├── .coveralls.yml ├── .gitignore ├── README.md ├── bin └── start ├── coverage ├── coverage.json └── lcov.info ├── index.js ├── package.json ├── src ├── compiler │ ├── generator.js │ ├── parser.js │ ├── tokenizer.js │ ├── transformer.js │ └── type │ │ ├── syntax.js │ │ └── token.js └── index.js └── test ├── parser.test.js └── tokenizer.test.js /.coveralls.yml: -------------------------------------------------------------------------------- 1 | # travis-pro 2 | service_name: continue-assign-parser 3 | repo_token: 7a4ADpF7hOTaF7HZdtMz22uTmGU6mOuLS 4 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | npm-debug* 3 | ceshi* 4 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # js连等语法编译器 2 | 背景： 3 | 在javascript语法中，假如我想为三个变量赋值，我通常需要这样写 4 | ``` 5 | var a, b, c = 1000 6 | a = b = c 7 | ``` 8 | 或者这样写 9 | ``` 10 | var a = 1000, b = 1000, c = 1000 11 | ``` 12 | 可以看出来，不管我们采用哪种方式赋值，都会重复敲入一些代码 13 | * 第一种方式，我们多敲入了三个变量a、b、c。 14 | * 第二种方式，我们多敲入了两次变量值 1000。 15 | 上面我们命名的变量不是很复杂，仅仅作为演示用的单字符变量名。但是实际开发环境中，我们往往要为变量定义语义化的名字。 16 | ``` 17 | var baseSalary, middleSalary, highSalary = 1000 18 | baseSalary = middleSalary = highSalary 19 | ``` 20 | 这次我们要多敲入很多字符了，虽然可以用拷贝粘贴的方式，但是仍然是有一定的工作量。 21 | 也许你觉得没有什么，不就是多敲一些字符吗？这么懒吗！ 22 | 懒到是其次，我觉得这可以作为一个问题进行思考，能不能创造一种新的语法，能让我们更简单地为多个变量赋值呢？ 23 | 经过一番思考，我想出了下面这种方式，上面两种情况我用下面的代码来表示 24 | ``` 25 | var a b c = 1000 26 | 27 | var baseSalary middleSalary HighSalary = 1000 28 | ``` 29 | 是不是简洁了很多？这就是我想要的语法，在此命名为**连等语法**。 30 | 31 | 但javascript语法不支持这种方式，所以我必须要实现一个编译器，来转译这种语法。 32 | 33 | >注意：为了简便起见，我为该语法做了一些限制，如下： 34 | * 只允许用var、let 关键字赋值。 35 | * 只允许为变量赋予以下几种类型的值 36 | * 字符串字面量 37 | * 数字字面量 38 | * null字面量 39 | * bool字面量 40 | * 如果超出了以上规则，则不认为是有效的连等语法，编译器不会对它进行编译。 41 | 42 | ## 使用方式 43 | 这个库有两种使用方式，一种是命令行方式，一种是webpack-loader的方式。 44 | #### 命令行方式 45 | 首先，我们先全局安装continue-assign-parser，安装完暴露编译命令**aparse** 46 | ``` 47 | npm install -g continue-assign-parser 48 | 49 | ``` 50 | 其次，我们用如下两种命令进行编译 51 | 1. 编译文件 52 | ``` 53 | aparse -f 'index.js' 54 | ``` 55 | 编译目录下名为index.js的文件，返回编译好的代码 56 | 57 | 2. 编译字符串 58 | ``` 59 | aparse -s 'let a b c = 1000' 60 | ``` 61 | 62 | 大家也许很好奇编译后的代码是什么形式，拿上面这段代码来说，编译后的代码如下： 63 | ``` 64 | let a, b, c 65 | a = b = c = 1000 66 | ``` 67 | #### webpack-loader的方式 68 | 为了方便大家使用，我专门写了一个webpack-loader，传送门[assign-loader](https://github.com) 69 | 使用方式如下 70 | ``` 71 | npm install -D assign-loader 72 | ``` 73 | 在webpack的配置文件中关于模块加载器这一项，assign-loader一定要配置在js文件编译的第一个阶段。因为大部分js加载器都不支持我们的连等语法，如果我们不在第一步进行转译的话，后续js加载器会报语法错误。配置示例如下 74 | ``` 75 | module:{ 76 | rules:[ 77 | { 78 | test: /\.js$/, 79 | use: ['babel-loader'], 80 | exclude: /(node_modules)/ 81 | }, 82 | { 83 | test: /\.(js|vue)$/, 84 | loader: 'eslint-loader', 85 | exclude: /node_modules/, 86 | enforce: 'pre', 87 | options: { 88 | eslint: { 89 | configFile: '.eslintrc' 90 | } 91 | } 92 | }, 93 | { 94 | test: /\.vue$/, 95 | use: [ 96 | { 97 | loader: 'vue-loader', 98 | options: { 99 | postcss: [require('postcss-bem')(),require('postcss-cssnext')()] 100 | } 101 | } 102 | ], 103 | }, 104 | { 105 | test: /\.(jsd|vue|js)$/, 106 | loader: 'assign-loader', 107 | exclude: /node_modules/ 108 | }, 109 | { 110 | //设置对应的资源后缀. 111 | test: /\.(css|scss)$/, 112 | //设置后缀对应的加载器. 