1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177

use lalrpop_util::lalrpop_mod;
use thiserror::Error;

pub mod ast;
lalrpop_mod!(#[allow(clippy::all)] pub grammar);

#[derive(Debug, Error, Clone)]
pub enum SyntaxError {
  #[error("Unexpected character '{1}' on line {0}.")]
  UnexpectedCharacter(usize, char),
  #[error("Unterminated string on line {0}.")]
  UnterminatedString(usize),
}
pub type Result<T> = std::result::Result<T, SyntaxError>;

mod tests {
  #![allow(unused_imports)]
  use crate::{
    ast::Expr,
    grammar::{ExprParser, StmtParser},
  };

  #[test]
  fn parse_function_stmt() {
    let stmt = StmtParser::new().parse("fn test() { 3 };").unwrap();
    assert_eq!(
      &format!("{:?}", stmt),
      r#"Function("test", [], Block([], Some(Constant(Number(3.0)))))"#
    );
    let stmt = StmtParser::new()
      .parse("fn test(t1, t2, t3,) { 3 };")
      .unwrap();
    assert_eq!(
      &format!("{:?}", stmt),
      r#"Function("test", ["t1", "t2", "t3"], Block([], Some(Constant(Number(3.0)))))"#
    );
  }

  #[test]
  fn parse_declaration_stmt() {
    let stmt = StmtParser::new().parse("const test = 5.2 * 3;").unwrap();
    assert_eq!(
      &format!("{:?}", stmt),
      r#"Const("test", Binary(Constant(Number(5.2)), Multiply, Constant(Number(3.0))))"#
    );

    let stmt = StmtParser::new().parse("let test = 5.2 * 3;").unwrap();
    assert_eq!(
      &format!("{:?}", stmt),
      r#"Let("test", Some(Binary(Constant(Number(5.2)), Multiply, Constant(Number(3.0)))))"#
    );

    let stmt = StmtParser::new()
      .parse("let test = 22.5 * if true {3} else {4};")
      .unwrap();
    assert_eq!(
      &format!("{:?}", stmt),
      r#"Let("test", Some(Binary(Constant(Number(22.5)), Multiply, If(Constant(True), Block([], Some(Constant(Number(3.0)))), Some(Block([], Some(Constant(Number(4.0)))))))))"#
    );

    let stmt = StmtParser::new().parse("let test;").unwrap();
    assert_eq!(&format!("{:?}", stmt), r#"Let("test", None)"#);
  }

  #[test]
  fn parse_return_stmt() {
    let stmt = StmtParser::new().parse(r#"return "howdy!";"#).unwrap();
    assert_eq!(
      &format!("{:?}", stmt),
      r#"Return(Some(Constant(String("\"howdy!\""))))"#
    );
  }

  #[test]
  fn parse_expression_stmt() {
    let stmt = StmtParser::new().parse("22.5 * (44 + 66);").unwrap();
    assert_eq!(
      &format!("{:?}", stmt),
      "Expression(Binary(Constant(Number(22.5)), Multiply, Binary(Constant(Number(44.0)), Add, Constant(Number(66.0)))))"
    );
  }

  #[test]
  fn parse_block_expr() {
    let expr = ExprParser::new().parse("{15 + 1; 3}").unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      "Block([Expression(Binary(Constant(Number(15.0)), Add, Constant(Number(1.0))))], Some(Constant(Number(3.0))))"
    );
  }

  #[test]
  fn parse_if_expr() {
    let expr = ExprParser::new()
      .parse(r#"if 3 == "3" {15 + 1; 3}"#)
      .unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      r#"If(Binary(Constant(Number(3.0)), Equal, Constant(String("\"3\""))), Block([Expression(Binary(Constant(Number(15.0)), Add, Constant(Number(1.0))))], Some(Constant(Number(3.0)))), None)"#
    );

    let expr = ExprParser::new().parse("if 3 {3} else if 6 {6}").unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      "If(Constant(Number(3.0)), Block([], Some(Constant(Number(3.0)))), Some(If(Constant(Number(6.0)), Block([], Some(Constant(Number(6.0)))), None)))"
    );
  }

  #[test]
  fn parse_while_expr() {
    let expr = ExprParser::new().parse("while true {15 + 1;}").unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      "While(Constant(True), [Expression(Binary(Constant(Number(15.0)), Add, Constant(Number(1.0))))])"
    );
  }

  #[test]
  fn parse_log_expr() {
    let expr = ExprParser::new().parse(r#"log(a = "arg")"#).unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      r#"Log(Assign(Constant(Ident("a")), Assign, Constant(String("\"arg\""))))"#
    );
  }

  #[test]
  fn parse_assign_expr() {
    let expr = ExprParser::new().parse("a = 5").unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      r#"Assign(Constant(Ident("a")), Assign, Constant(Number(5.0)))"#
    );
    let expr = ExprParser::new().parse("a *= b = 5").unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      r#"Assign(Constant(Ident("a")), MultiplyAssign, Assign(Constant(Ident("b")), Assign, Constant(Number(5.0))))"#
    );
  }

  #[test]
  fn parse_binary_expr() {
    let expr = ExprParser::new().parse("22.5 * -44 + 66").unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      "Binary(Binary(Constant(Number(22.5)), Multiply, Unary(Negate, Constant(Number(44.0)))), Add, Constant(Number(66.0)))"
    );
  }

  #[test]
  fn parse_call_expr() {
    let expr = ExprParser::new().parse("test(3 * 5, 4,)").unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      r#"Call(Constant(Ident("test")), [Binary(Constant(Number(3.0)), Multiply, Constant(Number(5.0))), Constant(Number(4.0))])"#
    );
  }

  #[test]
  fn parse_complex_tuples() {
    let expr = ExprParser::new()
      .parse(r#"#[1, 3, 5, #["test", "I hope this works!!"]]"#)
      .unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      r#"Constant(Tuple([Constant(Number(1.0)), Constant(Number(3.0)), Constant(Number(5.0)), Constant(Tuple([Constant(String("\"test\"")), Constant(String("\"I hope this works!!\""))]))]))"#
    );

    let expr = ExprParser::new()
      .parse(r#"#[1, 3, 5, #["test", "I hope this works!!"]][3][1]"#)
      .unwrap();
    assert_eq!(
      &format!("{:?}", expr),
      r#"Index(Index(Constant(Tuple([Constant(Number(1.0)), Constant(Number(3.0)), Constant(Number(5.0)), Constant(Tuple([Constant(String("\"test\"")), Constant(String("\"I hope this works!!\""))]))])), Constant(Number(3.0))), Constant(Number(1.0)))"#
    );
  }
}