rustleaf 0.1.0

A simple programming language interpreter written in Rust
Documentation 
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

# Program
Status: 🟢
Assertions: 1

```rustleaf
var empty = [];
assert(empty == []);
```

# Output
```
parse_program: starting
parse_program: parsing statement at position 0 (Var)
parse_statement: starting at position 0 (Var)
consume_token: position 0 consumed Var
consume_token: position 1 consumed Ident
consume_token: position 2 consumed Equal
parse_expression: starting at position 3 (LeftBracket)
consume_token: position 3 consumed LeftBracket
parse_primary: success - parsing list literal
parse_list_literal: starting at position 4
consume_token: position 4 consumed RightBracket
parse_list_literal: empty list
parse_expression: success - parsed precedence expression
consume_token: position 5 consumed Semicolon
parse_statement: success - parsed var declaration
parse_program: parsing statement at position 6 (Ident(assert))
parse_statement: starting at position 6 (Ident(assert))
consume_token: position 6 consumed Ident
parse_statement: falling back to expression statement
parse_expression: starting at position 6 (Ident(assert))
consume_token: position 6 consumed Ident
parse_primary: success - parsed identifier (assert)
consume_token: position 7 consumed LeftParen
parse_expression: starting at position 8 (Ident(empty))
consume_token: position 8 consumed Ident
parse_primary: success - parsed identifier (empty)
consume_token: position 9 consumed EqualEqual
consume_token: position 10 consumed LeftBracket
parse_primary: success - parsing list literal
parse_list_literal: starting at position 11
consume_token: position 11 consumed RightBracket
parse_list_literal: empty list
parse_expression: success - parsed precedence expression
consume_token: position 12 consumed RightParen
parse_expression: success - parsed precedence expression
consume_token: position 13 consumed Semicolon
parse_program: parsed 2 statements
```

# Result
```rust
Ok(
    Unit,
)
```

# Lex
```rust
Ok(
    [
        0: Token(Var),
        1: Token(Ident, "empty"),
        2: Token(Equal),
        3: Token(LeftBracket),
        4: Token(RightBracket),
        5: Token(Semicolon),
        6: Token(Ident, "assert"),
        7: Token(LeftParen),
        8: Token(Ident, "empty"),
        9: Token(EqualEqual),
        10: Token(LeftBracket),
        11: Token(RightBracket),
        12: Token(RightParen),
        13: Token(Semicolon),
        14: Token(Eof)
    ],
)
```

# Parse
```rust
Ok(
    Program(
        [
            VarDecl {
                pattern: Variable(
                    "empty",
                ),
                value: Some(
                    List(
                        [],
                    ),
                ),
            },
            Expression(
                FunctionCall(
                    Identifier(
                        "assert",
                    ),
                    [
                        Eq(
                            Identifier(
                                "empty",
                            ),
                            List(
                                [],
                            ),
                        ),
                    ],
                ),
            ),
        ],
    ),
)
```

# Eval
```rust
Ok(
    RustValue(<unknown>),
)
```