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Markdown parser fork with extended syntax for personal use.
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3.0 kB · 98 lines
Rust
at hack
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899//! wikilink occurs in the [[text]][] content type.//!//! ## Grammar//!//! ```bnf//! wikilink ::= '[[' label opt_alias opt_heading opt_block ']]'//!//! opt_alias ::= '|' label | ''//! opt_heading ::= '#' label | ''//! opt_block ::= '^' label | ''//!//! ; See the `label` constructs for the BNF of//! ; those parts.//! ```//!
use crate::event::Name;use crate::state::Name as MoveName;use crate::state::State;use crate::tokenizer::{Label, LabelKind, LabelStart, Tokenizer};
/// Start of label (link) start.////// ```markdown/// > | a [b] c/// ^/// ```pub fn start(tokenizer: &mut Tokenizer) -> State { if !tokenizer.parse_state.options.constructs.wikilink { return State::Retry(MoveName::TextBeforeLabelStartLink); }
let start_conditions = tokenizer.current == Some(b'[');
if start_conditions && tokenizer.tokenize_state.size == 0 { tokenizer.tokenize_state.size += 1; tokenizer.attempt( State::Next(MoveName::WikilinkLabelStart), State::Next(MoveName::TextBeforeLabelStartLink), );
tokenizer.consume(); State::Next(MoveName::WikilinkStart) } else if start_conditions && tokenizer.tokenize_state.size == 1 { tokenizer.tokenize_state.size = 0; let start = tokenizer.events.len();
tokenizer.enter(Name::WikilinkStart); // // tokenizer.enter(Name::LabelMarker); tokenizer.consume(); // // tokenizer.exit(Name::LabelMarker); tokenizer.exit(Name::WikilinkStart);
tokenizer.tokenize_state.wikilink_starts.push(LabelStart { kind: LabelKind::Link, start: (start, tokenizer.events.len()), inactive: false, }); State::Ok } else { tokenizer.tokenize_state.size = 0;
// Resume the "regular" sequence of state transitions State::Nok // State::Retry(MoveName::TextBeforeLabelStartLink) }}
pub fn end(tokenizer: &mut Tokenizer) -> State { if Some(b']') == tokenizer.current && Some(b']') == tokenizer.previous && tokenizer.parse_state.options.constructs.wikilink && !tokenizer.tokenize_state.wikilink_starts.is_empty() { let wikilink_start = tokenizer.tokenize_state.wikilink_starts.last().unwrap(); tokenizer.tokenize_state.end = tokenizer.events.len();
// If the corresponding label (link) start is marked as inactive, // it means we’d be wrapping a link, like this: // // ```markdown // > | a [b [c](d) e](f) g. // ^ // ``` // // We can’t have that, so it’s just balanced brackets. if wikilink_start.inactive { return State::Retry(MoveName::WikilinkEndNok); }
tokenizer.enter(Name::WikilinkEnd); tokenizer.consume(); tokenizer.exit(Name::WikilinkEnd); return State::Ok; }
State::Nok}