Initial commit

This configures a MediaWiki extension to recieve Parsoid's lint errors
and expose them to users.

Change-Id: Ie0776aecf145eb1c87c2a539ddf3ea8d35a899f5

.gitignore

@@ -0,0 +1,7 @@
+.svn
+*~
+*.kate-swp
+.*.swp
+composer.lock
+vendor
+node_modules/

.jscsrc

@@ -0,0 +1,4 @@
+{
+	"preset": "wikimedia",
+	"es3": true
+}

.jshintignore

@@ -0,0 +1 @@
+node_modules

.jshintrc

@@ -0,0 +1,24 @@
+{
+	// Enforcing
+	"bitwise": true,
+	"eqeqeq": true,
+	"freeze": true,
+	"latedef": true,
+	"noarg": true,
+	"nonew": true,
+	"undef": true,
+	"unused": true,
+	"strict": false,
+
+	// Relaxing
+	"es5": false,
+
+	// Environment
+	"browser": true,
+	"jquery": true,
+
+	"globals": {
+		"mediaWiki": false,
+		"OO": false
+	}
+}

COPYING

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
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+
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+a notice placed by the copyright holder saying it may be distributed
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+    <one line to give the program's name and a brief idea of what it does.>
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+
+Also add information on how to contact you by electronic and paper mail.
+
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+    Gnomovision version 69, Copyright (C) year name of author
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+    This is free software, and you are welcome to redistribute it
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+
+The hypothetical commands `show w' and `show c' should show the appropriate
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+be called something other than `show w' and `show c'; they could even be
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+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

Gruntfile.js

@@ -0,0 +1,32 @@
+/*jshint node:true */
+module.exports = function ( grunt ) {
+	grunt.loadNpmTasks( 'grunt-contrib-jshint' );
+	grunt.loadNpmTasks( 'grunt-jsonlint' );
+	grunt.loadNpmTasks( 'grunt-banana-checker' );
+	grunt.loadNpmTasks( 'grunt-jscs' );
+	var conf = grunt.file.readJSON( 'extension.json' );
+
+	grunt.initConfig( {
+		jshint: {
+			options: {
+				jshintrc: true
+			},
+			all: [
+				'modules/*.js'
+			]
+		},
+		jscs: {
+			src: '<%= jshint.all %>'
+		},
+		banana: conf.MessagesDirs,
+		jsonlint: {
+			all: [
+				'**/*.json',
+				'!node_modules/**'
+			]
+		}
+	} );
+
+	grunt.registerTask( 'test', [ 'jshint', 'jscs', 'jsonlint', 'banana' ] );
+	grunt.registerTask( 'default', 'test' );
+};

README

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+Extension to help lint wiki pages. Currently designed to take advantage
+of Parsoid's linter, could also be extended to linting JS or CSS in the
+future.

composer.json

@@ -0,0 +1,15 @@
+{
+	"require-dev": {
+		"jakub-onderka/php-parallel-lint": "0.9",
+		"mediawiki/mediawiki-codesniffer": "0.8.0-alpha.1"
+	},
+	"scripts": {
+		"test": [
+			"parallel-lint . --exclude vendor",
+			"phpcs -p -s"
+		],
+		"fix": [
+			"phpcbf"
+		]
+	}
+}

