schala/schala-lang/language/src/parsing/test.rs

#![cfg(test)]
use ::std::rc::Rc;
use std::str::FromStr;

use super::tokenize;
use super::ParseResult;
use crate::ast::{AST, Meta, Expression, Statement, IfExpressionBody, Discriminator, Pattern, PatternLiteral, TypeBody, Enumerator, ForBody, InvocationArgument, FormalParam, PrefixOp, BinOp, QualifiedName};
use super::Statement::*;
use super::Declaration::*;
use super::Signature;
use super::TypeIdentifier::*;
use super::TypeSingletonName;
use super::ExpressionKind::*;
use super::Variant::*;
use super::ForBody::*;

fn parse(input: &str) -> ParseResult<AST> {
  let tokens: Vec<crate::tokenizing::Token> = tokenize(input);
  let mut parser = super::Parser::new(tokens);
  parser.parse()
}

macro_rules! parse_test {
  ($string:expr, $correct:expr) => { assert_eq!(parse($string).unwrap(), $correct) };
}
macro_rules! parse_test_wrap_ast {
  ($string:expr, $correct:expr) => { parse_test!($string, AST(vec![$correct])) }
}
macro_rules! parse_error {
  ($string:expr) => { assert!(parse($string).is_err()) }
}
macro_rules! val {
  ($var:expr) => { Value(QualifiedName(vec![Rc::new($var.to_string())])) };
}
macro_rules! ty {
  ($name:expr) => { Singleton(tys!($name)) }
}
macro_rules! tys {
  ($name:expr) => { TypeSingletonName { name: Rc::new($name.to_string()), params: vec![] } };
}

macro_rules! ex {
  ($expr_type:expr) => { Expression::new($expr_type) };
  (m $expr_type:expr) => { Meta::new(Expression::new($expr_type)) };
  (m $expr_type:expr, $type_anno:expr) => { Meta::new(Expression::with_anno($expr_type, $type_anno)) };
  (s $expr_text:expr) => {
    {
      let tokens: Vec<crate::tokenizing::Token> = tokenize($expr_text);
      let mut parser = super::Parser::new(tokens);
      parser.expression().unwrap()
    }
  };
}

macro_rules! inv {
  ($expr_type:expr) => { Meta::new(InvocationArgument::Positional($expr_type)) }
}

macro_rules! binexp {
  ($op:expr, $lhs:expr, $rhs:expr) => { BinExp(BinOp::from_sigil($op), bx!(Expression::new($lhs).into()), bx!(Expression::new($rhs).into())) }
}
macro_rules! prefexp {
  ($op:expr, $lhs:expr) => { PrefixExp(PrefixOp::from_str($op).unwrap(), bx!(Expression::new($lhs).into())) }
}
macro_rules! exst {
  ($expr_type:expr) => { Meta::new(Statement::ExpressionStatement(Expression::new($expr_type).into())) };
  ($expr_type:expr, $type_anno:expr) => { Meta::new(Statement::ExpressionStatement(Expression::with_anno($expr_type, $type_anno).into())) };
  ($op:expr, $lhs:expr, $rhs:expr) => { Meta::new(Statement::ExpressionStatement(ex!(binexp!($op, $lhs, $rhs)))) };
  (s $statement_text:expr) => {
    {
      let tokens: Vec<crate::tokenizing::Token> = tokenize($statement_text);
      let mut parser = super::Parser::new(tokens);
      Meta::new(parser.statement().unwrap())
    }
  }
}

#[test]
fn parsing_number_literals_and_binexps() {
  parse_test_wrap_ast! { ".2", exst!(FloatLiteral(0.2)) };
  parse_test_wrap_ast! { "8.1", exst!(FloatLiteral(8.1)) };

  parse_test_wrap_ast! { "0b010", exst!(NatLiteral(2)) };
  parse_test_wrap_ast! { "0b0_1_0_", exst!(NatLiteral(2)) }

  parse_test_wrap_ast! {"0xff", exst!(NatLiteral(255)) };
  parse_test_wrap_ast! {"0xf_f_", exst!(NatLiteral(255)) };

  parse_test_wrap_ast! {"0xf_f_+1", exst!(binexp!("+", NatLiteral(255), NatLiteral(1))) };

  parse_test! {"3; 4; 4.3", AST(
    vec![exst!(NatLiteral(3)), exst!(NatLiteral(4)),
      exst!(FloatLiteral(4.3))])
  };

