rust-lang/rust
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Replace LetSyntaxTT with MacroRulesTT

Browse Source 
The implementation of LetSyntaxTT was specialized to macro_rules! in various
ways. This gets rid of the false generality and simplifies the code.
This commit is contained in:
Keegan McAllister
2014-09-15 16:09:09 -07:00
parent d1cf1b1e6b
commit 5e5924b799
7 changed files with 92 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/libsyntax/ext/base.rs
View File

@@ -328,13 +328,8 @@ pub enum SyntaxExtension {
///
IdentTT(Box<IdentMacroExpander + 'static>, Option<Span>),
/// An ident macro that has two properties:
/// - it adds a macro definition to the environment, and
/// - the definition it adds doesn't introduce any new
/// identifiers.
///
/// `macro_rules!` is a LetSyntaxTT
LetSyntaxTT(Box<IdentMacroExpander + 'static>, Option<Span>),
/// Represents `macro_rules!` itself.
MacroRulesTT,
}
pub type NamedSyntaxExtension = (Name, SyntaxExtension);
@@ -364,8 +359,7 @@ fn initial_syntax_expander_table(ecfg: &expand::ExpansionConfig) -> SyntaxEnv {
}
let mut syntax_expanders = SyntaxEnv::new();
syntax_expanders.insert(intern("macro_rules"),
LetSyntaxTT(box ext::tt::macro_rules::add_new_extension, None));
syntax_expanders.insert(intern("macro_rules"), MacroRulesTT);
syntax_expanders.insert(intern("fmt"),
builtin_normal_expander(
ext::fmt::expand_syntax_ext));