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dtparse
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Add a custom parsing example in Russian

pull/24/head
Bradlee Speice 2018-08-03 23:40:54 -04:00
parent b966c02d04
commit 28b7bec91d
3 changed files with 100 additions and 45 deletions
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3
README.md
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@ -63,6 +63,7 @@ assert_eq!(
);
```
Further examples can be found in the `examples` directory on international usage.
Further examples can be found in the [examples](examples) directory on international usage.
[dateutil]: https://github.com/dateutil/dateutil
[examples]: https://github.com/bspeice/dtparse/tree/master/examples

39
examples/russian.rs Normal file
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@ -0,0 +1,39 @@
extern crate chrono;
extern crate dtparse;
use chrono::NaiveDate;
use dtparse::parse_info;
use dtparse::Parser;
use dtparse::ParserInfo;
use std::collections::HashMap;
fn main() {
// In this example, we'll just swap the default "months" parameter
// with a version in Russian. Lovingly taken from:
// https://github.com/dateutil/dateutil/blob/99f5770e7c63aa049b28abe465d7f1cc25b63fd2/dateutil/test/test_parser.py#L244
let mut info = ParserInfo::default();
info.months = parse_info(vec![
vec!["янв", "Январь"],
vec!["фев", "Февраль"],
vec!["мар", "Март"],
vec!["апр", "Апрель"],
vec!["май", "Май"],
vec!["июн", "Июнь"],
vec!["июл", "Июль"],
vec!["авг", "Август"],
vec!["сен", "Сентябрь"],
vec!["окт", "Октябрь"],
vec!["ноя", "Ноябрь"],
vec!["дек", "Декабрь"]
]);
let mut p = Parser::new(info);
assert_eq!(
p.parse("10 Сентябрь 2015 10:20", None, None, false, false, None, false, &HashMap::new())
.unwrap().0,
NaiveDate::from_ymd(2015, 9, 10).and_hms(10, 20, 0)
);
}

103
src/lib.rs
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@ -184,18 +184,33 @@ pub fn parse_info(vec: Vec<Vec<&str>>) -> HashMap<String, usize> {
/// and will be parsed as "YDM"
#[derive(Debug, PartialEq)]
pub struct ParserInfo {
jump: HashMap<String, usize>,
weekday: HashMap<String, usize>,
months: HashMap<String, usize>,
hms: HashMap<String, usize>,
ampm: HashMap<String, usize>,
utczone: HashMap<String, usize>,
pertain: HashMap<String, usize>,
tzoffset: HashMap<String, usize>,
dayfirst: bool,
yearfirst: bool,
year: i32,
century: i32,
/// Tokens that can be safely ignored
pub jump: HashMap<String, usize>,
/// Names of all seven weekdays
pub weekday: HashMap<String, usize>,
/// Names of all twelve months
pub months: HashMap<String, usize>,
/// Tokens to indicate a value is in units of hours, minutes, or seconds
pub hms: HashMap<String, usize>,
/// Tokens to indicate a value refers to AM or PM time
pub ampm: HashMap<String, usize>,
/// Tokens to indicate our timestamp is in the UTC timezone
pub utczone: HashMap<String, usize>,
/// Tokens to indicate values "belonging" to other tokens (e.g. 3rd *of* March)
pub pertain: HashMap<String, usize>,
/// Map of timezone names to their offset in seconds
pub tzoffset: HashMap<String, usize>,
/// For ambiguous year/month/day values, and `dayfirst` was not specified as
/// an argument to `Parser`, treat the first observed value as the day.
pub dayfirst: bool,
/// For ambiguous year/month/day values, and `dayfirst` was not specified as
/// an argument to `Parser`, treat the first observed value as the day.
