882 lines
18 KiB
JavaScript
882 lines
18 KiB
JavaScript
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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})?
|
|
*/
|
|
|
|
unicode: function() {
|
|
var captures;
|
|
if (captures = /^u\+[0-9a-f?]{1,6}(?:-[0-9a-f]{1,6})?/i.exec(this.str)) {
|
|
this.skip(captures);
|
|
return new Token('literal', new nodes.Literal(captures[0]));
|
|
}
|
|
},
|
|
|
|
/**
|
|
* -*[_a-zA-Z$] [-\w\d$]* '('
|
|
*/
|
|
|
|
function: function() {
|
|
var captures;
|
|
if (captures = /^(-*[_a-zA-Z$][-\w\d$]*)\(([ \t]*)/.exec(this.str)) {
|
|
var name = captures[1];
|
|
this.skip(captures);
|
|
this.isURL = 'url' == name;
|
|
var tok = new Token('function', new nodes.Ident(name));
|
|
tok.space = captures[2];
|
|
return tok;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* -*[_a-zA-Z$] [-\w\d$]*
|
|
*/
|
|
|
|
ident: function() {
|
|
var captures;
|
|
if (captures = /^-*[_a-zA-Z$][-\w\d$]*/.exec(this.str)) {
|
|
this.skip(captures);
|
|
return new Token('ident', new nodes.Ident(captures[0]));
|
|
}
|
|
},
|
|
|
|
/**
|
|
* '\n' ' '+
|
|
*/
|
|
|
|
newline: function() {
|
|
var captures, re;
|
|
|
|
// we have established the indentation regexp
|
|
if (this.indentRe){
|
|
captures = this.indentRe.exec(this.str);
|
|
// figure out if we are using tabs or spaces
|
|
} else {
|
|
// try tabs
|
|
re = /^\n([\t]*)[ \t]*/;
|
|
captures = re.exec(this.str);
|
|
|
|
// nope, try spaces
|
|
if (captures && !captures[1].length) {
|
|
re = /^\n([ \t]*)/;
|
|
captures = re.exec(this.str);
|
|
}
|
|
|
|
// established
|
|
if (captures && captures[1].length) this.indentRe = re;
|
|
}
|
|
|
|
|
|
if (captures) {
|
|
var tok
|
|
, indents = captures[1].length;
|
|
|
|
this.skip(captures);
|
|
if (this.str[0] === ' ' || this.str[0] === '\t') {
|
|
throw new errors.SyntaxError('Invalid indentation. You can use tabs or spaces to indent, but not both.');
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
}
|
|
};
|