mist-parser 0.1.1

The Mist programming language parser
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

use crate::{
    Rule,
    ast::*,
    ast_expr,
    error::{AstError, AstResult, IntoErr},
    parser::listen_rule,
};

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for VarDeclStmt {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        match pair.as_rule() {
            Rule::var_decl_statement => {
                let mut inner = pair.into_inner();

                ast_expr!(VarDeclStmt {
                    decl: inner.next().unwrap().try_into(),
                    init: inner.next().map(Expression::try_from).transpose()
                })
            }

            _ => AstError::bug_unimplemented(pair),
        }
    }
}

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FieldDeclStmt {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        match pair.as_rule() {
            Rule::class_field => {
                let mut inner = pair.into_inner();

                ast_expr!(FieldDeclStmt {
                    decl: inner.next().unwrap().try_into(),
                    init: inner.next().map(Expression::try_from).transpose(),
                })
            }

            _ => AstError::bug_unimplemented(pair),
        }
    }
}

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for VarDecl {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        match pair.as_rule() {
            Rule::var_decl => {
                let mut inner = pair.into_inner();

                let type_ = inner
                    .next()
                    .and_then(|pair| {
                        if pair.as_str().trim() == "var" {
                            None
                        } else {
                            Some(TypeExpr::try_from(pair))
                        }
                    })
                    .transpose();

                let mutable: AstResult<'_, bool> = Ok(listen_rule(&mut inner, Rule::mutable));

                let name = Pattern::try_from(inner.next().unwrap());

                ast_expr!(VarDecl {
                    type_: type_,
                    mutable: mutable,
                    name: name,
                })
            }

            _ => AstError::bug_unimplemented(pair),
        }
    }
}

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FieldDecl {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        match pair.as_rule() {
            Rule::field => {
                let mut inner = pair.into_inner();

                ast_expr!(FieldDecl {
                    visibility: Visibility::try_from(&mut inner),
                    type_: TypeExpr::try_from(inner.next().unwrap()),
                    name: Identifier::try_from(inner.next().unwrap()),
                })
            }

            _ => AstError::bug_unimplemented(pair),
        }
    }
}