/files/nunjucks/1.0.0/nunjucks.js

// Browser bundle of nunjucks 1.0.0 

(function() {
var modules = {};
(function() {

// A simple class system, more documentation to come

function extend(cls, name, props) {
    // This does that same thing as Object.create, but with support for IE8
    var F = function() {};
    F.prototype = cls.prototype;
    var prototype = new F();

    var fnTest = /xyz/.test(function(){ xyz; }) ? /\bparent\b/ : /.*/;
    props = props || {};

    for(var k in props) {
        var src = props[k];
        var parent = prototype[k];

        if(typeof parent == "function" &&
           typeof src == "function" &&
           fnTest.test(src)) {
            prototype[k] = (function (src, parent) {
                return function() {
                    // Save the current parent method
                    var tmp = this.parent;

                    // Set parent to the previous method, call, and restore
                    this.parent = parent;
                    var res = src.apply(this, arguments);
                    this.parent = tmp;

                    return res;
                };
            })(src, parent);
        }
        else {
            prototype[k] = src;
        }
    }

    prototype.typename = name;

    var new_cls = function() { 
        if(prototype.init) {
            prototype.init.apply(this, arguments);
        }
    };

    new_cls.prototype = prototype;
    new_cls.prototype.constructor = new_cls;

    new_cls.extend = function(name, props) {
        if(typeof name == "object") {
            props = name;
            name = "anonymous";
        }
        return extend(new_cls, name, props);
    };

    return new_cls;
}

modules['object'] = extend(Object, "Object", {});
})();
(function() {
var ArrayProto = Array.prototype;
var ObjProto = Object.prototype;

var escapeMap = {
    '&': '&',
    '"': '"',
    "'": ''',
    "<": '&lt;',
    ">": '&gt;'
};

var lookupEscape = function(ch) {
    return escapeMap[ch];
};

var exports = modules['lib'] = {};

exports.withPrettyErrors = function(path, withInternals, func) {
    try {
        return func();
    } catch (e) {
        if (!e.Update) {
            // not one of ours, cast it
            e = new exports.TemplateError(e);
        }
        e.Update(path);

        // Unless they marked the dev flag, show them a trace from here
        if (!withInternals) {
            var old = e;
            e = new Error(old.message);
            e.name = old.name;
        }

        throw e;
    }
};

exports.TemplateError = function(message, lineno, colno) {
    var err = this;

    if (message instanceof Error) { // for casting regular js errors
        err = message;
        message = message.name + ": " + message.message;
    } else {
        if(Error.captureStackTrace) {
            Error.captureStackTrace(err);
        }
    }

    err.name = 'Template render error';
    err.message = message;
    err.lineno = lineno;
    err.colno = colno;
    err.firstUpdate = true;

    err.Update = function(path) {
        var message = "(" + (path || "unknown path") + ")";

        // only show lineno + colno next to path of template
        // where error occurred
        if (this.firstUpdate) {
            if(this.lineno && this.colno) {
                message += ' [Line ' + this.lineno + ', Column ' + this.colno + ']';
            }
            else if(this.lineno) {
                message += ' [Line ' + this.lineno + ']';
            }
        }

        message += '\n ';
        if (this.firstUpdate) {
            message += ' ';
        }

        this.message = message + (this.message || '');
        this.firstUpdate = false;
        return this;
    };

    return err;
};

exports.TemplateError.prototype = Error.prototype;

exports.escape = function(val) {
    return val.replace(/[&"'<>]/g, lookupEscape);
};

exports.isFunction = function(obj) {
    return ObjProto.toString.call(obj) == '[object Function]';
};

exports.isArray = Array.isArray || function(obj) {
    return ObjProto.toString.call(obj) == '[object Array]';
};

exports.isString = function(obj) {
    return ObjProto.toString.call(obj) == '[object String]';
};

exports.isObject = function(obj) {
    return obj === Object(obj);
};

exports.groupBy = function(obj, val) {
    var result = {};
    var iterator = exports.isFunction(val) ? val : function(obj) { return obj[val]; };
    for(var i=0; i<obj.length; i++) {
        var value = obj[i];
        var key = iterator(value, i);
        (result[key] || (result[key] = [])).push(value);
    }
    return result;
};

exports.toArray = function(obj) {
    return Array.prototype.slice.call(obj);
};

exports.without = function(array) {
    var result = [];
    if (!array) {
        return result;
    }
    var index = -1,
    length = array.length,
    contains = exports.toArray(arguments).slice(1);

    while(++index < length) {
        if(contains.indexOf(array[index]) === -1) {
            result.push(array[index]);
        }
    }
    return result;
};

exports.extend = function(obj, obj2) {
    for(var k in obj2) {
        obj[k] = obj2[k];
    }
    return obj;
};

exports.repeat = function(char_, n) {
    var str = '';
    for(var i=0; i<n; i++) {
        str += char_;
    }
    return str;
};

exports.each = function(obj, func, context) {
    if(obj == null) {
        return;
    }

    if(ArrayProto.each && obj.each == ArrayProto.each) {
        obj.forEach(func, context);
    }
    else if(obj.length === +obj.length) {
        for(var i=0, l=obj.length; i<l; i++) {
            func.call(context, obj[i], i, obj);
        }
    }
};

exports.map = function(obj, func) {
    var results = [];
    if(obj == null) {
        return results;
    }

    if(ArrayProto.map && obj.map === ArrayProto.map) {
        return obj.map(func);
    }

    for(var i=0; i<obj.length; i++) {
        results[results.length] = func(obj[i], i);
    }

    if(obj.length === +obj.length) {
        results.length = obj.length;
    }

    return results;
};

exports.asyncParallel = function(funcs, done) {
    var count = funcs.length,
        result = new Array(count),
        current = 0;

    var makeNext = function(i) {
        return function(res) {
            result[i] = res;
            current += 1;

            if (current === count) {
                done(result);
            }
        };
    };

    for (var i = 0; i < count; i++) {
        funcs[i](makeNext(i));
    }
};

