Message.php

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<?php
class Message {
    protected $interface = true;

    protected $language = null;

    protected $key;

    protected $parameters = array();

    protected $format = 'parse';

    protected $useDatabase = true;

    protected $title = null;

    protected $content = null;

    protected $message;

    public function __construct( $key, $params = array() ) {
        global $wgLang;
        $this->key = $key;
        $this->parameters = array_values( $params );
        $this->language = $wgLang;
    }

    public function getKey() {
        if ( is_array( $this->key ) ) {
            // May happen if some kind of fallback is applied.
            // For now, just use the first key. We really need a better solution.
            return $this->key[0];
        } else {
            return $this->key;
        }
    }

    public function getParams() {
        return $this->parameters;
    }

    public function getFormat() {
        return $this->format;
    }

    public static function newFromKey( $key /*...*/ ) {
        $params = func_get_args();
        array_shift( $params );
        return new self( $key, $params );
    }

    public static function newFallbackSequence( /*...*/ ) {
        $keys = func_get_args();
        if ( func_num_args() == 1 ) {
            if ( is_array( $keys[0] ) ) {
                // Allow an array to be passed as the first argument instead
                $keys = array_values( $keys[0] );
            } else {
                // Optimize a single string to not need special fallback handling
                $keys = $keys[0];
            }
        }
        return new self( $keys );
    }

    public function params( /*...*/ ) {
        $args = func_get_args();
        if ( isset( $args[0] ) && is_array( $args[0] ) ) {
            $args = $args[0];
        }
        $args_values = array_values( $args );
        $this->parameters = array_merge( $this->parameters, $args_values );
        return $this;
    }

    public function rawParams( /*...*/ ) {
        $params = func_get_args();
        if ( isset( $params[0] ) && is_array( $params[0] ) ) {
            $params = $params[0];
        }
        foreach ( $params as $param ) {
            $this->parameters[] = self::rawParam( $param );
        }
        return $this;
    }

    public function numParams( /*...*/ ) {
        $params = func_get_args();
        if ( isset( $params[0] ) && is_array( $params[0] ) ) {
            $params = $params[0];
        }
        foreach ( $params as $param ) {
            $this->parameters[] = self::numParam( $param );
        }
        return $this;
    }

    public function durationParams( /*...*/ ) {
        $params = func_get_args();
        if ( isset( $params[0] ) && is_array( $params[0] ) ) {
            $params = $params[0];
        }
        foreach ( $params as $param ) {
            $this->parameters[] = self::durationParam( $param );
        }
        return $this;
    }

    public function expiryParams( /*...*/ ) {
        $params = func_get_args();
        if ( isset( $params[0] ) && is_array( $params[0] ) ) {
            $params = $params[0];
        }
        foreach ( $params as $param ) {
            $this->parameters[] = self::expiryParam( $param );
        }
        return $this;
    }

    public function timeperiodParams( /*...*/ ) {
        $params = func_get_args();
        if ( isset( $params[0] ) && is_array( $params[0] ) ) {
            $params = $params[0];
        }
        foreach ( $params as $param ) {
            $this->parameters[] = self::timeperiodParam( $param );
        }
        return $this;
    }

    public function sizeParams( /*...*/ ) {
        $params = func_get_args();
        if ( isset( $params[0] ) && is_array( $params[0] ) ) {
            $params = $params[0];
        }
        foreach ( $params as $param ) {
            $this->parameters[] = self::sizeParam( $param );
        }
        return $this;
    }

    public function bitrateParams( /*...*/ ) {
        $params = func_get_args();
        if ( isset( $params[0] ) && is_array( $params[0] ) ) {
            $params = $params[0];
        }
        foreach ( $params as $param ) {
            $this->parameters[] = self::bitrateParam( $param );
        }
        return $this;
    }

    public function setContext( IContextSource $context ) {
        $this->inLanguage( $context->getLanguage() );
        $this->title( $context->getTitle() );
        $this->interface = true;

