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90 lines
2.1 KiB
Markdown
90 lines
2.1 KiB
Markdown
# Extension
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By using `extend()`, you could add your own tokens or modify behavior of existing tokens. This is equivalent to define a new plugin without name.
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## Token
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Tokens in this library have the following rules:
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- All of the characters must be the same alphabet (`A-Z, a-z`).
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```javascript
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'E' // Good
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'EE' // Good
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'EEEEEEEEEE' // Good, but why so long!?
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'EES' // Not good
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'???' // Not good
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```
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- It is case sensitive.
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```javascript
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'eee' // Good
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'Eee' // Not good
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```
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- To the parser, it is not able to add token of new alphabet.
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```javascript
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'EEE' // This is not able to add because `E` is not an existing token in the parser.
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'YYY' // This is OK because `Y` token is existing in the parser.
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'SSS' // This is modifying, not adding. Because exactly the same token is existing.
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```
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## Examples
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### Example 1
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Add `E` token to the formatter. This new token will output "decade" like this:
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```javascript
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const d1 = new Date(2020, 0, 1);
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const d2 = new Date(2019, 0, 1);
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date.format(d1, '[The year] YYYY [is] E[s].'); // => "The year 2020 is 2020s."
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date.format(d2, '[The year] YYYY [is] E[s].'); // => "The year 2019 is 2010s."
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```
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Source code example is here:
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```javascript
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const date = require('date-and-time');
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date.extend({
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formatter: {
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E: function (d) {
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return (d.getFullYear() / 10 | 0) * 10;
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}
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}
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});
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```
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### Example 2
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In the parser, modify `MMM` token to ignore case:
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```javascript
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date.parse('Dec 25 2019', 'MMM DD YYYY'); // => December 25, 2019
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date.parse('dec 25 2019', 'MMM DD YYYY'); // => December 25, 2019
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date.parse('DEC 25 2019', 'MMM DD YYYY'); // => December 25, 2019
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```
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Source code example is here:
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```javascript
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const date = require('date-and-time');
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date.extend({
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parser: {
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MMM: function (str) {
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const mmm = this.res.MMM.map(m => m.toLowerCase());
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const result = this.find(mmm, str.toLowerCase());
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result.value++;
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return result;
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}
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}
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});
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```
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Modifying the parser may be a bit difficult. Refer to the library source code to grasp the default behavior.
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