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jade.js
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jade.js
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(function(e){if("function"==typeof bootstrap)bootstrap("jade",e);else if("object"==typeof exports)module.exports=e();else if("function"==typeof define&&define.amd)define(e);else if("undefined"!=typeof ses){if(!ses.ok())return;ses.makeJade=e}else"undefined"!=typeof window?window.jade=e():global.jade=e()})(function(){var define,ses,bootstrap,module,exports;
return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/*!
* Jade - Compiler
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var nodes = require('./nodes')
, filters = require('./filters')
, doctypes = require('./doctypes')
, selfClosing = require('./self-closing')
, runtime = require('./runtime')
, utils = require('./utils')
, parseJSExpression = require('character-parser').parseMax
, isConstant = require('constantinople')
, toConstant = require('constantinople').toConstant
/**
* Initialize `Compiler` with the given `node`.
*
* @param {Node} node
* @param {Object} options
* @api public
*/
var Compiler = module.exports = function Compiler(node, options) {
this.options = options = options || {};
this.node = node;
this.hasCompiledDoctype = false;
this.hasCompiledTag = false;
this.pp = options.pretty || false;
this.debug = false !== options.compileDebug;
this.indents = 0;
this.parentIndents = 0;
if (options.doctype) this.setDoctype(options.doctype);
};
/**
* Compiler prototype.
*/
Compiler.prototype = {
/**
* Compile parse tree to JavaScript.
*
* @api public
*/
compile: function(){
this.buf = [];
if (this.pp) this.buf.push("jade.indent = [];");
this.lastBufferedIdx = -1;
this.visit(this.node);
return this.buf.join('\n');
},
/**
* Sets the default doctype `name`. Sets terse mode to `true` when
* html 5 is used, causing self-closing tags to end with ">" vs "/>",
* and boolean attributes are not mirrored.
*
* @param {string} name
* @api public
*/
setDoctype: function(name){
name = name || 'default';
this.doctype = doctypes[name.toLowerCase()] || '<!DOCTYPE ' + name + '>';
this.terse = this.doctype.toLowerCase() == '<!doctype html>';
this.xml = 0 == this.doctype.indexOf('<?xml');
},
/**
* Buffer the given `str` exactly as is or with interpolation
*
* @param {String} str
* @param {Boolean} interpolate
* @api public
*/
buffer: function (str, interpolate) {
var self = this;
if (interpolate) {
var match = /(\\)?([#!]){((?:.|\n)*)$/.exec(str);
if (match) {
this.buffer(str.substr(0, match.index), false);
if (match[1]) { // escape
this.buffer(match[2] + '{', false);
this.buffer(match[3], true);
return;
} else {
try {
var rest = match[3];
var range = parseJSExpression(rest);
var code = ('!' == match[2] ? '' : 'jade.escape') + "((jade.interp = " + range.src + ") == null ? '' : jade.interp)";
} catch (ex) {
throw ex;
//didn't match, just as if escaped
this.buffer(match[2] + '{', false);
this.buffer(match[3], true);
return;
}
this.bufferExpression(code);
this.buffer(rest.substr(range.end + 1), true);
return;
}
}
}
str = JSON.stringify(str);
str = str.substr(1, str.length - 2);
if (this.lastBufferedIdx == this.buf.length) {
if (this.lastBufferedType === 'code') this.lastBuffered += ' + "';
this.lastBufferedType = 'text';
this.lastBuffered += str;
this.buf[this.lastBufferedIdx - 1] = 'buf.push(' + this.bufferStartChar + this.lastBuffered + '");'
} else {
this.buf.push('buf.push("' + str + '");');
this.lastBufferedType = 'text';
this.bufferStartChar = '"';
this.lastBuffered = str;
this.lastBufferedIdx = this.buf.length;
}
},
/**
* Buffer the given `src` so it is evaluated at run time
*
* @param {String} src
* @api public
*/
bufferExpression: function (src) {
var fn = Function('', 'return (' + src + ');');
if (isConstant(src)) {
return this.buffer(fn(), false)
}
if (this.lastBufferedIdx == this.buf.length) {
if (this.lastBufferedType === 'text') this.lastBuffered += '"';
this.lastBufferedType = 'code';
this.lastBuffered += ' + (' + src + ')';
this.buf[this.lastBufferedIdx - 1] = 'buf.push(' + this.bufferStartChar + this.lastBuffered + ');'
} else {
this.buf.push('buf.push(' + src + ');');
this.lastBufferedType = 'code';
this.bufferStartChar = '';
this.lastBuffered = '(' + src + ')';
this.lastBufferedIdx = this.buf.length;
}
},
/**
* Buffer an indent based on the current `indent`
* property and an additional `offset`.
