Always match the entire entity name.

This fixes an issue where lines in a paragraph were incorrectly getting identified as lists because I had defaulted to assuming alphabetical bullets were allowed.

notes/optimization_ideas.org

@@ -25,3 +25,4 @@ This could significantly reduce our calls to exit matchers.
 I think targets would break this.
 
 The exit matchers are already implicitly building this behavior since they should all exit very early when the starting character is wrong. Putting this logic in a centralized place, far away from where those characters are actually going to be used, is unfortunate for readability.
+** Use exit matcher to cut off trailing whitespace instead of re-matching in plain lists.

org_mode_samples/object/radio_link/different_case.org

@@ -0,0 +1,3 @@
+<<<Foo Bar Baz>>>
+
+foo bar baz

org_mode_samples/object/radio_link/different_whitespace.org

@@ -0,0 +1,6 @@
+<<<foo bar baz>>>
+
+
+foo
+bar
+baz

org_mode_samples/object/regular_link/elisp.org

@@ -0,0 +1 @@
+[[elisp:(local-set-key "\M-\x" 'foo-bar-baz)]]

org_mode_samples/sections_and_headings/empty_heading.org

@@ -0,0 +1,2 @@
+* DONE
+* 

org_mode_samples/sections_and_headings/fast_access_todo_states.org

@@ -0,0 +1,6 @@
+#+TODO: TODO(t) INPROGRESS(i/!) | DONE(d!) CANCELED(c@/!)
+# !  : Log changes leading to this state.
+# @  : Log changes leading to this state and prompt for a comment to include.
+# /! : Log changes leaving this state if and only if to a state that does not log. This can be combined with the above like WAIT(w!/!) or DELAYED(d@/!)
+* INPROGRESS
+- State "TODO"       from "INPROGRESS" [2023-09-14 Thu 02:13]

src/compare/diff.rs

@@ -546,14 +546,26 @@ fn compare_heading<'s>(
     };
 
     // Compare title
-    let title = get_property(emacs, ":title")?.ok_or("Missing :title attribute.")?;
+    let title = get_property(emacs, ":title")?;
-    let title_status = title
+    match (title, rust.title.len()) {
-        .as_list()?
+        (None, 0) => {}
-        .iter()
+        (None, _) => {
-        .zip(rust.title.iter())
+            this_status = DiffStatus::Bad;
-        .map(|(emacs_child, rust_child)| compare_object(source, emacs_child, rust_child))
+            message = Some(format!(
-        .collect::<Result<Vec<_>, _>>()?;
+                "Titles do not match (emacs != rust): {:?} != {:?}",
-    child_status.push(artificial_diff_scope("title".to_owned(), title_status)?);
+                title, rust.title
+            ))
+        }
+        (Some(title), _) => {
+            let title_status = title
+                .as_list()?
+                .iter()
+                .zip(rust.title.iter())
+                .map(|(emacs_child, rust_child)| compare_object(source, emacs_child, rust_child))
+                .collect::<Result<Vec<_>, _>>()?;
+            child_status.push(artificial_diff_scope("title".to_owned(), title_status)?);
+        }
+    };
 
     // Compare priority
     let priority = get_property(emacs, ":priority")?;
@@ -1914,6 +1926,8 @@ fn compare_regular_link<'s>(
         Ok(_) => {}
     };
 
+    // TODO: Compare :type :path :format :raw-link :application :search-option
+
     Ok(DiffResult {
         status: this_status,
         name: emacs_name.to_owned(),

src/context/global_settings.rs

@@ -12,6 +12,10 @@ pub struct GlobalSettings<'g, 's> {
     pub file_access: &'g dyn FileAccessInterface,
     pub in_progress_todo_keywords: BTreeSet<String>,
     pub complete_todo_keywords: BTreeSet<String>,
+    /// Set to true to allow for plain lists using single letters as the bullet in the same way that numbers are used.
+    ///
+    /// Corresponds to the org-list-allow-alphabetical elisp variable.
+    pub org_list_allow_alphabetical: bool,
 }
 
