/*

  mustache.js — Logic-less templates in JavaScript

  See http://mustache.github.com/ for more info.

*/

var Mustache = function() {

  var regexCache = {};

  var Renderer = function() {};

  Renderer.prototype = {

    otag: "{{",

    ctag: "}}",

    pragmas: {},

    buffer: [],

    pragmas_implemented: {

      "IMPLICIT-ITERATOR": true

    },

    context: {},

    render: function(template, context, partials, in_recursion) {

      // reset buffer & set context

      if(!in_recursion) {

        this.context = context;

        this.buffer = []; // TODO: make this non-lazy

      }

      // fail fast

      if(!this.includes("", template)) {

        if(in_recursion) {

          return template;

        } else {

          this.send(template);

          return;

        }

      }

      // get the pragmas together

      template = this.render_pragmas(template);

      // render the template

      var html = this.render_section(template, context, partials);

      // render_section did not find any sections, we still need to render the tags

      if (html === false) {

        html = this.render_tags(template, context, partials, in_recursion);

      }

      if (in_recursion) {

        return html;

      } else {

        this.sendLines(html);

      }

    },

    /*

      Sends parsed lines

    */

    send: function(line) {

      if(line !== "") {

        this.buffer.push(line);

      }

    },

    sendLines: function(text) {

      if (text) {

        var lines = text.split("\n");

        for (var i = 0; i < lines.length; i++) {

          this.send(lines[i]);

        }

      }

    },

    /*

      Looks for %PRAGMAS

    */

    render_pragmas: function(template) {

      // no pragmas

      if(!this.includes("%", template)) {

        return template;

      }

      var that = this;

      var regex = this.getCachedRegex("render_pragmas", function(otag, ctag) {

        return new RegExp(otag + "%([\\w-]+) ?([\\w]+=[\\w]+)?" + ctag, "g");

      });

      return template.replace(regex, function(match, pragma, options) {

        if(!that.pragmas_implemented[pragma]) {

          throw({message:

            "This implementation of mustache doesn't understand the '" +

            pragma + "' pragma"});

        }

        that.pragmas[pragma] = {};

        if(options) {

          var opts = options.split("=");

          that.pragmas[pragma][opts[0]] = opts[1];

        }

        return "";

        // ignore unknown pragmas silently

      });

    },

    /*

      Tries to find a partial in the curent scope and render it

    */

    render_partial: function(name, context, partials) {

      name = this.trim(name);

      if(!partials || partials[name] === undefined) {

        throw({message: "unknown_partial '" + name + "'"});

      }

      if(typeof(context[name]) != "object") {

        return this.render(partials[name], context, partials, true);

      }

      return this.render(partials[name], context[name], partials, true);

    },

    /*

      Renders inverted (^) and normal (#) sections

    */

    render_section: function(template, context, partials) {

      if(!this.includes("#", template) && !this.includes("^", template)) {

        // did not render anything, there were no sections

        return false;

      }

      var that = this;

      var regex = this.getCachedRegex("render_section", function(otag, ctag) {

        // This regex matches _the first_ section ({{#foo}}{{/foo}}), and captures the remainder

        return new RegExp(

          "^([\\s\\S]*?)" +         // all the crap at the beginning that is not {{*}} ($1)

          otag +                    // {{

          "(\\^|\\#)\\s*(.+)\\s*" + //  #foo (# == $2, foo == $3)

          ctag +                    // }}

          "\n*([\\s\\S]*?)" +       // between the tag ($2). leading newlines are dropped

          otag +                    // {{

          "\\/\\s*\\3\\s*" +        //  /foo (backreference to the opening tag).

          ctag +                    // }}

          "\\s*([\\s\\S]*)$",       // everything else in the string ($4). leading whitespace is dropped.

        "g");

      });

      // for each {{#foo}}{{/foo}} section do...

      return template.replace(regex, function(match, before, type, name, content, after) {

        // before contains only tags, no sections

        var renderedBefore = before ? that.render_tags(before, context, partials, true) : "",

        // after may contain both sections and tags, so use full rendering function

            renderedAfter = after ? that.render(after, context, partials, true) : "",

        // will be computed below

            renderedContent,

            value = that.find(name, context);

        if (type === "^") { // inverted section

          if (!value || that.is_array(value) && value.length === 0) {

            // false or empty list, render it

            renderedContent = that.render(content, context, partials, true);

          } else {

            renderedContent = "";

          }

        } else if (type === "#") { // normal section

          if (that.is_array(value)) { // Enumerable, Let's loop!

            renderedContent = that.map(value, function(row) {

              return that.render(content, that.create_context(row), partials, true);

            }).join("");

          } else if (that.is_object(value)) { // Object, Use it as subcontext!