  parse_test!("1 + 2 * 3", AST(vec!
    [
      exst!(binexp!("+", NatLiteral(1), binexp!("*", NatLiteral(2), NatLiteral(3))))
    ]));

  parse_test!("1 * 2 + 3", AST(vec!
    [
      exst!(binexp!("+", binexp!("*", NatLiteral(1), NatLiteral(2)), NatLiteral(3)))
    ]));

  parse_test!("1 && 2", AST(vec![exst!(binexp!("&&", NatLiteral(1), NatLiteral(2)))]));

  parse_test!("1 + 2 * 3 + 4", AST(vec![exst!(
    binexp!("+",
      binexp!("+", NatLiteral(1), binexp!("*", NatLiteral(2), NatLiteral(3))),
      NatLiteral(4)))]));

  parse_test!("(1 + 2) * 3", AST(vec!
    [exst!(binexp!("*", binexp!("+", NatLiteral(1), NatLiteral(2)), NatLiteral(3)))]));

  parse_test!(".1 + .2", AST(vec![exst!(binexp!("+", FloatLiteral(0.1), FloatLiteral(0.2)))]));
  parse_test!("1 / 2", AST(vec![exst!(binexp!("/", NatLiteral(1), NatLiteral(2)))]));
}

#[test]
fn parsing_tuples() {
  parse_test!("()", AST(vec![exst!(TupleLiteral(vec![]))]));
  parse_test!("(\"hella\", 34)", AST(vec![exst!(
    TupleLiteral(
      vec![ex!(s r#""hella""#).into(), ex!(s "34").into()]
    )
  )]));
  parse_test!("((1+2), \"slough\")", AST(vec![exst!(TupleLiteral(vec![
    ex!(binexp!("+", NatLiteral(1), NatLiteral(2))).into(),
    ex!(StringLiteral(rc!(slough))).into(),
  ]))]))
}

#[test]
fn parsing_identifiers() {
  parse_test!("a", AST(vec![exst!(val!("a"))]));
  parse_test!("some_value", AST(vec![exst!(val!("some_value"))]));
  parse_test!("a + b", AST(vec![exst!(binexp!("+", val!("a"), val!("b")))]));
  //parse_test!("a[b]", AST(vec![Expression(
  //parse_test!("a[]", <- TODO THIS NEEDS TO FAIL
  //parse_test("a()[b]()[d]")
  //TODO fix this parsing stuff
  /*
  parse_test! { "perspicacity()[a]", AST(vec![
    exst!(Index {
      indexee: bx!(ex!(Call { f: bx!(ex!(val!("perspicacity"))), arguments: vec![] })),
      indexers: vec![ex!(val!("a"))]
    })
  ]) 
  }
  */
  parse_test!("a[b,c]", AST(vec![exst!(Index { indexee: bx!(ex!(m val!("a"))), indexers: vec![ex!(m val!("b")), ex!(m val!("c"))]} )]));

  parse_test!("None", AST(vec![exst!(val!("None"))]));
  parse_test!("Pandas {  a: x + y }", AST(vec![
    exst!(NamedStruct { name: QualifiedName(vec![rc!(Pandas)]), fields: vec![(rc!(a), ex!(m binexp!("+", val!("x"), val!("y"))))]})
  ]));
  parse_test! { "Pandas { a: n, b: q, }",
  AST(vec![
      exst!(NamedStruct { name: QualifiedName(vec![rc!(Pandas)]), fields:
        vec![(rc!(a), ex!(m val!("n"))), (rc!(b), ex!(m val!("q")))]
        }
      )
    ])
  };
}


#[test]
fn qualified_identifiers() {
  parse_test_wrap_ast! {
    "let q_q = Yolo::Swaggins",
    Meta::new(Declaration(Binding { name: rc!(q_q), constant: true, type_anno: None,
      expr: Meta::new(Expression::new(Value(QualifiedName(vec![rc!(Yolo), rc!(Swaggins)])))),
    }))
  }

  parse_test_wrap_ast! {
    "thing::item::call()",
    exst!(Call { f: bx![ex!(m Value(QualifiedName(vec![rc!(thing), rc!(item), rc!(call)])))], arguments: vec![] })
  }
}