        return $this;
    }

    public function inLanguage( $lang ) {
        if ( $lang instanceof Language || $lang instanceof StubUserLang ) {
            $this->language = $lang;
        } elseif ( is_string( $lang ) ) {
            if ( $this->language->getCode() != $lang ) {
                $this->language = Language::factory( $lang );
            }
        } else {
            $type = gettype( $lang );
            throw new MWException( __METHOD__ . " must be "
                . "passed a String or Language object; $type given"
            );
        }
        $this->interface = false;
        return $this;
    }

    public function inContentLanguage() {
        global $wgForceUIMsgAsContentMsg;
        if ( in_array( $this->key, (array)$wgForceUIMsgAsContentMsg ) ) {
            return $this;
        }

        global $wgContLang;
        $this->interface = false;
        $this->language = $wgContLang;
        return $this;
    }

    public function setInterfaceMessageFlag( $value ) {
        $this->interface = (bool)$value;
        return $this;
    }

    public function useDatabase( $value ) {
        $this->useDatabase = (bool)$value;
        return $this;
    }

    public function title( $title ) {
        $this->title = $title;
        return $this;
    }

    public function content() {
        if ( !$this->content ) {
            $this->content = new MessageContent( $this );
        }

        return $this->content;
    }

    public function toString() {
        $string = $this->fetchMessage();

        if ( $string === false ) {
            $key = htmlspecialchars( is_array( $this->key ) ? $this->key[0] : $this->key );
            if ( $this->format === 'plain' ) {
                return '<' . $key . '>';
            }
            return '&lt;' . $key . '&gt;';
        }

        # Replace $* with a list of parameters for &uselang=qqx.
        if ( strpos( $string, '$*' ) !== false ) {
            $paramlist = '';
            if ( $this->parameters !== array() ) {
                $paramlist = ': $' . implode( ', $', range( 1, count( $this->parameters ) ) );
            }
            $string = str_replace( '$*', $paramlist, $string );
        }

        # Replace parameters before text parsing
        $string = $this->replaceParameters( $string, 'before' );

        # Maybe transform using the full parser
        if ( $this->format === 'parse' ) {
            $string = $this->parseText( $string );
            $m = array();
            if ( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $string, $m ) ) {
                $string = $m[1];
            }
        } elseif ( $this->format === 'block-parse' ) {
            $string = $this->parseText( $string );
        } elseif ( $this->format === 'text' ) {
            $string = $this->transformText( $string );
        } elseif ( $this->format === 'escaped' ) {
            $string = $this->transformText( $string );
            $string = htmlspecialchars( $string, ENT_QUOTES, 'UTF-8', false );
        }

        # Raw parameter replacement
        $string = $this->replaceParameters( $string, 'after' );

        return $string;
    }

    public function __toString() {
        // PHP doesn't allow __toString to throw exceptions and will
        // trigger a fatal error if it does. So, catch any exceptions.

        try {
            return $this->toString();
        } catch ( Exception $ex ) {
            try {
                trigger_error( "Exception caught in " . __METHOD__ . " (message " . $this->key . "): "
                    . $ex, E_USER_WARNING );
            } catch ( Exception $ex ) {
                // Doh! Cause a fatal error after all?
            }

            if ( $this->format === 'plain' ) {
                return '<' . $this->key . '>';
            }
            return '&lt;' . $this->key . '&gt;';
        }
    }

    public function parse() {
        $this->format = 'parse';
        return $this->toString();
    }

    public function text() {
        $this->format = 'text';
        return $this->toString();
    }

    public function plain() {
        $this->format = 'plain';
        return $this->toString();
    }

    public function parseAsBlock() {
        $this->format = 'block-parse';
        return $this->toString();
    }

    public function escaped() {
        $this->format = 'escaped';
        return $this->toString();
    }

    public function exists() {
        return $this->fetchMessage() !== false;
    }

    public function isBlank() {
        $message = $this->fetchMessage();
        return $message === false || $message === '';
    }

