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index.html
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<!--
* @Author: LetMeFly
* @Date: 2022-06-20 22:21:32
* @LastEditors: LetMeFly
* @LastEditTime: 2022-06-22 22:45:26
-->
<!DOCTYPE html>
<html>
<head>
<title>语法分析</title>
<meta charset="utf-8">
<script src="https://letmefly.xyz/Links/Common.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/static/css/bootstrap.min.css">
<script src="/static/js/jquery.min.js"></script>
<script src="/static/js/bootstrap.min.js"></script>
<script src="/LSA.js"></script>
</head>
<body>
<div class="container">
<div class="jumbotron">
<h1>语法分析</h1>
<div class="row">
<div class="col-sm-2"><h3>LL(1)</h3></div>
<div class="col-sm-2"><h3>LR(0)</h3></div>
<div class="col-sm-2"><h3>SLR(1)</h3></div>
<div class="col-sm-2"><h3>LR(1)</h3></div>
<div class="col-sm-2"><h3>SALR(1)</h3></div>
</div>
</div>
<div class="row">
<div class="col-sm-4">
<h3>请选择要分析的文法</h3>
<form id="GrammarChoiceForm">
<label><input name="GrammarChoice" type="radio" value="LL1"> LL(1)</label> <br>
<label><input name="GrammarChoice" type="radio" value="LR0"> LR(0)</label> <br>
<label><input name="GrammarChoice" type="radio" value="SLR1"> SLR(1)</label> <br>
<label><input name="GrammarChoice" type="radio" value="LR1"> LR(1)</label> <br>
<label><input name="GrammarChoice" type="radio" value="SALR1"> SALR(1)</label> <br>
</form>
</div>
<div class="col-sm-4">
<h3>请输入文法规则</h3>
<textarea name="GrammarInput" id="GrammarInput" cols="30" rows="10"></textarea>
</div>
<div class="col-sm-4">
<h3>请输入要匹配的字符串</h3>
<input type="text" id="stringInput">
</div>
</div>
<div class="row" style="margin-top: 50px;">
<div class="col-sm-3"></div>
<div class="col-sm-6">
<button class="btn btn-primary" style="width: 100%;" onclick="analysis()"><h4>开始分析</h4></button>
</div>
<div class="col-sm-3"></div>
</div>
<div id="processDiv" style="margin-top: 20px;"></div>
</div>
<div class="beforeFooter" id="beforeFooter"></div>
<footer class="navbar-fixed-bottom" id="footer">
<div class="container" style="background-color: #eeeeee">
<div class="row">
<div class="col-sm-6">项目地址: <a href="https://github.com/LetMeFly666/SyntaxAnalysis" target="blank">https://github.com/LetMeFly666/SyntaxAnalysis</a></div>
<div class="col-sm-6">在线地址：<a href="https://yffx.letmefly.xyz" target="blank">https://yffx.letmefly.xyz (语法分析.letmefly.xyz)</a></div>
</div>
<div class="row" style="text-align: center;">
<span>DFA可视化：<a href="https://github.com/mermaid-js/mermaid" target="blank">mermiad</a> </span>
<span>使用 <a href="https://www.bootcss.com" target="blank">BootStrap</a>、<a href="https://jquery.com" target="blank">jQuery</a></span>
<span>By <a href="https://letmefly.xyz" target="blank">LetMeFly</a></span>
</div>
<!-- <div class="row" style="text-align: center;">
Copyright 2022 ©<a href="https://letmefly.xyz">LetMeFly</a> all rights reserved.