exports.asyncIter = function(arr, iter, cb) {
    var i = -1;
    
    function next() {
        i++;

        if(i < arr.length) {
            iter(arr[i], i, next, cb);
        }
        else {
            cb();
        }
    }

    next();
};

exports.asyncFor = function(obj, iter, cb) {
    var keys = exports.keys(obj);
    var len = keys.length;
    var i = -1;

    function next() {
        i++;
        var k = keys[i];

        if(i < len) {
            iter(k, obj[k], i, len, next);
        }
        else {
            cb();
        }
    }

    next();
};

if(!Array.prototype.indexOf) {
    Array.prototype.indexOf = function(array, searchElement /*, fromIndex */) {
        if (array == null) {
            throw new TypeError();
        }
        var t = Object(array);
        var len = t.length >>> 0;
        if (len === 0) {
            return -1;
        }
        var n = 0;
        if (arguments.length > 2) {
            n = Number(arguments[2]);
            if (n != n) { // shortcut for verifying if it's NaN
                n = 0;
            } else if (n != 0 && n != Infinity && n != -Infinity) {
                n = (n > 0 || -1) * Math.floor(Math.abs(n));
            }
        }
        if (n >= len) {
            return -1;
        }
        var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
        for (; k < len; k++) {
            if (k in t && t[k] === searchElement) {
                return k;
            }
        }
        return -1;
    };
}

if(!Array.prototype.map) {
    Array.prototype.map = function() {
        throw new Error("map is unimplemented for this js engine");
    };
}

exports.keys = function(obj) {
    if(Object.prototype.keys) {
        return obj.keys();
    }
    else {
        var keys = [];
        for(var k in obj) {
            if(obj.hasOwnProperty(k)) {
                keys.push(k);
            }
        }
        return keys;
    }
}
})();
(function() {
var util = modules["util"];
var lib = modules["lib"];
var Object = modules["object"];

function traverseAndCheck(obj, type, results) {
    if(obj instanceof type) {
        results.push(obj);
    }

    if(obj instanceof Node) {
        obj.findAll(type, results);
    }
}

var Node = Object.extend("Node", {
    init: function(lineno, colno) {
        this.lineno = lineno;
        this.colno = colno;

        var fields = this.fields;
        for(var i=0, l=fields.length; i<l; i++) {
            var field = fields[i];

            // The first two args are line/col numbers, so offset by 2
            var val = arguments[i + 2];

            // Fields should never be undefined, but null. It makes
            // testing easier to normalize values.
            if(val === undefined) {
                val = null;
            }

            this[field] = val;
        }
    },

    findAll: function(type, results) {
        results = results || [];

        if(this instanceof NodeList) {
            var children = this.children;

            for(var i=0, l=children.length; i<l; i++) {
                traverseAndCheck(children[i], type, results);
            }
        }
        else {
            var fields = this.fields;

            for(var i=0, l=fields.length; i<l; i++) {
                traverseAndCheck(this[fields[i]], type, results);
            }
        }

        return results;
    },

    iterFields: function(func) {
        lib.each(this.fields, function(field) {
            func(this[field], field);
        }, this);
    }
});

// Abstract nodes
var Value = Node.extend("Value", { fields: ['value'] });

// Concrete nodes
var NodeList = Node.extend("NodeList", {
    fields: ['children'],

    init: function(lineno, colno, nodes) {
        this.parent(lineno, colno, nodes || []);
    },

    addChild: function(node) {
        this.children.push(node);
    }
});

var Root = NodeList.extend("Root");
var Literal = Value.extend("Literal");
var Symbol = Value.extend("Symbol");
var Group = NodeList.extend("Group");
var Array = NodeList.extend("Array");
var Pair = Node.extend("Pair", { fields: ['key', 'value'] });
var Dict = NodeList.extend("Dict");
var LookupVal = Node.extend("LookupVal", { fields: ['target', 'val'] });
var If = Node.extend("If", { fields: ['cond', 'body', 'else_'] });
var IfAsync = If.extend("IfAsync");
var InlineIf = Node.extend("InlineIf", { fields: ['cond', 'body', 'else_'] });
var For = Node.extend("For", { fields: ['arr', 'name', 'body'] });
var AsyncEach = For.extend("AsyncEach");
var AsyncAll = For.extend("AsyncAll");
var Macro = Node.extend("Macro", { fields: ['name', 'args', 'body'] });
var Import = Node.extend("Import", { fields: ['template', 'target'] });
var FromImport = Node.extend("FromImport", {
    fields: ['template', 'names'],

    init: function(lineno, colno, template, names) {
        this.parent(lineno, colno,
                    template,
                    names || new NodeList());
    }
});
var FunCall = Node.extend("FunCall", { fields: ['name', 'args'] });
var Filter = FunCall.extend("Filter");
var FilterAsync = Filter.extend("FilterAsync", {
    fields: ['name', 'args', 'symbol']
});
var KeywordArgs = Dict.extend("KeywordArgs");
var Block = Node.extend("Block", { fields: ['name', 'body'] });
var Super = Node.extend("Super", { fields: ['blockName', 'symbol'] });
var TemplateRef = Node.extend("TemplateRef", { fields: ['template'] });
var Extends = TemplateRef.extend("Extends");
var Include = TemplateRef.extend("Include");
var Set = Node.extend("Set", { fields: ['targets', 'value'] });
var Output = NodeList.extend("Output");
var TemplateData = Literal.extend("TemplateData");
var UnaryOp = Node.extend("UnaryOp", { fields: ['target'] });
var BinOp = Node.extend("BinOp", { fields: ['left', 'right'] });
var Or = BinOp.extend("Or");
var And = BinOp.extend("And");
var Not = UnaryOp.extend("Not");
var Add = BinOp.extend("Add");
var Sub = BinOp.extend("Sub");
var Mul = BinOp.extend("Mul");
var Div = BinOp.extend("Div");
var FloorDiv = BinOp.extend("FloorDiv");
var Mod = BinOp.extend("Mod");
var Pow = BinOp.extend("Pow");
var Neg = UnaryOp.extend("Neg");
var Pos = UnaryOp.extend("Pos");
var Compare = Node.extend("Compare", { fields: ['expr', 'ops'] });
var CompareOperand = Node.extend("CompareOperand", {
    fields: ['expr', 'type']
});