extension.json

@@ -0,0 +1,60 @@
+{
+	"name": "Linter",
+	"license-name": "GPL-2.0+",
+	"url": "https://www.mediawiki.org/wiki/Extension:Linter",
+	"author": [
+		"Kunal Mehta"
+	],
+	"descriptionmsg": "linter-desc",
+	"type": "specialpage",
+	"AutoloadClasses": {
+		"MediaWiki\\Linter\\Hooks": "includes/Hooks.php",
+		"MediaWiki\\Linter\\Database": "includes/Database.php",
+		"MediaWiki\\Linter\\LintError": "includes/LintError.php",
+		"MediaWiki\\Linter\\ApiRecordLint": "includes/ApiRecordLint.php",
+		"MediaWiki\\Linter\\ApiQueryLintErrors": "includes/ApiQueryLintErrors.php",
+		"MediaWiki\\Linter\\SpecialLintErrors": "includes/SpecialLintErrors.php",
+		"MediaWiki\\Linter\\LintErrorsPager": "includes/LintErrorsPager.php"
+	},
+	"MessagesDirs": {
+		"Linter": "i18n"
+	},
+	"Hooks": {
+		"LoadExtensionSchemaUpdates": "MediaWiki\\Linter\\Hooks::onLoadExtensionSchemaUpdates",
+		"EditFormInitialText": "MediaWiki\\Linter\\Hooks::onEditFormInitialText"
+	},
+	"APIModules": {
+		"record-lint": "MediaWiki\\Linter\\ApiRecordLint"
+	},
+	"APIListModules": {
+		"linterrors": "MediaWiki\\Linter\\ApiQueryLintErrors"
+	},
+	"SpecialPages": {
+		"LintErrors": "MediaWiki\\Linter\\SpecialLintErrors"
+	},
+	"ResourceModules": {
+		"ext.linter.edit": {
+			"scripts": "ext.linter.edit.js",
+			"dependencies": [
+				"jquery.textSelection"
+			]
+		}
+	},
+	"ResourceFileModulePaths": {
+		"localBasePath": "modules",
+		"remoteExtPath": "Linter/modules"
+	},
+	"config": {
+		"LinterCategories": {
+			"fostered": true,
+			"obsolete-tag": true,
+			"bogus-image-options": true,
+			"missing-end-tag": true,
+			"stripped-tag": true
+		},
+		"LinterSubmitterWhitelist": {
+			"127.0.0.1": true
+		}
+	},
+	"manifest_version": 1
+}

i18n/en.json

@@ -0,0 +1,38 @@
+{
+	"@metadata": {
+		"authors": [
+			"Kunal Mehta"
+		]
+	},
+	"linterrors": "Lint errors",
+	"linterrors-subpage": "Lint errors: $1",
+	"linter-desc": "Track lint errors from an external service and show them to users",
+	"linter-pager-title": "Page title",
+	"linter-pager-template": "Through a template?",
+	"linter-pager-obsolete-tag-details": "Obsolete HTML tag",
+	"linter-pager-bogus-image-options-details": "Bogus file option",
+	"linter-pager-missing-end-tag-details": "Missing end tag",
+	"linter-pager-stripped-tag-details": "Stripped tag",
+	"linter-category-fostered": "Fostered content",
+	"linter-category-fostered-desc": "These pages have fostered content.",
+	"linter-category-obsolete-tag": "Obsolete HTML tags",
+	"linter-category-obsolete-tag-desc": "These pages use obsolete HTML tags.",
+	"linter-category-bogus-image-options": "Bogus file options",
+	"linter-category-bogus-image-options-desc": "These pages have files with bogus options.",
+	"linter-category-missing-end-tag": "Missing end tag",
+	"linter-category-missing-end-tag-desc": "These pages have missing end tags.",
+	"linter-category-stripped-tag": "Stripped tags",
+	"linter-category-stripped-tag-desc": "These pages have stripped tags.",
+	"linker-page-title-edit": "$1 ($2)",
+	"linker-page-edit": "edit",
+	"apihelp-query+linterrors-description": "Get a list of lint errors",
+	"apihelp-query+linterrors-param-category": "Category of lint errors",
+	"apihelp-query+linterrors-param-limit": "Number of results to query",
+	"apihelp-query+linterrors-param-from": "Lint ID to start querying from",
+	"apihelp-query+linterrors-param-namespace": "Only include lint errors from the specified namespaces",
+	"apihelp-query+linterrors-example-1": "Get all lint errors of the obsolete-tag category",
+	"apihelp-record-lint-description": "Record a lint error in the database",
+	"apihelp-record-lint-param-data": "JSON encoded data about the error",
+	"apihelp-record-lint-param-page": "Page title",
+	"apihelp-record-lint-param-revision": "Revision ID that the error was found in"
+}

