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847 lines
19 KiB
JavaScript
847 lines
19 KiB
JavaScript
'use strict';
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var Lexer = require('./lexer');
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var nodes = require('./nodes');
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var utils = require('./utils');
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var filters = require('./filters');
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var path = require('path');
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var constantinople = require('constantinople');
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var parseJSExpression = require('character-parser').parseMax;
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var extname = path.extname;
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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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//Strip any UTF-8 BOM off of the start of `str`, if it exists.
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this.input = str.replace(/^\uFEFF/, '');
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this.lexer = new Lexer(this.input, filename);
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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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this.inMixin = 0;
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this.dependencies = [];
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this.inBlock = 0;
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};
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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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* Save original constructor
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*/
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constructor: Parser,
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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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* 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 = 0;
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block.filename = this.filename;
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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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var next = this.peek();
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var expr = this.parseExpr();
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expr.filename = expr.filename || this.filename;
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expr.line = next.line;
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block.push(expr);
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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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if (!this.extending && !this.included && Object.keys(this.blocks).length){
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var blocks = [];
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utils.walkAST(block, function (node) {
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if (node.type === 'Block' && node.name) {
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blocks.push(node.name);
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}
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});
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Object.keys(this.blocks).forEach(function (name) {
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if (blocks.indexOf(name) === -1 && !this.blocks[name].isSubBlock) {
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console.warn('Warning: Unexpected block "'
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+ name
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+ '" '
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+ ' on line '
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+ this.blocks[name].line
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+ ' of '
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+ (this.blocks[name].filename)
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+ '. This block is never used. This warning will be an error in v2.0.0');
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}
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}.bind(this));
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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 'mixin-block':
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return this.parseMixinBlock();
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case 'case':
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return this.parseCase();
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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 'blockCode':
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return this.parseBlockCode();
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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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var tokens = this.parseInlineTagsInText(tok.val);
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if (tokens.length === 1) return tokens[0];
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var node = new nodes.Block;
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for (var i = 0; i < tokens.length; i++) {
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node.push(tokens[i]);
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};
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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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var node = new nodes.Case(val);
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node.line = this.line();
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var block = new nodes.Block;
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block.line = this.line();
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block.filename = this.filename;
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this.expect('indent');
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while ('outdent' != this.peek().type) {
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switch (this.peek().type) {
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case 'comment':
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case 'newline':
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this.advance();
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break;
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case 'when':
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block.push(this.parseWhen());
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break;
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case 'default':
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block.push(this.parseDefault());
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break;
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default:
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throw new Error('Unexpected token "' + this.peek().type
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+ '", expected "when", "default" or "newline"');
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}
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}
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this.expect('outdent');
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node.block = 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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if (this.peek().type !== 'newline')
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return new nodes.Case.When(val, this.parseBlockExpansion());
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else
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return new nodes.Case.When(val);
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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(afterIf){
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var tok = this.expect('code');
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var node = new nodes.Code(tok.val, tok.buffer, tok.escape);
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var block;
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node.line = this.line();
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// throw an error if an else does not have an if
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if (tok.isElse && !tok.hasIf) {
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throw new Error('Unexpected else without if');
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}
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// handle block
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block = 'indent' == this.peek().type;
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if (block) {
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node.block = this.block();
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}
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// handle missing block
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if (tok.requiresBlock && !block) {
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node.block = new nodes.Block();
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}
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// mark presense of if for future elses
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if (tok.isIf && this.peek().isElse) {
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this.peek().hasIf = true;
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} else if (tok.isIf && this.peek().type === 'newline' && this.lookahead(2).isElse) {
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this.lookahead(2).hasIf = true;
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}
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return node;
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},
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/**
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* block code
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*/
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parseBlockCode: function(){
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var tok = this.expect('blockCode');
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var node;
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var body = this.peek();
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var text;
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if (body.type === 'pipeless-text') {
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this.advance();
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text = body.val.join('\n');
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} else {
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text = '';
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}
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node = new nodes.Code(text, false, false);
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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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var node;
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var block;
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if (block = this.parseTextBlock()) {
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node = new nodes.BlockComment(tok.val, 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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var 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 tok = this.expect('filter');
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var attrs = this.accept('attrs');
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var block;
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block = this.parseTextBlock() || new nodes.Block();
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var options = {};
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if (attrs) {
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attrs.attrs.forEach(function (attribute) {
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options[attribute.name] = constantinople.toConstant(attribute.val);
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});
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}
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var node = new nodes.Filter(tok.val, block, options);
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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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var 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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if (this.peek().type == 'code' && this.peek().val == 'else') {
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this.advance();
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node.alternative = this.block();
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}
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return node;
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},
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/**
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* Resolves a path relative to the template for use in
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* includes and extends
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*
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* @param {String} path
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* @param {String} purpose Used in error messages.
