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|
//! The flow content type.
//!
//! **Flow** represents the sections, such as headings and code, which are
//! parsed per line.
//! An example is HTML, which has a certain starting condition (such as
//! `<script>` on its own line), then continues for a while, until an end
//! condition is found (such as `</style>`).
//! If that line with an end condition is never found, that flow goes until
//! the end.
//!
//! The constructs found in flow are:
//!
//! * [Blank line][crate::construct::blank_line]
//! * [Code (indented)][crate::construct::code_indented]
//! * [Definition][crate::construct::definition]
//! * [Heading (atx)][crate::construct::heading_atx]
//! * [Heading (setext)][crate::construct::heading_setext]
//! * [HTML (flow)][crate::construct::html_flow]
//! * [Raw (flow)][crate::construct::raw_flow] (code (fenced), math (flow))
//! * [Thematic break][crate::construct::thematic_break]
use crate::event::Name;
use crate::state::{Name as StateName, State};
use crate::tokenizer::Tokenizer;
/// Start of flow.
//
/// ```markdown
/// > | ## alpha
/// ^
/// > | bravo
/// ^
/// > | ***
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'#') => {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeParagraph),
);
State::Retry(StateName::HeadingAtxStart)
}
Some(b'$' | b'`' | b'~') => {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeParagraph),
);
State::Retry(StateName::RawFlowStart)
}
// Note: `-` is also used in setext heading underline so it’s not
// included here.
Some(b'*' | b'_') => {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeParagraph),
);
State::Retry(StateName::ThematicBreakStart)
}
Some(b'<') => {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeParagraph),
);
State::Retry(StateName::HtmlFlowStart)
}
// Note: `-` is also used in thematic breaks so it’s not included here.
Some(b'=') => {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeParagraph),
);
State::Retry(StateName::HeadingSetextStart)
}
Some(b'[') => {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeParagraph),
);
State::Retry(StateName::DefinitionStart)
}
// Actual parsing: blank line? Indented code? Indented anything?
// Also includes `-` which can be a setext heading underline or thematic break.
None | Some(b'\t' | b'\n' | b' ' | b'-') => State::Retry(StateName::FlowBlankLineBefore),
// Must be a paragraph.
Some(_) => {
tokenizer.attempt(State::Next(StateName::FlowAfter), State::Nok);
State::Retry(StateName::ParagraphStart)
}
}
}
/// At blank line.
///
/// ```markdown
/// > | ␠␠␊
/// ^
/// ```
pub fn blank_line_before(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowBlankLineAfter),
State::Next(StateName::FlowBeforeCodeIndented),
);
State::Retry(StateName::BlankLineStart)
}
/// At code (indented).
///
/// ```markdown
/// > | ␠␠␠␠a
/// ^
/// ```
pub fn before_code_indented(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeRaw),
);
State::Retry(StateName::CodeIndentedStart)
}
/// At raw.
///
/// ````markdown
/// > | ```
/// ^
/// ````
pub fn before_raw(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeHtml),
);
State::Retry(StateName::RawFlowStart)
}
/// At html (flow).
///
/// ```markdown
/// > | <a>
/// ^
/// ```
pub fn before_html(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeHeadingAtx),
);
State::Retry(StateName::HtmlFlowStart)
}
/// At heading (atx).
///
/// ```markdown
/// > | # a
/// ^
/// ```
pub fn before_heading_atx(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeHeadingSetext),
);
State::Retry(StateName::HeadingAtxStart)
}
/// At heading (setext).
///
/// ```markdown
/// | a
/// > | =
/// ^
/// ```
pub fn before_heading_setext(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeThematicBreak),
);
State::Retry(StateName::HeadingSetextStart)
}
/// At thematic break.
///
/// ```markdown
/// > | ***
/// ^
/// ```
pub fn before_thematic_break(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeDefinition),
);
State::Retry(StateName::ThematicBreakStart)
}
/// At definition.
///
/// ```markdown
/// > | [a]: b
/// ^
/// ```
pub fn before_definition(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(
State::Next(StateName::FlowAfter),
State::Next(StateName::FlowBeforeParagraph),
);
State::Retry(StateName::DefinitionStart)
}
/// At paragraph.
///
/// ```markdown
/// > | a
/// ^
/// ```
pub fn before_paragraph(tokenizer: &mut Tokenizer) -> State {
tokenizer.attempt(State::Next(StateName::FlowAfter), State::Nok);
State::Retry(StateName::ParagraphStart)
}
/// After blank line.
///
/// ```markdown
/// > | ␠␠␊
/// ^
/// ```
pub fn blank_line_after(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None => State::Ok,
Some(b'\n') => {
tokenizer.enter(Name::BlankLineEnding);
tokenizer.consume();
tokenizer.exit(Name::BlankLineEnding);
// Feel free to interrupt.
tokenizer.interrupt = false;
State::Next(StateName::FlowStart)
}
_ => unreachable!("expected eol/eof"),
}
}
/// After flow.
///
/// ```markdown
/// > | # a␊
/// ^
/// ```
pub fn after(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None => State::Ok,
Some(b'\n') => {
tokenizer.enter(Name::LineEnding);
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
State::Next(StateName::FlowStart)
}
_ => unreachable!("expected eol/eof"),
}
}
|