*
* @param {Number} offset
* @param {Boolean} newline
* @api public
*/
prettyIndent: function(offset, newline){
offset = offset || 0;
newline = newline ? '\n' : '';
this.buffer(newline + Array(this.indents + offset).join(' '));
if (this.parentIndents)
this.buf.push("buf.push.apply(buf, jade.indent);");
},
/**
* Visit `node`.
*
* @param {Node} node
* @api public
*/
visit: function(node){
var debug = this.debug;
if (debug) {
this.buf.push('jade.debug.unshift({ lineno: ' + node.line
+ ', filename: ' + (node.filename
? JSON.stringify(node.filename)
: 'jade.debug[0].filename')
+ ' });');
}
// Massive hack to fix our context
// stack for - else[ if] etc
if (false === node.debug && this.debug) {
this.buf.pop();
this.buf.pop();
}
this.visitNode(node);
if (debug) this.buf.push('jade.debug.shift();');
},
/**
* Visit `node`.
*
* @param {Node} node
* @api public
*/
visitNode: function(node){
var name = node.constructor.name
|| node.constructor.toString().match(/function ([^(\s]+)()/)[1];
return this['visit' + name](node);
},
/**
* Visit case `node`.
*
* @param {Literal} node
* @api public
*/
visitCase: function(node){
var _ = this.withinCase;
this.withinCase = true;
this.buf.push('switch (' + node.expr + '){');
this.visit(node.block);
this.buf.push('}');
this.withinCase = _;
},
/**
* Visit when `node`.
*
* @param {Literal} node
* @api public
*/
visitWhen: function(node){
if ('default' == node.expr) {
this.buf.push('default:');
} else {
this.buf.push('case ' + node.expr + ':');
}
this.visit(node.block);
this.buf.push(' break;');
},
/**
* Visit literal `node`.
*
* @param {Literal} node
* @api public
*/
visitLiteral: function(node){
this.buffer(node.str);
},
/**
* Visit all nodes in `block`.
*
* @param {Block} block
* @api public
*/
visitBlock: function(block){
var len = block.nodes.length
, escape = this.escape
, pp = this.pp
// Block keyword has a special meaning in mixins
if (this.parentIndents && block.mode) {
if (pp) this.buf.push("jade.indent.push('" + Array(this.indents + 1).join(' ') + "');")
this.buf.push('block && block();');
if (pp) this.buf.push("jade.indent.pop();")
return;
}
// Pretty print multi-line text
if (pp && len > 1 && !escape && block.nodes[0].isText && block.nodes[1].isText)
this.prettyIndent(1, true);
for (var i = 0; i < len; ++i) {
// Pretty print text
if (pp && i > 0 && !escape && block.nodes[i].isText && block.nodes[i-1].isText)
this.prettyIndent(1, false);
this.visit(block.nodes[i]);
// Multiple text nodes are separated by newlines
if (block.nodes[i+1] && block.nodes[i].isText && block.nodes[i+1].isText)
this.buffer('\n');
}
},
/**
* Visit `doctype`. Sets terse mode to `true` when html 5
* is used, causing self-closing tags to end with ">" vs "/>",
* and boolean attributes are not mirrored.
