luau 0.732.0

Safe lifetime-bound Rust embedding API for the Luau runtime
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237

use luau_common::{BStr, BString};
use luau_vm::thread::{StackGuard, Thread as VmThread};

use super::LuaString;
use crate::error::Error;
use crate::thread::Thread;
use crate::value::{FromLua, IntoLua, LuaType, Value};

struct WrappedString<T>(T);

impl LuaString<'_> {
    /// Wraps bytes so they can be converted into a Luau string.
    pub fn wrap<T>(data: T) -> impl for<'value> IntoLua<'value>
    where
        T: AsRef<[u8]>,
    {
        WrappedString(data)
    }
}

impl LuaType for LuaString<'_> {
    fn push_type_key(thread: impl AsRef<VmThread>) -> Result<(), Error> {
        let thread = thread.as_ref();
        unsafe {
            thread
                .push_string("")
                .map_err(|exit| Error::from_thread_exit(thread, exit))
        }
    }
}

impl<'lua> IntoLua<'lua> for &str {
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        LuaString::from_bytes(&thread.current_thread(), self).map(Value::String)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe {
            thread
                .as_vm()
                .push_string(self)
                .map_err(|exit| Error::from_thread_exit(thread, exit))?;
        }
        Ok(())
    }
}

impl<'lua> IntoLua<'lua> for String {
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        LuaString::from_bytes(&thread.current_thread(), self).map(Value::String)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe {
            thread
                .as_vm()
                .push_string(self)
                .map_err(|exit| Error::from_thread_exit(thread, exit))?;
        }
        Ok(())
    }
}

impl<'lua> IntoLua<'lua> for &String {
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        self.as_str().into_lua(thread)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe { self.as_str().push_into_stack(thread) }
    }
}

impl<'lua> IntoLua<'lua> for &[u8] {
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        LuaString::from_bytes(&thread.current_thread(), self).map(Value::String)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe {
            thread
                .as_vm()
                .push_string(self)
                .map_err(|exit| Error::from_thread_exit(thread, exit))?;
        }
        Ok(())
    }
}

impl<'lua> IntoLua<'lua> for &BStr {
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        LuaString::from_bytes(&thread.current_thread(), self).map(Value::String)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe {
            thread
                .as_vm()
                .push_string(self)
                .map_err(|exit| Error::from_thread_exit(thread, exit))?;
        }
        Ok(())
    }
}

impl<'lua> IntoLua<'lua> for BString {
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        LuaString::from_bytes(&thread.current_thread(), &self).map(Value::String)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe {
            thread
                .as_vm()
                .push_string(self)
                .map_err(|exit| Error::from_thread_exit(thread, exit))?;
        }
        Ok(())
    }
}

impl<'lua> IntoLua<'lua> for &BString {
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        LuaString::from_bytes(&thread.current_thread(), self).map(Value::String)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe {
            thread
                .as_vm()
                .push_string(self)
                .map_err(|exit| Error::from_thread_exit(thread, exit))?;
        }
        Ok(())
    }
}

impl<'lua, 'string> IntoLua<'lua> for LuaString<'string>
where
    'string: 'lua,
{
    fn into_lua(self, _: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        Ok(Value::String(self))
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        self.push_to(thread)
    }
}

impl<'lua, 'string> IntoLua<'lua> for &LuaString<'string>
where
    'string: 'lua,
{
    fn into_lua(self, _: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        Ok(Value::String(self.try_clone()?))
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        self.push_to(thread)
    }
}

impl<'lua> FromLua<'lua> for LuaString<'lua> {
    fn from_lua(value: Value<'lua>, lua: crate::LuaRef<'lua>) -> Result<Self, Error> {
        match value {
            Value::String(value) => Ok(value),
            value => {
                let thread = lua.current_thread();
                let vm_thread = thread.as_vm();
                unsafe {
                    let _stack = StackGuard::new(vm_thread);
                    value.push_to(&thread)?;
                    LuaString::coerce_from_stack(&thread, -1)
                }
            }
        }
    }

    unsafe fn from_stack(thread: &Thread<'lua>, index: i32) -> Result<Self, Error> {
        LuaString::coerce_from_stack(thread, index)
    }
}

impl<'lua> FromLua<'lua> for BString {
    fn from_lua(value: Value<'lua>, lua: crate::LuaRef<'lua>) -> Result<Self, Error> {
        match value {
            Value::String(value) => Ok(value.as_bytes().to_owned()),
            Value::Buffer(value) => Ok(value.to_vec().into()),
            value => LuaString::from_lua(value, lua).map(|value| value.as_bytes().to_owned()),
        }
    }

    unsafe fn from_stack(thread: &Thread<'lua>, index: i32) -> Result<Self, Error> {
        if let Some((data, len)) = unsafe { thread.as_vm().to_buffer(index) } {
            if len == 0 {
                return Ok(BString::default());
            }
            let bytes = unsafe { core::slice::from_raw_parts(data.cast_const(), len) };
            return Ok(bytes.into());
        }

        let value = LuaString::coerce_from_stack(thread, index)?;
        Ok(value.as_bytes().to_owned())
    }
}

impl<'lua> FromLua<'lua> for String {
    fn from_lua(value: Value<'lua>, lua: crate::LuaRef<'lua>) -> Result<Self, Error> {
        let value = LuaString::from_lua(value, lua)?;
        value.to_str().map(str::to_owned)
    }

    unsafe fn from_stack(thread: &Thread<'lua>, index: i32) -> Result<Self, Error> {
        let value = LuaString::coerce_from_stack(thread, index)?;
        value.to_str().map(str::to_owned)
    }
}

impl<'lua, T> IntoLua<'lua> for WrappedString<T>
where
    T: AsRef<[u8]>,
{
    fn into_lua(self, thread: crate::LuaRef<'lua>) -> Result<Value<'lua>, Error> {
        LuaString::from_bytes(&thread.current_thread(), self.0).map(Value::String)
    }

    unsafe fn push_into_stack(self, thread: &Thread<'lua>) -> Result<(), Error> {
        unsafe {
            thread
                .as_vm()
                .push_string(self.0)
                .map_err(|exit| Error::from_thread_exit(thread, exit))?;
        }
        Ok(())
    }
}