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|
use chrono::{naive::NaiveDate, Duration};
use crate::transaction::{Category, Transaction};
pub struct Search<'t> {
filtered: Vec<usize>,
transactions: Vec<&'t Transaction>,
}
pub enum DateIsh {
Absolute(NaiveDate),
Relative(Duration),
}
impl DateIsh {
pub fn parse(s: &str) -> Self {
DateIsh::Absolute(NaiveDate::parse_from_str(s, "%Y-%m-%d").unwrap())
}
}
pub enum Constraint {
Category(Category),
Before(DateIsh, bool),
After(DateIsh, bool),
}
impl Constraint {
fn satisfies(&self, t: &Transaction) -> bool {
match self {
Constraint::Category(category) => category == &t.category,
Constraint::Before(DateIsh::Absolute(date), inclusive) => if *inclusive {
&t.date <= date
} else {
&t.date < date
},
Constraint::After(DateIsh::Absolute(date), inclusive) => if *inclusive {
&t.date >= date
} else {
&t.date > date
}
Constraint::Before(DateIsh::Relative(diff), inclusive) => if *inclusive {
t.date <= chrono::offset::Local::today().naive_utc() + *diff
} else {
t.date < chrono::offset::Local::today().naive_utc() + *diff
}
Constraint::After(DateIsh::Relative(diff), inclusive) => if *inclusive {
t.date >= chrono::offset::Local::today().naive_utc() + *diff
} else {
t.date > chrono::offset::Local::today().naive_utc() + *diff
}
}
}
}
impl<'t> Search<'t> {
pub fn new(transactions: Vec<&'t Transaction>) -> Self {
Self {
filtered: std::iter::successors(Some(0_usize), |n| Some(n.checked_add(1).unwrap()))
.take(transactions.len())
.collect(),
transactions,
}
}
pub fn get(&self) -> Vec<&'t Transaction> {
self
.filtered
.iter()
.map(|idx| self.transactions[*idx])
.collect()
}
pub fn parse(self, rules: String) -> Self {
let (sub, rules) = {
if rules.chars().nth(0).unwrap() == '-' {
(true, &rules[1..])
} else {
(false, &rules[..])
}
};
//TODO lexing
// +category:a
//TODO: category:"foo bar"
// before:2021-01-01 => + (* -> 2020-12-31) n-incl
// after:2021-01-01 => + (2021-01-01 -> *) incl
// -before:2021-01-01 => - (2021-01-01 -> *) incl
// -after:2021-01-01 => - (* -> 2021-12-31) n-incl
//TODO:
// today is 2021-01-01:
// before:-1d => + (* -> 2020-12-31) n-incl
// after:-1d => + (2021-01-01 -> *) incl
// -before:-1d => - (2021-01-01 -> *) incl
// -after:-1d => - (* -> 2020-12-31) n-incl
let constraint = match rules.split_once(':').unwrap() {
("category", category) => Constraint::Category(category.to_string()),
("before", date_ish) => Constraint::Before(DateIsh::parse(date_ish), sub),
("after", date_ish) => Constraint::After(DateIsh::parse(date_ish), !sub),
_ => panic!(),
};
if sub {
self.subtract(constraint)
} else {
self.filter(constraint)
}
}
pub fn subtract(self, constraint: Constraint) -> Self {
Self {
filtered: self
.filtered
.iter()
.copied()
.filter(|idx| !constraint.satisfies(self.transactions[*idx]))
.collect(),
transactions: self.transactions,
}
}
pub fn filter(self, constraint: Constraint) -> Self {
Self {
filtered: self
.filtered
.iter()
.copied()
.filter(|idx| constraint.satisfies(self.transactions[*idx]))
.collect(),
transactions: self.transactions,
}
}
}
|