*
* @param {Doctype} doctype
* @api public
*/
visitDoctype: function(doctype){
if (doctype && (doctype.val || !this.doctype)) {
this.setDoctype(doctype.val || 'default');
}
if (this.doctype) this.buffer(this.doctype);
this.hasCompiledDoctype = true;
},
/**
* Visit `mixin`, generating a function that
* may be called within the template.
*
* @param {Mixin} mixin
* @api public
*/
visitMixin: function(mixin){
var name = mixin.name.replace(/-/g, '_') + '_mixin'
, args = mixin.args || ''
, block = mixin.block
, attrs = mixin.attrs
, pp = this.pp;
if (mixin.call) {
if (pp) this.buf.push("jade.indent.push('" + Array(this.indents + 1).join(' ') + "');")
if (block || attrs.length) {
this.buf.push(name + '.call({');
if (block) {
this.buf.push('block: function(){');
// Render block with no indents, dynamically added when rendered
this.parentIndents++;
var _indents = this.indents;
this.indents = 0;
this.visit(mixin.block);
this.indents = _indents;
this.parentIndents--;
if (attrs.length) {
this.buf.push('},');
} else {
this.buf.push('}');
}
}
if (attrs.length) {
var val = this.attrs(attrs);
if (val.inherits) {
this.buf.push('attributes: jade.merge({' + val.buf
+ '}, attributes), escaped: jade.merge(' + val.escaped + ', escaped, true)');
} else {
this.buf.push('attributes: {' + val.buf + '}, escaped: ' + val.escaped);
}
}
if (args) {
this.buf.push('}, ' + args + ');');
} else {
this.buf.push('});');
}
} else {
this.buf.push(name + '(' + args + ');');
}
if (pp) this.buf.push("jade.indent.pop();")
} else {
this.buf.push('var ' + name + ' = function(' + args + '){');
this.buf.push('var block = this.block, attributes = this.attributes || {}, escaped = this.escaped || {};');
this.parentIndents++;
this.visit(block);
this.parentIndents--;
this.buf.push('};');
}
},
/**
* Visit `tag` buffering tag markup, generating
* attributes, visiting the `tag`'s code and block.
*
* @param {Tag} tag
* @api public
*/
visitTag: function(tag){
this.indents++;
var name = tag.name
, pp = this.pp
, self = this;
function bufferName() {
if (tag.buffer) self.bufferExpression(name);
else self.buffer(name);
}
if (!this.hasCompiledTag) {
if (!this.hasCompiledDoctype && 'html' == name) {
this.visitDoctype();
}
this.hasCompiledTag = true;
}
// pretty print
if (pp && !tag.isInline())
this.prettyIndent(0, true);
if ((~selfClosing.indexOf(name) || tag.selfClosing) && !this.xml) {
this.buffer('<');
bufferName();
this.visitAttributes(tag.attrs);
this.terse
? this.buffer('>')
: this.buffer('/>');
} else {
// Optimize attributes buffering
if (tag.attrs.length) {
this.buffer('<');
bufferName();
if (tag.attrs.length) this.visitAttributes(tag.attrs);
this.buffer('>');
} else {
this.buffer('<');
bufferName();
this.buffer('>');
}
if (tag.code) this.visitCode(tag.code);
this.escape = 'pre' == tag.name;
this.visit(tag.block);
// pretty print
if (pp && !tag.isInline() && 'pre' != tag.name && !tag.canInline())
this.prettyIndent(0, true);
this.buffer('</');
bufferName();
this.buffer('>');
}
this.indents--;
},
/**
* Visit `filter`, throwing when the filter does not exist.
*
* @param {Filter} filter
* @api public
*/
visitFilter: function(filter){
var text = filter.block.nodes.map(
function(node){ return node.val; }
).join('\n');
filter.attrs = filter.attrs || {};
filter.attrs.filename = this.options.filename;
this.buffer(filters(filter.name, text, filter.attrs), true);
},
/**
* Visit `text` node.
