InsertablesAid.php

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<?php
class InsertablesAid extends TranslationAid {
    public function getData() {

        // We need to get the primary group to get the correct file
        // So $group can be different from $this->group
        $group = $this->handle->getGroup();

        // This was added later, so not all classes have it. In addition
        // the message group class hierarche doesn't lend itself easily
        // to the user of interfaces for this purpose.
        if ( !method_exists( $group, 'getInsertablesSuggester' ) ) {
            throw new TranslationHelperException( "Group does not have a suggester" );
        }

        $suggester = $group->getInsertablesSuggester();

        // It is okay to return null suggester
        if ( !$suggester ) {
            throw new TranslationHelperException( "Group does not have a suggester" );
        }

        $insertables = $suggester->getInsertables( $this->getDefinition() );
        $blob = array();
        foreach ( $insertables as $insertable ) {
            $displayText = $insertable->getDisplayText();

            // The keys are used for de-duplication
            $blob[$displayText] = array(
                'display' => $displayText,
                'pre' => $insertable->getPreText(),
                'post' => $insertable->getPostText(),
            );
        }

        $blob = array_values( $blob );
        $blob['**'] = 'insertable';

        return $blob;
    }
}