Implement parser for inline source blocks.

src/parser/inline_babel_call.rs

@@ -80,7 +80,7 @@ fn header<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s
 #[tracing::instrument(ret, level = "debug")]
 fn header_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
     let context_depth = get_bracket_depth(context)
-        .expect("This function should only be called from inside a inline babel call header.");
+        .expect("This function should only be called from inside an inline babel call header.");
     let text_since_context_entry = get_consumed(context_depth.position, input);
     let mut current_depth = context_depth.depth;
     for c in text_since_context_entry.chars() {
@@ -125,7 +125,7 @@ fn argument<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'
 #[tracing::instrument(ret, level = "debug")]
 fn argument_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
     let context_depth = get_bracket_depth(context)
-        .expect("This function should only be called from inside a inline babel call argument.");
+        .expect("This function should only be called from inside an inline babel call argument.");
     let text_since_context_entry = get_consumed(context_depth.position, input);
     let mut current_depth = context_depth.depth;
     for c in text_since_context_entry.chars() {

src/parser/inline_source_block.rs

@@ -1,6 +1,24 @@
+use nom::bytes::complete::tag;
+use nom::bytes::complete::tag_no_case;
+use nom::character::complete::anychar;
+use nom::character::complete::line_ending;
+use nom::character::complete::one_of;
+use nom::character::complete::space0;
+use nom::combinator::opt;
+use nom::combinator::recognize;
+use nom::combinator::verify;
+use nom::multi::many_till;
+
 use super::Context;
+use crate::error::CustomError;
 use crate::error::Res;
-use crate::parser::util::not_yet_implemented;
+use crate::parser::exiting::ExitClass;
+use crate::parser::parser_context::ContextElement;
+use crate::parser::parser_context::ExitMatcherNode;
+use crate::parser::parser_context::InlineSourceBlockBracket;
+use crate::parser::parser_with_context::parser_with_context;
+use crate::parser::util::exit_matcher_parser;
+use crate::parser::util::get_consumed;
 use crate::parser::InlineSourceBlock;
 
