Implement parser for subscript/superscript with braces.
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@ -194,6 +194,18 @@ pub enum ContextElement<'r, 's> {
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/// unbalanced brackets can be detected in the middle of an
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/// object.
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InlineSourceBlockBracket(InlineSourceBlockBracket<'s>),
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/// Stores the current bracket or parenthesis depth inside a
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/// superscript or superscript.
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///
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/// Inside the braces of a subscript or superscript there must be
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/// balanced braces {}, so this stores the amount of opening
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/// braces subtracted by the amount of closing braces within the
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/// definition must equal zero.
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///
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/// A reference to the position in the string is also included so
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/// unbalanced braces can be detected in the middle of an object.
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SubscriptSuperscriptBrace(SubscriptSuperscriptBrace<'s>),
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}
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pub struct ExitMatcherNode<'r> {
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@ -225,6 +237,12 @@ pub struct InlineSourceBlockBracket<'s> {
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pub depth: usize,
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}
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#[derive(Debug)]
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pub struct SubscriptSuperscriptBrace<'s> {
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pub position: &'s str,
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pub depth: usize,
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}
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impl<'r> std::fmt::Debug for ExitMatcherNode<'r> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let mut formatter = f.debug_struct("ExitMatcherNode");
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@ -16,7 +16,13 @@ use super::Object;
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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::object_parser::standard_set_object;
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use crate::parser::parser_context::ContextElement;
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use crate::parser::parser_context::ExitMatcherNode;
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use crate::parser::parser_context::SubscriptSuperscriptBrace;
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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::util::get_one_before;
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use crate::parser::Subscript;
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@ -79,6 +85,9 @@ fn script_body<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str,
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map(parser_with_context!(script_alphanum)(context), |body| {
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ScriptBody::Braceless(body)
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}),
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map(parser_with_context!(script_with_braces)(context), |body| {
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ScriptBody::WithBraces(body)
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}),
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))(input)
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}
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@ -119,3 +128,77 @@ fn end_script_alphanum_character<'r, 's>(
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)))(remaining)?;
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Ok((remaining, final_char))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn script_with_braces<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, Vec<Object<'s>>> {
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let (remaining, _) = tag("{")(input)?;
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let parser_context = context
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.with_additional_node(ContextElement::SubscriptSuperscriptBrace(
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SubscriptSuperscriptBrace {
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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: &script_with_braces_end,
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}));
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let (remaining, (children, _exit_contents)) = 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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)(remaining)?;
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let (remaining, _) = tag("}")(remaining)?;
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Ok((remaining, children))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn script_with_braces_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 subscript or superscript.");
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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 subscript or superscript brace 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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let close_bracket = tag::<&str, &str, CustomError<&str>>("}")(input);
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if close_bracket.is_ok() {
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return close_bracket;
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}
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}
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return Err(nom::Err::Error(CustomError::MyError(MyError(
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"Not a valid end for subscript or superscript.",
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))));
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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 SubscriptSuperscriptBrace<'s>> {
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for node in context.iter() {
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match node.get_data() {
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ContextElement::SubscriptSuperscriptBrace(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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