Haxe 没有 Literal 类型？

Question

TypeScript 和 Python（3.8.x 及更高版本）支持文字类型，但看起来 Haxe 不\xe2\x80\x99t（目前）。

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我需要将一个字符串传递给函数，而不需要像下面的代码那样出现拼写错误。

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打字稿：

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type LiteralStatus = "modified" | "corrupted";\n\nclass tsFile {\n  status: string;\n  constructor() {\n    this.status = "new";\n  }\n  set_status(status: LiteralStatus) {\n    this.status = status;\n  }\n  get_status() {\n    return this.status;\n  }\n}\n\nconst file = new(tsFile)\n\nconsole.log(file.get_status()); // new\n\nfile.set_status("modified"); // modified\nconsole.log(file.get_status());\n\n// file.set_status("classified") // Throws an exception because argument is not assignable to parameter\n// file.set_status() // Throws an exception because the function was expecting for at least one argument\n\nfile.set_status("corrupted"); // corrupted\nconsole.log(file.get_status())\n

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Python：

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from typing import Literal\n\nclass pyFile():\n  def __init__(self):\n    self.status = "new"\n\n  def set_status(self, status: Literal["modified", "corrupted"]):\n    self.status = status\n    \n  def get_status(self):\n    return self.status\n\nfile = pyFile()\n\nprint(file.get_status()) # new\n\nfile.set_status("modified") # modified\nprint(file.get_status())\n\n# file.set_status("classified") # Throws the TypeError exception\n# file.set_status() # Throws the TypeError exception\n\nfile.set_status("corrupted") # corrupted\nprint(file.get_status())\n

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在 Haxe 中创建这些文字类型的最佳模式是什么？

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Answer 1

您可以使用枚举摘要

enum abstract Status(String) from String {
    var Modified = "modified";
    var Corrupted = "corrupted";
}


class File {
    var status:Status = "new";
    
    public function new() {}
    
    public function get_status():Status {
        return status;
    }
    
    public function set_status(status:Status) {
        this.status = status;
    }
}

function main() {
  final file = new File();
  trace(file.get_status());

  file.set_status(Modified);
  trace(file.get_status());

  file.set_status(Corrupted);
  trace(file.get_status());
}

https://try.haxe.org/#95E9203E