XFA - Create Form DOM in merging template and data trees

src/core/xfa/builder.js

@@ -17,6 +17,7 @@ import { $buildXFAObject, NamespaceIds } from "./namespaces.js";
 import {
   $cleanup,
   $finalize,
+  $nsAttributes,
   $onChild,
   $resolvePrototypes,
   XFAObject,
@@ -88,6 +89,25 @@ class Builder {
       this._addNamespacePrefix(prefixes);
     }
 
+    if (attributes.hasOwnProperty($nsAttributes)) {
+      // Only support xfa-data namespace.
+      const dataTemplate = NamespaceSetUp.datasets;
+      const nsAttrs = attributes[$nsAttributes];
+      let xfaAttrs = null;
+      for (const [ns, attrs] of Object.entries(nsAttrs)) {
+        const nsToUse = this._getNamespaceToUse(ns);
+        if (nsToUse === dataTemplate) {
+          xfaAttrs = { xfa: attrs };
+          break;
+        }
+      }
+      if (xfaAttrs) {
+        attributes[$nsAttributes] = xfaAttrs;
+      } else {
+        delete attributes[$nsAttributes];
+      }
+    }
+
     const namespaceToUse = this._getNamespaceToUse(nsPrefix);
     const node =
       (namespaceToUse && namespaceToUse[$buildXFAObject](name, attributes)) ||

src/core/xfa/datasets.js

@@ -13,14 +13,16 @@
  * limitations under the License.
  */
 
-import { $buildXFAObject, NamespaceIds } from "./namespaces.js";
 import {
+  $appendChild,
+  $global,
   $namespaceId,
   $nodeName,
-  $onChildCheck,
+  $onChild,
   XFAObject,
   XmlObject,
 } from "./xfa_object.js";
+import { $buildXFAObject, NamespaceIds } from "./namespaces.js";
 
 const DATASETS_NS_ID = NamespaceIds.datasets.id;
 
@@ -37,15 +39,18 @@ class Datasets extends XFAObject {
     this.Signature = null;
   }
 
-  [$onChildCheck](child) {
+  [$onChild](child) {
     const name = child[$nodeName];
-    if (name === "data") {
-      return child[$namespaceId] === DATASETS_NS_ID;
-    }
-    if (name === "Signature") {
-      return child[$namespaceId] === NamespaceIds.signature.id;
+    if (
+      (name === "data" && child[$namespaceId] === DATASETS_NS_ID) ||
+      (name === "Signature" &&
+        child[$namespaceId] === NamespaceIds.signature.id)
+    ) {
+      this[name] = child;
+    } else {
+      child[$global] = true;
     }
-    return false;
+    this[$appendChild](child);
   }
 }
 

src/core/xfa/factory.js

@@ -0,0 +1,33 @@
+/* Copyright 2021 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Binder } from "./bind.js";
+import { XFAParser } from "./parser.js";
+
+class XFAFactory {
+  constructor(data) {
+    this.root = new XFAParser().parse(XFAFactory._createDocument(data));
+    this.form = new Binder(this.root).bind();
+  }
+
+  static _createDocument(data) {
+    if (!data["/xdp:xdp"]) {
+      return data["xdp:xdp"];
+    }
+    return Object.values(data).join("");
+  }
+}
+
+export { XFAFactory };

