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rustc_expand: Factor out Annotatable::into_tokens to a separate method #69680

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Merged
merged 1 commit into from
Mar 7, 2020
Merged

rustc_expand: Factor out Annotatable::into_tokens to a separate method #69680

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27 changes: 26 additions & 1 deletion src/librustc_expand/base.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ use rustc_ast::ast::{self, Attribute, Name, NodeId, PatKind};
use rustc_ast::mut_visit::{self, MutVisitor};
use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::{self, TokenStream};
use rustc_ast::tokenstream::{self, TokenStream, TokenTree};
use rustc_ast::visit::{AssocCtxt, Visitor};
use rustc_attr::{self as attr, Deprecation, HasAttrs, Stability};
use rustc_data_structures::fx::FxHashMap;
Expand Down Expand Up @@ -118,6 +118,31 @@ impl Annotatable {
}
}

crate fn into_tokens(self) -> TokenStream {
// `Annotatable` can be converted into tokens directly, but we
// are packing it into a nonterminal as a piece of AST to make
// the produced token stream look nicer in pretty-printed form.
let nt = match self {
Annotatable::Item(item) => token::NtItem(item),
Annotatable::TraitItem(item) | Annotatable::ImplItem(item) => {
token::NtItem(P(item.and_then(ast::AssocItem::into_item)))
}
Annotatable::ForeignItem(item) => {
token::NtItem(P(item.and_then(ast::ForeignItem::into_item)))
}
Annotatable::Stmt(stmt) => token::NtStmt(stmt.into_inner()),
Annotatable::Expr(expr) => token::NtExpr(expr),
Annotatable::Arm(..)
| Annotatable::Field(..)
| Annotatable::FieldPat(..)
| Annotatable::GenericParam(..)
| Annotatable::Param(..)
| Annotatable::StructField(..)
| Annotatable::Variant(..) => panic!("unexpected annotatable"),
};
TokenTree::token(token::Interpolated(Lrc::new(nt)), DUMMY_SP).into()
}

pub fn expect_item(self) -> P<ast::Item> {
match self {
Annotatable::Item(i) => i,
Expand Down
37 changes: 6 additions & 31 deletions src/librustc_expand/expand.rs
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Expand Up @@ -10,12 +10,11 @@ use rustc_ast::ast::{ItemKind, MacArgs, MacStmtStyle, StmtKind};
use rustc_ast::mut_visit::*;
use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::{TokenStream, TokenTree};
use rustc_ast::tokenstream::TokenStream;
use rustc_ast::util::map_in_place::MapInPlace;
use rustc_ast::visit::{self, AssocCtxt, Visitor};
use rustc_ast_pretty::pprust;
use rustc_attr::{self as attr, is_builtin_attr, HasAttrs};
use rustc_data_structures::sync::Lrc;
use rustc_errors::{Applicability, FatalError, PResult};
use rustc_feature::Features;
use rustc_parse::configure;
Expand Down Expand Up @@ -668,38 +667,14 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
SyntaxExtensionKind::Attr(expander) => {
self.gate_proc_macro_input(&item);
self.gate_proc_macro_attr_item(span, &item);
// `Annotatable` can be converted into tokens directly, but we are packing it
// into a nonterminal as a piece of AST to make the produced token stream
// look nicer in pretty-printed form. This may be no longer necessary.
let item_tok = TokenTree::token(
token::Interpolated(Lrc::new(match item {
Annotatable::Item(item) => token::NtItem(item),
Annotatable::TraitItem(item) | Annotatable::ImplItem(item) => {
token::NtItem(P(item.and_then(ast::AssocItem::into_item)))
}
Annotatable::ForeignItem(item) => {
token::NtItem(P(item.and_then(ast::ForeignItem::into_item)))
}
Annotatable::Stmt(stmt) => token::NtStmt(stmt.into_inner()),
Annotatable::Expr(expr) => token::NtExpr(expr),
Annotatable::Arm(..)
| Annotatable::Field(..)
| Annotatable::FieldPat(..)
| Annotatable::GenericParam(..)
| Annotatable::Param(..)
| Annotatable::StructField(..)
| Annotatable::Variant(..) => panic!("unexpected annotatable"),
})),
DUMMY_SP,
)
.into();
let item = attr.unwrap_normal_item();
if let MacArgs::Eq(..) = item.args {
let tokens = item.into_tokens();
let attr_item = attr.unwrap_normal_item();
if let MacArgs::Eq(..) = attr_item.args {
self.cx.span_err(span, "key-value macro attributes are not supported");
}
let tok_result =
expander.expand(self.cx, span, item.args.inner_tokens(), item_tok);
self.parse_ast_fragment(tok_result, fragment_kind, &item.path, span)
expander.expand(self.cx, span, attr_item.args.inner_tokens(), tokens);
self.parse_ast_fragment(tok_result, fragment_kind, &attr_item.path, span)
}
SyntaxExtensionKind::LegacyAttr(expander) => {
match validate_attr::parse_meta(self.cx.parse_sess, &attr) {
Expand Down