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Add a fastpath for newlines that don't start with a star.

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This commit is contained in:
Alex Roper 2020-05-14 01:56:55 -07:00
parent 4fe0958843
commit 9cf38d1dc5
1 changed files with 17 additions and 1 deletions
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18
src/parsers.rs
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@ -674,7 +674,8 @@ pub fn parse_headline(input: &str) -> Option<(&str, (&str, usize))> {
// Collect lines until EOF or a headline. // Collect lines until EOF or a headline.
let mut last = 0; let mut last = 0;
for i in memchr_iter(b'\n', text.as_bytes()) { for i in memchr_iter(b'\n', text.as_bytes()) {
if parse_headline_level_le(&text[last..], level).is_ok() { // Check the first byte after the newline to skip parsing unnecessarily.
if text.as_bytes()[last] == b'*' && parse_headline_level_le(&text[last..], level).is_ok() {
break; break;
} }
@ -697,11 +698,26 @@ mod tests {
#[test] #[test]
fn test_parse_headline() { fn test_parse_headline() {
assert_eq!(parse_headline(""), None);
assert_eq!(parse_headline("\n"), None);
assert_eq!(parse_headline("Hello"), None);
assert_eq!(parse_headline("Hello\n"), None);
assert_eq!(parse_headline("Hello\r"), None);
assert_eq!(parse_headline("Hello\n\r"), None);
assert_eq!(parse_headline("Hello\r\n"), None);
assert_eq!(parse_headline("Hello\n*"), None);
assert_eq!(parse_headline("Hello\n\n*"), None);
assert_eq!(parse_headline("Hello\r\n*"), None);
assert_eq!(parse_headline("Hello\n\r\n*"), None);
assert_eq!(parse_headline("Hello\r\n\n*"), None);
assert_eq!(parse_headline("*"), Some(("", ("*", 1)))); assert_eq!(parse_headline("*"), Some(("", ("*", 1))));
assert_eq!(parse_headline("*\n"), Some(("", ("*\n", 1))));
assert_eq!(parse_headline("*\n\r"), Some(("", ("*\n\r", 1))));
assert_eq!(parse_headline("* "), Some(("", ("* ", 1)))); assert_eq!(parse_headline("* "), Some(("", ("* ", 1))));
assert_eq!(parse_headline("* \r"), Some(("", ("* \r", 1)))); assert_eq!(parse_headline("* \r"), Some(("", ("* \r", 1))));
assert_eq!(parse_headline("*\t"), None); assert_eq!(parse_headline("*\t"), None);
assert_eq!(parse_headline("*\t\n"), None); assert_eq!(parse_headline("*\t\n"), None);
assert_eq!(parse_headline("*\r\n"), None);
assert_eq!(parse_headline("* \n"), Some(("", ("* \n", 1)))); assert_eq!(parse_headline("* \n"), Some(("", ("* \n", 1))));
assert_eq!(parse_headline("* \n\r*"), Some(("", ("* \n\r*", 1)))); assert_eq!(parse_headline("* \n\r*"), Some(("", ("* \n\r*", 1))));
assert_eq!(parse_headline("* \n\r**"), Some(("", ("* \n\r**", 1)))); assert_eq!(parse_headline("* \n\r**"), Some(("", ("* \n\r**", 1))));