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

use crate::{Error, Result, RootType, TupleSpecifier};
use winnow::{trace::trace, PResult, Parser};

/// A stem of a Solidity array type. It is either a root type, or a tuple type.
///
/// # Examples
///
/// ```
/// # use alloy_sol_type_parser::{TypeStem, RootType, TupleSpecifier};
/// let stem = TypeStem::parse("uint256")?;
/// assert_eq!(stem.span(), "uint256");
/// assert!(matches!(stem, TypeStem::Root(_)));
/// assert_eq!(stem.as_root(), Some(&RootType::parse("uint256").unwrap()));
///
/// let stem = TypeStem::parse("(uint256,bool)")?;
/// assert_eq!(stem.span(), "(uint256,bool)");
/// assert!(matches!(stem, TypeStem::Tuple(_)));
/// assert_eq!(
///     stem.as_tuple(),
///     Some(&TupleSpecifier::parse("(uint256,bool)").unwrap())
/// );
/// # Ok::<_, alloy_sol_type_parser::Error>(())
/// ```
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TypeStem<'a> {
    /// Root type.
    Root(RootType<'a>),
    /// Tuple type.
    Tuple(TupleSpecifier<'a>),
}

impl<'a> TryFrom<&'a str> for TypeStem<'a> {
    type Error = Error;

    #[inline]
    fn try_from(value: &'a str) -> Result<Self> {
        Self::parse(value)
    }
}

impl AsRef<str> for TypeStem<'_> {
    #[inline]
    fn as_ref(&self) -> &str {
        self.span()
    }
}

impl<'a> TypeStem<'a> {
    /// Parse a type stem from a string.
    #[inline]
    pub fn parse(input: &'a str) -> Result<Self> {
        if input.starts_with('(') || input.starts_with("tuple(") {
            input.try_into().map(Self::Tuple)
        } else {
            input.try_into().map(Self::Root)
        }
    }

    pub(crate) fn parser(input: &mut &'a str) -> PResult<Self> {
        let name = "TypeStem";
        if input.starts_with('(') || input.starts_with("tuple(") {
            trace(name, TupleSpecifier::parser)
                .parse_next(input)
                .map(Self::Tuple)
        } else {
            trace(name, RootType::parser)
                .parse_next(input)
                .map(Self::Root)
        }
    }

    /// Fallible conversion to a root type
    #[inline]
    pub const fn as_root(&self) -> Option<&RootType<'a>> {
        match self {
            Self::Root(root) => Some(root),
            Self::Tuple(_) => None,
        }
    }

    /// Fallible conversion to a tuple type
    #[inline]
    pub const fn as_tuple(&self) -> Option<&TupleSpecifier<'a>> {
        match self {
            Self::Root(_) => None,
            Self::Tuple(tuple) => Some(tuple),
        }
    }

    /// Returns the type stem as a string.
    #[inline]
    pub const fn span(&self) -> &'a str {
        match self {
            Self::Root(root) => root.span(),
            Self::Tuple(tuple) => tuple.span(),
        }
    }

    /// Returns true if the type is a basic Solidity type.
    #[inline]
    pub fn try_basic_solidity(&self) -> Result<()> {
        match self {
            Self::Root(root) => root.try_basic_solidity(),
            Self::Tuple(tuple) => tuple.try_basic_solidity(),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn tuple() {
        // empty tuple
        assert_eq!(
            TypeStem::parse("()"),
            Ok(TypeStem::Tuple(TupleSpecifier {
                span: "()",
                types: vec![]
            }))
        );
        TypeStem::parse("tuple(").unwrap_err();
        assert_eq!(
            TypeStem::parse("tuple()"),
            Ok(TypeStem::Tuple(TupleSpecifier {
                span: "tuple()",
                types: vec![]
            }))
        );

        // type named tuple
        assert_eq!(
            TypeStem::parse("tuple"),
            Ok(TypeStem::Root(RootType::parse("tuple").unwrap()))
        )
    }
}