i18n/qqq.json

@@ -0,0 +1,38 @@
+{
+	"@metadata": {
+		"authors": [
+			"Kunal Mehta"
+		]
+	},
+	"linterrors": "{{doc-special|LintErrors}}",
+	"linterrors-subpage": "Page title for Special:LintErrors, $1 is the localized category description",
+	"linter-desc": "{{desc|name=Linter|url=https://www.mediawiki.org/wiki/Extension:Linter}}",
+	"linter-pager-title": "Table column heading for the column with page titles in it",
+	"linter-pager-template": "Table column heading for column with template title in it or an em dash if lint error is not inside a template",
+	"linter-pager-obsolete-tag-details": "Table column heading",
+	"linter-pager-bogus-image-options-details": "Table column heading",
+	"linter-pager-missing-end-tag-details": "Table column heading",
+	"linter-pager-stripped-tag-details": "Table column heading",
+	"linter-category-fostered": "Name of lint error category",
+	"linter-category-fostered-desc": "Description of category.",
+	"linter-category-obsolete-tag": "Name of lint error category",
+	"linter-category-obsolete-tag-desc": "Description of category.",
+	"linter-category-bogus-image-options": "Name of lint error category",
+	"linter-category-bogus-image-options-desc": "Description of category",
+	"linter-category-missing-end-tag": "Name of lint error category",
+	"linter-category-missing-end-tag-desc": "Description of category",
+	"linter-category-stripped-tag": "Name of lint error category",
+	"linter-category-stripped-tag-desc": "Description of category",
+	"linker-page-title-edit": "Used in a table cell. $1 is a link to the page, $2 is a link to edit that page, the link text is {{msg-mw|linker-page-edit}}",
+	"linker-page-edit": "Link text for edit link in {{msg-mw|linker-page-title-edit}} and {{msg-mw|linker-page-title-edit-template}}",
+	"apihelp-query+linterrors-description": "{{doc-apihelp-description|query+linterrors}}",
+	"apihelp-query+linterrors-param-category": "{{doc-apihelp-param|query+linterrors|category}}",
+	"apihelp-query+linterrors-param-limit": "{{doc-apihelp-param|query+linterrors|limit}}",
+	"apihelp-query+linterrors-param-from": "{{doc-apihelp-param|query+linterrors|from}}",
+	"apihelp-query+linterrors-param-namespace": "{{doc-apihelp-param|query+linterrors|namespace}}",
+	"apihelp-query+linterrors-example-1": "{{doc-apihelp-example|query+linterrors}}",
+	"apihelp-record-lint-description": "{{doc-apihelp-description|record-lint}}",
+	"apihelp-record-lint-param-data": "{{doc-apihelp-param|record-lint|data}}",
+	"apihelp-record-lint-param-page": "{{doc-apihelp-param|record-lint|page}}",
+	"apihelp-record-lint-param-revision": "{{doc-apihelp-param|record-lint|revision}}"
+}

