mist-parser 0.2.0-alpha.0

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
101
102
103
104

pub mod decl;
pub mod expr;
pub mod statement;
pub mod types;

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

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

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        ast_ensure!(pair, Rule::identifier => {
            Ok(Identifier(pair.as_str().to_string()))
        })
    }
}

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

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        match pair.as_rule() {
            Rule::static_path => Ok(Path(collect_recovered(pair.into_inner()).get()?)),
            _ => AstError::bug_unimplemented(pair),
        }
    }
}

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

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

        Ok(match rule {
            Rule::primary => Self::try_from(inner.next().unwrap())?,
            Rule::literal => Self::try_from(inner.next().unwrap())?,
            Rule::integer => Literal::Int(pair.as_str().parse::<i64>().unwrap()),
            Rule::float => Literal::Float(pair.as_str().parse::<f64>().unwrap()),
            Rule::boolean => Literal::Bool(pair.as_str().parse::<bool>().unwrap()),
            Rule::string_lit => Literal::String(inner.as_str().to_string()),
            Rule::tuple => Literal::Tuple(collect_recovered(inner).get()?),
            _ => return AstError::bug_unimplemented(pair),
        })
    }
}

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

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

        match rule {
            Rule::tuple_pattern => ast_expr!(Pattern::Tuple(collect_recovered_map(inner, |v| {
                Self::try_from(v).map(Box::new)
            }))),

            Rule::named_tuple_pattern => ast_expr!(Pattern::NamedTuple(
                Path::try_from(inner.next().unwrap()),
                collect_recovered_map(inner, |v| Self::try_from(v).map(Box::new)),
            )),

            Rule::struct_pattern => ast_expr!(Pattern::Struct(
                Path::try_from(inner.next().unwrap()),
                collect_recovered_map(inner, |v| Self::try_from(v).map(Box::new)),
            )),

            Rule::literal => ast_expr!(Pattern::Literal(pair.try_into())),

            Rule::path_pattern => ast_expr!(Pattern::Path(
                Ok(listen_rule(&mut inner, Rule::mutable)) as AstResult<'_, bool>,
                inner.next().unwrap().try_into()
            )),

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

impl<'a> TryFrom<&mut pest::iterators::Pairs<'a, Rule>> for Visibility {
    type Error = AstError<'a, Self>;

    fn try_from(pairs: &mut pest::iterators::Pairs<'a, Rule>) -> Result<Self, Self::Error> {
        Ok(consume_rule(pairs, Rule::visibility)
            .map(|pair| -> Result<Visibility, AstError<'a, Self>> {
                if let Some(path) = pair.into_inner().next() {
                    ast_expr!(Visibility::PublicTarget(Path::try_from(path)))
                } else {
                    Ok(Visibility::Public)
                }
            })
            .transpose()?
            .unwrap_or_else(|| Visibility::Private))
    }
}