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binary, hex, octal literal types

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russ
2017-10-31 22:02:36 -07:00
parent 896c2f7a08
commit 6cff70f2a3
2 changed files with 102 additions and 0 deletions
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51
src/parser.rs
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@@ -391,6 +391,57 @@ impl<'a> TokenIterator<'a> {
}
}
}
'x' | 'X' => {
result.push(nxt);
self.char_stream.next();
while let Some(&nxt_hex) = self.char_stream.peek() {
match nxt_hex {
'0'...'9' | 'a'...'f' | 'A'...'F' => {
result.push(nxt_hex);
self.char_stream.next();
}
_ => break,
}
}
let out: String = result.iter().cloned().skip(2).collect();
if let Ok(val) = i64::from_str_radix(&out, 16) {
return Some(Token::IntConst(val));
}
}
'o' | 'O' => {
result.push(nxt);
self.char_stream.next();
while let Some(&nxt_oct) = self.char_stream.peek() {
match nxt_oct {
'0'...'8' => {
result.push(nxt_oct);
self.char_stream.next();
}
_ => break,
}
}
let out: String = result.iter().cloned().skip(2).collect();
if let Ok(val) = i64::from_str_radix(&out, 8) {
return Some(Token::IntConst(val));
}
}
'b' | 'B' => {
result.push(nxt);
self.char_stream.next();
while let Some(&nxt_bin) = self.char_stream.peek() {
match nxt_bin {
'0' | '1' | '_' => {
result.push(nxt_bin);
self.char_stream.next();
}
_ => break,
}
}
let out: String = result.iter().cloned().skip(2).filter(|c| c != &'_').collect();
if let Ok(val) = i64::from_str_radix(&out, 2) {
return Some(Token::IntConst(val));
}
}
_ => break,
}
}