711 lines
14 KiB
JavaScript
711 lines
14 KiB
JavaScript
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/*!
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* Jade - Parser
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* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
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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 Lexer = require('./lexer')
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, nodes = require('./nodes');
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/**
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* Initialize `Parser` with the given input `str` and `filename`.
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*
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* @param {String} str
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* @param {String} filename
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* @param {Object} options
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* @api public
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*/
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var Parser = exports = module.exports = function Parser(str, filename, options){
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this.input = str;
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this.lexer = new Lexer(str, options);
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this.filename = filename;
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this.blocks = {};
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this.mixins = {};
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this.options = options;
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this.contexts = [this];
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};
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/**
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* Tags that may not contain tags.
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*/
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var textOnly = exports.textOnly = ['script', 'style'];
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/**
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* Parser prototype.
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*/
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Parser.prototype = {
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/**
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* Push `parser` onto the context stack,
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* or pop and return a `Parser`.
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*/
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context: function(parser){
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if (parser) {
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this.contexts.push(parser);
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} else {
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return this.contexts.pop();
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}
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},
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/**
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* Return the next token object.
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*
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* @return {Object}
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* @api private
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*/
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advance: function(){
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return this.lexer.advance();
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},
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/**
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* Skip `n` tokens.
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*
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* @param {Number} n
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* @api private
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*/
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skip: function(n){
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while (n--) this.advance();
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},
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/**
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* Single token lookahead.
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*
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* @return {Object}
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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 lexer lineno.
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*
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* @return {Number}
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* @api private
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*/
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line: function() {
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return this.lexer.lineno;
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},
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/**
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* `n` token lookahead.
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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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return this.lexer.lookahead(n);
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},
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/**
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* Parse input returning a string of js for evaluation.
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*
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* @return {String}
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* @api public
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*/
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parse: function(){
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var block = new nodes.Block, parser;
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block.line = this.line();
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while ('eos' != this.peek().type) {
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if ('newline' == this.peek().type) {
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this.advance();
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} else {
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block.push(this.parseExpr());
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}
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}
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if (parser = this.extending) {
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this.context(parser);
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var ast = parser.parse();
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this.context();
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// hoist mixins
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for (var name in this.mixins)
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ast.unshift(this.mixins[name]);
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return ast;
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}
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return block;
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},
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/**
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* Expect the given type, or throw an exception.
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*
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* @param {String} type
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* @api private
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*/
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expect: function(type){
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if (this.peek().type === type) {
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return this.advance();
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} else {
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throw new Error('expected "' + type + '", but got "' + this.peek().type + '"');
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}
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},
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/**
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* Accept the given `type`.
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*
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* @param {String} type
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* @api private
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*/
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accept: function(type){
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if (this.peek().type === type) {
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return this.advance();
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}
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},
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/**
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* tag
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* | doctype
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* | mixin
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* | include
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* | filter
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* | comment
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* | text
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* | each
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* | code
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* | yield
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* | id
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* | class
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* | interpolation
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*/
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parseExpr: function(){
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switch (this.peek().type) {
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case 'tag':
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return this.parseTag();
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case 'mixin':
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return this.parseMixin();
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case 'block':
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return this.parseBlock();
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case 'case':
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return this.parseCase();
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case 'when':
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return this.parseWhen();
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case 'default':
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return this.parseDefault();
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case 'extends':
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return this.parseExtends();
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case 'include':
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return this.parseInclude();
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case 'doctype':
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return this.parseDoctype();
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case 'filter':
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return this.parseFilter();
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case 'comment':
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return this.parseComment();
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case 'text':
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return this.parseText();
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case 'each':
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return this.parseEach();
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case 'code':
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return this.parseCode();
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case 'call':
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return this.parseCall();
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case 'interpolation':
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return this.parseInterpolation();
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case 'yield':
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this.advance();
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var block = new nodes.Block;
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block.yield = true;
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return block;
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case 'id':
