1023 lines
37 KiB
JavaScript
1023 lines
37 KiB
JavaScript
var mess, tree;
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if (typeof(window) === 'undefined') {
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mess = exports,
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tree = require('mess/tree');
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} else {
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if (typeof(window.mess) === 'undefined') { window.mess = {} }
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mess = window.mess,
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tree = window.mess.tree = {};
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}
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//
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// mess.js - parser
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//
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// A relatively straight-forward predictive parser.
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// There is no tokenization/lexing stage, the input is parsed
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// in one sweep.
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//
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// To make the parser fast enough to run in the browser, several
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// optimization had to be made:
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//
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// - Matching and slicing on a huge input is often cause of slowdowns.
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// The solution is to chunkify the input into smaller strings.
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// The chunks are stored in the `chunks` var,
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// `j` holds the current chunk index, and `current` holds
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// the index of the current chunk in relation to `input`.
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// This gives us an almost 4x speed-up.
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//
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// - In many cases, we don't need to match individual tokens;
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// for example, if a value doesn't hold any variables, operations
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// or dynamic references, the parser can effectively 'skip' it,
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// treating it as a literal.
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// An example would be '1px solid #000' - which evaluates to itself,
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// we don't need to know what the individual components are.
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// The drawback, of course is that you don't get the benefits of
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// syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
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// and a smaller speed-up in the code-gen.
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//
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//
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// Token matching is done with the `$` function, which either takes
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// a terminal string or regexp, or a non-terminal function to call.
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// It also takes care of moving all the indices forwards.
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//
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//
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mess.Parser = function Parser(env) {
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var input, // LeSS input string
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i, // current index in `input`
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j, // current chunk
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temp, // temporarily holds a chunk's state, for backtracking
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memo, // temporarily holds `i`, when backtracking
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furthest, // furthest index the parser has gone to
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chunks, // chunkified input
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current, // index of current chunk, in `input`
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parser;
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var that = this;
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// This function is called after all files
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// have been imported through `@import`.
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var finish = function() {};
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var imports = this.imports = {
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paths: env && env.paths || [], // Search paths, when importing
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queue: [], // Files which haven't been imported yet
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files: {}, // Holds the imported parse trees
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mime: env && env.mime, // MIME type of .mess files
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push: function(path, callback) {
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var that = this;
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this.queue.push(path);
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//
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// Import a file asynchronously
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//
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mess.Parser.importer(path, this.paths, function(root) {
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that.queue.splice(that.queue.indexOf(path), 1); // Remove the path from the queue
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that.files[path] = root; // Store the root
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callback(root);
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if (that.queue.length === 0) { finish() } // Call `finish` if we're done importing
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}, env);
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}
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};
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function save() { temp = chunks[j], memo = i, current = i }
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function restore() { chunks[j] = temp, i = memo, current = i }
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function sync() {
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if (i > current) {
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chunks[j] = chunks[j].slice(i - current);
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current = i;
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}
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}
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//
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// Parse from a token, regexp or string, and move forward if match
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//
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function $(tok) {
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var match, args, length, c, index, endIndex, k;
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//
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// Non-terminal
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//
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if (tok instanceof Function) {
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return tok.call(parser.parsers);
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//
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// Terminal
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//
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// Either match a single character in the input,
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// or match a regexp in the current chunk (chunk[j]).
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//
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} else if (typeof(tok) === 'string') {
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match = input.charAt(i) === tok ? tok : null;
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length = 1;
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sync();
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} else {
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sync();
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if (match = tok.exec(chunks[j])) {
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length = match[0].length;
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} else {
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return null;
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}
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}
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// The match is confirmed, add the match length to `i`,
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// and consume any extra white-space characters (' ' || '\n')
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// which come after that. The reason for this is that LeSS's
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// grammar is mostly white-space insensitive.
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//
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if (match) {
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mem = i += length;
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endIndex = i + chunks[j].length - length;
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while (i < endIndex) {
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c = input.charCodeAt(i);
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if (! (c === 32 || c === 10 || c === 9)) { break }
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i++;
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}
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chunks[j] = chunks[j].slice(length + (i - mem));
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current = i;
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if (chunks[j].length === 0 && j < chunks.length - 1) { j++ }
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if (typeof(match) === 'string') {
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return match;
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} else {
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return match.length === 1 ? match[0] : match;
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}
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}
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}
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// Same as $(), but don't change the state of the parser,
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// just return the match.
