ApiParamInfo.php

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<?php
class ApiParamInfo extends ApiBase {

    protected $queryObj;

    public function __construct( ApiMain $main, $action ) {
        parent::__construct( $main, $action );
        $this->queryObj = new ApiQuery( $this->getMain(), 'query' );
    }

    public function execute() {
        // Get parameters
        $params = $this->extractRequestParams();
        $resultObj = $this->getResult();

        $res = array();

        $this->addModulesInfo( $params, 'modules', $res, $resultObj );

        $this->addModulesInfo( $params, 'querymodules', $res, $resultObj );

        if ( $params['mainmodule'] ) {
            $res['mainmodule'] = $this->getClassInfo( $this->getMain() );
        }

        if ( $params['pagesetmodule'] ) {
            $pageSet = new ApiPageSet( $this->queryObj );
            $res['pagesetmodule'] = $this->getClassInfo( $pageSet );
        }

        $this->addModulesInfo( $params, 'formatmodules', $res, $resultObj );

        $resultObj->addValue( null, $this->getModuleName(), $res );
    }

    private function addModulesInfo( $params, $type, &$res, $resultObj ) {
        if ( !is_array( $params[$type] ) ) {
            return;
        }
        $isQuery = ( $type === 'querymodules' );
        if ( $isQuery ) {
            $mgr = $this->queryObj->getModuleManager();
        } else {
            $mgr = $this->getMain()->getModuleManager();
        }
        $res[$type] = array();
        foreach ( $params[$type] as $mod ) {
            if ( !$mgr->isDefined( $mod ) ) {
                $res[$type][] = array( 'name' => $mod, 'missing' => '' );
                continue;
            }
            $obj = $mgr->getModule( $mod );
            $item = $this->getClassInfo( $obj );
            $item['name'] = $mod;
            if ( $isQuery ) {
                $item['querytype'] = $mgr->getModuleGroup( $mod );
            }
            $res[$type][] = $item;
        }
        $resultObj->setIndexedTagName( $res[$type], 'module' );
    }

    private function getClassInfo( $obj ) {
        $result = $this->getResult();
        $retval['classname'] = get_class( $obj );
        $retval['description'] = implode( "\n", (array)$obj->getFinalDescription() );
        $retval['examples'] = '';

        // version is deprecated since 1.21, but needs to be returned for v1
        $retval['version'] = '';
        $retval['prefix'] = $obj->getModulePrefix();

        if ( $obj->isReadMode() ) {
            $retval['readrights'] = '';
        }
        if ( $obj->isWriteMode() ) {
            $retval['writerights'] = '';
        }
        if ( $obj->mustBePosted() ) {
            $retval['mustbeposted'] = '';
        }
        if ( $obj instanceof ApiQueryGeneratorBase ) {
            $retval['generator'] = '';
        }

        $allowedParams = $obj->getFinalParams( ApiBase::GET_VALUES_FOR_HELP );
        if ( !is_array( $allowedParams ) ) {
            return $retval;
        }

        $retval['helpurls'] = (array)$obj->getHelpUrls();
        if ( isset( $retval['helpurls'][0] ) && $retval['helpurls'][0] === false ) {
            $retval['helpurls'] = array();
        }
        $result->setIndexedTagName( $retval['helpurls'], 'helpurl' );

        $examples = $obj->getExamples();
        $retval['allexamples'] = array();
        if ( $examples !== false ) {
            if ( is_string( $examples ) ) {
                $examples = array( $examples );
            }
            foreach ( $examples as $k => $v ) {
                if ( strlen( $retval['examples'] ) ) {
                    $retval['examples'] .= ' ';
                }
                $item = array();
                if ( is_numeric( $k ) ) {
                    $retval['examples'] .= $v;
                    ApiResult::setContent( $item, $v );
                } else {
                    if ( !is_array( $v ) ) {
                        $item['description'] = $v;
                    } else {
                        $item['description'] = implode( $v, "\n" );
                    }
                    $retval['examples'] .= $item['description'] . ' ' . $k;
                    ApiResult::setContent( $item, $k );
                }
                $retval['allexamples'][] = $item;
            }
        }
        $result->setIndexedTagName( $retval['allexamples'], 'example' );

        $retval['parameters'] = array();
        $paramDesc = $obj->getFinalParamDescription();
        foreach ( $allowedParams as $n => $p ) {
            $a = array( 'name' => $n );
            if ( isset( $paramDesc[$n] ) ) {
                $a['description'] = implode( "\n", (array)$paramDesc[$n] );
            }

            //handle shorthand
            if ( !is_array( $p ) ) {
                $p = array(
                    ApiBase::PARAM_DFLT => $p,
                );
            }

