First attempt at text markup.

src/parser/lesser_element.rs

@@ -1,6 +1,6 @@
 use super::object::Object;
-use super::object::TextMarkup;
 use super::source::Source;
+use super::PlainText;
 
 #[derive(Debug)]
 pub struct Paragraph<'s> {
@@ -97,7 +97,7 @@ pub struct LatexEnvironment<'s> {
 impl<'s> Paragraph<'s> {
     pub fn of_text(input: &'s str) -> Self {
         let mut objects = Vec::with_capacity(1);
-        objects.push(Object::TextMarkup(TextMarkup { source: input }));
+        objects.push(Object::PlainText(PlainText { source: input }));
         Paragraph {
             source: input,
             children: objects,

src/parser/object.rs

@@ -14,6 +14,7 @@ pub enum Object<'s> {
 #[derive(Debug)]
 pub struct TextMarkup<'s> {
     pub source: &'s str,
+    pub children: Vec<Object<'s>>,
 }
 
 #[derive(Debug)]

src/parser/text_markup.rs

@@ -1,10 +1,21 @@
 use nom::branch::alt;
 use nom::bytes::complete::tag;
+use nom::combinator::peek;
+use nom::combinator::verify;
+use nom::multi::many_till;
+use nom::sequence::terminated;
 
 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::standard_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::util::get_one_before;
 use crate::parser::TextMarkup;
 
@@ -15,11 +26,27 @@ pub fn text_markup<'r, 's>(
 ) -> Res<&'s str, TextMarkup<'s>> {
     let (remaining, _) = pre(context, input)?;
     let (remaining, open) = marker(remaining)?;
-    return Err(nom::Err::Error(CustomError::MyError(MyError(
-        "text markup not implemented yet.",
-    ))));
+    let text_markup_end_specialized = text_markup_end(open);
+    let parser_context =
+        context.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
+            class: ExitClass::Beta,
+            exit_matcher: &text_markup_end_specialized,
+        }));
 
-    todo!()
+    let (remaining, (children, _exit_contents)) = verify(
+        many_till(
+            parser_with_context!(standard_set_object)(&parser_context),
+            parser_with_context!(exit_matcher_parser)(&parser_context),
+        ),
+        |(children, _exit_contents)| !children.is_empty(),
+    )(remaining)?;
+
+    // TODO: Sometimes its plain text, not objects
+    let (remaining, close) = text_markup_end_specialized(context, remaining)?;
+
+    let source = get_consumed(input, remaining);
+
+    Ok((remaining, TextMarkup { source, children }))
 }
 
 #[tracing::instrument(ret, level = "debug")]
@@ -42,7 +69,48 @@ pub fn pre<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, ()>
     Ok((input, ()))
 }
 
+#[tracing::instrument(ret, level = "debug")]
+pub fn post<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, ()> {
+    let document_root = context.get_document_root().unwrap();
+    let preceding_character = get_one_before(document_root, input)
+        .map(|slice| slice.chars().next())
+        .flatten();
+    match preceding_character {
+        // If None, we are at the start of the file which is technically the beginning of a line.
+        None | Some('\r') | Some('\n') | Some(' ') | Some('\t') | Some('-') | Some('(')
+        | Some('{') | Some('\'') | Some('"') => {}
+        Some(_) => {
+            // Not at start of line, cannot be a heading
+            return Err(nom::Err::Error(CustomError::MyError(MyError(
+                "Not a valid pre character for text markup.",
+            ))));
+        }
+    };
+    Ok((input, ()))
+}
+
 #[tracing::instrument(ret, level = "debug")]
 pub fn marker(input: &str) -> Res<&str, &str> {
     alt((tag("*"), tag("/"), tag("_"), tag("="), tag("~"), tag("+")))(input)
 }
+
+fn text_markup_end(
+    marker_symbol: &str,
+) -> impl for<'r, 's> Fn(Context<'r, 's>, &'s str) -> Res<&'s str, &'s str> {
+    let marker_symbol = marker_symbol.to_owned();
+    move |context: Context, input: &str| _text_markup_end(context, input, marker_symbol.as_str())
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn _text_markup_end<'r, 's, 'x>(
+    context: Context<'r, 's>,
+    input: &'s str,
+    marker_symbol: &'x str,
+) -> Res<&'s str, &'s str> {
+    let (remaining, _marker) = terminated(
+        tag(marker_symbol),
+        peek(parser_with_context!(post)(context)),
+    )(input)?;
+    let source = get_consumed(input, remaining);
+    Ok((remaining, source))
+}

toy_language.txt

@@ -1,35 +1 @@
-prologue *goes here* I guess *bold
-text*
-
-bold*wont* start *or stop*when there is text outside it
-
-I guess *regular
-
-text*
-
-[foo *bar] baz* car
-
-
-*nesting *bold entrances* and* exits
-
-* Heading
-
-body of heading
-
-** Child heading
-** Immediate second child heading
-
-* Second top-level heading
-foo bar
-1. This is a list immediately after a paragraph
-2. This is a second item in the list
-  1. This is a child of the second item
-#+begin_center
-1. foo
-2. bar
-#+end_center
-[fn:1] A footnote.
-
-[fn:2] A multi-
-
-line footnote.
+foo *bar* baz