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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 std::collections::HashSet;
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::parser::ParseState;
use crate::subtokenize::subtokenize;
use crate::tokenizer::{Code, Event, EventType, Point, State, StateFnResult, TokenType, Tokenizer};
use crate::util::{
normalize_identifier::normalize_identifier,
span::{from_exit_event, serialize},
};
/// Turn `codes` as the flow content type into events.
pub fn flow(parse_state: &mut ParseState, point: Point, index: usize) -> Vec<Event> {
let mut tokenizer = Tokenizer::new(point, index, parse_state);
tokenizer.push(&parse_state.codes, Box::new(start), true);
let mut next_definitions: HashSet<String> = HashSet::new();
let mut index = 0;
while index < tokenizer.events.len() {
let event = &tokenizer.events[index];
if event.event_type == EventType::Exit
&& event.token_type == TokenType::DefinitionLabelString
{
next_definitions.insert(normalize_identifier(
serialize(
&parse_state.codes,
&from_exit_event(&tokenizer.events, index),
false,
)
.as_str(),
));
}
index += 1;
}
let mut result = (tokenizer.events, false);
parse_state.definitions = next_definitions;
while !result.1 {
result = subtokenize(result.0, parse_state);
}
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),
}
}
/// 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),
_ => tokenizer.attempt_n(
vec![
Box::new(code_indented),
Box::new(code_fenced),
Box::new(html_flow),
Box::new(heading_atx),
Box::new(heading_setext),
Box::new(thematic_break),
Box::new(definition),
],
|ok| Box::new(if ok { after } else { before_paragraph }),
)(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);
// Feel free to interrupt.
tokenizer.interrupt = false;
(State::Fn(Box::new(start)), None)
}
_ => unreachable!("expected eol/eof after blank line `{:?}`", code),
}
}
/// After something.
///
/// ```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)
}
|