</div> -->
</div>
</footer>
<script>
const grammarChoiceForm = $("#GrammarChoiceForm");
const grammars = grammarChoiceForm.find("input");
const grammarInput = $("#GrammarInput");
const stringInput = $("#stringInput");
const processDiv = $("#processDiv");
function getChoosedGrammar() { // 获取选择的语法
for (var i = 0; i < grammars.length; i++) {
if (grammars[i].checked) {
return grammars[i].value;
}
}
}
function choose1grammar() { // 选择一个文法
grammarInput[0].placeholder = grammarSamples[this.value].grammar + "\n----------------------------------------\n空格可作为分隔符，不可作为终结符\n“|”代表“或”\n“ε”代表“空”\n“->”作为推导符号\n“->”左边出现过的为非终结符，其余未提到的为终结符";
stringInput[0].placeholder = grammarSamples[this.value].string;
};
function adjustFooter() { // 调整底部距离
const height = $("#footer").height();
$("#beforeFooter").height(height);
}
function analysis() { // 分析
processDiv.empty();
if (getChoosedGrammar() != "LL1") {
alert("待开发！当前仅支持LL(1)，当前" + getChoosedGrammar() + "也会按LL(1)的方法进行分析");
}
if (!grammarInput.val()) {
grammarInput.val(grammarSamples[getChoosedGrammar()].grammar);
}
const NT = getNTG(grammarInput.val());
// console.log(NT);
if (NT.error.length) {
const errorDiv = document.createElement("div");
errorDiv.setAttribute("id", "errorDiv");
processDiv.append(errorDiv);
const h3 = document.createElement("h3");
h3.innerText = "错误列表：";
errorDiv.append(h3);
const ul = document.createElement("ul");
ul.setAttribute("id", "errorUl");
ul.setAttribute("class", "list-group");
errorDiv.append(ul);
NT.error.forEach(e => {
const li = document.createElement("li");
li.setAttribute("class", "list-group-item");
li.innerText = e;
ul.append(li);
});
return;
}
function showNT(NT) {
const rowDiv = document.createElement("div");
rowDiv.setAttribute("class", "row");
processDiv.append(rowDiv);
// const formattedGrammarsDiv = document.createElement("div");
// formattedGrammarsDiv.setAttribute("id", "formattedGrammarsDiv");
// rowDiv.append(formattedGrammarsDiv);
const divLeft = document.createElement("div");
divLeft.setAttribute("class", "col-sm-6");
rowDiv.append(divLeft);
const h3 = document.createElement("h3");
h3.innerText = "格式化文法规则：";
divLeft.append(h3);
const ul = document.createElement("ul");
ul.setAttribute("id", "formattedGrammarsUl");
ul.setAttribute("class", "list-group");
divLeft.append(ul);
NT.formattedGrammars.forEach(e => {
const li = document.createElement("li");
li.setAttribute("class", "list-group-item");
li.innerText = e.N + " ->";
e.T.forEach(thisT => {
li.innerText += " " + thisT;
});
ul.append(li);
});
const divMiddle = document.createElement("div");
divMiddle.setAttribute("class", "col-sm-3");
rowDiv.append(divMiddle);
const TDiv = document.createElement("div");
divMiddle.append(TDiv);
const h3_2 = document.createElement("h3");
h3_2.innerText = "非终结符";
TDiv.append(h3_2);
const ul_2 = document.createElement("ul");
ul_2.setAttribute("id", "formattedGrammarsUl");
ul_2.setAttribute("class", "list-group");
TDiv.append(ul_2);
NT.N.forEach(e => {
const li = document.createElement("li");
li.setAttribute("class", "list-group-item");
li.innerText = e;
ul_2.append(li);
});
const divRight = document.createElement("div");
divRight.setAttribute("class", "col-sm-3");
rowDiv.append(divRight);
const NDiv = document.createElement("div");
// divRight.setAttribute("id", "formattedGrammarsDiv");
processDiv.append(NDiv);
const h3_3 = document.createElement("h3");
h3_3.innerText = "终结符";
divRight.append(h3_3);
const ul_3 = document.createElement("ul");
ul_3.setAttribute("id", "formattedGrammarsUl");
ul_3.setAttribute("class", "list-group");
divRight.append(ul_3);
NT.T.forEach(e => {
const li = document.createElement("li");
li.setAttribute("class", "list-group-item");
li.innerText = e;
ul_3.append(li);
});
}
showNT(NT);
// 消除左递归
const NTLRed = leftRecursion(NT);
