Information

TwigExtensionsBundle is just a collection of Twig extensions i find useful.

A live demo with code examples can be found at http://craue.de/sf2playground/en/CraueTwigExtensions/.

This bundle should be used in conjunction with Symfony2.

DecorateEmptyValueExtension

Provides an enhanced default filter, craue_default, to decorate empty values with a placeholder which can even be HTML.

Usually, if you want to use HTML, e.g. the HTML entity "—", as value for the default filter in an HTML Twig template you have to do cumbersome

{{ somevalue | e | default('—') | raw }}

to make it render properly. With this extension you can write

{{ somevalue | craue_default }}

instead.

ArrayHelperExtension

Provides the filters

• craue_without wrapping PHP's array_diff function,
• craue_replaceKey which adds/replaces an array entry (whereupon the key can be a variable), and
• craue_translateArray which translates all entries in an array.

FormExtension

Provides a mechanism to render a form several times on one page. This is done by cloning the form prior to rendering using the craue_cloneForm function.

It also provides the craue_hasFormDeepErrors function to check if a form (while taking into account all of its children) has any errors.

StringHelperExtension

Provides the craue_substr function wrapping PHP's substr function. (As of Twig 1.6, there's a slice filter you should use instead.)

Also provides the craue_trailingDot filter for ensuring that a text ends with a dot. This comes in handy when using error messages (e.g. for validation) of vendor bundles (which are written like sentences but are missing the trailing dots) together with your own ones (which should include the trailing dot).

FormatDateTimeExtension

Provides the filters craue_date, craue_time, and craue_datetime for locale-aware formatting of date, time, and date/time values.

FormatNumberExtension

Provides the filters craue_number, craue_currency, and craue_spellout for locale-aware formatting of numbers and currencies.

ChangeLanguageExtension

Provides helpers (function craue_languageName, global craue_availableLocales) and templates for implementing a language change mechanism.

Installation

Add TwigExtensionsBundle to your vendor directory

Either by using a Git submodule:

git submodule add https://github.com/craue/TwigExtensionsBundle.git vendor/bundles/Craue/TwigExtensionsBundle

Or by using the deps file:

[CraueTwigExtensionsBundle]
git=https://github.com/craue/TwigExtensionsBundle.git
target=bundles/Craue/TwigExtensionsBundle

Add TwigExtensionsBundle to your application kernel

// app/AppKernel.php
public function registerBundles() {
	$bundles = array(
		// ...
		new Craue\TwigExtensionsBundle\CraueTwigExtensionsBundle(),
	);
	// ...
}

Register the Craue namespace

// app/autoload.php
$loader->registerNamespaces(array(
	// ...
	'Craue' => __DIR__.'/../vendor/bundles',
));

Make the Twig extensions available by updating your configuration

// app/config/config.yml
craue_twig_extensions: ~

Examples to use the extensions in your Twig template

DecorateEmptyValueExtension

{{ someValueWhichMayBeEmpty | craue_default }}<br />
{{ someValueWhichMayBeEmpty | craue_default('no value') }}<br />
{{ someValueWhichMayBeEmpty | craue_default('&ndash;') }}<br />
{{ someValueWhichMayBeEmpty | craue_default(0) }}

ArrayHelperExtension

{{ anArray | craue_without(aValueOrAnArray) | join(', ') }}<br />
{{ ['red', 'green', 'yellow', 'blue'] | craue_without('yellow') | join(', ') }} will print "red, green, blue"<br />
{{ ['red', 'green', 'yellow', 'blue'] | craue_without(['yellow', 'black', 'red']) | join(', ') }} will print "green, blue"

{{ anArray | craue_replaceKey(key, value) | join(', ') }}<br />
{% set newKey = 'key3' %}
{{ {'key1': 'value1', 'key2': 'value2'} | craue_replaceKey(newKey, 'value3') | join(', ') }} will print "value1, value2, value3"

{{ anArray | craue_translateArray() | join(', ') }}<br />

FormExtension

{% for myEntity in myEntities %}
	{% set myFormInstance = craue_cloneForm(myForm) %}
	<form action={{ path('my_route', {'id': myEntity.getId()}) }} method="post" {{ form_enctype(myFormInstance) }}>
		{{ form_widget(myFormInstance) }}
		<input type="submit" />
	</form>
{% endfor %}

StringHelperExtension

{{ craue_substr('bla', 2) }} will print "a"<br />
{{ craue_substr('bla', 0, 1) }} will print "b"<br />
{{ craue_substr('bla', 1, 1) }} will print "l"<br />
{{ craue_substr('bla', 1, 2) }} will print "la"

{{ aString | craue_trailingDot }}<br />
{{ 'This text should end with a dot' | craue_trailingDot }}<br />
{{ 'This text should end with exactly one dot.' | craue_trailingDot }}

FormatDateTimeExtension

<h2>with the current locale</h2>
date: {{ someDateTimeValue | craue_date }}<br />
time: {{ someDateTimeValue | craue_time }}<br />
both: {{ someDateTimeValue | craue_datetime }}