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function peek(tok) {
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if (typeof(tok) === 'string') {
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return input.charAt(i) === tok;
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} else {
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if (tok.test(chunks[j])) {
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return true;
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} else {
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return false;
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}
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}
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}
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this.env = env = env || {};
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// The optimization level dictates the thoroughness of the parser,
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// the lower the number, the mess nodes it will create in the tree.
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// This could matter for debugging, or if you want to access
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// the individual nodes in the tree.
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this.optimization = ('optimization' in this.env) ? this.env.optimization : 1;
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this.env.filename = this.env.filename || null;
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//
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// The Parser
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//
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return parser = {
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imports: imports,
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//
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// Parse an input string into an abstract syntax tree,
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// call `callback` when done.
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//
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parse: function(str, callback) {
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var root, start, end, zone, line, lines, buff = [], c, error = null;
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i = j = current = furthest = 0;
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chunks = [];
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input = str.replace(/\r\n/g, '\n');
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// Split the input into chunks.
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chunks = (function(chunks) {
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var j = 0,
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skip = /[^"'`\{\}\/]+/g,
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comment = /\/\*(?:[^*]|\*+[^\/*])*(?:\*+\/\n?|\**$)|\/\/.*/g,
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level = 0,
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match,
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chunk = chunks[0],
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inString;
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for (var i = 0, c, cc; i < input.length; i++) {
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skip.lastIndex = i;
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if (match = skip.exec(input)) {
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if (match.index === i) {
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i += match[0].length;
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chunk.push(match[0]);
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}
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}
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c = input.charAt(i);
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comment.lastIndex = i;
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if (!inString && c === '/') {
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cc = input.charAt(i + 1);
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if (cc === '/' || cc === '*') {
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if (match = comment.exec(input)) {
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if (match.index === i) {
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i += match[0].length;
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chunk.push(match[0]);
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c = input.charAt(i);
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}
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}
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}
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}
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if (c === '{' && !inString) { level++;
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chunk.push(c);
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} else if (c === '}' && !inString) { level--;
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chunk.push(c);
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chunks[++j] = chunk = [];
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} else {
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if (c === '"' || c === "'" || c === '`') {
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if (! inString) {
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inString = c;
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} else {
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inString = inString === c ? false : inString;
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}
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}
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chunk.push(c);
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}
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}
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if (level > 0) {
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throw {
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type: 'Syntax',
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message: 'Missing closing `}`',
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filename: env.filename
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}
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}
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return chunks.map(function(c) { return c.join('') });
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})([[]]);
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// Start with the primary rule.
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// The whole syntax tree is held under a Ruleset node,
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// with the `root` property set to true, so no `{}` are
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// output. The callback is called when the input is parsed.
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root = new(tree.Ruleset)([], $(this.parsers.primary));
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root.root = true;
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root.toCSS = (function(evaluate) {
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var line, lines, column;
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return function(options, variables) {
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options = options || {};
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var returnErrors = 'returnErrors' in options ?
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options.returnErrors : (env.returnErrors || false);
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env.errors = returnErrors ? [] : null;
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try {
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env.compress = env.compress || false;
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var css = evaluate.call(this, { frames: [] })
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.toCSS([], env);
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} catch (e) {
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lines = input.split('\n');
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line = getLine(e.index);
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for (var n = e.index, column = -1;
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n >= 0 && input.charAt(n) !== '\n';
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n--) { column++ }
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throw {
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type: e.type,
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message: e.message,
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filename: env.filename,
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index: e.index,
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line: typeof(line) === 'number' ? line + 1 : null,
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callLine: e.call && (getLine(e.call) + 1),
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callExtract: lines[getLine(e.call)],
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stack: e.stack,
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column: column,
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extract: [
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lines[line - 1],
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lines[line],
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lines[line + 1]
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]
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}
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}
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return css;
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function getLine(index) {
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return index ? (input.slice(0, index).match(/\n/g) || '').length : null;
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}
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};
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})(root.eval);
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/**
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* Get an array of Ruleset objects, flattened
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* and sorted according to specificitySort
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*/
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root.toMSS = (function() {
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var line, lines, column;
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return function(options, variables) {
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options = options || {};
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options.compress = 'compress' in options ?