113 | loader: ExtractTextPlugin.extract({ 114 | loader: 'css-loader?modules' 115 | }) 116 | } 117 | ] 118 | } 119 | ``` 120 | -------------------------------------------------------------------------------- /bin/start: -------------------------------------------------------------------------------- 1 | #! /usr/bin/env node 2 | "use strict"; 3 | const program = require('commander') 4 | const compile = require('../index') 5 | const fs = require('fs') 6 | const path = require('path') 7 | program 8 | .usage(' [project-name]') 9 | .option('-f, --file ', 'parse file') 10 | .option('-s, --string ', 'parse string') 11 | 12 | 13 | program.parse(process.argv) 14 | let result = '' 15 | if(program.string){ 16 | result = compile(program.string) 17 | } else if(program.file){ 18 | let source = fs.readFileSync(path.resolve(process.cwd(),program.file),"utf-8") 19 | result = compile(source) 20 | } 21 | console.log("------------------start") 22 | console.log(result) 23 | console.log("--------------------end") 24 | -------------------------------------------------------------------------------- /coverage/coverage.json: -------------------------------------------------------------------------------- 1 | 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BRDA:412,87,1,79 741 | BRDA:413,88,0,1 742 | BRDA:413,88,1,0 743 | BRDA:413,89,0,1 744 | BRDA:413,89,1,1 745 | BRDA:422,90,0,20 746 | BRDA:422,90,1,59 747 | BRF:224 748 | BRH:124 749 | end_of_record 750 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | const compile = require('./src/index') 2 | 3 | module.exports = compile 4 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "continue-assign-parser", 3 | "version": "1.0.0", 4 | "description": "a parser which can parse assign a value to some variables", 5 | "main": "index.js", 6 | "scripts": { 7 | "test": "mocha -u bdd ./test/*.js", 8 | "cov":"istanbul cover ./node_modules/mocha/bin/_mocha test/*.js --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage" 9 | }, 10 | "bin": { 11 | "aparse": "bin/start" 12 | }, 13 | "keywords": [ 14 | "parser", 15 | "js", 16 | "assign" 17 | ], 18 | "repository": { 19 | "type": "git", 20 | "url": "https://github.com/lucefer/continue-assign-parser.git" 21 | }, 22 | "author": "lucefer", 23 | "license": "MIT", 24 | "devDependencies": { 25 | "chai": "^4.0.2", 26 | "coveralls": "^2.13.1", 27 | "istanbul": "^0.4.5", 28 | "mocha": "^3.4.2" 29 | } 30 | } 31 | -------------------------------------------------------------------------------- /src/compiler/generator.js: -------------------------------------------------------------------------------- 1 | const Syntax=require('./type/syntax') 2 | 3 | function codeGenerator(node,parent_node){ 4 | let str='' 5 | switch(node.type){ 6 | case Syntax.Program: 7 | for(let i = 0;i < node.body.length;i++) { 8 | if(i == node.body.length - 1){ 9 | str += codeGenerator(node.body[i]) 10 | } else { 11 | str += codeGenerator(node.body[i]) + "\n" 12 | } 13 | } 14 | break 15 | case Syntax.VariableDeclaration: 16 | str += node.kind + " " 17 | for(let i = 0;i < node.body.length; i++) { 18 | str += codeGenerator(node.body[i]) + "," 19 | } 20 | str = str.substr(0, str.length-1) 21 | break 22 | case Syntax.AssignmentExpression: 23 | for(let i = 0; i < node.body.length; i++) { 24 | if(i === node.body.length - 1){ 25 | str += codeGenerator(node.body[i]) 26 | } else { 27 | str += codeGenerator(node.body[i]) + "\n" 28 | } 29 | } 30 | break 31 | case Syntax.AssignmentEqual: 32 | if(node.value !== undefined) { 33 | for(let i = 0; i < node.body.length; i++) { 34 | str += (codeGenerator(node.body[i], node) + "=") 35 | } 36 | str += node.value 37 | } 38 | break 39 | case Syntax.Identifier: 40 | if(parent_node && parent_node.type === Syntax.AssignmentEqual) { 41 | return node.value 42 | } else { 43 | if(node.init !