Add a lot of the date parsing

go-sgf/src/date.rs

@@ -0,0 +1,147 @@
+use chrono::{Datelike, NaiveDate};
+use std::num::ParseIntError;
+use thiserror::Error;
+
+#[derive(Debug, Error, PartialEq)]
+pub enum Error {
+    #[error("Failed to parse integer {0}")]
+    ParseNumberError(ParseIntError),
+
+    #[error("Invalid date")]
+    InvalidDate,
+
+    #[error("unsupported date format")]
+    Unsupported,
+}
+
+#[derive(Clone, Debug, PartialEq, PartialOrd)]
+pub enum Date {
+    Year(i32),
+    YearMonth(i32, u32),
+    Date(chrono::NaiveDate),
+}
+
+/*
+impl TryFrom<&str> for Date {
+    type Error = String;
+    fn try_from(s: &str) -> Result<Date, Self::Error> {
+        let date_parts = s.split("-").collect::<Vec<&str>>();
+
+        if date_parts.len() >= 1 {
+            let year = date_parts[0]
+                .parse::<i32>()
+                .map_err(|e| format!("{:?}", e))?;
+
+            if date_parts.len() >= 2 {
+                let month = date_parts[1]
+                    .parse::<u32>()
+                    .map_err(|e| format!("{:?}", e))?;
+
+                if date_parts.len() >= 3 {
+                    let day = date_parts[2]
+                        .parse::<u32>()
+                        .map_err(|e| format!("{:?}", e))?;
+                    let date =
+                        chrono::NaiveDate::from_ymd_opt(year, month, day).ok_or("invalid date")?;
+                    Ok(Date::Date(date))
+                } else {
+                    Ok(Date::YearMonth(year, month))
+                }
+            } else {
+                Ok(Date::Year(year))
+            }
+        } else {
+            return Err("no elements".to_owned());
+        }
+    }
+}
+*/
+
+fn parse_numbers(s: &str) -> Result<Vec<i32>, Error> {
+    s.split("-")
+        .map(|s| s.parse::<i32>().map_err(|err| Error::ParseNumberError(err)))
+        .collect::<Result<Vec<i32>, Error>>()
+}
+
+fn parse_date_field(s: &str) -> Result<Vec<Date>, Error> {
+    let date_elements = s.split(",");
+    let mut dates = Vec::new();
+
+    let mut most_recent: Option<Date> = None;
+    for element in date_elements {
+        let fields = parse_numbers(element)?;
+
+        let new_date = match fields.as_slice() {
+            [] => panic!("all segments must have a field"),
+            [v1] => match most_recent {
+                Some(Date::Year(_)) => Date::Year(*v1),
+                Some(Date::YearMonth(y, _)) => Date::YearMonth(y, *v1 as u32),
+                Some(Date::Date(d)) => {
+                    Date::Date(d.clone().with_day(*v1 as u32).ok_or(Error::InvalidDate)?)
+                }
+
+                None => Date::Year(*v1),
+            },
+            [v1, v2] => Date::YearMonth(*v1, *v2 as u32),
+            [v1, v2, v3, ..] => Date::Date(
+                NaiveDate::from_ymd_opt(v1.clone(), v2.clone() as u32, v3.clone() as u32).unwrap(),
+            ),
+        };
+        dates.push(new_date.clone());
+        most_recent = Some(new_date);
+    }
+
+    Ok(dates)
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn it_parses_a_year() {
+        assert_eq!(parse_date_field("1996"), Ok(vec![Date::Year(1996)]));
+    }
+
+    #[test]
+    fn it_parses_a_month() {
+        assert_eq!(
+            parse_date_field("1996-12"),
+            Ok(vec![Date::YearMonth(1996, 12)])
+        );
+    }
+
+    #[test]
+    fn it_parses_a_date() {
+        assert_eq!(
+            parse_date_field("1996-12-27"),
+            Ok(vec![Date::Date(
+                NaiveDate::from_ymd_opt(1996, 12, 27).unwrap()
+            )])
+        );
+    }
+
+    #[test]
+    fn it_parses_date_continuation() {
+        assert_eq!(
+            parse_date_field("1996-12-27,28"),
+            Ok(vec![
+                Date::Date(NaiveDate::from_ymd_opt(1996, 12, 27).unwrap()),
+                Date::Date(NaiveDate::from_ymd_opt(1996, 12, 28).unwrap())
+            ])
+        );
+    }
+
+    #[test]
+    fn it_parses_date_crossing_year_boundary() {
+        assert_eq!(
+            parse_date_field("1996-12-27,28,1997-01-03,04"),
+            Ok(vec![
+                Date::Date(NaiveDate::from_ymd_opt(1996, 12, 27).unwrap()),
+                Date::Date(NaiveDate::from_ymd_opt(1996, 12, 28).unwrap()),
+                Date::Date(NaiveDate::from_ymd_opt(1997, 1, 3).unwrap()),
+                Date::Date(NaiveDate::from_ymd_opt(1997, 1, 4).unwrap()),
+            ])
+        );
+    }
+}

go-sgf/src/go.rs

@@ -68,8 +68,10 @@
 //  PM
 //  VW
 
-use crate::tree::{parse_collection, parse_size, ParseSizeError, Size};
-use nom::IResult;
+use crate::{
+    date::Date,
+    tree::{parse_collection, ParseSizeError, Size},
+};
 
 #[derive(Debug)]
 pub enum Error<'a> {
@@ -133,7 +135,7 @@ pub struct GameInfo {
     pub event: Option<String>,
     // Games can be played across multiple days, even multiple years. The format specifies
     // shortcuts.
-    pub date: Vec<chrono::NaiveDate>,
+    pub date: Vec<Date>,
     pub location: Option<String>,
     // special rules for the round-number and type
     pub round: Option<String>,
@@ -209,6 +211,7 @@ pub enum GameType {
     Unsupported,
 }
 
+/*
 enum PropType {
     Move,
     Setup,
@@ -228,9 +231,10 @@ enum PropValue {
     Move,
     Stone,
 }
+*/
 
 pub fn parse_sgf<'a>(input: &'a str) -> Result<Vec<GameTree>, Error<'a>> {
-    let (input, trees) = parse_collection::<nom::error::VerboseError<&'a str>>(input)?;
+    let (_, trees) = parse_collection::<nom::error::VerboseError<&'a str>>(input)?;
 
     let games = trees
         .into_iter()
@@ -290,7 +294,7 @@ pub fn parse_sgf<'a>(input: &'a str) -> Result<Vec<GameTree>, Error<'a>> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::tree::Size;
+    use crate::{date::Date, tree::Size};
     use std::fs::File;
     use std::io::Read;
 
@@ -362,8 +366,8 @@ mod tests {
             assert_eq!(
                 tree.info.date,
                 vec![
-                    chrono::NaiveDate::from_ymd_opt(1996, 10, 18).unwrap(),
-                    chrono::NaiveDate::from_ymd_opt(1996, 10, 19).unwrap(),
+                    Date::Date(chrono::NaiveDate::from_ymd_opt(1996, 10, 18).unwrap()),
+                    Date::Date(chrono::NaiveDate::from_ymd_opt(1996, 10, 19).unwrap()),
                 ]
             );
             assert_eq!(tree.info.event, Some("21st Meijin".to_owned()));

go-sgf/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod date;
 pub mod go;
 pub mod tree;