Mustache templates for Haxe

This is a Haxe implementation of logic-less mustache templating.

Originally ported from mustache.js.

Status: works fine, passes tests and should be safe to use. Travis-tested on all Haxe targets (except the new Lua one). Internal structure and API may change a little, but not much.

Try online!

Usage

Here's a quick example:

class Main {
    static function main() {
        var template = "Hello {{name}}, how are you?";
        var context = {name: "World"};
        var output = Mustache.render(template, context);
        trace(output); // Hello World, how are you?
    }
}

See mustache(5) for the actual template language description, here we'll only document extensions and API specifics.

API

The main entry point is the Mustache.render function and it's defined like this:

public static function render(template:String, context:mustache.Context, ?partials:mustache.Partials):String;

The template argument is obviously the template itself. It will be parsed to an AST and cached across calls.

The context is the root context for template variables. You can pass any object and its fields will be looked up using reflection. If field is a function, it will be called without arguments on lookup to return a value to render. If the object passed is instance of haxe.ds.StringMap it contents will be accessed via get call rather than reflection. For an advanced usage, you can manually create new mustache.Context(yourData).

The partials (optional) is where partial templates are stored (used by {{>name}} and {{<name}}...{{/name}} tags). It can either be an object with string fields or a lookup function with String->String signature.

Falsy values

Mustache uses concept of falsy values for e.g. determining if section should be rendered or not. Here's what hxmustache considers falsy:

null
false
0 and 0.0
empty String
empty Array

These values will make {{#name}} sections NOT render, and {{^name}} DO render. If used as {{value}}s, they won't be rendered in any way.

All other values are considered truthy.

Functions

If the value of a section is a function, it will be called with 2 arguments:

part of template inside the section
rendering function (String->String)

...and is expected to return rendered string. Example:

class Main {
    static function main() {
        var context = {
            "name": "Tater",
            "bold": function() { // this function will be called when looking up `bold`
                return function(text, render) { // this function will be called for rendering a section
                    return "<b>" + render(text) + "</b>";
                }
            }
        };
        var template = "{{#bold}}Hi {{name}}.{{/bold}}";
        var output = Mustache.render(template, context);
        trace(output); // <b>Hi Tater.</b>
    }
}

Additional features

Template inheritance

hxmustache implements the popular template inheritance proposal. Example:

class Main {
    static function main() {
        var layout = "
        <head>
            <title>{{$title}}Default title{{/title}}</title>
        </head>
        <body>
            <div id='content'>
            {{$content}}{{/content}}
            </div>
        </body>";

        var template = "
        {{<layout}}
            {{$title}}{{name}}{{/title}}
            {{$content}}
                Hello, {{name}}!
            {{/content}}
        {{/layout}}";

        var context = {name: "Dan"};

        var partials = {"layout": layout};
        var output = Mustache.render(template, context, partials);

        trace(output);
        /*
            <head>
                <title>Dan</title>
            </head>
            <body>
                <div id='content'>
                    Hello, Dan!
                </div>
            </body>
        */
    }
}

Command-line interface

hxmustache can be used as a command-line tool. Examples:

Output to stdout:

haxelib run hxmustache view.json template.mustache

Output to output.html:

haxelib run hxmustache view.json template.mustache output.html

Add partial templates:

haxelib run hxmustache view.json template.mustache -p mypartial.mustache -p myotherpartial.mustache

Partials will be available by the name of the partial template file without directory and extension (e.g. layout for templates/layout.mustache).

nadako / hxmustache