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use rustc::lint::{EarlyLintPassObject, LateLintPassObject, LintId, Lint};
use rustc::session::Session;
use syntax::ext::base::{SyntaxExtension, NamedSyntaxExtension, NormalTT, IdentTT};
use syntax::ext::base::MacroExpanderFn;
use syntax::symbol::Symbol;
use syntax::ast;
use syntax::feature_gate::AttributeType;
use syntax_pos::Span;
use std::collections::HashMap;
use std::borrow::ToOwned;
pub struct Registry<'a> {
pub sess: &'a Session,
#[doc(hidden)]
pub args_hidden: Option<Vec<ast::NestedMetaItem>>,
#[doc(hidden)]
pub krate_span: Span,
#[doc(hidden)]
pub syntax_exts: Vec<NamedSyntaxExtension>,
#[doc(hidden)]
pub early_lint_passes: Vec<EarlyLintPassObject>,
#[doc(hidden)]
pub late_lint_passes: Vec<LateLintPassObject>,
#[doc(hidden)]
pub lint_groups: HashMap<&'static str, Vec<LintId>>,
#[doc(hidden)]
pub llvm_passes: Vec<String>,
#[doc(hidden)]
pub attributes: Vec<(String, AttributeType)>,
whitelisted_custom_derives: Vec<ast::Name>,
}
impl<'a> Registry<'a> {
#[doc(hidden)]
pub fn new(sess: &'a Session, krate_span: Span) -> Registry<'a> {
Registry {
sess: sess,
args_hidden: None,
krate_span: krate_span,
syntax_exts: vec![],
early_lint_passes: vec![],
late_lint_passes: vec![],
lint_groups: HashMap::new(),
llvm_passes: vec![],
attributes: vec![],
whitelisted_custom_derives: Vec::new(),
}
}
pub fn args<'b>(&'b self) -> &'b [ast::NestedMetaItem] {
self.args_hidden.as_ref().map(|v| &v[..]).unwrap_or(&[])
}
pub fn register_syntax_extension(&mut self, name: ast::Name, extension: SyntaxExtension) {
if name == "macro_rules" {
panic!("user-defined macros may not be named `macro_rules`");
}
self.syntax_exts.push((name, match extension {
NormalTT(ext, _, allow_internal_unstable) => {
NormalTT(ext, Some(self.krate_span), allow_internal_unstable)
}
IdentTT(ext, _, allow_internal_unstable) => {
IdentTT(ext, Some(self.krate_span), allow_internal_unstable)
}
_ => extension,
}));
}
#[unstable(feature = "rustc_private", issue = "27812")]
#[rustc_deprecated(since = "1.15.0", reason = "replaced by macros 1.1 (RFC 1861)")]
pub fn register_custom_derive(&mut self, name: ast::Name, extension: SyntaxExtension) {
assert!(name.as_str().starts_with("derive_"));
self.whitelisted_custom_derives.push(name);
self.register_syntax_extension(name, extension);
}
pub fn take_whitelisted_custom_derives(&mut self) -> Vec<ast::Name> {
::std::mem::replace(&mut self.whitelisted_custom_derives, Vec::new())
}
pub fn register_macro(&mut self, name: &str, expander: MacroExpanderFn) {
self.register_syntax_extension(Symbol::intern(name),
NormalTT(Box::new(expander), None, false));
}
pub fn register_early_lint_pass(&mut self, lint_pass: EarlyLintPassObject) {
self.early_lint_passes.push(lint_pass);
}
pub fn register_late_lint_pass(&mut self, lint_pass: LateLintPassObject) {
self.late_lint_passes.push(lint_pass);
}
pub fn register_lint_group(&mut self, name: &'static str, to: Vec<&'static Lint>) {
self.lint_groups.insert(name, to.into_iter().map(|x| LintId::of(x)).collect());
}
pub fn register_llvm_pass(&mut self, name: &str) {
self.llvm_passes.push(name.to_owned());
}
pub fn register_attribute(&mut self, name: String, ty: AttributeType) {
self.attributes.push((name, ty));
}
}