/// Takes priority over `dayfirst`
pub yearfirst: bool,
/// The current year we are parsing values for
pub year: i32,
/// The current year we are parsing values for *modulo* 100
pub century: i32,
}
impl Default for ParserInfo {
@ -252,23 +267,23 @@ impl Default for ParserInfo {
}
impl ParserInfo {
fn get_jump(&self, name: &str) -> bool {
fn jump_index(&self, name: &str) -> bool {
self.jump.contains_key(&name.to_lowercase())
}
fn get_weekday(&self, name: &str) -> Option<usize> {
fn weekday_index(&self, name: &str) -> Option<usize> {
self.weekday.get(&name.to_lowercase()).map(|i| *i)
}
fn get_month(&self, name: &str) -> Option<usize> {
fn month_index(&self, name: &str) -> Option<usize> {
self.months.get(&name.to_lowercase()).map(|u| u + 1)
}
fn get_hms(&self, name: &str) -> Option<usize> {
fn hms_index(&self, name: &str) -> Option<usize> {
self.hms.get(&name.to_lowercase()).map(|i| *i)
}
fn get_ampm(&self, name: &str) -> Option<bool> {
fn ampm_index(&self, name: &str) -> Option<bool> {
if let Some(v) = self.ampm.get(&name.to_lowercase()) {
// Python technically uses numbers here, but given that the numbers are
// only 0 and 1, it's easier to use booleans
@ -278,15 +293,15 @@ impl ParserInfo {
}
}
fn get_pertain(&self, name: &str) -> bool {
fn pertain_index(&self, name: &str) -> bool {
self.pertain.contains_key(&name.to_lowercase())
}
fn get_utczone(&self, name: &str) -> bool {
fn utczone_index(&self, name: &str) -> bool {
self.utczone.contains_key(&name.to_lowercase())
}
fn get_tzoffset(&self, name: &str) -> Option<usize> {
fn tzoffset_index(&self, name: &str) -> Option<usize> {
if self.utczone.contains_key(&name.to_lowercase()) {
Some(0)
} else {
@ -319,7 +334,7 @@ impl ParserInfo {
res.tzname = Some("UTC".to_owned());
res.tzoffset = Some(0);
} else if res.tzoffset != Some(0) && res.tzname.is_some()
&& self.get_utczone(res.tzname.as_ref().unwrap())
&& self.utczone_index(res.tzname.as_ref().unwrap())
{
res.tzoffset = Some(0);
}
@ -709,9 +724,9 @@ impl Parser {
if let Ok(_v) = Decimal::from_str(&value_repr) {
i = self.parse_numeric_token(&l, i, &self.info, &mut ymd, &mut res, fuzzy)?;
} else if let Some(value) = self.info.get_weekday(&l[i]) {
} else if let Some(value) = self.info.weekday_index(&l[i]) {
res.weekday = Some(value);
} else if let Some(value) = self.info.get_month(&l[i]) {
} else if let Some(value) = self.info.month_index(&l[i]) {
ymd.append(value as i32, &l[i], Some(YMDLabel::Month))?;
if i + 1 < len_l {
@ -729,7 +744,7 @@ impl Parser {
i += 2;
} else if i + 4 < len_l && l[i + 1] == l[i + 3] && l[i + 3] == " "
&& self.info.get_pertain(&l[i + 2])
&& self.info.pertain_index(&l[i + 2])
{
// Jan of 01
if let Some(value) = l[i + 4].parse::<i32>().ok() {
@ -740,7 +755,7 @@ impl Parser {
i += 4;
}
}
} else if let Some(value) = self.info.get_ampm(&l[i]) {
} else if let Some(value) = self.info.ampm_index(&l[i]) {
let is_ampm = self.ampm_valid(res.hour, res.ampm, fuzzy);
if is_ampm == Ok(true) {
@ -753,7 +768,7 @@ impl Parser {
res.tzname = Some(l[i].clone());
let tzname = res.tzname.clone().unwrap();
res.tzoffset = self.info.get_tzoffset(&tzname).map(|t| t as i32);
res.tzoffset = self.info.tzoffset_index(&tzname).map(|t| t as i32);
if i + 1 < len_l && (l[i + 1] == "+" || l[i + 1] == "-") {
// GMT+3
@ -771,7 +786,7 @@ impl Parser {
res.tzoffset = None;
if self.info.get_utczone(&tzname) {
if self.info.utczone_index(&tzname) {
res.tzname = None;
}
}
@ -802,7 +817,7 @@ impl Parser {
Some(signal * (hour_offset.unwrap() * 3600 + min_offset.unwrap() * 60));
let tzname = res.tzname.clone();
if i + 5 < len_l && self.info.get_jump(&l[i + 2]) && l[i + 3] == "("
if i + 5 < len_l && self.info.jump_index(&l[i + 2]) && l[i + 3] == "("