includes/ApiQueryLintErrors.php

@@ -0,0 +1,127 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+namespace MediaWiki\Linter;
+
+use ApiBase;
+use ApiQuery;
+use ApiQueryBase;
+use ApiResult;
+use Title;
+
+class ApiQueryLintErrors extends ApiQueryBase {
+	public function __construct( ApiQuery $queryModule, $moduleName ) {
+		parent::__construct( $queryModule, $moduleName, 'lnt' );
+	}
+
+	public function execute() {
+		$params = $this->extractRequestParams();
+
+		$this->addTables( 'linter' );
+		if ( $params['category'] !== null ) {
+			$this->addWhereFld( 'linter_cat', $params['category'] );
+		} else {
+			// Limit only to enabled categories (there might be others in the DB)
+			$this->addWhereFld( 'linter_cat', $this->getCategories() );
+		}
+		$db = $this->getDB();
+		if ( $params['from'] !== null ) {
+			$this->addWhere( 'linter_id >= ' . $db->addQuotes( $params['from'] ) );
+		}
+		if ( $params['namespace'] !== null ) {
+			$this->addWhereFld( 'page_namespace', $params['namespace'] );
+		}
+		$this->addTables( 'page' );
+		$this->addJoinConds( [ 'page' => [ 'INNER JOIN', 'page_id=linter_page' ] ] );
+		$this->addFields( [
+			'linter_id', 'linter_cat', 'linter_params',
+			'page_namespace', 'page_title',
+		] );
+		// Be explicit about ORDER BY
+		$this->addOption( 'ORDER BY', 'linter_id' );
+		// Add +1 to limit to know if there's another row for continuation
+		$this->addOption( 'LIMIT', $params['limit'] + 1 );
+		$rows = $this->select( __METHOD__ );
+		$result = $this->getResult();
+		$count = 0;
+		foreach ( $rows as $row ) {
+			$lintError = Database::makeLintError( $row );
+			$count++;
+			if ( $count > $params['limit'] ) {
+				$this->setContinueEnumParameter( 'from', $lintError->lintId );
+				break;
+			}
+			$title = Title::makeTitle( $row->page_namespace, $row->page_title );
+
+			$data = [
+				'title' => $title->getPrefixedText(),
+				'lintId' => $lintError->lintId,
+				'category' => $lintError->category,
+				'location' => $lintError->location,
+				'templateInfo' => $lintError->templateInfo,
+				'params' => $lintError->getExtraParams(),
+			];
+			// template info and params are an object
+			$data['params'][ApiResult::META_TYPE] = 'assoc';
+			$data['templateInfo'][ApiResult::META_TYPE] = 'assoc';
+
+			$fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $data );
+			if ( !$fit ) {
+				$this->setContinueEnumParameter( 'from', $lintError->lintId );
+				break;
+			}
+		}
+	}
+
+	private function getCategories() {
+		global $wgLinterCategories;
+		return array_keys( array_filter( $wgLinterCategories ) );
+	}
+
+	public function getAllowedParams() {
+		return [
+			'category' => [
+				ApiBase::PARAM_TYPE => $this->getCategories(),
+				ApiBase::PARAM_ISMULTI => true,
+			],
+			'limit' => [
+				ApiBase::PARAM_DFLT => 10,
+				ApiBase::PARAM_TYPE => 'limit',
+				ApiBase::PARAM_MIN => 1,
+				ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
+				ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
+			],
+			'namespace' => [
+				ApiBase::PARAM_TYPE => 'namespace',
+				ApiBase::PARAM_ISMULTI => true,
+			],
+			'from' => [
+				ApiBase::PARAM_TYPE => 'integer',
+			],
+		];
+	}
+
+	public function getExamplesMessages() {
+		return [
+			'action=query&list=linterrors&lecategory=obsolete-tag' =>
+				'apihelp-query+linterrors-example-1',
+		];
+	}
+}

includes/ApiRecordLint.php

@@ -0,0 +1,86 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+namespace MediaWiki\Linter;
+
+use ApiBase;
+use FormatJson;
+use IPSet\IPSet;
+use Title;
+
+/**
+ * API module for an external service to record
+ * a lint error
+ */
+class ApiRecordLint extends ApiBase {
+
+	public function execute() {
+		global $wgLinterSubmitterWhitelist;
+
+		$ipSet = new IPSet(
+			array_keys( array_filter( $wgLinterSubmitterWhitelist ) )
+		);
+		if ( !$ipSet->match( $this->getRequest()->getIP() ) ) {
+			$this->dieUsage(
+				'Your IP address has not been whitelisted to report lint errors',
+				'invalid-ip'
+			);
+		}
+		$params = $this->extractRequestParams();
+		$data = FormatJson::decode( $params['data'], true );
+		if ( !is_array( $data ) ) {
+			$this->dieUsage( 'Invalid data', 'invalid-data' );
+		}
+
+		$errors = [];
+		$title = Title::newFromText( $params['page'] );
+		if ( !$title || !$title->getArticleID()
+			|| $title->getLatestRevID() != $params['revision']
+		) {
+			$this->dieUsage( 'Invalid, non-existent, or outdated title', 'invalid-title' );
+		}
+		foreach ( $data as $info ) {
+			$info['params']['location'] = array_slice( $info['dsr'], 0, 2 );
+			if ( isset( $info['templateInfo'] ) && $info['templateInfo'] ) {
+				$info['params']['templateInfo'] = $info['templateInfo'];
+			}
+			$errors[] = new LintError(
+				$info['type'],
+				$info['params']
+			);
+		}
+
+		$lintDb = new Database( $title->getArticleID() );
+		$result = $lintDb->setForPage( $errors );
+		$this->getResult()->addValue( $this->getModuleName(), 'success', $result );
+	}
+
+	public function isInternal() {
+		return true;
+	}
+
+	public function getAllowedParams() {
+		return [
+			'data' => 'string',
+			'page' => 'string',
+			'revision' => 'int',
+		];
+	}
+}

