48 lines
1.4 KiB
Rust
48 lines
1.4 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 prelude::*;
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use ast::tt_delim;
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use ast;
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use codemap::span;
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use ext::base::ext_ctxt;
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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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pub fn expand_trace_macros(cx: ext_ctxt, sp: span,
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tt: &[ast::token_tree]) -> 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(
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copy cx.parse_sess().span_diagnostic,
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cx.parse_sess().interner,
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None,
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vec::from_slice(tt)
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);
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let rdr = tt_rdr as reader;
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let rust_parser = Parser(sess, cfg, rdr.dup());
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if rust_parser.is_keyword(~"true") {
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cx.set_trace_macros(true);
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} else if rust_parser.is_keyword(~"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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