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case 'class':
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var tok = this.advance();
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this.lexer.defer(this.lexer.tok('tag', 'div'));
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this.lexer.defer(tok);
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return this.parseExpr();
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default:
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throw new Error('unexpected token "' + this.peek().type + '"');
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}
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},
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/**
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* Text
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*/
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parseText: function(){
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var tok = this.expect('text')
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, node = new nodes.Text(tok.val);
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node.line = this.line();
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return node;
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},
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/**
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* ':' expr
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* | block
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*/
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parseBlockExpansion: function(){
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if (':' == this.peek().type) {
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this.advance();
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return new nodes.Block(this.parseExpr());
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} else {
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return this.block();
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}
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},
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/**
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* case
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*/
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parseCase: function(){
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var val = this.expect('case').val
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, node = new nodes.Case(val);
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node.line = this.line();
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node.block = this.block();
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return node;
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},
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/**
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* when
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*/
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parseWhen: function(){
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var val = this.expect('when').val
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return new nodes.Case.When(val, this.parseBlockExpansion());
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},
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/**
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* default
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*/
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parseDefault: function(){
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this.expect('default');
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return new nodes.Case.When('default', this.parseBlockExpansion());
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},
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/**
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* code
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*/
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parseCode: function(){
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var tok = this.expect('code')
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, node = new nodes.Code(tok.val, tok.buffer, tok.escape)
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, block
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, i = 1;
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node.line = this.line();
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while (this.lookahead(i) && 'newline' == this.lookahead(i).type) ++i;
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block = 'indent' == this.lookahead(i).type;
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if (block) {
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this.skip(i-1);
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node.block = this.block();
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}
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return node;
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},
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/**
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* comment
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*/
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parseComment: function(){
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var tok = this.expect('comment')
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, node;
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if ('indent' == this.peek().type) {
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node = new nodes.BlockComment(tok.val, this.block(), tok.buffer);
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} else {
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node = new nodes.Comment(tok.val, tok.buffer);
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}
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node.line = this.line();
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return node;
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},
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/**
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* doctype
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*/
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parseDoctype: function(){
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var tok = this.expect('doctype')
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, node = new nodes.Doctype(tok.val);
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node.line = this.line();
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return node;
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},
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/**
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* filter attrs? text-block
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*/
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parseFilter: function(){
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var block
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, tok = this.expect('filter')
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, attrs = this.accept('attrs');
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this.lexer.pipeless = true;
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block = this.parseTextBlock();
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this.lexer.pipeless = false;
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var node = new nodes.Filter(tok.val, block, attrs && attrs.attrs);
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node.line = this.line();
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return node;
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},
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/**
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* tag ':' attrs? block
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*/
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parseASTFilter: function(){
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var block
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, tok = this.expect('tag')
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, attrs = this.accept('attrs');
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this.expect(':');
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block = this.block();
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var node = new nodes.Filter(tok.val, block, attrs && attrs.attrs);
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node.line = this.line();
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return node;
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},
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/**
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* each block
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*/
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parseEach: function(){
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var tok = this.expect('each')
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, node = new nodes.Each(tok.code, tok.val, tok.key);
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node.line = this.line();
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node.block = this.block();
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return node;
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},
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/**
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* 'extends' name
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*/
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parseExtends: function(){
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var path = require('path')
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, fs = require('fs')
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, dirname = path.dirname
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, basename = path.basename
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, join = path.join;
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if (!this.filename)
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throw new Error('the "filename" option is required to extend templates');
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var path = this.expect('extends').val.trim()
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, dir = dirname(this.filename);
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var path = join(dir, path + '.jade')
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, str = fs.readFileSync(path, 'utf8')
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, parser = new Parser(str, path, this.options);
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parser.blocks = this.blocks;
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parser.contexts = this.contexts;
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this.extending = parser;
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// TODO: null node
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return new nodes.Literal('');
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},
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/**
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* 'block' name block
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*/
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parseBlock: function(){
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var block = this.expect('block')
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, mode = block.mode
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, name = block.val.trim();
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block = 'indent' == this.peek().type
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? this.block()
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: new nodes.Block(new nodes.Literal(''));
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var prev = this.blocks[name];
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if (prev) {
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switch (prev.mode) {
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case 'append':
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block.nodes = block.nodes.concat(prev.nodes);
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prev = block;
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break;
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case 'prepend':
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block.nodes = prev.nodes.concat(block.nodes);
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prev = block;
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break;
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}
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|
}
|
||
|
|
|
||
|
|
block.mode = mode;
|
||
|
|
return this.blocks[name] = prev || block;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* include block?
