Fully end to end encrypted anonymous chat program. Server only stores public key lookup for users and the encrypted messages. No credentials are transfered to the server, but kept in local browser storage. This allows 100% safe chatting.
https://safechat.ch
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
882 lines
18 KiB
882 lines
18 KiB
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/*! |
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* Stylus - Lexer |
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* Copyright (c) Automattic <developer.wordpress.com> |
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* MIT Licensed |
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*/ |
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/** |
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* Module dependencies. |
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*/ |
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var Token = require('./token') |
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, nodes = require('./nodes') |
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, errors = require('./errors'); |
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/** |
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* Expose `Lexer`. |
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*/ |
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exports = module.exports = Lexer; |
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/** |
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* Operator aliases. |
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*/ |
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var alias = { |
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'and': '&&' |
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, 'or': '||' |
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, 'is': '==' |
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, 'isnt': '!=' |
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, 'is not': '!=' |
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, ':=': '?=' |
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}; |
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/** |
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* Initialize a new `Lexer` with the given `str` and `options`. |
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* |
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* @param {String} str |
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* @param {Object} options |
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* @api private |
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*/ |
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function Lexer(str, options) { |
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options = options || {}; |
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this.stash = []; |
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this.indentStack = []; |
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this.indentRe = null; |
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this.lineno = 1; |
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this.column = 1; |
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// HACK! |
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function comment(str, val, offset, s) { |
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var inComment = s.lastIndexOf('/*', offset) > s.lastIndexOf('*/', offset) |
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, commentIdx = s.lastIndexOf('//', offset) |
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, i = s.lastIndexOf('\n', offset) |
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, double = 0 |
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, single = 0; |
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if (~commentIdx && commentIdx > i) { |
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while (i != offset) { |
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if ("'" == s[i]) single ? single-- : single++; |
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if ('"' == s[i]) double ? double-- : double++; |
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if ('/' == s[i] && '/' == s[i + 1]) { |
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inComment = !single && !double; |
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break; |
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} |
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++i; |
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} |
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} |
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return inComment |
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? str |
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: val + '\r'; |
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}; |
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// Remove UTF-8 BOM. |
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if ('\uFEFF' == str.charAt(0)) str = str.slice(1); |
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this.str = str |
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.replace(/\s+$/, '\n') |
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.replace(/\r\n?/g, '\n') |
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.replace(/\\ *\n/g, '\r') |
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.replace(/([,(:](?!\/\/[^ ])) *(?:\/\/[^\n]*|\/\*.*?\*\/)?\n\s*/g, comment) |
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.replace(/\s*\n[ \t]*([,)])/g, comment); |
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}; |
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/** |
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* Lexer prototype. |
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*/ |
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Lexer.prototype = { |
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/** |
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* Custom inspect. |
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*/ |
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inspect: function(){ |
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var tok |
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, tmp = this.str |
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, buf = []; |
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while ('eos' != (tok = this.next()).type) { |
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buf.push(tok.inspect()); |
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} |
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this.str = tmp; |
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return buf.concat(tok.inspect()).join('\n'); |
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}, |
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/** |
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* Lookahead `n` tokens. |
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* |
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* @param {Number} n |
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* @return {Object} |
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* @api private |
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*/ |
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lookahead: function(n){ |
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var fetch = n - this.stash.length; |
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while (fetch-- > 0) this.stash.push(this.advance()); |
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return this.stash[--n]; |
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}, |
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/** |
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* Consume the given `len`. |
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* |
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* @param {Number|Array} len |
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* @api private |
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*/ |
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skip: function(len){ |