#[test]
fn reserved_words() {
  parse_error!("module::item::call()");
}

#[test]
fn parsing_complicated_operators() {
  parse_test!("a <- b", AST(vec![exst!(binexp!("<-", val!("a"), val!("b")))]));
  parse_test!("a || b", AST(vec![exst!(binexp!("||", val!("a"), val!("b")))]));
  parse_test!("a<>b", AST(vec![exst!(binexp!("<>", val!("a"), val!("b")))]));
  parse_test!("a.b.c.d", AST(vec![exst!(binexp!(".",
                                              binexp!(".",
                                                binexp!(".", val!("a"), val!("b")),
                                              val!("c")),
                                              val!("d")))]));
  parse_test!("-3", AST(vec![exst!(prefexp!("-", NatLiteral(3)))]));
  parse_test!("-0.2", AST(vec![exst!(prefexp!("-", FloatLiteral(0.2)))]));
  parse_test!("!3", AST(vec![exst!(prefexp!("!", NatLiteral(3)))]));
  parse_test!("a <- -b", AST(vec![exst!(binexp!("<-", val!("a"), prefexp!("-", val!("b"))))]));
  parse_test!("a <--b", AST(vec![exst!(binexp!("<--", val!("a"), val!("b")))]));
}

#[test]
fn parsing_functions() {
  parse_test!("fn oi()",  AST(vec![Meta::new(Declaration(FuncSig(Signature { name: rc!(oi), operator: false, params: vec![], type_anno: None })))]));
  parse_test!("oi()", AST(vec![exst!(Call { f: bx!(ex!(m val!("oi"))), arguments: vec![] })]));
  parse_test!("oi(a, 2 + 2)", AST(vec![exst!(Call
  { f: bx!(ex!(m val!("oi"))),
    arguments: vec![inv!(ex!(val!("a"))).into(), inv!(ex!(binexp!("+", NatLiteral(2), NatLiteral(2)))).into()]
  })]));
  parse_error!("a(b,,c)");

  parse_test!("fn a(b, c: Int): Int", AST(vec![Meta::new(Declaration(
    FuncSig(Signature { name: rc!(a), operator: false, params: vec![
      FormalParam { name: rc!(b), anno: None, default: None },
      FormalParam { name: rc!(c), anno: Some(ty!("Int")), default: None }
    ], type_anno: Some(ty!("Int")) })))]));


  parse_test!("fn a(x) { x() }", AST(vec![Meta::new(Declaration(
    FuncDecl(Signature { name: rc!(a), operator: false, params: vec![FormalParam { name: rc!(x), anno: None, default: None }], type_anno: None },
      vec![exst!(Call { f: bx!(ex!(m val!("x"))), arguments: vec![] })])))]));
  parse_test!("fn a(x) {\n x() }", AST(vec![Meta::new(Declaration(
    FuncDecl(Signature { name: rc!(a), operator: false, params: vec![FormalParam { name: rc!(x), anno: None, default: None }], type_anno: None },
      vec![exst!(Call { f: bx!(ex!(m val!("x"))), arguments: vec![] })])))]));

  let multiline = r#"
fn a(x) {
x()
}
"#;
  parse_test!(multiline, AST(vec![Meta::new(Declaration(
    FuncDecl(Signature { name: rc!(a), operator: false, params: vec![FormalParam { name: rc!(x), default: None, anno: None }], type_anno: None },
      vec![exst!(Call { f: bx!(ex!(m val!("x"))), arguments: vec![] })])))]));
  let multiline2 = r#"
fn a(x) {

x()

}
"#;
  parse_test!(multiline2, AST(vec![Meta::new(Declaration(
    FuncDecl(Signature { name: rc!(a), operator: false, params: vec![FormalParam { name: rc!(x), default: None, anno: None }], type_anno: None },
      vec![exst!(s "x()")])))]));
}

#[test]
fn functions_with_default_args() {
  parse_test! {
    "fn func(x: Int, y: Int = 4) { }",
    AST(vec![
      Meta::new(Declaration(
        FuncDecl(Signature { name: rc!(func), operator: false, type_anno: None, params: vec![
          FormalParam { name: rc!(x), default: None, anno: Some(ty!("Int")) },
          FormalParam { name: rc!(y), default: Some(ex!(s "4")), anno: Some(ty!("Int")) }
        ]}, vec![])
      ))
    ])
  };
}