|
||
|
|
*/
|
||
|
|
|
||
|
|
parseInclude: function(){
|
||
|
|
var path = require('path')
|
||
|
|
, fs = require('fs')
|
||
|
|
, dirname = path.dirname
|
||
|
|
, basename = path.basename
|
||
|
|
, join = path.join;
|
||
|
|
|
||
|
|
var path = this.expect('include').val.trim()
|
||
|
|
, dir = dirname(this.filename);
|
||
|
|
|
||
|
|
if (!this.filename)
|
||
|
|
throw new Error('the "filename" option is required to use includes');
|
||
|
|
|
||
|
|
// no extension
|
||
|
|
if (!~basename(path).indexOf('.')) {
|
||
|
|
path += '.jade';
|
||
|
|
}
|
||
|
|
|
||
|
|
// non-jade
|
||
|
|
if ('.jade' != path.substr(-5)) {
|
||
|
|
var path = join(dir, path)
|
||
|
|
, str = fs.readFileSync(path, 'utf8');
|
||
|
|
return new nodes.Literal(str);
|
||
|
|
}
|
||
|
|
|
||
|
|
var path = join(dir, path)
|
||
|
|
, str = fs.readFileSync(path, 'utf8')
|
||
|
|
, parser = new Parser(str, path, this.options);
|
||
|
|
parser.blocks = this.blocks;
|
||
|
|
parser.mixins = this.mixins;
|
||
|
|
|
||
|
|
this.context(parser);
|
||
|
|
var ast = parser.parse();
|
||
|
|
this.context();
|
||
|
|
ast.filename = path;
|
||
|
|
|
||
|
|
if ('indent' == this.peek().type) {
|
||
|
|
ast.includeBlock().push(this.block());
|
||
|
|
}
|
||
|
|
|
||
|
|
return ast;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* call ident block
|
||
|
|
*/
|
||
|
|
|
||
|
|
parseCall: function(){
|
||
|
|
var tok = this.expect('call')
|
||
|
|
, name = tok.val
|
||
|
|
, args = tok.args
|
||
|
|
, mixin = new nodes.Mixin(name, args, new nodes.Block, true);
|
||
|
|
|
||
|
|
this.tag(mixin);
|
||
|
|
if (mixin.block.isEmpty()) mixin.block = null;
|
||
|
|
return mixin;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* mixin block
|
||
|
|
*/
|
||
|
|
|
||
|
|
parseMixin: function(){
|
||
|
|
var tok = this.expect('mixin')
|
||
|
|
, name = tok.val
|
||
|
|
, args = tok.args
|
||
|
|
, mixin;
|
||
|
|
|
||
|
|
// definition
|
||
|
|
if ('indent' == this.peek().type) {
|
||
|
|
mixin = new nodes.Mixin(name, args, this.block(), false);
|
||
|
|
this.mixins[name] = mixin;
|
||
|
|
return mixin;
|
||
|
|
// call
|
||
|
|
} else {
|
||
|
|
return new nodes.Mixin(name, args, null, true);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* indent (text | newline)* outdent
|
||
|
|
*/
|
||
|
|
|
||
|
|
parseTextBlock: function(){
|
||
|
|
var block = new nodes.Block;
|
||
|
|
block.line = this.line();
|
||
|
|
var spaces = this.expect('indent').val;
|
||
|
|
if (null == this._spaces) this._spaces = spaces;
|
||
|
|
var indent = Array(spaces - this._spaces + 1).join(' ');
|
||
|
|
while ('outdent' != this.peek().type) {
|
||
|
|
switch (this.peek().type) {
|
||
|
|
case 'newline':
|
||
|
|
this.advance();
|
||
|
|
break;
|
||
|
|
case 'indent':
|
||
|
|
this.parseTextBlock().nodes.forEach(function(node){
|
||
|
|
block.push(node);
|
||
|
|
});
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
var text = new nodes.Text(indent + this.advance().val);
|
||
|
|
text.line = this.line();
|
||
|
|
block.push(text);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (spaces == this._spaces) this._spaces = null;
|
||
|
|
this.expect('outdent');
|
||
|
|
return block;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* indent expr* outdent
|
||
|
|
*/
|
||
|
|
|
||
|
|
block: function(){
|
||
|
|
var block = new nodes.Block;
|
||
|
|
block.line = this.line();
|
||
|
|
this.expect('indent');
|
||
|
|
while ('outdent' != this.peek().type) {
|
||
|
|
if ('newline' == this.peek().type) {
|
||
|
|
this.advance();
|
||
|
|
} else {
|
||
|
|
block.push(this.parseExpr());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
this.expect('outdent');
|
||
|
|
return block;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* interpolation (attrs | class | id)* (text | code | ':')? newline* block?
