dates_str/
impls.rs

1#![deny(missing_docs)]
2
3use crate::{DateStr, errors::DateErrors};
4use std::ops::{Add, Sub};
5
6/// Trait for easy DateStr making
7///
8/// Blank implementation
9pub trait Into<DateStr> {
10    /// This function creates a [crate::DateStr] in a to_string() fashion
11    fn to_datestr(&self) -> DateStr;
12
13    /// Try to convert to DateStr using [crate::DateStr::try_from_iso_str] function, which returns a
14    /// Result enum.
15    fn try_to_datestr(&self) -> Result<DateStr, crate::errors::DateErrors>;
16}
17
18/// Implementation of ToDateStr for String
19impl Into<DateStr> for String {
20    fn to_datestr(&self) -> DateStr {
21        DateStr::from_iso_str(self)
22    }
23
24    fn try_to_datestr(&self) -> Result<DateStr, crate::errors::DateErrors> {
25        DateStr::try_from_iso_str(self)
26    }
27}
28
29/// Implementation of ToDateStr for &str
30impl Into<DateStr> for str {
31    fn to_datestr(&self) -> DateStr {
32        DateStr::from_iso_str(self)
33    }
34
35    fn try_to_datestr(&self) -> Result<DateStr, crate::errors::DateErrors> {
36        DateStr::try_from_iso_str(self)
37    }
38}
39
40impl TryFrom<String> for DateStr {
41    type Error = DateErrors;
42
43    fn try_from(value: String) -> Result<Self, Self::Error> {
44        let split: Vec<String> = value.split('-').map(|s| s.to_string()).collect();
45        let year = match split[0].parse::<u64>() {
46            Ok(y) => crate::Year::new(y),
47            Err(_e) => return Err(DateErrors::InvalidParsing(value)),
48        };
49        let month = match split[1].parse::<u8>() {
50            Ok(y) => crate::Month::new(y)?,
51            Err(_e) => return Err(DateErrors::InvalidParsing(value)),
52        };
53        let day = match split[2].parse::<u8>() {
54            Ok(y) => crate::Day::new(y)?,
55            Err(_e) => return Err(DateErrors::InvalidParsing(value)),
56        };
57        Ok(DateStr { year, month, day })
58    }
59}
60
61impl From<DateStr> for String {
62    fn from(value: DateStr) -> Self {
63        value.to_string()
64    }
65}
66
67impl Add for DateStr {
68    type Output = Self;
69    fn add(self, rhs: Self) -> Self::Output {
70        let (day, months_from_day) = self.day + rhs.day;
71        let (months, years) = self.month + rhs.month;
72        let (month, more_years) = months + months_from_day;
73        let year = self.year + rhs.year + years + more_years;
74        DateStr { day, month, year }
75    }
76}
77
78impl Sub for DateStr {
79    type Output = Self;
80    fn sub(self, rhs: Self) -> Self::Output {
81        let (day, months_from_day) = self.day - rhs.day;
82        let (months, years) = self.month - rhs.month;
83        let (month, more_years) = months - months_from_day;
84        let year = self.year - rhs.year - years - more_years;
85        DateStr { day, month, year }
86    }
87}
dates_str/impls.rs

dates_str/
impls.rs