var CustomTag = Node.extend("CustomTag", {
    init: function(lineno, colno, name) {
        this.lineno = lineno;
        this.colno = colno;
        this.name = name;
    }
});

var CallExtension = Node.extend("CallExtension", {
    fields: ['extName', 'prop', 'args', 'contentArgs'],

    init: function(ext, prop, args, contentArgs) {
        this.extName = ext._name || ext;
        this.prop = prop;
        this.args = args || new NodeList();
        this.contentArgs = contentArgs || [];
    }
});

var CallExtensionAsync = CallExtension.extend("CallExtensionAsync");

// Print the AST in a nicely formatted tree format for debuggin
function printNodes(node, indent) {
    indent = indent || 0;

    // This is hacky, but this is just a debugging function anyway
    function print(str, indent, inline) {
        var lines = str.split("\n");

        for(var i=0; i<lines.length; i++) {
            if(lines[i]) {
                if((inline && i > 0) || !inline) {
                    for(var j=0; j<indent; j++) {
                        util.print(" ");
                    }
                }
            }

            if(i === lines.length-1) {
                util.print(lines[i]);
            }
            else {
                util.puts(lines[i]);
            }
        }
    }

    print(node.typename + ": ", indent);

    if(node instanceof NodeList) {
        print('\n');
        lib.each(node.children, function(n) {
            printNodes(n, indent + 2);
        });
    }
    else if(node instanceof CallExtension) {
        print(node.extName + '.' + node.prop);
        print('\n');

        if(node.args) {
            printNodes(node.args, indent + 2);
        }

        if(node.contentArgs) {
            lib.each(node.contentArgs, function(n) {
                printNodes(n, indent + 2);
            });
        }
    }
    else {
        var nodes = null;
        var props = null;

        node.iterFields(function(val, field) {
            if(val instanceof Node) {
                nodes = nodes || {};
                nodes[field] = val;
            }
            else {
                props = props || {};
                props[field] = val;
            }
        });

        if(props) {
            print(util.inspect(props, true, null) + '\n', null, true);
        }
        else {
            print('\n');
        }

        if(nodes) {
            for(var k in nodes) {
                printNodes(nodes[k], indent + 2);
            }
        }

    }
}

// var t = new NodeList(0, 0,
//                      [new Value(0, 0, 3),
//                       new Value(0, 0, 10),
//                       new Pair(0, 0,
//                                new Value(0, 0, 'key'),
//                                new Value(0, 0, 'value'))]);
// printNodes(t);

modules['nodes'] = {
    Node: Node,
    Root: Root,
    NodeList: NodeList,
    Value: Value,
    Literal: Literal,
    Symbol: Symbol,
    Group: Group,
    Array: Array,
    Pair: Pair,
    Dict: Dict,
    Output: Output,
    TemplateData: TemplateData,
    If: If,
    IfAsync: IfAsync,
    InlineIf: InlineIf,
    For: For,
    AsyncEach: AsyncEach,
    AsyncAll: AsyncAll,
    Macro: Macro,
    Import: Import,
    FromImport: FromImport,
    FunCall: FunCall,
    Filter: Filter,
    FilterAsync: FilterAsync,
    KeywordArgs: KeywordArgs,
    Block: Block,
    Super: Super,
    Extends: Extends,
    Include: Include,
    Set: Set,
    LookupVal: LookupVal,
    BinOp: BinOp,
    Or: Or,
    And: And,
    Not: Not,
    Add: Add,
    Sub: Sub,
    Mul: Mul,
    Div: Div,
    FloorDiv: FloorDiv,
    Mod: Mod,
    Pow: Pow,
    Neg: Neg,
    Pos: Pos,
    Compare: Compare,
    CompareOperand: CompareOperand,

    CallExtension: CallExtension,
    CallExtensionAsync: CallExtensionAsync,

    printNodes: printNodes
};
})();
(function() {

var lib = modules["lib"];
var Object = modules["object"];

// Frames keep track of scoping both at compile-time and run-time so
// we know how to access variables. Block tags can introduce special
// variables, for example.
var Frame = Object.extend({
    init: function(parent) {
        this.variables = {};
        this.parent = parent;
    },

    set: function(name, val) {
        // Allow variables with dots by automatically creating the
        // nested structure
        var parts = name.split('.');
        var obj = this.variables;

        for(var i=0; i<parts.length - 1; i++) {
            var id = parts[i];

            if(!obj[id]) {
                obj[id] = {};
            }
            obj = obj[id];
        }

        obj[parts[parts.length - 1]] = val;
    },

    get: function(name) {
        var val = this.variables[name];
        if(val !== undefined && val !== null) {
            return val;
        }
        return null;
    },

    lookup: function(name) {
        var p = this.parent;
        var val = this.variables[name];
        if(val !== undefined && val !== null) {
            return val;
        }
        return p && p.lookup(name);
    },

    push: function() {
        return new Frame(this);
    },

    pop: function() {
        return this.parent;
    }
});

function makeMacro(argNames, kwargNames, func) {
    return function() {
        var argCount = numArgs(arguments);
        var args;
        var kwargs = getKeywordArgs(arguments);

        if(argCount > argNames.length) {
            args = Array.prototype.slice.call(arguments, 0, argNames.length);

            // Positional arguments that should be passed in as
            // keyword arguments (essentially default values)
            var vals = Array.prototype.slice.call(arguments, args.length, argCount);
            for(var i=0; i<vals.length; i++) {
                if(i < kwargNames.length) {
                    kwargs[kwargNames[i]] = vals[i];
                }
            }

            args.push(kwargs);
        }
        else if(argCount < argNames.length) {
            args = Array.prototype.slice.call(arguments, 0, argCount);

            for(var i=argCount; i<argNames.length; i++) {
                var arg = argNames[i];

