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

use crate::errors::Error;
use core::fmt;
use strum_macros::EnumString;
use thiserror::Error as ThisError;

#[derive(Debug, Clone, EnumString, PartialEq, Eq)]
#[strum(ascii_case_insensitive)]
pub enum ParamType {
    U8,
    U16,
    U32,
    U64,
    Bool,
    Byte,
    B256,
    // The Unit paramtype is used for unit variants in Enums. The corresponding type field is `()`,
    // similar to Rust.
    Unit,
    Array(Box<ParamType>, usize),
    #[strum(serialize = "str")]
    String(usize),
    #[strum(disabled)]
    Struct(Vec<ParamType>),
    #[strum(disabled)]
    Enum(EnumVariants),
    Tuple(Vec<ParamType>),
}

impl Default for ParamType {
    fn default() -> Self {
        ParamType::U8
    }
}

pub enum ReturnLocation {
    Return,
    ReturnData,
}

impl ParamType {
    // Depending on the type, the returned value will be stored
    // either in `Return` or `ReturnData`. For more information,
    // see https://github.com/FuelLabs/sway/issues/1368.
    pub fn get_return_location(&self) -> ReturnLocation {
        match &*self {
            Self::Unit | Self::U8 | Self::U16 | Self::U32 | Self::U64 | Self::Bool => {
                ReturnLocation::Return
            }

            _ => ReturnLocation::ReturnData,
        }
    }
}

impl fmt::Display for ParamType {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            ParamType::String(size) => {
                let t = format!("String({})", size);
                write!(f, "{}", t)
            }
            ParamType::Array(t, size) => {
                let boxed_type_str = format!("Box::new(ParamType::{})", t);
                let arr_str = format!("Array({},{})", boxed_type_str, size);
                write!(f, "{}", arr_str)
            }
            ParamType::Struct(inner) => {
                let inner_strings: Vec<String> =
                    inner.iter().map(|p| format!("ParamType::{}", p)).collect();

                let s = format!("Struct(vec![{}])", inner_strings.join(","));
                write!(f, "{}", s)
            }
            ParamType::Enum(variants) => {
                let inner_strings: Vec<String> = variants
                    .param_types()
                    .iter()
                    .map(|p| format!("ParamType::{}", p))
                    .collect();

                let s = format!(
                    "Enum(EnumVariants::new(vec![{}]).unwrap())",
                    inner_strings.join(",")
                );
                write!(f, "{}", s)
            }
            ParamType::Tuple(inner) => {
                let inner_strings: Vec<String> =
                    inner.iter().map(|p| format!("ParamType::{}", p)).collect();

                let s = format!("Tuple(vec![{}])", inner_strings.join(","));
                write!(f, "{}", s)
            }
            ParamType::Unit => write! {f, "Unit"},
            _ => {
                write!(f, "{:?}", self)
            }
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EnumVariants {
    variants: Vec<ParamType>,
}

#[derive(ThisError, Debug)]
pub struct NoVariants;

impl fmt::Display for NoVariants {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "An Enum must have variants!")
    }
}

impl From<NoVariants> for Error {
    fn from(err: NoVariants) -> Self {
        Error::InvalidType(format!("{}", err))
    }
}

impl EnumVariants {
    pub fn new(variants: Vec<ParamType>) -> Result<EnumVariants, NoVariants> {
        if !variants.is_empty() {
            Ok(EnumVariants { variants })
        } else {
            Err(NoVariants)
        }
    }

    pub fn param_types(&self) -> &Vec<ParamType> {
        &self.variants
    }

    pub fn only_units_inside(&self) -> bool {
        self.variants
            .iter()
            .all(|variant| *variant == ParamType::Unit)
    }
}