141 lines
5.2 KiB
Rust
141 lines
5.2 KiB
Rust
use nom::branch::alt;
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use nom::bytes::complete::is_not;
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use nom::bytes::complete::tag_no_case;
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use nom::character::complete::line_ending;
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use nom::character::complete::space0;
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use nom::character::complete::space1;
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use nom::combinator::eof;
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use nom::combinator::not;
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use nom::combinator::opt;
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use nom::combinator::verify;
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use nom::multi::many_till;
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use nom::sequence::tuple;
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use super::org_source::OrgSource;
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use super::util::in_section;
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use crate::error::CustomError;
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use crate::error::MyError;
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use crate::error::Res;
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use crate::parser::element_parser::element;
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use crate::parser::greater_element::GreaterBlock;
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use crate::parser::util::blank_line;
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use crate::parser::util::exit_matcher_parser;
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use crate::parser::util::get_consumed;
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use crate::parser::util::start_of_line;
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use crate::parser::Element;
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use crate::parser::Paragraph;
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#[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
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pub fn greater_block<'r, 's>(
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context: RefContext<'_, 'r, 's>,
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input: OrgSource<'s>,
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) -> Res<OrgSource<'s>, GreaterBlock<'s>> {
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// TODO: Do I need to differentiate between different greater block types.
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start_of_line(input)?;
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let (remaining, _leading_whitespace) = space0(input)?;
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let (remaining, (_begin, name)) = tuple((
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tag_no_case("#+begin_"),
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verify(name, |name: &OrgSource<'_>| {
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match Into::<&str>::into(name).to_lowercase().as_str() {
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"comment" | "example" | "export" | "src" | "verse" => false,
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_ => true,
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}
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}),
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))(remaining)?;
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let context_name = match Into::<&str>::into(name).to_lowercase().as_str() {
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"center" => "center block".to_owned(),
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"quote" => "quote block".to_owned(),
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name @ _ => format!("special block {}", name),
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};
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if in_section(context, context_name.as_str()) {
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return Err(nom::Err::Error(CustomError::MyError(MyError(
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"Cannot nest objects of the same element".into(),
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))));
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}
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let exit_with_name = greater_block_end(name.into());
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let (remaining, parameters) = opt(tuple((space1, parameters)))(remaining)?;
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let (remaining, _nl) = line_ending(remaining)?;
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let parser_context = context
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.with_additional_node(ContextElement::ConsumeTrailingWhitespace(true))
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.with_additional_node(ContextElement::Context(context_name.as_str()))
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.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
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class: ExitClass::Alpha,
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exit_matcher: &exit_with_name,
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}));
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let parameters = match parameters {
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Some((_ws, parameters)) => Some(parameters),
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None => None,
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};
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let element_matcher = parser_with_context!(element(true))(&parser_context);
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let exit_matcher = parser_with_context!(exit_matcher_parser)(&parser_context);
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// Check for a completely empty block
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let (remaining, children) = match tuple((
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not(exit_matcher),
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blank_line,
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many_till(blank_line, exit_matcher),
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))(remaining)
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{
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Ok((remain, (_not_immediate_exit, first_line, (_trailing_whitespace, _exit_contents)))) => {
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let mut element = Element::Paragraph(Paragraph::of_text(first_line.into()));
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let source = get_consumed(remaining, remain);
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element.set_source(source.into());
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(remain, vec![element])
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}
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Err(_) => {
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let (remaining, (children, _exit_contents)) =
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many_till(element_matcher, exit_matcher)(remaining)?;
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(remaining, children)
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}
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};
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let (remaining, _end) = exit_with_name(&parser_context, remaining)?;
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// Not checking if parent exit matcher is causing exit because the greater_block_end matcher asserts we matched a full greater block
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let source = get_consumed(input, remaining);
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Ok((
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remaining,
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GreaterBlock {
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source: source.into(),
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name: name.into(),
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parameters: parameters.map(|val| Into::<&str>::into(val)),
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children,
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},
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))
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}
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#[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
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fn name<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
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is_not(" \t\r\n")(input)
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}
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#[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
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fn parameters<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
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is_not("\r\n")(input)
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}
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fn greater_block_end<'x>(
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name: &'x str,
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) -> impl for<'r, 's> Fn(Context<'r, 's>, OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
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// TODO: Can this be done without making an owned copy?
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let name = name.to_owned();
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move |context: Context, input: OrgSource<'_>| _greater_block_end(context, input, name.as_str())
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}
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#[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
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fn _greater_block_end<'r, 's, 'x>(
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_context: RefContext<'_, 'r, 's>,
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input: OrgSource<'s>,
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name: &'x str,
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) -> Res<OrgSource<'s>, OrgSource<'s>> {
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start_of_line(input)?;
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let (remaining, _leading_whitespace) = space0(input)?;
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let (remaining, (_begin, _name, _ws)) = tuple((
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tag_no_case("#+end_"),
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tag_no_case(name),
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alt((eof, line_ending)),
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))(remaining)?;
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let source = get_consumed(input, remaining);
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Ok((remaining, source))
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}
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