source: trunk/www.guidonia.net/wp/wp-content/plugins/contact-form-7/modules/icl.php@ 44

<?php
/**
** ICL module for ICanLocalize translation service
**/

/* Shortcode handler */

function icl_wpcf7_shortcode_handler( $tag ) {

        if ( ! is_array( $tag ) )
                return '';

        $name = $tag['name'];
        $values = (array) $tag['values'];
        $content = $tag['content'];

        $content = trim( $content );
        if ( ! empty( $content ) ) {
                $string_name = icl_wpcf7_string_name( $content, $name );
                return icl_wpcf7_translate( $string_name, $content );
        }

        $value = trim( $values[0] );
        if ( ! empty( $value ) ) {
                $string_name = icl_wpcf7_string_name( $value, $name, 0 );
                return icl_wpcf7_translate( $string_name, $value );
        }

        return '';
}

wpcf7_add_shortcode( 'icl', 'icl_wpcf7_shortcode_handler', true );


/* Form tag filter */

function icl_wpcf7_form_tag_filter( $tag ) {
        if ( ! is_array( $tag ) )
                return $tag;

        $type = $tag['type'];
        $name = $tag['name'];
        $options = (array) $tag['options'];
        $values = (array) $tag['values'];
        $content = $tag['content'];

        $icl_option = array();
        foreach ( $options as $option ) {
                if ( 'icl' == $option ) {
                        $icl_option = array( 'icl', null );
                        break;
                } elseif ( preg_match( '/^icl:(.+)$/', $option, $matches ) ) {
                        $icl_option = array( 'icl', $matches[1] );
                        break;
                }
        }

        if ( ! ('icl' == $type || $icl_option ) )
                return $tag;

        $str_id = $icl_option[1] ? $icl_option[1] : $name;

        if ( ! empty( $values ) ) {
                $new_values = array();
                foreach ( $values as $key => $value ) {
                        $string_name = icl_wpcf7_string_name( $value, $str_id, $key );
                        $new_values[$key] = icl_wpcf7_translate( $string_name, $value );
                }

                if ( preg_match( '/^(?:text|email|textarea|captchar|submit)[*]?$/', $type ) )
                        $tag['values'] = $new_values;
                else
                        $tag['labels'] = $new_values;
        }

        $content = trim( $content );

        if ( ! empty( $content ) ) {
                $string_name = icl_wpcf7_string_name( $content, $str_id );
                $content = icl_wpcf7_translate( $string_name, $content );
                $tag['content'] = $content;
        }

        return $tag;
}

add_filter( 'wpcf7_form_tag', 'icl_wpcf7_form_tag_filter' );


/* Message dispaly filter */

function icl_wpcf7_display_message_filter( $message ) {
        $shortcode_manager = new WPCF7_ShortcodeManager();
        $shortcode_manager->add_shortcode( 'icl', 'icl_wpcf7_shortcode_handler', true );

        return $shortcode_manager->do_shortcode( $message );
}

add_filter( 'wpcf7_display_message', 'icl_wpcf7_display_message_filter' );


/* Collecting strings hook after saving */

function icl_wpcf7_collect_strings( &$contact_form ) {
        $scanned = $contact_form->form_scan_shortcode();

        foreach ( $scanned as $tag ) {
                if ( ! is_array( $tag ) )
                        continue;

                $type = $tag['type'];
                $name = $tag['name'];
                $options = (array) $tag['options'];
                $values = (array) $tag['values'];
                $content = $tag['content'];

                $icl_option = array();
                foreach ( $options as $option ) {
                        if ( 'icl' == $option ) {
                                $icl_option = array( 'icl', null );
                                break;
                        } elseif ( preg_match( '/^icl:(.+)$/', $option, $matches ) ) {
                                $icl_option = array( 'icl', $matches[1] );
                                break;
                        }
                }

                if ( ! ('icl' == $type || $icl_option ) )
                        continue;

                $str_id = $icl_option[1] ? $icl_option[1] : $name;

                if ( ! empty( $content ) ) {
                        $string_name = icl_wpcf7_string_name( $content, $str_id );
                        icl_wpcf7_register_string( $string_name, $content );

                } elseif ( ! empty( $values ) ) {
                        foreach ( $values as $key => $value ) {
                                $value = trim( $value );
                                $string_name = icl_wpcf7_string_name( $value, $str_id, $key );
                                icl_wpcf7_register_string( $string_name, $value );
                        }
                }
        }

        /* From messages */

        $messages = (array) $contact_form->messages;

        $shortcode_manager = new WPCF7_ShortcodeManager();
        $shortcode_manager->add_shortcode( 'icl', create_function( '$tag', 'return null;' ), true );

        foreach ( $messages as $message ) {
                $tags = $shortcode_manager->scan_shortcode( $message );
                foreach ( $tags as $tag ) {
                        $name = $tag['name'];
                        $values = (array) $tag['values'];
                        $content = trim( $tag['content'] );

                        if ( ! empty( $content ) ) {
                                $string_name = icl_wpcf7_string_name( $content, $name );
                                icl_wpcf7_register_string( $string_name, $content );

                        } else {
                                foreach ( $values as $key => $value ) {
                                        $value = trim( $value );
                                        $string_name = icl_wpcf7_string_name( $value, $name, $key );
                                        icl_wpcf7_register_string( $string_name, $value );
                                }
                        }
                }
        }
}

add_action( 'wpcf7_after_save', 'icl_wpcf7_collect_strings' );


/* Functions */

function icl_wpcf7_string_name( $value, $name = '', $key = '' ) {
        if ( ! empty( $name ) ) {
                $string_name = '@' . $name;
                if ( '' !== $key )
                        $string_name .= ' ' . $key;
        } else {
                $string_name = '#' . md5( $value );
        }

        return $string_name;
}

function icl_wpcf7_register_string( $name, $value ) {
        if ( ! function_exists( 'icl_register_string' ) )
                return false;

        $context = 'Contact Form 7';

        $value = trim( $value );
        if ( empty( $value ) )
                return false;

        icl_register_string( $context, $name, $value );
}

function icl_wpcf7_translate( $name, $value = '' ) {
        if ( ! function_exists( 'icl_t' ) )
                return $value;

        if ( empty( $name ) )
                return $value;

        $context = 'Contact Form 7';

        return icl_t( $context, $name, $value );
}

?>