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Tool for leetcode.com

This tool shows tables on database problems after you submit a wrong answer, so you don't need to read their unreadable JSON representation of tables.

  1. // ==UserScript==
  2. // @name            Tool for leetcode.com
  3. // @match           https://leetcode.com/problems/*
  4. // @match           https://leetcode.com/submissions/detail/*
  5. // @description     This tool shows tables on database problems after you submit a wrong answer, so you don't need to read their unreadable JSON representation of tables.
  6. // @version         1.3
  7. // @git             f890188d315661aae24c2b05abfb6feac286c9fe
  8. // @namespace https://greatest.deepsurf.us/users/7949
  9. // ==/UserScript==
  10.  
  11. // @todo table sorting, diff functionality
  12.  
  13.  
  14. (function () {
  15.  
  16.     // dependancies inserted here
  17.  
  18.     // BEGIN INCLUDE sql_table.js
  19.     /**
  20.      * @file This module works with leetcode's json representable of tables.
  21.      */
  22.  
  23.     var sql_table = (function ( factory ) {
  24.         var modulize = function ( factory, args ) {
  25.             var callable = function () {
  26.                 return modulize( factory, arguments );
  27.             };
  28.  
  29.             var obj = factory.apply( null, args );
  30.             for ( var prop in obj ) {
  31.                 if ( obj.hasOwnProperty( prop ) ) {
  32.                     callable[ prop ] = obj[ prop ];
  33.                 }
  34.             }
  35.  
  36.             return callable;
  37.         };
  38.  
  39.         return function () {
  40.             return modulize( factory, arguments );
  41.         }
  42.     })( function ( $, _ ) {
  43.  
  44.         /**
  45.          @typedef {Object} Table
  46.          @property {string}     name    The name of table
  47.          @property {string[]}   headers List of headers
  48.          @property {Array[]}    values  Rows of table
  49.          */
  50.  
  51.  
  52.         /**
  53.          * Create table element from a leetcode json
  54.          * @param {Table} obj   Parsed json from "output" or "expected" field
  55.          * @returns {jQuery}    The table object
  56.          */
  57.         var create_table_elem = function ( obj ) {
  58.  
  59.             /**
  60.              * Return the HTML representation of value wrap in <td>
  61.              * @param value
  62.              * @return {jQuery}
  63.              */
  64.             var repr_cell = function ( value ) {
  65.                 if ( _.isNull( value ) ) {
  66.                     return $( '<td>' )
  67.                         .append( $( '<em>' ).text( 'NULL' ) );
  68.                 } else if ( _.isString( value ) ) {
  69.                     return $( '<td>' ).text( JSON.stringify( value ) );
  70.                 } else if ( _.isNumber( value ) ) {
  71.                     return $( '<td>' )
  72.                         .text( value )
  73.                         .css( 'text-align', 'right' );
  74.                 } else {
  75.                     // unknown type
  76.                     return $( '<td>' ).text( value );
  77.                 }
  78.             };
  79.  
  80.             /**
  81.              * Wrap a list of text with tag
  82.              * @param {string[]}    arr
  83.              * @param {string}      tag
  84.              * @returns {jQuery[]}  Array of wrapping element
  85.              */
  86.             var wrap_text = function ( arr, tag ) {
  87.                 return _( arr ).map( function ( txt ) {
  88.                     return $( tag ).text( txt );
  89.                 } );
  90.             };
  91.  
  92.             return $( '<table>' )
  93.                 .append( $( '<caption>' ).text( obj.name ) )
  94.                 .append( $( '<thead>' )
  95.                     .append( $( '<tr>' ).append( wrap_text( obj.headers, '<th>' ) ) ) )
  96.                 .append( $( '<tbody>' )
  97.                     .append( _( obj.values ).map( function ( row ) {
  98.                         return $( '<tr>' ).append( _( row ).map( repr_cell ) );
  99.                     } ) ) );
  100.         };
  101.  
  102.  
  103.         /**
  104.          * Split the input json from leetcode to multiple table objects
  105.          * @param {Object}                    obj           Parsed json from "input" field
  106.          * @param {Object.<string, string[]>} obj.headers   Table name -> list of headers
  107.          * @param {Object.<string, Array>}    obj.rows      Table name -> list of rows
  108.          * @returns {Object.<string, Table>}                Table name -> table object
  109.          */
  110.         var split_input_table = function ( obj ) {
  111.             var tables = {};
  112.             _( obj.headers ).each( function ( headers, table_name ) {
  113.                 var table = {};
  114.                 table.name = table_name;
  115.                 table.headers = headers;
  116.                 table.values = obj.rows[ table_name ];
  117.                 tables[ table_name ] = table;
  118.             } );
  119.  
  120.             return tables;
  121.         };
  122.  
  123.  
  124.         return {
  125.             create_table_elem: create_table_elem,
  126.             split_input_table: split_input_table
  127.         };
  128.     } );
  129.     // END INCLUDE sql_table.js
  130.  
  131.  
  132.     // BEGIN INCLUDE bootstrap.js
  133.     /**
  134.      * @file Dependancy loader for user scripts.
