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Added a help span which informs the user about the escaping of curly braces in a format string if a wrongly escaped one is detected in a string.

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This commit is contained in:
Manuel Hoffmann 2015-04-13 15:56:10 +02:00
parent 0a2885ad94
commit 4abade50d7
2 changed files with 25 additions and 1 deletions
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8
src/libsyntax/parse/lexer/mod.rs
View File

@ -843,13 +843,19 @@ impl<'a> StringReader<'a> {
if ascii_only { "unknown byte escape" }
else { "unknown character escape" },
c);
let sp = codemap::mk_sp(escaped_pos, last_pos);
if e == '\r' {
let sp = codemap::mk_sp(escaped_pos, last_pos);
self.span_diagnostic.span_help(
sp,
"this is an isolated carriage return; consider checking \
your editor and version control settings")
}
if (e == '{' || e == '}') && !ascii_only {
self.span_diagnostic.span_help(
sp,
"if used in a formatting string, \
curly braces are escaped with `{{` and `}}`")
}
false
}
}

18
src/test/parse-fail/wrong-escape-of-curly-braces.rs Normal file
View File

@ -0,0 +1,18 @@
// Copyright 2015 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.
fn f() {
let ok = "{{everything fine}}";
let bad = "\{it is wrong\}";
//~^ ERROR unknown character escape: {
//~^^ HELP if used in a formatting string, curly braces are escaped with `{{` and `}}`
//~^^^ ERROR unknown character escape: }
//~^^^^ HELP if used in a formatting string, curly braces are escaped with `{{` and `}}`
}