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.
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// ==UserScript==
// @name Tool for leetcode.com
// @match https://leetcode.com/problems/*
// @match https://leetcode.com/submissions/detail/*
// @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.
// @version 1.3
// @git f890188d315661aae24c2b05abfb6feac286c9fe
// @namespace https://greatest.deepsurf.us/users/7949
// ==/UserScript==
// @todo table sorting, diff functionality
(function () {
// dependancies inserted here
// BEGIN INCLUDE sql_table.js
/**
* @file This module works with leetcode's json representable of tables.
*/
var sql_table = (function ( factory ) {
var modulize = function ( factory, args ) {
var callable = function () {
return modulize( factory, arguments );
};
var obj = factory.apply( null, args );
for ( var prop in obj ) {
if ( obj.hasOwnProperty( prop ) ) {
callable[ prop ] = obj[ prop ];
}
}
return callable;
};
return function () {
return modulize( factory, arguments );
}
})( function ( $, _ ) {
/**
@typedef {Object} Table
@property {string} name The name of table
@property {string[]} headers List of headers
@property {Array[]} values Rows of table
*/
/**
* Create table element from a leetcode json
* @param {Table} obj Parsed json from "output" or "expected" field
* @returns {jQuery} The table object
*/
var create_table_elem = function ( obj ) {
/**
* Return the HTML representation of value wrap in <td>
* @param value
* @return {jQuery}
*/
var repr_cell = function ( value ) {
if ( _.isNull( value ) ) {
return $( '<td>' )
.append( $( '<em>' ).text( 'NULL' ) );
} else if ( _.isString( value ) ) {
return $( '<td>' ).text( JSON.stringify( value ) );
} else if ( _.isNumber( value ) ) {
return $( '<td>' )
.text( value )
.css( 'text-align', 'right' );
} else {
// unknown type
return $( '<td>' ).text( value );
}
};
/**
* Wrap a list of text with tag
* @param {string[]} arr
* @param {string} tag
* @returns {jQuery[]} Array of wrapping element
*/
var wrap_text = function ( arr, tag ) {
return _( arr ).map( function ( txt ) {
return $( tag ).text( txt );
} );
};
return $( '<table>' )
.append( $( '<caption>' ).text( obj.name ) )
.append( $( '<thead>' )
.append( $( '<tr>' ).append( wrap_text( obj.headers, '<th>' ) ) ) )
.append( $( '<tbody>' )
.append( _( obj.values ).map( function ( row ) {
return $( '<tr>' ).append( _( row ).map( repr_cell ) );
} ) ) );
};
/**
* Split the input json from leetcode to multiple table objects
* @param {Object} obj Parsed json from "input" field
* @param {Object.<string, string[]>} obj.headers Table name -> list of headers
* @param {Object.<string, Array>} obj.rows Table name -> list of rows
* @returns {Object.<string, Table>} Table name -> table object
*/
var split_input_table = function ( obj ) {
var tables = {};
_( obj.headers ).each( function ( headers, table_name ) {
var table = {};
table.name = table_name;
table.headers = headers;
table.values = obj.rows[ table_name ];
tables[ table_name ] = table;
} );
return tables;
};
return {
create_table_elem: create_table_elem,
split_input_table: split_input_table
};
} );
// END INCLUDE sql_table.js
// BEGIN INCLUDE bootstrap.js
/**
* @file Dependancy loader for user scripts.
*/
// ref: https://gist.github.com/cyranix/6180495
/**
* @typedef {Object} JSModule
* @property {string} url
* @property {Function} has
* @property {Function} get
*/
/**
* Dependancy loader for user scripts.
* @param {Function} main Main function of a user script,
* call with loaded js modules
* @param {Object} opts Required JS, CSS
* @param {JSModule[]} [opts.modules=[]] Array of JS module specifiers
* @param {string[]} [opts.css=[]] Array of URLs to CSS dependencies
*/
var bootstrap = function ( main, opts ) {
/**
* Load a js url and invoke callback
* @param {string} url
* @param {function} callback
*/
var load_js = function ( url, callback ) {
var script = document.createElement( 'script' );
script.src = url;
script.addEventListener( 'load', callback );
document.body.appendChild( script );
};
/**
* Load a list of css urls
* @param {string[]} url_list
*/
var load_css_multi = function ( url_list ) {
while ( url_list.length > 0 ) {
var head = document.getElementsByTagName( 'head' )[ 0 ];
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = url_list.shift();
link.media = 'all';
head.appendChild( link );
}
};
/**
* Load a list of JS modules and invoke callback with a list of loaded module objects
* @param {JSModule[]} mod_list
* @param {Function} done
* @param {Object[]} [loaded]
*/
var load_js_modules = function ( mod_list, done, loaded ) {
loaded = loaded || [];
if ( mod_list.length > 0 ) {
var mod_specifier = mod_list.shift();
var existed = mod_specifier.has();
if ( existed ) {
loaded.push( existed );
load_js_modules( mod_list, done, loaded );
} else {
load_js( mod_specifier.url, function () {
loaded.push( mod_specifier.get() );
load_js_modules( mod_list, done, loaded );
} );
}
} else {
done( loaded );
}
};
var load_all = function () {
var css_urls = opts.css || {};
var modules = opts.modules || [];
load_css_multi( css_urls );
load_js_modules( modules, function ( mod_objs ) {
// start main function
main.apply( null, mod_objs );
} );
};
load_all();
};
// END INCLUDE bootstrap.js
// BEGIN INCLUDE main.js
/**
* @file Main function of this user script
*/
// Arguments correspond to the dependency references.