  135.      */
  136.  
  137.  
  138.     // ref: https://gist.github.com/cyranix/6180495
  139.  
  140.     /**
  141.      * @typedef {Object}    JSModule
  142.      * @property {string}   url
  143.      * @property {Function} has
  144.      * @property {Function} get
  145.      */
  146.  
  147.     /**
  148.      * Dependancy loader for user scripts.
  149.      * @param {Function}    main                Main function of a user script,
  150.      *                                              call with loaded js modules
  151.      * @param {Object}      opts                Required JS, CSS
  152.      * @param {JSModule[]}  [opts.modules=[]]   Array of JS module specifiers
  153.      * @param {string[]}    [opts.css=[]]       Array of URLs to CSS dependencies
  154.      */
  155.     var bootstrap = function ( main, opts ) {
  156.         /**
  157.          * Load a js url and invoke callback
  158.          * @param {string}      url
  159.          * @param {function}    callback
  160.          */
  161.         var load_js = function ( url, callback ) {
  162.             var script = document.createElement( 'script' );
  163.             script.src = url;
  164.             script.addEventListener( 'load', callback );
  165.             document.body.appendChild( script );
  166.         };
  167.  
  168.         /**
  169.          * Load a list of css urls
  170.          * @param {string[]} url_list
  171.          */
  172.         var load_css_multi = function ( url_list ) {
  173.             while ( url_list.length > 0 ) {
  174.                 var head = document.getElementsByTagName( 'head' )[ 0 ];
  175.                 var link = document.createElement( 'link' );
  176.                 link.rel = 'stylesheet';
  177.                 link.type = 'text/css';
  178.                 link.href = url_list.shift();
  179.                 link.media = 'all';
  180.                 head.appendChild( link );
  181.             }
  182.         };
  183.  
  184.         /**
  185.          * Load a list of JS modules and invoke callback with a list of loaded module objects
  186.          * @param {JSModule[]}  mod_list
  187.          * @param {Function}    done
  188.          * @param {Object[]}    [loaded]
  189.          */
  190.         var load_js_modules = function ( mod_list, done, loaded ) {
  191.             loaded = loaded || [];
  192.             if ( mod_list.length > 0 ) {
  193.                 var mod_specifier = mod_list.shift();
  194.                 var existed = mod_specifier.has();
  195.                 if ( existed ) {
  196.                     loaded.push( existed );
  197.                     load_js_modules( mod_list, done, loaded );
  198.                 } else {
  199.                     load_js( mod_specifier.url, function () {
  200.                         loaded.push( mod_specifier.get() );
  201.                         load_js_modules( mod_list, done, loaded );
  202.                     } );
  203.                 }
  204.             } else {
  205.                 done( loaded );
  206.             }
  207.         };
  208.  
  209.         var load_all = function () {
  210.             var css_urls = opts.css || {};
  211.             var modules = opts.modules || [];
  212.  
  213.             load_css_multi( css_urls );
  214.             load_js_modules( modules, function ( mod_objs ) {
  215.                 // start main function
  216.                 main.apply( null, mod_objs );
  217.             } );
  218.         };
  219.  
  220.         load_all();
  221.     };
  222.     // END INCLUDE bootstrap.js
  223.  
  224.  
  225.     // BEGIN INCLUDE main.js
  226.     /**
  227.      * @file Main function of this user script
  228.      */
  229.  
  230.     // Arguments correspond to the dependency references.
  231.     // @see {@link bootstrap} for further information.
  232.     var main = function ( $, _, sql_table ) {
  233.         // Is this a sql problem or sql submission
  234.         var has_sql = $( '*[ng-switch-when=mysql]' ).length > 0 // sql problem
  235.             || (window.pageData && window.pageData.getLangDisplay === 'mysql'); // sql submission
  236.         if ( !has_sql ) {
  237.             return;
  238.         }
  239.  
  240.         // load sql_table module
  241.         sql_table = sql_table( $, _ );
  242.  
  243.         // get json from these elements
  244.         var input_id = '#result_wa_testcase_input';
  245.         var output_id = '#result_wa_testcase_output';
  246.         var expected_id = '#result_wa_testcase_expected';
  247.         var last_exe_id = '#last_executed_testcase_output';
  248.  
  249.         // styles for table
  250.         var table_classes = [ 'pure-table', 'pure-table-bordered', 'pure-table-striped' ];
  251.  
  252.         /**
  253.          * Create table element from "input" field
  254.          * @param {jQuery} el
  255.          * @return {jQuery[]} Array of table element
  256.          */
  257.         var get_input_tables = function ( el ) {
  258.             // workaround: leetcode is replacing ',' with '\n'
  259.             var json = JSON.parse( el.text().replace( /\n/g, ', ' ) );
  260.             return _( sql_table.split_input_table( json ) ).map( function ( table ) {
  261.                 return sql_table.create_table_elem( table )
  262.                     .addClass( table_classes.join( ' ' ) );
  263.             } );
  264.         };
  265.  
