regexp-convert.test.ts

import { expect, test } from "bun:test";
import { convertRegexpToGbnf } from "./regexp-convert";

const tests: Array<[string, string]> = [
  [
    "^[0-9]+( days| weeks| months)?$",
    `[0-9]+ (" days" | " weeks" | " months")?`,
  ],
  [
    "^[0-9]+ ( days| weeks| months)?$",
    `[0-9]+ " " (" days" | " weeks" | " months")?`,
  ],
  ["^[0-9]{2,4}$", `[0-9] [0-9] [0-9]? [0-9]?`],
  ["^[0-9]{0,4}$", `[0-9]? [0-9]? [0-9]? [0-9]?`],
  ["^[0-9]{2,}$", `[0-9] [0-9] [0-9]*`],
  ["^\\w$", `[0-9A-Za-z_]`],
  ["^\\w+$", `[0-9A-Za-z_]+`],
  ["^\\w{0,2}$", `[0-9A-Za-z_]? [0-9A-Za-z_]?`],
  ["^\\w{3,}$", `[0-9A-Za-z_] [0-9A-Za-z_] [0-9A-Za-z_] [0-9A-Za-z_]*`],
  ["^\\.$", `"."`],
  ["^.$", `string-char`],
  ["", `(string-char)*`],
  ["a", `(string-char)* "a" (string-char)*`],
  ["^a", `"a" (string-char)*`],
  ["^a$", `"a"`],
  ["a$", `(string-char)* "a"`],
  ["^.*$", `(string-char)*`],
];

tests.forEach(([regexp, gbnf]) => {
  test(`Convert Regexp: ${regexp}`, () => {
    const resultGbnf = convertRegexpToGbnf(regexp);
    expect(resultGbnf).toBe(gbnf);
  });
});

const unsupported = ["(^a|b$)"];
unsupported.forEach((regexp) => {
  test(`Unsupported Regexp: ${regexp}`, () => {
    expect(() => convertRegexpToGbnf(regexp)).toThrow();
  });
});