Web-based Calendar Aggregator
https://ticker.c3d2.de/
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114 lines
3.1 KiB
114 lines
3.1 KiB
use std::collections::{HashMap, HashSet};
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use std::fmt::Write;
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use std::str::FromStr;
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use chrono::{NaiveDate, NaiveDateTime};
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mod tokenizer;
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mod parser;
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pub use parser::Parser;
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pub trait GetValue<'a, R: 'a> {
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fn get(&'a self, key: &'_ str) -> Option<R>;
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}
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pub type Props = Vec<(String, String)>;
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#[derive(Debug, PartialEq)]
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pub struct Object {
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pub name: String,
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pub content: HashMap<String, Vec<(Props, String)>>,
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pub children: Vec<Box<Object>>,
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}
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impl<'a> GetValue<'a, &'a str> for Object {
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fn get(&'a self, key: &'_ str) -> Option<&'a str> {
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self.content.get(key)
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.and_then(|pairs| pairs.first().map(|(_props, value)| value.as_str()))
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}
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}
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impl<'a> GetValue<'a, &'a (Props, String)> for Object {
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fn get(&'a self, key: &'_ str) -> Option<&'a (Props, String)> {
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self.content.get(key)
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.and_then(|pairs| pairs.first())
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}
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}
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impl<'a> GetValue<'a, &'a [(Props, String)]> for Object {
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fn get(&'a self, key: &'_ str) -> Option<&'a [(Props, String)]> {
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self.content.get(key)
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.map(|data| data.as_slice())
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}
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}
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impl<'a> GetValue<'a, String> for Object {
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fn get(&self, key: &'_ str) -> Option<String> {
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self.content.get(key)
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.and_then(|pairs| pairs.first().map(|(_props, value)| value.clone()))
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}
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}
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// TODO: TZID, offset
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impl<'a> GetValue<'a, Timestamp> for Object {
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fn get(&self, key: &'_ str) -> Option<Timestamp> {
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let s = self.get(key)?;
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Timestamp::from_str(s)
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.map_err(|e| println!("Cannot parse date: {:?}", e))
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.ok()
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}
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}
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impl Object {
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pub fn fmt_rrule(&self) -> Result<String, std::fmt::Error> {
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let rrule_keys = [
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"DTSTART",
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"RRULE", "RDATE",
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"EXRULE", "EXDATE",
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].iter().cloned().collect::<HashSet<_>>();
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let mut s = String::new();
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for (name, values) in &self.content {
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if ! rrule_keys.contains(name.as_str()) {
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continue;
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}
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for (props, value) in values {
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write!(s, "{}", name)?;
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for (key, prop) in props {
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write!(s, ";{}={}", key, prop)?;
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}
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writeln!(s, ":{}", value)?;
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}
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}
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Ok(s)
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}
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}
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#[derive(Debug, Clone)]
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pub enum Timestamp {
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Date(NaiveDate),
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DateTime(NaiveDateTime),
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}
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impl FromStr for Timestamp {
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type Err = String;
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fn from_str(s: &'_ str) -> Result<Self, Self::Err> {
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NaiveDateTime::parse_from_str(s, "%Y%m%dT%H%M%SZ")
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.or_else(|_| NaiveDateTime::parse_from_str(s, "%Y%m%dT%H%M%S"))
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.map(Timestamp::DateTime)
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.or_else(|_|
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NaiveDate::parse_from_str(s, "%Y%m%d")
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.map(Timestamp::Date)
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)
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.map_err(|e| format!("Cannot parse date: {:?}", e))
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}
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}
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impl Timestamp {
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pub fn or_hms(self, hour: u32, min: u32, sec: u32) -> NaiveDateTime {
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match self {
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Timestamp::Date(date) => date.and_hms(hour, min, sec),
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Timestamp::DateTime(date_time) => date_time,
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}
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}
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}
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