mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/SyntaxHighlight_GeSHi
synced 2024-11-16 02:55:50 +00:00
9d69259b13
We could do this using TextContent::fillParserOutput(), but alas it is 'protected', so we have to duplicate a tiny bit of code from there. Bug: 68757 Change-Id: I7d98fa0f97fb195d23caa3d7448a15c3bbe430ca
505 lines
14 KiB
PHP
505 lines
14 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*/
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class SyntaxHighlight_GeSHi {
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/**
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* Has GeSHi been initialised this session?
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*/
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private static $initialised = false;
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/**
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* List of languages available to GeSHi
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* @var array
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*/
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private static $languages = null;
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/**
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* Parser hook
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*
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* @param string $text
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* @param array $args
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* @param Parser $parser
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* @return string
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*/
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public static function parserHook( $text, $args = array(), $parser ) {
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global $wgSyntaxHighlightDefaultLang, $wgUseSiteCss, $wgUseTidy;
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wfProfileIn( __METHOD__ );
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self::initialise();
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$text = rtrim( $text );
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// Don't trim leading spaces away, just the linefeeds
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$text = preg_replace( '/^\n+/', '', $text );
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// Validate language
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if( isset( $args['lang'] ) && $args['lang'] ) {
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$lang = $args['lang'];
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} else {
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// language is not specified. Check if default exists, if yes, use it.
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if ( !is_null( $wgSyntaxHighlightDefaultLang ) ) {
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$lang = $wgSyntaxHighlightDefaultLang;
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} else {
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$error = self::formatLanguageError( $text );
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wfProfileOut( __METHOD__ );
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return $error;
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}
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}
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$lang = strtolower( $lang );
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if( !preg_match( '/^[a-z_0-9-]*$/', $lang ) ) {
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$error = self::formatLanguageError( $text );
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wfProfileOut( __METHOD__ );
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return $error;
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}
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$geshi = self::prepare( $text, $lang );
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if( !$geshi instanceof GeSHi ) {
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$error = self::formatLanguageError( $text );
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wfProfileOut( __METHOD__ );
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return $error;
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}
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$enclose = self::getEncloseType( $args );
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// Line numbers
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if( isset( $args['line'] ) ) {
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$geshi->enable_line_numbers( GESHI_FANCY_LINE_NUMBERS );
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}
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// Highlighting specific lines
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if( isset( $args['highlight'] ) ) {
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$lines = self::parseHighlightLines( $args['highlight'] );
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if ( count( $lines ) ) {
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$geshi->highlight_lines_extra( $lines );
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}
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}
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// Starting line number
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if( isset( $args['start'] ) ) {
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$geshi->start_line_numbers_at( $args['start'] );
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}
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$geshi->set_header_type( $enclose );
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// Strict mode
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if( isset( $args['strict'] ) ) {
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$geshi->enable_strict_mode();
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}
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// Format
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$out = $geshi->parse_code();
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if ( $geshi->error == GESHI_ERROR_NO_SUCH_LANG ) {
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// Common error :D
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$error = self::formatLanguageError( $text );
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wfProfileOut( __METHOD__ );
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return $error;
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}
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$err = $geshi->error();
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if( $err ) {
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// Other unknown error!
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$error = self::formatError( $err );
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wfProfileOut( __METHOD__ );
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return $error;
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}
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// Armour for Parser::doBlockLevels()
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if( $enclose === GESHI_HEADER_DIV ) {
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$out = str_replace( "\n", '', $out );
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}
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// HTML Tidy will convert tabs to spaces incorrectly (bug 30930).
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// But the conversion from tab to space occurs while reading the input,
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// before the conversion from 	 to tab, so we can armor it that way.
