45 lines
1.5 KiB
Rust
45 lines
1.5 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast;
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use codemap::Span;
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use ext::base::ExtCtxt;
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use ext::base;
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use parse::lexer::{new_tt_reader, reader};
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use parse::parser::Parser;
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use parse::token::keywords;
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pub fn expand_trace_macros(cx: @ExtCtxt,
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sp: Span,
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tt: &[ast::token_tree])
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-> base::MacResult {
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let sess = cx.parse_sess();
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let cfg = cx.cfg();
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let tt_rdr = new_tt_reader(cx.parse_sess().span_diagnostic,
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None,
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tt.to_owned());
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let rdr = tt_rdr as @mut reader;
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let rust_parser = Parser(sess, cfg.clone(), rdr.dup());
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if rust_parser.is_keyword(keywords::True) {
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cx.set_trace_macros(true);
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} else if rust_parser.is_keyword(keywords::False) {
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cx.set_trace_macros(false);
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} else {
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cx.span_fatal(sp, "trace_macros! only accepts `true` or `false`")
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}
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rust_parser.bump();
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let rust_parser = Parser(sess, cfg, rdr.dup());
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let result = rust_parser.parse_expr();
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base::MRExpr(result)
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}
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