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var chunk = len[0]; |
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len = chunk ? chunk.length : len; |
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this.str = this.str.substr(len); |
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if (chunk) { |
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this.move(chunk); |
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} else { |
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this.column += len; |
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} |
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}, |
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/** |
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* Move current line and column position. |
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* |
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* @param {String} str |
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* @api private |
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*/ |
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move: function(str){ |
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var lines = str.match(/\n/g) |
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, idx = str.lastIndexOf('\n'); |
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if (lines) this.lineno += lines.length; |
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this.column = ~idx |
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? str.length - idx |
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: this.column + str.length; |
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}, |
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/** |
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* Fetch next token including those stashed by peek. |
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* |
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* @return {Token} |
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* @api private |
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*/ |
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next: function() { |
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var tok = this.stashed() || this.advance(); |
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this.prev = tok; |
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return tok; |
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}, |
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/** |
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* Check if the current token is a part of selector. |
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* |
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* @return {Boolean} |
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* @api private |
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*/ |
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isPartOfSelector: function() { |
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var tok = this.stash[this.stash.length - 1] || this.prev; |
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switch (tok && tok.type) { |
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// #for |
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case 'color': |
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return 2 == tok.val.raw.length; |
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// .or |
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case '.': |
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// [is] |
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case '[': |
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return true; |
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} |
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return false; |
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}, |
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/** |
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* Fetch next token. |
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* |
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* @return {Token} |
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* @api private |
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*/ |
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advance: function() { |
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var column = this.column |
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, line = this.lineno |
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, tok = this.eos() |
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|| this.null() |
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|| this.sep() |
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|| this.keyword() |
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|| this.urlchars() |
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|| this.comment() |
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|| this.newline() |
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|| this.escaped() |
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|| this.important() |
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|| this.literal() |
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|| this.anonFunc() |
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|| this.atrule() |
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|| this.function() |
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|| this.brace() |
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|| this.paren() |
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|| this.color() |
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|| this.string() |
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|| this.unit() |
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|| this.namedop() |
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|| this.boolean() |
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|| this.unicode() |
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|| this.ident() |
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|| this.op() |
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|| this.eol() |
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|| this.space() |
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|| this.selector(); |
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tok.lineno = line; |
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tok.column = column; |
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return tok; |
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}, |
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/** |
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* Lookahead a single token. |
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* |
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* @return {Token} |
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* @api private |
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*/ |
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peek: function() { |
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return this.lookahead(1); |
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}, |
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/** |
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* Return the next possibly stashed token. |
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* |
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* @return {Token} |
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* @api private |
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*/ |
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stashed: function() { |
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return this.stash.shift(); |
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}, |
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/** |
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* EOS | trailing outdents. |
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*/ |
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eos: function() { |
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if (this.str.length) return; |
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if (this.indentStack.length) { |
