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

//! String trait implementations.

use crate::reflection::{FromValue, ReflectValueType, ToValue, UnsafeFromValue};
use crate::value::{ValuePtr, ValueType, ValueTypeInfo};
use crate::vm::{Mut, RawMutGuard, RawRefGuard, Ref, Vm, VmError};

impl ReflectValueType for String {
    fn value_type() -> ValueType {
        ValueType::String
    }

    fn value_type_info() -> ValueTypeInfo {
        ValueTypeInfo::String
    }
}

impl<'a> ReflectValueType for &'a str {
    fn value_type() -> ValueType {
        ValueType::String
    }

    fn value_type_info() -> ValueTypeInfo {
        ValueTypeInfo::String
    }
}

impl ToValue for String {
    fn to_value(self, vm: &mut Vm) -> Result<ValuePtr, VmError> {
        Ok(vm.string_allocate(self))
    }
}

impl FromValue for String {
    fn from_value(value: ValuePtr, vm: &mut Vm) -> Result<Self, VmError> {
        let slot = value.into_string(vm)?;
        vm.string_take(slot)
    }
}

/// Convert a string into a value type.
impl ReflectValueType for Box<str> {
    fn value_type() -> ValueType {
        ValueType::String
    }

    fn value_type_info() -> ValueTypeInfo {
        ValueTypeInfo::String
    }
}

impl ToValue for Box<str> {
    fn to_value(self, vm: &mut Vm) -> Result<ValuePtr, VmError> {
        Ok(vm.string_allocate(self.to_string()))
    }
}

impl FromValue for Box<str> {
    fn from_value(value: ValuePtr, vm: &mut Vm) -> Result<Self, VmError> {
        let slot = value.into_string(vm)?;
        Ok(vm.string_take(slot)?.into_boxed_str())
    }
}

impl<'a> UnsafeFromValue for &'a str {
    type Output = *const str;
    type Guard = Option<RawRefGuard>;

    unsafe fn unsafe_from_value(
        value: ValuePtr,
        vm: &mut Vm,
    ) -> Result<(Self::Output, Self::Guard), VmError> {
        Ok(match value {
            ValuePtr::String(slot) => {
                let (s, guard) = Ref::unsafe_into_ref(vm.string_ref(slot)?);
                ((*s).as_str(), Some(guard))
            }
            ValuePtr::StaticString(slot) => {
                let s = vm.unit.lookup_string(slot)?;
                (s, None)
            }
            actual => {
                return Err(VmError::ExpectedString {
                    actual: actual.type_info(vm)?,
                })
            }
        })
    }

    unsafe fn to_arg(output: Self::Output) -> Self {
        &*output
    }
}

impl<'a> UnsafeFromValue for &'a String {
    type Output = *const String;
    type Guard = RawRefGuard;

    unsafe fn unsafe_from_value(
        value: ValuePtr,
        vm: &mut Vm,
    ) -> Result<(Self::Output, Self::Guard), VmError> {
        let slot = value.into_string(vm)?;
        Ok(Ref::unsafe_into_ref(vm.string_ref(slot)?))
    }

    unsafe fn to_arg(output: Self::Output) -> Self {
        &*output
    }
}

impl<'a> ReflectValueType for &'a String {
    fn value_type() -> ValueType {
        ValueType::String
    }

    fn value_type_info() -> ValueTypeInfo {
        ValueTypeInfo::String
    }
}

impl<'a> UnsafeFromValue for &'a mut String {
    type Output = *mut String;
    type Guard = RawMutGuard;

    unsafe fn unsafe_from_value(
        value: ValuePtr,
        vm: &mut Vm,
    ) -> Result<(Self::Output, Self::Guard), VmError> {
        let slot = value.into_string(vm)?;
        Ok(Mut::unsafe_into_mut(vm.string_mut(slot)?))
    }

    unsafe fn to_arg(output: Self::Output) -> Self {
        &mut *output
    }
}

impl<'a> ReflectValueType for &'a mut String {
    fn value_type() -> ValueType {
        ValueType::String
    }

    fn value_type_info() -> ValueTypeInfo {
        ValueTypeInfo::String
    }
}