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if( $wgUseTidy ) {
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$out = str_replace( "\t", '	', $out );
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}
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// Register CSS
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$parser->getOutput()->addModuleStyles( "ext.geshi.language.$lang" );
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if ( $wgUseSiteCss ) {
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$parser->getOutput()->addModuleStyles( 'ext.geshi.local' );
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}
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$encloseTag = $enclose === GESHI_HEADER_NONE ? 'span' : 'div';
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$attribs = Sanitizer::validateTagAttributes( $args, $encloseTag );
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//lang is valid in HTML context, but also used on GeSHi
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unset( $attribs['lang'] );
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if ( $enclose === GESHI_HEADER_NONE ) {
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$attribs = self::addAttribute( $attribs, 'class', 'mw-geshi ' . $lang . ' source-' . $lang );
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} else {
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// Default dir="ltr" (but allow dir="rtl", although unsure if needed)
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$attribs['dir'] = isset( $attribs['dir'] ) && $attribs['dir'] === 'rtl' ? 'rtl' : 'ltr';
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$attribs = self::addAttribute( $attribs, 'class', 'mw-geshi mw-code mw-content-' . $attribs['dir'] );
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}
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$out = Html::rawElement( $encloseTag, $attribs, $out );
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wfProfileOut( __METHOD__ );
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return $out;
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}
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/**
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* @param $attribs array
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* @param $name string
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* @param $value string
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* @return array
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*/
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private static function addAttribute( $attribs, $name, $value ) {
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if( isset( $attribs[$name] ) ) {
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$attribs[$name] = $value . ' ' . $attribs[$name];
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} else {
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$attribs[$name] = $value;
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}
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return $attribs;
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}
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/**
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* Take an input specifying a list of lines to highlight, returning
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* a raw list of matching line numbers.
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*
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* Input is comma-separated list of lines or line ranges.
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*
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* @param $arg string
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* @return array of ints
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*/
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protected static function parseHighlightLines( $arg ) {
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$lines = array();
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$values = array_map( 'trim', explode( ',', $arg ) );
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foreach ( $values as $value ) {
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if ( ctype_digit($value) ) {
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$lines[] = (int) $value;
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} elseif ( strpos( $value, '-' ) !== false ) {
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list( $start, $end ) = array_map( 'trim', explode( '-', $value ) );
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if ( self::validHighlightRange( $start, $end ) ) {
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for ($i = intval( $start ); $i <= $end; $i++ ) {
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$lines[] = $i;
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}
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} else {
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wfDebugLog( 'geshi', "Invalid range: $value\n" );
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}
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} else {
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wfDebugLog( 'geshi', "Invalid line: $value\n" );
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}
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}
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return $lines;
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}
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/**
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* Validate a provided input range
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* @param $start
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* @param $end
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* @return bool
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*/
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protected static function validHighlightRange( $start, $end ) {
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// Since we're taking this tiny range and producing a an
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// array of every integer between them, it would be trivial
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// to DoS the system by asking for a huge range.
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// Impose an arbitrary limit on the number of lines in a
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// given range to reduce the impact.
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$arbitrarilyLargeConstant = 10000;
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return
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ctype_digit($start) &&
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ctype_digit($end) &&
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$start > 0 &&
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$start < $end &&
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$end - $start < $arbitrarilyLargeConstant;
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}
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/**
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* @param $args array
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* @return int
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*/
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static function getEncloseType( $args ) {
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// "Enclose" parameter
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$enclose = GESHI_HEADER_PRE_VALID;
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if ( isset( $args['enclose'] ) ) {
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if ( $args['enclose'] === 'div' ) {
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$enclose = GESHI_HEADER_DIV;
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} elseif ( $args['enclose'] === 'none' ) {
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$enclose = GESHI_HEADER_NONE;
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}
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}
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return $enclose;
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}
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/**
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* Hook into Content::getParserOutput to provide syntax highlighting for
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* script content.
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*
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* @return bool
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* @since MW 1.21
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*/
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public static function renderHook( Content $content, Title $title,
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$revId, ParserOptions $options, $generateHtml, ParserOutput &$output
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) {
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global $wgSyntaxHighlightModels, $wgUseSiteCss,
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$wgParser, $wgTextModelsToParse;
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// Determine the language
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$model = $content->getModel();
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if ( !isset( $wgSyntaxHighlightModels[$model] ) ) {
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// We don't care about this model, carry on.