#[test]
fn parsing_bools() {
  parse_test!("false", AST(vec![exst!(BoolLiteral(false))]));
  parse_test!("true", AST(vec![exst!(BoolLiteral(true))]));
}

#[test]
fn parsing_strings() {
  parse_test!(r#""hello""#, AST(vec![exst!(StringLiteral(rc!(hello)))]));
}

#[test]
fn parsing_types() {
  parse_test!("type Yolo = Yolo", AST(vec![Meta::new(Declaration(TypeDecl { name: tys!("Yolo"), body: TypeBody(vec![UnitStruct(rc!(Yolo))]), mutable: false} ))]));
  parse_test!("type mut Yolo = Yolo", AST(vec![Meta::new(Declaration(TypeDecl { name: tys!("Yolo"), body: TypeBody(vec![UnitStruct(rc!(Yolo))]), mutable: true} ))]));
  parse_test!("type alias Sex = Drugs", AST(vec![Meta::new(Declaration(TypeAlias(rc!(Sex), rc!(Drugs))))]));
  parse_test!("type Sanchez = Miguel | Alejandro(Int, Option<a>) | Esperanza { a: Int, b: String }",
  AST(vec![Meta::new(Declaration(TypeDecl{
    name: tys!("Sanchez"),
    body: TypeBody(vec![
      UnitStruct(rc!(Miguel)),
      TupleStruct(rc!(Alejandro), vec![
        Singleton(TypeSingletonName { name: rc!(Int), params: vec![] }),
        Singleton(TypeSingletonName { name: rc!(Option), params: vec![Singleton(TypeSingletonName { name: rc!(a), params: vec![] })] }),
      ]),
      Record{
        name: rc!(Esperanza),
        members: vec![
          (rc!(a), Singleton(TypeSingletonName { name: rc!(Int), params: vec![] })),
          (rc!(b), Singleton(TypeSingletonName { name: rc!(String), params: vec![] })),
        ]
      }
    ]),
    mutable: false
  }))]));

  parse_test!("type Jorge<a> = Diego | Kike(a)", AST(vec![
    Meta::new(Declaration(TypeDecl{
      name: TypeSingletonName { name: rc!(Jorge), params: vec![Singleton(TypeSingletonName { name: rc!(a), params: vec![] })] },
      body: TypeBody(vec![UnitStruct(rc!(Diego)), TupleStruct(rc!(Kike), vec![Singleton(TypeSingletonName { name: rc!(a), params: vec![] })])]),
      mutable: false
    }
  ))]));
}

#[test]
fn parsing_bindings() {
  parse_test!("let mut a = 10", AST(vec![Meta::new(Declaration(Binding { name: rc!(a), constant: false, type_anno: None, expr: ex!(m NatLiteral(10)) } ))]));
  parse_test!("let a = 2 + 2", AST(vec![Meta::new(Declaration(Binding { name: rc!(a), constant: true, type_anno: None, expr: ex!(m binexp!("+", NatLiteral(2), NatLiteral(2))) }) )]));
  parse_test!("let a: Nat = 2 + 2", AST(vec![Meta::new(Declaration(
    Binding { name: rc!(a), constant: true, type_anno: Some(Singleton(TypeSingletonName { name: rc!(Nat), params: vec![] })),
    expr: Meta::new(ex!(binexp!("+", NatLiteral(2), NatLiteral(2)))) }
  ))]));
}

#[test]
fn parsing_block_expressions() {
  parse_test! {
    "if a() then { b(); c() }", AST(vec![exst!(
      IfExpression {
        discriminator: bx! {
          Discriminator::Simple(ex!(Call { f: bx!(ex!(m val!("a"))), arguments: vec![]}))
        },
        body: bx! {
          IfExpressionBody::SimpleConditional(
            vec![exst!(Call { f: bx!(ex!(m val!("b"))), arguments: vec![]}), exst!(Call { f: bx!(ex!(m val!("c"))), arguments: vec![] })],
            None
          )
        }
      }
    )])
  };

  parse_test! {
    "if a() then { b(); c() } else { q }", AST(vec![exst!(
      IfExpression {
        discriminator: bx! {
          Discriminator::Simple(ex!(Call { f: bx!(ex!(m val!("a"))), arguments: vec![]}))
        },
        body: bx! {
          IfExpressionBody::SimpleConditional(
            vec![exst!(Call { f: bx!(ex!(m val!("b"))), arguments: vec![]}), exst!(Call { f: bx!(ex!(m val!("c"))), arguments: vec![] })],
            Some(
              vec![exst!(val!("q"))],
            )
          )
        }
      }
    )])
  };

