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|
//! The text content type.
//!
//! **Text** contains phrasing content such as
//! [attention][crate::construct::attention] (emphasis, strong),
//! [code (text)][crate::construct::code_text], and actual text.
//!
//! The constructs found in text are:
//!
//! * [Attention][crate::construct::attention]
//! * [Autolink][crate::construct::autolink]
//! * [Character escape][crate::construct::character_escape]
//! * [Character reference][crate::construct::character_reference]
//! * [Code (text)][crate::construct::code_text]
//! * [Hard break (escape)][crate::construct::hard_break_escape]
//! * [HTML (text)][crate::construct::html_text]
//! * [Label start (image)][crate::construct::label_start_image]
//! * [Label start (link)][crate::construct::label_start_link]
//! * [Label end][crate::construct::label_end]
//!
//! > 👉 **Note**: for performance reasons, hard break (trailing) is formed by
//! > [whitespace][crate::construct::partial_whitespace].
use crate::construct::partial_whitespace::resolve_whitespace;
use crate::resolve::Name as ResolveName;
use crate::state::{Name as StateName, State};
use crate::tokenizer::Tokenizer;
/// Characters that can start something in text.
const MARKERS: [u8; 9] = [
b'!', // `label_start_image`
b'&', // `character_reference`
b'*', // `attention`
b'<', // `autolink`, `html_text`
b'[', // `label_start_link`
b'\\', // `character_escape`, `hard_break_escape`
b']', // `label_end`
b'_', // `attention`
b'`', // `code_text`
];
/// Start of text.
///
/// ```markdown
/// > | abc
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
tokenizer.register_resolver(ResolveName::Text);
tokenizer.tokenize_state.markers = &MARKERS;
State::Retry(StateName::TextBefore)
}
/// Before text.
///
/// ```markdown
/// > | abc
/// ^
/// ```
pub fn before(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None => State::Ok,
Some(b'!') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::LabelStartImageStart)
}
Some(b'&') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::CharacterReferenceStart)
}
Some(b'*' | b'_') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::AttentionStart)
}
// `autolink`, `html_text` (order does not matter)
Some(b'<') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeHtml),
);
State::Retry(StateName::AutolinkStart)
}
Some(b'[') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::LabelStartLinkStart)
}
Some(b'\\') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeHardBreakEscape),
);
State::Retry(StateName::CharacterEscapeStart)
}
Some(b']') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::LabelEndStart)
}
Some(b'`') => {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::CodeTextStart)
}
_ => State::Retry(StateName::TextBeforeData),
}
}
/// Before html (text).
///
/// At `<`, which wasn’t an autolink.
///
/// ```markdown
/// > | a <b>
/// ^
/// ```
pub fn before_html(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::HtmlTextStart)
}
/// Before hard break escape.
///
/// At `\`, which wasn’t a character escape.
///
/// ```markdown
/// > | a \␊
/// ^
/// ```
pub fn before_hard_break_escape(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::TextBefore),
State::Next(StateName::TextBeforeData),
);
State::Retry(StateName::HardBreakEscapeStart)
}
/// Before data.
///
/// ```markdown
/// > | a
/// ^
/// ```
pub fn before_data(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(State::Next(StateName::TextBefore), State::Nok);
State::Retry(StateName::DataStart)
}
/// Resolve whitespace.
pub fn resolve(tokenizer: &mut Tokenizer) {
resolve_whitespace(
tokenizer,
tokenizer.parse_state.constructs.hard_break_trailing,
true,
);
}
|