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* @return {String}
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* @api private
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*/
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resolvePath: function (path, purpose) {
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var p = require('path');
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var dirname = p.dirname;
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var basename = p.basename;
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var join = p.join;
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if (path[0] !== '/' && !this.filename)
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throw new Error('the "filename" option is required to use "' + purpose + '" with "relative" paths');
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if (path[0] === '/' && !this.options.basedir)
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throw new Error('the "basedir" option is required to use "' + purpose + '" with "absolute" paths');
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path = join(path[0] === '/' ? this.options.basedir : dirname(this.filename), path);
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if (basename(path).indexOf('.') === -1) path += '.jade';
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return path;
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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 fs = require('fs');
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var path = this.resolvePath(this.expect('extends').val.trim(), 'extends');
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if ('.jade' != path.substr(-5)) path += '.jade';
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this.dependencies.push(path);
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var str = fs.readFileSync(path, 'utf8');
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var parser = new this.constructor(str, path, this.options);
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parser.dependencies = this.dependencies;
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parser.blocks = this.blocks;
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parser.included = this.included;
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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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var mode = block.mode;
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var name = block.val.trim();
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var line = block.line;
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this.inBlock++;
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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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this.inBlock--;
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block.name = name;
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block.line = line;
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var prev = this.blocks[name] || {prepended: [], appended: []}
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if (prev.mode === 'replace') return this.blocks[name] = prev;
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var allNodes = prev.prepended.concat(block.nodes).concat(prev.appended);
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switch (mode) {
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case 'append':
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prev.appended = prev.parser === this ?
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prev.appended.concat(block.nodes) :
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block.nodes.concat(prev.appended);
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break;
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case 'prepend':
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prev.prepended = prev.parser === this ?
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block.nodes.concat(prev.prepended) :
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prev.prepended.concat(block.nodes);
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break;
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}
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block.nodes = allNodes;
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block.appended = prev.appended;
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block.prepended = prev.prepended;
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block.mode = mode;
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block.parser = this;
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block.isSubBlock = this.inBlock > 0;
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return this.blocks[name] = block;
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},
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parseMixinBlock: function () {
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var block = this.expect('mixin-block');
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if (!this.inMixin) {
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throw new Error('Anonymous blocks are not allowed unless they are part of a mixin.');
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}
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return new nodes.MixinBlock();
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},
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/**
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* include block?
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*/
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parseInclude: function(){
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var fs = require('fs');
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var tok = this.expect('include');
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var path = this.resolvePath(tok.val.trim(), 'include');
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this.dependencies.push(path);
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// has-filter