            //handle missing type
            if ( !isset( $p[ApiBase::PARAM_TYPE] ) ) {
                $dflt = isset( $p[ApiBase::PARAM_DFLT] ) ? $p[ApiBase::PARAM_DFLT] : null;
                if ( is_bool( $dflt ) ) {
                    $p[ApiBase::PARAM_TYPE] = 'boolean';
                } elseif ( is_string( $dflt ) || is_null( $dflt ) ) {
                    $p[ApiBase::PARAM_TYPE] = 'string';
                } elseif ( is_int( $dflt ) ) {
                    $p[ApiBase::PARAM_TYPE] = 'integer';
                }
            }

            if ( isset( $p[ApiBase::PARAM_DEPRECATED] ) && $p[ApiBase::PARAM_DEPRECATED] ) {
                $a['deprecated'] = '';
            }
            if ( isset( $p[ApiBase::PARAM_REQUIRED] ) && $p[ApiBase::PARAM_REQUIRED] ) {
                $a['required'] = '';
            }

            if ( $n === 'token' && $obj->needsToken() ) {
                $a['tokentype'] = $obj->needsToken();
            }

            if ( isset( $p[ApiBase::PARAM_DFLT] ) ) {
                $type = $p[ApiBase::PARAM_TYPE];
                if ( $type === 'boolean' ) {
                    $a['default'] = ( $p[ApiBase::PARAM_DFLT] ? 'true' : 'false' );
                } elseif ( $type === 'string' ) {
                    $a['default'] = strval( $p[ApiBase::PARAM_DFLT] );
                } elseif ( $type === 'integer' ) {
                    $a['default'] = intval( $p[ApiBase::PARAM_DFLT] );
                } else {
                    $a['default'] = $p[ApiBase::PARAM_DFLT];
                }
            }
            if ( isset( $p[ApiBase::PARAM_ISMULTI] ) && $p[ApiBase::PARAM_ISMULTI] ) {
                $a['multi'] = '';
                $a['limit'] = $this->getMain()->canApiHighLimits() ?
                    ApiBase::LIMIT_SML2 :
                    ApiBase::LIMIT_SML1;
                $a['lowlimit'] = ApiBase::LIMIT_SML1;
                $a['highlimit'] = ApiBase::LIMIT_SML2;
            }

            if ( isset( $p[ApiBase::PARAM_ALLOW_DUPLICATES] ) && $p[ApiBase::PARAM_ALLOW_DUPLICATES] ) {
                $a['allowsduplicates'] = '';
            }

            if ( isset( $p[ApiBase::PARAM_TYPE] ) ) {
                if ( $p[ApiBase::PARAM_TYPE] === 'submodule' ) {
                    $a['type'] = $obj->getModuleManager()->getNames( $n );
                    sort( $a['type'] );
                    $a['submodules'] = '';
                } else {
                    $a['type'] = $p[ApiBase::PARAM_TYPE];
                }
                if ( is_array( $a['type'] ) ) {
                    // To prevent sparse arrays from being serialized to JSON as objects
                    $a['type'] = array_values( $a['type'] );
                    $result->setIndexedTagName( $a['type'], 't' );
                }
            }
            if ( isset( $p[ApiBase::PARAM_MAX] ) ) {
                $a['max'] = $p[ApiBase::PARAM_MAX];
            }
            if ( isset( $p[ApiBase::PARAM_MAX2] ) ) {
                $a['highmax'] = $p[ApiBase::PARAM_MAX2];
            }
            if ( isset( $p[ApiBase::PARAM_MIN] ) ) {
                $a['min'] = $p[ApiBase::PARAM_MIN];
            }
            $retval['parameters'][] = $a;
        }
        $result->setIndexedTagName( $retval['parameters'], 'param' );

        return $retval;
    }

    public function isReadMode() {
        return false;
    }

    public function getAllowedParams() {
        $modules = $this->getMain()->getModuleManager()->getNames( 'action' );
        sort( $modules );
        $querymodules = $this->queryObj->getModuleManager()->getNames();
        sort( $querymodules );
        $formatmodules = $this->getMain()->getModuleManager()->getNames( 'format' );
        sort( $formatmodules );

        return array(
            'modules' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => $modules,
            ),
            'querymodules' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => $querymodules,
            ),
            'mainmodule' => false,
            'pagesetmodule' => false,
            'formatmodules' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => $formatmodules,
            )
        );
    }

    public function getParamDescription() {
        return array(
            'modules' => 'List of module names (value of the action= parameter)',
            'querymodules' => 'List of query module names (value of prop=, meta= or list= parameter)',
            'mainmodule' => 'Get information about the main (top-level) module as well',
            'pagesetmodule' => 'Get information about the pageset module ' .
                '(providing titles= and friends) as well',
            'formatmodules' => 'List of format module names (value of format= parameter)',
        );
    }

    public function getDescription() {
        return 'Obtain information about certain API parameters and errors.';
    }

    public function getExamples() {
        return array(
            'api.php?action=paraminfo&modules=parse&querymodules=allpages|siteinfo'
        );
    }

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