*
* @param {Text} text
* @api public
*/
visitText: function(text){
this.buffer(text.val, true);
},
/**
* Visit a `comment`, only buffering when the buffer flag is set.
*
* @param {Comment} comment
* @api public
*/
visitComment: function(comment){
if (!comment.buffer) return;
if (this.pp) this.prettyIndent(1, true);
this.buffer('<!--' + comment.val + '-->');
},
/**
* Visit a `BlockComment`.
*
* @param {Comment} comment
* @api public
*/
visitBlockComment: function(comment){
if (!comment.buffer) return;
if (this.pp) this.prettyIndent(1, true);
if (0 == comment.val.trim().indexOf('if')) {
this.buffer('<!--[' + comment.val.trim() + ']>');
this.visit(comment.block);
if (this.pp) this.prettyIndent(1, true);
this.buffer('<![endif]-->');
} else {
this.buffer('<!--' + comment.val);
this.visit(comment.block);
if (this.pp) this.prettyIndent(1, true);
this.buffer('-->');
}
},
/**
* Visit `code`, respecting buffer / escape flags.
* If the code is followed by a block, wrap it in
* a self-calling function.
*
* @param {Code} code
* @api public
*/
visitCode: function(code){
// Wrap code blocks with {}.
// we only wrap unbuffered code blocks ATM
// since they are usually flow control
// Buffer code
if (code.buffer) {
var val = code.val.trimLeft();
val = 'null == (jade.interp = '+val+') ? "" : jade.interp';
if (code.escape) val = 'jade.escape(' + val + ')';
this.bufferExpression(val);
} else {
this.buf.push(code.val);
}
// Block support
if (code.block) {
if (!code.buffer) this.buf.push('{');
this.visit(code.block);
if (!code.buffer) this.buf.push('}');
}
},
/**
* Visit `each` block.
*
* @param {Each} each
* @api public
*/
visitEach: function(each){
this.buf.push(''
+ '// iterate ' + each.obj + '\n'
+ ';(function(){\n'
+ ' var $$obj = ' + each.obj + ';\n'
+ ' if (\'number\' == typeof $$obj.length) {\n');
if (each.alternative) {
this.buf.push(' if ($$obj.length) {');
}
this.buf.push(''
+ ' for (var ' + each.key + ' = 0, $$l = $$obj.length; ' + each.key + ' < $$l; ' + each.key + '++) {\n'
+ ' var ' + each.val + ' = $$obj[' + each.key + '];\n');
this.visit(each.block);
this.buf.push(' }\n');
if (each.alternative) {
this.buf.push(' } else {');
this.visit(each.alternative);
this.buf.push(' }');
}
this.buf.push(''
+ ' } else {\n'
+ ' var $$l = 0;\n'
+ ' for (var ' + each.key + ' in $$obj) {\n'
+ ' $$l++;'
+ ' var ' + each.val + ' = $$obj[' + each.key + '];\n');
this.visit(each.block);
this.buf.push(' }\n');
if (each.alternative) {
this.buf.push(' if ($$l === 0) {');
this.visit(each.alternative);
this.buf.push(' }');
}
this.buf.push(' }\n}).call(this);\n');
},
/**
* Visit `attrs`.
*
* @param {Array} attrs
* @api public
*/
visitAttributes: function(attrs){
var val = this.attrs(attrs);
if (val.inherits) {
this.bufferExpression("jade.attrs(jade.merge({ " + val.buf +
" }, attributes), jade.merge(" + val.escaped + ", escaped, true))");
} else if (val.constant) {
this.buffer(runtime.attrs(toConstant('{' + val.buf + '}'), JSON.parse(val.escaped)));
} else {
this.bufferExpression("jade.attrs({ " + val.buf + " }, " + val.escaped + ")");
}
},
/**
* Compile attributes.
