XFA - Remove namespace from nodes under xfa:data node

- in real life some xfa contains xml like <xfa:data><xfa:Foo><xfa:Bar>...</xfa:data>
    since there are no Foo or Bar in the xfa namespace the JS representation are empty
    and that leads to errors.
  - so the idea is to make all nodes under xfa:data namespace agnostic which means
    that ns are removed from nodes in the parser but only xfa:data descendants.

src/core/xfa/builder.js

@@ -18,6 +18,7 @@ import {
   $cleanup,
   $finalize,
   $ids,
+  $isNsAgnostic,
   $nsAttributes,
   $onChild,
   $resolvePrototypes,
@@ -67,6 +68,7 @@ class Empty extends XFAObject {
 class Builder {
   constructor() {
     this._namespaceStack = [];
+    this._nsAgnosticLevel = 0;
 
     // Each prefix has its own stack
     this._namespacePrefixes = new Map();
@@ -118,18 +120,27 @@ class Builder {
       (namespaceToUse && namespaceToUse[$buildXFAObject](name, attributes)) ||
       new Empty();
 
+    if (node[$isNsAgnostic]()) {
+      this._nsAgnosticLevel++;
+    }
+
     // In case the node has some namespace things,
     // we must pop the different stacks.
-    if (hasNamespaceDef || prefixes) {
+    if (hasNamespaceDef || prefixes || node[$isNsAgnostic]()) {
       node[$cleanup] = {
         hasNamespace: hasNamespaceDef,
         prefixes,
+        nsAgnostic: node[$isNsAgnostic](),
       };
     }
 
     return node;
   }
 
+  isNsAgnostic() {
+    return this._nsAgnosticLevel > 0;
+  }
+
   _searchNamespace(nsName) {
     let ns = this._namespaces.get(nsName);
     if (ns) {
@@ -178,7 +189,7 @@ class Builder {
   }
 
   clean(data) {
-    const { hasNamespace, prefixes } = data;
+    const { hasNamespace, prefixes, nsAgnostic } = data;
     if (hasNamespace) {
       this._currentNamespace = this._namespaceStack.pop();
     }
@@ -187,6 +198,9 @@ class Builder {
         this._namespacePrefixes.get(prefix).pop();
       });
     }
+    if (nsAgnostic) {
+      this._nsAgnosticLevel--;
+    }
   }
 }
 

src/core/xfa/datasets.js

@@ -15,6 +15,7 @@
 
 import {
   $appendChild,
+  $isNsAgnostic,
   $namespaceId,
   $nodeName,
   $onChild,
@@ -29,6 +30,10 @@ class Data extends XmlObject {
   constructor(attributes) {
     super(DATASETS_NS_ID, "data", attributes);
   }
+
+  [$isNsAgnostic]() {
+    return true;
+  }
 }
 
 class Datasets extends XFAObject {

src/core/xfa/parser.js

@@ -118,12 +118,12 @@ class XFAParser extends XMLParserBase {
     return [namespace, prefixes, attributeObj];
   }
 
-  _getNameAndPrefix(name) {
+  _getNameAndPrefix(name, nsAgnostic) {
     const i = name.indexOf(":");
     if (i === -1) {
       return [name, null];
     }
-    return [name.substring(i + 1), name.substring(0, i)];
+    return [name.substring(i + 1), nsAgnostic ? "" : name.substring(0, i)];
   }
 
   onBeginElement(tagName, attributes, isEmpty) {
@@ -131,7 +131,10 @@ class XFAParser extends XMLParserBase {
       attributes,
       tagName
     );
-    const [name, nsPrefix] = this._getNameAndPrefix(tagName);
+    const [name, nsPrefix] = this._getNameAndPrefix(
+      tagName,
+      this._builder.isNsAgnostic()
+    );
     const node = this._builder.build({
       nsPrefix,
       name,

src/core/xfa/xfa_object.js

@@ -60,6 +60,7 @@ const $isCDATAXml = Symbol();
 const $isBindable = Symbol();
 const $isDataValue = Symbol();
 const $isDescendent = Symbol();
+const $isNsAgnostic = Symbol();
 const $isSplittable = Symbol();
 const $isThereMoreWidth = Symbol();
 const $isTransparent = Symbol();
@@ -160,6 +161,10 @@ class XFAObject {
     );
   }
 
+  [$isNsAgnostic]() {
+    return false;
+  }
+
   [$acceptWhitespace]() {
     return false;
   }
@@ -1087,6 +1092,7 @@ export {
   $isCDATAXml,
   $isDataValue,
   $isDescendent,
+  $isNsAgnostic,
   $isSplittable,
   $isThereMoreWidth,
   $isTransparent,

test/pdfs/xfa_bug1721600.pdf.link

@@ -0,0 +1 @@
+https://bugzilla.mozilla.org/attachment.cgi?id=9232367

test/test_manifest.json

@@ -952,6 +952,15 @@
        "enableXfa": true,
        "type": "eq"
     },
+    {  "id": "xfa_bug1721600",
+       "file": "pdfs/xfa_bug1721600.pdf",
+       "md5": "5f514f476169eeb7254da380a8db495a",
+       "link": true,
+       "rounds": 1,
+       "lastPage": 1,
+       "enableXfa": true,
+       "type": "eq"
+    },
     {  "id": "xfa_bug1720182",
        "file": "pdfs/xfa_bug1720182.pdf",
        "md5": "1351f816f0509fe750ca61ef2bd40872",