// @see {@link bootstrap} for further information.
var main = function ( $, _, sql_table ) {
// Is this a sql problem or sql submission
var has_sql = $( '*[ng-switch-when=mysql]' ).length > 0 // sql problem
|| (window.pageData && window.pageData.getLangDisplay === 'mysql'); // sql submission
if ( !has_sql ) {
return;
}
// load sql_table module
sql_table = sql_table( $, _ );
// get json from these elements
var input_id = '#result_wa_testcase_input';
var output_id = '#result_wa_testcase_output';
var expected_id = '#result_wa_testcase_expected';
var last_exe_id = '#last_executed_testcase_output';
// styles for table
var table_classes = [ 'pure-table', 'pure-table-bordered', 'pure-table-striped' ];
/**
* Create table element from "input" field
* @param {jQuery} el
* @return {jQuery[]} Array of table element
*/
var get_input_tables = function ( el ) {
// workaround: leetcode is replacing ',' with '\n'
var json = JSON.parse( el.text().replace( /\n/g, ', ' ) );
return _( sql_table.split_input_table( json ) ).map( function ( table ) {
return sql_table.create_table_elem( table )
.addClass( table_classes.join( ' ' ) );
} );
};
/**
* Create table element from "output" or "expected" field
* @param {jQuery} el
* @return {jQuery} The table element
*/
var get_output_table = function ( el ) {
var json = JSON.parse( el.text() );
return sql_table.create_table_elem( json )
.addClass( table_classes.join( ' ' ) );
};
/**
* Render tables after "Wrong Answer" encountered.
*/
var show_table = function () {
var table_ctn = $( '<div>' )
.append( '<hr>' )
.append( $( '<div>' ).text( 'Inputs:' ) )
.append( get_input_tables( $( input_id ) ) )
.append( '<hr>' )
.append( $( '<div class="pure-g">' )
.append( $( '<div class="pure-u-1-2">' )
.css( { color: 'red' } )
.append( $( '<div>' ).text( 'Output:' ) )
.append( get_output_table( $( output_id ) ) ) )
.append( $( '<div class="pure-u-1-2">' )
.css( { color: 'green' } )
.append( $( '<div>' ).text( 'Expected:' ) )
.append( get_output_table( $( expected_id ) ) ) ) );
var wa_output = $( '#wa_output' );
// remove prevous tables
wa_output.children().first().nextAll().remove();
wa_output.append( table_ctn );
};
/**
* Render tables after "Runtime Error" encountered.
*/
var show_le_table = function () {
var table_ctn = $( '<div>' )
.append( '<hr>' )
.append( $( '<div>' ).text( 'Inputs:' ) )
.append( get_input_tables( $( last_exe_id ) ) );
var last_exe = $( '#last_executed_testcase_output_row' );
// remove prevous tables
last_exe.children().first().nextAll().remove();
last_exe.append( table_ctn );
};
var create_show_table_btn = function () {
var btn = $( '<button>' )
.text( 'Tablize!' )
.addClass( 'pure-button' )
.css( { 'margin-left': '16px' } )
.click( function () {
show_table();
} );
$( '#more-details' ).after( btn );
};
/**
* Invoke callback when element is visible. Using MutationObserver
* @param {jQuery} elem
* @param {function} func
*/
var setup_observer = function ( elem, func ) {
var on_attr_changes = function () {
if ( elem.is( ':visible' ) ) {
func();
}
};
// elem may be visible already
on_attr_changes();
// observe style attribute changes
var observer = new MutationObserver( on_attr_changes );
observer.observe( elem.get( 0 ), { attributes: true } );
};
/**
* Invoke callback when element is visible. Using setInterval()
* @param {jQuery} elem
* @param {function} func
*/
var setup_poller = function ( elem, func ) {
var is_showing = false;
var check = function () {
if ( elem.is( ':visible' ) ) {
if ( !is_showing ) {
func();
is_showing = true;
}
} else {
is_showing = false;
}
};
window.setInterval( check, 500 );
};
var setup;
if ( !window.MutationObserver ) {
setup = setup_poller;
} else {
setup = setup_observer;
}
// show tables after wrong answer appeared
setup( $( '#wa_output' ), show_table );
// show tables after a runtime errer
setup( $( '#last_executed_testcase_output_row' ), show_le_table );
};
// END INCLUDE main.js
bootstrap( main, {
modules: [ {
// jQuery
url: '//cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js',
has: function () {
return window.jQuery;
},
get: function () {
return window.$.noConflict();
}
}, {
// underscore
url: '//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js',
has: function () {
return undefined;
},
get: function () {
return window._.noConflict();
}
}, {
// sql_table
has: function () {
return sql_table; // direct reference
}
} ],
css: [
// pure.css
'//cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/pure-min.css'
]
} );
})();