || lastState == SCE_CSS_EXTENDED_PSEUDOELEMENT)
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sc.SetState(SCE_CSS_TAG);
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break;
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case ':':
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switch (lastState) {
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case SCE_CSS_TAG:
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case SCE_CSS_DEFAULT:
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case SCE_CSS_CLASS:
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case SCE_CSS_ID:
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case SCE_CSS_PSEUDOCLASS:
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case SCE_CSS_EXTENDED_PSEUDOCLASS:
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case SCE_CSS_UNKNOWN_PSEUDOCLASS:
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case SCE_CSS_PSEUDOELEMENT:
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case SCE_CSS_EXTENDED_PSEUDOELEMENT:
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sc.SetState(SCE_CSS_PSEUDOCLASS);
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break;
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case SCE_CSS_IDENTIFIER:
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case SCE_CSS_IDENTIFIER2:
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case SCE_CSS_IDENTIFIER3:
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case SCE_CSS_EXTENDED_IDENTIFIER:
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case SCE_CSS_UNKNOWN_IDENTIFIER:
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case SCE_CSS_VARIABLE:
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sc.SetState(SCE_CSS_VALUE);
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lastStateVal = lastState;
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break;
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}
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break;
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case '.':
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if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
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lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
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sc.SetState(SCE_CSS_CLASS);
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break;
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case '#':
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if (lastState == SCE_CSS_TAG || lastState == SCE_CSS_DEFAULT || lastState == SCE_CSS_CLASS || lastState == SCE_CSS_ID ||
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lastState == SCE_CSS_PSEUDOCLASS || lastState == SCE_CSS_EXTENDED_PSEUDOCLASS || lastState == SCE_CSS_UNKNOWN_PSEUDOCLASS)
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sc.SetState(SCE_CSS_ID);
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break;
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case ',':
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case '|':
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case '~':
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if (lastState == SCE_CSS_TAG)
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sc.SetState(SCE_CSS_DEFAULT);
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break;
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case ';':
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switch (lastState) {
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case SCE_CSS_DIRECTIVE:
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if (hasNesting) {
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sc.SetState(nestingLevel > 0 ? SCE_CSS_IDENTIFIER : SCE_CSS_DEFAULT);
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} else {
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sc.SetState(SCE_CSS_DEFAULT);
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}
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break;
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case SCE_CSS_VALUE:
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case SCE_CSS_IMPORTANT:
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// data URLs can have semicolons; simplistically check for wrapping parentheses and move along
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if (insideParentheses) {
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sc.SetState(lastState);
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} else {
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if (lastStateVal == SCE_CSS_VARIABLE) {
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sc.SetState(SCE_CSS_DEFAULT);
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} else {
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sc.SetState(SCE_CSS_IDENTIFIER);
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}
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}
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break;
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case SCE_CSS_VARIABLE:
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if (lastStateVar == SCE_CSS_VALUE) {
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// data URLs can have semicolons; simplistically check for wrapping parentheses and move along
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if (insideParentheses) {
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sc.SetState(SCE_CSS_VALUE);
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} else {
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sc.SetState(SCE_CSS_IDENTIFIER);
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}
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} else {
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sc.SetState(SCE_CSS_DEFAULT);
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}
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break;
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}
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break;
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case '!':
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if (lastState == SCE_CSS_VALUE)
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sc.SetState(SCE_CSS_IMPORTANT);
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break;
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}
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}
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if (sc.ch == '*' && sc.state == SCE_CSS_DEFAULT) {
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sc.SetState(SCE_CSS_TAG);
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continue;
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}
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// check for inside parentheses (whether part of an "operator" or not)
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if (sc.ch == '(')
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insideParentheses = true;
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else if (sc.ch == ')')
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insideParentheses = false;
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// SCSS special modes
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if (hasVariables) {
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// variable name
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if (sc.ch == varPrefix) {
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switch (sc.state) {
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case SCE_CSS_DEFAULT:
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if (isLessDocument) // give priority to pseudo elements
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break;
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// Falls through.
