Template library

To install, run:

haxelib install thx.tpl 0.2.1 

See using Haxelib in Haxelib documentation for more information.


Build Status

Based on erazor, thx.tpl tries to get the syntax closer to Haxe string interpolation.

basic usage

A template interpolates variables and control structures expressed as markup inside a string.

var template = new Template("Hello $name");
trace(template.execute(['name' => 'Boris']));
// "Hello Boris"

The syntax for simple string interpolation is the same as the native Haxe syntax. If you have a complex expression you can put it into brackets to ensure that values are referred correctly.

new Template("Hello ${}");

thx.tpl is smarter and will interpolate correctly any expression that resembles a valid Haxe expression.

The following and the previous example are equivalent.

new Template("Hello $");

Again, use the curly braces if there is potential ambiguity.

new Template("Hello ${name}.done.");

The same general rule applies to other expressions as well like function calls.

new Template("Hello $person.displayLongName()");

When you work with thx.tpl you are always in one of two possible scopes: literal scope and expression scope. You generally start with the literal scope ("Hello " in the above example) and you switch to expression scope using the $. Expression scopes can create sub-literal scopes like in the case of if or loop statements.

new Template("$if(cond) { $(/* expression scope */)
  this is just a string literal $(/* literal scope */)
} else { $(/* expression scope */)
  and this is an alternative $(/* literal scope */)
} // expression scope")

Sometimes you need to define new variables or put some kind of computation that doesn't generate a direct output. To do so you embed your code in $(). It can be multiline. This is the way we added comments in the snippet before.

new Template("$(
  var numberOfEmails = person.contacts.emails.length;

Inside code blocks you have to remember to close your statements with ; as you would normally do in Haxe.

thx.tpl supports the following control statements:

$if(condtion) { }
$if(condtion) { } else { }
$for(item in iterator) { }
$for(i in 0...10) { }
$while(condition) { }

To escape a $ sign just repeat it twice.

new Template("$${some}"); // will always generate `${some}`

runtime templates

All the examples above are examples of runtime templates. The template string representation is parsed at runtime when the template is constructed and applied to an input using template.execute(data).

Runtime templates use hscript for the code logic.

Beside passing data to execute you can also setup utility functions and variables using the addHelper method of a Template instance.

var template = new Template("$upperCaseFirst(name)");
    return values.substring(0, 1).toUpperCase() + values.substring(1))

html templates

An instance of HtmlTemplate works almost exactly the same as an instance of Template. The only major difference is that values generated in HtmlTemplate are automatically sanitized to prevent HTML injection. If you still want to output the raw value you can use the helper function raw that is automatically available inside the template.

load templates at compile time

If you have static files containing the template definitions, you can easily load them using StaticResource from thx.core

class Main {
  public static function main() {
    // `Resources.sample` matches a file like `test/templates/sample.html`
    var template = new HtmlTemplate(Resources.sample);
    var output = template.execute(["title" => "Page Title", "content" => "Page Content"]);

@:dir("test/templates") // this directory contains `sample.html`
class Resources implements thx.StaticResource {}

Note that StaticResource will load any file in test/templates and assign its content to a member of Resources. The member name will match the file name minus the extension. The name is also transformed so that it remains compatible with allowed Haxe variable name identifiers. If your resource folder contains two file with names that are identical after normalization, an error will be thrown.

Also StaticResource tries to load the assets with the right semantic and tries to parse contents for files that end in json or yaml (if the yaml lib is installed). Anything else will be parsed as String.


haxelib install git src
1 year ago

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