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slrjs.html
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slrjs.html
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<!--
/*
* The MIT License
*
* Copyright 2011 Greg.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-->
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1252">
<title>SLR Parser Generator</title>
<style>
body {
background-color: #F0F0F0;
}
body * {
font-family: courier;
}
td {
horizontal-align: middle;
vertical-align: top;
white-space: nowrap;
}
th {
white-space: nowrap;
}
</style>
<script language="javascript" src="slrjs_files/underscore.js"></script>
<script language="javascript" src="slrjs_files/tools.js"></script>
<script language="javascript" src="slrjs_files/grammar.js"></script>
<script language="javascript" src="slrjs_files/grammarview.js"></script>
<script language="javascript" src="slrjs_files/slritem.js"></script>
<script language="javascript" src="slrjs_files/lrclosuretable.js"></script>
<script language="javascript" src="slrjs_files/lrclosuretableview.js"></script>
<script language="javascript" src="slrjs_files/tree.js"></script>
<script language="javascript" src="slrjs_files/treeview.js"></script>
<script language="javascript" src="slrjs_files/lrtable.js"></script>
<script language="javascript" src="slrjs_files/lrtableview.js"></script>
<script language="javascript" src="slrjs_files/lrparseview.js"></script>
</head>
<body data-new-gr-c-s-check-loaded="8.872.0" data-gr-ext-installed="">
<script language="javascript">
var lrTable;
function grammarChanged() {
displayRuleIndices();
var grammar = new Grammar($element('grammar').value);
var lrClosureTable = new LRClosureTable(grammar);
lrTable = new LRTable(lrClosureTable);
$element('firstFollowView').innerHTML = formatFirstFollow(grammar);
$element('lrClosureTableView').innerHTML = formatLRClosureTable(lrClosureTable);
$element('lrTableView').innerHTML = formatLRTable(lrTable);
parseInput();
}
</script>
<table>
<tbody>
<tr>
<td>
<div id="grammarView">
<div>SLR grammar ('' is ε):</div>
<table>
<tbody>
<tr>
<td><textarea
style="text-align: right; border: 0; color: green; background-color: #F0F0F0"
id="ruleIndices" rows="25" cols="3" readonly="true">(0)
(1)
(2)
(3)
(4)
(5)
(6)
</textarea></td>
<td><textarea id="grammar" rows="25" cols="20" onfocus="$('ruleIndices').value = ''"
onblur="displayRuleIndices();" onchange="grammarChanged();">E' -> E
E -> E + T
E -> T
T -> T * F
T -> F
F -> ( E )
F -> id
</textarea></td>
</tr>
</tbody>
</table>
</div>
<br>
<div id="firstFollowView">
<table border="1">
<thead>
<tr>
<th colspan="3">FIRST / FOLLOW table</th>
</tr>
<tr>
<th>Nonterminal</th>
<th>FIRST</th>
<th>FOLLOW</th>
</tr>
</thead>
<tbody>
<tr>
<td>E'</td>
<td>{(,id}</td>
<td>{$}</td>
</tr>
<tr>
<td>E</td>
<td>{(,id}</td>
<td>{$,+,)}</td>
</tr>
<tr>
<td>T</td>
<td>{(,id}</td>
<td>{$,+,*,)}</td>
</tr>
<tr>
<td>F</td>
<td>{(,id}</td>
<td>{$,+,*,)}</td>
</tr>
</tbody>
</table>
</div>
</td>
<td>
<br>
<input type="button" value="Process & Download JSON">
<br />
Note that only if there are changes will<br />the grammar be re-processed.