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if (tok.filter) {
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var str = fs.readFileSync(path, 'utf8').replace(/\r/g, '');
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var options = {filename: path};
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if (tok.attrs) {
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tok.attrs.attrs.forEach(function (attribute) {
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options[attribute.name] = constantinople.toConstant(attribute.val);
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});
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}
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str = filters(tok.filter, str, options);
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return new nodes.Literal(str);
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}
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// non-jade
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if ('.jade' != path.substr(-5)) {
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var str = fs.readFileSync(path, 'utf8').replace(/\r/g, '');
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return new nodes.Literal(str);
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}
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var str = fs.readFileSync(path, 'utf8');
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var parser = new this.constructor(str, path, this.options);
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parser.dependencies = this.dependencies;
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parser.blocks = utils.merge({}, this.blocks);
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parser.included = true;
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parser.mixins = this.mixins;
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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');
|
|
var name = tok.val;
|
|
var args = tok.args;
|
|
var mixin = new nodes.Mixin(name, args, new nodes.Block, true);
|
|
|
|
this.tag(mixin);
|
|
if (mixin.code) {
|
|
mixin.block.push(mixin.code);
|
|
mixin.code = null;
|
|
}
|
|
if (mixin.block.isEmpty()) mixin.block = null;
|
|
return mixin;
|
|
},
|
|
|
|
/**
|
|
* mixin block
|
|
*/
|
|
|
|
parseMixin: function(){
|
|
var tok = this.expect('mixin');
|
|
var name = tok.val;
|
|
var args = tok.args;
|
|
var mixin;
|
|
|
|
// definition
|
|
if ('indent' == this.peek().type) {
|
|
this.inMixin++;
|
|
mixin = new nodes.Mixin(name, args, this.block(), false);
|
|
this.mixins[name] = mixin;
|
|
this.inMixin--;
|
|
return mixin;
|
|
// call
|
|
} else {
|
|
return new nodes.Mixin(name, args, null, true);
|
|
}
|
|
},
|
|
|
|
parseInlineTagsInText: function (str) {
|
|
var line = this.line();
|
|
|
|
var match = /(\\)?#\[((?:.|\n)*)$/.exec(str);
|
|
if (match) {
|
|
if (match[1]) { // escape
|
|
var text = new nodes.Text(str.substr(0, match.index) + '#[');
|
|
text.line = line;
|
|
var rest = this.parseInlineTagsInText(match[2]);
|
|
if (rest[0].type === 'Text') {
|
|
text.val += rest[0].val;
|
|
rest.shift();
|
|
}
|
|
return [text].concat(rest);
|
|
} else {
|
|
var text = new nodes.Text(str.substr(0, match.index));
|
|
text.line = line;
|
|
var buffer = [text];
|
|
var rest = match[2];
|
|
var range = parseJSExpression(rest);
|
|
var inner = new Parser(range.src, this.filename, this.options);
|
|
buffer.push(inner.parse());
|
|
return buffer.concat(this.parseInlineTagsInText(rest.substr(range.end + 1)));
|
|
}
|
|
} else {
|
|
var text = new nodes.Text(str);
|
|
text.line = line;
|
|
return [text];
|
|
}
|
|
},
|
|
|
|
/**
|
|
* indent (text | newline)* outdent
|
|
*/
|
|
|
|
parseTextBlock: function(){
|
|
var block = new nodes.Block;
|
|
block.line = this.line();
|
|
var body = this.peek();
|
|
if (body.type !== 'pipeless-text') return;
|
|
this.advance();
|
|
block.nodes = body.val.reduce(function (accumulator, text) {
|
|
return accumulator.concat(this.parseInlineTagsInText(text));
|
|
}.bind(this), []);
|
|
return block;
|
|
},
|
|
|
|
/**
|
|
* indent expr* outdent
|
|
*/
|
|
|
|
block: function(){
|
|
var block = new nodes.Block;
|
|
block.line = this.line();
|
|
block.filename = this.filename;
|
|
this.expect('indent');
|
|
while ('outdent' != this.peek().type) {
|
|
if ('newline' == this.peek().type) {
|
|
this.advance();
|
|
} else {
|
|
var expr = this.parseExpr();
|
|
expr.filename = this.filename;
|
|
block.push(expr);
|
|
}
|
|
}
|
|
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(){
|
|
var tok = this.advance();
|
|
var tag = new nodes.Tag(tok.val);
|
|
|
|
tag.selfClosing = tok.selfClosing;
|
|
|
|
return this.tag(tag);
|
|
},
|
|
|
|
/**
|
|
* Parse tag.
|
|
*/
|
|
|
|
tag: function(tag){
|
|
tag.line = this.line();
|
|
|
|
var seenAttrs = false;
|
|
// (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':
|
|
if (seenAttrs) {
|
|
console.warn(this.filename + ', line ' + this.peek().line + ':\nYou should not have jade tags with multiple attributes.');
|
|
}
|
|
seenAttrs = true;
|
|
var tok = this.advance();
|
|
var attrs = tok.attrs;
|
|
|
|
if (tok.selfClosing) tag.selfClosing = true;
|
|
|
|
for (var i = 0; i < attrs.length; i++) {
|
|
tag.setAttribute(attrs[i].name, attrs[i].val, attrs[i].escaped);
|
|
}
|
|
continue;
|
|
case '&attributes':
|
|
var tok = this.advance();
|
|
tag.addAttributes(tok.val);
|
|
break;
|
|
default:
|
|
break out;
|
|
}
|
|
}
|
|
|
|
// check immediate '.'
|
|
if ('dot' == this.peek().type) {
|
|
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;
|
|
case 'newline':
|
|
case 'indent':
|
|
case 'outdent':
|
|
case 'eos':
|
|
case 'pipeless-text':
|
|
break;
|
|
default:
|
|
throw new Error('Unexpected token `' + this.peek().type + '` expected `text`, `code`, `:`, `newline` or `eos`')
|
|
}
|
|
|
|
// newline*
|
|
while ('newline' == this.peek().type) this.advance();
|
|
|
|
// block?
|
|
if (tag.textOnly) {
|
|
tag.block = this.parseTextBlock() || new nodes.Block();
|
|
} else if ('indent' == this.peek().type) {
|
|
var block = this.block();
|
|
for (var i = 0, len = block.nodes.length; i < len; ++i) {
|
|
tag.block.push(block.nodes[i]);
|
|
}
|
|
}
|
|
|
|
return tag;
|
|
}
|
|
};
|