                // Keyword arguments that should be passed as
                // positional arguments, i.e. the caller explicitly
                // used the name of a positional arg
                args.push(kwargs[arg]);
                delete kwargs[arg];
            }

            args.push(kwargs);
        }
        else {
            args = arguments;
        }

        return func.apply(this, args);
    };
}

function makeKeywordArgs(obj) {
    obj.__keywords = true;
    return obj;
}

function getKeywordArgs(args) {
    var len = args.length;
    if(len) {
        var lastArg = args[len - 1];
        if(lastArg && lastArg.hasOwnProperty('__keywords')) {
            return lastArg;
        }
    }
    return {};
}

function numArgs(args) {
    var len = args.length;
    if(len === 0) {
        return 0;
    }

    var lastArg = args[len - 1];
    if(lastArg && lastArg.hasOwnProperty('__keywords')) {
        return len - 1;
    }
    else {
        return len;
    }
}

// A SafeString object indicates that the string should not be
// autoescaped. This happens magically because autoescaping only
// occurs on primitive string objects.
function SafeString(val) {
    if(typeof val != 'string') {
        return val;
    }

    this.toString = function() {
        return val;
    };

    this.length = val.length;

    var methods = [
        'charAt', 'charCodeAt', 'concat', 'contains',
        'endsWith', 'fromCharCode', 'indexOf', 'lastIndexOf',
        'length', 'localeCompare', 'match', 'quote', 'replace',
        'search', 'slice', 'split', 'startsWith', 'substr',
        'substring', 'toLocaleLowerCase', 'toLocaleUpperCase',
        'toLowerCase', 'toUpperCase', 'trim', 'trimLeft', 'trimRight'
    ];

    for(var i=0; i<methods.length; i++) {
        this[methods[i]] = markSafe(val[methods[i]]);
    }
}

function copySafeness(dest, target) {
    if(dest instanceof SafeString) {
        return new SafeString(target);
    }
    return target.toString();
}

function markSafe(val) {
    var type = typeof val;

    if(type === 'string') {
        return new SafeString(val);
    }
    else if(type !== 'function') {
        return val;
    }
    else {
        return function() {
            var ret = val.apply(this, arguments);

            if(typeof ret === 'string') {
                return new SafeString(ret);
            }

            return ret;
        };
    }
}

function suppressValue(val, autoescape) {
    val = (val !== undefined && val !== null) ? val : "";

    if(autoescape && typeof val === "string") {
        val = lib.escape(val);
    }

    return val;
}

function memberLookup(obj, val) {
    obj = obj || {};

    if(typeof obj[val] === 'function') {
        return function() {
            return obj[val].apply(obj, arguments);
        };
    }

    return obj[val];
}

function callWrap(obj, name, args) {
    if(!obj) {
        throw new Error('Unable to call `' + name + '`, which is undefined or falsey');
    }
    else if(typeof obj !== 'function') {
        throw new Error('Unable to call `' + name + '`, which is not a function');
    }

    return obj.apply(this, args);
}

function contextOrFrameLookup(context, frame, name) {
    var val = frame.lookup(name);
    return (val !== undefined && val !== null) ?
        val :
        context.lookup(name);
}

function handleError(error, lineno, colno) {
    if(error.lineno) {
        return error;
    }
    else {
        return new lib.TemplateError(error, lineno, colno);
    }
}

function asyncEach(arr, dimen, iter, cb) {
    if(lib.isArray(arr)) {
        var len = arr.length;

        lib.asyncIter(arr, function(item, i, next) {
            switch(dimen) {
            case 1: iter(item, i, len, next); break;
            case 2: iter(item[0], item[1], i, len, next); break;
            case 3: iter(item[0], item[1], item[2], i, len, next); break;
            default:
                item.push(i, next);
                iter.apply(this, item);
            }
        }, cb);
    }
    else {
        lib.asyncFor(arr, function(key, val, i, len, next) {
            iter(key, val, i, len, next);
        }, cb);
    }
}

function asyncAll(arr, dimen, func, cb) {
    var finished = 0;
    var len;
    var outputArr;

    function done(i, output) {
        finished++;
        outputArr[i] = output;

        if(finished == len) {
            cb(null, outputArr.join(''));
        }
    }

    if(lib.isArray(arr)) {
        len = arr.length;
        outputArr = new Array(len);

        if(len == 0) {
            cb(null, '');
        }
        else {
            for(var i=0; i<arr.length; i++) {
                var item = arr[i];

                switch(dimen) {
                case 1: func(item, i, len, done); break;
                case 2: func(item[0], item[1], i, len, done); break;
                case 3: func(item[0], item[1], item[2], i, len, done); break;
                default:
                    item.push(i, done);
                    func.apply(this, item);
                }
            }
        }
    }
    else {
        var keys = lib.keys(arr);
        len = keys.length;
        outputArr = new Array(len);

        if(len == 0) {
            cb(null, '');
        }
        else {
            for(var i=0; i<keys.length; i++) {
                var k = keys[i];
                func(k, arr[k], i, len, done);
            }
        }
    }
}

modules['runtime'] = {
    Frame: Frame,
    makeMacro: makeMacro,
    makeKeywordArgs: makeKeywordArgs,
    numArgs: numArgs,
    suppressValue: suppressValue,
    memberLookup: memberLookup,
    contextOrFrameLookup: contextOrFrameLookup,
    callWrap: callWrap,
    handleError: handleError,
    isArray: lib.isArray,
    asyncEach: lib.asyncEach,
    keys: lib.keys,
    SafeString: SafeString,
    copySafeness: copySafeness,
    markSafe: markSafe,
    asyncEach: asyncEach,
    asyncAll: asyncAll
};
})();
(function() {
var lib = modules["lib"];