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case SCE_CSS_VALUE:
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lastStateVar = sc.state;
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sc.SetState(SCE_CSS_VARIABLE);
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continue;
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}
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}
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if (sc.state == SCE_CSS_VARIABLE) {
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if (IsAWordChar(sc.ch)) {
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// still looking at the variable name
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continue;
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}
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if (lastStateVar == SCE_CSS_VALUE) {
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// not looking at the variable name any more, and it was part of a value
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sc.SetState(SCE_CSS_VALUE);
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}
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}
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// nested rule parent selector
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if (sc.ch == '&') {
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switch (sc.state) {
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case SCE_CSS_DEFAULT:
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case SCE_CSS_IDENTIFIER:
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sc.SetState(SCE_CSS_TAG);
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continue;
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}
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}
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}
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// nesting rules that apply to SCSS and Less
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if (hasNesting) {
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// check for nested rule selector
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if (sc.state == SCE_CSS_IDENTIFIER && (IsAWordChar(sc.ch) || sc.ch == ':' || sc.ch == '.' || sc.ch == '#')) {
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// look ahead to see whether { comes before next ; and }
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Sci_PositionU endPos = startPos + length;
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int ch;
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for (Sci_PositionU i = sc.currentPos; i < endPos; i++) {
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ch = styler.SafeGetCharAt(i);
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if (ch == ';' || ch == '}')
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break;
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if (ch == '{') {
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sc.SetState(SCE_CSS_DEFAULT);
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continue;
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}
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}
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}
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}
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if (IsAWordChar(sc.ch)) {
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if (sc.state == SCE_CSS_DEFAULT)
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sc.SetState(SCE_CSS_TAG);
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continue;
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}
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if (IsAWordChar(sc.chPrev) && (
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sc.state == SCE_CSS_IDENTIFIER || sc.state == SCE_CSS_IDENTIFIER2 ||
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sc.state == SCE_CSS_IDENTIFIER3 || sc.state == SCE_CSS_EXTENDED_IDENTIFIER ||
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sc.state == SCE_CSS_UNKNOWN_IDENTIFIER ||
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sc.state == SCE_CSS_PSEUDOCLASS || sc.state == SCE_CSS_PSEUDOELEMENT ||
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sc.state == SCE_CSS_EXTENDED_PSEUDOCLASS || sc.state == SCE_CSS_EXTENDED_PSEUDOELEMENT ||
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sc.state == SCE_CSS_UNKNOWN_PSEUDOCLASS ||
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sc.state == SCE_CSS_IMPORTANT ||
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sc.state == SCE_CSS_DIRECTIVE
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)) {
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char s[100];
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sc.GetCurrentLowered(s, sizeof(s));
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char *s2 = s;
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while (*s2 && !IsAWordChar(*s2))
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s2++;
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switch (sc.state) {
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case SCE_CSS_IDENTIFIER:
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case SCE_CSS_IDENTIFIER2:
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case SCE_CSS_IDENTIFIER3:
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case SCE_CSS_EXTENDED_IDENTIFIER:
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case SCE_CSS_UNKNOWN_IDENTIFIER:
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if (css1Props.InList(s2))
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sc.ChangeState(SCE_CSS_IDENTIFIER);
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else if (css2Props.InList(s2))
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sc.ChangeState(SCE_CSS_IDENTIFIER2);
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else if (css3Props.InList(s2))
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sc.ChangeState(SCE_CSS_IDENTIFIER3);
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else if (exProps.InList(s2))
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sc.ChangeState(SCE_CSS_EXTENDED_IDENTIFIER);
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else
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sc.ChangeState(SCE_CSS_UNKNOWN_IDENTIFIER);
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break;
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case SCE_CSS_PSEUDOCLASS:
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case SCE_CSS_PSEUDOELEMENT:
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case SCE_CSS_EXTENDED_PSEUDOCLASS:
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case SCE_CSS_EXTENDED_PSEUDOELEMENT:
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case SCE_CSS_UNKNOWN_PSEUDOCLASS:
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if (op == ':' && opPrev != ':' && pseudoClasses.InList(s2))
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sc.ChangeState(SCE_CSS_PSEUDOCLASS);
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else if (opPrev == ':' && pseudoElements.InList(s2))
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sc.ChangeState(SCE_CSS_PSEUDOELEMENT);
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else if ((op == ':' || (op == '(' && lastState == SCE_CSS_EXTENDED_PSEUDOCLASS)) && opPrev != ':' && exPseudoClasses.InList(s2))
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sc.ChangeState(SCE_CSS_EXTENDED_PSEUDOCLASS);
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else if (opPrev == ':' && exPseudoElements.InList(s2))
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sc.ChangeState(SCE_CSS_EXTENDED_PSEUDOELEMENT);
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else
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sc.ChangeState(SCE_CSS_UNKNOWN_PSEUDOCLASS);
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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
|
|
};
|
|
|
|
LexerModule lmCss(SCLEX_CSS, ColouriseCssDoc, "css", FoldCSSDoc, cssWordListDesc);
|