feat(facade/primitives/StringWrapper): add utils for casing transforms

src/facade/primitives.ts

@@ -1,5 +1,9 @@
 import {isNumber} from "./lang";
 
+
+const _kebabCase = _caseTransformerFactory('-');
+const _snakeCase = _caseTransformerFactory('_');
+
 export class StringWrapper {
   static fromCharCode( code: number ): string { return String.fromCharCode( code ); }
 
@@ -101,4 +105,29 @@ export class StringWrapper {
 
   }
 
+  static kebabCase( name: string ) {
+    return _kebabCase( name );
+  }
+  static snakeCase( name: string ) {
+    return _snakeCase( name );
+  }
+
+}
+
+function _caseTransformerFactory( separator: string ): ( name: string )=>string {
+
+  const SNAKE_CASE_REGEXP = /[A-Z]/g;
+
+  return _caseTransform;
+
+  function _caseTransform( name ) {
+    return name.replace( SNAKE_CASE_REGEXP, function ( match: string, offset: number ) {
+      return (
+          offset
+            ? separator
+            : ''
+        ) + match.toLowerCase();
+    } );
+  }
+
 }

test/facade/primitives.spec.ts

@@ -42,4 +42,28 @@ describe( `facade/primitives`, ()=> {
 
   } );
 
+  describe( `string transforms`, ()=> {
+
+    it( `should convert camelCase to kebabCase`, ()=> {
+
+      const str = 'mooFooYooBoo';
+      const actual = StringWrapper.kebabCase(str);
+      const expected = 'moo-foo-yoo-boo';
+
+      expect( actual ).to.equal( expected );
+
+    } );
+
+    it( `should convert camelCase to snakeCase`, ()=> {
+
+      const str = 'mooFooYooBoo';
+      const actual = StringWrapper.snakeCase(str);
+      const expected = 'moo_foo_yoo_boo';
+
+      expect( actual ).to.equal( expected );
+
+    } );
+
+  } );
+
 } );