 impl<'g, 's> GlobalSettings<'g, 's> {
@@ -23,6 +27,7 @@ impl<'g, 's> GlobalSettings<'g, 's> {
             },
             in_progress_todo_keywords: BTreeSet::new(),
             complete_todo_keywords: BTreeSet::new(),
+            org_list_allow_alphabetical: false,
         }
     }
 }

src/parser/element_parser.rs

@@ -141,7 +141,7 @@ fn _detect_element<'b, 'g, 'r, 's>(
     can_be_paragraph: bool,
 ) -> Res<OrgSource<'s>, ()> {
     if alt((
-        detect_plain_list,
+        parser_with_context!(detect_plain_list)(context),
         detect_footnote_definition,
         detect_diary_sexp,
         detect_comment,

src/parser/entity.rs

@@ -1,10 +1,10 @@
 use nom::branch::alt;
 use nom::bytes::complete::tag;
-use nom::bytes::complete::tag_no_case;
 use nom::character::complete::satisfy;
 use nom::combinator::eof;
 use nom::combinator::peek;
 use nom::combinator::recognize;
+use nom::sequence::tuple;
 
 use super::org_source::OrgSource;
 use super::util::maybe_consume_object_trailing_whitespace_if_not_exiting;
@@ -439,7 +439,7 @@ pub(crate) fn entity<'b, 'g, 'r, 's>(
 ) -> Res<OrgSource<'s>, Entity<'s>> {
     let (remaining, _) = tag("\\")(input)?;
     let (remaining, entity_name) = name(context, remaining)?;
-    let (remaining, _) = alt((tag("{}"), peek(recognize(entity_end))))(remaining)?;
+
     let (remaining, _trailing_whitespace) =
         maybe_consume_object_trailing_whitespace_if_not_exiting(context, remaining)?;
 
@@ -460,9 +460,12 @@ fn name<'b, 'g, 'r, 's>(
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
     // TODO: This should be defined by org-entities and optionally org-entities-user
     for entity in ORG_ENTITIES {
-        let result = tag_no_case::<_, _, CustomError<_>>(entity)(input);
+        let result = tuple((
+            tag::<_, _, CustomError<_>>(entity),
+            alt((tag("{}"), peek(recognize(entity_end)))),
+        ))(input);
         match result {
-            Ok((remaining, ent)) => {
+            Ok((remaining, (ent, _))) => {
                 return Ok((remaining, ent));
             }
             Err(_) => {}

src/parser/fixed_width_area.rs

@@ -3,15 +3,17 @@ use nom::bytes::complete::is_not;
 use nom::bytes::complete::tag;
 use nom::character::complete::line_ending;
 use nom::character::complete::space0;
-use nom::character::complete::space1;
 use nom::combinator::eof;
 use nom::combinator::not;
-use nom::combinator::opt;
+use nom::combinator::recognize;
 use nom::multi::many0;
 use nom::sequence::preceded;
 use nom::sequence::tuple;
 
 use super::org_source::OrgSource;
+use super::util::org_line_ending;
+use super::util::org_spaces0;
+use super::util::org_spaces1;
 use crate::context::parser_with_context;
 use crate::context::RefContext;
 use crate::error::Res;
@@ -47,10 +49,10 @@ fn fixed_width_area_line<'b, 'g, 'r, 's>(
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
     start_of_line(input)?;
     let (remaining, _indent) = space0(input)?;
-    let (remaining, (_colon, _leading_whitespace_and_content, _line_ending)) = tuple((
+    let (remaining, _) = tuple((
         tag(":"),
-        opt(tuple((space1, is_not("\r\n")))),
+        alt((recognize(tuple((org_spaces1, is_not("\r\n")))), org_spaces0)),
-        alt((line_ending, eof)),
+        org_line_ending,
     ))(remaining)?;
     let source = get_consumed(input, remaining);
     Ok((remaining, source))

