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Markdown parser fork with extended syntax for personal use.
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3.3 kB · 119 lines
Rust
at main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120//! Label start (image) occurs in the [text][] content type.//!//! ## Grammar//!//! Label start (image) forms with the following BNF//! (<small>see [construct][crate::construct] for character groups</small>)://!//! ```bnf//! label_start_image ::= '!' '['//! ```//!//! ## HTML//!//! Label start (image) does not, on its own, relate to anything in HTML.//! When matched with a [label end][label_end], they together relate to the//! `<img>` element in HTML.//! See [*§ 4.8.3 The `img` element*][html_img] in the HTML spec for more info.//! Without an end, the characters (`![`) are output.//!//! ## Tokens//!//! * [`LabelImage`][Name::LabelImage]//! * [`LabelImageMarker`][Name::LabelImageMarker]//! * [`LabelMarker`][Name::LabelMarker]//!//! ## References//!//! * [`label-start-image.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-core-commonmark/dev/lib/label-start-image.js)//! * [*§ 6.4 Images* in `CommonMark`](https://spec.commonmark.org/0.31/#images)//!//! [text]: crate::construct::text//! [label_end]: crate::construct::label_end//! [html_img]: https://html.spec.whatwg.org/multipage/embedded-content.html#the-img-element
use crate::event::Name;use crate::resolve::Name as ResolveName;use crate::state::{Name as StateName, State};use crate::tokenizer::{LabelKind, LabelStart, Tokenizer};
/// Start of label (image) start.////// ```markdown/// > | a ![b] c/// ^/// ```pub fn start(tokenizer: &mut Tokenizer) -> State { if tokenizer.parse_state.options.constructs.label_start_image && tokenizer.current == Some(b'!') { tokenizer.enter(Name::LabelImage); tokenizer.enter(Name::LabelImageMarker); tokenizer.consume(); tokenizer.exit(Name::LabelImageMarker); State::Next(StateName::LabelStartImageOpen) } else { State::Nok }}
/// After `!`, at `[`.////// ```markdown/// > | a ![b] c/// ^/// ```pub fn open(tokenizer: &mut Tokenizer) -> State { match tokenizer.current { Some(b'[') => { tokenizer.enter(Name::LabelMarker); tokenizer.consume(); tokenizer.exit(Name::LabelMarker); tokenizer.exit(Name::LabelImage); State::Next(StateName::LabelStartImageAfter) } _ => State::Nok, }}
/// After `![`.////// ```markdown/// > | a ![b] c/// ^/// ```////// This is needed in because, when GFM footnotes are enabled, images never/// form when started with a `^`./// Instead, links form:////// ```markdown/// ////// ![^a][b]////// [b]: c/// ```////// ```html/// <p>!<a href=\"b\">^a</a></p>/// <p>!<a href=\"c\">^a</a></p>/// ```pub fn after(tokenizer: &mut Tokenizer) -> State { if tokenizer .parse_state .options .constructs .gfm_label_start_footnote && tokenizer.current == Some(b'^') { State::Nok } else { tokenizer.tokenize_state.label_starts.push(LabelStart { kind: LabelKind::Image, start: (tokenizer.events.len() - 6, tokenizer.events.len() - 1), inactive: false, }); tokenizer.register_resolver_before(ResolveName::Label); State::Ok }}