/*!
 * mustache.js - Logic-less {{mustache}} templates with JavaScript
 * http://github.com/janl/mustache.js
 */

/*global define: false Mustache: true*/

(function defineMustache (global, factory) {
    if (typeof exports === 'object' && exports && typeof exports.nodeName !== 'string') {
        factory(exports); // CommonJS
    } else if (typeof define === 'function' && define.amd) {
        define(['exports'], factory); // AMD
    } else {
        global.Mustache = {};
        factory(global.Mustache); // script, wsh, asp
    }
}(this, function mustacheFactory (mustache) {

    var objectToString = Object.prototype.toString;
    var isArray = Array.isArray || function isArrayPolyfill (object) {
        return objectToString.call(object) === '[object Array]';
    };

    function isFunction (object) {
        return typeof object === 'function';
    }

    /**
     * More correct typeof string handling array
     * which normally returns typeof 'object'
     */
    function typeStr (obj) {
        return isArray(obj) ? 'array' : typeof obj;
    }

    function escapeRegExp (string) {
        return string.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&');
    }

    /**
     * Null safe way of checking whether or not an object,
     * including its prototype, has a given property
     */
    function hasProperty (obj, propName) {
        return obj != null && typeof obj === 'object' && (propName in obj);
    }

    // Workaround for https://issues.apache.org/jira/browse/COUCHDB-577
    // See https://github.com/janl/mustache.js/issues/189
    var regExpTest = RegExp.prototype.test;
    function testRegExp (re, string) {
        return regExpTest.call(re, string);
    }

    var nonSpaceRe = /\S/;
    function isWhitespace (string) {
        return !testRegExp(nonSpaceRe, string);
    }

    var entityMap = {
        '&': '&amp;',
        '<': '&lt;',
        '>': '&gt;',
        '"': '&quot;',
        "'": '&#39;',
        '/': '&#x2F;',
        '`': '&#x60;',
        '=': '&#x3D;'
    };

    function escapeHtml (string) {
        return String(string).replace(/[&<>"'`=\/]/g, function fromEntityMap (s) {
            return entityMap[s];
        });
    }

    var whiteRe = /\s*/;
    var spaceRe = /\s+/;
    var equalsRe = /\s*=/;
    var curlyRe = /\s*\}/;
    var tagRe = /#|\^|\/|>|\{|&|=|!/;

    /**
     * Breaks up the given `template` string into a tree of tokens. If the `tags`
     * argument 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).
     *
     * A token is an array with at least 4 elements. The first element is the
     * mustache symbol that was used inside the tag, e.g. "#" or "&". If the tag
     * did not contain a symbol (i.e. {{myValue}}) this element is "name". For
     * all text that appears outside a symbol this element is "text".
     *
     * The second element of a token is its "value". For mustache tags this is
     * whatever else was inside the tag besides the opening symbol. For text tokens
     * this is the text itself.
     *
     * The third and fourth elements of the token are the start and end indices,
     * respectively, of the token in the original template.
     *
     * Tokens that are the root node of a subtree contain two more elements: 1) an
     * array of tokens in the subtree and 2) the index in the original template at
     * which the closing tag for that section begins.
     */
    function parseTemplate (template, tags) {
        if (!template)
            return [];

        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 openingTagRe, closingTagRe, closingCurlyRe;
        function compileTags (tagsToCompile) {
            if (typeof tagsToCompile === 'string')
                tagsToCompile = tagsToCompile.split(spaceRe, 2);

            if (!isArray(tagsToCompile) || tagsToCompile.length !== 2)
                throw new Error('Invalid tags: ' + tagsToCompile);

            openingTagRe = new RegExp(escapeRegExp(tagsToCompile[0]) + '\\s*');
            closingTagRe = new RegExp('\\s*' + escapeRegExp(tagsToCompile[1]));
            closingCurlyRe = new RegExp('\\s*' + escapeRegExp('}' + tagsToCompile[1]));
        }

        compileTags(tags || mustache.tags);

        var scanner = new Scanner(template);

        var start, type, value, chr, token, openSection;
        while (!scanner.eos()) {
            start = scanner.pos;

            // Match any text between tags.
            value = scanner.scanUntil(openingTagRe);

            if (value) {
                for (var i = 0, valueLength = value.length; i < valueLength; ++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(openingTagRe))
                break;

            hasTag = true;

            // Get the tag type.
            type = scanner.scan(tagRe) || 'name';
            scanner.scan(whiteRe);

            // Get the tag value.
            if (type === '=') {
                value = scanner.scanUntil(equalsRe);
                scanner.scan(equalsRe);
                scanner.scanUntil(closingTagRe);
            } else if (type === '{') {
                value = scanner.scanUntil(closingCurlyRe);
                scanner.scan(curlyRe);
                scanner.scanUntil(closingTagRe);
                type = '&';
            } else {
                value = scanner.scanUntil(closingTagRe);
            }