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options.compress : (env.compress || false);
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try {
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var definitions = this.flatten([]);
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definitions.sort(specificitySort);
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return definitions;
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}
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catch (e) {
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lines = input.split('\n');
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line = getLine(e.index);
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for (var n = e.index, column = -1;
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n >= 0 && input.charAt(n) !== '\n';
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n--) { column++ }
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throw {
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type: e.type,
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message: e.message,
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filename: env.filename,
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index: e.index,
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line: typeof(line) === 'number' ? line + 1 : null,
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callLine: e.call && (getLine(e.call) + 1),
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callExtract: lines[getLine(e.call)],
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stack: e.stack,
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column: column,
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extract: [
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lines[line - 1],
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lines[line],
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lines[line + 1]
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]
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}
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}
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function getLine(index) {
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return index ? (input.slice(0, index).match(/\n/g) || '').length : null;
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}
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};
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})();
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/**
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* Sort rules by specificity: this function expects selectors to be
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* split already.
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*
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* Written to be used as a .sort(Function);
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* argument.
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*
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* [1, 0, 0, 467] > [0, 0, 1, 520]
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*/
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var specificitySort = function(a, b) {
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var as = a.selector.specificity();
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var bs = b.selector.specificity();
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for (var i = 0; i < as.length; i++) {
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if (as[i] < bs[i]) return true;
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if (as[i] > bs[i]) break;
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}
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};
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// If `i` is smaller than the `input.length - 1`,
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// it means the parser wasn't able to parse the whole
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// string, so we've got a parsing error.
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//
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// We try to extract a \n delimited string,
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// showing the line where the parse error occured.
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// We split it up into two parts (the part which parsed,
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// and the part which didn't), so we can color them differently.
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if (i < input.length - 1) {
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i = furthest;
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lines = input.split('\n');
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line = (input.slice(0, i).match(/\n/g) || '').length + 1;
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for (var n = i, column = -1; n >= 0 && input.charAt(n) !== '\n'; n--) { column++ }
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error = {
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name: 'ParseError',
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message: 'Syntax Error on line ' + line,
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filename: env.filename,
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line: line,
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column: column,
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extract: [
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lines[line - 2],
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lines[line - 1],
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lines[line]
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]
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};
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}
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if (this.imports.queue.length > 0) {
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finish = function() { callback(error, root) };
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} else {
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callback(error, root);
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}
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},
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//
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// Here in, the parsing rules/functions
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//
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// The basic structure of the syntax tree generated is as follows:
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//
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// Ruleset -> Rule -> Value -> Expression -> Entity
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//
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// Here's some LESS code:
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//
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// .class {
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// color: #fff;
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// border: 1px solid #000;
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// width: @w + 4px;
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// > .child {...}
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// }
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//
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// And here's what the parse tree might look like:
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//
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// Ruleset (Selector '.class', [
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// Rule ("color", Value ([Expression [Color #fff]]))
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// Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
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// Rule ("width", Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
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// Ruleset (Selector [Element '>', '.child'], [...])
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// ])
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//
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// In general, most rules will try to parse a token with the `$()` function, and if the return
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// value is truly, will return a new node, of the relevant type. Sometimes, we need to check
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// first, before parsing, that's when we use `peek()`.
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//
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parsers: {
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//
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// The `primary` rule is the *entry* and *exit* point of the parser.
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// The rules here can appear at any level of the parse tree.
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//
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// The recursive nature of the grammar is an interplay between the `block`
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// rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
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// as represented by this simplified grammar:
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//
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// primary → (ruleset | rule)+
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// ruleset → selector+ block
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// block → '{' primary '}'
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//
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// Only at one point is the primary rule not called from the
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// block rule: at the root level.
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//
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primary: function() {
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var node, root = [];
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while ((node = $(this.mixin.definition) || $(this.rule) || $(this.ruleset) ||
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$(this.mixin.call) || $(this.comment))
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|| $(/^[\s\n]+/)) {
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node && root.push(node);
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}
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return root;
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},
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// We create a Comment node for CSS comments `/* */`,
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// but keep the LeSS comments `//` silent, by just skipping
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// over them.
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comment: function() {
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var comment;
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if (input.charAt(i) !== '/') return;
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if (input.charAt(i + 1) === '/') {
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return new(tree.Comment)($(/^\/\/.*/), true);
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} else if (comment = $(/^\/\*(?:[^*]|\*+[^\/*])*(?:\*+\/\n?|\**$)/)) {
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return new(tree.Comment)(comment);
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}
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},
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//
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// Entities are tokens which can be found inside an Expression
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//
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entities: {
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//
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// A string, which supports escaping " and '
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//
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// "milky way" 'he\'s the one!'
