lune_std/
global.rs

1use std::str::FromStr;
2
3use mlua::prelude::*;
4
5/**
6    A standard global provided by Lune.
7*/
8#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
9pub enum LuneStandardGlobal {
10    GTable,
11    Print,
12    Require,
13    Version,
14    Warn,
15}
16
17impl LuneStandardGlobal {
18    /**
19        All available standard globals.
20    */
21    pub const ALL: &'static [Self] = &[
22        Self::GTable,
23        Self::Print,
24        Self::Require,
25        Self::Version,
26        Self::Warn,
27    ];
28
29    /**
30        Gets the name of the global, such as `_G` or `require`.
31    */
32    #[must_use]
33    pub fn name(&self) -> &'static str {
34        match self {
35            Self::GTable => "_G",
36            Self::Print => "print",
37            Self::Require => "require",
38            Self::Version => "_VERSION",
39            Self::Warn => "warn",
40        }
41    }
42
43    /**
44        Creates the Lua value for the global.
45
46        # Errors
47
48        If the global could not be created.
49    */
50    #[rustfmt::skip]
51    #[allow(unreachable_patterns)]
52    pub fn create(&self, lua: Lua) -> LuaResult<LuaValue> {
53        let res = match self {
54            Self::GTable => crate::globals::g_table::create(lua),
55            Self::Print => crate::globals::print::create(lua),
56            Self::Require => crate::globals::require::create(lua),
57            Self::Version => crate::globals::version::create(lua),
58            Self::Warn => crate::globals::warn::create(lua),
59        };
60        match res {
61            Ok(v) => Ok(v),
62            Err(e) => Err(e.context(format!(
63                "Failed to create standard global '{}'",
64                self.name()
65            ))),
66        }
67    }
68}
69
70impl FromStr for LuneStandardGlobal {
71    type Err = String;
72    fn from_str(s: &str) -> Result<Self, Self::Err> {
73        let low = s.trim().to_ascii_lowercase();
74        Ok(match low.as_str() {
75            "_g" => Self::GTable,
76            "print" => Self::Print,
77            "require" => Self::Require,
78            "_version" => Self::Version,
79            "warn" => Self::Warn,
80            _ => {
81                return Err(format!(
82                    "Unknown standard global '{low}'\nValid globals are: {}",
83                    Self::ALL
84                        .iter()
85                        .map(Self::name)
86                        .collect::<Vec<_>>()
87                        .join(", ")
88                ));
89            }
90        })
91    }
92}
lune_std/global.rs

lune_std/
global.rs