includes/Database.php

@@ -0,0 +1,191 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+namespace MediaWiki\Linter;
+
+use DBAccessObjectUtils;
+use IDBAccessObject;
+use FormatJson;
+
+/**
+ * Database logic
+ */
+class Database implements IDBAccessObject {
+	/**
+	 * @var int
+	 */
+	private $pageId;
+
+	/**
+	 * @param int $pageId
+	 */
+	public function __construct( $pageId ) {
+		$this->pageId = $pageId;
+	}
+
+	/**
+	 * Get a specific LintError by id
+	 *
+	 * @param int $id linter_id
+	 * @param int $flags
+	 * @return bool|LintError
+	 */
+	public function getFromId( $id, $flags = 0 ) {
+		list( $index, $options ) = DBAccessObjectUtils::getDBOptions( $flags );
+		$row = wfGetDB( $index )->selectRow(
+			'linter',
+			[ 'linter_cat', 'linter_params' ],
+			[ 'linter_id' => $id, 'linter_page' => $this->pageId ],
+			__METHOD__,
+			$options
+		);
+
+		if ( $row ) {
+			$row->linter_id = $id;
+			return $this->makeLintError( $row );
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Turn a database row into a LintError object
+	 *
+	 * @param \stdClass $row
+	 * @return LintError
+	 */
+	public static function makeLintError( $row ) {
+		return new LintError(
+			$row->linter_cat,
+			$row->linter_params,
+			(int)$row->linter_id
+		);
+	}
+
+	/**
+	 * Get all the lint errors for a page
+	 *
+	 * @param int $flags
+	 * @return LintError[]
+	 */
+	public function getForPage( $flags = 0 ) {
+		list( $index, $options ) = DBAccessObjectUtils::getDBOptions( $flags );
+		$rows = wfGetDB( $index )->select(
+			'linter',
+			[ 'linter_id', 'linter_cat', 'linter_params' ],
+			[ 'linter_page' => $this->pageId ],
+			__METHOD__,
+			$options
+		);
+		$result = [];
+		foreach ( $rows as $row ) {
+			$error = $this->makeLintError( $row );
+			$result[$error->id()] = $error;
+		}
+
+		return $result;
+	}
+
+	/**
+	 * Convert a LintError object into an array for
+	 * inserting/querying in the database
+	 *
+	 * @param LintError $error
+	 * @return array
+	 */
+	private function serializeError( LintError $error ) {
+		if ( $error->lintId !== 0 ) {
+			return [
+				'linter_id' => $error->lintId,
+			];
+		} else {
+			return [
+				'linter_page' => $this->pageId,
+				'linter_cat' => $error->category,
+				'linter_params' => FormatJson::encode( $error->params, false, FormatJson::ALL_OK ),
+			];
+		}
+	}
+
+	/**
+	 * Save the specified lint errors in the
+	 * database
+	 *
+	 * @param LintError[] $errors
+	 * @return array [ 'deleted' => int|bool, 'added' => int ]
+	 */
+	public function setForPage( $errors ) {
+		$previous = $this->getForPage( self::READ_LATEST );
+		$dbw = wfGetDB( DB_MASTER );
+		if ( !$previous && !$errors ) {
+			return [ 'deleted' => 0, 'added' => 0 ];
+		} elseif ( !$previous && $errors ) {
+			$toInsert = $errors;
+			$toDelete = [];
+		} elseif ( $previous && !$errors ) {
+			$dbw->delete(
+				'linter',
+				[ 'linter_page' => $this->pageId ],
+				__METHOD__
+			);
+			return [ 'deleted' => true, 'added' => 0 ];
+		} else {
+			$toInsert = [];
+			$toDelete = $previous;
+			// Diff previous and errors
+			foreach ( $errors as $error ) {
+				$uniqueId = $error->id();
+				if ( isset( $previous[$uniqueId] ) ) {
+					unset( $toDelete[$uniqueId] );
+				} else {
+					$toInsert[] = $error;
+				}
+			}
+		}
+
+		if ( $toDelete ) {
+			$ids = [];
+			foreach ( $toDelete as $lintError ) {
+				if ( $lintError->lintId ) {
+					$ids[] = $lintError->lintId;
+				}
+			}
+			$dbw->delete(
+				'linter',
+				[ 'linter_id' => $ids ],
+				__METHOD__
+			);
+		}
+
+		if ( $toInsert ) {
+			$dbw->insert(
+				'linter',
+				array_map( [ $this, 'serializeError' ], $toInsert ),
+				__METHOD__
+			);
+		}
+
+		return [
+			'deleted' => count( $toDelete ),
+			'added' => count( $toInsert ),
+		];
+	}
+
+}

