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Add some comments to number_literal

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Richard Feldman 2019-09-04 01:26:42 -04:00
parent 3db0e9e5c6
commit 95b43d5554
1 changed files with 7 additions and 0 deletions
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7
src/parse/number_literal.rs
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@ -11,6 +11,7 @@ pub fn number_literal<'a>() -> impl Parser<'a, Expr<'a>> {
match chars.next() { match chars.next() {
Some(first_ch) => { Some(first_ch) => {
// Number literals must start with either an '-' or a digit.
if first_ch == '-' || first_ch.is_ascii_digit() { if first_ch == '-' || first_ch.is_ascii_digit() {
parse_number_literal(first_ch, &mut chars, arena, state) parse_number_literal(first_ch, &mut chars, arena, state)
} else { } else {
@ -42,6 +43,12 @@ where
let mut has_decimal_point = false; let mut has_decimal_point = false;
let mut chars_skipped = 0; let mut chars_skipped = 0;
// Put the first character into the buffer, even if all we've parsed so
// far is a minus sign.
//
// We have to let i64::parse handle the minus sign (if it's there), because
// otherwise if we ask it to parse i64::MIN.to_string() as a positive i64,
// it errors because that positive number doesn't fit in an i64!
before_decimal.push(first_ch); before_decimal.push(first_ch);
while let Some(next_ch) = chars.next() { while let Some(next_ch) = chars.next() {