44 lines
1.3 KiB
Rust
44 lines
1.3 KiB
Rust
use crate::elements::{fn_def, keyword, Key};
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use crate::headline::Headline;
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use memchr::memchr;
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type Headlines<'a> = Vec<Headline<'a>>;
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type Keywords<'a> = Vec<(Key<'a>, &'a str)>;
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type Footnotes<'a> = Vec<&'a str>;
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pub fn metadata(src: &str) -> (Headlines<'_>, Keywords<'_>, Footnotes<'_>) {
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let mut headlines = Vec::new();
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let mut keywords = Vec::new();
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let mut footnotes = Vec::new();
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for line in src.lines().filter(|l| !l.is_empty()) {
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if line.starts_with('*') {
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let level = memchr(b' ', line.as_bytes()).unwrap_or_else(|| line.len());
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if line.as_bytes()[0..level].iter().all(|&c| c == b'*') {
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headlines.push(Headline::parse(line).0)
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}
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} else if line.starts_with("#+") {
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if let Some((key, value, _)) = keyword::parse(line) {
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keywords.push((key, value))
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}
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} else if line.starts_with("[fn:") {
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if let Some((label, _, _)) = fn_def::parse(line) {
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footnotes.push(label)
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}
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}
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}
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(headlines, keywords, footnotes)
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}
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pub fn toc(src: &str) -> Headlines<'_> {
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metadata(src).0
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}
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pub fn keywords(src: &str) -> Keywords<'_> {
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metadata(src).1
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}
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pub fn fn_def(src: &str) -> Footnotes<'_> {
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metadata(src).2
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}
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