  266.         /**
  267.          * Create table element from "output" or "expected" field
  268.          * @param {jQuery} el
  269.          * @return {jQuery} The table element
  270.          */
  271.         var get_output_table = function ( el ) {
  272.             var json = JSON.parse( el.text() );
  273.             return sql_table.create_table_elem( json )
  274.                 .addClass( table_classes.join( ' ' ) );
  275.         };
  276.  
  277.         /**
  278.          * Render tables after "Wrong Answer" encountered.
  279.          */
  280.         var show_table = function () {
  281.             var table_ctn = $( '<div>' )
  282.                 .append( '<hr>' )
  283.                 .append( $( '<div>' ).text( 'Inputs:' ) )
  284.                 .append( get_input_tables( $( input_id ) ) )
  285.  
  286.                 .append( '<hr>' )
  287.                 .append( $( '<div class="pure-g">' )
  288.                     .append( $( '<div class="pure-u-1-2">' )
  289.                         .css( { color: 'red' } )
  290.                         .append( $( '<div>' ).text( 'Output:' ) )
  291.                         .append( get_output_table( $( output_id ) ) ) )
  292.                     .append( $( '<div class="pure-u-1-2">' )
  293.                         .css( { color: 'green' } )
  294.                         .append( $( '<div>' ).text( 'Expected:' ) )
  295.                         .append( get_output_table( $( expected_id ) ) ) ) );
  296.  
  297.             var wa_output = $( '#wa_output' );
  298.             // remove prevous tables
  299.             wa_output.children().first().nextAll().remove();
  300.             wa_output.append( table_ctn );
  301.         };
  302.  
  303.         /**
  304.          * Render tables after "Runtime Error" encountered.
  305.          */
  306.         var show_le_table = function () {
  307.             var table_ctn = $( '<div>' )
  308.                 .append( '<hr>' )
  309.                 .append( $( '<div>' ).text( 'Inputs:' ) )
  310.                 .append( get_input_tables( $( last_exe_id ) ) );
  311.  
  312.             var last_exe = $( '#last_executed_testcase_output_row' );
  313.             // remove prevous tables
  314.             last_exe.children().first().nextAll().remove();
  315.             last_exe.append( table_ctn );
  316.         };
  317.  
  318.         var create_show_table_btn = function () {
  319.             var btn = $( '<button>' )
  320.                 .text( 'Tablize!' )
  321.                 .addClass( 'pure-button' )
  322.                 .css( { 'margin-left': '16px' } )
  323.                 .click( function () {
  324.                     show_table();
  325.                 } );
  326.             $( '#more-details' ).after( btn );
  327.         };
  328.  
  329.         /**
  330.          * Invoke callback when element is visible. Using MutationObserver
  331.          * @param {jQuery} elem
  332.          * @param {function} func
  333.          */
  334.         var setup_observer = function ( elem, func ) {
  335.             var on_attr_changes = function () {
  336.                 if ( elem.is( ':visible' ) ) {
  337.                     func();
  338.                 }
  339.             };
  340.  
  341.             // elem may be visible already
  342.             on_attr_changes();
  343.             // observe style attribute changes
  344.             var observer = new MutationObserver( on_attr_changes );
  345.             observer.observe( elem.get( 0 ), { attributes: true } );
  346.         };
  347.  
  348.         /**
  349.          * Invoke callback when element is visible. Using setInterval()
  350.          * @param {jQuery} elem
  351.          * @param {function} func
  352.          */
  353.         var setup_poller = function ( elem, func ) {
  354.             var is_showing = false;
  355.             var check = function () {
  356.                 if ( elem.is( ':visible' ) ) {
  357.                     if ( !is_showing ) {
  358.                         func();
  359.                         is_showing = true;
  360.                     }
  361.                 } else {
  362.                     is_showing = false;
  363.                 }
  364.             };
  365.  
  366.             window.setInterval( check, 500 );
  367.         };
  368.  
  369.         var setup;
  370.         if ( !window.MutationObserver ) {
  371.             setup = setup_poller;
  372.         } else {
  373.             setup = setup_observer;
  374.         }
  375.  
  376.         // show tables after wrong answer appeared
  377.         setup( $( '#wa_output' ), show_table );
  378.         // show tables after a runtime errer
  379.         setup( $( '#last_executed_testcase_output_row' ), show_le_table );
  380.     };
  381.     // END INCLUDE main.js
  382.  
  383.  
  384.     bootstrap( main, {
  385.         modules: [ {
  386.             // jQuery
  387.             url: '//cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js',
  388.             has: function () {
  389.                 return window.jQuery;
  390.             },
  391.             get: function () {
  392.                 return window.$.noConflict();
  393.             }
  394.         }, {
  395.             // underscore
  396.             url: '//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js',
  397.             has: function () {
  398.                 return undefined;
  399.             },
  400.             get: function () {
  401.                 return window._.noConflict();
  402.             }
  403.         }, {
  404.             // sql_table
  405.             has: function () {
  406.                 return sql_table;   // direct reference
  407.             }
  408.         } ],
  409.         css: [
  410.             // pure.css
  411.             '//cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/pure-min.css'
  412.         ]
  413.     } );
  414.  
  415. })();