XFA - Handle correctly subformSet

- it aims to avoid to loop forever when opening pdf in #13213;
  - the idea is to consider subformSet as inexistent when running in the tree. So if we've subformA > subformSet > subformB then subformB will be visited as a direct child of subformA.

src/core/xfa/html_utils.js

@@ -16,6 +16,7 @@
 import {
   $extra,
   $getParent,
+  $getSubformParent,
   $nodeName,
   $toStyle,
   XFAObject,
@@ -296,7 +297,7 @@ function computeBbox(node, html, availableSpace) {
 }
 
 function fixDimensions(node) {
-  const parent = node[$getParent]();
+  const parent = node[$getSubformParent]();
   if (parent.layout && parent.layout.includes("row")) {
     const extra = parent[$extra];
     const colSpan = node.colSpan;

src/core/xfa/template.js

@@ -25,8 +25,10 @@ import {
   $flushHTML,
   $getAvailableSpace,
   $getChildren,
+  $getContainedChildren,
   $getNextPage,
   $getParent,
+  $getSubformParent,
   $hasItem,
   $hasSettableValue,
   $ids,
@@ -106,6 +108,16 @@ function getRoot(node) {
   return parent;
 }
 
+function* getContainedChildren(node) {
+  for (const child of node[$getChildren]()) {
+    if (child instanceof SubformSet) {
+      yield* child[$getContainedChildren]();
+      continue;
+    }
+    yield child;
+  }
+}
+
 function valueToHtml(value) {
   return HTMLResult.success({
     name: "span",
@@ -338,6 +350,12 @@ class Area extends XFAObject {
     this.subformSet = new XFAObjectArray();
   }
 
+  *[$getContainedChildren]() {
+    // This function is overriden in order to fake that subforms under
+    // this set are in fact under parent subform.
+    yield* getContainedChildren(this);
+  }
+
   [$isTransparent]() {
     return true;
   }
@@ -4077,6 +4095,12 @@ class Subform extends XFAObject {
     this.subformSet = new XFAObjectArray();
   }
 
+  *[$getContainedChildren]() {
+    // This function is overriden in order to fake that subforms under
+    // this set are in fact under parent subform.
+    yield* getContainedChildren(this);
+  }
+
   [$flushHTML]() {
     return flushHTML(this);
   }
@@ -4161,7 +4185,7 @@ class Subform extends XFAObject {
     ]);
 
     if (this.layout.includes("row")) {
-      const columnWidths = this[$getParent]().columnWidths;
+      const columnWidths = this[$getSubformParent]().columnWidths;
       if (Array.isArray(columnWidths) && columnWidths.length > 0) {
         this[$extra].columnWidths = columnWidths;
         this[$extra].currentColumn = 0;
@@ -4292,27 +4316,22 @@ class SubformSet extends XFAObject {
     this.breakBefore = new XFAObjectArray();
     this.subform = new XFAObjectArray();
     this.subformSet = new XFAObjectArray();
+
+    // TODO: need to handle break stuff and relation.
   }
 
-  [$toHTML]() {
-    const children = [];
-    if (!this[$extra]) {
-      this[$extra] = Object.create(null);
+  *[$getContainedChildren]() {
+    // This function is overriden in order to fake that subforms under
+    // this set are in fact under parent subform.
+    yield* getContainedChildren(this);
+  }
+
+  [$getSubformParent]() {
+    let parent = this[$getParent]();
+    while (!(parent instanceof Subform)) {
+      parent = parent[$getParent]();
     }
-    this[$extra].children = children;
-
-    this[$childrenToHTML]({
-      filter: new Set(["subform", "subformSet"]),
-      include: true,
-    });
-
-    return HTMLResult.success({
-      name: "div",
-      children,
-      attributes: {
-        id: this[$uid],
-      },
-    });
+    return parent;
   }
 }
 

src/core/xfa/xfa_object.js

@@ -43,7 +43,9 @@ const $getChildrenByNameIt = Symbol();
 const $getDataValue = Symbol();
 const $getRealChildrenByNameIt = Symbol();
 const $getChildren = Symbol();
+const $getContainedChildren = Symbol();
 const $getNextPage = Symbol();
+const $getSubformParent = Symbol();
 const $getParent = Symbol();
 const $global = Symbol();
 const $hasItem = Symbol();
@@ -255,6 +257,10 @@ class XFAObject {
     return this[_parent];
   }
 
+  [$getSubformParent]() {
+    return this[$getParent]();
+  }
+
   [$getChildren](name = null) {
     if (!name) {
       return this[_children];
@@ -296,8 +302,15 @@ class XFAObject {
     return HTMLResult.EMPTY;
   }
 
-  *[_filteredChildrenGenerator](filter, include) {
+  *[$getContainedChildren]() {
+    // This function is overriden in Subform and SubformSet.
     for (const node of this[$getChildren]()) {
+      yield node;
+    }
+  }
+
+  *[_filteredChildrenGenerator](filter, include) {
+    for (const node of this[$getContainedChildren]()) {
       if (!filter || include === filter.has(node[$nodeName])) {
         const availableSpace = this[$getAvailableSpace]();
         const res = node[$toHTML](availableSpace);
@@ -965,10 +978,12 @@ export {
   $getChildrenByClass,
   $getChildrenByName,
   $getChildrenByNameIt,
+  $getContainedChildren,
   $getDataValue,
   $getNextPage,
   $getParent,
   $getRealChildrenByNameIt,
+  $getSubformParent,
   $global,
   $hasItem,
   $hasSettableValue,

test/pdfs/xfa_issue13213.pdf.link

@@ -0,0 +1 @@
+https://github.com/mozilla/pdf.js/files/6290046/cerfa_12156-05.pdf

test/test_manifest.json

@@ -938,6 +938,14 @@
        "enableXfa": true,
        "type": "eq"
     },
+    {  "id": "xfa_issue13213",
+       "file": "pdfs/xfa_issue13213.pdf",
+       "md5": "8a0e3179bffbac721589d1b1df863b49",
+       "link": true,
+       "rounds": 1,
+       "enableXfa": true,
+       "type": "eq"
+    },
     {  "id": "issue10272",
        "file": "pdfs/issue10272.pdf",
        "md5": "bf3b2f74c6878d38a70dc0825f1b9a02",