</td>
<td>
<div style="height: 100%; overflow: auto;">
<div id="lrClosureTableView">
<table border="1">
<thead>
<tr>
<th colspan="4">SLR closure table</th>
</tr>
<tr>
<th>Goto</th>
<th>Kernel</th>
<th>State</th>
<th>Closure</th>
</tr>
</thead>
<tbody id="lrClosureTableRows">
<tr>
<td></td>
<td>{E' -> .E}</td>
<td style="color: blue;">0</td>
<td>{E' -> .E; E -> .E + T; E -> .T; T -> .T * F; T -> .F; F
-> .( E ); F -> .id}</td>
</tr>
<tr>
<td>goto(0, E)</td>
<td>{<span style="color: green;">E' -> E.</span>; E -> E.+ T}</td>
<td style="color: blue;">1</td>
<td>{<span style="color: green;">E' -> E.</span>; E -> E.+ T}</td>
</tr>
<tr>
<td>goto(0, T)</td>
<td>{<span style="color: green;">E -> T.</span>; T -> T.* F}</td>
<td style="color: blue;">2</td>
<td>{<span style="color: green;">E -> T.</span>; T -> T.* F}</td>
</tr>
<tr>
<td>goto(0, F)</td>
<td>{<span style="color: green;">T -> F.</span>}</td>
<td style="color: blue;">3</td>
<td>{<span style="color: green;">T -> F.</span>}</td>
</tr>
<tr>
<td>goto(0, ()</td>
<td>{F -> (.E )}</td>
<td style="color: blue;">4</td>
<td>{F -> (.E ); E -> .E + T; E -> .T; T -> .T * F; T -> .F; F
-> .( E ); F -> .id}</td>
</tr>
<tr>
<td>goto(0, id)</td>
<td>{<span style="color: green;">F -> id.</span>}</td>
<td style="color: blue;">5</td>
<td>{<span style="color: green;">F -> id.</span>}</td>
</tr>
<tr>
<td>goto(1, +)</td>
<td>{E -> E +.T}</td>
<td style="color: blue;">6</td>
<td>{E -> E +.T; T -> .T * F; T -> .F; F -> .( E ); F -> .id}
</td>
</tr>
<tr>
<td>goto(2, *)</td>
<td>{T -> T *.F}</td>
<td style="color: blue;">7</td>
<td>{T -> T *.F; F -> .( E ); F -> .id}</td>
</tr>
<tr>
<td>goto(4, E)</td>
<td>{F -> ( E.); E -> E.+ T}</td>
<td style="color: blue;">8</td>
<td>{F -> ( E.); E -> E.+ T}</td>
</tr>
<tr>
<td>goto(4, T)</td>
<td>{<span style="color: green;">E -> T.</span>; T -> T.* F}</td>
<td style="color: blue;">2</td>
<td> </td>
</tr>
<tr>
<td>goto(4, F)</td>
<td>{<span style="color: green;">T -> F.</span>}</td>
<td style="color: blue;">3</td>
<td> </td>
</tr>
<tr>
<td>goto(4, ()</td>
<td>{F -> (.E )}</td>
<td style="color: blue;">4</td>
<td> </td>
</tr>
<tr>
<td>goto(4, id)</td>
<td>{<span style="color: green;">F -> id.</span>}</td>
<td style="color: blue;">5</td>
<td> </td>
</tr>
<tr>
<td>goto(6, T)</td>
<td>{<span style="color: green;">E -> E + T.</span>; T -> T.* F}</td>
<td style="color: blue;">9</td>
<td>{<span style="color: green;">E -> E + T.</span>; T -> T.* F}</td>
</tr>
<tr>
<td>goto(6, F)</td>
<td>{<span style="color: green;">T -> F.</span>}</td>
<td style="color: blue;">3</td>
<td> </td>
</tr>
<tr>
<td>goto(6, ()</td>
<td>{F -> (.E )}</td>
<td style="color: blue;">4</td>
<td> </td>
</tr>
<tr>
<td>goto(6, id)</td>
<td>{<span style="color: green;">F -> id.</span>}</td>
<td style="color: blue;">5</td>
<td> </td>
</tr>
<tr>
<td>goto(7, F)</td>
<td>{<span style="color: green;">T -> T * F.</span>}</td>
<td style="color: blue;">10</td>
<td>{<span style="color: green;">T -> T * F.</span>}</td>
</tr>
<tr>
<td>goto(7, ()</td>
<td>{F -> (.E )}</td>
<td style="color: blue;">4</td>
<td> </td>
</tr>
<tr>
<td>goto(7, id)</td>
<td>{<span style="color: green;">F -> id.</span>}</td>
<td style="color: blue;">5</td>
<td> </td>
</tr>
<tr>
<td>goto(8, ))</td>
<td>{<span style="color: green;">F -> ( E ).</span>}</td>