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this.indentStack.shift(); |
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return new Token('outdent'); |
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} else { |
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return new Token('eos'); |
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} |
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}, |
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/** |
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* url char |
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*/ |
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urlchars: function() { |
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var captures; |
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if (!this.isURL) return; |
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if (captures = /^[\/:@.;?&=*!,<>#%0-9]+/.exec(this.str)) { |
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this.skip(captures); |
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return new Token('literal', new nodes.Literal(captures[0])); |
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} |
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}, |
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/** |
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* ';' [ \t]* |
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*/ |
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sep: function() { |
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var captures; |
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if (captures = /^;[ \t]*/.exec(this.str)) { |
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this.skip(captures); |
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return new Token(';'); |
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} |
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}, |
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/** |
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* '\r' |
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*/ |
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eol: function() { |
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if ('\r' == this.str[0]) { |
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++this.lineno; |
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this.skip(1); |
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return this.advance(); |
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} |
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}, |
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/** |
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* ' '+ |
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*/ |
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space: function() { |
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var captures; |
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if (captures = /^([ \t]+)/.exec(this.str)) { |
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this.skip(captures); |
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return new Token('space'); |
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} |
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}, |
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/** |
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* '\\' . ' '* |
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*/ |
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escaped: function() { |
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var captures; |
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if (captures = /^\\(.)[ \t]*/.exec(this.str)) { |
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var c = captures[1]; |
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this.skip(captures); |
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return new Token('ident', new nodes.Literal(c)); |
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} |
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}, |
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/** |
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* '@css' ' '* '{' .* '}' ' '* |
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*/ |
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literal: function() { |
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// HACK attack !!! |
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var captures; |
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if (captures = /^@css[ \t]*\{/.exec(this.str)) { |
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this.skip(captures); |
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var c |
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, braces = 1 |
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, css = '' |
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, node; |
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while (c = this.str[0]) { |
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this.str = this.str.substr(1); |
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switch (c) { |
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case '{': ++braces; break; |
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case '}': --braces; break; |
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case '\n': |
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case '\r': |
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++this.lineno; |
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break; |
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} |
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css += c; |
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if (!braces) break; |
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} |
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css = css.replace(/\s*}$/, ''); |
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node = new nodes.Literal(css); |
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node.css = true; |
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return new Token('literal', node); |
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} |
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}, |
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/** |
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* '!important' ' '* |
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*/ |
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important: function() { |
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var captures; |
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if (captures = /^!important[ \t]*/.exec(this.str)) { |
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this.skip(captures); |
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return new Token('ident', new nodes.Literal('!important')); |
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} |
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}, |
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/** |
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* '{' | '}' |
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*/ |
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brace: function() { |
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var captures; |
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if (captures = /^([{}])/.exec(this.str)) { |
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this.skip(1); |
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var brace = captures[1]; |
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return new Token(brace, brace); |
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} |
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}, |
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/** |
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* '(' | ')' ' '* |
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*/ |
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paren: function() { |
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var captures; |
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if (captures = /^([()])([ \t]*)/.exec(this.str)) { |
