Implement the statistics cookie parser.

org_mode_samples/statistics_cookie/simple.org

@@ -0,0 +1,3 @@
+[70%]
+[3/5]
+[-3/5]

src/parser/object_parser.rs

@@ -21,6 +21,7 @@ use crate::parser::org_macro::org_macro;
 use crate::parser::plain_link::plain_link;
 use crate::parser::radio_link::radio_link;
 use crate::parser::radio_link::radio_target;
+use crate::parser::statistics_cookie::statistics_cookie;
 use crate::parser::target::target;
 use crate::parser::text_markup::text_markup;
 
@@ -29,10 +30,14 @@ pub fn standard_set_object<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, Object<'s>> {
-    // TODO: line breaks, targets (different from radio targets), statistics cookies, subscript and superscript, timestamps.
+    // TODO: subscript and superscript, timestamps.
     not(|i| context.check_exit_matcher(i))(input)?;
 
     alt((
+        map(
+            parser_with_context!(statistics_cookie)(context),
+            Object::StatisticsCookie,
+        ),
         map(parser_with_context!(target)(context), Object::Target),
         map(parser_with_context!(line_break)(context), Object::LineBreak),
         map(
@@ -100,6 +105,10 @@ pub fn any_object_except_plain_text<'r, 's>(
 ) -> Res<&'s str, Object<'s>> {
     // Used for exit matchers so this does not check exit matcher condition.
     alt((
+        map(
+            parser_with_context!(statistics_cookie)(context),
+            Object::StatisticsCookie,
+        ),
         map(parser_with_context!(target)(context), Object::Target),
         map(parser_with_context!(line_break)(context), Object::LineBreak),
         map(
@@ -145,8 +154,12 @@ pub fn regular_link_description_object_set<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, Object<'s>> {
-    // TODO: minimal set of objects as well as export snippets, and statistics cookies. It can also contain another link, but only when it is a plain or angle link. It can contain square brackets, but not ]]
+    // TODO: add export snippets. It can also contain another link, but only when it is a plain or angle link. It can contain square brackets, but not ]]
     alt((
+        map(
+            parser_with_context!(statistics_cookie)(context),
+            Object::StatisticsCookie,
+        ),
         map(
             parser_with_context!(inline_source_block)(context),
             Object::InlineSourceBlock,

src/parser/statistics_cookie.rs

@@ -1,6 +1,12 @@
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::character::complete::space0;
+use nom::combinator::recognize;
+use nom::sequence::tuple;
+
 use super::Context;
 use crate::error::Res;
-use crate::parser::util::not_yet_implemented;
+use crate::parser::parser_with_context::parser_with_context;
 use crate::parser::StatisticsCookie;
 
 #[tracing::instrument(ret, level = "debug")]
@@ -8,6 +14,35 @@ pub fn statistics_cookie<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, StatisticsCookie<'s>> {
-    not_yet_implemented()?;
-    todo!()
+    alt((
+        parser_with_context!(percent_statistics_cookie)(context),
+        parser_with_context!(fraction_statistics_cookie)(context),
+    ))(input)
+}
+
+#[tracing::instrument(ret, level = "debug")]
+pub fn percent_statistics_cookie<'r, 's>(
+    context: Context<'r, 's>,
+    input: &'s str,
+) -> Res<&'s str, StatisticsCookie<'s>> {
+    let (remaining, source) =
+        recognize(tuple((tag("["), nom::character::complete::u64, tag("%]"))))(input)?;
+    let (remaining, _) = space0(remaining)?;
+    Ok((remaining, StatisticsCookie { source }))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+pub fn fraction_statistics_cookie<'r, 's>(
+    context: Context<'r, 's>,
+    input: &'s str,
+) -> Res<&'s str, StatisticsCookie<'s>> {
+    let (remaining, source) = recognize(tuple((
+        tag("["),
+        nom::character::complete::u64,
+        tag("/"),
+        nom::character::complete::u64,
+        tag("]"),
+    )))(input)?;
+    let (remaining, _) = space0(remaining)?;
+    Ok((remaining, StatisticsCookie { source }))
 }