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Remove insertion on non alphabetic initial headings

This commit is contained in:
Weihang Lo 2018-09-09 11:52:32 +08:00
parent 43b3d157d9
commit d729a762fe
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GPG Key ID: D7DBF189825E82E7
1 changed files with 4 additions and 12 deletions
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16
src/utils/mod.rs
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@ -21,9 +21,10 @@ pub fn collapse_whitespace<'a>(text: &'a str) -> Cow<'a, str> {
RE.replace_all(text, " ") RE.replace_all(text, " ")
} }
/// Convert the given string to a valid HTML element ID /// Convert the given string to a valid HTML element ID.
/// The only restriction is that the ID must not contain any ASCII whitespace.
pub fn normalize_id(content: &str) -> String { pub fn normalize_id(content: &str) -> String {
let mut ret = content content
.chars() .chars()
.filter_map(|ch| { .filter_map(|ch| {
if ch.is_alphanumeric() || ch == '_' || ch == '-' { if ch.is_alphanumeric() || ch == '_' || ch == '-' {
@ -33,16 +34,7 @@ pub fn normalize_id(content: &str) -> String {
} else { } else {
None None
} }
}).collect::<String>(); }).collect::<String>()
// Ensure that the first character is [A-Za-z]
if ret
.chars()
.next()
.map_or(false, |c| !c.is_ascii_alphabetic())
{
ret.insert(0, 'a');
}
ret
} }
/// Generate an ID for use with anchors which is derived from a "normalised" /// Generate an ID for use with anchors which is derived from a "normalised"