2013-10-05 23:15:46 -05:00
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// Copyright 2013 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;
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use ext::base;
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use ext::build::AstBuilder;
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2014-01-10 16:02:36 -06:00
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use parse::token;
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2013-10-05 23:15:46 -05:00
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2014-04-02 18:54:22 -05:00
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use std::strbuf::StrBuf;
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2013-12-28 23:06:22 -06:00
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pub fn expand_syntax_ext(cx: &mut base::ExtCtxt,
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sp: codemap::Span,
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tts: &[ast::TokenTree]) -> ~base::MacResult {
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2014-01-17 08:53:10 -06:00
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let es = match base::get_exprs_from_tts(cx, sp, tts) {
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Some(e) => e,
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None => return base::DummyResult::expr(sp)
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};
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let mut accumulator = StrBuf::new();
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for e in es.move_iter() {
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match e.node {
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ast::ExprLit(lit) => {
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match lit.node {
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ast::LitStr(ref s, _) |
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ast::LitFloat(ref s, _) |
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ast::LitFloatUnsuffixed(ref s) => {
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accumulator.push_str(s.get());
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}
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ast::LitChar(c) => {
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accumulator.push_char(c);
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}
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ast::LitInt(i, _) | ast::LitIntUnsuffixed(i) => {
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accumulator.push_str(format!("{}", i));
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}
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ast::LitUint(u, _) => {
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accumulator.push_str(format!("{}", u));
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}
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ast::LitNil => {}
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ast::LitBool(b) => {
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accumulator.push_str(format!("{}", b));
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}
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ast::LitBinary(..) => {
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cx.span_err(e.span, "cannot concatenate a binary literal");
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}
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}
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}
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_ => {
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cx.span_err(e.span, "expected a literal");
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}
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}
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}
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2014-04-15 07:00:14 -05:00
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base::MacExpr::new(cx.expr_str(
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sp,
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token::intern_and_get_ident(accumulator.into_owned())))
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}
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