@iotize/ionic
Version:
Iotize specific building blocks on top of @ionic/angular.
62 lines • 6.41 kB
JavaScript
import { Pipe } from '@angular/core';
import * as i0 from "@angular/core";
/**
* Pipe to extract a bit value or a bit range from a number.
* Returns 0 when parameters are not valid
*
* For example:
*
* ```
* expect(pipe.transform(0b0101, '2')).toEqual(1, 'transform with parameter 2 should returns value of bit at position 2');
* // Extracting bits n° 1 and n°2 (index starts at 0)
* expect(pipe.transform(0b0101, '1-2')).toEqual(0b10);
* ````
*/
export class ExtractBitsPipe {
transform(value, format) {
if (typeof value !== 'number') {
console.warn(`Invalid value for "extractBits". Should be a number. Given: ${typeof value}`, value);
return 0;
}
let min, max;
if (typeof format === 'string') {
if (format.indexOf('-') >= 0) {
[min, max] = format.split('-').map((v) => {
if (!v) {
return 0;
}
else {
return parseInt(v, 10);
}
});
}
else {
min = max = parseInt(format, 10);
}
}
else if (typeof format === 'number') {
min = format;
max = format;
}
else {
// No format given, we always return 0
return 0;
}
// For example with max = 3 min = 1
// # => 0b0001110
// eslint-disable-next-line no-bitwise
const valueMask = ((1 << (max - min + 1)) - 1) << min;
// eslint-disable-next-line no-bitwise
value = (value & valueMask) >> min;
return value;
}
/** @nocollapse */ static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.14", ngImport: i0, type: ExtractBitsPipe, deps: [], target: i0.ɵɵFactoryTarget.Pipe });
/** @nocollapse */ static ɵpipe = i0.ɵɵngDeclarePipe({ minVersion: "14.0.0", version: "18.2.14", ngImport: i0, type: ExtractBitsPipe, name: "extractBits" });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.14", ngImport: i0, type: ExtractBitsPipe, decorators: [{
type: Pipe,
args: [{
name: 'extractBits',
}]
}] });
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