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var paren = captures[1]; |
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this.skip(captures); |
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if (')' == paren) this.isURL = false; |
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var tok = new Token(paren, paren); |
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tok.space = captures[2]; |
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return tok; |
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} |
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}, |
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/** |
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* 'null' |
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*/ |
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null: function() { |
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var captures |
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, tok; |
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if (captures = /^(null)\b[ \t]*/.exec(this.str)) { |
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this.skip(captures); |
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if (this.isPartOfSelector()) { |
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tok = new Token('ident', new nodes.Ident(captures[0])); |
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} else { |
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tok = new Token('null', nodes.null); |
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} |
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return tok; |
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} |
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}, |
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/** |
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* 'if' |
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* | 'else' |
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* | 'unless' |
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* | 'return' |
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* | 'for' |
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* | 'in' |
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*/ |
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keyword: function() { |
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var captures |
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, tok; |
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if (captures = /^(return|if|else|unless|for|in)\b[ \t]*/.exec(this.str)) { |
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var keyword = captures[1]; |
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this.skip(captures); |
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if (this.isPartOfSelector()) { |
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tok = new Token('ident', new nodes.Ident(captures[0])); |
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} else { |
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tok = new Token(keyword, keyword); |
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} |
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return tok; |
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} |
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}, |
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/** |
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* 'not' |
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* | 'and' |
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* | 'or' |
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* | 'is' |
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* | 'is not' |
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* | 'isnt' |
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* | 'is a' |
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* | 'is defined' |
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*/ |
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namedop: function() { |
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var captures |
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, tok; |
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if (captures = /^(not|and|or|is a|is defined|isnt|is not|is)(?!-)\b([ \t]*)/.exec(this.str)) { |
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var op = captures[1]; |
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this.skip(captures); |
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if (this.isPartOfSelector()) { |
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tok = new Token('ident', new nodes.Ident(captures[0])); |
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} else { |
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op = alias[op] || op; |
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tok = new Token(op, op); |
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} |
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tok.space = captures[2]; |
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return tok; |
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} |
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}, |
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/** |
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* ',' |
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* | '+' |
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* | '+=' |
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* | '-' |
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* | '-=' |
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* | '*' |
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* | '*=' |
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* | '/' |
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* | '/=' |
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* | '%' |
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* | '%=' |
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* | '**' |
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* | '!' |
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* | '&' |
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* | '&&' |
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* | '||' |
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* | '>' |
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* | '>=' |
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* | '<' |
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* | '<=' |
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* | '=' |
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* | '==' |
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* | '!=' |
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* | '!' |
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* | '~' |
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* | '?=' |
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* | ':=' |
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* | '?' |
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* | ':' |
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* | '[' |
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* | ']' |
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* | '.' |
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* | '..' |
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* | '...' |
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*/ |
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op: function() { |
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var captures; |
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if (captures = /^([.]{1,3}|&&|\|\||[!<>=?:]=|\*\*|[-+*\/%]=?|[,=?:!~<>&\[\]])([ \t]*)/.exec(this.str)) { |
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var op = captures[1]; |
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this.skip(captures); |
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op = alias[op] || op; |
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var tok = new Token(op, op); |
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tok.space = captures[2]; |
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this.isURL = false; |
