open RescriptMocha
open Mocha
open Parsec

describe("rudimentary combinators (ParserBase)", () => {
  it("should return (1, abc)", () => {
    // could be property test
    Assert.deep_equal(parse(returnP(1), "abc"), list{(1, "abc")})
  })
  it("should return (a, bc)", () => {
    // should be property test
    Assert.deep_equal(parse(item, "abc"), list{('a', "bc")})
  })
  it("should return empty list", () => {
    // should be property test
    Assert.deep_equal(parse(failure, "abc"), list{})
  })
  it("should return empty list", () => {
    // covered in a conditional of the property test
    Assert.deep_equal(parse(item, ""), list{})
  })
})
describe("Primitive", () => {
  it("digit: should return (1, 23)", () => {
    Assert.deep_equal(parse(Primitive.digit, "123"), list{('1', "23")})
  })
  it("digit: should return empty list", () => {
    Assert.deep_equal(parse(Primitive.digit, "abc"), list{})
  })
  it("checkchar: should return empty list", () => {
    Assert.deep_equal(parse(Primitive.checkchar('a'), "123"), list{})
  })
  it("checkstring: should split abcdef into (abc, def)", () => {
    Assert.deep_equal(parse(Primitive.checkstring("abc"), "abcdef"), list{("abc", "def")})
  })
  it("checkstring: should return empty list", () => {
    Assert.deep_equal(parse(Primitive.checkstring("abc"), "ab1234"), list{})
  })
  let manyRun: (t<char>, string) => list<(string, string)> = (p, str) => {
    parse(Primitive.many(fmap(x => String.make(1, x), p)), str)
  }
  let many1Run: (t<char>, string) => list<(string, string)> = (p, str) => {
    parse(Primitive.many1(fmap(x => String.make(1, x), p)), str)
  }
  it("many: should return (123,abc)", () => {
    Assert.deep_equal(
      manyRun(Primitive.digit, "123abc"),
      list{("123", "abc")},
    )
  })
  it("many (without run helper): should return (123, abc)", () => {
    Assert.deep_equal(
      parse(Primitive.many(Primitive.digitString), "123abc"),
      list{("123", "abc")}
    )
  })
  it("many: should return (<empt>, abcdef)", () => {
    Assert.deep_equal(
      manyRun(Primitive.digit, "abcdef"),
      list{("", "abcdef")},
    )
  })
  it("many1: should return empty list", () => {
    Assert.deep_equal(
      many1Run(Primitive.digit, "abcdef"),
      list{}
    )
  })
  it("many1: should return abcdef", () => {
    Assert.deep_equal(
      parse(Primitive.many1(Primitive.lowerString), "abcdef"),
      list{("abcdef", "")}
    )
  })
  it("many1: should return (abc, Def)", () => {
    Assert.deep_equal(
      parse(Primitive.many1(Primitive.lowerString), "abcDef"),
      list{("abc", "Def")}
    )
  })
  it("many: should return (abc, Def)", () => {
    Assert.deep_equal(
      parse(Primitive.many(Primitive.lowerString), "abcDef"),
      list{("abc", "Def")}
    )
  })

  it("nat: should return (123, _abc)", () => {
    Assert.deep_equal(
      parse(Primitive.nat, "123 abc"),
      list{(123, " abc")}
    )
  })
})

describe("whitespace-insensitive lists", () => {
  let ident: t<string> = bind(
    Primitive.lower,
    x => bind(
      Primitive.many(Primitive.alphanumString),
      xs => returnP(Js.String2.concat(String.make(1, x), xs))))

  let identifier: t<string> = Primitive.token(ident)

  describe("of strings (identifier)", () => {
    let listStringParser: t<list<string>> = {
      bind(
        Primitive.symbol("list{"),
        _ => {
          bind(
            identifier,
            n => bind(
              Primitive.many(bind(Primitive.symbol(","), _ => identifier)),
              ns => bind(Primitive.symbol("}"), _ => returnP(list{n, ns}))
            )
          )
        }
      )
    }

    it("returns list{ab, cd, ef} (with newline) THIS TEST IS WRONG", () => {
      Assert.deep_equal(
        parse(listStringParser, " list{ ab \n, cd, ef } "),
        list{(list{"ab", "cdef"}, "")}
      )
    })
  })
})