            // Match the closing tag.
            if (!scanner.scan(closingTagRe))
                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.
                compileTags(value);
            }
        }

        // 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));
    }

    /**
     * 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, numTokens = tokens.length; i < numTokens; ++i) {
            token = tokens[i];

            if (token) {
                if (token[0] === 'text' && lastToken && lastToken[0] === 'text') {
                    lastToken[1] += token[1];
                    lastToken[3] = token[3];
                } else {
                    squashedTokens.push(token);
                    lastToken = token;
                }
            }
        }

        return squashedTokens;
    }

    /**
     * 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 nestedTokens = [];
        var collector = nestedTokens;
        var sections = [];

        var token, section;
        for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) {
            token = tokens[i];

            switch (token[0]) {
                case '#':
                case '^':
                    collector.push(token);
                    sections.push(token);
                    collector = token[4] = [];
                    break;
                case '/':
                    section = sections.pop();
                    section[5] = token[2];
                    collector = sections.length > 0 ? sections[sections.length - 1][4] : nestedTokens;
                    break;
                default:
                    collector.push(token);
            }
        }

        return nestedTokens;
    }

    /**
     * A simple string scanner that is used by the template parser to find
     * tokens in template strings.
     */
    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 eos () {
        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 scan (re) {
        var match = this.tail.match(re);

        if (!match || match.index !== 0)
            return '';

        var string = match[0];

        this.tail = this.tail.substring(string.length);
        this.pos += string.length;

        return string;
    };

    /**
     * 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 scanUntil (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;
    };

    /**
     * Represents a rendering context by wrapping a view object and
     * maintaining a reference to the parent context.
     */
    function Context (view, parentContext) {
        this.view = view;
        this.cache = { '.': this.view };
        this.parent = parentContext;
    }

    /**
     * Creates a new context using the given view with this context
     * as the parent.
     */
    Context.prototype.push = function push (view) {
        return new Context(view, this);
    };

    /**
     * Returns the value of the given name in this context, traversing
     * up the context hierarchy if the value is absent in this context's view.
     */
    Context.prototype.lookup = function lookup (name) {
        var cache = this.cache;

        var value;
        if (cache.hasOwnProperty(name)) {
            value = cache[name];
        } else {
            var context = this, names, index, lookupHit = false;

            while (context) {
                if (name.indexOf('.') > 0) {
                    value = context.view;
                    names = name.split('.');
                    index = 0;

                    /**
                     * Using the dot notion path in `name`, we descend through the
                     * nested objects.
                     *
                     * To be certain that the lookup has been successful, we have to
                     * check if the last object in the path actually has the property
                     * we are looking for. We store the result in `lookupHit`.
                     *
                     * This is specially necessary for when the value has been set to
                     * `undefined` and we want to avoid looking up parent contexts.
                     **/
                    while (value != null && index < names.length) {
                        if (index === names.length - 1)
                            lookupHit = hasProperty(value, names[index]);

                        value = value[names[index++]];
                    }
                } else {
                    value = context.view[name];
                    lookupHit = hasProperty(context.view, name);
                }

                if (lookupHit)
                    break;

                context = context.parent;
            }

            cache[name] = value;
        }

        if (isFunction(value))
            value = value.call(this.view);

        return value;
    };

    /**
     * A Writer knows how to take a stream of tokens and render them to a
     * string, given a context. It also maintains a cache of templates to
     * avoid the need to parse the same template twice.
     */
    function Writer () {
        this.cache = {};
    }

    /**
     * Clears all cached templates in this writer.
     */
    Writer.prototype.clearCache = function clearCache () {
        this.cache = {};
    };

    /**
     * Parses and caches the given `template` and returns the array of tokens
     * that is generated from the parse.
     */
    Writer.prototype.parse = function parse (template, tags) {
        var cache = this.cache;
        var tokens = cache[template];

        if (tokens == null)
            tokens = cache[template + ':' + (tags || mustache.tags).join(':')] = parseTemplate(template, tags);

        return tokens;
    };

    /**
     * High-level method that is used to render the given `template` with
     * the given `view`.
     *
     * The optional `partials` argument may be an object that contains the
     * names and templates of partials that are used in the template. It may
     * also be a function that is used to load partial templates on the fly
     * that takes a single argument: the name of the partial.
     */
    Writer.prototype.render = function render (template, view, partials) {
        var tokens = this.parse(template);
        var context = (view instanceof Context) ? view : new Context(view);
        return this.renderTokens(tokens, context, partials, template);
    };