  /*
  parse_test!("if a() then { b(); c() }", AST(vec![exst!(
      IfExpression(bx!(ex!(Call { f: bx!(ex!(val!("a"))), arguments: vec![]})),
        vec![exst!(Call { f: bx!(ex!(val!("b"))), arguments: vec![]}), exst!(Call { f: bx!(ex!(val!("c"))), arguments: vec![] })],
        None)
      )]));
  parse_test!(r#"
  if true then {
    const a = 10
    b
  } else {
    c
  }"#,
  AST(vec![exst!(IfExpression(bx!(ex!(BoolLiteral(true))),
    vec![Declaration(Binding { name: rc!(a), constant: true, expr: ex!(NatLiteral(10)) }),
          exst!(val!(rc!(b)))],
    Some(vec![exst!(val!(rc!(c)))])))])
  );

  parse_test!("if a { b } else { c }", AST(vec![exst!(
        IfExpression(bx!(ex!(val!("a"))),
          vec![exst!(val!("b"))],
          Some(vec![exst!(val!("c"))])))]));

  parse_test!("if (A {a: 1}) { b } else { c }", AST(vec![exst!(
        IfExpression(bx!(ex!(NamedStruct { name: rc!(A), fields: vec![(rc!(a), ex!(NatLiteral(1)))]})),
          vec![exst!(val!("b"))],
          Some(vec![exst!(val!("c"))])))]));

  parse_error!("if A {a: 1} { b } else { c }");
  */
}
#[test]
fn parsing_interfaces() {
  parse_test!("interface Unglueable { fn unglue(a: Glue); fn mar(): Glue }", AST(vec![
    Meta::new(Declaration(Interface {
      name: rc!(Unglueable),
      signatures: vec![
        Signature {
          name: rc!(unglue),
          operator: false,
          params: vec![
            FormalParam { name: rc!(a), anno: Some(Singleton(TypeSingletonName { name: rc!(Glue), params: vec![] })), default: None }
          ],
          type_anno: None
        },
        Signature { name: rc!(mar), operator: false, params: vec![], type_anno: Some(Singleton(TypeSingletonName { name: rc!(Glue), params: vec![] })) },
      ]
    }))
  ]));
}

#[test]
fn parsing_impls() {
  parse_test!("impl Heh { fn yolo(); fn swagg(); }", AST(vec![
    Meta::new(
    Declaration(Impl {
      type_name: ty!("Heh"),
      interface_name: None,
      block: vec![
        FuncSig(Signature { name: rc!(yolo), operator: false, params: vec![], type_anno: None }),
        FuncSig(Signature { name: rc!(swagg), operator: false, params: vec![], type_anno: None })
      ] }))]));

  parse_test!("impl Mondai for Lollerino { fn yolo(); fn swagg(); }", AST(vec![
    Meta::new(Declaration(Impl {
      type_name: ty!("Lollerino"),
      interface_name: Some(TypeSingletonName { name: rc!(Mondai), params: vec![] }),
      block: vec![
        FuncSig(Signature { name: rc!(yolo), operator: false, params: vec![], type_anno: None}),
        FuncSig(Signature { name: rc!(swagg), operator: false, params: vec![], type_anno: None })
      ] }))]));

  parse_test!("impl Hella<T> for (Alpha, Omega) { }", AST(vec![
    Meta::new(Declaration(Impl {
      type_name: Tuple(vec![ty!("Alpha"), ty!("Omega")]),
      interface_name: Some(TypeSingletonName { name: rc!(Hella), params: vec![ty!("T")] }),
      block: vec![]
    }))
  ]));

  parse_test!("impl Option<WTFMate> { fn oi() }", AST(vec![
    Meta::new(
    Declaration(Impl {
      type_name: Singleton(TypeSingletonName { name: rc!(Option), params: vec![ty!("WTFMate")]}),
      interface_name: None,
      block: vec![
        FuncSig(Signature { name: rc!(oi), operator: false, params: vec![], type_anno: None }),
      ]
    }))]));
}

