495 lines
8.1 KiB
JavaScript
495 lines
8.1 KiB
JavaScript
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module.exports = function(css, options){
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options = options || {};
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/**
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* Positional.
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*/
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var lineno = 1;
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var column = 1;
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/**
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* Update lineno and column based on `str`.
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*/
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function updatePosition(str) {
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var lines = str.match(/\n/g);
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if (lines) lineno += lines.length;
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var i = str.lastIndexOf('\n');
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column = ~i ? str.length - i : column + str.length;
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}
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/**
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* Mark position and patch `node.position`.
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*/
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function position() {
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var start = { line: lineno, column: column };
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if (!options.position) return positionNoop;
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return function(node){
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node.position = {
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start: start,
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end: { line: lineno, column: column },
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source: options.source
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};
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whitespace();
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return node;
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}
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}
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/**
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* Return `node`.
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*/
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function positionNoop(node) {
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whitespace();
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return node;
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}
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/**
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* Error `msg`.
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*/
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function error(msg) {
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var err = new Error(msg + ' near line ' + lineno + ':' + column);
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err.filename = options.source;
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err.line = lineno;
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err.column = column;
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err.source = css;
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throw err;
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}
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/**
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* Parse stylesheet.
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*/
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function stylesheet() {
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return {
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type: 'stylesheet',
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stylesheet: {
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rules: rules()
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}
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};
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}
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/**
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* Opening brace.
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*/
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function open() {
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return match(/^{\s*/);
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}
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/**
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* Closing brace.
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*/
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function close() {
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return match(/^}/);
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}
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/**
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* Parse ruleset.
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*/
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function rules() {
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var node;
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var rules = [];
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whitespace();
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comments(rules);
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while (css.charAt(0) != '}' && (node = atrule() || rule())) {
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rules.push(node);
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comments(rules);
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}
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return rules;
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}
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/**
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* Match `re` and return captures.
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*/
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function match(re) {
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var m = re.exec(css);
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if (!m) return;
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var str = m[0];
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updatePosition(str);
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css = css.slice(str.length);
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return m;
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}
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/**
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* Parse whitespace.
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*/
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function whitespace() {
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match(/^\s*/);
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}
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/**
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* Parse comments;
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*/
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function comments(rules) {
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var c;
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rules = rules || [];
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while (c = comment()) rules.push(c);
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return rules;
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}
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/**
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* Parse comment.
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*/
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function comment() {
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var pos = position();
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if ('/' != css.charAt(0) || '*' != css.charAt(1)) return;
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var i = 2;
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while (null != css.charAt(i) && ('*' != css.charAt(i) || '/' != css.charAt(i + 1))) ++i;
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i += 2;
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var str = css.slice(2, i - 2);
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column += 2;
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updatePosition(str);
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css = css.slice(i);
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column += 2;
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return pos({
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type: 'comment',
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comment: str
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});
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}
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/**
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* Parse selector.
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*/
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function selector() {
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var m = match(/^([^{]+)/);
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if (!m) return;
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return trim(m[0]).split(/\s*,\s*/);
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}
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/**
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* Parse declaration.
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*/
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function declaration() {
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var pos = position();
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// prop
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var prop = match(/^(\*?[-#\/\*\w]+(\[[0-9a-z_-]+\])?)\s*/);
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if (!prop) return;
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prop = trim(prop[0]);
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// :
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if (!match(/^:\s*/)) return error("property missing ':'");
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// val
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var val = match(/^((?:'(?:\\'|.)*?'|"(?:\\"|.)*?"|\([^\)]*?\)|[^};])+)/);
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if (!val) return error('property missing value');
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var ret = pos({
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type: 'declaration',
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property: prop,
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value: trim(val[0])
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});
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// ;
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match(/^[;\s]*/);
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return ret;
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}
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/**
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* Parse declarations.
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*/
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function declarations() {
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var decls = [];
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if (!open()) return error("missing '{'");
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comments(decls);
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// declarations
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var decl;
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while (decl = declaration()) {
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decls.push(decl);
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comments(decls);
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}
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if (!close()) return error("missing '}'");
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return decls;
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}
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/**
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* Parse keyframe.
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*/
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function keyframe() {
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var m;
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var vals = [];
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var pos = position();
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while (m = match(/^((\d+\.\d+|\.\d+|\d+)%?|[a-z]+)\s*/)) {
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vals.push(m[1]);
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match(/^,\s*/);
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}
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if (!vals.length) return;
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return pos({
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type: 'keyframe',
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values: vals,
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declarations: declarations()
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});
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}
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/**
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* Parse keyframes.
