Fix plugins order (#1334)

Ref https://github.com/svg/svgo/issues/1333

While refactoring broke plugin order.

lib/svgo/plugins.js

@@ -11,31 +11,30 @@
  * @return {Object} output data
  */
 module.exports = function(data, info, plugins) {
-  const perItemPlugins = [];
-  const perItemReversePlugins = [];
-  const fullPlugins = [];
   // Try to group sequential elements of plugins array
+  // to optimize ast traversing
+  const groups = [];
+  let prev;
   for (const plugin of plugins) {
-    switch(plugin.type) {
-      case 'perItem':
-        perItemPlugins.push(plugin);
-        break;
-      case 'perItemReverse':
-        perItemReversePlugins.push(plugin);
-        break;
-      case 'full':
-        fullPlugins.push(plugin);
-        break;
+    if (prev && plugin.type == prev[0].type) {
+      prev.push(plugin);
+    } else {
+      prev = [plugin];
+      groups.push(prev);
     }
   }
-  if (perItemPlugins.length !== 0) {
-    data = perItem(data, info, perItemPlugins);
-  }
-  if (perItemReversePlugins.length !== 0) {
-    data = perItem(data, info, perItemReversePlugins, true);
-  }
-  if (fullPlugins.length !== 0) {
-    data = full(data, info, fullPlugins);
+  for (const group of groups) {
+    switch(group[0].type) {
+      case 'perItem':
+        data = perItem(data, info, group);
+        break;
+      case 'perItemReverse':
+        data = perItem(data, info, group, true);
+        break;
+      case 'full':
+        data = full(data, info, group);
+        break;
+    }
   }
   return data;
 };

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "svgo",
-  "version": "1.3.2",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

test/svgo/_index.js

@@ -46,4 +46,9 @@ describe('svgo', () => {
       });
       expect(normalize(result.data)).to.equal(expected);
   });
+  it('should handle plugins order properly', async () => {
+    const [original, expected] = await parseFixture('plugins-order.svg');
+      const result = optimize(original, { input: 'file', path: 'input.svg' });
+      expect(normalize(result.data)).to.equal(expected);
+  });
 });

test/svgo/multipass.svg

@@ -1,7 +1,7 @@
 <!-- https://github.com/svg/svgo/pull/258#issue-23706813 -->
 <svg xmlns="http://www.w3.org/2000/svg">
   <g transform="translate(-39, -239)">
-    <g id="test" class="test" transform="translate(39, 37)">
+    <g id="test" transform="translate(39, 37)">
       <g>
         <rect id="Rectangle-1183" fill="#D4D4D4" x="8" y="223" width="7" height="19"></rect>
         <rect id="Rectangle-1183" fill="#D4D4D4" x="4" y="227" width="42" height="3"></rect>

test/svgo/plugins-order.svg

@@ -0,0 +1,11 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" viewBox="0 0 733 801">
+  <path d="M375.6,443.1"/>
+  <path d="M289,397.4c7.7,24.8,7.8,47.3,7.8,47.3l-2.2,1.6l-6.7,8.1l-2,7.7l1.1,5.4l4.7,4.7l6.4,4.3l9.3,3.5l12.1,1.2
+  l23.8-2.4l15.3-6.4l7.4-5.5h0.2l7.9-7.3l3.4-8.3l-2.1-8.3l-4.6-5.2l-1.9-0.5v-0.1l9.3-44.4c77.3-50.5,85.1-214.5,85.1-214.5
+  s2.1-40.8-0.7-44c-2.8-3.2-28.1-38.7-28.1-38.7l-67.7-18l-82,6L233.7,97l-15.2,59.8l-2.2,15.5C216.3,172.3,208.4,352.8,289,397.4z"
+  />
+</svg>
+
+@@@
+
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 733 801"><path d="M289 397.4c7.7 24.8 7.8 47.3 7.8 47.3l-2.2 1.6-6.7 8.1-2 7.7 1.1 5.4 4.7 4.7 6.4 4.3 9.3 3.5 12.1 1.2 23.8-2.4 15.3-6.4 7.4-5.5h.2l7.9-7.3 3.4-8.3-2.1-8.3-4.6-5.2-1.9-.5v-.1l9.3-44.4c77.3-50.5 85.1-214.5 85.1-214.5s2.1-40.8-.7-44c-2.8-3.2-28.1-38.7-28.1-38.7l-67.7-18-82 6L233.7 97l-15.2 59.8-2.2 15.5s-7.9 180.5 72.7 225.1z"/></svg>