src/parser/headline.rs

@@ -1,13 +1,11 @@
 use nom::branch::alt;
 use nom::bytes::complete::tag;
 use nom::character::complete::anychar;
-use nom::character::complete::line_ending;
-use nom::character::complete::space0;
 use nom::character::complete::space1;
-use nom::combinator::eof;
 use nom::combinator::map;
 use nom::combinator::not;
 use nom::combinator::opt;
+use nom::combinator::peek;
 use nom::combinator::recognize;
 use nom::combinator::verify;
 use nom::multi::many0;
@@ -19,6 +17,11 @@ use nom::sequence::tuple;
 use super::org_source::OrgSource;
 use super::section::section;
 use super::util::get_consumed;
+use super::util::org_line_ending;
+use super::util::org_space;
+use super::util::org_space_or_line_ending;
+use super::util::org_spaces0;
+use super::util::org_spaces1;
 use super::util::start_of_line;
 use crate::context::parser_with_context;
 use crate::context::ContextElement;
@@ -81,10 +84,10 @@ fn _heading<'b, 'g, 'r, 's>(
         Heading {
             source: source.into(),
             stars: star_count,
-            todo_keyword: maybe_todo_keyword.map(|((todo_keyword_type, todo_keyword), _ws)| {
+            todo_keyword: maybe_todo_keyword.map(|(todo_keyword_type, todo_keyword)| {
                 (todo_keyword_type, Into::<&str>::into(todo_keyword))
             }),
-            priority_cookie: maybe_priority.map(|(priority, _)| priority),
+            priority_cookie: maybe_priority.map(|(_, priority)| priority),
             title,
             tags: heading_tags,
             children,
@@ -109,9 +112,9 @@ fn headline<'b, 'g, 'r, 's>(
     OrgSource<'s>,
     (
         usize,
-        Option<((TodoKeywordType, OrgSource<'s>), OrgSource<'s>)>,
+        Option<(TodoKeywordType, OrgSource<'s>)>,
-        Option<(PriorityCookie, OrgSource<'s>)>,
+        Option<(OrgSource<'s>, PriorityCookie)>,
-        Option<(OrgSource<'s>, OrgSource<'s>)>,
+        Option<OrgSource<'s>>,
         Vec<Object<'s>>,
         Vec<&'s str>,
     ),
@@ -122,45 +125,45 @@ fn headline<'b, 'g, 'r, 's>(
     });
     let parser_context = context.with_additional_node(&parser_context);
 
-    let (
+    let (remaining, (_, star_count, _)) = tuple((
-        remaining,
-        (
-            _,
-            star_count,
-            _,
-            maybe_todo_keyword,
-            maybe_priority,
-            maybe_comment,
-            title,
-            maybe_tags,
-            _,
-            _,
-        ),
-    ) = tuple((
         start_of_line,
         verify(many1_count(tag("*")), |star_count| {
             *star_count > parent_stars
         }),
-        space1,
+        peek(org_space),
-        opt(tuple((
-            parser_with_context!(heading_keyword)(&parser_context),
-            space1,
-        ))),
-        opt(tuple((priority_cookie, space1))),
-        opt(tuple((tag("COMMENT"), space1))),
-        many1(parser_with_context!(standard_set_object)(&parser_context)),
-        opt(tuple((space0, tags))),
-        space0,
-        alt((line_ending, eof)),
     ))(input)?;
+
+    let (remaining, maybe_todo_keyword) = opt(tuple((
+        org_spaces1,
+        parser_with_context!(heading_keyword)(&parser_context),
+        peek(org_space_or_line_ending),
+    )))(remaining)?;
+
+    let (remaining, maybe_priority) = opt(tuple((org_spaces1, priority_cookie)))(remaining)?;
+
+    let (remaining, maybe_comment) = opt(tuple((
+        org_spaces1,
+        tag("COMMENT"),
+        peek(org_space_or_line_ending),
+    )))(remaining)?;
+
+    let (remaining, maybe_title) = opt(tuple((
+        org_spaces1,
+        many1(parser_with_context!(standard_set_object)(&parser_context)),
+    )))(remaining)?;
+
+    let (remaining, maybe_tags) = opt(tuple((org_spaces0, tags)))(remaining)?;
+
+    let (remaining, _) = tuple((org_spaces0, org_line_ending))(remaining)?;
+
     Ok((
         remaining,
         (
             star_count,
-            maybe_todo_keyword,
+            maybe_todo_keyword.map(|(_, todo, _)| todo),
             maybe_priority,
-            maybe_comment,
+            maybe_comment.map(|(_, comment, _)| comment),
-            title,
+            maybe_title.map(|(_, title)| title).unwrap_or(Vec::new()),
             maybe_tags
                 .map(|(_ws, tags)| {
                     tags.into_iter()
@@ -178,8 +181,9 @@ fn headline_title_end<'b, 'g, 'r, 's>(
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
     recognize(tuple((
-        opt(tuple((space0, tags, space0))),
+        org_spaces0,
-        alt((line_ending, eof)),
+        opt(tuple((tags, org_spaces0))),
+        org_line_ending,
     )))(input)
 }
 

