Implement radio targets.

src/parser/radio_link.rs

@@ -1,7 +1,21 @@
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::character::complete::line_ending;
+use nom::character::complete::space0;
+use nom::combinator::verify;
+use nom::multi::many_till;
+
 use super::Context;
 use crate::error::CustomError;
 use crate::error::MyError;
 use crate::error::Res;
+use crate::parser::exiting::ExitClass;
+use crate::parser::object_parser::minimal_set_object;
+use crate::parser::parser_context::ContextElement;
+use crate::parser::parser_context::ExitMatcherNode;
+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::RadioLink;
 use crate::parser::RadioTarget;
 
@@ -17,7 +31,28 @@ pub fn radio_target<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, RadioTarget<'s>> {
-    return Err(nom::Err::Error(CustomError::MyError(MyError(
-        "Not implemented yet.",
-    ))));
+    let (remaining, _opening) = tag("<<<")(input)?;
+    let parser_context =
+        context.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
+            class: ExitClass::Beta,
+            exit_matcher: &radio_target_end,
+        }));
+
+    let (remaining, (children, _exit_contents)) = verify(
+        many_till(
+            parser_with_context!(minimal_set_object)(&parser_context),
+            parser_with_context!(exit_matcher_parser)(&parser_context),
+        ),
+        |(children, _exit_contents)| !children.is_empty(),
+    )(remaining)?;
+
+    let (remaining, _closing) = tag(">>>")(remaining)?;
+    let (remaining, _trailing_whitespace) = space0(remaining)?;
+    let source = get_consumed(input, remaining);
+    Ok((remaining, RadioTarget { source, children }))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn radio_target_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    alt((tag("<"), tag(">"), line_ending))(input)
 }