feature(@putout/engine-processor) add getExtensions

Author: coderaiser

packages/engine-processor/README.md

@@ -1,10 +1,9 @@
 # @putout/engine-processor [![NPM version][NPMIMGURL]][NPMURL] [![Dependency Status][DependencyStatusIMGURL]][DependencyStatusURL]
 
-[NPMIMGURL]:                https://img.shields.io/npm/v/@putout/engine-loader.svg?style=flat&longCache=true
-[NPMURL]:                   https://npmjs.org/package/@putout/engine-loader"npm"
-
-[DependencyStatusURL]:      https://david-dm.org/coderaiser/putout?path=packages/engine-loader
-[DependencyStatusIMGURL]:   https://david-dm.org/coderaiser/putout.svg?path=packages/engine-loader
+[NPMIMGURL]: https://img.shields.io/npm/v/@putout/engine-loader.svg?style=flat&longCache=true
+[NPMURL]: https://npmjs.org/package/@putout/engine-loader"npm"
+[DependencyStatusURL]: https://david-dm.org/coderaiser/putout?path=packages/engine-loader
+[DependencyStatusIMGURL]: https://david-dm.org/coderaiser/putout.svg?path=packages/engine-loader
 
 Run putout `pre-` and `post-` processors.
 
@@ -30,7 +29,7 @@ runProcessors({
     isProcessed,
     places,
     processedSource,
-})
+});
 ```
 
 ## Processor Example
@@ -39,7 +38,7 @@ Simplest possible procesor exampmle can look like this:
 
 ```js
 module.exports.extensions = [
-    'js'
+    'js',
 ];
 
 // preProcess should always return array of sources that was get from source
@@ -59,4 +58,3 @@ module.exports.postProcess = (source, list) => {
 ## License
 
 MIT
-

packages/engine-processor/lib/processor.js

@@ -9,6 +9,18 @@ const defaultProcessors = [
 
 const addExtension = (name, ext) => !ext ? name : `${name}{${ext}}`;
 
+module.exports.defaultProcessors = defaultProcessors;
+
+module.exports.getExtensions = (processors) => {
+    const result = [];
+    
+    for (const {extensions} of processors) {
+        result.push(...extensions);
+    }
+    
+    return result;
+};
+
 module.exports.runProcessors = async ({name, process, options, rawSource, index, length}) => {
     const allPlaces = [];
     const ext = extname(name).slice(1);

packages/engine-processor/test/processor.js

@@ -5,7 +5,7 @@ const {join} = require('path');
 
 const test = require('supertape');
 const stub = require('@cloudcmd/stub');
-const {runProcessors} = require('..');
+const {runProcessors, getExtensions} = require('..');
 
 test('putout: engine-processor: no processor', async (t) => {
     const name = 'hello.xxx';
@@ -100,3 +100,30 @@ test('putout: engine-processor: markdown: javascript', async (t) => {
     t.end();
 });
 
+test('putout: engine-processor: getExtensions', (t) => {
+    const js = {
+        extensions: [
+            'js',
+            'ts',
+        ],
+    };
+    
+    const css = {
+        extensions: [
+            'css',
+        ],
+    };
+    
+    const processors = [js, css];
+    const result = getExtensions(processors);
+    
+    const expected = [
+        'js',
+        'ts',
+        'css',
+    ];
+    
+    t.deepEqual(expected, result, 'should equal');
+    t.end();
+});
+