app/assets/javascripts/mustache.js
/*!
* mustache.js - Logic-less {{mustache}} templates with JavaScript
* http://github.com/janl/mustache.js
*/
/*global define: false*/
(function (root, factory) {
if (typeof exports === "object" && exports) {
factory(exports); // CommonJS
} else {
var mustache = {};
factory(mustache);
if (typeof define === "function" && define.amd) {
define(mustache); // AMD
} else {
root.Mustache = mustache; // <script>
}
}
}(this, function (mustache) {
var whiteRe = /\s*/;
var spaceRe = /\s+/;
var nonSpaceRe = /\S/;
var eqRe = /\s*=/;
var curlyRe = /\s*\}/;
var tagRe = /#|\^|\/|>|\{|&|=|!/;
// Workaround for https://issues.apache.org/jira/browse/COUCHDB-577
// See https://github.com/janl/mustache.js/issues/189
var RegExp_test = RegExp.prototype.test;
function testRegExp(re, string) {
return RegExp_test.call(re, string);
}
function isWhitespace(string) {
return !testRegExp(nonSpaceRe, string);
}
var Object_toString = Object.prototype.toString;
var isArray = Array.isArray || function (object) {
return Object_toString.call(object) === '[object Array]';
};
function isFunction(object) {
return typeof object === 'function';
}
function escapeRegExp(string) {
return string.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, "\\$&");
}
var entityMap = {
"&": "&",
"<": "<",
">": ">",
'"': '"',
"'": ''',
"/": '/'
};
function escapeHtml(string) {
return String(string).replace(/[&<>"'\/]/g, function (s) {
return entityMap[s];
});
}
function Scanner(string) {
this.string = string;
this.tail = string;
this.pos = 0;
}
/**
* Returns `true` if the tail is empty (end of string).
*/
Scanner.prototype.eos = function () {
return this.tail === "";
};
/**
* Tries to match the given regular expression at the current position.
* Returns the matched text if it can match, the empty string otherwise.
*/
Scanner.prototype.scan = function (re) {
var match = this.tail.match(re);
if (match && match.index === 0) {
var string = match[0];
this.tail = this.tail.substring(string.length);
this.pos += string.length;
return string;
}
return "";
};
/**
* Skips all text until the given regular expression can be matched. Returns
* the skipped string, which is the entire tail if no match can be made.
*/
Scanner.prototype.scanUntil = function (re) {
var index = this.tail.search(re), match;
switch (index) {
case -1:
match = this.tail;
this.tail = "";
break;
case 0:
match = "";
break;
default:
match = this.tail.substring(0, index);
this.tail = this.tail.substring(index);
}
this.pos += match.length;
return match;
};
function Context(view, parent) {
this.view = view == null ? {} : view;
this.parent = parent;
this._cache = { '.': this.view };
}
Context.make = function (view) {
return (view instanceof Context) ? view : new Context(view);
};
Context.prototype.push = function (view) {
return new Context(view, this);
};
Context.prototype.lookup = function (name) {
var value;
if (name in this._cache) {
value = this._cache[name];
} else {
var context = this;
while (context) {
if (name.indexOf('.') > 0) {
value = context.view;
var names = name.split('.'), i = 0;
while (value != null && i < names.length) {
value = value[names[i++]];
}
} else {
value = context.view[name];
}
if (value != null) break;
context = context.parent;
}
this._cache[name] = value;
}
if (isFunction(value)) {
value = value.call(this.view);
}
return value;
};
function Writer() {
this.clearCache();
}
Writer.prototype.clearCache = function () {
this._cache = {};
this._partialCache = {};
};
Writer.prototype.compile = function (template, tags) {
var fn = this._cache[template];
if (!fn) {
var tokens = mustache.parse(template, tags);
fn = this._cache[template] = this.compileTokens(tokens, template);
}
return fn;
};
Writer.prototype.compilePartial = function (name, template, tags) {
var fn = this.compile(template, tags);
this._partialCache[name] = fn;
return fn;
};
Writer.prototype.getPartial = function (name) {
if (!(name in this._partialCache) && this._loadPartial) {
this.compilePartial(name, this._loadPartial(name));
}
return this._partialCache[name];
};
Writer.prototype.compileTokens = function (tokens, template) {
var self = this;
return function (view, partials) {
if (partials) {
if (isFunction(partials)) {
self._loadPartial = partials;
} else {
for (var name in partials) {
self.compilePartial(name, partials[name]);
}
}
}
return renderTokens(tokens, self, Context.make(view), template);
};
};
Writer.prototype.render = function (template, view, partials) {
return this.compile(template)(view, partials);
};
/**
* Low-level function that renders the given `tokens` using the given `writer`
* and `context`. The `template` string is only needed for templates that use
* higher-order sections to extract the portion of the original template that
* was contained in that section.
