70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
use rustc_ast as ast;
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use rustc_ast::ptr::P;
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use rustc_ast::token::{self, Token};
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use rustc_ast::tokenstream::{TokenStream, TokenTree};
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use rustc_expand::base::{self, *};
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use rustc_span::symbol::{Ident, Symbol};
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use rustc_span::Span;
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pub fn expand_concat_idents<'cx>(
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cx: &'cx mut ExtCtxt<'_>,
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sp: Span,
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tts: TokenStream,
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) -> Box<dyn base::MacResult + 'cx> {
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if tts.is_empty() {
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cx.span_err(sp, "concat_idents! takes 1 or more arguments.");
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return DummyResult::any(sp);
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}
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let mut res_str = String::new();
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for (i, e) in tts.into_trees().enumerate() {
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if i & 1 == 1 {
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match e {
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TokenTree::Token(Token { kind: token::Comma, .. }) => {}
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_ => {
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cx.span_err(sp, "concat_idents! expecting comma.");
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return DummyResult::any(sp);
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}
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}
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} else {
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match e {
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TokenTree::Token(Token { kind: token::Ident(name, _), .. }) => {
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res_str.push_str(&name.as_str())
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}
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_ => {
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cx.span_err(sp, "concat_idents! requires ident args.");
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return DummyResult::any(sp);
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}
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}
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}
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}
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let ident = Ident::new(Symbol::intern(&res_str), cx.with_call_site_ctxt(sp));
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struct ConcatIdentsResult {
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ident: Ident,
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}
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impl base::MacResult for ConcatIdentsResult {
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fn make_expr(self: Box<Self>) -> Option<P<ast::Expr>> {
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Some(P(ast::Expr {
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id: ast::DUMMY_NODE_ID,
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kind: ast::ExprKind::Path(None, ast::Path::from_ident(self.ident)),
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span: self.ident.span,
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attrs: ast::AttrVec::new(),
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tokens: None,
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}))
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}
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fn make_ty(self: Box<Self>) -> Option<P<ast::Ty>> {
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Some(P(ast::Ty {
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id: ast::DUMMY_NODE_ID,
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kind: ast::TyKind::Path(None, ast::Path::from_ident(self.ident)),
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span: self.ident.span,
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}))
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}
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}
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Box::new(ConcatIdentsResult { ident })
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}
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