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refactor number parsing to reduce nesting

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This commit is contained in:
ConnorSkees 2020-05-23 01:49:21 -04:00
parent cc15d46f9b
commit bc12c0b4e7
1 changed files with 20 additions and 25 deletions
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45
src/utils/number.rs
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@ -84,35 +84,30 @@ pub(crate) fn eat_number<I: Iterator<Item = Token>>(
let mut times_ten = String::new();
let mut times_ten_is_postive = true;
loop {
match toks.peek() {
// TODO: https://github.com/rust-lang/rust/issues/54883
Some(Token { kind: 'e', .. }) | Some(Token { kind: 'E', .. }) => {
if toks.peek_forward(1).is_none() {
break;
} else {
let Token { kind, pos } = *toks.peek().unwrap();
match kind {
'-' => {
toks.next();
times_ten_is_postive = false;
}
'0'..='9' => {}
_ => break,
}
// TODO: https://github.com/rust-lang/rust/issues/54883
if let Some(Token { kind: 'e', .. }) | Some(Token { kind: 'E', .. }) = toks.peek() {
let t = if let Some(tok) = toks.peek_forward(1) {
*tok
} else {
break;
};
match t.kind {
'-' => {
toks.next();
eat_whole_number(toks, &mut times_ten);
if times_ten.is_empty() && !times_ten_is_postive {
if let Some(t) = toks.peek() {
return Err(("Expected digit.", t.pos()).into());
}
return Err(("Expected digit.", pos).into());
}
times_ten_is_postive = false;
}
'0'..='9' => {}
_ => break,
}
toks.next();
eat_whole_number(toks, &mut times_ten);
if times_ten.is_empty() && !times_ten_is_postive {
return Err(("Expected digit.", toks.peek().unwrap_or(&t).pos).into());
}
Some(..) | None => break,
}
break;
}