*/
function renderTokens(tokens, writer, context, template) {
var buffer = '';
// This function is used to render an artbitrary template
// in the current context by higher-order functions.
function subRender(template) {
return writer.render(template, context);
}
var token, tokenValue, value;
for (var i = 0, len = tokens.length; i < len; ++i) {
token = tokens[i];
tokenValue = token[1];
switch (token[0]) {
case '#':
value = context.lookup(tokenValue);
if (typeof value === 'object' || typeof value === 'string') {
if (isArray(value)) {
for (var j = 0, jlen = value.length; j < jlen; ++j) {
buffer += renderTokens(token[4], writer, context.push(value[j]), template);
}
} else if (value) {
buffer += renderTokens(token[4], writer, context.push(value), template);
}
} else if (isFunction(value)) {
var text = template == null ? null : template.slice(token[3], token[5]);
value = value.call(context.view, text, subRender);
if (value != null) buffer += value;
} else if (value) {
buffer += renderTokens(token[4], writer, context, template);
}
break;
case '^':
value = context.lookup(tokenValue);
// Use JavaScript's definition of falsy. Include empty arrays.
// See https://github.com/janl/mustache.js/issues/186
if (!value || (isArray(value) && value.length === 0)) {
buffer += renderTokens(token[4], writer, context, template);
}
break;
case '>':
value = writer.getPartial(tokenValue);
if (isFunction(value)) buffer += value(context);
break;
case '&':
value = context.lookup(tokenValue);
if (value != null) buffer += value;
break;
case 'name':
value = context.lookup(tokenValue);
if (value != null) buffer += mustache.escape(value);
break;
case 'text':
buffer += tokenValue;
break;
}
}
return buffer;
}
/**
* Forms the given array of `tokens` into a nested tree structure where
* tokens that represent a section have two additional items: 1) an array of
* all tokens that appear in that section and 2) the index in the original
* template that represents the end of that section.
*/
function nestTokens(tokens) {
var tree = [];
var collector = tree;
var sections = [];
var token;
for (var i = 0, len = tokens.length; i < len; ++i) {
token = tokens[i];
switch (token[0]) {
case '#':
case '^':
sections.push(token);
collector.push(token);
collector = token[4] = [];
break;
case '/':
var section = sections.pop();
section[5] = token[2];
collector = sections.length > 0 ? sections[sections.length - 1][4] : tree;
break;
default:
collector.push(token);
}
}
return tree;
}
/**
* Combines the values of consecutive text tokens in the given `tokens` array
* to a single token.
*/
function squashTokens(tokens) {
var squashedTokens = [];
var token, lastToken;
for (var i = 0, len = tokens.length; i < len; ++i) {
token = tokens[i];
if (token) {
if (token[0] === 'text' && lastToken && lastToken[0] === 'text') {
lastToken[1] += token[1];
lastToken[3] = token[3];
} else {
lastToken = token;
squashedTokens.push(token);
}
}
}
return squashedTokens;
}
function escapeTags(tags) {
return [
new RegExp(escapeRegExp(tags[0]) + "\\s*"),
new RegExp("\\s*" + escapeRegExp(tags[1]))
];
}
/**
* Breaks up the given `template` string into a tree of token objects. If
* `tags` is given here it must be an array with two string values: the
* opening and closing tags used in the template (e.g. ["<%", "%>"]). Of
* course, the default is to use mustaches (i.e. Mustache.tags).
*/
function parseTemplate(template, tags) {
template = template || '';
tags = tags || mustache.tags;
if (typeof tags === 'string') tags = tags.split(spaceRe);
if (tags.length !== 2) throw new Error('Invalid tags: ' + tags.join(', '));
var tagRes = escapeTags(tags);
var scanner = new Scanner(template);
var sections = []; // Stack to hold section tokens
var tokens = []; // Buffer to hold the tokens
var spaces = []; // Indices of whitespace tokens on the current line
var hasTag = false; // Is there a {{tag}} on the current line?
var nonSpace = false; // Is there a non-space char on the current line?
