Web-based Calendar Aggregator https://ticker.c3d2.de/
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3.1 KiB

use std::collections::{HashMap, HashSet};
use std::fmt::Write;
use std::str::FromStr;
use chrono::{NaiveDate, NaiveDateTime};
mod tokenizer;
mod parser;
pub use parser::Parser;
pub trait GetValue<'a, R: 'a> {
fn get(&'a self, key: &'_ str) -> Option<R>;
}
pub type Props = Vec<(String, String)>;
#[derive(Debug, PartialEq)]
pub struct Object {
pub name: String,
pub content: HashMap<String, Vec<(Props, String)>>,
pub children: Vec<Box<Object>>,
}
impl<'a> GetValue<'a, &'a str> for Object {
fn get(&'a self, key: &'_ str) -> Option<&'a str> {
self.content.get(key)
.and_then(|pairs| pairs.first().map(|(_props, value)| value.as_str()))
}
}
impl<'a> GetValue<'a, &'a (Props, String)> for Object {
fn get(&'a self, key: &'_ str) -> Option<&'a (Props, String)> {
self.content.get(key)
.and_then(|pairs| pairs.first())
}
}
impl<'a> GetValue<'a, &'a [(Props, String)]> for Object {
fn get(&'a self, key: &'_ str) -> Option<&'a [(Props, String)]> {
self.content.get(key)
.map(|data| data.as_slice())
}
}
impl<'a> GetValue<'a, String> for Object {
fn get(&self, key: &'_ str) -> Option<String> {
self.content.get(key)
.and_then(|pairs| pairs.first().map(|(_props, value)| value.clone()))
}
}
// TODO: TZID, offset
impl<'a> GetValue<'a, Timestamp> for Object {
fn get(&self, key: &'_ str) -> Option<Timestamp> {
let s = self.get(key)?;
Timestamp::from_str(s)
.map_err(|e| println!("Cannot parse date: {:?}", e))
.ok()
}
}
impl Object {
pub fn fmt_rrule(&self) -> Result<String, std::fmt::Error> {
let rrule_keys = [
"DTSTART",
"RRULE", "RDATE",
"EXRULE", "EXDATE",
].iter().cloned().collect::<HashSet<_>>();
let mut s = String::new();
for (name, values) in &self.content {
if ! rrule_keys.contains(name.as_str()) {
continue;
}
for (props, value) in values {
write!(s, "{}", name)?;
for (key, prop) in props {
write!(s, ";{}={}", key, prop)?;
}
writeln!(s, ":{}", value)?;
}
}
Ok(s)
}
}
#[derive(Debug, Clone)]
pub enum Timestamp {
Date(NaiveDate),
DateTime(NaiveDateTime),
}
impl FromStr for Timestamp {
type Err = String;
fn from_str(s: &'_ str) -> Result<Self, Self::Err> {
NaiveDateTime::parse_from_str(s, "%Y%m%dT%H%M%SZ")
.or_else(|_| NaiveDateTime::parse_from_str(s, "%Y%m%dT%H%M%S"))
.map(Timestamp::DateTime)
.or_else(|_|
NaiveDate::parse_from_str(s, "%Y%m%d")
.map(Timestamp::Date)
)
.map_err(|e| format!("Cannot parse date: {:?}", e))
}
}
impl Timestamp {
pub fn or_hms(self, hour: u32, min: u32, sec: u32) -> NaiveDateTime {
match self {
Timestamp::Date(date) => date.and_hms(hour, min, sec),
Timestamp::DateTime(date_time) => date_time,
}
}
}