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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 (fenced)][crate::construct::code_fenced]
//! * [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]
//! * [Thematic break][crate::construct::thematic_break]
use crate::construct::{
blank_line::start as blank_line, code_fenced::start as code_fenced,
code_indented::start as code_indented, definition::start as definition,
heading_atx::start as heading_atx, heading_setext::start as heading_setext,
html_flow::start as html_flow, paragraph::start as paragraph,
thematic_break::start as thematic_break,
};
use crate::subtokenize::subtokenize;
use crate::tokenizer::{Code, Event, Point, State, StateFnResult, TokenType, Tokenizer};
/// Turn `codes` as the flow content type into events.
pub fn flow(codes: &[Code], point: Point, index: usize) -> Vec<Event> {
let mut tokenizer = Tokenizer::new(point, index);
tokenizer.feed(codes, Box::new(start), true);
let mut result = (tokenizer.events, false);
while !result.1 {
result = subtokenize(result.0, codes);
}
result.0
}
/// Before flow.
///
/// First we assume a blank line.
//
/// ```markdown
/// |
/// |## alpha
/// | bravo
/// |***
/// ```
fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::None => (State::Ok, None),
_ => tokenizer.attempt(blank_line, |ok| {
Box::new(if ok { blank_line_after } else { initial_before })
})(tokenizer, code),
}
}
/// After a blank line.
///
/// Move to `start` afterwards.
///
/// ```markdown
/// ␠␠|
/// ```
fn blank_line_after(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::None => (State::Ok, None),
Code::CarriageReturnLineFeed | Code::Char('\n' | '\r') => {
tokenizer.enter(TokenType::BlankLineEnding);
tokenizer.consume(code);
tokenizer.exit(TokenType::BlankLineEnding);
(State::Fn(Box::new(start)), None)
}
_ => unreachable!("expected eol/eof after blank line `{:?}`", code),
}
}
/// Before flow (initial).
///
/// “Initial” flow means unprefixed flow, so right at the start of a line.
/// Interestingly, the only flow (initial) construct is indented code.
/// Move to `before` afterwards.
///
/// ```markdown
/// |qwe
/// | asd
/// |~~~js
/// |<div>
/// ```
fn initial_before(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::None => (State::Ok, None),
// To do: should all flow just start before the prefix?
_ => tokenizer.attempt_7(
code_indented,
code_fenced,
html_flow,
heading_atx,
thematic_break,
definition,
heading_setext,
|ok| Box::new(if ok { after } else { before_paragraph }),
)(tokenizer, code),
}
}
/// After a flow construct.
///
/// ```markdown
/// ## alpha|
/// |
/// ~~~js
/// asd
/// ~~~|
/// ```
fn after(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::None => (State::Ok, None),
Code::CarriageReturnLineFeed | Code::Char('\n' | '\r') => {
tokenizer.enter(TokenType::LineEnding);
tokenizer.consume(code);
tokenizer.exit(TokenType::LineEnding);
(State::Fn(Box::new(start)), None)
}
_ => unreachable!("unexpected non-eol/eof after flow `{:?}`", code),
}
}
/// Before a paragraph.
///
/// ```markdown
/// |asd
/// ```
fn before_paragraph(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
tokenizer.go(paragraph, after)(tokenizer, code)
}
|