&& l[i + 5] == ")" && 3 <= l[i + 4].len()
&& self.could_be_tzname(res.hour, tzname, None, &l[i + 4])
{
@ -812,7 +827,7 @@ impl Parser {
}
i += 1;
} else if !(self.info.get_jump(&l[i]) || fuzzy) {
} else if !(self.info.jump_index(&l[i]) || fuzzy) {
return Err(ParseError::UnrecognizedToken(l[i].clone()));
} else {
skipped_idxs.push(i);
@ -970,7 +985,7 @@ impl Parser {
// TODO: Decompose this logic a bit
if ymd.len() == 3 && (len_li == 2 || len_li == 4) && res.hour.is_none()
&& (idx + 1 >= len_l
|| (tokens[idx + 1] != ":" && info.get_hms(&tokens[idx + 1]).is_none()))
|| (tokens[idx + 1] != ":" && info.hms_index(&tokens[idx + 1]).is_none()))
{
// 1990101T32[59]
let s = &tokens[idx];
@ -1045,15 +1060,15 @@ impl Parser {
let sep = &tokens[idx + 1];
ymd.append(value_repr.parse::<i32>().unwrap(), &value_repr, None)?;
if idx + 2 < len_l && !info.get_jump(&tokens[idx + 2]) {
if idx + 2 < len_l && !info.jump_index(&tokens[idx + 2]) {
if let Ok(val) = tokens[idx + 2].parse::<i32>() {
ymd.append(val, &tokens[idx + 2], None)?;
} else if let Some(val) = info.get_month(&tokens[idx + 2]) {
} else if let Some(val) = info.month_index(&tokens[idx + 2]) {
ymd.append(val as i32, &tokens[idx + 2], Some(YMDLabel::Month))?;
}
if idx + 3 < len_l && &tokens[idx + 3] == sep {
if let Some(value) = info.get_month(&tokens[idx + 4]) {
if let Some(value) = info.month_index(&tokens[idx + 4]) {
ymd.append(value as i32, &tokens[idx + 4], Some(YMDLabel::Month))?;
} else {
if let Ok(val) = tokens[idx + 4].parse::<i32>() {
@ -1070,10 +1085,10 @@ impl Parser {
}
idx += 1
} else if idx + 1 >= len_l || info.get_jump(&tokens[idx + 1]) {
if idx + 2 < len_l && info.get_ampm(&tokens[idx + 2]).is_some() {
} else if idx + 1 >= len_l || info.jump_index(&tokens[idx + 1]) {
if idx + 2 < len_l && info.ampm_index(&tokens[idx + 2]).is_some() {
let hour = value.to_i64().unwrap() as i32;
let ampm = info.get_ampm(&tokens[idx + 2]).unwrap();
let ampm = info.ampm_index(&tokens[idx + 2]).unwrap();
res.hour = Some(self.adjust_ampm(hour, ampm));
idx += 1;
} else {
@ -1081,12 +1096,12 @@ impl Parser {
}
idx += 1;
} else if info.get_ampm(&tokens[idx + 1]).is_some()
} else if info.ampm_index(&tokens[idx + 1]).is_some()
&& (*ZERO <= value && value < *TWENTY_FOUR)
{
// 12am
let hour = value.to_i64().unwrap() as i32;
res.hour = Some(self.adjust_ampm(hour, info.get_ampm(&tokens[idx + 1]).unwrap()));
res.hour = Some(self.adjust_ampm(hour, info.ampm_index(&tokens[idx + 1]).unwrap()));
idx += 1;
} else if ymd.could_be_day(value.to_i64().unwrap() as i32) {
ymd.append(value.to_i64().unwrap() as i32, &value_repr, None)?;
@ -1145,16 +1160,16 @@ impl Parser {
0
};
if idx + 1 < len_l && info.get_hms(&tokens[idx + 1]).is_some() {
if idx + 1 < len_l && info.hms_index(&tokens[idx + 1]).is_some() {
hms_idx = Some(idx + 1)
} else if allow_jump && idx + 2 < len_l && tokens[idx + 1] == " "
&& info.get_hms(&tokens[idx + 2]).is_some()
&& info.hms_index(&tokens[idx + 2]).is_some()
{
hms_idx = Some(idx + 2)
} else if idx > 0 && info.get_hms(&tokens[idx - 1]).is_some() {
} else if idx > 0 && info.hms_index(&tokens[idx - 1]).is_some() {
hms_idx = Some(idx - 1)
} else if len_l > 0 && idx > 0 && idx == len_l - 1 && tokens[idx - 1] == " "
&& info.get_hms(&tokens[idx_minus_two]).is_some()
&& info.hms_index(&tokens[idx_minus_two]).is_some()
{
hms_idx = Some(idx - 2)
}
@ -1174,12 +1189,12 @@ impl Parser {
} else if hms_index.unwrap() > idx {
(
hms_index.unwrap(),
info.get_hms(&tokens[hms_index.unwrap()]),
info.hms_index(&tokens[hms_index.unwrap()]),
)
} else {
(
idx,
info.get_hms(&tokens[hms_index.unwrap()]).map(|u| u + 1),
info.hms_index(&tokens[hms_index.unwrap()]).map(|u| u + 1),
)
}
}