<td style="color: blue;">11</td>
<td>{<span style="color: green;">F -> ( E ).</span>}</td>
</tr>
<tr>
<td>goto(8, +)</td>
<td>{E -> E +.T}</td>
<td style="color: blue;">6</td>
<td> </td>
</tr>
<tr>
<td>goto(9, *)</td>
<td>{T -> T *.F}</td>
<td style="color: blue;">7</td>
<td> </td>
</tr>
</tbody>
</table>
</div>
<br>
<hr><br>
<table cellpadding="8" border="1">
<tbody>
<tr>
<td>
<div id="lrTableView">
<table border="1">
<thead>
<tr>
<th colspan="11">LR table</th>
</tr>
<tr>
<th rowspan="2">State</th>
<th rowspan="1" colspan="6">ACTION</th>
<th colspan="4">GOTO</th>
</tr>
<tr>
<th>+</th>
<th>*</th>
<th>(</th>
<th>)</th>
<th>id</th>
<th>$</th>
<th>E'</th>
<th>E</th>
<th>T</th>
<th>F</th>
</tr>
</thead>
<tbody>
<tr>
<td style="color: blue;">0</td>
<td> </td>
<td> </td>
<td>s<span style="color: blue;">4</span></td>
<td> </td>
<td>s<span style="color: blue;">5</span></td>
<td> </td>
<td> </td>
<td><span style="color: blue;">1</span></td>
<td><span style="color: blue;">2</span></td>
<td><span style="color: blue;">3</span></td>
</tr>
<tr>
<td style="color: blue;">1</td>
<td>s<span style="color: blue;">6</span></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td><span style="color: green;">acc</span></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td style="color: blue;">2</td>
<td>r<sub style="color: green;">2</sub></td>
<td>s<span style="color: blue;">7</span></td>
<td> </td>
<td>r<sub style="color: green;">2</sub></td>
<td> </td>
<td>r<sub style="color: green;">2</sub></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td style="color: blue;">3</td>
<td>r<sub style="color: green;">4</sub></td>
<td>r<sub style="color: green;">4</sub></td>
<td> </td>
<td>r<sub style="color: green;">4</sub></td>
<td> </td>
<td>r<sub style="color: green;">4</sub></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td style="color: blue;">4</td>
<td> </td>
<td> </td>
<td>s<span style="color: blue;">4</span></td>
<td> </td>
<td>s<span style="color: blue;">5</span></td>
<td> </td>
<td> </td>
<td><span style="color: blue;">8</span></td>
<td><span style="color: blue;">2</span></td>
<td><span style="color: blue;">3</span></td>
</tr>
<tr>
<td style="color: blue;">5</td>
<td>r<sub style="color: green;">6</sub></td>
<td>r<sub style="color: green;">6</sub></td>
<td> </td>
<td>r<sub style="color: green;">6</sub></td>
<td> </td>
<td>r<sub style="color: green;">6</sub></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td style="color: blue;">6</td>
<td> </td>
<td> </td>
<td>s<span style="color: blue;">4</span></td>
<td> </td>
<td>s<span style="color: blue;">5</span></td>
<td> </td>
<td> </td>
<td> </td>
<td><span style="color: blue;">9</span></td>
<td><span style="color: blue;">3</span></td>
</tr>
<tr>
<td style="color: blue;">7</td>
<td> </td>
<td> </td>
<td>s<span style="color: blue;">4</span></td>
<td> </td>
<td>s<span style="color: blue;">5</span></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td><span style="color: blue;">10</span></td>
</tr>
<tr>
<td style="color: blue;">8</td>
<td>s<span style="color: blue;">6</span></td>
<td> </td>
<td> </td>
<td>s<span style="color: blue;">11</span></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td style="color: blue;">9</td>
<td>r<sub style="color: green;">1</sub></td>
<td>s<span style="color: blue;">7</span></td>
<td> </td>