    public function isDisabled() {
        $message = $this->fetchMessage();
        return $message === false || $message === '' || $message === '-';
    }

    public static function rawParam( $value ) {
        return array( 'raw' => $value );
    }

    public static function numParam( $value ) {
        return array( 'num' => $value );
    }

    public static function durationParam( $value ) {
        return array( 'duration' => $value );
    }

    public static function expiryParam( $value ) {
        return array( 'expiry' => $value );
    }

    public static function timeperiodParam( $value ) {
        return array( 'period' => $value );
    }

    public static function sizeParam( $value ) {
        return array( 'size' => $value );
    }

    public static function bitrateParam( $value ) {
        return array( 'bitrate' => $value );
    }

    protected function replaceParameters( $message, $type = 'before' ) {
        $replacementKeys = array();
        foreach ( $this->parameters as $n => $param ) {
            list( $paramType, $value ) = $this->extractParam( $param );
            if ( $type === $paramType ) {
                $replacementKeys['$' . ( $n + 1 )] = $value;
            }
        }
        $message = strtr( $message, $replacementKeys );
        return $message;
    }

    protected function extractParam( $param ) {
        if ( is_array( $param ) ) {
            if ( isset( $param['raw'] ) ) {
                return array( 'after', $param['raw'] );
            } elseif ( isset( $param['num'] ) ) {
                // Replace number params always in before step for now.
                // No support for combined raw and num params
                return array( 'before', $this->language->formatNum( $param['num'] ) );
            } elseif ( isset( $param['duration'] ) ) {
                return array( 'before', $this->language->formatDuration( $param['duration'] ) );
            } elseif ( isset( $param['expiry'] ) ) {
                return array( 'before', $this->language->formatExpiry( $param['expiry'] ) );
            } elseif ( isset( $param['period'] ) ) {
                return array( 'before', $this->language->formatTimePeriod( $param['period'] ) );
            } elseif ( isset( $param['size'] ) ) {
                return array( 'before', $this->language->formatSize( $param['size'] ) );
            } elseif ( isset( $param['bitrate'] ) ) {
                return array( 'before', $this->language->formatBitrate( $param['bitrate'] ) );
            } else {
                trigger_error(
                    "Invalid message parameter: " . htmlspecialchars( serialize( $param ) ),
                    E_USER_WARNING
                );
                return array( 'before', '[INVALID]' );
            }
        } elseif ( $param instanceof Message ) {
            // Message objects should not be before parameters because
            // then they'll get double escaped. If the message needs to be
            // escaped, it'll happen right here when we call toString().
            return array( 'after', $param->toString() );
        } else {
            return array( 'before', $param );
        }
    }

    protected function parseText( $string ) {
        $out = MessageCache::singleton()->parse( $string, $this->title, /*linestart*/true, $this->interface, $this->language );
        return is_object( $out ) ? $out->getText() : $out;
    }

    protected function transformText( $string ) {
        return MessageCache::singleton()->transform( $string, $this->interface, $this->language, $this->title );
    }

    protected function fetchMessage() {
        if ( !isset( $this->message ) ) {
            $cache = MessageCache::singleton();
            if ( is_array( $this->key ) ) {
                if ( !count( $this->key ) ) {
                    throw new MWException( "Given empty message key array." );
                }
                foreach ( $this->key as $key ) {
                    $message = $cache->get( $key, $this->useDatabase, $this->language );
                    if ( $message !== false && $message !== '' ) {
                        break;
                    }
                }
                $this->message = $message;
            } else {
                $this->message = $cache->get( $this->key, $this->useDatabase, $this->language );
            }
        }
        return $this->message;
    }

}

class RawMessage extends Message {
    public function __construct( $key, $params = array() ) {
        parent::__construct( $key, $params );
        // The key is the message.
        $this->message = $key;
    }

    public function fetchMessage() {
        // Just in case the message is unset somewhere.
        if ( !isset( $this->message ) ) {
            $this->message = $this->key;
        }
        return $this->message;
    }
}