diff --git a/src/shared/marki.context.ts b/src/shared/marki.context.ts
index f23fb3d..591f083 100644
--- a/src/shared/marki.context.ts
+++ b/src/shared/marki.context.ts
@@ -41,11 +41,11 @@ export default class MarkiContext {
     let lexer = new marked.Lexer();
     $this.tokens = lexer.lex(source);
 
-    $this.doFilter();
+    $this.doCodeFilter();
     $this.doHandleCustomizeCodeType();
   }
 
-  private doFilter() {
+  private doCodeFilter() {
     let $this = this;
 
     _.each($this.codeFilters, function (needFilteredCode) {
@@ -69,18 +69,26 @@ export default class MarkiContext {
   }
 
   private doHandleCustomizeCodeType() {
-    // perform pre-handle
-
     // perform handle
+    let $this = this;
+
+    let groupByLanguageCodeHandlers = _.groupBy($this.codeHandlers,function (handler) {
+      return handler.language;
+    });
+
+
+    _.each($this.needHandleTokens,function (token) {
+
+    });
   }
 
   /* export level functions */
-  addCodeFilters(filterCode: CodeFilter) {
+  public addCodeFilters(filterCode: CodeFilter) {
     let $this = this;
     $this.codeFilters.push(filterCode);
   }
 
-  addCodeHandlers(language: string, handlerFn: Function) {
+  public addCodeHandlers(language: string, handlerFn: Function) {
     let $this = this;
     $this.codeHandlers.push({
       language: language,
diff --git a/test/unit/specs/codefilter.spec.js b/test/unit/specs/code-filter.spec.js
similarity index 100%
rename from test/unit/specs/codefilter.spec.js
rename to test/unit/specs/code-filter.spec.js
diff --git a/test/unit/specs/code-handler.spec.js b/test/unit/specs/code-handler.spec.js
new file mode 100644
index 0000000..9563a66
--- /dev/null
+++ b/test/unit/specs/code-handler.spec.js
@@ -0,0 +1,30 @@
+import * as marked from 'marked';
+import MarkiContext from '@/shared/marki.context';
+
+import mdStringWithMetadataCodeType from '../data/post-with-metadata.md';
+
+describe('code handler', function() {
+
+
+  describe('metadata handler',function() {
+    let $this = this;
+    $this.marki = new MarkiContext();
+
+
+    beforeEach('# add metadata filter',function() {
+      $this.marki = new MarkiContext();
+      $this.marki.addCodeFilters({
+        language: 'metadata',
+        handle: true
+      });
+
+    });
+
+    it('# handler: metadata', function() {
+      $this.marki.addCodeHandlers('metadata',function(markiContext,singleToken) {
+        console.log('try log single token:',singleToken);
+      });
+    });
+
+  });
+});