const LeftedRecTitleDiv = document.createElement("div");
LeftedRecTitleDiv.setAttribute("class", "text-align: center");
processDiv.append(LeftedRecTitleDiv);
const LeftedRecTitleCenter = document.createElement("center");
LeftedRecTitleDiv.append(LeftedRecTitleCenter);
const LeftedRecTitleh3 = document.createElement("h3");
LeftedRecTitleh3.innerText = "消除左递归";
LeftedRecTitleCenter.append(LeftedRecTitleh3);
showNT(NTLRed);
// 提取左因子
const NTLefted = leftFactoring(NT);
const LeftedTitleDiv = document.createElement("div");
LeftedTitleDiv.setAttribute("class", "text-align: center");
processDiv.append(LeftedTitleDiv);
const LeftedTitleCenter = document.createElement("center");
LeftedTitleDiv.append(LeftedTitleCenter);
const LeftedTitleh3 = document.createElement("h3");
LeftedTitleh3.innerText = "提取左因子";
LeftedTitleCenter.append(LeftedTitleh3);
showNT(NTLefted);
// First Follow集合
const First = getFirst(NT);
const FirstFollowRowDiv = document.createElement("div");
FirstFollowRowDiv.setAttribute("class", "row");
processDiv.append(FirstFollowRowDiv);
const FirstDiv = document.createElement("div");
FirstDiv.setAttribute("class", "col-sm-6");
FirstFollowRowDiv.append(FirstDiv);
const FirstTitle = document.createElement("h3");
FirstTitle.innerText = "First集合";
FirstDiv.append(FirstTitle);
const FirstUl = document.createElement("ul");
FirstUl.setAttribute("class", "list-group");
FirstDiv.append(FirstUl);
for (key in First) {
const li = document.createElement("li");
li.setAttribute("class", "list-group-item");
FirstUl.append(li);
li.innerText = "First(" + key + ") = {";
firstElement = true;
First[key].forEach(thisElement => {
if (firstElement)
firstElement = false;
else
li.innerText += ", "; // BootStrap把空格吞了
li.innerText += thisElement;
});
li.innerText += "}";
}
// Follow集合
const Follow = getFollow(NT, First);
const FollowDiv = document.createElement("div");
FollowDiv.setAttribute("class", "col-sm-6");
FirstFollowRowDiv.append(FollowDiv);
const FollowTitle = document.createElement("h3");
FollowTitle.innerText = "Follow集合";
FollowDiv.append(FollowTitle);
const FollowUl = document.createElement("ul");
FollowUl.setAttribute("class", "list-group");
FollowDiv.append(FollowUl);
for (key in Follow) {
const li = document.createElement("li");
li.setAttribute("class", "list-group-item");
FollowUl.append(li);
li.innerText = "Follow(" + key + ") = {";
firstElement = true;
Follow[key].forEach(thisElement => {
if (firstElement)
firstElement = false;
else
li.innerText += ", "; // BootStrap把空格吞了
li.innerText += thisElement;
});
li.innerText += "}";
}
// LL(1)分析表
const LL1Table = getLL1Table(NT, First, Follow);
// console.log(LL1Table);
if (Array.isArray(LL1Table)) { // 冲突！！error
console.log(LL1Table);
alert("冲突!，详情请见控制台，格式[[N, T, LL1Table[N][T], thisGrammar], ..]");
return;
}
const TableTitleCenterDiv = document.createElement("div");
TableTitleCenterDiv.setAttribute("class", "text-align: center");
processDiv.append(TableTitleCenterDiv);
const TableTitle = document.createElement("h3");
TableTitle.innerText = "LL1分析表";
TableTitleCenterDiv.append(TableTitle);
const table = document.createElement("table");
table.setAttribute("class", "table");
processDiv.append(table);
// const caption = document.createElement("caption");
// caption.innerText = "LL1分析表";
// table.append(caption);
const thead = document.createElement("thead");
table.append(thead);
const tr = document.createElement("tr");
thead.append(tr);
const firstLeft = document.createElement("th");
firstLeft.innerText = "M[N, T]";
tr.append(firstLeft);
NT.T.forEach(thisT => {
const thisTr = document.createElement("th");
thisTr.innerText = thisT;
tr.append(thisTr);
});
const Dollar = document.createElement("th");
Dollar.innerText = "$";
tr.append(Dollar);