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*/
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function atkeyframes() {
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var pos = position();
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var m = match(/^@([-\w]+)?keyframes */);
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if (!m) return;
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var vendor = m[1];
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// identifier
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var m = match(/^([-\w]+)\s*/);
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if (!m) return error("@keyframes missing name");
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var name = m[1];
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if (!open()) return error("@keyframes missing '{'");
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var frame;
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var frames = comments();
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while (frame = keyframe()) {
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frames.push(frame);
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frames = frames.concat(comments());
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}
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if (!close()) return error("@keyframes missing '}'");
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return pos({
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type: 'keyframes',
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name: name,
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vendor: vendor,
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keyframes: frames
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});
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}
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/**
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* Parse supports.
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*/
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function atsupports() {
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var pos = position();
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var m = match(/^@supports *([^{]+)/);
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if (!m) return;
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var supports = trim(m[1]);
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if (!open()) return error("@supports missing '{'");
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var style = comments().concat(rules());
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if (!close()) return error("@supports missing '}'");
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return pos({
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type: 'supports',
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supports: supports,
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rules: style
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});
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}
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/**
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* Parse host.
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*/
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function athost() {
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var pos = position();
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var m = match(/^@host */);
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if (!m) return;
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if (!open()) return error("@host missing '{'");
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var style = comments().concat(rules());
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if (!close()) return error("@host missing '}'");
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return pos({
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type: 'host',
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rules: style
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});
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}
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/**
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* Parse media.
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*/
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function atmedia() {
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var pos = position();
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var m = match(/^@media *([^{]+)/);
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if (!m) return;
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var media = trim(m[1]);
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if (!open()) return error("@media missing '{'");
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var style = comments().concat(rules());
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if (!close()) return error("@media missing '}'");
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return pos({
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type: 'media',
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media: media,
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rules: style
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});
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}
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/**
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* Parse paged media.
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*/
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function atpage() {
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var pos = position();
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var m = match(/^@page */);
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if (!m) return;
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var sel = selector() || [];
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if (!open()) return error("@page missing '{'");
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var decls = comments();
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// declarations
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var decl;
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while (decl = declaration()) {
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decls.push(decl);
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decls = decls.concat(comments());
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}
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if (!close()) return error("@page missing '}'");
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return pos({
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type: 'page',
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selectors: sel,
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declarations: decls
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});
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}
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/**
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* Parse document.
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*/
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function atdocument() {
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var pos = position();
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var m = match(/^@([-\w]+)?document *([^{]+)/);
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if (!m) return;
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var vendor = trim(m[1]);
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var doc = trim(m[2]);
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if (!open()) return error("@document missing '{'");
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var style = comments().concat(rules());
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if (!close()) return error("@document missing '}'");
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return pos({
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type: 'document',
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document: doc,
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vendor: vendor,
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rules: style
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});
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}
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/**
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* Parse import
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*/
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function atimport() {
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return _atrule('import');
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}
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/**
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* Parse charset
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*/
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function atcharset() {
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return _atrule('charset');
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}
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/**
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* Parse namespace
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*/
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function atnamespace() {
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return _atrule('namespace')
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}
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/**
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* Parse non-block at-rules
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*/
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function _atrule(name) {
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var pos = position();
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var m = match(new RegExp('^@' + name + ' *([^;\\n]+);'));
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if (!m) return;
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var ret = { type: name };
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ret[name] = trim(m[1]);
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return pos(ret);
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}
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/**
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* Parse at rule.
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*/
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function atrule() {
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if (css[0] != '@') return;
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return atkeyframes()
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|| atmedia()
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|| atsupports()
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|| atimport()
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|| atcharset()
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|| atnamespace()
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|| atdocument()
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|| atpage()
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|| athost();
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}
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/**
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* Parse rule.
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*/
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function rule() {
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var pos = position();
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var sel = selector();
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if (!sel) return;
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comments();
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return pos({
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type: 'rule',
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selectors: sel,
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declarations: declarations()
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});
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}
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return stylesheet();
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};
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/**
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* Trim `str`.
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*/
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function trim(str) {
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return str ? str.replace(/^\s+|\s+$/g, '') : '';
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}
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