// Strips all whitespace tokens array for the current line
// if there was a {{#tag}} on it and otherwise only space.
function stripSpace() {
if (hasTag && !nonSpace) {
while (spaces.length) {
delete tokens[spaces.pop()];
}
} else {
spaces = [];
}
hasTag = false;
nonSpace = false;
}
var start, type, value, chr, token, openSection;
while (!scanner.eos()) {
start = scanner.pos;
// Match any text between tags.
value = scanner.scanUntil(tagRes[0]);
if (value) {
for (var i = 0, len = value.length; i < len; ++i) {
chr = value.charAt(i);
if (isWhitespace(chr)) {
spaces.push(tokens.length);
} else {
nonSpace = true;
}
tokens.push(['text', chr, start, start + 1]);
start += 1;
// Check for whitespace on the current line.
if (chr == '\n') stripSpace();
}
}
// Match the opening tag.
if (!scanner.scan(tagRes[0])) break;
hasTag = true;
// Get the tag type.
type = scanner.scan(tagRe) || 'name';
scanner.scan(whiteRe);
// Get the tag value.
if (type === '=') {
value = scanner.scanUntil(eqRe);
scanner.scan(eqRe);
scanner.scanUntil(tagRes[1]);
} else if (type === '{') {
value = scanner.scanUntil(new RegExp('\\s*' + escapeRegExp('}' + tags[1])));
scanner.scan(curlyRe);
scanner.scanUntil(tagRes[1]);
type = '&';
} else {
value = scanner.scanUntil(tagRes[1]);
}
// Match the closing tag.
if (!scanner.scan(tagRes[1])) throw new Error('Unclosed tag at ' + scanner.pos);
token = [type, value, start, scanner.pos];
tokens.push(token);
if (type === '#' || type === '^') {
sections.push(token);
} else if (type === '/') {
// Check section nesting.
openSection = sections.pop();
if (!openSection) {
throw new Error('Unopened section "' + value + '" at ' + start);
}
if (openSection[1] !== value) {
throw new Error('Unclosed section "' + openSection[1] + '" at ' + start);
}
} else if (type === 'name' || type === '{' || type === '&') {
nonSpace = true;
} else if (type === '=') {
// Set the tags for the next time around.
tags = value.split(spaceRe);
if (tags.length !== 2) {
throw new Error('Invalid tags at ' + start + ': ' + tags.join(', '));
}
tagRes = escapeTags(tags);
}
}
// Make sure there are no open sections when we're done.
openSection = sections.pop();
if (openSection) {
throw new Error('Unclosed section "' + openSection[1] + '" at ' + scanner.pos);
}
return nestTokens(squashTokens(tokens));
}
mustache.name = "mustache.js";
mustache.version = "0.7.3";
mustache.tags = ["{{", "}}"];
mustache.Scanner = Scanner;
mustache.Context = Context;
mustache.Writer = Writer;
mustache.parse = parseTemplate;
// Export the escaping function so that the user may override it.
// See https://github.com/janl/mustache.js/issues/244
mustache.escape = escapeHtml;
// All Mustache.* functions use this writer.
var defaultWriter = new Writer();
/**
* Clears all cached templates and partials in the default writer.
*/
mustache.clearCache = function () {
return defaultWriter.clearCache();
};
/**
* Compiles the given `template` to a reusable function using the default
* writer.
*/
mustache.compile = function (template, tags) {
return defaultWriter.compile(template, tags);
};
/**
* Compiles the partial with the given `name` and `template` to a reusable
* function using the default writer.
*/
mustache.compilePartial = function (name, template, tags) {
return defaultWriter.compilePartial(name, template, tags);
};
/**
* Compiles the given array of tokens (the output of a parse) to a reusable
* function using the default writer.
*/
mustache.compileTokens = function (tokens, template) {
return defaultWriter.compileTokens(tokens, template);
};
/**
* Renders the `template` with the given `view` and `partials` using the
* default writer.
*/
mustache.render = function (template, view, partials) {
return defaultWriter.render(template, view, partials);
};
// This is here for backwards compatibility with 0.4.x.
mustache.to_html = function (template, view, partials, send) {
var result = mustache.render(template, view, partials);
if (isFunction(send)) {
send(result);
} else {
return result;
}
};
}));