67 lines
2.4 KiB
Rust
67 lines
2.4 KiB
Rust
// 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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use parse::token;
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use std::string::String;
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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])
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-> Box<base::MacResult+'static> {
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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 = String::new();
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for e in es {
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match e.node {
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ast::ExprLit(ref 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(c);
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}
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ast::LitInt(i, ast::UnsignedIntLit(_)) |
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ast::LitInt(i, ast::SignedIntLit(_, ast::Plus)) |
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ast::LitInt(i, ast::UnsuffixedIntLit(ast::Plus)) => {
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accumulator.push_str(&format!("{}", i)[]);
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}
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ast::LitInt(i, ast::SignedIntLit(_, ast::Minus)) |
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ast::LitInt(i, ast::UnsuffixedIntLit(ast::Minus)) => {
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accumulator.push_str(&format!("-{}", i)[]);
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}
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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::LitByte(..) |
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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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base::MacExpr::new(cx.expr_str(
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sp,
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token::intern_and_get_ident(&accumulator[])))
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}
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