var whitespaceChars = " \n\t\r";
var delimChars = "()[]{}%*-+/#,:|.<>=!";
var intChars = "0123456789";

var BLOCK_START = "{%";
var BLOCK_END = "%}";
var VARIABLE_START = "{{";
var VARIABLE_END = "}}";
var COMMENT_START = "{#";
var COMMENT_END = "#}";

var TOKEN_STRING = "string";
var TOKEN_WHITESPACE = "whitespace";
var TOKEN_DATA = "data";
var TOKEN_BLOCK_START = "block-start";
var TOKEN_BLOCK_END = "block-end";
var TOKEN_VARIABLE_START = "variable-start";
var TOKEN_VARIABLE_END = "variable-end";
var TOKEN_COMMENT = "comment";
var TOKEN_LEFT_PAREN = "left-paren";
var TOKEN_RIGHT_PAREN = "right-paren";
var TOKEN_LEFT_BRACKET = "left-bracket";
var TOKEN_RIGHT_BRACKET = "right-bracket";
var TOKEN_LEFT_CURLY = "left-curly";
var TOKEN_RIGHT_CURLY = "right-curly";
var TOKEN_OPERATOR = "operator";
var TOKEN_COMMA = "comma";
var TOKEN_COLON = "colon";
var TOKEN_PIPE = "pipe";
var TOKEN_INT = "int";
var TOKEN_FLOAT = "float";
var TOKEN_BOOLEAN = "boolean";
var TOKEN_SYMBOL = "symbol";
var TOKEN_SPECIAL = "special";

function token(type, value, lineno, colno) {
    return {
        type: type,
        value: value,
        lineno: lineno,
        colno: colno
    };
}

function Tokenizer(str) {
    this.str = str;
    this.index = 0;
    this.len = str.length;
    this.lineno = 0;
    this.colno = 0;

    this.in_code = false;
}

Tokenizer.prototype.nextToken = function() {
    var lineno = this.lineno;
    var colno = this.colno;

    if(this.in_code) {
        // Otherwise, if we are in a block parse it as code
        var cur = this.current();
        var tok;

        if(this.is_finished()) {
            // We have nothing else to parse
            return null;
        }
        else if(cur == "\"" || cur == "'") {
            // We've hit a string
            return token(TOKEN_STRING, this.parseString(cur), lineno, colno);
        }
        else if((tok = this._extract(whitespaceChars))) {
            // We hit some whitespace
            return token(TOKEN_WHITESPACE, tok, lineno, colno);
        }
        else if((tok = this._extractString(BLOCK_END)) ||
                (tok = this._extractString('-' + BLOCK_END))) {
            // Special check for the block end tag
            //
            // It is a requirement that start and end tags are composed of
            // delimiter characters (%{}[] etc), and our code always
            // breaks on delimiters so we can assume the token parsing
            // doesn't consume these elsewhere
            this.in_code = false;
            return token(TOKEN_BLOCK_END, tok, lineno, colno);
        }
        else if((tok = this._extractString(VARIABLE_END))) {
            // Special check for variable end tag (see above)
            this.in_code = false;
            return token(TOKEN_VARIABLE_END, tok, lineno, colno);
        }
        else if(delimChars.indexOf(cur) != -1) {
            // We've hit a delimiter (a special char like a bracket)
            this.forward();
            var complexOps = ['==', '!=', '<=', '>=', '//', '**'];
            var curComplex = cur + this.current();
            var type;

            if(complexOps.indexOf(curComplex) !== -1) {
                this.forward();
                cur = curComplex;
            }

            switch(cur) {
            case "(": type = TOKEN_LEFT_PAREN; break;
            case ")": type = TOKEN_RIGHT_PAREN; break;
            case "[": type = TOKEN_LEFT_BRACKET; break;
            case "]": type = TOKEN_RIGHT_BRACKET; break;
            case "{": type = TOKEN_LEFT_CURLY; break;
            case "}": type = TOKEN_RIGHT_CURLY; break;
            case ",": type = TOKEN_COMMA; break;
            case ":": type = TOKEN_COLON; break;
            case "|": type = TOKEN_PIPE; break;
            default: type = TOKEN_OPERATOR;
            }

            return token(type, cur, lineno, colno);
        }
        else {
            // We are not at whitespace or a delimiter, so extract the
            // text and parse it
            tok = this._extractUntil(whitespaceChars + delimChars);

            if(tok.match(/^[-+]?[0-9]+$/)) {
                if(this.current() == '.') {
                    this.forward();
                    var dec = this._extract(intChars);
                    return token(TOKEN_FLOAT, tok + '.' + dec, lineno, colno);
                }
                else {
                    return token(TOKEN_INT, tok, lineno, colno);
                }
            }
            else if(tok.match(/^(true|false)$/)) {
                return token(TOKEN_BOOLEAN, tok, lineno, colno);
            }
            else if(tok) {
                return token(TOKEN_SYMBOL, tok, lineno, colno);
            }
            else {
                throw new Error("Unexpected value while parsing: " + tok);
            }
        }
    }
    else {
        // Parse out the template text, breaking on tag
        // delimiters because we need to look for block/variable start
        // tags (don't use the full delimChars for optimization)
        var beginChars = (BLOCK_START.charAt(0) +
                          VARIABLE_START.charAt(0) +
                          COMMENT_START.charAt(0) +
                          COMMENT_END.charAt(0));
        var tok;

        if(this.is_finished()) {
            return null;
        }
        else if((tok = this._extractString(BLOCK_START + '-')) ||
                (tok = this._extractString(BLOCK_START))) {
            this.in_code = true;
            return token(TOKEN_BLOCK_START, tok, lineno, colno);
        }
        else if((tok = this._extractString(VARIABLE_START))) {
            this.in_code = true;
            return token(TOKEN_VARIABLE_START, tok, lineno, colno);
        }
        else {
            tok = '';
            var data;
            var in_comment = false;

            if(this._matches(COMMENT_START)) {
                in_comment = true;
                tok = this._extractString(COMMENT_START);
            }

