Implement parser for date.

src/parser/timestamp.rs

@@ -1,11 +1,15 @@
 use nom::branch::alt;
 use nom::bytes::complete::tag;
 use nom::character::complete::anychar;
+use nom::character::complete::digit1;
 use nom::character::complete::one_of;
 use nom::character::complete::space0;
+use nom::character::complete::space1;
+use nom::combinator::opt;
 use nom::combinator::recognize;
 use nom::combinator::verify;
 use nom::multi::many_till;
+use nom::sequence::tuple;
 
 use super::Context;
 use crate::error::Res;
@@ -76,6 +80,8 @@ fn active_timestamp<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, Timestamp<'s>> {
+    let (remaining, _) = tag("<")(input)?;
+    let (remaining, _date) = date(context, remaining)?;
     not_yet_implemented()?;
     todo!()
 }
@@ -124,3 +130,43 @@ fn inactive_time_range_timestamp<'r, 's>(
     not_yet_implemented()?;
     todo!()
 }
+
+#[tracing::instrument(ret, level = "debug")]
+fn date<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    let (remaining, _year) = verify(digit1, |year: &str| year.len() == 4)(input)?;
+    let (remaining, _) = tag("-")(remaining)?;
+    let (remaining, _month) = verify(digit1, |month: &str| month.len() == 2)(remaining)?;
+    let (remaining, _) = tag("-")(remaining)?;
+    let (remaining, _day_of_month) =
+        verify(digit1, |day_of_month: &str| day_of_month.len() == 2)(remaining)?;
+    let (remaining, _dayname) =
+        opt(tuple((space1, parser_with_context!(dayname)(context))))(remaining)?;
+    let source = get_consumed(input, remaining);
+    Ok((remaining, source))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn dayname<'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: &dayname_end,
+        }));
+
+    let (remaining, body) = recognize(verify(
+        many_till(
+            anychar,
+            parser_with_context!(exit_matcher_parser)(&parser_context),
+        ),
+        |(body, _end_contents)| !body.is_empty(),
+    ))(input)?;
+
+    Ok((remaining, body))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn dayname_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    recognize(verify(anychar, |c| {
+        c.is_whitespace() || "+-]>0123456789\n".contains(*c)
+    }))(input)
+}