tiny-compiler

尝试编写一个简单的编译器，感谢the-super-tiny-compiler。

这个编译器的功能是：将dart函数命名参数调用形式

sayHello(name: "shymean", msg: 'hello');

转换为javascript函数参数调用

sayHello({name: 'shymean', msg: 'hello'})

看起来只要加一对大括号就行了吗？不，我们将学习编译原理，并了解编译器的基本工作流程。

词法分析

首先分析输入源代码

let input = `sayHello(userName:getUsername("shymean"), msg:"hello");`;

将其拆分成一系列token

[ { type: 'name', value: 'sayHello' },
  { type: 'paren', value: '(' },
  { type: 'name', value: 'userName' },
  { type: 'colon', value: ':' },
  { type: 'name', value: 'getUsername' },
  { type: 'paren', value: '(' },
  { type: 'string', value: 'shymean' },
  { type: 'paren', value: ')' },
  { type: 'comma', value: ',' },
  { type: 'name', value: 'msg' },
  { type: 'colon', value: ':' },
  { type: 'string', value: 'hello' },
  { type: 'paren', value: ')' }

语法分析

根据词法分析获取的token，然后将其转换成AST

{
    type: "Program",
    body: [
        {
            type: "CallExpression",
            name: "sayHello",
            params: [
                {
                    type: "NameParam",
                    name: "userName",
                    value: {
                        type: "CallExpression",
                        name: "getUsername",
                        params: [{ type: "StringLiteral", value: "shymean" }]
                    }
                },
                {
                    type: "NameParam",
                    name: "msg",
                    value: { type: "StringLiteral", value: "hello" }
                }
            ]
        }
    ]
}

代码生成

最后根据AST，输出JavaScript代码

sayHello({userName:getUsername("shymean"), msg:"hello"})

如果从源代码获取的AST直接转换成JS代码比较麻烦，还可以进行中间步骤，即遍历旧的AST，然后输出更符合JavaScript语义的新AST，然后根据新的AST，输出JS代码

tangxiangmin/tiny-compiler

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