<td>r<sub style="color: green;">1</sub></td>
<td> </td>
<td>r<sub style="color: green;">1</sub></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td style="color: blue;">10</td>
<td>r<sub style="color: green;">3</sub></td>
<td>r<sub style="color: green;">3</sub></td>
<td> </td>
<td>r<sub style="color: green;">3</sub></td>
<td> </td>
<td>r<sub style="color: green;">3</sub></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td style="color: blue;">11</td>
<td>r<sub style="color: green;">5</sub></td>
<td>r<sub style="color: green;">5</sub></td>
<td> </td>
<td>r<sub style="color: green;">5</sub></td>
<td> </td>
<td>r<sub style="color: green;">5</sub></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
</div>
</td>
<td>
<div id="lrParseView">
<p>Input (tokens): <input id="input" type="text" size="12"
onkeyup="resize(this, 1);" onchange="parseInput();"
value="id + id * id" style="color: green;"></p>
<p>Maximum number of steps: <input id="maximumStepCount" type="text"
size="3" onkeyup="resize(this, 1);" onchange="parseInput();"
value="100" style="color: black;"></p>
<p><input type="button" value="PARSE"></p><br>
<table border="6">
<thead>
<tr>
<th colspan="4">Trace</th>
<th rowspan="2">Tree</th>
</tr>
<tr>
<th>Step</th>
<th>Stack</th>
<th>Input</th>
<th>Action</th>
</tr>
</thead>
<tbody id="traceAndTreeRows">
<tr>
<td>1</td>
<td><span style="color: blue;">0</span></td>
<td>id + id * id $</td>
<td>s<span style="color: blue;">5</span></td>
<td id="tree" style="vertical-align: top;" rowspan="24">
<table border="1">
<thead>
<tr>
<th colspan="3">E</th>
</tr>
</thead>
<tbody>
<tr>
<td style="vertical-align: top;">
<table border="1">
<thead>
<tr>
<th colspan="1">E</th>
</tr>
</thead>
<tbody>
<tr>
<td
style="vertical-align: top;">
<table border="1">
<thead>
<tr>
<th colspan="1">
T</th>
</tr>
</thead>
<tbody>
<tr>
<td
style="vertical-align: top;">
<table
border="1">
<thead>
<tr>
<th
colspan="1">
F
</th>
</tr>
</thead>
<tbody>
<tr>
<td
style="vertical-align: top;">
id
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
<td style="vertical-align: top;">+</td>
<td style="vertical-align: top;">
<table border="1">
<thead>
<tr>
<th colspan="3">T</th>
</tr>
</thead>
<tbody>
<tr>
<td
style="vertical-align: top;">
<table border="1">
<thead>
<tr>
<th colspan="1">
T</th>
</tr>
</thead>
<tbody>
<tr>
<td
style="vertical-align: top;">
<table
border="1">
<thead>
<tr>
<th
colspan="1">
F
</th>
</tr>
</thead>
<tbody>
<tr>
<td
style="vertical-align: top;">
id
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
<td
style="vertical-align: top;">
*</td>
<td
style="vertical-align: top;">
<table border="1">
<thead>
<tr>
<th colspan="1">
F</th>
</tr>
</thead>
<tbody>
<tr>
<td
style="vertical-align: top;">
id</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr>
<td>2</td>
<td><span style="color: blue;">0</span> id <span
style="color: blue;">5</span></td>
<td>+ id * id $</td>
<td>r<sub style="color: green;">6</sub></td>
</tr>
<tr>
<td>3</td>
<td><span style="color: blue;">0</span> F</td>
<td>+ id * id $</td>
<td><span style="color: blue;">3</span></td>
</tr>
<tr>
<td>4</td>
<td><span style="color: blue;">0</span> F <span
style="color: blue;">3</span></td>
<td>+ id * id $</td>
<td>r<sub style="color: green;">4</sub></td>
</tr>
<tr>
<td>5</td>
<td><span style="color: blue;">0</span> T</td>