    /**
     * Low-level method that renders the given array of `tokens` using
     * the given `context` and `partials`.
     *
     * Note: The `originalTemplate` is only ever used to extract the portion
     * of the original template that was contained in a higher-order section.
     * If the template doesn't use higher-order sections, this argument may
     * be omitted.
     */
    Writer.prototype.renderTokens = function renderTokens (tokens, context, partials, originalTemplate) {
        var buffer = '';

        var token, symbol, value;
        for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) {
            value = undefined;
            token = tokens[i];
            symbol = token[0];

            if (symbol === '#') value = this.renderSection(token, context, partials, originalTemplate);
            else if (symbol === '^') value = this.renderInverted(token, context, partials, originalTemplate);
            else if (symbol === '>') value = this.renderPartial(token, context, partials, originalTemplate);
            else if (symbol === '&') value = this.unescapedValue(token, context);
            else if (symbol === 'name') value = this.escapedValue(token, context);
            else if (symbol === 'text') value = this.rawValue(token);

            if (value !== undefined)
                buffer += value;
        }

        return buffer;
    };

    Writer.prototype.renderSection = function renderSection (token, context, partials, originalTemplate) {
        var self = this;
        var buffer = '';
        var value = context.lookup(token[1]);

        // This function is used to render an arbitrary template
        // in the current context by higher-order sections.
        function subRender (template) {
            return self.render(template, context, partials);
        }

        if (!value) return;

        if (isArray(value)) {
            for (var j = 0, valueLength = value.length; j < valueLength; ++j) {
                buffer += this.renderTokens(token[4], context.push(value[j]), partials, originalTemplate);
            }
        } else if (typeof value === 'object' || typeof value === 'string' || typeof value === 'number') {
            buffer += this.renderTokens(token[4], context.push(value), partials, originalTemplate);
        } else if (isFunction(value)) {
            if (typeof originalTemplate !== 'string')
                throw new Error('Cannot use higher-order sections without the original template');

            // Extract the portion of the original template that the section contains.
            value = value.call(context.view, originalTemplate.slice(token[3], token[5]), subRender);

            if (value != null)
                buffer += value;
        } else {
            buffer += this.renderTokens(token[4], context, partials, originalTemplate);
        }
        return buffer;
    };

    Writer.prototype.renderInverted = function renderInverted (token, context, partials, originalTemplate) {
        var value = context.lookup(token[1]);

        // 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))
            return this.renderTokens(token[4], context, partials, originalTemplate);
    };

    Writer.prototype.renderPartial = function renderPartial (token, context, partials) {
        if (!partials) return;

        var value = isFunction(partials) ? partials(token[1]) : partials[token[1]];
        if (value != null)
            return this.renderTokens(this.parse(value), context, partials, value);
    };

    Writer.prototype.unescapedValue = function unescapedValue (token, context) {
        var value = context.lookup(token[1]);
        if (value != null)
            return value;
    };

    Writer.prototype.escapedValue = function escapedValue (token, context) {
        var value = context.lookup(token[1]);
        if (value != null)
            return mustache.escape(value);
    };

    Writer.prototype.rawValue = function rawValue (token) {
        return token[1];
    };

    mustache.name = 'mustache.js';
    mustache.version = '2.3.0';
    mustache.tags = [ '{{', '}}' ];

    // All high-level mustache.* functions use this writer.
    var defaultWriter = new Writer();

    /**
     * Clears all cached templates in the default writer.
     */
    mustache.clearCache = function clearCache () {
        return defaultWriter.clearCache();
    };

    /**
     * Parses and caches the given template in the default writer and returns the
     * array of tokens it contains. Doing this ahead of time avoids the need to
     * parse templates on the fly as they are rendered.
     */
    mustache.parse = function parse (template, tags) {
        return defaultWriter.parse(template, tags);
    };

    /**
     * Renders the `template` with the given `view` and `partials` using the
     * default writer.
     */
    mustache.render = function render (template, view, partials) {
        if (typeof template !== 'string') {
            throw new TypeError('Invalid template! Template should be a "string" ' +
                'but "' + typeStr(template) + '" was given as the first ' +
                'argument for mustache#render(template, view, partials)');
        }

        return defaultWriter.render(template, view, partials);
    };

    // This is here for backwards compatibility with 0.4.x.,
    /*eslint-disable */ // eslint wants camel cased function name
    mustache.to_html = function to_html (template, view, partials, send) {
        /*eslint-enable*/

        var result = mustache.render(template, view, partials);

        if (isFunction(send)) {
            send(result);
        } else {
            return result;
        }
    };

    // Export the escaping function so that the user may override it.
    // See https://github.com/janl/mustache.js/issues/244
    mustache.escape = escapeHtml;

    // Export these mainly for testing, but also for advanced usage.
    mustache.Scanner = Scanner;
    mustache.Context = Context;
    mustache.Writer = Writer;

    return mustache;
}));