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return tok; |
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} |
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}, |
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/** |
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* '@(' |
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*/ |
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anonFunc: function() { |
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var tok; |
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if ('@' == this.str[0] && '(' == this.str[1]) { |
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this.skip(2); |
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tok = new Token('function', new nodes.Ident('anonymous')); |
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tok.anonymous = true; |
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return tok; |
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} |
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}, |
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/** |
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* '@' (-(\w+)-)?[a-zA-Z0-9-_]+ |
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*/ |
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atrule: function() { |
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var captures; |
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if (captures = /^@(?:-(\w+)-)?([a-zA-Z0-9-_]+)[ \t]*/.exec(this.str)) { |
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this.skip(captures); |
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var vendor = captures[1] |
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, type = captures[2] |
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, tok; |
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switch (type) { |
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case 'require': |
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case 'import': |
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case 'charset': |
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case 'namespace': |
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case 'media': |
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case 'scope': |
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case 'supports': |
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return new Token(type); |
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case 'document': |
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return new Token('-moz-document'); |
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case 'block': |
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return new Token('atblock'); |
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case 'extend': |
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case 'extends': |
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return new Token('extend'); |
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case 'keyframes': |
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return new Token(type, vendor); |
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default: |
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return new Token('atrule', (vendor ? '-' + vendor + '-' + type : type)); |
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} |
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} |
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}, |
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/** |
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* '//' * |
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*/ |
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comment: function() { |
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// Single line |
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if ('/' == this.str[0] && '/' == this.str[1]) { |
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var end = this.str.indexOf('\n'); |
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if (-1 == end) end = this.str.length; |
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this.skip(end); |
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return this.advance(); |
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} |
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// Multi-line |
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if ('/' == this.str[0] && '*' == this.str[1]) { |
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var end = this.str.indexOf('*/'); |
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if (-1 == end) end = this.str.length; |
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var str = this.str.substr(0, end + 2) |
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, lines = str.split(/\n|\r/).length - 1 |
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, suppress = true |
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, inline = false; |
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this.lineno += lines; |
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this.skip(end + 2); |
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// output |
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if ('!' == str[2]) { |
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str = str.replace('*!', '*'); |
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suppress = false; |
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} |
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if (this.prev && ';' == this.prev.type) inline = true; |
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return new Token('comment', new nodes.Comment(str, suppress, inline)); |
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} |
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}, |
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/** |
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* 'true' | 'false' |
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*/ |
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boolean: function() { |
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var captures; |
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if (captures = /^(true|false)\b([ \t]*)/.exec(this.str)) { |
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var val = nodes.Boolean('true' == captures[1]); |
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this.skip(captures); |
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var tok = new Token('boolean', val); |
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tok.space = captures[2]; |
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return tok; |
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} |
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}, |
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/** |
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* 'U+' [0-9A-Fa-f?]{1,6}(?:-[0-9A-Fa-f]{1,6})? |
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*/ |
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unicode: function() { |
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var captures; |
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if (captures = /^u\+[0-9a-f?]{1,6}(?:-[0-9a-f]{1,6})?/i.exec(this.str)) { |
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this.skip(captures); |
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return new Token('literal', new nodes.Literal(captures[0])); |
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} |
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}, |
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/** |
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* -*[_a-zA-Z$] [-\w\d$]* '(' |
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*/ |
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|
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function: function() { |
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var captures; |
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if (captures = /^(-*[_a-zA-Z$][-\w\d$]*)\(([ \t]*)/.exec(this.str)) { |
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var name = captures[1]; |
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this.skip(captures); |
