toolbox/first_follow.html at gh-pages · CyberZHG/toolbox · GitHub

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<!DOCTYPE html>

<html>

<head>

<title>First & Follow</title>

<meta charset="UTF-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge" />

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<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/first_follow.css">

</head>

<body>

<nav class="navbar navbar-default navbar-fixed-top">

<div class="container">

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<li class="active"><a href="/toolbox">Home</a></li>

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<div class="container-fluid container-body">

<div class="row">

<span class="col-md-2">

<div class="well">

<h4>Introduction</h4>

<hr>

<p>

Compute first and follow set.

</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_compute" class="btn btn-raised btn-block btn-primary">Compute</button>

</div>

</div>

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<button type="button" class="close" data-dismiss="alert">×</button>

<strong>Invalid Grammar</strong>

<p id="p_error"></p>

</div>

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</div>

</div>

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<div class="form-group">

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<div class="col-md-11">

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</div>

</div>

</div>

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