includes/Hooks.php

@@ -0,0 +1,66 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+namespace MediaWiki\Linter;
+
+use DatabaseUpdater;
+use EditPage;
+
+class Hooks {
+	/**
+	 * @param DatabaseUpdater $updater
+	 */
+	public static function onLoadExtensionSchemaUpdates( DatabaseUpdater $updater ) {
+		$updater->addExtensionTable(
+			'linter', dirname( __DIR__ ) . '/linter.sql'
+		);
+	}
+
+	/**
+	 * Hook: EditFormInitialText
+	 *
+	 * If there is a lintid parameter, look up that error in the database
+	 * and setup and output our client-side helpers
+	 *
+	 * @param EditPage $editPage
+	 */
+	public static function onEditFormInitialText( EditPage $editPage ) {
+		$context = $editPage->getContext();
+		$request = $context->getRequest();
+		$lintId = $request->getInt( 'lintid' );
+		if ( !$lintId ) {
+			return;
+		}
+		$title = $editPage->getTitle();
+
+		$lintError = ( new Database( $title->getArticleID() ) )->getFromId( $lintId );
+		if ( !$lintError ) {
+			// Already fixed or bogus URL parameter?
+			return;
+		}
+
+		$out = $context->getOutput();
+		$out->addJsConfigVars( [
+			'wgLinterErrorCategory' => $lintError->category,
+			'wgLinterErrorLocation' => $lintError->location,
+		] );
+		$out->addModules( 'ext.linter.edit' );
+	}
+}

includes/LintError.php

@@ -0,0 +1,105 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+namespace MediaWiki\Linter;
+
+use FormatJson;
+
+/**
+ * Model to represent a LintError
+ */
+class LintError {
+	/**
+	 * @var string
+	 */
+	public $category;
+
+	/**
+	 * @var int[] [ start, end ]
+	 */
+	public $location;
+
+	/**
+	 * @var int
+	 */
+	public $lintId;
+
+	/**
+	 * @var array
+	 */
+	public $params;
+
+	/**
+	 * @var bool
+	 */
+	public $templateInfo;
+
+	/**
+	 * @param string $category
+	 * @param string|array $params JSON string or already decoded array
+	 * @param int $lintId linter_id
+	 */
+	public function __construct( $category, $params, $lintId = 0 ) {
+		$this->category = $category;
+		if ( is_string( $params ) ) {
+			$params = FormatJson::decode( $params, true );
+		}
+		$this->params = $params;
+		$this->lintId = $lintId;
+		// Convenient accessors for all errors
+		$this->location = $params['location'];
+		$this->templateInfo = isset( $params['templateInfo'] )
+			? $params['templateInfo'] : null;
+	}
+
+	/**
+	 * @param LintError $other
+	 * @return bool
+	 */
+	public function equals( LintError $other ) {
+		return $this->category === $other->category
+			&& $this->params === $other->params;
+	}
+
+	/**
+	 * Unique id to identify this error, for internal
+	 * purposes
+	 *
+	 * @return string
+	 */
+	public function id() {
+		return $this->category . FormatJson::encode( $this->params );
+	}
+
+	/**
+	 * Get the params that are extra for this error,
+	 * not part of the default set
+	 *
+	 * @return array
+	 */
+	public function getExtraParams() {
+		$params = $this->params;
+		unset( $params['templateInfo'] );
+		unset( $params['location'] );
+
+		return $params;
+	}
+
+}

