feat(import-notation): add expand to api

Author: Vittly

packages/import-notation/index.js

@@ -23,7 +23,7 @@ const BemCellSet = hashSet(helpers.stringifyCell);
 function parse(importString, ctx) {
     const cell = {};
 
-    ctx && (importString = helpers.expand(importString, ctx));
+    ctx && (importString = expand(importString, ctx));
 
     return Array.from(importString.split(' ').reduce((acc, importToken) => {
         const split = importToken.split(':'),
@@ -92,5 +92,6 @@ function stringify(cells) {
 
 module.exports = {
     parse,
-    stringify
+    stringify,
+    expand: helpers.expand
 };

packages/import-notation/test/expand.test.js

@@ -0,0 +1,28 @@
+var expect = require('chai').expect,
+    e = require('..').expand;
+
+it('should return notation if no ctx specified', () => {
+    expect(e('b:button')).to.eql('b:button');
+});
+
+describe('ctx', () => {
+    describe('block', () => {
+        it('should copy block if notation has no block', () => {
+            expect(e('e:icon', { block: 'button' })).to.eql('b:button e:icon');
+        });
+
+        it('should not copy block if notation has block', () => {
+            expect(e('b:button e:icon', { block: 'input' })).to.eql('b:button e:icon');
+        });
+    });
+
+    describe('elem', () => {
+        it('should copy elem if notation has no elem', () => {
+            expect(e('m:theme=default', { block: 'button', elem: 'icon' })).to.eql('b:button e:icon m:theme=default');
+        });
+
+        it('should not copy elem if notation has elem', () => {
+            expect(e('b:button e:icon', { block: 'input', elem: 'clear' })).to.eql('b:button e:icon');
+        });
+    });
+});