== undefined) { 44 | return node.value + "=" + node.init 45 | } else { 46 | return node.value 47 | } 48 | } 49 | break 50 | } 51 | return str 52 | } 53 | 54 | module.exports = codeGenerator 55 | -------------------------------------------------------------------------------- /src/compiler/parser.js: -------------------------------------------------------------------------------- 1 | const Type = require('./type/token') 2 | const Syntax = require('./type/syntax') 3 | 4 | function Node(type, value) 5 | { 6 | 7 | } 8 | let token_list, len, pos, current_token 9 | 10 | function parse(tokens) { 11 | let ast = null 12 | token_list = tokens 13 | len = token_list.length 14 | pos = 0 15 | 16 | try { 17 | ast = parseProgram() 18 | } 19 | catch(ex) { 20 | //console.warn("parse-warn: ",ex) 21 | } 22 | return ast 23 | } 24 | 25 | function parseProgram() { 26 | let body, node 27 | node = new Node() 28 | body = parseScriptBody() 29 | let hasEqual = false 30 | for(let i = 0; i < body.length; i++) { 31 | if(body[i]) { 32 | let variableNode = body[i] 33 | for(let j=0; j < variableNode.body.length; j++){ 34 | if(variableNode.body[j].type === Syntax.EqualVariableDeclaration){ 35 | hasEqual = true 36 | break 37 | } 38 | } 39 | } 40 | if(hasEqual){ 41 | break 42 | } 43 | } 44 | if(!hasEqual){ 45 | return null 46 | } 47 | node.type = Syntax.Program 48 | node.body = body 49 | return node 50 | } 51 | 52 | function parseScriptBody() { 53 | let statement, body = [] 54 | current_token = token_list[pos] 55 | statement = parseStatementListItem() 56 | statement && (body.push(statement)) 57 | return body 58 | } 59 | 60 | function parseStatementListItem() { 61 | if (current_token.type === Type.KEYWORD) { 62 | switch (current_token.value) { 63 | case 'var': 64 | case 'let': 65 | let kind = current_token.value 66 | let node = parseVariableDeclarationList() 67 | node.kind = kind 68 | return node 69 | break 70 | } 71 | } 72 | return null 73 | } 74 | 75 | function parseVariableDeclarationList() { 76 | pos++ 77 | current_token = token_list[pos] 78 | return parseVariableDeclaration() 79 | } 80 | function parseVariableDeclaration() { 81 | let init = null, 82 | id, node = new Node(), 83 | id_list = [] 84 | if(isPunctuator("[") || isPunctuator("{")) { 85 | return null 86 | } 87 | parseEqualVariableDeclaration(id_list) 88 | node.type = Syntax.VariableDeclaration 89 | node.body = id_list 90 | return node 91 | } 92 | 93 | 94 | function parseEqualVariableDeclaration(re) { 95 | let node, equalNode, id_list 96 | current_token = token_list[pos++] 97 | while(current_token.type === Type.IDENTIFIER) { 98 | node = new Node() 99 | node.type = Syntax.Identifier 100 | node.value = current_token.value; 101 | !id_list && (id_list = []) 102 | id_list.push(node) 103 | current_token = token_list[pos++] 104 | } 105 | if(!id_list) { 106 | return 107 | } 108 | if(id_list.length > 1) { 109 | equalNode = new Node() 110 | equalNode.type = Syntax.EqualVariableDeclaration 111 | equalNode.body = id_list 112 | re.push(equalNode) 113 | } else if (id_list.length === 1) { 114 | re.push(node) 115 | } 116 | if(current_token && current_token.value === ',') { 117 | if(equalNode){ 118 | equalNode.init = undefined 119 | } else { 120 | id_list.forEach(function(n){ 121 | n.init = undefined 122 | }) 123 | } 124 | parseEqualVariableDeclaration(re) 125 | } 126 | let init = '' 127 | if(current_token && current_token.value === '=') { 128 | current_token = token_list[pos++] 129 | if (current_token.type === Type.STRING_LITERAL || current_token.type === Type.NUMBER_LITERAL || current_token.type == Type.BOOLEAN_LITERAL || current_token.type == Type.NULL_LITERAL) { 130 | if(current_token.type === Type.STRING_LITERAL) { 131 | init = '"' + current_token.value + '"' 132 | } else { 133 | init = current_token.value 134 | } 135 | current_token = token_list[pos++] 136 | } else if (current_token.type === Syntax.BR) { 137 | current_token = token_list[pos++] 138 | } else { 139 | throw new Error("语法分析错误") 140 | } 141 | if(equalNode) { 142 | equalNode.init = init 143 | } else { 144 | node.init = init 145 | } 146 | } 147 | if(current_token && current_token.value === ',') { 148 | parseEqualVariableDeclaration(re) 149 | } 150 | } 151 | 152 | function isPunctuator(type, value) { 153 | if(current_token.type === Type.PUNCTUATOR && current_token.value === value) { 154 | return true 155 | } 156 | return false 157 | } 158 | 159 | 160 | 161 | module.exports = parse 162 | -------------------------------------------------------------------------------- /src/compiler/tokenizer.js: -------------------------------------------------------------------------------- 1 | const Type = require('./type/token') 2 | 3 | const NumberReg = /[0-9]/ 4 | const LetterReg = /[a-z]/i 5 | const WhitespaceReg = /[\u0020\u00A0\u0009\u000B\u000C]/ 6 | 7 | let pos = 0 8 | let char 9 | let source 10 | let len 11 | 12 | //当前字符是否符合标识符的开始规则 13 | function isIdStart(ch) { 14 | return (ch === '$') || (ch === '_')|| 15 | (LetterReg.test(ch)) 16 | } 17 | //当前字符是否是标识符的一部分 18 | function isIdPart(ch) { 19 | return (ch === '$') || (ch === '_') || // $ and _ 20 | LetterReg.test(ch)|| // a..zA..Z 21 | NumberReg.test(ch) // 0..9 22 | } 23 | 24 | function isKeyword(id) { 25 | switch(id.length) { 26 | case 2: 27 | return (id === 'if') || (id === 'in') || (id === 'do') 28 | case 3: 29 | return (id === 'var') || (id === 'for') || (id === 'new') || 30 | (id === 'try') || (id === 'let') 31 | case 4: 32 | return (id === 'this') || (id === 'else') || (id === 'case') || 33 | (id === 'void') || (id === 'with') || (id === 'enum') 34 | case 5: 35 | return (id === 'while') || (id === 'break') || (id === 'catch') || 36 | (id === 'throw') || (id === 'const') || (id === 'yield') || 37 | (id === 'class') || (id === 'super') 38 | case 6: 39 | return (id === 'return') || (id === 'typeof') || (id === 'delete') || 40 | (id === 'switch') || (id === 'export') || (id === 'import') 41 | case 7: 42 | return (id === 'default') || (id === 'finally') || (id === 'extends') 43 | case 8: 44 | return (id === 'function') || (id === 'continue') || (id === 'debugger') 45 | case 10: 46 | return (id === 'instanceof') 47 | default: 48 | return false 49 | } 50 | } 51 | //获取标识符token 52 | function getId() { 53 | let start, ch 54 | start = pos++ 55 | ch = source[start] 56 | while(pos < len) { 57 | ch = source[pos] 58 | if(isIdPart(ch)) { 59 | ++ pos 60 | } else { 61 | break 62 | } 63 | } 64 | return source.slice(start, pos) 65 | } 66 | 67 | //扫描标识符，得出标识符类型 68 | function scanId(){ 69 | let start, id, type 70 | start = pos 71 | id = getId() 72 | if(id.length === 1){ 73 | type = Type.IDENTIFIER 74 | }else if(isKeyword(id)) { 75 | type = Type.KEYWORD 76 | } else if(id === 'null') { 77 | type = Type.NULL_LITERAL 78 | } else if(id === 'true' || id === 'false'){ 79 | type = Type.BOOLEAN_LITERAL 80 | } else { 81 | type = Type.IDENTIFIER 82 | } 83 | return { 84 | type: type, 85 | value: id 86 | } 87 | } 88 | 89 | function getNextToken(){ 90 | let cp, token 91 | if(pos > len){ 92 | return { 93 | type: Type.EOF 94 | } 95 | } 96 | cp = source[pos] 97 | if(isIdStart(cp)) { 98 | token = scanId() 99 | return token 100 | } 101 | 102 | if(cp === '(' || cp === ')' || cp === ';' || cp ===',') { 103 | token = scanPuntuator() 104 | return token 105 | } 106 | if(cp === '"'|| cp === '\'') { 107 | token = scanStringLiteral() 108 | return token 109 | } 110 | if(cp === ".") { 111 | if(isDecimalDigit(source[pos + 1])) { 112 | return scanNumberLiteral() 113 | } 114 | return scanPuntuator() 115 | } 116 | if(isDecimalDigit(cp)) { 117 | return scanNumberLiteral() 118 | } 119 | return scanPuntuator() 120 | } 121 | function scanHexLiteral() { 122 | let number = '' 123 | while(pos < len) { 124 | if(!isHexDigit(source[pos])) { 125 | break 126 | } 127 | number += source[pos++] 128 | } 129 | if(number.length === 0) { 130 | throwUnexpectedToken() 131 | } 132 | return { 133 | type: Type.NUMBER_LITERAL, 134 | value: parseInt('0x' + number, 16) 135 | } 136 | } 137 | function scanBinaryliteral() { 138 | let number = '', ch 139 | 140 | while(pos < len) { 141 | ch = source[pos] 142 | if(ch != '0' && ch != '1') { 143 | break 144 | } 145 | 146 | number += source[pos++] 147 | 148 | } 149 | 150 | if(number.length === 0) { 151 | throwUnexpectedToken() 152 | } 153 | if(pos < len) { 154 | if(isIdStart(ch) || isDecimalDigit(ch)) { 155 | throwUnexpectedToken() 156 | } 157 | } 158 | return { 159 | type: Type.NUMBER_LITERAL, 160 | value: parseInt(number, 2) 161 | } 162 | 163 | } 164 | function isOctalDigit(ch) { 165 | return "01234567".indexOf(ch) > -1 166 | } 167 | function scanOctalLiteral() { 168 | let number = '', ch, isOctal = false 169 | ch = source[pos] 170 | if(isOctalDigit(ch)) { 171 | isOctal = true 172 | number = "0" + ch 173 | } 174 | pos++ 175 | while(pos < len) { 176 | ch = source[pos] 177 | if(!isOctalDigit(ch)) { 178 | break 179 | }else{ 180 | number += source[pos++] 181 | } 182 | } 183 | if(!isOctal && number.length === 0){ 184 | throwUnexpectedToken() 185 | } 186 | if(isIdStart(ch) || isDecimalDigit(ch)) { 187 | throwUnexpectedToken() 188 | } 189 | return { 190 | type: Type.NUMBER_LITERAL, 191 | value: parseInt(number, 8) 192 | } 193 | } 194 | function isImplicitOctal(){ 195 | let i, ch 196 | for(i = (pos + 1); i 0x10FFFF || ch !== '}') { 314 | throwUnexpectedToken() 315 | } 316 | return String.fromCharCode(code) 317 | } 318 | /** 319 | * [扫描unicode字符串] 320 | * @method scanHexEscaped 321 | * @param {[type]} ch [description] 322 | * @return {[type]} [description] 323 | */ 324 | function scanHexEscaped(ch) { 325 | let length, code = 0 326 | length = ch === 'u'?4:2 327 | for(let i = 0; i < length; i++) { 328 | if(pos < len && isHexDigit(source[pos])) { 329 | ch = source[pos++] 330 | code = code * 16 + "0123456789abcdef".indexOf(ch.toLowerCase()) 331 | } else { 332 | return '' 333 | } 334 | } 335 | return String.fromCharCode(code) 336 | } 337 | /** 338 | * [扫描字符串字面量] 339 | * @method scanStringLiteral 340 | * @return {[type]} [description] 341 | */ 342 | function scanStringLiteral(){ 343 | let cp, start, str = '', ch, isValid = false, unescaped 344 | cp = source[pos] 345 | start = pos 346 | ++pos 347 | if(cp !== '"' && cp !== '\'') { 348 | throw new Error("string literal must starts with a quote") 349 | } 350 | while(pos < len) { 351 | let ch = source[pos++] 352 | if(ch === cp){ 353 | isValid = true 354 | break 355 | } 356 | if(ch === '\\') { 357 | ch = source[pos++] 358 | if(!ch || !isLineTerminal(ch)) { 359 | switch(ch) { 360 | case 'u': 361 | case 'x': 362 | if(source[pos] === '{') { 363 | ++pos 364 | str += scanUnicode() 365 | } else { 366 | unescaped = scanHexEscaped(ch) 367 | if(!unescaped) { 368 | throwUnexpectedToken() 369 | } 370 | str += unescaped 371 | } 372 | break; 373 | case 'r': 374 | case 'n': 375 | case 't': 376 | case 'b': 377 | case 'f': 378 | case 'v': 379 | str += "\\" + ch 380 | break; 381 | case '8': 382 | case '9': 383 | str += ch 384 | throwUnexpectedToken() 385 | break 386 | default: 387 | str += ch 388 | } 389 | } else { 390 | if(ch === "\r" && source[pos] === "\n") { 391 | pos++ 392 | } 393 | } 394 | } else if(isLineTerminal(ch)) { 395 | break 396 | } else { 397 | str += ch 398 | } 399 | } 400 | if(isValid) { 401 | return { 402 | type: Type.STRING_LITERAL, 403 | value: str 404 | } 405 | } 406 | else{ 407 | throwUnexpectedToken() 408 | } 409 | } 410 | /** 411 | * [扫描操作符] 412 | * @method scanPuntuator 413 | * @return {[type]} [description] 414 | */ 415 | function scanPuntuator() { 416 | let ch, token, start 417 | token = { 418 | type: Type.PUNCTUATOR, 419 | value: '' 420 | } 421 | start = pos 422 | ch = source[pos] 423 | switch(ch) { 424 | case ',': 425 | ++pos 426 | break 427 | case '=': 428 | ++pos 429 | break 430 | default: 431 | throwUnexpectedToken() 432 | } 433 | token.value = source.slice(start, pos) 434 | return token 435 | } 436 | function tokenizer(src) { 437 | pos = 0 438 | source = src 439 | let token_list = [] 440 | len = src.length 441 | try { 442 | while(pos < len) { 443 | var cp = src[pos] 444 | if(isLineTerminal(cp)) { 445 | if(!!token_list.length && token_list[token_list.length-1].type !== Type.BR) { 446 | token_list.push({ 447 | type: Type.BR, 448 | value: 'br' 449 | }) 450 | } 451 | pos++ 452 | continue 453 | } 454 | if(WhitespaceReg.test(cp)) { 455 | pos++ 456 | continue 457 | } 458 | token_list.push(getNextToken()) 459 | } 460 | } 461 | catch(ex){ 462 | } 463 | return token_list 464 | } 465 | 466 | module.exports = tokenizer 467 | -------------------------------------------------------------------------------- /src/compiler/transformer.js: -------------------------------------------------------------------------------- 1 | const Syntax=require('./type/syntax') 2 | function tranverser(old_ast, visitor) { 3 | function tranverseArray(array, parent_node) { 4 | array.forEach(function(node) { 5 | tranverseNode(node, parent_node) 6 | }) 7 | } 8 | function tranverseNode(node, parent_node) { 9 | let type = node.type 10 | let method = visitor[type] 11 | if(method && method.enter) { 12 | method.enter(node, parent_node) 13 | } 14 | switch(type) { 15 | case 'Program': 16 | tranverseArray(node.body, node) 17 | break 18 | case 'VariableDeclaration': 19 | tranverseArray(node.body, node) 20 | break 21 | case 'EqualVariableDeclaration': 22 | tranverseArray(node.body, node) 23 | break 24 | case 'Identifier': 25 | break 26 | default:throw new Error("未知的语法类型："+node.type) 27 | } 28 | if(method && method.exit) { 29 | method.exit(node, parent_node) 30 | } 31 | } 32 | tranverseNode(old_ast, null) 33 | } 34 | 35 | function transformer(old_ast) { 36 | let new_ast = { 37 | type: 'Program', 38 | body: [] 39 | } 40 | old_ast.context = new_ast.body 41 | let visitor = { 42 | 'VariableDeclaration': { 43 | enter(node, node_parent) { 44 | let assignNode = { 45 | type: Syntax.AssignmentExpression, 46 | body:[] 47 | } 48 | let variableNode={ 49 | type: Syntax.VariableDeclaration, 50 | body: [], 51 | kind: node.kind 52 | } 53 | node.assign_context = assignNode.body 54 | node.context = variableNode.body 55 | node_parent.context.push(variableNode) 56 | node_parent.context.push(assignNode) 57 | } 58 | }, 59 | 'EqualVariableDeclaration': { 60 | enter(node,node_parent) { 61 | let assignNode = { 62 | type: 'AssignmentEqual', 63 | body: [], 64 | value: node.init 65 | } 66 | node.other_context = assignNode.body 67 | node_parent.assign_context.push(assignNode) 68 | node.context = node_parent.context 69 | } 70 | }, 71 | 'Identifier': { 72 | enter(node, node_parent) { 73 | if(node_parent.other_context) { 74 | node_parent.other_context.push(node) 75 | } 76 | node_parent.context.push(node) 77 | } 78 | } 79 | } 80 | tranverser(old_ast, visitor) 81 | return new_ast 82 | } 83 | 84 | module.exports = transformer 85 | -------------------------------------------------------------------------------- /src/compiler/type/syntax.js: -------------------------------------------------------------------------------- 1 | const Syntax = { 2 | AssignmentExpression: 'AssignmentExpression', //赋值表达式 3 | AssignmentEqual:'AssignmentEqual',//连等赋值表达式 4 | ArrayExpression: 'ArrayExpression', //数组表达式 5 | ArrayPattern: 'ArrayPattern', //数组结构赋值 6 | Identifier: 'Identifier', //变量表达式 7 | Literal: 'Literal', //字面量 8 | ObjectExpression: 'ObjectExpression', //对象表达式 9 | ObjectPattern: 'ObjectPattern', //对象结构赋值 10 | Program: 'Program', //程序 11 | VariableDeclaration: 'VariableDeclaration', //变量定义 12 | EqualVariableDeclaration: 'EqualVariableDeclaration'//连等赋值变量表达式 13 | } 14 | 15 | module.exports = Syntax 16 | -------------------------------------------------------------------------------- /src/compiler/type/token.js: -------------------------------------------------------------------------------- 1 | const tokenType = { 2 | IDENTIFIER: 1, 3 | KEYWORD: 2, 4 | EOF: 3, 5 | NULL_LITERAL: 4, 6 | BOOLEAN_LITERAL: 5, 7 | PUNCTUATOR: 6, 8 | NUMBER_LITERAL: 7, 9 | BR: 8, 10 | STRING_LITERAL: 9 11 | } 12 | module.exports = tokenType 13 | -------------------------------------------------------------------------------- /src/index.js: -------------------------------------------------------------------------------- 1 | const tokenizer = require('./compiler/tokenizer') 2 | const parser = require('./compiler/parser') 3 | const transformer = require('./compiler/transformer') 4 | const generator = require('./compiler/generator') 5 | 6 | function compile(source) { 7 | let token_list, ast, new_ast, code = '' 8 | token_list = tokenizer(source) 9 | if(token_list.length === 0){ 10 | return source 11 | } 12 | ast = parser(token_list) 13 | if(!ast) { 14 | return source 15 | } 16 | new_ast = transformer(ast) 17 | if(new_ast.body.length === 1) { 18 | return source 19 | } 20 | code = generator(new_ast) 21 | return code 22 | } 23 | 24 | module.exports = compile 25 | -------------------------------------------------------------------------------- /test/parser.test.js: -------------------------------------------------------------------------------- 1 | const parser = require('../src/compiler/parser') 2 | const expect = require('chai').expect 3 | describe("【语法分析】测试用例", function() { 4 | it("用例一", function() { 5 | const input = [{ 6 | type: 2, 7 | value: 'let' 8 | }, { 9 | type: 1, 10 | value: 'n' 11 | }, { 12 | type: 6, 13 | value: ',' 14 | }, { 15 | type: 1, 16 | value: 'm' 17 | }, { 18 | type: 1, 19 | value: 'e' 20 | }, { 21 | type: 1, 22 | value: 'f' 23 | }, { 24 | type: 1, 25 | value: 'g' 26 | }, { 27 | type: 6, 28 | value: '=' 29 | }, { 30 | type: 7, 31 | value: 10 32 | }] 33 | const expected = { 34 | "type": "Program", 35 | "body": [{ 36 | "type": "VariableDeclaration", 37 | "body": [{ 38 | "type": "Identifier", 39 | "value": "n" 40 | }, { 41 | "type": "EqualVariableDeclarations", 42 | "body": [{ 43 | "type": "Identifier", 44 | "value": "m" 45 | }, { 46 | "type": "Identifier", 47 | "value": "e" 48 | }, { 49 | "type": "Identifier", 50 | "value": "f" 51 | }, { 52 | "type": "Identifier", 53 | "value": "g" 54 | }], 55 | "init": 10 56 | }], 57 | "kind": "let" 58 | }] 59 | } 60 | const output = parser(input) 61 | console.log(JSON.stringify(output)) 62 | expect(JSON.stringify(output) === JSON.stringify(expected)).to.be.true 63 | }) 64 | it("用例二", function() { 65 | const input = [{ 66 | type: 2, 67 | value: 'let' 68 | }, { 69 | type: 1, 70 | value: 'n' 71 | }, { 72 | type: 6, 73 | value: ',' 74 | }, { 75 | type: 1, 76 | value: 'm' 77 | }, { 78 | type: 2, 79 | value: 'var' 80 | }, { 81 | type: 1, 82 | value: 'f' 83 | }, { 84 | type: 6, 85 | value: '[' 86 | }, { 87 | type: 6, 88 | value: '=' 89 | }, { 90 | type: 7, 91 | value: 10 92 | }] 93 | const expected = { 94 | "type": "Program", 95 | "body": [{ 96 | "type": "VariableDeclaration", 97 | "body": [{ 98 | "type": "Identifier", 99 | "value": "n" 100 | }, { 101 | "type": "EqualVariableDeclarations", 102 | "body": [{ 103 | "type": "Identifier", 104 | "value": "m" 105 | }, { 106 | "type": "Identifier", 107 | "value": "e" 108 | }, { 109 | "type": "Identifier", 110 | "value": "f" 111 | }, { 112 | "type": "Identifier", 113 | "value": "g" 114 | }], 115 | "init": 10 116 | }], 117 | "kind": "let" 118 | }] 119 | } 120 | const output = parser(input) 121 | console.log(JSON.stringify(output)) 122 | expect(JSON.stringify(output) === JSON.stringify(expected)).to.be.true 123 | }) 124 | }) 125 | -------------------------------------------------------------------------------- /test/tokenizer.test.js: -------------------------------------------------------------------------------- 1 | const tokenizer = require('../src/compiler/tokenizer') 2 | const expect = require('chai').expect 3 | 4 | describe("【词法分析】测试用例", function(){ 5 | it("用例一",function(){ 6 | const input = 'let n,m e f g=10' 7 | const expected = [{ 8 | type: 2, 9 | value: 'let' 10 | }, { 11 | type: 1, 12 | value: 'n' 13 | }, { 14 | type: 6, 15 | value: ',' 16 | }, { 17 | type: 1, 18 | value: 'm' 19 | }, { 20 | type: 1, 21 | value: 'e' 22 | }, { 23 | type: 1, 24 | value: 'f' 25 | }, { 26 | type: 1, 27 | value: 'g' 28 | }, { 29 | type: 6, 30 | value: '=' 31 | }, { 32 | type: 7, 33 | value: 10 34 | }] 35 | const output = tokenizer(input) 36 | expect(JSON.stringify(output) === JSON.stringify(expected)).to.be.true 37 | }) 38 | it("用例一",function(){ 39 | const input = `let n,m=true, e f g='10', 40 | fn=null,cc=0x20,zz='\u0039',ff=077,ffg = 'tests测试'` 41 | const expected = [{ 42 | type: 2, 43 | value: 'let' 44 | }, { 45 | type: 1, 46 | value: 'n' 47 | }, { 48 | type: 6, 49 | value: ',' 50 | }, { 51 | type: 1, 52 | value: 'm' 53 | }, { 54 | type: 1, 55 | value: 'e' 56 | }, { 57 | type: 1, 58 | value: 'f' 59 | }, { 60 | type: 1, 61 | value: 'g' 62 | }, { 63 | type: 6, 64 | value: '=' 65 | }, { 66 | type: 7, 67 | value: 10 68 | }] 69 | const output = tokenizer(input) 70 | expect(JSON.stringify(output) === JSON.stringify(expected)).to.be.true 71 | }) 72 | it("用例三",function(){ 73 | const input = `let e f g=011, cc= 0b11,dd=011,ffff=011bb ,ddfd=0o90,hh='\u{fefe}', 74 | fn 75 | =null,cc = 0x20nn, cdf=0x20, zz='\u0039',ffg zzh = 'tests测试', zzn=3.1e+2, zzy=33.1E+10` 76 | const expected = [{ 77 | type: 2, 78 | value: 'let' 79 | }, { 80 | type: 1, 81 | value: 'n' 82 | }, { 83 | type: 6, 84 | value: ',' 85 | }, { 86 | type: 1, 87 | value: 'm' 88 | }, { 89 | type: 1, 90 | value: 'e' 91 | }, { 92 | type: 1, 93 | value: 'f' 94 | }, { 95 | type: 1, 96 | value: 'g' 97 | }, { 98 | type: 6, 99 | value: '=' 100 | }, { 101 | type: 7, 102 | value: 10 103 | }] 104 | const output = tokenizer(input) 105 | expect(JSON.stringify(output) === JSON.stringify(expected)).to.be.true 106 | }) 107 | }) 108 | --------------------------------------------------------------------------------