pub struct MacroEnv { /* private fields */ }Expand description
The macros a compilation may use, and what an unregistered one does.
crate::Engine holds one of these and fills it through
crate::Engine::register_macro. A tool that compiles without the
embedder’s expanders builds one directly, turns MacroEnv::allow_unknown
on, and compiles inside MacroEnv::scope.
Implementations§
Source§impl MacroEnv
impl MacroEnv
pub fn new() -> Self
Sourcepub fn register<F>(&mut self, name: &str, expander: F)
pub fn register<F>(&mut self, name: &str, expander: F)
Registers expander as the meaning of name!( ... ).
The expander receives the raw region body and returns candela source for
one expression, or a MacroError that becomes a compile error at the
macro site. Registering a name twice keeps the last expander.
Sourcepub const fn allow_unknown(&mut self, allow: bool)
pub const fn allow_unknown(&mut self, allow: bool)
Sets what an unregistered macro does: a compile error naming it (the
default), or, when allow is true, a null expression.
Permitting unknown macros is for tooling that reads source it cannot expand, such as the language server, which has no access to the host’s expanders and must not report the host’s macros as errors.
pub fn is_registered(&self, name: &str) -> bool
Sourcepub fn scope<R>(&self, f: impl FnOnce() -> R) -> R
pub fn scope<R>(&self, f: impl FnOnce() -> R) -> R
Runs f with this environment active, and returns what it returns.
Anything compiled inside f expands its macros through this
environment, including the files it imports. The previous environment is
restored afterwards, including when f unwinds.
Trait Implementations§
Auto Trait Implementations§
impl !RefUnwindSafe for MacroEnv
impl !Send for MacroEnv
impl !Sync for MacroEnv
impl !UnwindSafe for MacroEnv
impl Freeze for MacroEnv
impl Unpin for MacroEnv
impl UnsafeUnpin for MacroEnv
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