src/parser/keyword_todo.rs

@@ -44,9 +44,17 @@ pub(crate) fn todo_keywords<'s>(input: &'s str) -> Res<&'s str, (Vec<&'s str>, V
 }
 
 fn todo_keyword_word<'s>(input: &'s str) -> Res<&'s str, &'s str> {
-    verify(take_till(|c| " \t\r\n|".contains(c)), |result: &str| {
+    let (remaining, keyword) = verify(take_till(|c| "( \t\r\n|".contains(c)), |result: &str| {
         !result.is_empty()
-    })(input)
+    })(input)?;
+
+    let (remaining, _) = opt(tuple((
+        tag("("),
+        take_till(|c| "() \t\r\n|".contains(c)),
+        tag(")"),
+    )))(remaining)?;
+
+    Ok((remaining, keyword))
 }
 #[cfg(test)]
 mod tests {

src/parser/plain_list.rs

@@ -41,12 +41,15 @@ use crate::types::PlainList;
 use crate::types::PlainListItem;
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
-pub(crate) fn detect_plain_list<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, ()> {
+pub(crate) fn detect_plain_list<'b, 'g, 'r, 's>(
+    context: RefContext<'b, 'g, 'r, 's>,
+    input: OrgSource<'s>,
+) -> Res<OrgSource<'s>, ()> {
     if verify(
         tuple((
             start_of_line,
             space0,
-            bullet,
+            parser_with_context!(bullet)(context),
             alt((space1, line_ending, eof)),
         )),
         |(_start, indent, bull, _after_whitespace)| {
@@ -145,12 +148,17 @@ fn plain_list_item<'b, 'g, 'r, 's>(
     let (remaining, leading_whitespace) = space0(input)?;
     // It is fine that we get the indent level using the number of bytes rather than the number of characters because nom's space0 only matches space and tab (0x20 and 0x09)
     let indent_level = leading_whitespace.len();
-    let (remaining, bull) = verify(bullet, |bull: &OrgSource<'_>| {
+    let (remaining, bull) = verify(
-        Into::<&str>::into(bull) != "*" || indent_level > 0
+        parser_with_context!(bullet)(context),
-    })(remaining)?;
+        |bull: &OrgSource<'_>| Into::<&str>::into(bull) != "*" || indent_level > 0,
+    )(remaining)?;
 
-    let (remaining, _maybe_counter_set) =
+    let (remaining, _maybe_counter_set) = opt(tuple((
-        opt(tuple((space1, tag("[@"), counter, tag("]"))))(remaining)?;
+        space1,
+        tag("[@"),
+        parser_with_context!(counter)(context),
+        tag("]"),
+    )))(remaining)?;
 
