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left_rec.html
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<!DOCTYPE html>
<html>
<head>
<title>Elimination of Left Recursion</title>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
<meta name="google-site-verification" content="tXyJhIUjwgDkdY4scPFF1nBiVW9co3-HjowXazdoL7I" />
<link rel="stylesheet" href="./lib/css/bootstrap.min.css">
<link rel="stylesheet" href="./lib/css/ripples.min.css">
<link rel="stylesheet" href="./lib/css/bootstrap-material-design.min.css">
<link rel="stylesheet" href="./css/toolbox.css">
<link rel="stylesheet" href="./css/left_rec.css">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/toolbox">Toolbox</a>
</div>
<div id="navbar" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="/toolbox">Home</a></li>
<li><a href="https://github.com/CyberZHG/toolbox">Repository</a></li>
<li><a href="https://github.com/CyberZHG/toolbox/issues">Issues</a></li>
</ul>
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<li>
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<a href="https://github.com/CyberZHG/toolbox/issues">
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</li>
</ul>
</div>
</div>
</nav>
<div class="container-fluid container-body">
<!-- Body Begin -->
<div class="row">
<span class="col-md-2">
<div class="well">
<h4>Introduction</h4>
<hr>
<p>
Try to perform the elimination of left recursion, the input grammar should have no cycles or ϵ-productions.
</p>
</div>
</span>
<span class="col-md-5">
<div class="well">
<h4>Supported grammars</h4>
<ul>
<li>A -> A c | A a d | b d | ϵ <br>(All tokens must be separated by space characters)</li>
<li>A -> A c <br> | A a d <br> | b d <br> | ϵ </li>
<li>S -> A a | b<br>A -> A c | S d | ϵ</li>
<li>(Copy ϵ to input if needed)</li>
</ul>
</div>
</span>
<span class="col-md-5">
<div class="well">
<h4>Examples</h4>
<ul>
<li>S -> S S + | S S * | a</li>
<li>S -> 0 S 1 | 0 1</li>
<li>S -> + S S | * S S | a</li>
<li>S -> S ( S ) S | ϵ</li>
<li>S -> S + S | S S | ( S ) | S * | a</li>
<li>S -> ( L ) | a L -> L , S | S</li>
<li>S -> a S b S | b S a S | ϵ</li>
<li>
bexpr -> bexpr or bterm | bterm <br>
bterm -> bterm and bfactor | bfactor <br>
bfactor -> not bfactor | ( bexpr ) | true | false
</li>
</ul>
</div>
</span>
</div>
<div class="row">
<div class="form-group">
<label for="input_grammar" class="col-md-1 control-label">Input: </label>
<div class="col-md-11">
<textarea type="text" class="form-control" id="input_grammar" rows="10" placeholder="A -> A c | A a d | b d | ϵ"></textarea>
</div>
</div>
</div>
<div class="row">
<div class="col-md-offset-10 col-md-2">
<button id="button_convert" class="btn btn-raised btn-block btn-primary">Convert</button>
</div>
</div>
<div id="alert_error" class="alert alert-dismissible alert-danger" hidden>
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Invalid Grammar</strong>
<p id="p_error"></p>
</div>
<div class="row">
<div class="form-group">
<label for="output_grammar" class="col-md-1 control-label">Output: </label>
<div class="col-md-11">
<textarea type="text" class="form-control" id="output_grammar" rows="10" readonly></textarea>
</div>
</div>
</div>
<div class="row">
<div class="form-group">
<label for="input_url" class="col-md-1 control-label">URL: </label>
<div class="col-md-11">
<input type="text" class="form-control" id="input_url" readonly>
</div>
</div>
</div>
<script src="./js/syntax.js"></script>
<!-- Body End -->
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<script src="./js/left_rec.js"></script>
<script>
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$.material.init();
});
</script>
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