<td>+ id * id $</td>
<td><span style="color: blue;">2</span></td>
</tr>
<tr>
<td>6</td>
<td><span style="color: blue;">0</span> T <span
style="color: blue;">2</span></td>
<td>+ id * id $</td>
<td>r<sub style="color: green;">2</sub></td>
</tr>
<tr>
<td>7</td>
<td><span style="color: blue;">0</span> E</td>
<td>+ id * id $</td>
<td><span style="color: blue;">1</span></td>
</tr>
<tr>
<td>8</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span></td>
<td>+ id * id $</td>
<td>s<span style="color: blue;">6</span></td>
</tr>
<tr>
<td>9</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span></td>
<td>id * id $</td>
<td>s<span style="color: blue;">5</span></td>
</tr>
<tr>
<td>10</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> id <span
style="color: blue;">5</span></td>
<td>* id $</td>
<td>r<sub style="color: green;">6</sub></td>
</tr>
<tr>
<td>11</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> F</td>
<td>* id $</td>
<td><span style="color: blue;">3</span></td>
</tr>
<tr>
<td>12</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> F <span
style="color: blue;">3</span></td>
<td>* id $</td>
<td>r<sub style="color: green;">4</sub></td>
</tr>
<tr>
<td>13</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T</td>
<td>* id $</td>
<td><span style="color: blue;">9</span></td>
</tr>
<tr>
<td>14</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T <span
style="color: blue;">9</span></td>
<td>* id $</td>
<td>s<span style="color: blue;">7</span></td>
</tr>
<tr>
<td>15</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T <span
style="color: blue;">9</span> * <span
style="color: blue;">7</span></td>
<td>id $</td>
<td>s<span style="color: blue;">5</span></td>
</tr>
<tr>
<td>16</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T <span
style="color: blue;">9</span> * <span
style="color: blue;">7</span> id <span
style="color: blue;">5</span></td>
<td>$</td>
<td>r<sub style="color: green;">6</sub></td>
</tr>
<tr>
<td>17</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T <span
style="color: blue;">9</span> * <span
style="color: blue;">7</span> F</td>
<td>$</td>
<td><span style="color: blue;">10</span></td>
</tr>
<tr>
<td>18</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T <span
style="color: blue;">9</span> * <span
style="color: blue;">7</span> F <span
style="color: blue;">10</span></td>
<td>$</td>
<td>r<sub style="color: green;">3</sub></td>
</tr>
<tr>
<td>19</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T</td>
<td>$</td>
<td><span style="color: blue;">9</span></td>
</tr>
<tr>
<td>20</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span> + <span
style="color: blue;">6</span> T <span
style="color: blue;">9</span></td>
<td>$</td>
<td>r<sub style="color: green;">1</sub></td>
</tr>
<tr>
<td>21</td>
<td><span style="color: blue;">0</span> E</td>
<td>$</td>
<td><span style="color: blue;">1</span></td>
</tr>
<tr>
<td>22</td>
<td><span style="color: blue;">0</span> E <span
style="color: blue;">1</span></td>
<td>$</td>
<td><span style="color: green;">acc</span></td>
</tr>
</tbody>
</table>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</td>
</tr>
</tbody>
</table>
<script language="javascript">
< !--
// <TEST>
{
/*
* (0) A' -> A
* (1) A -> a A
* (2) A -> a
*
* FIRST(A') = { a }
* FIRST(A) = { a }
*
* FOLLOW(A') = { $ }
