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1x.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
</body>
<script>
const regexp = /([0-9\.]+)|([ ]+)|([\r\n]+)|(\+)|(\-)|(\*)|(\/)/g
const dictionary = ["Number", "Whitespace", "LineTerminator", "+", "-", "*", "/"]
function* tokenize(source) {
let result = null
let lastIndex = 0
do {
// εΉι
lastIndex = regexp.lastIndex
result = regexp.exec(source)
// ε€ζ
if (!result)
break
if (regexp.lastIndex - lastIndex > result[0].length) {
throw new Error("Unexpected token \"" +
source.slice(lastIndex, regexp.lastIndex - result[0].length) + "\"!")
}
// ηζ token
let token = {
type: null,
value: null
}
for (let i = 0; i < dictionary.length; i++) {
if (result[i + 1])
token.type = (dictionary[i])
}
token.value = (result[0])
yield token
} while (result)
yield ({ type: 'EOF' })
}
function Expression(source) {
if (source[0].type === 'AdditiveExpression' && source[1].type === 'EOF') {
let node = {
type: 'Expression',
children: [source.shift(), source.shift()]
}
source.unshift(node)
return node;
}
AdditiveExpression(source)
return Expression(source)
}
function AdditiveExpression(source) {
if (source[0].type === 'Number') {
MultiplicationExpression(source)
return AdditiveExpression(source)
}
if (source[0].type === 'MultiplicationExpression') {
let node = {
type: 'AdditiveExpression',
children: [source.shift()],
}
source.unshift(node)
return AdditiveExpression(source)
}
if (source[0].type === 'AdditiveExpression'
&& source.length > 1 && source[1].type === '+') {
let node = {
type: 'AdditiveExpression',
children: [source.shift(), source.shift()],
}
MultiplicationExpression(source);
node.children.push(source.shift())
source.unshift(node)
return AdditiveExpression(source)
}
if (source[0].type === 'AdditiveExpression'
&& source.length > 1 && source[1].type === '-') {
let node = {
type: 'AdditiveExpression',
children: [source.shift(), source.shift()],
}
MultiplicationExpression(source);
node.children.push(source.shift())
source.unshift(node)
return AdditiveExpression(source)
return AdditiveExpression(source)
}
if (source[0].type === 'MultiplicationExpression') {
return source[0];
}
}
function MultiplicativeExpression(source) {
// console.log(source)
if (source[0].type === 'Number') {
let node = {
type: "MultiplicativeExpression",
children: [source.shift()]
}
source.unshift(node)
return MultiplicativeExpression(source)
}
if (source[0].type === "MultiplicativeExpression" &&
source.length > 1 && source[1].type === "*") {
let node = {
type: "MultiplicativeExpression",
children: [source.shift(), source.shift().source.shift()]
}
source.unshift(node)
return MultiplicativeExpression(source)
}
if (source[0].type === "MultiplicativeExpression" &&
source.length > 1 && source[1].type === "/") {
let node = {
type: "MultiplicativeExpression",
children: [source.shift(), source.shift().source.shift()]
}
source.unshift(node)
return MultiplicativeExpression(source)
}
if (source[0].type === "AdditiveExpression")
return source[0]
}
let source = []
for (let token of tokenize("10 * 25")) {
if (token.type !== 'Whitespace' && token.type !== "LineTerminator")
source.push(token)
}
console.log(MultiplicativeExpression(source))
</script>
</html>