<h2>with a specific locale</h2>
date: {{ someDateTimeValue | craue_date('de-DE') }}<br />
time: {{ someDateTimeValue | craue_time('de') }}<br />
both: {{ someDateTimeValue | craue_datetime('en-GB') }}

FormatNumberExtension

<h2>with the current locale</h2>
thousands separator: {{ someNumber | craue_number }}<br />
default currency: {{ someNumber | craue_currency }}<br />
specific currency: {{ someNumber | craue_currency('EUR') }}<br />
spelled out number: {{ someNumber | craue_spellout }}

<h2>with a specific locale</h2>
thousands separator: {{ someNumber | craue_number('de-DE') }}<br />
default currency: {{ someNumber | craue_currency(null, 'de-DE') }}<br />
specific currency: {{ someNumber | craue_currency('EUR', 'de-DE') }}<br />
spelled out number: {{ someNumber | craue_spellout('de-DE') }}

ChangeLanguageExtension

There's a Twig template provided which you can use to render a "change language" menu like this:

{% include 'CraueTwigExtensionsBundle:ChangeLanguage:changeLanguage.html.twig' %}

This will render a list of links to the current route in all defined languages. Wrap it in a div to style it via CSS. Take a look at the template if you want to customize it.

Set/override default values

DecorateEmptyValueExtension

; app/config/parameters.ini
craue_twig_extensions.decorateEmptyValue.placeholder="–"

FormatDateTimeExtension

; app/config/parameters.ini
craue_twig_extensions.formatDateTime.datetype="full"
craue_twig_extensions.formatDateTime.timetype="short"

FormatNumberExtension

; app/config/parameters.ini
craue_twig_extensions.formatNumber.currency="EUR"

ChangeLanguageExtension

; app/config/parameters.ini
craue_twig_extensions.changeLanguage.availableLocales[]="de"
craue_twig_extensions.changeLanguage.availableLocales[]="en"
craue_twig_extensions.changeLanguage.availableLocales[]="ru"
craue_twig_extensions.changeLanguage.showForeignLanguageNames=true
craue_twig_extensions.changeLanguage.showFirstUppercase=false

With XML for example you can also set the keys to be more specific about the locales:

<parameter key="craue_twig_extensions.changeLanguage.availableLocales" type="collection">
	<parameter key="de_DE">de</parameter>
	<parameter key="en">en</parameter>
	<parameter key="ru">ru</parameter>
</parameter>

Advanced stuff

Aliases

Optionally, you can define aliases for all provided filters/functions/globals to be used within your project. This allows you to use names you prefer instead of the pre-defined ones. E.g., if you don't like to write

{{ somevalue | craue_default }}

all the time, you may define an alias of "d" for the craue_default filter which allows you to write

{{ somevalue | d }}

in your Twig templates. But pay attention to not accidentally override built-in filters/functions/globals, although you can do it intentionally.

DecorateEmptyValueExtension

; app/config/parameters.ini
craue_twig_extensions.decorateEmptyValue.filterAlias="d"

ArrayHelperExtension

; app/config/parameters.ini
craue_twig_extensions.arrayHelper.withoutAlias="without"
craue_twig_extensions.arrayHelper.replaceKeyAlias="replaceKey"
craue_twig_extensions.arrayHelper.translateArrayAlias="translateArray"

FormExtension

; app/config/parameters.ini
craue_twig_extensions.form.cloneFormAlias="cloneForm"

StringHelperExtension

; app/config/parameters.ini
craue_twig_extensions.stringHelper.substrAlias="substr"
craue_twig_extensions.stringHelper.trailingDotAlias="trailingDot"

FormatDateTimeExtension

; app/config/parameters.ini
craue_twig_extensions.formatDateTime.dateFilterAlias="date"
craue_twig_extensions.formatDateTime.timeFilterAlias="time"
craue_twig_extensions.formatDateTime.dateTimeFilterAlias="datetime"

FormatNumberExtension

; app/config/parameters.ini
craue_twig_extensions.formatNumber.numberFilterAlias="number"
craue_twig_extensions.formatNumber.currencyFilterAlias="currency"
craue_twig_extensions.formatNumber.spelloutFilterAlias="spellout"

ChangeLanguageExtension

; app/config/parameters.ini
craue_twig_extensions.changeLanguage.languageNameAlias="languageName"
craue_twig_extensions.changeLanguage.availableLocalesAlias="availableLocales"

Enabling only specific extensions

By default, all provided extensions are enabled. If you're using only one or some of them, you may want to disable the others. The following enables them all, so remove the ones you don't need:

// app/config.yml
craue_twig_extensions:
  enable_only:
    - ArrayHelperExtension
    - ChangeLanguageExtension
    - DecorateEmptyValueExtension
    - FormatDateTimeExtension
    - FormatNumberExtension
    - FormExtension
    - StringHelperExtension