            renderedContent = that.render(content, that.create_context(value),

              partials, true);

          } else if (typeof value === "function") {

            // higher order section

            renderedContent = value.call(context, content, function(text) {

              return that.render(text, context, partials, true);

            });

          } else if (value) { // boolean section

            renderedContent = that.render(content, context, partials, true);

          } else {

            renderedContent = "";

          }

        }

        return renderedBefore + renderedContent + renderedAfter;

      });

    },

    /*

      Replace {{foo}} and friends with values from our view

    */

    render_tags: function(template, context, partials, in_recursion) {

      // tit for tat

      var that = this;

      var new_regex = function() {

        return that.getCachedRegex("render_tags", function(otag, ctag) {

          return new RegExp(otag + "(=|!|>|\\{|%)?([^\\/#\\^]+?)\\1?" + ctag + "+", "g");

        });

      };

      var regex = new_regex();

      var tag_replace_callback = function(match, operator, name) {

        switch(operator) {

        case "!": // ignore comments

          return "";

        case "=": // set new delimiters, rebuild the replace regexp

          that.set_delimiters(name);

          regex = new_regex();

          return "";

        case ">": // render partial

          return that.render_partial(name, context, partials);

        case "{": // the triple mustache is unescaped

          return that.find(name, context);

        default: // escape the value

          return that.escape(that.find(name, context));

        }

      };

      var lines = template.split("\n");

      for(var i = 0; i < lines.length; i++) {

        lines[i] = lines[i].replace(regex, tag_replace_callback, this);

        if(!in_recursion) {

          this.send(lines[i]);

        }

      }

      if(in_recursion) {

        return lines.join("\n");

      }

    },

    set_delimiters: function(delimiters) {

      var dels = delimiters.split(" ");

      this.otag = this.escape_regex(dels[0]);

      this.ctag = this.escape_regex(dels[1]);

    },

    escape_regex: function(text) {

      // thank you Simon Willison

      if(!arguments.callee.sRE) {

        var specials = [

          '/', '.', '*', '+', '?', '|',

          '(', ')', '[', ']', '{', '}', '\\'

        ];

        arguments.callee.sRE = new RegExp(

          '(\\' + specials.join('|\\') + ')', 'g'

        );

      }

      return text.replace(arguments.callee.sRE, '\\$1');

    },

    /*

      find `name` in current `context`. That is find me a value

      from the view object

    */

    find: function(name, context) {

      name = this.trim(name);

      // Checks whether a value is thruthy or false or 0

      function is_kinda_truthy(bool) {

        return bool === false || bool === 0 || bool;

      }

      var value;

      if(is_kinda_truthy(context[name])) {

        value = context[name];

      } else if(is_kinda_truthy(this.context[name])) {

        value = this.context[name];

      }

      if(typeof value === "function") {

        return value.apply(context);

      }

      if(value !== undefined) {

        return value;

      }

      // silently ignore unkown variables

      return "";

    },

    // Utility methods

    /* includes tag */

    includes: function(needle, haystack) {

      return haystack.indexOf(this.otag + needle) != -1;

    },

    /*

      Does away with nasty characters

    */

    escape: function(s) {

      s = String(s === null ? "" : s);

      return s.replace(/&(?!\w+;)|["'<>\\]/g, function(s) {

        switch(s) {

        case "&": return "&";        

        case '"': return '"';

        case "'": return ''';

        case "<": return "&lt;";

        case ">": return ">";

        default: return s;

        }

      });

    },

    // by @langalex, support for arrays of strings

    create_context: function(_context) {

      if(this.is_object(_context)) {

        return _context;

      } else {

        var iterator = ".";

        if(this.pragmas["IMPLICIT-ITERATOR"]) {

          iterator = this.pragmas["IMPLICIT-ITERATOR"].iterator;

        }

        var ctx = {};

        ctx[iterator] = _context;

        return ctx;

      }

    },

    is_object: function(a) {

      return a && typeof a == "object";

    },

    is_array: function(a) {

      return Object.prototype.toString.call(a) === '[object Array]';

    },

    /*

      Gets rid of leading and trailing whitespace

    */

    trim: function(s) {

      return s.replace(/^\s*|\s*$/g, "");

    },

    /*

      Why, why, why? Because IE. Cry, cry cry.

    */

    map: function(array, fn) {

      if (typeof array.map == "function") {

        return array.map(fn);

      } else {

        var r = [];

        var l = array.length;

        for(var i = 0; i < l; i++) {

          r.push(fn(array[i]));

        }

        return r;

      }

    },

    getCachedRegex: function(name, generator) {

      var byOtag = regexCache[this.otag];

      if (!byOtag) {

        byOtag = regexCache[this.otag] = {};