            // Continually consume text, breaking on the tag delimiter
            // characters and checking to see if it's a start tag.
            //
            // We could hit the end of the template in the middle of
            // our looping, so check for the null return value from
            // _extractUntil
            while((data = this._extractUntil(beginChars)) !== null) {
                tok += data;

                if((this._matches(BLOCK_START) ||
                    this._matches(VARIABLE_START) ||
                    this._matches(COMMENT_START)) &&
                  !in_comment) {
                    // If it is a start tag, stop looping
                    break;
                }
                else if(this._matches(COMMENT_END)) {
                    if(!in_comment) {
                        throw new Error("unexpected end of comment");
                    }
                    tok += this._extractString(COMMENT_END);
                    break;
                }
                else {
                    // It does not match any tag, so add the character and
                    // carry on
                    tok += this.current();
                    this.forward();
                }
            }

            if(data === null && in_comment) {
                throw new Error("expected end of comment, got end of file");
            }

            return token(in_comment ? TOKEN_COMMENT : TOKEN_DATA,
                         tok,
                         lineno,
                         colno);
        }
    }

    throw new Error("Could not parse text");
};

Tokenizer.prototype.parseString = function(delimiter) {
    this.forward();

    var lineno = this.lineno;
    var colno = this.colno;
    var str = "";

    while(!this.is_finished() && this.current() != delimiter) {
        var cur = this.current();

        if(cur == "\\") {
            this.forward();
            switch(this.current()) {
            case "n": str += "\n"; break;
            case "t": str += "\t"; break;
            case "r": str += "\r"; break;
            default:
                str += this.current();
            }
            this.forward();
        }
        else {
            str += cur;
            this.forward();
        }
    }

    this.forward();
    return str;
};

Tokenizer.prototype._matches = function(str) {
    if(this.index + str.length > this.length) {
        return null;
    }

    var m = this.str.slice(this.index, this.index + str.length);
    return m == str;
};

Tokenizer.prototype._extractString = function(str) {
    if(this._matches(str)) {
        this.index += str.length;
        return str;
    }
    return null;
};

Tokenizer.prototype._extractUntil = function(charString) {
    // Extract all non-matching chars, with the default matching set
    // to everything
    return this._extractMatching(true, charString || "");
};

Tokenizer.prototype._extract = function(charString) {
    // Extract all matching chars (no default, so charString must be
    // explicit)
    return this._extractMatching(false, charString);
};

Tokenizer.prototype._extractMatching = function (breakOnMatch, charString) {
    // Pull out characters until a breaking char is hit.
    // If breakOnMatch is false, a non-matching char stops it.
    // If breakOnMatch is true, a matching char stops it.

    if(this.is_finished()) {
        return null;
    }

    var first = charString.indexOf(this.current());

    // Only proceed if the first character doesn't meet our condition
    if((breakOnMatch && first == -1) ||
       (!breakOnMatch && first != -1)) {
        var t = this.current();
        this.forward();

        // And pull out all the chars one at a time until we hit a
        // breaking char
        var idx = charString.indexOf(this.current());

        while(((breakOnMatch && idx == -1) ||
               (!breakOnMatch && idx != -1)) && !this.is_finished()) {
            t += this.current();
            this.forward();

            idx = charString.indexOf(this.current());
        }

        return t;
    }

    return "";
};

Tokenizer.prototype.is_finished = function() {
    return this.index >= this.len;
};

Tokenizer.prototype.forwardN = function(n) {
    for(var i=0; i<n; i++) {
        this.forward();
    }
};

Tokenizer.prototype.forward = function() {
    this.index++;

    if(this.previous() == "\n") {
        this.lineno++;
        this.colno = 0;
    }
    else {
        this.colno++;
    }
};

Tokenizer.prototype.backN = function(n) {
    for(var i=0; i<n; i++) {
        self.back();
    }
};

Tokenizer.prototype.back = function() {
    this.index--;

    if(this.current() == "\n") {
        this.lineno--;

        var idx = this.src.lastIndexOf("\n", this.index-1);
        if(idx == -1) {
            this.colno = this.index;
        }
        else {
            this.colno = this.index - idx;
        }
    }
    else {
        this.colno--;
    }
};

Tokenizer.prototype.current = function() {
    if(!this.is_finished()) {
        return this.str.charAt(this.index);
    }
    return "";
};

Tokenizer.prototype.previous = function() {
    return this.str.charAt(this.index-1);
};

modules['lexer'] = {
    lex: function(src) {
        return new Tokenizer(src);
    },

    setTags: function(tags) {
        BLOCK_START = tags.blockStart || BLOCK_START;
        BLOCK_END = tags.blockEnd || BLOCK_END;
        VARIABLE_START = tags.variableStart || VARIABLE_START;
        VARIABLE_END = tags.variableEnd || VARIABLE_END;
        COMMENT_START = tags.commentStart || COMMENT_START;
        COMMENT_END = tags.commentEnd || COMMENT_END;
    },

    TOKEN_STRING: TOKEN_STRING,
    TOKEN_WHITESPACE: TOKEN_WHITESPACE,
    TOKEN_DATA: TOKEN_DATA,
    TOKEN_BLOCK_START: TOKEN_BLOCK_START,
    TOKEN_BLOCK_END: TOKEN_BLOCK_END,
    TOKEN_VARIABLE_START: TOKEN_VARIABLE_START,
    TOKEN_VARIABLE_END: TOKEN_VARIABLE_END,
    TOKEN_COMMENT: TOKEN_COMMENT,
    TOKEN_LEFT_PAREN: TOKEN_LEFT_PAREN,
    TOKEN_RIGHT_PAREN: TOKEN_RIGHT_PAREN,
    TOKEN_LEFT_BRACKET: TOKEN_LEFT_BRACKET,
    TOKEN_RIGHT_BRACKET: TOKEN_RIGHT_BRACKET,
    TOKEN_LEFT_CURLY: TOKEN_LEFT_CURLY,
    TOKEN_RIGHT_CURLY: TOKEN_RIGHT_CURLY,
    TOKEN_OPERATOR: TOKEN_OPERATOR,
    TOKEN_COMMA: TOKEN_COMMA,
    TOKEN_COLON: TOKEN_COLON,
    TOKEN_PIPE: TOKEN_PIPE,
    TOKEN_INT: TOKEN_INT,
    TOKEN_FLOAT: TOKEN_FLOAT,
    TOKEN_BOOLEAN: TOKEN_BOOLEAN,
    TOKEN_SYMBOL: TOKEN_SYMBOL,
    TOKEN_SPECIAL: TOKEN_SPECIAL
};
})();
(function() {
var lexer = modules["lexer"];
var nodes = modules["nodes"];
var Object = modules["object"];
var lib = modules["lib"];