     // TODO: parse checkbox
 
@@ -228,18 +236,36 @@ fn plain_list_item<'b, 'g, 'r, 's>(
 }
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
-fn bullet<'s>(i: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
+fn bullet<'b, 'g, 'r, 's>(
+    context: RefContext<'b, 'g, 'r, 's>,
+    input: OrgSource<'s>,
+) -> Res<OrgSource<'s>, OrgSource<'s>> {
     alt((
         tag("*"),
         tag("-"),
         tag("+"),
-        recognize(tuple((counter, alt((tag("."), tag(")")))))),
+        recognize(tuple((
-    ))(i)
+            parser_with_context!(counter)(context),
+            alt((tag("."), tag(")"))),
+        ))),
+    ))(input)
 }
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
-fn counter<'s>(i: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
+fn counter<'b, 'g, 'r, 's>(
-    alt((recognize(one_of("abcdefghijklmnopqrstuvwxyz")), digit1))(i)
+    context: RefContext<'b, 'g, 'r, 's>,
+    input: OrgSource<'s>,
+) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    if context.get_global_settings().org_list_allow_alphabetical {
+        alt((
+            recognize(one_of(
+                "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
+            )),
+            digit1,
+        ))(input)
+    } else {
+        digit1(input)
+    }
 }
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
@@ -558,21 +584,30 @@ dolar"#,
             r#"+
 "#,
         );
-        let result = detect_plain_list(input);
+        let global_settings = GlobalSettings::default();
+        let initial_context = ContextElement::document_context();
+        let initial_context = Context::new(&global_settings, List::new(&initial_context));
+        let result = detect_plain_list(&initial_context, input);
         assert!(result.is_ok());
     }
 
     #[test]
     fn detect_eof() {
         let input = OrgSource::new(r#"+"#);
-        let result = detect_plain_list(input);
+        let global_settings = GlobalSettings::default();
+        let initial_context = ContextElement::document_context();
+        let initial_context = Context::new(&global_settings, List::new(&initial_context));
+        let result = detect_plain_list(&initial_context, input);
         assert!(result.is_ok());
     }
 
     #[test]
     fn detect_no_gap() {
         let input = OrgSource::new(r#"+foo"#);
-        let result = detect_plain_list(input);
+        let global_settings = GlobalSettings::default();
+        let initial_context = ContextElement::document_context();
+        let initial_context = Context::new(&global_settings, List::new(&initial_context));
+        let result = detect_plain_list(&initial_context, input);
         // Since there is no whitespace after the '+' this is a paragraph, not a plain list.
         assert!(result.is_err());
     }
@@ -580,7 +615,10 @@ dolar"#,
     #[test]
     fn detect_with_gap() {
         let input = OrgSource::new(r#"+ foo"#);
-        let result = detect_plain_list(input);
+        let global_settings = GlobalSettings::default();
+        let initial_context = ContextElement::document_context();
+        let initial_context = Context::new(&global_settings, List::new(&initial_context));
+        let result = detect_plain_list(&initial_context, input);
         assert!(result.is_ok());
     }
 }

src/parser/plain_text.rs

@@ -1,17 +1,24 @@
 use nom::branch::alt;
-use nom::bytes::complete::tag;
+use nom::bytes::complete::is_not;
+use nom::bytes::complete::tag_no_case;
 use nom::character::complete::anychar;
-use nom::combinator::map;
+use nom::character::complete::line_ending;
+use nom::character::complete::one_of;
 use nom::combinator::peek;
 use nom::combinator::recognize;
 use nom::combinator::verify;
+use nom::multi::many1;
 use nom::multi::many_till;
 
 use super::org_source::OrgSource;
 use super::radio_link::RematchObject;
 use super::util::exit_matcher_parser;
+use super::util::get_consumed;
+use super::util::org_space_or_line_ending;
 use crate::context::parser_with_context;
 use crate::context::RefContext;
+use crate::error::CustomError;
+use crate::error::MyError;
 use crate::error::Res;
 use crate::types::Object;
 use crate::types::PlainText;
@@ -72,11 +79,52 @@ impl<'x> RematchObject<'x> for PlainText<'x> {
         _context: RefContext<'b, 'g, 'r, 's>,
         input: OrgSource<'s>,
     ) -> Res<OrgSource<'s>, Object<'s>> {
-        map(tag(self.source), |s| {
+        let mut remaining = input;
+        let mut goal = self.source;
+
+        loop {
+            if goal.is_empty() {
+                break;
+            }
+
+            // let is_whitespace = recognize(many1(org_space_or_line_ending))(input);
+            let is_not_whitespace = is_not::<&str, &str, CustomError<_>>(" \t\r\n")(goal);
+            match is_not_whitespace {
+                Ok((new_goal, payload)) => {
+                    let (new_remaining, _) = tag_no_case(payload)(remaining)?;
+                    remaining = new_remaining;
+                    goal = new_goal;
+                    continue;
+                }
+                Err(_) => {}
+            };
+
+            let is_whitespace = recognize(many1(alt((
+                recognize(one_of::<&str, &str, CustomError<_>>(" \t")),
+                line_ending,
+            ))))(goal);
+            match is_whitespace {
+                Ok((new_goal, _)) => {
+                    let (new_remaining, _) = many1(org_space_or_line_ending)(remaining)?;
+                    remaining = new_remaining;
+                    goal = new_goal;
+                    continue;
+                }
+                Err(_) => {}
+            };
+
+            return Err(nom::Err::Error(CustomError::MyError(MyError(
+                "Target does not match.".into(),
+            ))));
+        }
+
+        let source = get_consumed(input, remaining);
+        Ok((
+            remaining,
             Object::PlainText(PlainText {
-                source: Into::<&str>::into(s),
+                source: Into::<&str>::into(source),
-            })
+            }),
-        })(input)
+        ))
     }
 }
 

