feat: allow regexps in singleTags option

README.md

@@ -53,18 +53,19 @@ __In Browser__
 ## Options
 
 ### singleTags
-Array tags for extend default list single tags
+Array tags for extend default list single tags. Values can be strings or regular expressions.
 
 __Default__: `[]`
 
-*Options* `{ singleTags: ['rect', 'custom'] }`
+*Options* `{ singleTags: ['rect', 'custom', /^%.*%$/] }`
 
 ```html
 ...
 <div>
     ...
     <rect>
     <custom>
+    <%=title%>
 </div>
 ```
 

lib/posthtml-render.js

@@ -25,14 +25,19 @@ function postHTMLRender(tree, options) {
     var SINGLE_TAGS = ['area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'keygen',
                         'link', 'menuitem', 'meta', 'param', 'source', 'track', 'wbr'];
     var singleTags = {};
+    var regexpSingleTags = [];
 
     for (var i = 0, leni = SINGLE_TAGS.length; i < leni; i++) {
         singleTags[SINGLE_TAGS[i]] = 1;
     }
 
     if (optSingleTags) {
         for (var j = 0, lenj = optSingleTags.length; j < lenj; j++) {
-            singleTags[optSingleTags[j]] = 1;
+            if (optSingleTags[j] instanceof RegExp) {
+                regexpSingleTags.push(optSingleTags[j]);
+            } else {
+                singleTags[optSingleTags[j]] = 1;
+            }
         }
     }
 
@@ -60,7 +65,7 @@ function postHTMLRender(tree, options) {
             }
 
             var tag = node.tag || 'div';
-            if (singleTags[tag]) {
+            if (isSingleTag(tag, singleTags, regexpSingleTags)) {
                 buf += '<'+ tag + attrs(node.attrs);
                 switch (closingSingleTag) {
                     case 'slash':
@@ -107,6 +112,18 @@ function traverse(tree, cb) {
     return tree;
 }
 
+function isSingleTag(tag, strings, regexps) {
+    if (strings[tag]) {
+        return true;
+    }
+    for (var i = 0; i < regexps.length; i++) {
+        if (tag.match(regexps[i])) {
+            return true;
+        }
+    }
+    return false;
+}
+
 var defineAsGlobal = true;
 
 /* istanbul ignore next */

test/test.js

@@ -138,6 +138,10 @@ describe('PostHTML-Render test', function() {
                 expect(render({ tag: 'rect' }, { singleTags: ['rect'] })).to.eql('<rect>');
             });
 
+            it('use regexp', function() {
+                expect(render({ tag: '%=title%' }, { singleTags: [/^%.*%$/] })).to.eql('<%=title%>');
+            });
+
             it('safe attrs', function() {
                 expect(render({ tag: 'rect', attrs: { id: 'id' } }, { singleTags: ['rect'] })).to.eql('<rect id="id">');
             });