80 lines
3.0 KiB
Rust
80 lines
3.0 KiB
Rust
use rustc_ast as ast;
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use rustc_ast::tokenstream::TokenStream;
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use rustc_expand::base::{self, DummyResult};
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use rustc_session::errors::report_lit_error;
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use rustc_span::symbol::Symbol;
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use crate::errors;
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pub fn expand_concat(
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cx: &mut base::ExtCtxt<'_>,
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sp: rustc_span::Span,
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tts: TokenStream,
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) -> Box<dyn base::MacResult + 'static> {
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let Some(es) = base::get_exprs_from_tts(cx, tts) else {
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return DummyResult::any(sp);
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};
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let mut accumulator = String::new();
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let mut missing_literal = vec![];
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let mut has_errors = false;
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for e in es {
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match e.kind {
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ast::ExprKind::Lit(token_lit) => match ast::LitKind::from_token_lit(token_lit) {
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Ok(ast::LitKind::Str(s, _) | ast::LitKind::Float(s, _)) => {
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accumulator.push_str(s.as_str());
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}
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Ok(ast::LitKind::Char(c)) => {
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accumulator.push(c);
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}
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Ok(ast::LitKind::Int(i, _)) => {
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accumulator.push_str(&i.to_string());
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}
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Ok(ast::LitKind::Bool(b)) => {
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accumulator.push_str(&b.to_string());
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}
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Ok(ast::LitKind::Byte(..) | ast::LitKind::ByteStr(..)) => {
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cx.emit_err(errors::ConcatBytestr { span: e.span });
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has_errors = true;
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}
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Ok(ast::LitKind::Err) => {
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has_errors = true;
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}
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Err(err) => {
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report_lit_error(&cx.sess.parse_sess, err, token_lit, e.span);
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has_errors = true;
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}
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},
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// We also want to allow negative numeric literals.
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ast::ExprKind::Unary(ast::UnOp::Neg, ref expr) if let ast::ExprKind::Lit(token_lit) = expr.kind => {
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match ast::LitKind::from_token_lit(token_lit) {
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Ok(ast::LitKind::Int(i, _)) => accumulator.push_str(&format!("-{i}")),
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Ok(ast::LitKind::Float(f, _)) => accumulator.push_str(&format!("-{f}")),
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Err(err) => {
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report_lit_error(&cx.sess.parse_sess, err, token_lit, e.span);
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has_errors = true;
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}
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_ => missing_literal.push(e.span),
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}
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}
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ast::ExprKind::IncludedBytes(..) => {
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cx.emit_err(errors::ConcatBytestr { span: e.span });
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}
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ast::ExprKind::Err => {
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has_errors = true;
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}
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_ => {
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missing_literal.push(e.span);
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}
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}
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}
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if !missing_literal.is_empty() {
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cx.emit_err(errors::ConcatMissingLiteral { spans: missing_literal });
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return DummyResult::any(sp);
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} else if has_errors {
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return DummyResult::any(sp);
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}
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let sp = cx.with_def_site_ctxt(sp);
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base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&accumulator)))
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}
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