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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>,
}
#[derive(Clone)]
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 fn get(self) -> NaiveDate {
match self {
DateIsh::Absolute(date) => date,
DateIsh::Relative(offset) => chrono::offset::Local::today().naive_utc() + offset
}
}
}
pub enum Constraint {
Category(Category),
Before(DateIsh),
After(DateIsh),
}
enum FilterType {
Add(Constraint),
Subtract(Constraint),
Only(Constraint),
}
impl FilterType {
fn apply<'s>(&self, mut search: Search<'s>) -> Search<'s> {
match self {
FilterType::Add(_) => {
//TODO binary search and insert sorted
for idx in search
.transactions
.iter()
.enumerate()
.filter(|(_, t)| self.satisfies(t))
.map(|(idx, _)| idx)
{
search.filtered.push(idx);
}
search.filtered.sort();
search.filtered.dedup();
}
FilterType::Subtract(_) => {
search.filtered = search
.filtered
.iter()
.filter(|t| !self.satisfies(search.transactions[**t]))
.copied()
.collect();
}
FilterType::Only(_) => {
search.filtered = search
.filtered
.iter()
.filter(|t| self.satisfies(search.transactions[**t]))
.copied()
.collect();
}
}
search
}
fn satisfies(&self, transaction: &Transaction) -> bool {
match self {
// Category
FilterType::Add(Constraint::Category(category))
| FilterType::Subtract(Constraint::Category(category))
| FilterType::Only(Constraint::Category(category))
=> &transaction.category == category,
FilterType::Only(Constraint::Before(date))
=> transaction.date < date.clone().get(),
FilterType::Only(Constraint::After(date))
=> transaction.date >= date.clone().get(),
FilterType::Add(Constraint::Before(date))
=> transaction.date < date.clone().get(),
FilterType::Add(Constraint::After(date))
=> transaction.date >= date.clone().get(),
FilterType::Subtract(Constraint::Before(date))
=> transaction.date < date.clone().get(),
FilterType::Subtract(Constraint::After(date))
=> transaction.date >= date.clone().get(),
}
}
}
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(mut self, rules: String) -> Self {
for rule in rules.split(' ') {
let (filter_type, rule): (fn(Constraint) -> FilterType, &str) = match rule.chars().nth(0).unwrap() {
'-' => (FilterType::Subtract, &rule[1..]),
'+' => (FilterType::Add, &rule[1..]),
_ => (FilterType::Only, &rule[..]),
};
//TODO lexing? can do a function for "spaces inside" instead
// +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 rule.split_once(':').unwrap() {
("category", category) => Constraint::Category(category.to_string()),
("before", date_ish) => Constraint::Before(DateIsh::parse(date_ish)),
("after", date_ish) => Constraint::After(DateIsh::parse(date_ish)),
_ => panic!(),
};
self = filter_type(constraint).apply(self);
}
self
}
}
|