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//
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quoted: function() {
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var str;
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if (input.charAt(i) !== '"' && input.charAt(i) !== "'") return;
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if (str = $(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/)) {
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return new(tree.Quoted)(str[0], str[1] || str[2]);
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}
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},
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comparison: function() {
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var str;
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// todo: <=
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if (str = $(/^=|<=|>=|<|>/)) {
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return new(tree.Comparison)(str);
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}
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},
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//
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// A catch-all word, such as:
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//
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// black border-collapse
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//
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keyword: function() {
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var k;
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if (k = $(/^[A-Za-z-]+/)) { return new(tree.Keyword)(k) }
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},
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//
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// A function call
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//
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// rgb(255, 0, 255)
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//
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// The arguments are parsed with the `entities.arguments` parser.
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//
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call: function() {
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var name, args;
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if (! (name = /^([\w-]+|%)\(/.exec(chunks[j]))) return;
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name = name[1].toLowerCase();
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if (name === 'url') { return null }
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else { i += name.length + 1 }
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args = $(this.entities.arguments);
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if (! $(')')) return;
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if (name) { return new(tree.Call)(name, args) }
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},
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arguments: function() {
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var args = [], arg;
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while (arg = $(this.expression)) {
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args.push(arg);
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if (! $(',')) { break }
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}
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return args;
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},
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literal: function() {
|
|
return $(this.entities.dimension) ||
|
|
$(this.entities.color) ||
|
|
$(this.entities.quoted);
|
|
},
|
|
|
|
//
|
|
// Parse url() tokens
|
|
//
|
|
// We use a specific rule for urls, because they don't really behave like
|
|
// standard function calls. The difference is that the argument doesn't have
|
|
// to be enclosed within a string, so it can't be parsed as an Expression.
|
|
//
|
|
url: function() {
|
|
var value;
|
|
|
|
if (input.charAt(i) !== 'u' || !$(/^url\(/)) return;
|
|
value = $(this.entities.quoted) || $(this.entities.variable) ||
|
|
$(/^[-\w%@$\/.&=:;#+?]+/) || '';
|
|
if (! $(')')) throw new(Error)('missing closing ) for url()');
|
|
|
|
return new(tree.URL)((value.value || value.data || value instanceof tree.Variable)
|
|
? value : new(tree.Anonymous)(value), imports.paths);
|
|
},
|
|
|
|
//
|
|
// A Variable entity, such as `@fink`, in
|
|
//
|
|
// width: @fink + 2px
|
|
//
|
|
// We use a different parser for variable definitions,
|
|
// see `parsers.variable`.
|
|
//
|
|
variable: function() {
|
|
var name, index = i;
|
|
|
|
if (input.charAt(i) === '@' && (name = $(/^@[\w-]+/))) {
|
|
return new(tree.Variable)(name, index);
|
|
}
|
|
},
|
|
|
|
//
|
|
// A Hexadecimal color
|
|
//
|
|
// #4F3C2F
|
|
//
|
|
// `rgb` and `hsl` colors are parsed through the `entities.call` parser.
|
|
//
|
|
color: function() {
|
|
var rgb;
|
|
|
|
if (input.charAt(i) === '#' && (rgb = $(/^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})/))) {
|
|
return new(tree.Color)(rgb[1]);
|
|
}
|
|
},
|
|
|
|
//
|
|
// A Dimension, that is, a number and a unit
|
|
//
|
|
// 0.5em 95%
|
|
//
|
|
dimension: function() {
|
|
var value, c = input.charCodeAt(i);
|
|
if ((c > 57 || c < 45) || c === 47) return;
|
|
|
|
if (value = $(/^(-?\d*\.?\d+)(px|%|em|pc|ex|in|deg|s|ms|pt|cm|mm|rad|grad|turn)?/)) {
|
|
return new(tree.Dimension)(value[1], value[2]);
|
|
}
|
|
},
|
|
|
|
//
|
|
// JavaScript code to be evaluated
|
|
//
|
|
// `window.location.href`
|
|
//
|
|
javascript: function() {
|
|
var str;
|
|
|
|
if (input.charAt(i) !== '`') { return }
|
|
|
|
if (str = $(/^`([^`]*)`/)) {
|
|
return new(tree.JavaScript)(str[1], i);
|
|
}
|
|
}
|
|
},
|
|
|
|
//
|
|
// The variable part of a variable definition. Used in the `rule` parser
|
|
//
|
|
// @fink:
|
|
//
|
|
variable: function() {
|
|
var name;
|
|
|
|
if (input.charAt(i) === '@' && (name = $(/^(@[\w-]+)\s*:/))) { return name[1] }
|
|
},
|
|
|
|
//
|
|
// A font size/line-height shorthand
|
|
//
|
|
// small/12px
|
|
//
|
|
// We need to peek first, or we'll match on keywords and dimensions
|
|
//
|
|
shorthand: function() {
|
|
var a, b;
|
|
|
|
if (! peek(/^[@\w.%-]+\/[@\w.-]+/)) return;
|
|
|
|
if ((a = $(this.entity)) && $('/') && (b = $(this.entity))) {
|
|
return new(tree.Shorthand)(a, b);
|
|
}
|
|
},
|
|
|
|
//
|
|
// Mixins
|
|
//
|
|
mixin: {
|
|
//
|
|
// A Mixin call, with an optional argument list
|
|
//
|
|
// #mixins > .square(#fff);
|
|
// .rounded(4px, black);
|
|
// .button;
|
|
//
|
|
// The `while` loop is there because mixins can be
|
|
// namespaced, but we only support the child and descendant
|
|
// selector for now.