*/
attrs: function(attrs){
var buf = []
, classes = []
, escaped = {}
, constant = attrs.every(function(attr){ return isConstant(attr.val) })
, inherits = false;
if (this.terse) buf.push('terse: true');
attrs.forEach(function(attr){
if (attr.name == 'attributes') return inherits = true;
escaped[attr.name] = attr.escaped;
if (attr.name == 'class') {
classes.push('(' + attr.val + ')');
} else {
var pair = "'" + attr.name + "':(" + attr.val + ')';
buf.push(pair);
}
});
if (classes.length) {
buf.push('"class": [' + classes.join(',') + ']');
}
return {
buf: buf.join(', '),
escaped: JSON.stringify(escaped),
inherits: inherits,
constant: constant
};
}
};
},{"./doctypes":2,"./filters":3,"./nodes":16,"./runtime":23,"./self-closing":24,"./utils":25,"character-parser":31,"constantinople":32}],2:[function(require,module,exports){
/*!
* Jade - doctypes
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
module.exports = {
'5': '<!DOCTYPE html>'
, 'default': '<!DOCTYPE html>'
, 'xml': '<?xml version="1.0" encoding="utf-8" ?>'
, 'transitional': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">'
, 'strict': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">'
, 'frameset': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">'
, '1.1': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
, 'basic': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">'
, 'mobile': '<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.2//EN" "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile12.dtd">'
};
},{}],3:[function(require,module,exports){
/*!
* Jade - filters
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
module.exports = filter;
function filter(name, str, options) {
if (typeof filter[name] === 'function') {
var res = filter[name](str, options);
} else {
throw new Error('unknown filter ":' + name + '"');
}
return res;
}
filter.exists = function (name, str, options) {
return typeof filter[name] === 'function';
};
},{}],4:[function(require,module,exports){
/*!
* Jade - inline tags
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
module.exports = [
'a'
, 'abbr'
, 'acronym'
, 'b'
, 'br'
, 'code'
, 'em'
, 'font'
, 'i'
, 'img'
, 'ins'
, 'kbd'
, 'map'
, 'samp'
, 'small'
, 'span'
, 'strong'
, 'sub'
, 'sup'
];
},{}],5:[function(require,module,exports){
/*!
* Jade
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var Parser = require('./parser')
, Lexer = require('./lexer')
, Compiler = require('./compiler')
, runtime = require('./runtime')
, addWith = require('with')
, fs = require('fs');
/**
* Expose self closing tags.
*/
exports.selfClosing = require('./self-closing');
/**
* Default supported doctypes.
*/
exports.doctypes = require('./doctypes');
/**
* Text filters.
*/
exports.filters = require('./filters');
/**
* Utilities.
*/
exports.utils = require('./utils');
/**
* Expose `Compiler`.
*/
exports.Compiler = Compiler;
/**
* Expose `Parser`.
*/
exports.Parser = Parser;
/**
* Expose `Lexer`.
*/
exports.Lexer = Lexer;
/**
* Nodes.
*/
exports.nodes = require('./nodes');
/**
* Jade runtime helpers.
*/
exports.runtime = runtime;
/**
* Template function cache.
*/
exports.cache = {};
/**
* Parse the given `str` of jade and return a function body.
*
* @param {String} str
* @param {Object} options
* @return {String}
* @api private
*/
function parse(str, options){
try {
// Parse
var parser = new (options.parser || Parser)(str, options.filename, options);
// Compile
var compiler = new (options.compiler || Compiler)(parser.parse(), options)
, js = compiler.compile();
// Debug compiler
if (options.debug) {
console.error('\nCompiled Function:\n\n\033[90m%s\033[0m', js.replace(/^/gm, ' '));
}
return ''
+ 'var buf = [];\n'
+ (options.self
? 'var self = locals || {};\n' + js
: addWith('locals || {}', js, ['jade', 'buf'])) + ';'
+ 'return buf.join("");';
} catch (err) {
parser = parser.context();
runtime.rethrow(err, parser.filename, parser.lexer.lineno, str);
}
}
/**
* Compile a `Function` representation of the given jade `str`.
