185 lines
6.3 KiB
Rust
185 lines
6.3 KiB
Rust
use nom::branch::alt;
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use nom::bytes::complete::tag;
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use nom::bytes::complete::tag_no_case;
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use nom::character::complete::space0;
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use nom::combinator::verify;
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use nom::multi::many_till;
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use super::parser_context::ContextElement;
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use super::Context;
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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::exiting::ExitClass;
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use crate::parser::footnote_definition::label;
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use crate::parser::object_parser::standard_set_object;
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use crate::parser::parser_context::ExitMatcherNode;
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use crate::parser::parser_context::FootnoteReferenceDefinition;
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use crate::parser::parser_with_context::parser_with_context;
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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::FootnoteReference;
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use crate::parser::Object;
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#[tracing::instrument(ret, level = "debug")]
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pub fn footnote_reference<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, FootnoteReference<'s>> {
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alt((
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parser_with_context!(anonymous_footnote)(context),
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parser_with_context!(footnote_reference_only)(context),
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parser_with_context!(inline_footnote)(context),
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))(input)
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}
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#[tracing::instrument(ret, level = "debug")]
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fn anonymous_footnote<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, FootnoteReference<'s>> {
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let (remaining, _) = tag_no_case("[fn::")(input)?;
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let parser_context = context
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.with_additional_node(ContextElement::FootnoteReferenceDefinition(
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FootnoteReferenceDefinition {
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position: remaining,
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depth: 0,
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},
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))
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.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
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class: ExitClass::Beta,
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exit_matcher: &footnote_definition_end,
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}));
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// TODO: I could insert FootnoteReferenceDefinition entries in the context after each matched object to reduce the scanning done for counting brackets which should be more efficient.
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let (remaining, (children, _exit_contents)) = verify(
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many_till(
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parser_with_context!(standard_set_object)(&parser_context),
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parser_with_context!(exit_matcher_parser)(&parser_context),
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),
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|(children, _exit_contents)| !children.is_empty(),
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)(remaining)?;
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let (remaining, _) = tag("]")(remaining)?;
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let (remaining, _) = space0(remaining)?;
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let source = get_consumed(input, remaining);
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Ok((
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remaining,
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FootnoteReference {
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source,
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label: None,
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definition: children,
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},
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))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn inline_footnote<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, FootnoteReference<'s>> {
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let (remaining, _) = tag_no_case("[fn:")(input)?;
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let (remaining, label_contents) = label(remaining)?;
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let (remaining, _) = tag(":")(remaining)?;
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let parser_context = context
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.with_additional_node(ContextElement::FootnoteReferenceDefinition(
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FootnoteReferenceDefinition {
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position: remaining,
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depth: 0,
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},
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))
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.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
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class: ExitClass::Beta,
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exit_matcher: &footnote_definition_end,
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}));
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// TODO: I could insert FootnoteReferenceDefinition entries in the context after each matched object to reduce the scanning done for counting brackets which should be more efficient.
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let (remaining, (children, _exit_contents)) = verify(
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many_till(
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parser_with_context!(standard_set_object)(&parser_context),
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parser_with_context!(exit_matcher_parser)(&parser_context),
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),
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|(children, _exit_contents)| !children.is_empty(),
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)(remaining)?;
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let (remaining, _) = tag("]")(remaining)?;
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let (remaining, _) = space0(remaining)?;
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let source = get_consumed(input, remaining);
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Ok((
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remaining,
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FootnoteReference {
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source,
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label: Some(label_contents),
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definition: children,
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},
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))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn footnote_reference_only<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, FootnoteReference<'s>> {
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let (remaining, _) = tag_no_case("[fn:")(input)?;
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let (remaining, label_contents) = label(remaining)?;
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let (remaining, _) = tag("]")(remaining)?;
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let (remaining, _) = space0(remaining)?;
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let source = get_consumed(input, remaining);
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Ok((
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remaining,
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FootnoteReference {
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source,
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label: Some(label_contents),
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definition: Vec::with_capacity(0),
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},
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))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn definition<'s>(input: &'s str) -> Res<&'s str, Vec<Object<'s>>> {
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Ok((input, vec![]))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn footnote_definition_end<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, &'s str> {
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let context_depth = get_bracket_depth(context)
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.expect("This function should only be called from inside a footnote definition.");
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let text_since_context_entry = get_consumed(context_depth.position, input);
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let mut current_depth = context_depth.depth;
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for c in text_since_context_entry.chars() {
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match c {
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'[' => {
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current_depth += 1;
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}
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']' if current_depth == 0 => {
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panic!("Exceeded footnote reference definition bracket depth.")
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}
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']' if current_depth > 0 => {
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current_depth -= 1;
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}
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_ => {}
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}
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}
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if current_depth > 0 {
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// Its impossible for the next character to end the footnote reference definition if we're any amount of brackets deep
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return Err(nom::Err::Error(CustomError::MyError(MyError(
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"NoFootnoteReferenceDefinitionEnd",
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))));
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}
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tag("]")(input)
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}
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#[tracing::instrument(ret, level = "debug")]
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fn get_bracket_depth<'r, 's>(
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context: Context<'r, 's>,
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) -> Option<&'r FootnoteReferenceDefinition<'s>> {
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for node in context.iter() {
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match node.get_data() {
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ContextElement::FootnoteReferenceDefinition(depth) => return Some(depth),
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_ => {}
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}
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}
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None
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}
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