feat(rules): Added HalfWidth rule

Author: ricardogobbosouza

README.md

@@ -139,6 +139,7 @@ The library can be loaded either as a standalone script, or through an [AMD](htt
 - [FunctionName](docs/function-name.md)
 - [FunctionType](docs/function-type.md)
 - [Graph](docs/graph.md)
+- [HalfWidth](docs/half-width.md)
 - [HexRgbColor](docs/hex-rgb-color.md)
 - [Identical](docs/identical.md)
 - [Image](docs/image.md)

docs/half-width.md

@@ -0,0 +1,17 @@
+# HalfWidth
+
+Validates if the given input is half width.
+
+Valid values:
+
+```js
+validator.halfWidth().validate('!"#$%&()<>/+=-_? ~^|.,@`{}[]');
+validator.halfWidth().validate('l-btn_02--active');
+```
+
+Invalid values:
+
+```js
+validator.halfWidth().validate('あいうえお');
+validator.halfWidth().validate('００１１');
+```

src/rules/half-width.ts

@@ -0,0 +1,13 @@
+import { AbstractRegex } from './abstract-regex';
+
+export class HalfWidth  extends AbstractRegex {
+
+    /**
+     * Get pattern.
+     */
+    protected getPattern(): string | RegExp {
+        return /[\u0020-\u007E\uFF61-\uFF9F\uFFA0-\uFFDC\uFFE8-\uFFEE0-9a-zA-Z]/;
+    }
+}
+
+export default HalfWidth;

src/rules/index.ts

@@ -57,6 +57,7 @@ export * from './function-instance';
 export * from './function-name';
 export * from './function-type';
 export * from './graph';
+export * from './half-width';
 export * from './hex-rgb-color';
 export * from './identical';
 export * from './image';

test/rules/half-width.ts

@@ -0,0 +1,30 @@
+import { assert } from 'chai';
+
+import { AbstractRule } from '../../src/rules/abstract-rule';
+import { HalfWidth } from '../../src/rules/half-width';
+
+describe('HalfWidth', () => {
+
+    let halfWidth: HalfWidth;
+
+    beforeEach(() => {
+        halfWidth = new HalfWidth();
+    });
+
+    it('is rule', () => {
+        assert.instanceOf(halfWidth, AbstractRule);
+    });
+
+    it('values is valid', () => {
+        assert.isTrue(halfWidth.validate('!"#$%&()<>/+=-_? ~^|.,@`{}[]'));
+        assert.isTrue(halfWidth.validate('l-btn_02--active'));
+        assert.isTrue(halfWidth.validate('abc123い'));
+        assert.isTrue(halfWidth.validate('ｶﾀｶﾅﾞﾬ￩'));
+    });
+
+    it('values is not valid', () => {
+        assert.isFalse(halfWidth.validate('あいうえお'));
+        assert.isFalse(halfWidth.validate('００１１'));
+    });
+
+});