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return true;
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}
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if ( !$generateHtml ) {
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// Nothing special for us to do, let MediaWiki handle this.
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return true;
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}
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// Hope that $wgSyntaxHighlightModels does not contain silly types.
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$text = Contenthandler::getContentText( $content );
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if ( $text === null || $text === false ) {
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// Oops! Non-text content? Let MediaWiki handle this.
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return true;
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}
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// Parse using the standard parser to get links etc. into the database, HTML is replaced below.
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// We could do this using $content->fillParserOutput(), but alas it is 'protected'.
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if ( $content instanceof TextContent && in_array( $model, $wgTextModelsToParse ) ) {
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$output = $wgParser->parse( $text, $title, $options, true, true, $revId );
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}
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$lang = $wgSyntaxHighlightModels[$model];
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// Attempt to format
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$geshi = self::prepare( $text, $lang );
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if( $geshi instanceof GeSHi ) {
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$out = $geshi->parse_code();
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if( !$geshi->error() ) {
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// Done
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$output->addModuleStyles( "ext.geshi.language.$lang" );
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$output->setText( "<div dir=\"ltr\">{$out}</div>" );
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if( $wgUseSiteCss ) {
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$output->addModuleStyles( 'ext.geshi.local' );
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}
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// Inform MediaWiki that we have parsed this page and it shouldn't mess with it.
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return false;
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}
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}
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// Bottle out
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return true;
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}
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/**
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* Initialise a GeSHi object to format some code, performing
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* common setup for all our uses of it
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*
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* @param string $text
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* @param string $lang
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* @return GeSHi
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*/
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public static function prepare( $text, $lang ) {
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global $wgSyntaxHighlightKeywordLinks;
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self::initialise();
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$geshi = new GeSHi( $text, $lang );
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if( $geshi->error() == GESHI_ERROR_NO_SUCH_LANG ) {
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return null;
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}
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$geshi->set_encoding( 'UTF-8' );
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$geshi->enable_classes();
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$geshi->set_overall_class( "source-$lang" );
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$geshi->enable_keyword_links( $wgSyntaxHighlightKeywordLinks );
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// If the source code is over 100 kB, disable higlighting of symbols.
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// If over 200 kB, disable highlighting of strings too.
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$bytes = strlen( $text );
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if ( $bytes > 102400 ) {
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$geshi->set_symbols_highlighting( false );
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if ( $bytes > 204800 ) {
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$geshi->set_strings_highlighting( false );
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}
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}
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/**
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* GeSHi comes by default with a font-family set to monospace, which
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* causes the font-size to be smaller than one would expect.
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* We append a CSS hack to the default GeSHi styles: specifying 'monospace'
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* twice "resets" the browser font-size specified for monospace.
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*
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* The hack is documented in MediaWiki core under
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* docs/uidesign/monospace.html and in bug 33496.
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*/
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// Preserve default since we don't want to override the other style
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// properties set by geshi (padding, font-size, vertical-align etc.)
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$geshi->set_code_style(
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'font-family: monospace, monospace;',
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/* preserve defaults = */ true
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);
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// No need to preserve default (which is just "font-family: monospace;")
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// outputting both is unnecessary
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$geshi->set_overall_style(
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'font-family: monospace, monospace;',
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/* preserve defaults = */ false
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);
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return $geshi;
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}
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/**
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* Prepare a CSS snippet suitable for use as a ParserOutput/OutputPage
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* head item.
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*
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* Not used anymore, kept for backwards-compatibility with other extensions.
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*
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* @deprecated
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* @param GeSHi $geshi
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* @return string
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*/
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public static function buildHeadItem( $geshi ) {
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wfDeprecated( __METHOD__ );
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$css = array();
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$css[] = '<style type="text/css">/*<![CDATA[*/';
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$css[] = self::getCSS( $geshi );
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$css[] = '/*]]>*/';
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$css[] = '</style>';
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return implode( "\n", $css );
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}
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/**
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* Get the complete CSS code necessary to display styles for given GeSHi instance.