*
* Options:
*
* - `compileDebug` when `false` debugging code is stripped from the compiled
template, when it is explicitly `true`, the source code is included in
the compiled template for better accuracy.
* - `filename` used to improve errors when `compileDebug` is not `false`
*
* @param {String} str
* @param {Options} options
* @return {Function}
* @api public
*/
exports.compile = function(str, options){
var options = options || {}
, filename = options.filename
? JSON.stringify(options.filename)
: 'undefined'
, fn;
str = String(str);
if (options.compileDebug !== false) {
fn = [
'jade.debug = [{ lineno: 1, filename: ' + filename + ' }];'
, 'try {'
, parse(str, options)
, '} catch (err) {'
, ' jade.rethrow(err, jade.debug[0].filename, jade.debug[0].lineno' + (options.compileDebug === true ? ',' + JSON.stringify(str) : '') + ');'
, '}'
].join('\n');
} else {
fn = parse(str, options);
}
if (options.client) return new Function('locals', fn)
fn = new Function('locals, jade', fn)
return function(locals){ return fn(locals, Object.create(runtime)) }
};
/**
* Render the given `str` of jade.
*
* Options:
*
* - `cache` enable template caching
* - `filename` filename required for `include` / `extends` and caching
*
* @param {String} str
* @param {Object|Function} options or fn
* @param {Function|undefined} fn
* @returns {String}
* @api public
*/
exports.render = function(str, options, fn){
// support callback API
if ('function' == typeof options) {
fn = options, options = undefined;
}
if (typeof fn === 'function') {
var res
try {
res = exports.render(str, options);
} catch (ex) {
return fn(ex);
}
return fn(null, res);
}
options = options || {};
// cache requires .filename
if (options.cache && !options.filename) {
throw new Error('the "filename" option is required for caching');
}
var path = options.filename;
var tmpl = options.cache
? exports.cache[path] || (exports.cache[path] = exports.compile(str, options))
: exports.compile(str, options);
return tmpl(options);
};
/**
* Render a Jade file at the given `path`.
*
* @param {String} path
* @param {Object|Function} options or callback
* @param {Function|undefined} fn
* @returns {String}
* @api public
*/
exports.renderFile = function(path, options, fn){
// support callback API
if ('function' == typeof options) {
fn = options, options = undefined;
}
if (typeof fn === 'function') {
var res
try {
res = exports.renderFile(path, options);
} catch (ex) {
return fn(ex);
}
return fn(null, res);
}
options = options || {};
var key = path + ':string';
options.filename = path;
var str = options.cache
? exports.cache[key] || (exports.cache[key] = fs.readFileSync(path, 'utf8'))
: fs.readFileSync(path, 'utf8');
return exports.render(str, options);
};
/**
* Express support.
*/
exports.__express = exports.renderFile;
},{"./compiler":1,"./doctypes":2,"./filters":3,"./lexer":6,"./nodes":16,"./parser":22,"./runtime":23,"./self-closing":24,"./utils":25,"fs":27,"with":44}],6:[function(require,module,exports){
/*!
* Jade - Lexer
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
var utils = require('./utils');
var characterParser = require('character-parser');
/**
* Initialize `Lexer` with the given `str`.
*
* Options:
*
* - `colons` allow colons for attr delimiters
*
* @param {String} str
* @param {Object} options
* @api private
*/
var Lexer = module.exports = function Lexer(str, options) {
options = options || {};
this.input = str.replace(/\r\n|\r/g, '\n');
this.colons = options.colons;
this.deferredTokens = [];
this.lastIndents = 0;
this.lineno = 1;
this.stash = [];
this.indentStack = [];
this.indentRe = null;
this.pipeless = false;
};
function assertExpression(exp) {
//this verifies that a JavaScript expression is valid
Function('', 'return (' + exp + ')');