dualfroz
fa0fa5b55b
common.Timezone matches UTC and GMT with an optional offset (UTC+2, GMT-05:30, GMT+0530) and a small table of upper case abbreviations (EST, PDT, CET, ...), and sets Context.Location, so "10 pm EST" comes back as 22:00 in a -05:00 zone. A timezone alone does not count as a match. It is not added to common.All, so existing parsers behave as before.
129 lines
4.3 KiB
Markdown
129 lines
4.3 KiB
Markdown
# when [](https://godoc.org/github.com/olebedev/when)
|
|
|
|
> `when` is a natural language date/time parser with pluggable rules and merge strategies
|
|
|
|
### Examples
|
|
|
|
- **tonight at 11:10 pm**
|
|
- at **Friday afternoon**
|
|
- the deadline is **next tuesday 14:00**
|
|
- drop me a line **next wednesday at 2:25 p.m**
|
|
- it could be done at **11 am past tuesday**
|
|
|
|
Check [EN](https://github.com/olebedev/when/blob/master/rules/en) rules and tests of them, for more examples.
|
|
|
|
**Needed rule not found?**
|
|
Open [an issue](https://github.com/olebedev/when/issues/new) with the case and it will be added asap.
|
|
|
|
### How it works
|
|
|
|
Usually, there are several rules added to the parser's instance for checking. Each rule has its own borders - length and offset in provided string. Meanwhile, each rule yields only the first match over the string. So, the library checks all the rules and extracts a cluster of matched rules which have distance between each other less or equal to [`options.Distance`](https://github.com/olebedev/when/blob/master/when.go#L141-L144), which is 5 by default. For example:
|
|
|
|
```
|
|
on next wednesday at 2:25 p.m.
|
|
└──────┬─────┘ └───┬───┘
|
|
weekday hour + minute
|
|
```
|
|
|
|
So, we have a cluster of matched rules - `"next wednesday at 2:25 p.m."` in the string representation.
|
|
|
|
After that, each rule is applied to the context. In order of definition or in match order, if [`options.MatchByOrder`](https://github.com/olebedev/when/blob/master/when.go#L141-L144) is set to `true`(which it is by default). Each rule could be applied with given merge strategy. By default, it's an [Override](https://github.com/olebedev/when/blob/master/rules/rules.go#L13) strategy. The other strategies are not implemented yet in the rules. **Pull requests are welcome.**
|
|
|
|
### Supported Languages
|
|
|
|
- [EN](https://github.com/olebedev/when/blob/master/rules/en) - English
|
|
- [RU](https://github.com/olebedev/when/blob/master/rules/ru) - Russian
|
|
- [BR](https://github.com/olebedev/when/blob/master/rules/br) - Brazilian Portuguese
|
|
- [ZH](https://github.com/olebedev/when/blob/master/rules/zh) - Chinese
|
|
- [NL](https://github.com/olebedev/when/blob/master/rules/nl) - Dutch
|
|
|
|
### Install
|
|
|
|
The project follows the official [release workflow](https://go.dev/doc/modules/release-workflow). It is recommended to refer to this resource for detailed information on the process.
|
|
|
|
To install the latest version:
|
|
|
|
```
|
|
$ go get github.com/olebedev/when@latest
|
|
```
|
|
|
|
### Usage
|
|
|
|
```go
|
|
w := when.New(nil)
|
|
w.Add(en.All...)
|
|
w.Add(common.All...)
|
|
|
|
text := "drop me a line in next wednesday at 2:25 p.m"
|
|
r, err := w.Parse(text, time.Now())
|
|
if err != nil {
|
|
// an error has occurred
|
|
}
|
|
if r == nil {
|
|
// no matches found
|
|
}
|
|
|
|
fmt.Println(
|
|
"the time",
|
|
r.Time.String(),
|
|
"mentioned in",
|
|
text[r.Index:r.Index+len(r.Text)],
|
|
)
|
|
```
|
|
|
|
#### Distance Option
|
|
|
|
```go
|
|
w := when.New(nil)
|
|
w.Add(en.All...)
|
|
w.Add(common.All...)
|
|
|
|
text := "February 23, 2019 | 1:46pm"
|
|
|
|
// With default distance (5):
|
|
// February 23, 2019 | 1:46pm
|
|
// └───┬───┘
|
|
// distance: 9 (1:46pm will be ignored)
|
|
|
|
r, _ := w.Parse(text, time.Now())
|
|
fmt.Printf(r.Time.String())
|
|
// "2019-02-23 09:21:21.835182427 -0300 -03"
|
|
// 2019-02-23 (correct)
|
|
// 09:21:21 ("wrong")
|
|
|
|
// With custom distance (10):
|
|
w.SetOptions(&rules.Options{
|
|
Distance: 10,
|
|
MatchByOrder: true})
|
|
|
|
r, _ = w.Parse(text, time.Now())
|
|
fmt.Printf(r.Time.String())
|
|
// "2019-02-23 13:46:21.559521554 -0300 -03"
|
|
// 2019-02-23 (correct)
|
|
// 13:46:21 (correct)
|
|
```
|
|
|
|
#### Timezones
|
|
|
|
The timezone rule is not part of `common.All`, add it to have `10 pm EST` or `22:00 UTC+2` returned in that zone:
|
|
|
|
```go
|
|
w.Add(common.Timezone(rules.Override))
|
|
```
|
|
|
|
It knows `UTC` and `GMT` with an optional offset (`GMT-05:30`, `UTC+0530`) and a few upper case abbreviations (`EST`, `PDT`, `CET`, ...), each as a fixed offset.
|
|
|
|
### State of the project
|
|
|
|
The project is in a more-or-less complete state. It's used for one project already. Bugs will be fixed as soon as they will be found.
|
|
|
|
### TODO
|
|
|
|
- [ ] readme: describe all the existing rules
|
|
- [ ] implement missed rules for [these examples](https://github.com/mojombo/chronic#examples)
|
|
- [ ] add cli and simple rest api server([#2](https://github.com/olebedev/when/issues/2))
|
|
|
|
### LICENSE
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|