#[test]
fn parsing_type_annotations() {
  parse_test!("let a = b : Int", AST(vec![
    Meta::new(
    Declaration(Binding { name: rc!(a), constant: true, type_anno: None, expr:
      ex!(m val!("b"), ty!("Int")) }))]));

  parse_test!("a : Int", AST(vec![
    exst!(val!("a"), ty!("Int"))
  ]));

  parse_test!("a : Option<Int>", AST(vec![
    exst!(val!("a"), Singleton(TypeSingletonName { name: rc!(Option), params: vec![ty!("Int")] }))
  ]));

  parse_test!("a : KoreanBBQSpecifier<Kimchi, Option<Bulgogi> >", AST(vec![
    exst!(val!("a"), Singleton(TypeSingletonName { name: rc!(KoreanBBQSpecifier), params: vec![
      ty!("Kimchi"), Singleton(TypeSingletonName { name: rc!(Option), params: vec![ty!("Bulgogi")] })
    ] }))
  ]));

  parse_test!("a : (Int, Yolo<a>)", AST(vec![
    exst!(val!("a"), Tuple(
      vec![ty!("Int"), Singleton(TypeSingletonName {
        name: rc!(Yolo), params: vec![ty!("a")]
      })]))]));
}

#[test]
fn parsing_lambdas() {
  parse_test_wrap_ast! { r#"\(x) { x + 1}"#, exst!(
      Lambda { params: vec![FormalParam { name: rc!(x), anno: None, default: None } ], type_anno: None, body: vec![exst!(s "x + 1")] }
    )
  }

  parse_test!(r#"\  (x: Int, y) { a;b;c;}"#, AST(vec![
    exst!(Lambda {
      params: vec![
        FormalParam { name: rc!(x), anno: Some(ty!("Int")), default: None },
        FormalParam { name: rc!(y), anno: None, default: None }
      ],
      type_anno: None,
      body: vec![exst!(s "a"), exst!(s "b"), exst!(s "c")]
    })
  ]));

  parse_test!(r#"\(x){y}(1)"#, AST(vec![
    exst!(Call { f: bx!(ex!(m
      Lambda {
        params: vec![
          FormalParam { name: rc!(x), anno: None, default: None }
        ],
        type_anno: None,
        body: vec![exst!(s "y")] }
      )),
      arguments: vec![inv!(ex!(NatLiteral(1))).into()] })]));

  parse_test_wrap_ast! {
    r#"\(x: Int): String { "q" }"#,
    exst!(Lambda {
      params: vec![
        FormalParam { name: rc!(x), anno: Some(ty!("Int")), default: None },
      ],
      type_anno: Some(ty!("String")),
      body: vec![exst!(s r#""q""#)]
    })
  }
}

#[test]
fn single_param_lambda() {
  parse_test_wrap_ast! {
    r"\x { x + 10 }",
    exst!(Lambda {
      params: vec![FormalParam { name: rc!(x), anno: None, default: None }],
      type_anno: None,
      body: vec![exst!(s r"x + 10")]
    })
  }

  parse_test_wrap_ast! {
    r"\x: Nat { x + 10 }",
    exst!(Lambda {
      params: vec![FormalParam { name: rc!(x), anno: Some(ty!("Nat")), default: None }],
      type_anno: None,
      body: vec![exst!(s r"x + 10")]
    })
  }
}

#[test]
fn more_advanced_lambdas() {
  parse_test! {
    r#"fn wahoo() { let a = 10; \(x) { x + a } };
    wahoo()(3) "#,  AST(vec![
      exst!(s r"fn wahoo() { let a = 10; \(x) { x + a } }"),
      exst! {
        Call {
          f: bx!(ex!(m Call { f: bx!(ex!(m val!("wahoo"))), arguments: vec![] })),
          arguments: vec![inv!(ex!(NatLiteral(3))).into()],
        }
      }
    ])
  }
}

#[test]
  fn list_literals() {
    parse_test! {
      "[1,2]", AST(vec![
        exst!(ListLiteral(vec![ex!(m NatLiteral(1)), ex!(m NatLiteral(2))]))])
    };
  }

#[test]
fn while_expr() {
  parse_test! {
    "while { }", AST(vec![
    exst!(WhileExpression { condition: None, body: vec![] })])
  }

  parse_test! {
    "while a == b { }", AST(vec![
    exst!(WhileExpression { condition: Some(bx![ex![m binexp!("==", val!("a"), val!("b"))]]), body: vec![] })])
  }
}

