64 lines
2.2 KiB
Rust
64 lines
2.2 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
use ast;
|
|
use codemap;
|
|
use ext::base;
|
|
use ext::build::AstBuilder;
|
|
use parse::token;
|
|
|
|
use std::char;
|
|
use std::strbuf::StrBuf;
|
|
|
|
pub fn expand_syntax_ext(cx: &mut base::ExtCtxt,
|
|
sp: codemap::Span,
|
|
tts: &[ast::TokenTree]) -> base::MacResult {
|
|
let es = match base::get_exprs_from_tts(cx, sp, tts) {
|
|
Some(e) => e,
|
|
None => return base::MacResult::dummy_expr(sp)
|
|
};
|
|
let mut accumulator = StrBuf::new();
|
|
for e in es.move_iter() {
|
|
match e.node {
|
|
ast::ExprLit(lit) => {
|
|
match lit.node {
|
|
ast::LitStr(ref s, _) |
|
|
ast::LitFloat(ref s, _) |
|
|
ast::LitFloatUnsuffixed(ref s) => {
|
|
accumulator.push_str(s.get());
|
|
}
|
|
ast::LitChar(c) => {
|
|
accumulator.push_char(char::from_u32(c).unwrap());
|
|
}
|
|
ast::LitInt(i, _) | ast::LitIntUnsuffixed(i) => {
|
|
accumulator.push_str(format!("{}", i));
|
|
}
|
|
ast::LitUint(u, _) => {
|
|
accumulator.push_str(format!("{}", u));
|
|
}
|
|
ast::LitNil => {}
|
|
ast::LitBool(b) => {
|
|
accumulator.push_str(format!("{}", b));
|
|
}
|
|
ast::LitBinary(..) => {
|
|
cx.span_err(e.span, "cannot concatenate a binary literal");
|
|
}
|
|
}
|
|
}
|
|
_ => {
|
|
cx.span_err(e.span, "expected a literal");
|
|
}
|
|
}
|
|
}
|
|
base::MRExpr(cx.expr_str(
|
|
sp,
|
|
token::intern_and_get_ident(accumulator.into_owned())))
|
|
}
|