var Parser = Object.extend({
    init: function (tokens) {
        this.tokens = tokens;
        this.peeked = null;
        this.breakOnBlocks = null;
        this.dropLeadingWhitespace = false;

        this.extensions = [];
    },

    nextToken: function (withWhitespace) {
        var tok;

        if(this.peeked) {
            if(!withWhitespace && this.peeked.type == lexer.TOKEN_WHITESPACE) {
                this.peeked = null;
            }
            else {
                tok = this.peeked;
                this.peeked = null;
                return tok;
            }
        }

        tok = this.tokens.nextToken();

        if(!withWhitespace) {
            while(tok && tok.type == lexer.TOKEN_WHITESPACE) {
                tok = this.tokens.nextToken();
            }
        }

        return tok;
    },

    peekToken: function () {
        this.peeked = this.peeked || this.nextToken();
        return this.peeked;
    },

    pushToken: function(tok) {
        if(this.peeked) {
            throw new Error("pushToken: can only push one token on between reads");
        }
        this.peeked = tok;
    },

    fail: function (msg, lineno, colno) {
        if((lineno === undefined || colno === undefined) && this.peekToken()) {
            var tok = this.peekToken();
            lineno = tok.lineno;
            colno = tok.colno;
        }
        if (lineno !== undefined) lineno += 1;
        if (colno !== undefined) colno += 1;

        throw new lib.TemplateError(msg, lineno, colno);
    },

    skip: function(type) {
        var tok = this.nextToken();
        if(!tok || tok.type != type) {
            this.pushToken(tok);
            return false;
        }
        return true;
    },

    expect: function(type) {
        var tok = this.nextToken();
        if(!tok.type == type) {
            this.fail('expected ' + type + ', got ' + tok.type,
                      tok.lineno,
                      tok.colno);
        }
        return tok;
    },

    skipValue: function(type, val) {
        var tok = this.nextToken();
        if(!tok || tok.type != type || tok.value != val) {
            this.pushToken(tok);
            return false;
        }
        return true;
    },

    skipWhitespace: function () {
        return this.skip(lexer.TOKEN_WHITESPACE);
    },

    skipSymbol: function(val) {
        return this.skipValue(lexer.TOKEN_SYMBOL, val);
    },

    advanceAfterBlockEnd: function(name) {
        if(!name) {
            var tok = this.peekToken();

            if(!tok) {
                this.fail('unexpected end of file');
            }

            if(tok.type != lexer.TOKEN_SYMBOL) {
                this.fail("advanceAfterBlockEnd: expected symbol token or " +
                          "explicit name to be passed");
            }

            name = this.nextToken().value;
        }

        var tok = this.nextToken();

        if(tok && tok.type == lexer.TOKEN_BLOCK_END) {
            if(tok.value.charAt(0) === '-') {
                this.dropLeadingWhitespace = true;
            }
        }
        else {
            this.fail("expected block end in " + name + " statement");
        }
    },

    advanceAfterVariableEnd: function() {
        if(!this.skip(lexer.TOKEN_VARIABLE_END)) {
            this.fail("expected variable end");
        }
    },

    parseFor: function() {
        var forTok = this.peekToken();
        var node;
        var endBlock;

        if(this.skipSymbol('for')) {
            node = new nodes.For(forTok.lineno, forTok.colno);
            endBlock = 'endfor';
        }
        else if(this.skipSymbol('asyncEach')) {
            node = new nodes.AsyncEach(forTok.lineno, forTok.colno);
            endBlock = 'endeach';
        }
        else if(this.skipSymbol('asyncAll')) {
            node = new nodes.AsyncAll(forTok.lineno, forTok.colno);
            endBlock = 'endall';
        }
        else {
            this.fail("parseFor: expected for{Async}", forTok.lineno, forTok.colno);
        }

        node.name = this.parsePrimary();

        if(!(node.name instanceof nodes.Symbol)) {
            this.fail('parseFor: variable name expected for loop');
        }

        var type = this.peekToken().type;
        if(type == lexer.TOKEN_COMMA) {
            // key/value iteration
            var key = node.name;
            node.name = new nodes.Array(key.lineno, key.colno);
            node.name.addChild(key);

            while(this.skip(lexer.TOKEN_COMMA)) {
                var prim = this.parsePrimary();
                node.name.addChild(prim);
            }
        }

        if(!this.skipSymbol('in')) {
            this.fail('parseFor: expected "in" keyword for loop',
                      forTok.lineno,
                      forTok.colno);
        }

        node.arr = this.parseExpression();
        this.advanceAfterBlockEnd(forTok.value);

        node.body = this.parseUntilBlocks(endBlock);
        this.advanceAfterBlockEnd();

        return node;
    },

    parseMacro: function() {
        var macroTok = this.peekToken();
        if(!this.skipSymbol('macro')) {
            this.fail("expected macro");
        }

        var name = this.parsePrimary(true);
        var args = this.parseSignature();
        var node = new nodes.Macro(macroTok.lineno,
                                   macroTok.colno,
                                   name,
                                   args);

        this.advanceAfterBlockEnd(macroTok.value);
        node.body = this.parseUntilBlocks('endmacro');
        this.advanceAfterBlockEnd();

