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Markdown parser fork with extended syntax for personal use.
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2.1 kB · 80 lines
Rust
at hack
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081//! Move across lists of events.
use crate::event::{Event, Kind, Name};
/// Skip from `index`, optionally past `names`.pub fn opt(events: &[Event], index: usize, names: &[Name]) -> usize { skip_opt_impl(events, index, names, true)}
/// Skip from `index`, optionally past `names`, backwards.pub fn opt_back(events: &[Event], index: usize, names: &[Name]) -> usize { skip_opt_impl(events, index, names, false)}
/// Skip from `index` forwards to `names`.pub fn to(events: &[Event], index: usize, names: &[Name]) -> usize { to_impl(events, index, names, true)}
/// Skip from `index` backwards to `names`.pub fn to_back(events: &[Event], index: usize, names: &[Name]) -> usize { to_impl(events, index, names, false)}
/// Skip to something.fn to_impl(events: &[Event], mut index: usize, names: &[Name], forward: bool) -> usize { while index < events.len() { let current = &events[index].name;
if names.contains(current) { break; }
index = if forward { index + 1 } else { index - 1 }; }
index}
/// Skip past things.fn skip_opt_impl(events: &[Event], mut index: usize, names: &[Name], forward: bool) -> usize { let mut balance = 0; let open = if forward { Kind::Enter } else { Kind::Exit };
while index < events.len() { let current = &events[index].name;
if !names.contains(current) || events[index].kind != open { break; }
index = if forward { index + 1 } else { index - 1 }; balance += 1;
loop { balance = if events[index].kind == open { balance + 1 } else { balance - 1 };
let next = if forward { index + 1 } else if index > 0 { index - 1 } else { index };
if events[index].name == *current && balance == 0 { index = next; break; }
index = next; } }
index}