* FOLLOW(A) = { $ }
*/
var grammar = new Grammar('A\' -> A\nA -> a A\nA -> a');
assertEquality('A\'', grammar.axiom);
assertEquality(3, grammar.rules.length);
assertEquality(['a'].toString(), grammar.firsts['A'].toString());
assertEquality(['$'].toString(), grammar.follows['A'].toString());
assertEquals(new Item(new Rule(grammar, 'A -> a A'), 1), new Item(new Rule(grammar, 'A -> a A'), 1));
assertEquality(0, indexOfUsingEquals(new Item(new Rule(grammar, 'A -> a A'), 1), [new Item(new Rule(grammar, 'A -> a A'), 1)]));
/*
* closure { A' -> .A } = 0 = { A' -> .A; A -> .a A; A -> .a }
* goto(0, A) = closure { A' -> A. } = 1 = { A' -> A. }
* goto(0, a) = closure { A -> a.A; A -> a. } = 2 = { A -> a.A; A -> a.; A -> .a A; A -> .a }
* goto(2, A) = closure { A -> a A. } = 3 = { A -> a A. }
* goto(2, a) = closure { A -> a.A; A -> a. } = 2
*/
var lrClosureTable = new LRClosureTable(grammar);
assertEquality(3, lrClosureTable.kernels[0].closure.length);
assertEquality(4, lrClosureTable.kernels.length);
/*
* a $ A' A
* 0 s2 1
* 1 r0
* 2 s2 r2 3
* 3 r1
*/
var lrTable = new LRTable(lrClosureTable);
assertEquality(4, lrTable.states.length);
assertEquality('s2', lrTable.states[0]['a']);
assertEquality('r0', lrTable.states[1]['$']);
assertEquality('s2', lrTable.states[2]['a']);
assertEquality('r2', lrTable.states[2]['$']);
assertEquality('3', lrTable.states[2]['A']);
assertEquality('r1', lrTable.states[3]['$']);
}
{
/*
* (0) A' -> A
* (1) A -> B
* (2) A -> ''
* (3) B -> ( A )
*
* FIRST(A') = { '', ( }
* FIRST(A) = { '', ( }
* FIRST(B) = { ( }
*
* FOLLOW(A') = { $ }
* FOLLOW(A) = { $, ) }
* FOLLOW(B) = { $, ) }
*/
var grammar = new Grammar('A\' -> A\nA -> B\nA -> \'\'\nB -> ( A )');
assertEquality('A\'', grammar.axiom);
assertEquality(4, grammar.rules.length);
assertEquality([EPSILON, '('].toString(), grammar.firsts['A'].toString());
assertEquality(['$', ')'].toString(), grammar.follows['A'].toString());
assertEquality('A -> .b', new Item(new Rule(grammar, 'A -> b'), 0).toString());
/*
* closure { A' -> .A } = 0 = { A' -> .A; A -> .B; A -> .; B -> .( A ) }
* goto(0, A) = closure { A' -> A. } = 1 = { A' -> A. }
* goto(0, B) = closure { A -> B. } = 2 = { A -> B. }
* goto(0, () = closure { B -> (.A ) } = 3 = { B -> (.A ); A -> .B; A -> .; B -> .( A ) }
* goto(3, A) = closure { B -> ( A.) } = 4 = { B -> ( A.) }
* goto(3, B) = closure { A -> B. } = 2
* goto(3, () = closure { B -> (.A ) } = 3
* goto(4, )) = closure { B -> ( A ). } = 5 = { B -> ( A ). }
*/
var lrClosureTable = new LRClosureTable(grammar);
assertEquality(4, lrClosureTable.kernels[0].closure.length);
assertEquality(6, lrClosureTable.kernels.length);
/*
* ( ) $ A' A B
* 0 s3 r2 r2 1 2
* 1 r0
* 2 r1 r1
* 3 s3 r2 r2 4 2
* 4 s5
* 5 r3 r3
*/
var lrTable = new LRTable(lrClosureTable);
assertEquality(6, lrTable.states.length);
assertEquality('s3', lrTable.states[0]['(']);
assertEquality('r0', lrTable.states[1]['$']);
assertEquality('4', lrTable.states[3]['A']);
}
// </TEST>
// <INITIALIZATION>
{
var grammar = new Grammar('E\' -> E\n\
E -> E + T\n\
E -> T\n\
T -> T * F\n\
T -> F\n\
F -> ( E )\n\
F -> id');
$element('grammarView').innerHTML = formatGrammar(grammar);
}
$element('lrParseView').innerHTML = formatInitialParseView('id + id * id', 100);
grammarChanged();
// </INITIALIZATION>
// -->
</script>
</body>
</html>