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*
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* @param GeSHi $geshi
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* @return string
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*/
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public static function getCSS( $geshi ) {
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$lang = $geshi->language;
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$css = array();
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$css[] = ".source-$lang {line-height: normal;}";
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$css[] = ".source-$lang li, .source-$lang pre {";
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$css[] = "\tline-height: normal; border: 0px none white;";
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$css[] = "}";
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$css[] = $geshi->get_stylesheet( /*$economy_mode*/ false );
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return implode( "\n", $css );
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}
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/**
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* Format an 'unknown language' error message and append formatted
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* plain text to it.
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*
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* @param string $text
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* @return string HTML fragment
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*/
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private static function formatLanguageError( $text ) {
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$msg = wfMessage( 'syntaxhighlight-err-language' )->inContentLanguage()->escaped();
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$error = self::formatError( $msg, $text );
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return $error . '<pre>' . htmlspecialchars( $text ) . '</pre>';
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}
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/**
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* Format an error message
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*
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* @param string $error
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* @return string
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*/
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private static function formatError( $error = '' ) {
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$html = '';
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if( $error ) {
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$html .= "<p>{$error}</p>";
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}
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$html .= '<p>' . wfMessage( 'syntaxhighlight-specify')->inContentLanguage()->escaped()
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. ' <samp><source lang="html4strict">...</source></samp></p>'
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. '<p>' . wfMessage( 'syntaxhighlight-supported' )->inContentLanguage()->escaped()
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. '</p>' . self::formatLanguages();
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return "<div style=\"border: solid red 1px; padding: .5em;\">{$html}</div>";
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}
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/**
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* Format the list of supported languages
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*
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* @return string
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*/
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private static function formatLanguages() {
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$langs = self::getSupportedLanguages();
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$list = array();
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if( count( $langs ) > 0 ) {
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foreach( $langs as $lang ) {
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$list[] = '<samp>' . htmlspecialchars( $lang ) . '</samp>';
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}
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return '<p class="mw-collapsible mw-collapsed" style="padding: 0em 1em;">' . implode( ', ', $list ) . '</p><br style="clear: all"/>';
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} else {
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return '<p>' . wfMessage( 'syntaxhighlight-err-loading' )->inContentLanguage()->escaped() . '</p>';
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}
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}
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/**
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* Get the list of supported languages
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*
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* @return array
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*/
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private static function getSupportedLanguages() {
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if( !is_array( self::$languages ) ) {
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self::initialise();
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self::$languages = array();
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foreach( glob( GESHI_LANG_ROOT . "/*.php" ) as $file ) {
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self::$languages[] = basename( $file, '.php' );
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}
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sort( self::$languages );
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}
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return self::$languages;
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}
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/**
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* Initialise messages and ensure the GeSHi class is loaded
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* @return bool
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*/
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private static function initialise() {
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if( !self::$initialised ) {
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if( !class_exists( 'GeSHi' ) ) {
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require( dirname( __FILE__ ) . '/geshi/geshi.php' );
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}
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self::$initialised = true;
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}
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return true;
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}
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/**
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* Get the GeSHI's version information while Special:Version is read.
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* @param $extensionTypes
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* @return bool
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*/
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public static function extensionTypes( &$extensionTypes ) {
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global $wgExtensionCredits;
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self::initialise();
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$wgExtensionCredits['parserhook']['SyntaxHighlight_GeSHi']['version'] = GESHI_VERSION;
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return true;
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}
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/**
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* Register a ResourceLoader module providing styles for each supported language.
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*
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* @param ResourceLoader $resourceLoader
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* @return bool true
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*/
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public static function resourceLoaderRegisterModules( &$resourceLoader ) {
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$modules = array();
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foreach ( self::getSupportedLanguages() as $lang ) {
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$modules["ext.geshi.language.$lang" ] = array(
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'class' => 'ResourceLoaderGeSHiModule',
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'lang' => $lang,
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);
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}
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$resourceLoader->register( $modules );
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return true;
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}
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}
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