 #[tracing::instrument(ret, level = "debug")]
@@ -8,6 +26,151 @@ pub fn inline_source_block<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, InlineSourceBlock<'s>> {
-    not_yet_implemented()?;
-    todo!()
+    let (remaining, _) = tag_no_case("src_")(input)?;
+    let (remaining, _) = lang(context, remaining)?;
+    let (remaining, _header1) = opt(parser_with_context!(header)(context))(remaining)?;
+    let (remaining, _body) = body(context, remaining)?;
+    let (remaining, _) = space0(remaining)?;
+    let source = get_consumed(input, remaining);
+    Ok((remaining, InlineSourceBlock { source }))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn lang<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    let parser_context =
+        context.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
+            class: ExitClass::Beta,
+            exit_matcher: &lang_end,
+        }));
+    let (remaining, lang) = recognize(many_till(
+        verify(anychar, |c| !(c.is_whitespace() || "[{".contains(*c))),
+        parser_with_context!(exit_matcher_parser)(&parser_context),
+    ))(input)?;
+    Ok((remaining, lang))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn lang_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    recognize(one_of("[{"))(input)
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn header<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    let (remaining, _) = tag("[")(input)?;
+
+    let parser_context = context
+        .with_additional_node(ContextElement::InlineSourceBlockBracket(
+            InlineSourceBlockBracket {
+                position: input,
+                depth: 0,
+            },
+        ))
+        .with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
+            class: ExitClass::Beta,
+            exit_matcher: &header_end,
+        }));
+
+    let (remaining, header_contents) = recognize(many_till(
+        anychar,
+        parser_with_context!(exit_matcher_parser)(&parser_context),
+    ))(remaining)?;
+    let (remaining, _) = tag("]")(remaining)?;
+    Ok((remaining, header_contents))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn header_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    let context_depth = get_bracket_depth(context)
+        .expect("This function should only be called from inside an inline source block header.");
+    let text_since_context_entry = get_consumed(context_depth.position, input);
+    let mut current_depth = context_depth.depth;
+    for c in text_since_context_entry.chars() {
+        match c {
+            '[' => {
+                current_depth += 1;
+            }
+            ']' if current_depth == 0 => {
+                panic!("Exceeded inline source block header bracket depth.")
+            }
+            ']' if current_depth > 0 => {
+                current_depth -= 1;
+            }
+            _ => {}
+        }
+    }
+    if current_depth == 0 {
+        let close_bracket = tag::<&str, &str, CustomError<&str>>("]")(input);
+        if close_bracket.is_ok() {
+            return close_bracket;
+        }
+    }
+
+    line_ending(input)
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn body<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    let (remaining, _) = tag("{")(input)?;
+
+    let parser_context = context
+        .with_additional_node(ContextElement::InlineSourceBlockBracket(
+            InlineSourceBlockBracket {
+                position: input,
+                depth: 0,
+            },
+        ))
+        .with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
+            class: ExitClass::Beta,
+            exit_matcher: &body_end,
+        }));
+
+    let (remaining, body_contents) = recognize(many_till(
+        anychar,
+        parser_with_context!(exit_matcher_parser)(&parser_context),
+    ))(remaining)?;
+    let (remaining, _) = tag("}")(remaining)?;
+    Ok((remaining, body_contents))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn body_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    let context_depth = get_bracket_depth(context)
+        .expect("This function should only be called from inside an inline source block body.");
+    let text_since_context_entry = get_consumed(context_depth.position, input);
+    let mut current_depth = context_depth.depth;
+    for c in text_since_context_entry.chars() {
+        match c {
+            '{' => {
+                current_depth += 1;
+            }
+            '}' if current_depth == 0 => {
+                panic!("Exceeded inline source block body bracket depth.")
+            }
+            '}' if current_depth > 0 => {
+                current_depth -= 1;
+            }
+            _ => {}
+        }
+    }
+    if current_depth == 0 {
+        let close_bracket = tag::<&str, &str, CustomError<&str>>("}")(input);
+        if close_bracket.is_ok() {
+            return close_bracket;
+        }
+    }
+
+    line_ending(input)
+}
+
+#[tracing::instrument(ret, level = "debug")]
+pub fn get_bracket_depth<'r, 's>(
+    context: Context<'r, 's>,
+) -> Option<&'r InlineSourceBlockBracket<'s>> {
+    for node in context.iter() {
+        match node.get_data() {
+            ContextElement::InlineSourceBlockBracket(depth) => return Some(depth),
+            _ => {}
+        }
+    }
+    None
 }

src/parser/parser_context.rs

@@ -181,6 +181,19 @@ pub enum ContextElement<'r, 's> {
     /// unbalanced brackets can be detected in the middle of an
     /// object.
     BabelHeaderBracket(BabelHeaderBracket<'s>),
+
+    /// Stores the current bracket or parenthesis depth inside an inline babel call.
+    ///
+    /// Inside an inline babel call the headers must have balanced
+    /// parentheses () and the arguments must have balanced brackets
+    /// [], so this stores the amount of opening brackets subtracted
+    /// by the amount of closing brackets within the definition must
+    /// equal zero.
+    ///
+    /// A reference to the position in the string is also included so
+    /// unbalanced brackets can be detected in the middle of an
+    /// object.
+    InlineSourceBlockBracket(InlineSourceBlockBracket<'s>),
 }
 
 pub struct ExitMatcherNode<'r> {
@@ -206,6 +219,12 @@ pub struct BabelHeaderBracket<'s> {
     pub depth: usize,
 }
 
+#[derive(Debug)]
+pub struct InlineSourceBlockBracket<'s> {
+    pub position: &'s str,
+    pub depth: usize,
+}
+
 impl<'r> std::fmt::Debug for ExitMatcherNode<'r> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let mut formatter = f.debug_struct("ExitMatcherNode");