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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179

use crate::{Any, AnyObj, Panic, Shared, Value, VmError, VmErrorKind};

/// Trait for converting types into values.
pub trait ToValue: Sized {
    /// Convert into a value.
    fn to_value(self) -> Result<Value, VmError>;
}

/// Trait for converting types into values.
pub trait UnsafeToValue: Sized {
    /// The type used to guard the unsafe value conversion.
    type Guard: 'static;

    /// Convert into a value.
    ///
    /// # Safety
    ///
    /// The value returned must not be used after the guard associated with it
    /// has been dropped.
    unsafe fn unsafe_to_value(self) -> Result<(Value, Self::Guard), VmError>;
}

impl<T> ToValue for T
where
    T: Any,
{
    fn to_value(self) -> Result<Value, VmError> {
        Ok(Value::from(AnyObj::new(self)))
    }
}

impl<T> UnsafeToValue for T
where
    T: ToValue,
{
    type Guard = ();

    unsafe fn unsafe_to_value(self) -> Result<(Value, Self::Guard), VmError> {
        Ok((self.to_value()?, ()))
    }
}

impl ToValue for &Value {
    fn to_value(self) -> Result<Value, VmError> {
        Ok(self.clone())
    }
}

// Option impls

impl<T> ToValue for Option<T>
where
    T: ToValue,
{
    fn to_value(self) -> Result<Value, VmError> {
        Ok(Value::from(Shared::new(match self {
            Some(some) => {
                let value = some.to_value()?;
                Some(value)
            }
            None => None,
        })))
    }
}

// String impls

impl ToValue for Box<str> {
    fn to_value(self) -> Result<Value, VmError> {
        Ok(Value::from(Shared::new(self.to_string())))
    }
}

// Result impls

impl<T> ToValue for Result<T, Panic>
where
    T: ToValue,
{
    fn to_value(self) -> Result<Value, VmError> {
        match self {
            Ok(value) => Ok(value.to_value()?),
            Err(reason) => Err(VmError::from(VmErrorKind::Panic { reason })),
        }
    }
}

impl<T> ToValue for Result<T, VmError>
where
    T: ToValue,
{
    fn to_value(self) -> Result<Value, VmError> {
        match self {
            Ok(value) => Ok(value.to_value()?),
            Err(error) => Err(error),
        }
    }
}

impl<T, E> ToValue for Result<T, E>
where
    T: ToValue,
    E: ToValue,
{
    fn to_value(self) -> Result<Value, VmError> {
        Ok(match self {
            Ok(ok) => {
                let ok = ok.to_value()?;
                Value::from(Shared::new(Ok(ok)))
            }
            Err(err) => {
                let err = err.to_value()?;
                Value::from(Shared::new(Err(err)))
            }
        })
    }
}

// number impls

macro_rules! number_value_trait {
    ($ty:ty) => {
        impl ToValue for $ty {
            fn to_value(self) -> Result<Value, $crate::VmError> {
                use std::convert::TryInto as _;

                match self.try_into() {
                    Ok(number) => Ok(Value::Integer(number)),
                    Err(..) => Err($crate::VmError::from(
                        $crate::VmErrorKind::IntegerToValueCoercionError {
                            from: $crate::VmIntegerRepr::from(self),
                            to: std::any::type_name::<i64>(),
                        },
                    )),
                }
            }
        }
    };
}

number_value_trait!(u16);
number_value_trait!(u32);
number_value_trait!(u64);
number_value_trait!(u128);
number_value_trait!(usize);
number_value_trait!(i8);
number_value_trait!(i16);
number_value_trait!(i32);
number_value_trait!(i128);
number_value_trait!(isize);

impl ToValue for f32 {
    fn to_value(self) -> Result<Value, VmError> {
        Ok(Value::Float(self as f64))
    }
}

// map impls

macro_rules! impl_map {
    ($ty:ty) => {
        impl<T> $crate::ToValue for $ty
        where
            T: $crate::ToValue,
        {
            fn to_value(self) -> Result<$crate::Value, $crate::VmError> {
                let mut output = crate::Object::with_capacity(self.len());

                for (key, value) in self {
                    output.insert(key, value.to_value()?);
                }

                Ok($crate::Value::from($crate::Shared::new(output)))
            }
        }
    };
}

impl_map!(std::collections::HashMap<String, T>);