|
|
//
|
|
call: function() {
|
|
var elements = [], e, c, args, index = i, s = input.charAt(i);
|
|
|
|
if (s !== '.' && s !== '#') { return }
|
|
|
|
while (e = $(/^[#.](?:[\w-]|\\(?:[a-fA-F0-9]{1,6} ?|[^a-fA-F0-9]))+/)) {
|
|
elements.push(new(tree.Element)(c, e));
|
|
c = $('>');
|
|
}
|
|
$('(') && (args = $(this.entities.arguments)) && $(')');
|
|
|
|
if (elements.length > 0 && ($(';') || peek('}'))) {
|
|
throw 'Calls are not yet supported';
|
|
return new(tree.mixin.Call)(elements, args, index);
|
|
}
|
|
},
|
|
|
|
//
|
|
// A Mixin definition, with a list of parameters
|
|
//
|
|
// .rounded (@radius: 2px, @color) {
|
|
// ...
|
|
// }
|
|
//
|
|
// Until we have a finer grained state-machine, we have to
|
|
// do a look-ahead, to make sure we don't have a mixin call.
|
|
// See the `rule` function for more information.
|
|
//
|
|
// We start by matching `.rounded (`, and then proceed on to
|
|
// the argument list, which has optional default values.
|
|
// We store the parameters in `params`, with a `value` key,
|
|
// if there is a value, such as in the case of `@radius`.
|
|
//
|
|
// Once we've got our params list, and a closing `)`, we parse
|
|
// the `{...}` block.
|
|
//
|
|
definition: function() {
|
|
var name, params = [], match, ruleset, param, value;
|
|
|
|
if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
|
|
peek(/^[^{]*(;|})/)) return;
|
|
|
|
if (match = $(/^([#.](?:[\w-]|\\(?:[a-fA-F0-9]{1,6} ?|[^a-fA-F0-9]))+)\s*\(/)) {
|
|
name = match[1];
|
|
|
|
while (param = $(this.entities.variable) || $(this.entities.literal)
|
|
|| $(this.entities.keyword)) {
|
|
// Variable
|
|
if (param instanceof tree.Variable) {
|
|
if ($(':')) {
|
|
if (value = $(this.expression)) {
|
|
params.push({ name: param.name, value: value });
|
|
} else {
|
|
throw new(Error)('Expected value');
|
|
}
|
|
} else {
|
|
params.push({ name: param.name });
|
|
}
|
|
} else {
|
|
params.push({ value: param });
|
|
}
|
|
if (! $(',')) { break }
|
|
}
|
|
if (! $(')')) throw new(Error)('Expected )');
|
|
|
|
ruleset = $(this.block);
|
|
|
|
if (ruleset) {
|
|
throw 'Definitions should not exist here';
|
|
return new(tree.mixin.Definition)(name, params, ruleset);
|
|
}
|
|
}
|
|
}
|
|
},
|
|
|
|
//
|
|
// Entities are the smallest recognized token,
|
|
// and can be found inside a rule's value.
