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use chrono::{NaiveDate, NaiveDateTime, NaiveTime};
use humantime::parse_duration;
use std::time::Duration;
use time;
use super::error::*;
use failure::ResultExt;
#[derive(Default, Debug)]
pub struct CommandParser {
on_date: Option<String>,
at_time: Option<String>,
in_duration: Option<String>,
every_time: Option<String>,
target: String,
message: Option<String>,
}
#[derive(PartialEq, Clone, Copy)]
enum ParseState {
None,
On,
At,
In,
Every,
Msg,
}
impl CommandParser {
pub fn parse_target(mut tokens: Vec<String>) -> Result<Self, RemindError> {
let mut parser = CommandParser::default();
if tokens.is_empty() {
Err(ErrorKind::MissingReceiver)?;
}
parser.target = tokens.remove(0);
parser.parse_tokens(tokens)
}
pub fn with_target(tokens: Vec<String>, target: String) -> Result<Self, RemindError> {
let mut parser = CommandParser::default();
parser.target = target;
parser.parse_tokens(tokens)
}
fn parse_tokens(mut self, tokens: Vec<String>) -> Result<Self, RemindError> {
let mut state = ParseState::None;
let mut cur_str = String::new();
for token in tokens {
let next_state = match token.as_ref() {
"on" => ParseState::On,
"at" => ParseState::At,
"in" => ParseState::In,
"every" => ParseState::Every,
"to" => ParseState::Msg,
_ => {
if !cur_str.is_empty() {
cur_str.push(' ');
}
cur_str.push_str(&token);
state
}
};
if next_state != state {
if state != ParseState::None {
self = self.add_string_by_state(&state, cur_str)?;
cur_str = String::new();
}
state = next_state;
}
}
self = self.add_string_by_state(&state, cur_str)?;
if self.message.is_none() {
return Err(ErrorKind::MissingMessage.into());
}
if self.in_duration.is_some() && self.at_time.is_some()
|| self.in_duration.is_some() && self.on_date.is_some()
{
return Err(ErrorKind::AmbiguousTime.into());
}
if self.in_duration.is_none() && self.at_time.is_none() && self.on_date.is_none() {
return Err(ErrorKind::MissingTime.into());
}
Ok(self)
}
fn add_string_by_state(self, state: &ParseState, string: String) -> Result<Self, RemindError> {
use self::ParseState::*;
let string = Some(string);
match state {
On if self.on_date.is_none() => Ok(CommandParser {
on_date: string,
..self
}),
At if self.at_time.is_none() => Ok(CommandParser {
at_time: string,
..self
}),
In if self.in_duration.is_none() => Ok(CommandParser {
in_duration: string,
..self
}),
Msg if self.message.is_none() => Ok(CommandParser {
message: string,
..self
}),
Every if self.every_time.is_none() => Ok(CommandParser {
every_time: string,
..self
}),
_ => Err(ErrorKind::MissingMessage.into()),
}
}
fn parse_date(&self, str_date: &str) -> Result<NaiveDate, RemindError> {
let nums = str_date
.split('.')
.map(|s| s.parse::<u32>())
.collect::<Result<Vec<_>, _>>()
.context(ErrorKind::InvalidDate)?;
if 2 > nums.len() || nums.len() > 3 {
return Err(ErrorKind::InvalidDate.into());
}
let day = nums[0];
let month = nums[1];
let parse_date = match nums.get(2) {
Some(year) => {
NaiveDate::from_ymd_opt(*year as i32, month, day).ok_or(ErrorKind::InvalidDate)?
}
None => {
let now = time::now();
let date = NaiveDate::from_ymd_opt(now.tm_year + 1900, month, day)
.ok_or(ErrorKind::InvalidDate)?;
if date.succ().and_hms(0, 0, 0).timestamp() < now.to_timespec().sec {
NaiveDate::from_ymd(now.tm_year + 1901, month, day)
} else {
date
}
}
};
Ok(parse_date)
}
fn parse_time(&self, str_time: &str) -> Result<NaiveTime, RemindError> {
let nums = str_time
.split(':')
.map(|s| s.parse::<u32>())
.collect::<Result<Vec<_>, _>>()
.context(ErrorKind::InvalidTime)?;
if 2 != nums.len() {
return Err(ErrorKind::InvalidTime.into());
}
let hour = nums[0];
let minute = nums[1];
Ok(NaiveTime::from_hms(hour, minute, 0))
}
pub fn get_time(&self, min_dur: Duration) -> Result<NaiveDateTime, RemindError> {
if let Some(ref str_duration) = self.in_duration {
let duration = parse_duration(&str_duration).context(ErrorKind::InvalidTime)?;
if duration < min_dur {
return Err(ErrorKind::TimeShort.into());
}
let tm = time::now().to_timespec();
return Ok(NaiveDateTime::from_timestamp(
tm.sec + duration.as_secs() as i64,
0u32,
));
}
let mut date = None;
if let Some(ref str_date) = self.on_date {
date = Some(self.parse_date(str_date)?);
}
if let Some(ref str_time) = self.at_time {
let time = self.parse_time(str_time)?;
if let Some(date) = date {
Ok(date.and_time(time))
} else {
let now = time::now();
let today = NaiveDate::from_ymd_opt(
now.tm_year + 1900,
now.tm_mon as u32 + 1,
now.tm_mday as u32,
).ok_or(ErrorKind::InvalidDate)?;
let time_today = today.and_time(time);
if time_today.timestamp() < now.to_timespec().sec {
debug!("tomorrow");
Ok(today.succ().and_time(time))
} else {
debug!("today");
Ok(time_today)
}
}
} else {
Ok(date.expect("At this point date has to be set")
.and_hms(0, 0, 0))
}
}
pub fn get_repeat(&self, min_dur: Duration) -> Result<Option<Duration>, RemindError> {
if let Some(mut words) = self.every_time.clone() {
if !words.chars().next().unwrap().is_digit(10) {
words.insert(0, '1');
}
let dur = parse_duration(&words).context(ErrorKind::InvalidTime)?;
if dur < min_dur {
return Err(ErrorKind::RepeatTimeShort.into());
}
Ok(Some(dur))
} else {
Ok(None)
}
}
pub fn get_target(&self) -> &str {
&self.target
}
pub fn get_message(&self) -> &str {
self.message.as_ref().expect("Has to be set")
}
}
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