ApiExpandTemplates.php

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<?php
class ApiExpandTemplates extends ApiBase {

    public function execute() {
        // Cache may vary on $wgUser because ParserOptions gets data from it
        $this->getMain()->setCacheMode( 'anon-public-user-private' );

        // Get parameters
        $params = $this->extractRequestParams();
        $this->requireMaxOneParameter( $params, 'prop', 'generatexml' );

        if ( $params['prop'] === null ) {
            $this->logFeatureUsage( 'action=expandtemplates&!prop' );
            $this->setWarning( 'Because no values have been specified for the prop parameter, a ' .
                'legacy format has been used for the output. This format is deprecated, and in ' .
                'the future, a default value will be set for the prop parameter, causing the new' .
                'format to always be used.' );
            $prop = [];
        } else {
            $prop = array_flip( $params['prop'] );
        }

        // Get title and revision ID for parser
        $revid = $params['revid'];
        if ( $revid !== null ) {
            $rev = Revision::newFromId( $revid );
            if ( !$rev ) {
                $this->dieUsage( "There is no revision ID $revid", 'missingrev' );
            }
            $title_obj = $rev->getTitle();
        } else {
            $title_obj = Title::newFromText( $params['title'] );
            if ( !$title_obj || $title_obj->isExternal() ) {
                $this->dieUsageMsg( [ 'invalidtitle', $params['title'] ] );
            }
        }

        $result = $this->getResult();

        // Parse text
        global $wgParser;
        $options = ParserOptions::newFromContext( $this->getContext() );

        if ( $params['includecomments'] ) {
            $options->setRemoveComments( false );
        }

        $retval = [];

        if ( isset( $prop['parsetree'] ) || $params['generatexml'] ) {
            $wgParser->startExternalParse( $title_obj, $options, Parser::OT_PREPROCESS );
            $dom = $wgParser->preprocessToDom( $params['text'] );
            if ( is_callable( [ $dom, 'saveXML' ] ) ) {
                $xml = $dom->saveXML();
            } else {
                $xml = $dom->__toString();
            }
            if ( isset( $prop['parsetree'] ) ) {
                unset( $prop['parsetree'] );
                $retval['parsetree'] = $xml;
            } else {
                // the old way
                $result->addValue( null, 'parsetree', $xml );
                $result->addValue( null, ApiResult::META_BC_SUBELEMENTS, [ 'parsetree' ] );
            }
        }

        // if they didn't want any output except (probably) the parse tree,
        // then don't bother actually fully expanding it
        if ( $prop || $params['prop'] === null ) {
            $wgParser->startExternalParse( $title_obj, $options, Parser::OT_PREPROCESS );
            $frame = $wgParser->getPreprocessor()->newFrame();
            $wikitext = $wgParser->preprocess( $params['text'], $title_obj, $options, $revid, $frame );
            if ( $params['prop'] === null ) {
                // the old way
                ApiResult::setContentValue( $retval, 'wikitext', $wikitext );
            } else {
                $p_output = $wgParser->getOutput();
                if ( isset( $prop['categories'] ) ) {
                    $categories = $p_output->getCategories();
                    if ( $categories ) {
                        $categories_result = [];
                        foreach ( $categories as $category => $sortkey ) {
                            $entry = [];
                            $entry['sortkey'] = $sortkey;
                            ApiResult::setContentValue( $entry, 'category', (string)$category );
                            $categories_result[] = $entry;
                        }
                        ApiResult::setIndexedTagName( $categories_result, 'category' );
                        $retval['categories'] = $categories_result;
                    }
                }
                if ( isset( $prop['properties'] ) ) {
                    $properties = $p_output->getProperties();
                    if ( $properties ) {
                        ApiResult::setArrayType( $properties, 'BCkvp', 'name' );
                        ApiResult::setIndexedTagName( $properties, 'property' );
                        $retval['properties'] = $properties;
                    }
                }
                if ( isset( $prop['volatile'] ) ) {
                    $retval['volatile'] = $frame->isVolatile();
                }
                if ( isset( $prop['ttl'] ) && $frame->getTTL() !== null ) {
                    $retval['ttl'] = $frame->getTTL();
                }
                if ( isset( $prop['wikitext'] ) ) {
                    $retval['wikitext'] = $wikitext;
                }
                if ( isset( $prop['modules'] ) ) {
                    $retval['modules'] = array_values( array_unique( $p_output->getModules() ) );
                    $retval['modulescripts'] = array_values( array_unique( $p_output->getModuleScripts() ) );
                    $retval['modulestyles'] = array_values( array_unique( $p_output->getModuleStyles() ) );
                }
                if ( isset( $prop['jsconfigvars'] ) ) {
                    $retval['jsconfigvars'] =
                        ApiResult::addMetadataToResultVars( $p_output->getJsConfigVars() );
                }
                if ( isset( $prop['encodedjsconfigvars'] ) ) {
                    $retval['encodedjsconfigvars'] = FormatJson::encode(
                        $p_output->getJsConfigVars(), false, FormatJson::ALL_OK
                    );
                    $retval[ApiResult::META_SUBELEMENTS][] = 'encodedjsconfigvars';
                }
                if ( isset( $prop['modules'] ) &&
                    !isset( $prop['jsconfigvars'] ) && !isset( $prop['encodedjsconfigvars'] ) ) {
                    $this->setWarning( "Property 'modules' was set but not 'jsconfigvars' " .
                        "or 'encodedjsconfigvars'. Configuration variables are necessary " .
                        'for proper module usage.' );
                }
            }
        }
        ApiResult::setSubelementsList( $retval, [ 'wikitext', 'parsetree' ] );
        $result->addValue( null, $this->getModuleName(), $retval );
    }

    public function getAllowedParams() {
        return [
            'title' => [
                ApiBase::PARAM_DFLT => 'API',
            ],
            'text' => [
                ApiBase::PARAM_TYPE => 'text',
                ApiBase::PARAM_REQUIRED => true,
            ],
            'revid' => [
                ApiBase::PARAM_TYPE => 'integer',
            ],
            'prop' => [
                ApiBase::PARAM_TYPE => [
                    'wikitext',
                    'categories',
                    'properties',
                    'volatile',
                    'ttl',
                    'modules',
                    'jsconfigvars',
                    'encodedjsconfigvars',
                    'parsetree',
                ],
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
            'includecomments' => false,
            'generatexml' => [
                ApiBase::PARAM_TYPE => 'boolean',
                ApiBase::PARAM_DEPRECATED => true,
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=expandtemplates&text={{Project:Sandbox}}'
                => 'apihelp-expandtemplates-example-simple',
        ];
    }

    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/API:Parsing_wikitext#expandtemplates';
    }
}