|
||
|
|
*/
|
||
|
|
|
||
|
|
parseInterpolation: function(){
|
||
|
|
var tok = this.advance();
|
||
|
|
var tag = new nodes.Tag(tok.val);
|
||
|
|
tag.buffer = true;
|
||
|
|
return this.tag(tag);
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tag (attrs | class | id)* (text | code | ':')? newline* block?
|
||
|
|
*/
|
||
|
|
|
||
|
|
parseTag: function(){
|
||
|
|
// ast-filter look-ahead
|
||
|
|
var i = 2;
|
||
|
|
if ('attrs' == this.lookahead(i).type) ++i;
|
||
|
|
if (':' == this.lookahead(i).type) {
|
||
|
|
if ('indent' == this.lookahead(++i).type) {
|
||
|
|
return this.parseASTFilter();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var tok = this.advance()
|
||
|
|
, tag = new nodes.Tag(tok.val);
|
||
|
|
|
||
|
|
tag.selfClosing = tok.selfClosing;
|
||
|
|
|
||
|
|
return this.tag(tag);
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Parse tag.
|
||
|
|
*/
|
||
|
|
|
||
|
|
tag: function(tag){
|
||
|
|
var dot;
|
||
|
|
|
||
|
|
tag.line = this.line();
|
||
|
|
|
||
|
|
// (attrs | class | id)*
|
||
|
|
out:
|
||
|
|
while (true) {
|
||
|
|
switch (this.peek().type) {
|
||
|
|
case 'id':
|
||
|
|
case 'class':
|
||
|
|
var tok = this.advance();
|
||
|
|
tag.setAttribute(tok.type, "'" + tok.val + "'");
|
||
|
|
continue;
|
||
|
|
case 'attrs':
|
||
|
|
var tok = this.advance()
|
||
|
|
, obj = tok.attrs
|
||
|
|
, escaped = tok.escaped
|
||
|
|
, names = Object.keys(obj);
|
||
|
|
|
||
|
|
if (tok.selfClosing) tag.selfClosing = true;
|
||
|
|
|
||
|
|
for (var i = 0, len = names.length; i < len; ++i) {
|
||
|
|
var name = names[i]
|
||
|
|
, val = obj[name];
|
||
|
|
tag.setAttribute(name, val, escaped[name]);
|
||
|
|
}
|
||
|
|
continue;
|
||
|
|
default:
|
||
|
|
break out;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// check immediate '.'
|
||
|
|
if ('.' == this.peek().val) {
|
||
|
|
dot = tag.textOnly = true;
|
||
|
|
this.advance();
|
||
|
|
}
|
||
|
|
|
||
|
|
// (text | code | ':')?
|
||
|
|
switch (this.peek().type) {
|
||
|
|
case 'text':
|
||
|
|
tag.block.push(this.parseText());
|
||
|
|
break;
|
||
|
|
case 'code':
|
||
|
|
tag.code = this.parseCode();
|
||
|
|
break;
|
||
|
|
case ':':
|
||
|
|
this.advance();
|
||
|
|
tag.block = new nodes.Block;
|
||
|
|
tag.block.push(this.parseExpr());
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// newline*
|
||
|
|
while ('newline' == this.peek().type) this.advance();
|
||
|
|
|
||
|
|
tag.textOnly = tag.textOnly || ~textOnly.indexOf(tag.name);
|
||
|
|
|
||
|
|
// script special-case
|
||
|
|
if ('script' == tag.name) {
|
||
|
|
var type = tag.getAttribute('type');
|
||
|
|
if (!dot && type && 'text/javascript' != type.replace(/^['"]|['"]$/g, '')) {
|
||
|
|
tag.textOnly = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// block?
|
||
|
|
if ('indent' == this.peek().type) {
|
||
|
|
if (tag.textOnly) {
|
||
|
|
this.lexer.pipeless = true;
|
||
|
|
tag.block = this.parseTextBlock();
|
||
|
|
this.lexer.pipeless = false;
|
||
|
|
} else {
|
||
|
|
var block = this.block();
|
||
|
|
if (tag.block) {
|
||
|
|
for (var i = 0, len = block.nodes.length; i < len; ++i) {
|
||
|
|
tag.block.push(block.nodes[i]);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
tag.block = block;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return tag;
|
||
|
|
}
|
||
|
|
};
|