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Diffstat (limited to 'lib/phptal/PHPTAL/Php/Attribute/I18N/Attributes.php')
-rw-r--r-- | lib/phptal/PHPTAL/Php/Attribute/I18N/Attributes.php | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/lib/phptal/PHPTAL/Php/Attribute/I18N/Attributes.php b/lib/phptal/PHPTAL/Php/Attribute/I18N/Attributes.php new file mode 100644 index 0000000..5eb3fac --- /dev/null +++ b/lib/phptal/PHPTAL/Php/Attribute/I18N/Attributes.php @@ -0,0 +1,118 @@ +<?php +/** + * PHPTAL templating engine + * + * PHP Version 5 + * + * @category HTML + * @package PHPTAL + * @author Laurent Bedubourg <lbedubourg@motion-twin.com> + * @author Kornel LesiĆski <kornel@aardvarkmedia.co.uk> + * @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License + * @version SVN: $Id$ + * @link http://phptal.org/ + */ + +/** + * i18n:attributes + * + * This attribute will allow us to translate attributes of HTML tags, such + * as the alt attribute in the img tag. The i18n:attributes attribute + * specifies a list of attributes to be translated with optional message + * IDs? for each; if multiple attribute names are given, they must be + * separated by semi-colons. Message IDs? used in this context must not + * include whitespace. + * + * Note that the value of the particular attributes come either from the + * HTML attribute value itself or from the data inserted by tal:attributes. + * + * If an attibute is to be both computed using tal:attributes and translated, + * the translation service is passed the result of the TALES expression for + * that attribute. + * + * An example: + * + * <img src="http://foo.com/logo" alt="Visit us" + * tal:attributes="alt here/greeting" + * i18n:attributes="alt" + * /> + * + * + * In this example, let tal:attributes set the value of the alt attribute to + * the text "Stop by for a visit!". This text will be passed to the + * translation service, which uses the result of language negotiation to + * translate "Stop by for a visit!" into the requested language. The example + * text in the template, "Visit us", will simply be discarded. + * + * Another example, with explicit message IDs: + * + * <img src="../icons/uparrow.png" alt="Up" + * i18n:attributes="src up-arrow-icon; alt up-arrow-alttext" + * > + * + * Here, the message ID up-arrow-icon will be used to generate the link to + * an icon image file, and the message ID up-arrow-alttext will be used for + * the "alt" text. + * + * + * + * @package PHPTAL + * @subpackage Php.attribute.i18n + */ +class PHPTAL_Php_Attribute_I18N_Attributes extends PHPTAL_Php_Attribute +{ + public function before(PHPTAL_Php_CodeWriter $codewriter) + { + // split attributes to translate + foreach ($codewriter->splitExpression($this->expression) as $exp) { + list($qname, $key) = $this->parseSetExpression($exp); + + // if the translation key is specified and not empty (but may be '0') + if (strlen($key)) { + // we use it and replace the tag attribute with the result of the translation + $code = $this->_getTranslationCode($codewriter, $key); + } else { + $attr = $this->phpelement->getAttributeNode($qname); + if (!$attr) throw new PHPTAL_TemplateException("Unable to translate attribute $qname, because there is no translation key specified", + $this->phpelement->getSourceFile(), $this->phpelement->getSourceLine()); + + if ($attr->getReplacedState() === PHPTAL_Dom_Attr::NOT_REPLACED) { + $code = $this->_getTranslationCode($codewriter, $attr->getValue()); + } elseif ($attr->getReplacedState() === PHPTAL_Dom_Attr::VALUE_REPLACED && $attr->getOverwrittenVariableName()) { + // sadly variables won't be interpolated in this translation + $code = 'echo '.$codewriter->escapeCode($codewriter->getTranslatorReference(). '->translate('.$attr->getOverwrittenVariableName().', false)'); + } else { + throw new PHPTAL_TemplateException("Unable to translate attribute $qname, because other TAL attributes are using it", + $this->phpelement->getSourceFile(), $this->phpelement->getSourceLine()); + } + } + $this->phpelement->getOrCreateAttributeNode($qname)->overwriteValueWithCode($code); + } + } + + public function after(PHPTAL_Php_CodeWriter $codewriter) + { + } + + /** + * @param key - unescaped string (not PHP code) for the key + */ + private function _getTranslationCode(PHPTAL_Php_CodeWriter $codewriter, $key) + { + $code = ''; + if (preg_match_all('/\$\{(.*?)\}/', $key, $m)) { + array_shift($m); + $m = array_shift($m); + foreach ($m as $name) { + $code .= "\n".$codewriter->getTranslatorReference(). '->setVar('.$codewriter->str($name).','.PHPTAL_Php_TalesInternal::compileToPHPExpression($name).');'; // allow more complex TAL expressions + } + $code .= "\n"; + } + + // notice the false boolean which indicate that the html is escaped + // elsewhere looks like an hack doesn't it ? :) + $code .= 'echo '.$codewriter->escapeCode($codewriter->getTranslatorReference().'->translate('.$codewriter->str($key).', false)'); + return $code; + } +} + |