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this.isURL = 'url' == name; |
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var tok = new Token('function', new nodes.Ident(name)); |
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tok.space = captures[2]; |
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return tok; |
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} |
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}, |
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|
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/** |
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* -*[_a-zA-Z$] [-\w\d$]* |
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*/ |
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ident: function() { |
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var captures; |
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if (captures = /^-*[_a-zA-Z$][-\w\d$]*/.exec(this.str)) { |
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this.skip(captures); |
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return new Token('ident', new nodes.Ident(captures[0])); |
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} |
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}, |
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/** |
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* '\n' ' '+ |
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*/ |
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newline: function() { |
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var captures, re; |
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|
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// we have established the indentation regexp |
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if (this.indentRe){ |
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captures = this.indentRe.exec(this.str); |
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// figure out if we are using tabs or spaces |
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} else { |
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// try tabs |
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re = /^\n([\t]*)[ \t]*/; |
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captures = re.exec(this.str); |
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|
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// nope, try spaces |
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if (captures && !captures[1].length) { |
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re = /^\n([ \t]*)/; |
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captures = re.exec(this.str); |
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} |
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|
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// established |
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if (captures && captures[1].length) this.indentRe = re; |
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} |
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|
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|
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if (captures) { |
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var tok |
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, indents = captures[1].length; |
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|
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this.skip(captures); |
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if (this.str[0] === ' ' || this.str[0] === '\t') { |
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throw new errors.SyntaxError('Invalid indentation. You can use tabs or spaces to indent, but not both.'); |
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} |
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|
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// Blank line |
|
if ('\n' == this.str[0]) return this.advance(); |
|
|
|
// Outdent |
|
if (this.indentStack.length && indents < this.indentStack[0]) { |
|
while (this.indentStack.length && this.indentStack[0] > indents) { |
|
this.stash.push(new Token('outdent')); |
|
this.indentStack.shift(); |
|
} |
|
tok = this.stash.pop(); |
|
// Indent |
|
} else if (indents && indents != this.indentStack[0]) { |
|
this.indentStack.unshift(indents); |
|
tok = new Token('indent'); |
|
// Newline |
|
} else { |
|
tok = new Token('newline'); |
|
} |
|
|
|
return tok; |
|
} |
|
}, |
|
|
|
/** |
|
* '-'? (digit+ | digit* '.' digit+) unit |
|
*/ |
|
|
|
unit: function() { |
|
var captures; |
|
if (captures = /^(-)?(\d+\.\d+|\d+|\.\d+)(%|[a-zA-Z]+)?[ \t]*/.exec(this.str)) { |
|
this.skip(captures); |
|
var n = parseFloat(captures[2]); |
|
if ('-' == captures[1]) n = -n; |
|
var node = new nodes.Unit(n, captures[3]); |
|
node.raw = captures[0]; |
|
return new Token('unit', node); |
|
} |
|
}, |
|
|
|
/** |
|
* '"' [^"]+ '"' | "'"" [^']+ "'" |
|
*/ |
|
|
|
string: function() { |
|
var captures; |
|
if (captures = /^("[^"]*"|'[^']*')[ \t]*/.exec(this.str)) { |
|
var str = captures[1] |
|
, quote = captures[0][0]; |
|
this.skip(captures); |
|
str = str.slice(1,-1).replace(/\\n/g, '\n'); |
|
return new Token('string', new nodes.String(str, quote)); |
|
} |
|
}, |
|
|
|
/** |
|
* #rrggbbaa | #rrggbb | #rgba | #rgb | #nn | #n |
|
*/ |
|
|
|
color: function() { |
|
return this.rrggbbaa() |
|
|| this.rrggbb() |
|
|| this.rgba() |
|
|| this.rgb() |
|
|| this.nn() |
|
|| this.n() |
|
}, |
|
|
|
/** |
|
* #n |
|
*/ |
|
|
|
n: function() { |
|
var captures; |
|
if (captures = /^#([a-fA-F0-9]{1})[ \t]*/.exec(this.str)) { |
|
this.skip(captures); |
|
var n = parseInt(captures[1] + captures[1], 16) |
|
, color = new nodes.RGBA(n, n, n, 1); |
|
color.raw = captures[0]; |
|
return new Token('color', color); |
|
} |
|
}, |
|
|
|
/** |
|
* #nn |
|
*/ |
|
|
|
nn: function() { |
|
var captures; |
|
if (captures = /^#([a-fA-F0-9]{2})[ \t]*/.exec(this.str)) { |
|
this.skip(captures); |
|
var n = parseInt(captures[1], 16) |
|
, color = new nodes.RGBA(n, n, n, 1); |
|
color.raw = captures[0]; |
|
return new Token('color', color); |
|
} |
|
}, |
|
|
|
/** |
|
* #rgb |
|
*/ |
|
|
|
rgb: function() { |
|
var captures; |
|
if (captures = /^#([a-fA-F0-9]{3})[ \t]*/.exec(this.str)) { |
|
this.skip(captures); |
|
var rgb = captures[1] |
|
, r = parseInt(rgb[0] + rgb[0], 16) |
|
, g = parseInt(rgb[1] + rgb[1], 16) |
|
, b = parseInt(rgb[2] + rgb[2], 16) |
|
, color = new nodes.RGBA(r, g, b, 1); |
|
color.raw = captures[0]; |
|
return new Token('color', color); |
|
} |
|
}, |
|
|
|
/** |
|
* #rgba |
|
*/ |
|
|
|
rgba: function() { |
|
var captures; |
|
if (captures = /^#([a-fA-F0-9]{4})[ \t]*/.exec(this.str)) { |
|
this.skip(captures); |
|
var rgb = captures[1] |
|
, r = parseInt(rgb[0] + rgb[0], 16) |
|
, g = parseInt(rgb[1] + rgb[1], 16) |
|
, b = parseInt(rgb[2] + rgb[2], 16) |
|
, a = parseInt(rgb[3] + rgb[3], 16) |
|
, color = new nodes.RGBA(r, g, b, a/255); |
|
color.raw = captures[0]; |
|
return new Token('color', color); |
|
} |
|
}, |
|
|
|
/** |
|
* #rrggbb |
|
*/ |
|
|
|
rrggbb: function() { |
|
var captures; |
|
if (captures = /^#([a-fA-F0-9]{6})[ \t]*/.exec(this.str)) { |
|
this.skip(captures); |
|
var rgb = captures[1] |
|
, r = parseInt(rgb.substr(0, 2), 16) |
|
, g = parseInt(rgb.substr(2, 2), 16) |
|
, b = parseInt(rgb.substr(4, 2), 16) |
|
, color = new nodes.RGBA(r, g, b, 1); |
|
color.raw = captures[0]; |
|
return new Token('color', color); |
|
} |
|
}, |
|
|
|
/** |
|
* #rrggbbaa |
|
*/ |
|
|
|
rrggbbaa: function() { |
|
var captures; |
|
if (captures = /^#([a-fA-F0-9]{8})[ \t]*/.exec(this.str)) { |
|
this.skip(captures); |
|
var rgb = captures[1] |
|
, r = parseInt(rgb.substr(0, 2), 16) |
|
, g = parseInt(rgb.substr(2, 2), 16) |
|
, b = parseInt(rgb.substr(4, 2), 16) |
|
, a = parseInt(rgb.substr(6, 2), 16) |
|
, color = new nodes.RGBA(r, g, b, a/255); |
|
color.raw = captures[0]; |
|
return new Token('color', color); |
|
} |
|
}, |
|
|
|
/** |
|
* ^|[^\n,;]+ |
|
*/ |
|
|
|
selector: function() { |
|
var captures; |
|
if (captures = /^\^|.*?(?=\/\/(?![^\[]*\])|[,\n{])/.exec(this.str)) { |
|
var selector = captures[0]; |
|
this.skip(captures); |
|
return new Token('selector', selector); |
|
} |
|
} |
|
};
|
|
|