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-rw-r--r--support/texlab/crates/bibtex-utils/src/field/date.rs85
1 files changed, 85 insertions, 0 deletions
diff --git a/support/texlab/crates/bibtex-utils/src/field/date.rs b/support/texlab/crates/bibtex-utils/src/field/date.rs
new file mode 100644
index 0000000000..8e2c0b7d72
--- /dev/null
+++ b/support/texlab/crates/bibtex-utils/src/field/date.rs
@@ -0,0 +1,85 @@
+use std::{fmt, ops::Add, str::FromStr};
+
+use chrono::{Datelike, Month, NaiveDate};
+use syntax::bibtex::Value;
+
+use super::text::TextFieldData;
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Hash)]
+pub enum DateField {
+ Date,
+ EventDate,
+ Month,
+ UrlDate,
+ Year,
+}
+
+impl DateField {
+ pub fn parse(input: &str) -> Option<Self> {
+ Some(match input.to_ascii_lowercase().as_str() {
+ "date" => Self::Date,
+ "eventdate" => Self::EventDate,
+ "month" => Self::Month,
+ "urldate" => Self::UrlDate,
+ "year" => Self::Year,
+ _ => return None,
+ })
+ }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Hash)]
+pub enum DateFieldData {
+ Date(NaiveDate),
+ Year(i32),
+ Month(Month),
+ Other(String),
+}
+
+impl Add for DateFieldData {
+ type Output = Self;
+
+ fn add(self, rhs: Self) -> Self::Output {
+ match (self, rhs) {
+ (date @ Self::Year(_), Self::Year(_))
+ | (date @ Self::Month(_), Self::Month(_))
+ | (date @ Self::Date(_), Self::Date(_))
+ | (Self::Other(_), date)
+ | (date, Self::Other(_)) => date,
+ (Self::Year(year), Self::Month(month)) | (Self::Month(month), Self::Year(year)) => {
+ let new_date = NaiveDate::from_ymd_opt(year, month.number_from_month(), 1).unwrap();
+ Self::Date(new_date)
+ }
+ (Self::Year(year), Self::Date(date)) | (Self::Date(date), Self::Year(year)) => {
+ let new_date = date.with_year(year).unwrap_or(date);
+ Self::Date(new_date)
+ }
+ (Self::Date(date), Self::Month(month)) | (Self::Month(month), Self::Date(date)) => {
+ let new_date = date.with_month(month.number_from_month()).unwrap_or(date);
+ Self::Date(new_date)
+ }
+ }
+ }
+}
+
+impl fmt::Display for DateFieldData {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ Self::Year(year) => write!(f, "{}", year),
+ Self::Date(date) => write!(f, "{}", date.format("%b. %Y")),
+ Self::Month(month) => write!(f, "{}", month.name()),
+ Self::Other(text) => write!(f, "{}", text),
+ }
+ }
+}
+
+impl DateFieldData {
+ pub fn parse(value: &Value) -> Option<Self> {
+ let TextFieldData { text } = TextFieldData::parse(value)?;
+ NaiveDate::from_str(&text)
+ .ok()
+ .map(Self::Date)
+ .or_else(|| text.parse().ok().map(Self::Year))
+ .or_else(|| text.parse().ok().map(Self::Month))
+ .or(Some(Self::Other(text)))
+ }
+}