#[test]
fn for_expr() {
  parse_test! {
    "for { a <- maybeValue } return 1", AST(vec![
    exst!(ForExpression {
      enumerators: vec![Enumerator { id: rc!(a), generator: ex!(m val!("maybeValue")) }],
      body: bx!(MonadicReturn(Meta::new(ex!(s "1"))))
    })])
  }

  parse_test! {
    "for n <- someRange { f(n); }", AST(vec![
    exst!(ForExpression { enumerators: vec![Enumerator { id: rc!(n), generator: ex!(m val!("someRange"))}],
      body: bx!(ForBody::StatementBlock(vec![exst!(s "f(n)")]))
    })])
  }
}

#[test]
fn patterns() {
  parse_test_wrap_ast! {
    "if x is Some(a) then { 4 } else { 9 }", exst!(
      IfExpression {
        discriminator: bx!(Discriminator::Simple(ex!(s "x"))),
        body: bx!(IfExpressionBody::SimplePatternMatch(Pattern::TupleStruct(rc!(Some), vec![Pattern::Literal(PatternLiteral::VarPattern(rc!(a)))]), vec![exst!(s "4")], Some(vec![exst!(s "9")]))) }
      )
  }

  parse_test_wrap_ast! {
    "if x is Some(a) then 4 else 9", exst!(
      IfExpression {
        discriminator: bx!(Discriminator::Simple(ex!(s "x"))),
        body: bx!(IfExpressionBody::SimplePatternMatch(Pattern::TupleStruct(rc!(Some), vec![Pattern::Literal(PatternLiteral::VarPattern(rc!(a)))]), vec![exst!(s "4")], Some(vec![exst!(s "9")]))) }
    )
  }

  parse_test_wrap_ast! {
    "if x is Something { a, b: x } then { 4 } else { 9 }", exst!(
      IfExpression {
        discriminator: bx!(Discriminator::Simple(ex!(s "x"))),
        body: bx!(IfExpressionBody::SimplePatternMatch(
            Pattern::Record(rc!(Something), vec![
              (rc!(a),Pattern::Literal(PatternLiteral::StringPattern(rc!(a)))),
              (rc!(b),Pattern::Literal(PatternLiteral::VarPattern(rc!(x)))) 
            ]),
            vec![exst!(s "4")], Some(vec![exst!(s "9")]))) 
      }
    )
  }
}

#[test]
fn pattern_literals() {
  parse_test_wrap_ast! {
    "if x is -1 then 1 else 2",
    exst!(
      IfExpression {
        discriminator: bx!(Discriminator::Simple(ex!(s "x"))),
        body: bx!(IfExpressionBody::SimplePatternMatch(
          Pattern::Literal(PatternLiteral::NumPattern { neg: true, num: NatLiteral(1) }),
          vec![exst!(NatLiteral(1))],
          Some(vec![exst!(NatLiteral(2))]),
        ))
      }
    )
  }

  parse_test_wrap_ast! {
    "if x is 1 then 1 else 2", 
    exst!(
      IfExpression {
        discriminator: bx!(Discriminator::Simple(ex!(s "x"))),
        body: bx!(IfExpressionBody::SimplePatternMatch(
            Pattern::Literal(PatternLiteral::NumPattern { neg: false, num: NatLiteral(1) }),
            vec![exst!(s "1")],
            Some(vec![exst!(s "2")]),
            ))
      }
    )
  }

  parse_test! {
    "if x is true then 1 else 2", AST(vec![
      exst!(
        IfExpression {
          discriminator: bx!(Discriminator::Simple(ex!(s "x"))),
          body: bx!(IfExpressionBody::SimplePatternMatch(
            Pattern::Literal(PatternLiteral::BoolPattern(true)),
            vec![exst!(NatLiteral(1))],
            Some(vec![exst!(NatLiteral(2))]),
          ))
        }
      )
    ])
  }

  parse_test_wrap_ast! {
    "if x is \"gnosticism\" then 1 else 2",
      exst!(
        IfExpression {
          discriminator: bx!(Discriminator::Simple(ex!(s "x"))),
          body: bx!(IfExpressionBody::SimplePatternMatch(
              Pattern::Literal(PatternLiteral::StringPattern(rc!(gnosticism))),
              vec![exst!(s "1")],
              Some(vec![exst!(s "2")]),
              ))
        }
      )
  }
}