|
|
//
|
|
entity: function() {
|
|
return $(this.entities.literal) || $(this.entities.variable) || $(this.entities.url) ||
|
|
$(this.entities.call) || $(this.entities.keyword) || $(this.entities.javascript);
|
|
},
|
|
|
|
//
|
|
// A Rule terminator. Note that we use `peek()` to check for '}',
|
|
// because the `block` rule will be expecting it, but we still need to make sure
|
|
// it's there, if ';' was ommitted.
|
|
//
|
|
end: function() {
|
|
return $(';') || peek('}');
|
|
},
|
|
|
|
//
|
|
// A Selector Element
|
|
//
|
|
// div
|
|
// + h1
|
|
// #socks
|
|
// input[type="text"]
|
|
//
|
|
// Elements are the building blocks for Selectors. They consist of
|
|
// an element name, such as a tag a class, or `*`.
|
|
//
|
|
element: function() {
|
|
var e, t;
|
|
|
|
e = $(/^(?:[.#]?|:*)(?:[\w-]|\\(?:[a-fA-F0-9]{1,6} ?|[^a-fA-F0-9]))+/) ||
|
|
$('*') || $(/^\([^)@]+\)/);
|
|
|
|
if (e) { return new(tree.Element)(e) }
|
|
},
|
|
|
|
//
|
|
// A CSS Selector
|
|
//
|
|
// .class > div + h1
|
|
// li a:hover
|
|
//
|
|
// Selectors are made out of one or more Elements, see above.
|
|
//
|
|
selector: function() {
|
|
var sel, e, elements = [], c, match;
|
|
|
|
while (e = $(this.element)) {
|
|
c = input.charAt(i);
|
|
elements.push(e);
|
|
if (c === '{' || c === '}' || c === ';' || c === ',') { break }
|
|
}
|
|
|
|
if (elements.length > 0 || input.charAt(i) == '[') {
|
|
return new tree.Selector(elements, memo);
|
|
}
|
|
},
|
|
|
|
tag: function() {
|
|
return $(/^[a-zA-Z][a-zA-Z-]*[0-9]?/) || $('*');
|
|
},
|
|
|
|
label: function() {
|
|
return $(/^[0-9a-zA-Z-_]+/);
|
|
},
|
|
|
|
filter: function() {
|
|
save();
|
|
if (! $('[')) return;
|
|
if (key = $(/^[a-zA-Z0-9-_]+/) || $(this.entities.quoted)) {
|
|
if ((op = $(this.entities.comparison)) &&
|
|
(val = $(this.entities.quoted) || $(/^[\w-]+/))) {
|
|
if (! $(']')) return;
|
|
if (key == 'zoom') {
|
|
return new(tree.ZoomFilter)(key, op, val, memo);
|
|
} else {
|
|
return new(tree.Filter)(key, op, val, memo);
|
|
}
|
|
}
|
|
}
|
|
},
|
|
|
|
//
|
|
// The `block` rule is used by `ruleset` and `mixin.definition`.
|
|
// It's a wrapper around the `primary` rule, with added `{}`.
|
|
//
|
|
block: function() {
|
|
var content;
|
|
|
|
if ($('{') && (content = $(this.primary)) && $('}')) {
|
|
return content;
|
|
}
|
|
},
|
|
|
|
//
|
|
// div, .class, body > p {...}
|
|
//
|
|
ruleset: function() {
|
|
var selectors = [], s, f, l, rules, filters = [];
|
|
save();
|
|
|
|
while (s = $(this.selector)) {
|
|
while (f = $(this.filter)) {
|
|
s.filters.push(f);
|
|
}
|
|
if (l = $(this.label)) {
|
|
s.label = l;
|
|
}
|
|
selectors.push(s);
|
|
if (! $(',')) { break }
|
|
}
|
|
if (s) $(this.comment);
|
|
|
|
if (selectors.length > 0 && (rules = $(this.block))) {
|
|
if (selectors.length === 1 &&
|
|
selectors[0].elements.length &&
|
|
selectors[0].elements[0].value === 'Map') {
|
|
var rs = new(tree.Ruleset)(selectors, rules);
|
|
rs.is_map = true;
|
|
return rs;
|
|
}
|
|
return new(tree.Ruleset)(selectors, rules);
|
|
} else {
|
|
// Backtrack
|
|
restore();
|
|
}
|
|
},
|
|
rule: function() {
|
|
var name, value, c = input.charAt(i), important;
|
|
save();
|
|
|
|
if (c === '.' || c === '#' || c === '&') { return }
|
|
|
|
if (name = $(this.variable) || $(this.property)) {
|
|
value = $(this.value);
|
|
important = $(this.important);
|
|
|
|
if (value && $(this.end)) {
|
|
return new(tree.Rule)(name, value, important, memo);
|
|
} else {
|
|
furthest = i;
|
|
restore();
|
|
}
|
|
}
|
|
},
|
|
|
|
font: function() {
|
|
var value = [], expression = [], weight, shorthand, font, e;
|
|
|
|
while (e = $(this.shorthand) || $(this.entity)) {
|
|
expression.push(e);
|
|
}
|
|
value.push(new(tree.Expression)(expression));
|
|
|
|
if ($(',')) {
|
|
while (e = $(this.expression)) {
|
|
value.push(e);
|
|
if (! $(',')) { break }
|
|
}
|
|
}
|
|
return new(tree.Value)(value);
|
|
},
|
|
|
|
//
|
|
// A Value is a comma-delimited list of Expressions
|
|
//
|
|
// font-family: Baskerville, Georgia, serif;
|
|
//
|
|
// In a Rule, a Value represents everything after the `:`,
|
|
// and before the `;`.
