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https://github.com/mozilla/gecko-dev.git
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da87abc762
Ready for review. Final link step on android fails, but we know how to fix it and will add it to this branch soon. Source-Repo: https://github.com/servo/servo Source-Revision: 2cc08f289ab909de44fa09a07b2c43b70ce379b9 --HG-- rename : servo/ports/gonk/build.rs => servo/support/rust-task_info/build.rs
60 lines
2 KiB
Rust
60 lines
2 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use syntax::ext::base::ExtCtxt;
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use syntax::ext::build::AstBuilder;
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use syntax::codemap::Span;
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use syntax::ast;
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use syntax::ext::base;
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use syntax::parse::token;
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pub fn expand_lower<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
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-> Box<base::MacResult + 'cx> {
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expand_cased(cx, sp, tts, |c| { c.to_lowercase() })
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}
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pub fn expand_upper<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
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-> Box<base::MacResult + 'cx> {
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expand_cased(cx, sp, tts, |c| { c.to_uppercase() })
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}
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fn expand_cased<'cx, T>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree], transform: T)
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-> Box<base::MacResult + 'cx>
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where T: Fn(char) -> char
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{
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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 it = es.iter();
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let res = if let Some(expr) = it.next() {
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if let ast::ExprLit(ref lit) = expr.node {
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if let ast::LitStr(ref s, _) = lit.node {
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Some((s, lit.span))
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} else {
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cx.span_err(expr.span, "expected a string literal");
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None
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}
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} else {
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cx.span_err(expr.span, "expected a string literal");
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None
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}
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} else {
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cx.span_err(sp, "expected 1 argument, found 0");
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None
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};
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match (res, it.count()) {
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(Some((s, span)), 0) => {
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let new_s = s.chars().map(transform).collect::<String>();
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base::MacExpr::new(cx.expr_str(span, token::intern_and_get_ident(new_s.as_slice())))
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}
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(_, rest) => {
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if rest > 0 {
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cx.span_err(sp, format!("expected 1 argument, found {}", rest+1).as_slice());
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}
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base::DummyResult::expr(sp)
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}
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}
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}
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