        return node;
    },

    parseImport: function() {
        var importTok = this.peekToken();
        if(!this.skipSymbol('import')) {
            this.fail("parseImport: expected import",
                      importTok.lineno,
                      importTok.colno);
        }

        var template = this.parsePrimary();

        if(!this.skipSymbol('as')) {
            this.fail('parseImport: expected "as" keyword',
                            importTok.lineno,
                            importTok.colno);
        }

        var target = this.parsePrimary();
        var node = new nodes.Import(importTok.lineno,
                                    importTok.colno,
                                    template,
                                    target);
        this.advanceAfterBlockEnd(importTok.value);

        return node;
    },

    parseFrom: function() {
        var fromTok = this.peekToken();
        if(!this.skipSymbol('from')) {
            this.fail("parseFrom: expected from");
        }

        var template = this.parsePrimary();
        var node = new nodes.FromImport(fromTok.lineno,
                                        fromTok.colno,
                                        template,
                                        new nodes.NodeList());

        if(!this.skipSymbol('import')) {
            this.fail("parseFrom: expected import",
                            fromTok.lineno,
                            fromTok.colno);
        }

        var names = node.names;

        while(1) {
            var nextTok = this.peekToken();
            if(nextTok.type == lexer.TOKEN_BLOCK_END) {
                if(!names.children.length) {
                    this.fail('parseFrom: Expected at least one import name',
                              fromTok.lineno,
                              fromTok.colno);
                }

                // Since we are manually advancing past the block end,
                // need to keep track of whitespace control (normally
                // this is done in `advanceAfterBlockEnd`
                if(nextTok.value.charAt(0) == '-') {
                    this.dropLeadingWhitespace = true;
                }

                this.nextToken();
                break;
            }

            if(names.children.length > 0 && !this.skip(lexer.TOKEN_COMMA)) {
                this.fail('parseFrom: expected comma',
                                fromTok.lineno,
                                fromTok.colno);
            }

            var name = this.parsePrimary();
            if(name.value.charAt(0) == '_') {
                this.fail('parseFrom: names starting with an underscore ' +
                          'cannot be imported',
                          name.lineno,
                          name.colno);
            }

            if(this.skipSymbol('as')) {
                var alias = this.parsePrimary();
                names.addChild(new nodes.Pair(name.lineno,
                                              name.colno,
                                              name,
                                              alias));
            }
            else {
                names.addChild(name);
            }
        }

        return node;
    },

    parseBlock: function() {
        var tag = this.peekToken();
        if(!this.skipSymbol('block')) {
            this.fail('parseBlock: expected block', tag.lineno, tag.colno);
        }

        var node = new nodes.Block(tag.lineno, tag.colno);

        node.name = this.parsePrimary();
        if(!(node.name instanceof nodes.Symbol)) {
            this.fail('parseBlock: variable name expected',
                      tag.lineno,
                      tag.colno);
        }

        this.advanceAfterBlockEnd(tag.value);

        node.body = this.parseUntilBlocks('endblock');

        if(!this.peekToken()) {
            this.fail('parseBlock: expected endblock, got end of file');
        }

        this.advanceAfterBlockEnd();

        return node;
    },

    parseTemplateRef: function(tagName, nodeType) {
        var tag = this.peekToken();
        if(!this.skipSymbol(tagName)) {
            this.fail('parseTemplateRef: expected '+ tagName);
        }

        var node = new nodeType(tag.lineno, tag.colno);
        node.template = this.parsePrimary();

        this.advanceAfterBlockEnd(tag.value);
        return node;
    },

    parseExtends: function() {
        return this.parseTemplateRef('extends', nodes.Extends);
    },

    parseInclude: function() {
        return this.parseTemplateRef('include', nodes.Include);
    },

    parseIf: function() {
        var tag = this.peekToken();
        var node;

        if(this.skipSymbol('if') || this.skipSymbol('elif')) {
            node = new nodes.If(tag.lineno, tag.colno);
        }
        else if(this.skipSymbol('ifAsync')) {
            node = new nodes.IfAsync(tag.lineno, tag.colno);
        }
        else {
            this.fail("parseIf: expected if or elif",
                      tag.lineno,
                      tag.colno);
        }

        node.cond = this.parseExpression();
        this.advanceAfterBlockEnd(tag.value);

        node.body = this.parseUntilBlocks('elif', 'else', 'endif');
        var tok = this.peekToken();

        switch(tok && tok.value) {
        case "elif":
            node.else_ = this.parseIf();
            break;
        case "else":
            this.advanceAfterBlockEnd();
            node.else_ = this.parseUntilBlocks("endif");
            this.advanceAfterBlockEnd();
            break;
        case "endif":
            node.else_ = null;
            this.advanceAfterBlockEnd();
            break;
        default:
            this.fail('parseIf: expected endif, else, or endif, ' +
                      'got end of file');
        }

        return node;
    },

    parseSet: function() {
        var tag = this.peekToken();
        if(!this.skipSymbol('set')) {
            this.fail('parseSet: expected set', tag.lineno, tag.colno);
        }

        var node = new nodes.Set(tag.lineno, tag.colno, []);

        var target;
        while((target = this.parsePrimary())) {
            node.targets.push(target);

            if(!this.skip(lexer.TOKEN_COMMA)) {
                break;
            }
        }

        if(!this.skipValue(lexer.TOKEN_OPERATOR, '=')) {
            this.fail('parseSet: expected = in set tag',
                      tag.lineno,
                      tag.colno);
        }

        node.value = this.parseExpression();
        this.advanceAfterBlockEnd(tag.value);

        return node;
    },

    parseStatement: function () {
        var tok = this.peekToken();
        var node;

        if(tok.type != lexer.TOKEN_SYMBOL) {
            this.fail('tag name expected', tok.lineno, tok.colno);
        }

        if(this.breakOnBlocks &&
           this.breakOnBlocks.indexOf(tok.value) !== -1) {
            return null;
        }

        switch(tok.value) {