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//! Code (indented) occurs in the [flow][] content type.
//!
//! ## Grammar
//!
//! Code (indented) forms with the following BNF
//! (<small>see [construct][crate::construct] for character groups</small>):
//!
//! ```bnf
//! code_indented ::= filled_line *( eol *( blank_line eol ) filled_line )
//!
//! ; Restriction: at least one `line` byte must be `text`.
//! filled_line ::= 4(space_or_tab) *line
//! blank_line ::= *space_or_tab
//! ```
//!
//! As this construct occurs in flow, like all flow constructs, it must be
//! followed by an eol (line ending) or eof (end of file).
//!
//! In markdown, it is also possible to use [code (text)][raw_text] in the
//! [text][] content type.
//! It is also possible to create code with the [code (fenced)][code_fenced]
//! construct.
//!
//! ## HTML
//!
//! Code (indented) relates to both the `<pre>` and the `<code>` elements in
//! HTML.
//! See [*§ 4.4.3 The `pre` element*][html_pre] and the [*§ 4.5.15 The `code`
//! element*][html_code] in the HTML spec for more info.
//!
//! ## Recommendation
//!
//! It is recommended to use code (fenced) instead of code (indented).
//! Code (fenced) is more explicit, similar to code (text), and has support
//! for specifying the programming language.
//!
//! ## Tokens
//!
//! * [`CodeIndented`][Name::CodeIndented]
//! * [`CodeFlowChunk`][Name::CodeFlowChunk]
//! * [`LineEnding`][Name::LineEnding]
//! * [`SpaceOrTab`][Name::SpaceOrTab]
//!
//! ## References
//!
//! * [`code-indented.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-core-commonmark/dev/lib/code-indented.js)
//! * [*§ 4.4 Indented code blocks* in `CommonMark`](https://spec.commonmark.org/0.30/#indented-code-blocks)
//!
//! [flow]: crate::construct::flow
//! [text]: crate::construct::text
//! [code_fenced]: crate::construct::code_fenced
//! [raw_text]: crate::construct::raw_text
//! [html_code]: https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-code-element
//! [html_pre]: https://html.spec.whatwg.org/multipage/grouping-content.html#the-pre-element
use crate::construct::partial_space_or_tab::{space_or_tab, space_or_tab_min_max};
use crate::event::Name;
use crate::state::{Name as StateName, State};
use crate::tokenizer::Tokenizer;
use crate::util::constant::TAB_SIZE;
/// Start of code (indented).
///
/// > **Parsing note**: it is not needed to check if this first line is a
/// > filled line (that it has a non-whitespace character), because blank lines
/// > are parsed already, so we never run into that.
///
/// ```markdown
/// > | aaa
/// ^
/// ```
pub fn start(tokenizer: &mut Tokenizer) -> State {
// Do not interrupt paragraphs.
if !tokenizer.interrupt
&& tokenizer.parse_state.options.constructs.code_indented
&& matches!(tokenizer.current, Some(b'\t' | b' '))
{
tokenizer.enter(Name::CodeIndented);
tokenizer.attempt(State::Next(StateName::CodeIndentedAtBreak), State::Nok);
State::Retry(space_or_tab_min_max(tokenizer, TAB_SIZE, TAB_SIZE))
} else {
State::Nok
}
}
/// At a break.
///
/// ```markdown
/// > | aaa
/// ^ ^
/// ```
pub fn at_break(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None => State::Retry(StateName::CodeIndentedAfter),
Some(b'\n') => {
tokenizer.attempt(
State::Next(StateName::CodeIndentedAtBreak),
State::Next(StateName::CodeIndentedAfter),
);
State::Retry(StateName::CodeIndentedFurtherStart)
}
_ => {
tokenizer.enter(Name::CodeFlowChunk);
State::Retry(StateName::CodeIndentedInside)
}
}
}
/// In code content.
///
/// ```markdown
/// > | aaa
/// ^^^^
/// ```
pub fn inside(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
None | Some(b'\n') => {
tokenizer.exit(Name::CodeFlowChunk);
State::Retry(StateName::CodeIndentedAtBreak)
}
_ => {
tokenizer.consume();
State::Next(StateName::CodeIndentedInside)
}
}
}
/// After indented code.
///
/// ```markdown
/// > | aaa
/// ^
/// ```
pub fn after(tokenizer: &mut Tokenizer) -> State {
tokenizer.exit(Name::CodeIndented);
// Feel free to interrupt.
tokenizer.interrupt = false;
State::Ok
}
/// At eol, trying to parse another indent.
///
/// ```markdown
/// > | aaa
/// ^
/// | bbb
/// ```
pub fn further_start(tokenizer: &mut Tokenizer) -> State {
if tokenizer.lazy {
return State::Nok;
}
if tokenizer.current == Some(b'\n') {
tokenizer.enter(Name::LineEnding);
tokenizer.consume();
tokenizer.exit(Name::LineEnding);
State::Next(StateName::CodeIndentedFurtherStart)
} else {
tokenizer.attempt(State::Ok, State::Next(StateName::CodeIndentedFurtherBegin));
State::Retry(space_or_tab_min_max(tokenizer, TAB_SIZE, TAB_SIZE))
}
}
/// At the beginning of a line that is not indented enough.
///
/// ```markdown
/// | aaa
/// > | bbb
/// ^
/// ```
pub fn further_begin(tokenizer: &mut Tokenizer) -> State {
if matches!(tokenizer.current, Some(b'\t' | b' ')) {
tokenizer.attempt(State::Next(StateName::CodeIndentedFurtherAfter), State::Nok);
State::Retry(space_or_tab(tokenizer))
} else {
State::Nok
}
}
/// After whitespace, not indented enough.
///
/// ```markdown
/// | aaa
/// > | bbb
/// ^
/// ```
pub fn further_after(tokenizer: &mut Tokenizer) -> State {
match tokenizer.current {
Some(b'\n') => State::Retry(StateName::CodeIndentedFurtherStart),
_ => State::Nok,
}
}
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