YUI.add('template-base', function (Y, NAME) {

/**

Virtual rollup of the `template-base` and `template-micro` modules.

@module template

@main template

@since 3.8.0

**/

/**

Provides a generic API for using template engines such as Handlebars and

`Y.Template.Micro`.

@module template

@submodule template-base

@since 3.8.0

**/

/**

Provides a generic API for using template engines such as Handlebars and

`Y.Template.Micro`.

### Examples

Using with `Y.Template.Micro` (the default template engine):

    YUI().use('template', function (Y) {

        var micro = new Y.Template(),

            html  = micro.render('<%= data.message %>', {message: 'hello!'});

        // ...

    });

Using with Handlebars:

    YUI().use('template-base', 'handlebars', function (Y) {

        var handlebars = new Y.Template(Y.Handlebars),

            html       = handlebars.render('{{message}}', {message: 'hello!'});

        // ...

    });

@class Template

@param {Mixed} [engine=Y.Template.Micro] Template engine to use, such as

    `Y.Template.Micro` or `Y.Handlebars`. Defaults to `Y.Template.Micro` if not

    specified.

@param {Object} [defaults] Default options to use when instance methods are

    invoked.

@constructor

@since 3.8.0

**/

function Template(engine, defaults) {

    /**

    Default options.

    @property {Object} defaults

    @since 3.8.1

    **/

    this.defaults = defaults;

    /**

    Template engine class.

    @property {Mixed} engine

    @since 3.8.0

    **/

    this.engine = engine || Y.Template.Micro;

    if (!this.engine) {

        Y.error('No template engine loaded.');

    }

}

/**

Registry that maps template names to revived template functions.

@property _registry

@type Object

@static

@protected

@since 3.12.0

**/

Template._registry = {};

/**

Registers a pre-compiled template into the central template registry with a

given template string, allowing that template to be called and rendered by

that name using the `Y.Template.render()` static method.

For example, given the following simple Handlebars template, in `foo.hbs`:

@example

    <p>{{tagline}}</p>

It can be precompiled using the Handlebars CLI, and added into a YUI module

in the following way. Alternatively, `locator` can be used to automate this

process for you:

@example

    YUI.add('templates-foo', function (Y) {

        var engine = new Y.Template(Y.Handlebars),

            precompiled;

        precompiled = // Long precompiled template function here //

        Y.Template.register('foo', engine.revive(precompiled));

    }, '0.0.1', {requires: ['template-base', 'handlebars-base']});

See the `Y.Template#render` method to see how a registered template is used.

@method register

@param {String} templateName The template name.

@param {Function} template The function that returns the rendered string. The

    function should take the following parameters. If a pre-compiled template

    does not accept these parameters, it is up to the developer to normalize it.

  @param {Object} [template.data] Data object to provide when rendering the

    template.

  @param {Object} [template.options] Options to pass along to the template

    engine. See template engine docs for options supported by each engine.

@return {Function} revivedTemplate This is the same function as in `template`,

    and is done to maintain compatibility with the `Y.Template#revive()` method.

@static

@since 3.12.0

**/

Template.register = function (templateName, template) {

    Template._registry[templateName] = template;

    return template;

};

/**

Returns the registered template function, given the template name. If an

unregistered template is accessed, this will return `undefined`.

@method get

@param {String} templateName The template name.

@return {Function} revivedTemplate The revived template function, or `undefined`

    if it has not been registered.

@static

@since 3.12.0

**/

Template.get = function (templateName) {

    return Template._registry[templateName];

}

/**

Renders a template into a string, given the registered template name and data

to be interpolated. The template name must have been registered previously with

`register()`.

Once the template has been registered and built into a YUI module, it can be

listed as a dependency for any other YUI module. Continuing from the above

example, the registered template can be used in the following way:

@example

    YUI.add('bar', function (Y) {

        var html = Y.Template.render('foo', {

            tagline: '"bar" is now template language agnostic'

        });

    }, '0.0.1', {requires: ['template-base', 'templates-foo']});

The template can now be used without having to know which specific rendering

engine generated it.

@method render

@param {String} templateName The abstracted name to reference the template.

@param {Object} [data] The data to be interpolated into the template.

@param {Object} [options] Any additional options to be passed into the template.

@return {String} output The rendered result.

@static

@since 3.12.0

**/

Template.render = function (templateName, data, options) {

    var template = Template._registry[templateName],

        result   = '';

    if (template) {

        result = template(data, options);

    } else {

        Y.error('Unregistered template: "' + templateName + '"');

    }

    return result;

};

Template.prototype = {

    /**

    Compiles a template with the current template engine and returns a compiled

    template function.

    @method compile

    @param {String} text Template text to compile.

    @param {Object} [options] Options to pass along to the template engine. See

        template engine docs for options supported by each engine.

    @return {Function} Compiled template function.

    @since 3.8.0

    **/

    compile: function (text, options) {

        options = options ? Y.merge(this.defaults, options) : this.defaults;

        return this.engine.compile(text, options);

    },

    /**

    Precompiles a template with the current template engine and returns a string

    containing JavaScript source code for the precompiled template.

    @method precompile

    @param {String} text Template text to compile.

    @param {Object} [options] Options to pass along to the template engine. See

        template engine docs for options supported by each engine.

    @return {String} Source code for the precompiled template.

    @since 3.8.0

    **/

    precompile: function (text, options) {

        options = options ? Y.merge(this.defaults, options) : this.defaults;

        return this.engine.precompile(text, options);

    },

    /**

    Compiles and renders a template with the current template engine in a single

    step, and returns the rendered result.

    @method render

    @param {String} text Template text to render.

    @param {Object} data Data object to provide when rendering the template.

    @param {Object} [options] Options to pass along to the template engine. See

        template engine docs for options supported by each engine.

    @return {String} Rendered result.

    @since 3.8.0

    **/

    render: function (text, data, options) {

        options = options ? Y.merge(this.defaults, options) : this.defaults;

        if (this.engine.render) {

            return this.engine.render(text, data, options);

        }

        return this.engine.compile(text, options)(data, options);

    },

    /**

    Revives a precompiled template function into an executable template function

    using the current template engine. The precompiled code must already have

    been evaluated; this method won't evaluate it for you.

    @method revive

    @param {Function} precompiled Precompiled template function.

    @param {Object} [options] Options to pass along to the template engine. See

        template engine docs for options supported by each engine.

    @return {Function} Compiled template function.

    @since 3.8.0

    **/

    revive: function (precompiled, options) {

        options = options ? Y.merge(this.defaults, options) : this.defaults;

        return this.engine.revive ? this.engine.revive(precompiled, options) :

                precompiled;

    }

};

// Copy existing namespaced properties from Y.Template to the Template function

// if Y.Template already exists, then make the function the new Y.Template.

// This ensures that other modules can safely add stuff to the Y.Template

// namespace even if they're loaded before this one.

Y.Template = Y.Template ? Y.mix(Template, Y.Template) : Template;

}, '@VERSION@', {"requires": ["yui-base"]});