|
|
//
|
|
value: function() {
|
|
var e, expressions = [], important;
|
|
|
|
while (e = $(this.expression)) {
|
|
expressions.push(e);
|
|
if (! $(',')) { break }
|
|
}
|
|
|
|
if (expressions.length > 0) {
|
|
return new(tree.Value)(expressions);
|
|
}
|
|
},
|
|
important: function() {
|
|
if (input.charAt(i) === '!') {
|
|
return $(/^! *important/);
|
|
}
|
|
},
|
|
sub: function() {
|
|
var e;
|
|
|
|
if ($('(') && (e = $(this.expression)) && $(')')) {
|
|
return e;
|
|
}
|
|
},
|
|
multiplication: function() {
|
|
var m, a, op, operation;
|
|
if (m = $(this.operand)) {
|
|
while ((op = ($('/') || $('*'))) && (a = $(this.operand))) {
|
|
operation = new(tree.Operation)(op, [operation || m, a]);
|
|
}
|
|
return operation || m;
|
|
}
|
|
},
|
|
addition: function() {
|
|
var m, a, op, operation;
|
|
if (m = $(this.multiplication)) {
|
|
while ((op = $(/^[-+]\s+/) || (input.charAt(i - 1) != ' ' && ($('+') || $('-')))) &&
|
|
(a = $(this.multiplication))) {
|
|
operation = new(tree.Operation)(op, [operation || m, a]);
|
|
}
|
|
return operation || m;
|
|
}
|
|
},
|
|
|
|
//
|
|
// An operand is anything that can be part of an operation,
|
|
// such as a Color, or a Variable
|
|
//
|
|
operand: function() {
|
|
return $(this.sub) || $(this.entities.dimension) ||
|
|
$(this.entities.color) || $(this.entities.variable) ||
|
|
$(this.entities.call);
|
|
},
|
|
|
|
//
|
|
// Expressions either represent mathematical operations,
|
|
// or white-space delimited Entities.
|
|
//
|
|
// 1px solid black
|
|
// @var * 2
|
|
//
|
|
expression: function() {
|
|
var e, delim, entities = [], d;
|
|
|
|
while (e = $(this.addition) || $(this.entity)) {
|
|
entities.push(e);
|
|
}
|
|
if (entities.length > 0) {
|
|
return new(tree.Expression)(entities);
|
|
}
|
|
},
|
|
property: function() {
|
|
var name;
|
|
|
|
if (name = $(/^(\*?-?[-a-z_0-9]+)\s*:/)) {
|
|
return name[1];
|
|
}
|
|
}
|
|
}
|
|
};
|
|
};
|
|
|
|
if (typeof(window) !== 'undefined') {
|
|
//
|
|
// Used by `@import` directives
|
|
//
|
|
mess.Parser.importer = function(path, paths, callback, env) {
|
|
if (path.charAt(0) !== '/' && paths.length > 0) {
|
|
path = paths[0] + path;
|
|
}
|
|
// We pass `true` as 3rd argument, to force the reload of the import.
|
|
// This is so we can get the syntax tree as opposed to just the CSS output,
|
|
// as we need this to evaluate the current stylesheet.
|
|
loadStyleSheet({ href: path, title: path, type: env.mime }, callback, true);
|
|
};
|
|
}
|