includes/LintErrorsPager.php

@@ -0,0 +1,137 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+namespace MediaWiki\Linter;
+
+use IContextSource;
+use InvalidArgumentException;
+use LinkCache;
+use Html;
+use MediaWiki\Linker\LinkRenderer;
+use MediaWiki\MediaWikiServices;
+use TablePager;
+use TitleValue;
+use Title;
+
+class LintErrorsPager extends TablePager {
+
+	private $category;
+	/**
+	 * @var LinkRenderer
+	 */
+	private $linkRenderer;
+
+	public function __construct( IContextSource $context, $category, LinkRenderer $linkRenderer ) {
+		$this->category = $category;
+		$this->linkRenderer = $linkRenderer;
+		parent::__construct( $context );
+	}
+
+	public function getQueryInfo() {
+		return [
+			'tables' => [ 'page', 'linter' ],
+			'fields' => array_merge(
+				LinkCache::getSelectFields(),
+				[
+					'page_namespace', 'page_title',
+					'linter_id', 'linter_params',
+				]
+			),
+			'conds' => [ 'linter_cat' => $this->category ],
+			'join_conds' => [ 'page' => [ 'INNER JOIN', 'page_id=linter_page' ] ]
+		];
+	}
+
+	protected function doBatchLookups() {
+		$linkCache = MediaWikiServices::getInstance()->getLinkCache();
+		foreach ( $this->mResult as $row ) {
+			$titleValue = new TitleValue( (int)$row->page_namespace, $row->page_title );
+			$linkCache->addGoodLinkObjFromRow( $titleValue, $row );
+		}
+	}
+
+	public function isFieldSortable( $field ) {
+		return false;
+	}
+
+	public function formatValue( $name, $value ) {
+		$row = $this->mCurrentRow;
+		$row->linter_cat = $this->category;
+		$lintError = Database::makeLintError( $row );
+		switch ( $name ) {
+			case 'title':
+				$title = Title::makeTitle( $row->page_namespace, $row->page_title );
+				$viewLink = $this->linkRenderer->makeLink( $title );
+				if ( !$title->quickUserCan( 'edit', $this->getUser() ) ) {
+					return $viewLink;
+				}
+				$editLink = $this->linkRenderer->makeLink(
+					$title,
+					$this->msg( 'linker-page-edit' )->text(),
+					[],
+					[ 'action' => 'edit', 'lintid' => $lintError->lintId, ]
+				);
+
+				return $this->msg( 'linker-page-title-edit' )->rawParams( $viewLink, $editLink )->escaped();
+			case 'details':
+				if ( $this->category === 'obsolete-tag' && isset( $lintError->params['name'] ) ) {
+					return Html::element( 'code', [], $lintError->params['name'] );
+				} elseif ( $this->category === 'bogus-image-options' && isset( $lintError->params['items'] ) ) {
+					$list = array_map( function( $in ) {
+						return Html::element( 'code', [], $in );
+					}, $lintError->params['items'] );
+					return $this->getLanguage()->commaList( $list );
+				}
+				return '';
+			case 'template':
+				if ( !$lintError->templateInfo ) {
+					return '&mdash;';
+				}
+				$templateName = $lintError->templateInfo['name'];
+				$templateTitle = Title::newFromText( $templateName, NS_TEMPLATE );
+				if ( !$templateTitle ) {
+					// Shouldn't be possible...???
+					return '&mdash';
+				}
+
+				return $this->linkRenderer->makeLink(
+					$templateTitle
+				);
+			default:
+				throw new InvalidArgumentException( "Unexpected name: $name" );
+		}
+	}
+
+	public function getDefaultSort() {
+		return 'linter_id';
+	}
+
+	public function getFieldNames() {
+		$names = [
+			'title' => $this->msg( 'linter-pager-title' ),
+		];
+		if ( $this->category !== 'fostered' ) {
+			// TODO: don't hardcode list of stuff with no parameters...?
+			$names['details'] = $this->msg( "linter-pager-{$this->category}-details" );
+		}
+		$names['template'] = $this->msg( "linter-pager-template" );
+		return $names;
+	}
+}

