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/* Simple parser for CSS */
var CSSParser = Editor.Parser = (function() {
var tokenizeCSS = (function() {
function normal(source, setState) {
var ch = source.next();
if (ch == "@") {
source.nextWhileMatches(/\w/);
return "css-at";
}
else if (ch == "/" && source.equals("*")) {
setState(inCComment);
return null;
}
else if (ch == "<" && source.equals("!")) {
setState(inSGMLComment);
return null;
}
else if (ch == "=") {
return "css-compare";
}
else if (source.equals("=") && (ch == "~" || ch == "|")) {
source.next();
return "css-compare";
}
else if (ch == "\"" || ch == "'") {
setState(inString(ch));
return null;
}
else if (ch == "#") {
source.nextWhileMatches(/\w/);
return "css-hash";
}
else if (ch == "!") {
source.nextWhileMatches(/[ \t]/);
source.nextWhileMatches(/\w/);
return "css-important";
}
else if (/\d/.test(ch)) {
source.nextWhileMatches(/[\w.%]/);
return "css-unit";
}
else if (/[,.+>*\/]/.test(ch)) {
return "css-select-op";
}
else if (/[;{}:\[\]]/.test(ch)) {
return "css-punctuation";
}
else {
source.nextWhileMatches(/[\w\\\-_]/);
return "css-identifier";
}
}
function inCComment(source, setState) {
var maybeEnd = false;
while (!source.endOfLine()) {
var ch = source.next();
if (maybeEnd && ch == "/") {
setState(normal);
break;
}
maybeEnd = (ch == "*");
}
return "css-comment";
}
function inSGMLComment(source, setState) {
var dashes = 0;
while (!source.endOfLine()) {
var ch = source.next();
if (dashes >= 2 && ch == ">") {
setState(normal);
break;
}
dashes = (ch == "-") ? dashes + 1 : 0;
}
return "css-comment";
}
function inString(quote) {
return function(source, setState) {
var escaped = false;
while (!source.endOfLine()) {
var ch = source.next();
if (ch == quote && !escaped)
break;
escaped = !escaped && ch == "\\";
}
if (!escaped)
setState(normal);
return "css-string";
};
}
return function(source, startState) {
return tokenizer(source, startState || normal);
};
})();
function indentCSS(inBraces, inRule, base) {
return function(nextChars) {
if (!inBraces || /^\}/.test(nextChars)) return base;
else if (inRule) return base + indentUnit * 2;
else return base + indentUnit;
};
}
// This is a very simplistic parser -- since CSS does not really
// nest, it works acceptably well, but some nicer colouroing could
// be provided with a more complicated parser.
function parseCSS(source, basecolumn) {
basecolumn = basecolumn || 0;
var tokens = tokenizeCSS(source);
var inBraces = false, inRule = false, inDecl = false;;
var iter = {
next: function() {
var token = tokens.next(), style = token.style, content = token.content;
if (style == "css-hash")
style = token.style = inRule ? "css-colorcode" : "css-identifier";
if (style == "css-identifier") {
if (inRule) token.style = "css-value";
else if (!inBraces && !inDecl) token.style = "css-selector";
}
if (content == "\n")
token.indentation = indentCSS(inBraces, inRule, basecolumn);
if (content == "{" && inDecl == "@media")
inDecl = false;
else if (content == "{")
inBraces = true;
else if (content == "}")
inBraces = inRule = inDecl = false;
else if (content == ";")
inRule = inDecl = false;
else if (inBraces && style != "css-comment" && style != "whitespace")
inRule = true;
else if (!inBraces && style == "css-at")
inDecl = content;
return token;
},
copy: function() {
var _inBraces = inBraces, _inRule = inRule, _tokenState = tokens.state;
return function(source) {
tokens = tokenizeCSS(source, _tokenState);
inBraces = _inBraces;
inRule = _inRule;
return iter;
};
}
};
return iter;
}
return {make: parseCSS, electricChars: "}"};
})();
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