const tbody = document.createElement("tbody");
table.append(tbody);
NT.N.forEach(thisN => {
const tr = document.createElement("tr");
tbody.append(tr);
const thisNT = document.createElement("td");
thisNT.innerText = thisN;
tr.append(thisNT);
NT.T.forEach(thisT => {
const thisTr = document.createElement("td");
if (LL1Table[thisN][thisT]) {
thisTr.innerText = LL1Table[thisN][thisT].N + " -> ";
LL1Table[thisN][thisT].T.forEach(e => {
thisTr.innerText += e + " ";
});
}
tr.append(thisTr);
});
const Dollar = document.createElement("th");
if (LL1Table[thisN]["$"]) {
thisTr.innerText = LL1Table[thisN]["$"];
}
tr.append(Dollar);
});
// LL1分析栈
if (!$("#stringInput").val()) {
$("#stringInput").val($("#stringInput")[0].getAttribute("placeholder"));
}
// LL1stack(table, $("#stringInput").val());
const StackDivCenter = document.createElement("div");
StackDivCenter.setAttribute("class", "text-align: center");
processDiv.append(StackDivCenter);
const StackTableTitle = document.createElement("h3");
StackTableTitle.innerText = "LL1分析栈";
StackDivCenter.append(StackTableTitle);
const StackTable = document.createElement("table");
StackTable.setAttribute("class", "table");
processDiv.append(StackTable);
const StackHead = document.createElement("thead");
StackTable.append(StackHead);
StackHead.innerHTML = "<tr><th>分析栈</th><th>输入</th><th>动作</th></tr>";
const tbodyStack = document.createElement("tbody");
StackTable.append(tbodyStack);
function getFirstN() { // 获取最初的非终结符 // TODO: 和LSA重复
let isFirst = true;
let result;
NT.N.forEach(e => {
if (isFirst) {
result = e;
isFirst = false;
}
});
return result;
}
function insert1Line(stack1, stack2, action) {
const tr = document.createElement("tr");
tbodyStack.append(tr);
const td1 = document.createElement("td");
tr.append(td1)
for (var i = stack1.length - 1; i >= 0; i--) {
td1.innerText += stack1[i];
}
td1.innerText += "$";
const td2 = document.createElement("td");
for (var i = stack2.length - 1; i >= 0; i--) {
td2.innerText += stack2[i];
}
td2.innerText += "$";
tr.append(td2)
const td3 = document.createElement("td");
tr.append(td3)
td3.innerText = action;
}
const stackAna = [];
stackAna.push(getFirstN());
const stackInput = [];
const stringInputVal = $("#stringInput").val();
const stringInputList = [];
const stringInputValSplited = stringInputVal.split(" ");
stringInputValSplited.forEach(e => {
if (e)
stringInputList.push(e);
});
for (var i = stringInputList.length - 1; i >= 0; i--) {
stackInput.push(stringInputList[i]);
}
function accepted(stack1, stack2) {
if (stack1.length != 1 || stack2.length != 1)
return false;
return stack1[0] == "$" && stack1[1] == "$";
}
var times = 0;
while (!accepted(stackAna, stackInput)) {
const S1Copy = JSON.parse(JSON.stringify(stackAna));
const S2Copy = JSON.parse(JSON.stringify(stackInput));
times++;
if (times > 100)
break;
var action = "22";
var exit = false;
if (stackAna.length < 1 || stackInput.length < 1) {
if (stackAna.length == 0 && stackInput.length == 0) {
action = "接受！！";
exit = true;
}
else {
action = "错误！有栈为空";
exit = true;
}
}
else {
const FT = stackAna.pop();
const IT = stackInput.pop();
try {
if (FT == IT) {
action = "匹配";
}
else {
const grammar = LL1Table[FT][IT];
if (!grammar) {
action = "LL1表[" + FT + "][" + IT + "]为空！";
exit = true;
}
else {
action = grammar.N + " -> ";
grammar.T.forEach(e => {
action += e + " ";
});
if (grammar.T.length == 1 && grammar.T[0] == KONG) {
}
else {
for (var i = grammar.T.length - 1; i >= 0; i--) {
stackAna.push(grammar.T[i]);
}
}
stackInput.push(IT);
}
}
}
catch {
action = "错误！";
exit = true;
}
}
insert1Line(S1Copy, S2Copy, action);
if (exit)
break;
}
}
$(() => { // Onload
grammars.click(choose1grammar);
grammars[0].click();
adjustFooter();
});
$(window).resize(() => adjustFooter());
</script>
</body>
</html>