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libhexfloat: Remove all uses of ~str from libhexfloat

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This commit is contained in:
Patrick Walton 2014-05-12 20:35:23 -07:00
parent 27977e41fc
commit bf249b4411
1 changed files with 17 additions and 8 deletions
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25
src/libhexfloat/lib.rs
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@ -70,30 +70,39 @@ pub fn macro_registrar(register: |Name, SyntaxExtension|) {
//Check if the literal is valid (as LLVM expects),
//and return a descriptive error if not.
fn hex_float_lit_err(s: &str) -> Option<(uint, ~str)> {
fn hex_float_lit_err(s: &str) -> Option<(uint, StrBuf)> {
let mut chars = s.chars().peekable();
let mut i = 0;
if chars.peek() == Some(&'-') { chars.next(); i+= 1 }
if chars.next() != Some('0') { return Some((i, "Expected '0'".to_owned())); } i+=1;
if chars.next() != Some('x') { return Some((i, "Expected 'x'".to_owned())); } i+=1;
if chars.next() != Some('0') {
return Some((i, "Expected '0'".to_strbuf()));
} i+=1;
if chars.next() != Some('x') {
return Some((i, "Expected 'x'".to_strbuf()));
} i+=1;
let mut d_len = 0;
for _ in chars.take_while(|c| c.is_digit_radix(16)) { chars.next(); i+=1; d_len += 1;}
if chars.next() != Some('.') { return Some((i, "Expected '.'".to_owned())); } i+=1;
if chars.next() != Some('.') {
return Some((i, "Expected '.'".to_strbuf()));
} i+=1;
let mut f_len = 0;
for _ in chars.take_while(|c| c.is_digit_radix(16)) { chars.next(); i+=1; f_len += 1;}
if d_len == 0 && f_len == 0 {
return Some((i, "Expected digits before or after decimal point".to_owned()));
return Some((i, "Expected digits before or after decimal \
point".to_strbuf()));
}
if chars.next() != Some('p') { return Some((i, "Expected 'p'".to_owned())); } i+=1;
if chars.next() != Some('p') {
return Some((i, "Expected 'p'".to_strbuf()));
} i+=1;
if chars.peek() == Some(&'-') { chars.next(); i+= 1 }
let mut e_len = 0;
for _ in chars.take_while(|c| c.is_digit()) { chars.next(); i+=1; e_len += 1}
if e_len == 0 {
return Some((i, "Expected exponent digits".to_owned()));
return Some((i, "Expected exponent digits".to_strbuf()));
}
match chars.next() {
None => None,
Some(_) => Some((i, "Expected end of string".to_owned()))
Some(_) => Some((i, "Expected end of string".to_strbuf()))
}
}