includes/SpecialLintErrors.php

@@ -0,0 +1,88 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+namespace MediaWiki\Linter;
+
+use Html;
+use SpecialPage;
+
+class SpecialLintErrors extends SpecialPage {
+
+	private $category;
+
+	public function __construct() {
+		parent::__construct( 'LintErrors' );
+	}
+
+	/**
+	 * @return array
+	 */
+	private function getCategories() {
+		global $wgLinterCategories;
+		return array_keys( array_filter( $wgLinterCategories ) );
+	}
+
+	public function execute( $par ) {
+		$this->setHeaders();
+		$this->outputHeader();
+		$cats = $this->getCategories();
+		if ( in_array( $par, $cats ) ) {
+			$this->category = $par;
+		}
+
+		if ( !$this->category ) {
+			$this->addHelpLink( 'Help:Extension:Linter' );
+			$this->showCategoryList( $cats );
+		} else {
+			$this->addHelpLink( "Help:Extension:Linter/{$this->category}" );
+			$out = $this->getOutput();
+			$out->setPageTitle(
+				$this->msg( 'linterrors-subpage',
+					$this->msg( "linter-category-{$this->category}" )->text()
+				)
+			);
+			$out->addBacklinkSubtitle( $this->getPageTitle() );
+			$out->addWikiMsg( "linter-category-{$this->category}-desc" );
+			$pager = new LintErrorsPager(
+				$this->getContext(), $this->category, $this->getLinkRenderer()
+			);
+			$out->addParserOutput( $pager->getFullOutput() );
+		}
+	}
+
+	private function showCategoryList( array $cats ) {
+		$linkRenderer = $this->getLinkRenderer();
+		$html = Html::openElement( 'ul' ) . "\n";
+		sort( $cats );
+		foreach ( $cats as $cat ) {
+			$html .= Html::rawElement( 'li', [], $linkRenderer->makeKnownLink(
+				$this->getPageTitle( $cat ),
+				$this->msg( "linter-category-$cat" )->text()
+			) ) . "\n";
+		}
+		$html .= Html::closeElement( 'ul' );
+		$this->getOutput()->addHTML( $html );
+	}
+
+	public function getGroupName() {
+		return 'maintenance';
+	}
+
+}

linter.sql

@@ -0,0 +1,13 @@
+CREATE TABLE /*_*/linter (
+	-- primary key
+	linter_id int UNSIGNED AUTO_INCREMENT PRIMARY KEY not null,
+	-- page id
+	linter_page int UNSIGNED not null,
+	-- error category
+	linter_cat VARCHAR(30) not null,
+	-- extra parameters about the error, JSON encoded
+	linter_params blob NOT NULL
+) /*$wgDBTableOptions*/;
+
+-- Query by page
+CREATE INDEX /*i*/linter_page ON /*_*/linter (linter_page);

modules/ext.linter.edit.js

@@ -0,0 +1,8 @@
+( function ( mw, $ ) {
+	$( function () {
+		var location = mw.config.get( 'wgLinterErrorLocation' );
+		if ( location ) {
+			$( '#wpTextbox1' ).focus().textSelection( 'setSelection', { start: location[ 0 ], end: location[ 1 ] } );
+		}
+	} );
+}( mediaWiki, jQuery ) );

package.json

@@ -0,0 +1,13 @@
+{
+  "scripts": {
+    "test": "grunt test"
+  },
+  "devDependencies": {
+    "grunt": "0.4.5",
+    "grunt-cli": "0.1.13",
+    "grunt-contrib-jshint": "0.11.3",
+    "grunt-banana-checker": "0.4.0",
+    "grunt-jscs": "2.2.0",
+    "grunt-jsonlint": "1.0.7"
+  }
+}

phpcs.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<ruleset>
+	<rule ref="vendor/mediawiki/mediawiki-codesniffer/MediaWiki"/>
+	<file>.</file>
+	<rule ref="MediaWiki.Commenting.FunctionComment.Missing">
+		<severity>0</severity>
+	</rule>
+	<rule ref="MediaWiki.Commenting.FunctionComment.MissingParamComment">
+		<severity>0</severity>
+	</rule>
+	<arg name="extensions" value="php,php5,inc"/>
+	<arg name="encoding" value="utf8"/>
+	<exclude-pattern>vendor</exclude-pattern>
+</ruleset>