src/parser/regular_link.rs

@@ -2,7 +2,7 @@ use nom::branch::alt;
 use nom::bytes::complete::escaped;
 use nom::bytes::complete::tag;
 use nom::bytes::complete::take_till1;
-use nom::character::complete::one_of;
+use nom::character::complete::anychar;
 use nom::combinator::verify;
 use nom::multi::many_till;
 
@@ -82,7 +82,7 @@ fn pathreg<'b, 'g, 'r, 's>(
             _ => false,
         }),
         '\\',
-        one_of(r#"]"#),
+        anychar,
     )(input)?;
     Ok((remaining, path))
 }

src/parser/util.rs

@@ -1,4 +1,5 @@
 use nom::branch::alt;
+use nom::bytes::complete::is_a;
 use nom::character::complete::anychar;
 use nom::character::complete::line_ending;
 use nom::character::complete::none_of;
@@ -9,9 +10,11 @@ use nom::combinator::not;
 use nom::combinator::opt;
 use nom::combinator::peek;
 use nom::combinator::recognize;
+use nom::combinator::verify;
 use nom::multi::many0;
 use nom::multi::many_till;
 use nom::sequence::tuple;
+use nom::Slice;
 
 use super::org_source::OrgSource;
 use crate::context::parser_with_context;
@@ -212,6 +215,9 @@ fn text_until_eol<'r, 's>(
     Ok(line.trim())
 }
 
+/// Return a tuple of (input, output) from a nom parser.
+///
+/// This is similar to recognize except it returns the input instead of the portion of the input that was consumed.
 pub(crate) fn include_input<'s, F, O>(
     mut inner: F,
 ) -> impl FnMut(OrgSource<'s>) -> Res<OrgSource<'s>, (OrgSource<'s>, O)>
@@ -223,3 +229,44 @@ where
         Ok((remaining, (input, output)))
     }
 }
+
+/// Match single space or tab.
+///
+/// In org-mode syntax, spaces and tabs are interchangeable.
+pub(crate) fn org_space<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, char> {
+    one_of(" \t")(input)
+}
+
+/// Matches a single space, tab, line ending, or end of file.
+///
+/// In org-mode syntax there are often delimiters that could be any whitespace at all or the end of file.
+pub(crate) fn org_space_or_line_ending<'s>(
+    input: OrgSource<'s>,
+) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    alt((recognize(one_of(" \t")), org_line_ending))(input)
+}
+
+/// Match as many spaces and tabs as possible. No minimum match.
+///
+/// In org-mode syntax, spaces and tabs are interchangeable.
+pub(crate) fn org_spaces0<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    let found = is_a(" \t")(input);
+    if found.is_ok() {
+        return found;
+    }
+    Ok((input, input.slice(..0)))
+}
+
+/// Match as many spaces and tabs as possible. Minimum 1 character.
+///
+/// In org-mode syntax, spaces and tabs are interchangeable.
+pub(crate) fn org_spaces1<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    verify(is_a(" \t"), |res: &OrgSource<'_>| res.len() > 0)(input)
+}
+
+/// Match a line break or the end of the file.
+///
+/// In org-mode syntax, the end of the file can serve the same purpose as a line break syntactically.
+pub(crate) fn org_line_ending<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    alt((line_ending, eof))(input)
+}