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author | Nadrieril | 2019-05-07 16:28:39 +0200 |
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committer | Nadrieril | 2019-05-07 16:28:39 +0200 |
commit | 14dfeb8e7d2aa87a361a711a485243449426b144 (patch) | |
tree | 02e00cd008d2e7dc899b9211379596fe792f41c8 /dhall_syntax/src/core/label.rs | |
parent | 1a97f8957539e9192bdb9176a8eafd4da101a857 (diff) |
Reorganize dhall_syntax
Diffstat (limited to 'dhall_syntax/src/core/label.rs')
-rw-r--r-- | dhall_syntax/src/core/label.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/dhall_syntax/src/core/label.rs b/dhall_syntax/src/core/label.rs new file mode 100644 index 0000000..43c3f53 --- /dev/null +++ b/dhall_syntax/src/core/label.rs @@ -0,0 +1,34 @@ +use std::rc::Rc; + +// The type for labels throughout the AST +// It owns the data because otherwise lifetimes would make recursive imports impossible +#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)] +pub struct Label(Rc<str>); + +impl From<String> for Label { + fn from(s: String) -> Self { + let s: &str = &s; + Label(s.into()) + } +} + +impl<'a> From<&'a str> for Label { + fn from(s: &'a str) -> Self { + Label(Rc::from(s)) + } +} + +impl From<&Label> for String { + fn from(x: &Label) -> String { + x.0.as_ref().to_owned() + } +} + +impl Label { + pub fn from_str(s: &str) -> Label { + Label(s.into()) + } + pub fn as_ref(&self) -> &str { + self.0.as_ref() + } +} |