src/core/xfa/parser.js

@@ -13,7 +13,14 @@
  * limitations under the License.
  */
 
-import { $clean, $finalize, $onChild, $onText, $setId } from "./xfa_object.js";
+import {
+  $clean,
+  $finalize,
+  $nsAttributes,
+  $onChild,
+  $onText,
+  $setId,
+} from "./xfa_object.js";
 import { XMLParserBase, XMLParserErrorCode } from "../xml_parser.js";
 import { Builder } from "./builder.js";
 import { warn } from "../../shared/util.js";
@@ -57,7 +64,7 @@ class XFAParser extends XMLParserBase {
     // namespaces information.
     let namespace = null;
     let prefixes = null;
-    const attributeObj = Object.create(null);
+    const attributeObj = Object.create({});
     for (const { name, value } of attributes) {
       if (name === "xmlns") {
         if (!namespace) {
@@ -72,7 +79,23 @@ class XFAParser extends XMLParserBase {
         }
         prefixes.push({ prefix, value });
       } else {
-        attributeObj[name] = value;
+        const i = name.indexOf(":");
+        if (i === -1) {
+          attributeObj[name] = value;
+        } else {
+          // Attributes can have their own namespace.
+          // For example in data, we can have <foo xfa:dataNode="dataGroup"/>
+          let nsAttrs = attributeObj[$nsAttributes];
+          if (!nsAttrs) {
+            nsAttrs = attributeObj[$nsAttributes] = Object.create(null);
+          }
+          const [ns, attrName] = [name.slice(0, i), name.slice(i + 1)];
+          let attrs = nsAttrs[ns];
+          if (!attrs) {
+            attrs = nsAttrs[ns] = Object.create(null);
+          }
+          attrs[attrName] = value;
+        }
       }
     }
 

src/core/xfa/som.js

@@ -14,11 +14,14 @@
  */
 
 import {
+  $appendChild,
   $getChildrenByClass,
   $getChildrenByName,
   $getParent,
+  $namespaceId,
   XFAObject,
   XFAObjectArray,
+  XmlObject,
 } from "./xfa_object.js";
 import { warn } from "../../shared/util.js";
 
@@ -33,17 +36,18 @@ const operators = {
 };
 
 const shortcuts = new Map([
-  ["$data", root => root.datasets.data],
-  ["$template", root => root.template],
-  ["$connectionSet", root => root.connectionSet],
-  ["$form", root => root.form],
-  ["$layout", root => root.layout],
-  ["$host", root => root.host],
-  ["$dataWindow", root => root.dataWindow],
-  ["$event", root => root.event],
-  ["!", root => root.datasets],
-  ["$xfa", root => root],
-  ["xfa", root => root],
+  ["$data", (root, current) => root.datasets.data],
+  ["$template", (root, current) => root.template],
+  ["$connectionSet", (root, current) => root.connectionSet],
+  ["$form", (root, current) => root.form],
+  ["$layout", (root, current) => root.layout],
+  ["$host", (root, current) => root.host],
+  ["$dataWindow", (root, current) => root.dataWindow],
+  ["$event", (root, current) => root.event],
+  ["!", (root, current) => root.datasets],
+  ["$xfa", (root, current) => root],
+  ["xfa", (root, current) => root],
+  ["$", (root, current) => current],
 ]);
 
 const somCache = new WeakMap();
@@ -138,17 +142,24 @@ function parseExpression(expr, dotDotAllowed) {
   return parsed;
 }
 
-function searchNode(root, container, expr, dotDotAllowed = true) {
+function searchNode(
+  root,
+  container,
+  expr,
+  dotDotAllowed = true,
+  useCache = true
+) {
   const parsed = parseExpression(expr, dotDotAllowed);
   if (!parsed) {
     return null;
   }
+
   const fn = shortcuts.get(parsed[0].name);
   let i = 0;
   let isQualified;
   if (fn) {
     isQualified = true;
-    root = [fn(root)];
+    root = [fn(root, container)];
     i = 1;
   } else {
     isQualified = container === null;
@@ -163,13 +174,17 @@ function searchNode(root, container, expr, dotDotAllowed = true) {
         continue;
       }
 
-      let cached = somCache.get(node);
-      if (!cached) {
-        cached = new Map();
-        somCache.set(node, cached);
+      let children, cached;
+
+      if (useCache) {
+        cached = somCache.get(node);
+        if (!cached) {
+          cached = new Map();
+          somCache.set(node, cached);
+        }
+        children = cached.get(cacheName);
       }
 
-      let children = cached.get(cacheName);
       if (!children) {
         switch (operator) {
           case operators.dot:
@@ -189,7 +204,9 @@ function searchNode(root, container, expr, dotDotAllowed = true) {
           default:
             break;
         }
-        cached.set(cacheName, children);
+        if (useCache) {
+          cached.set(cacheName, children);
+        }
       }
 
       if (children.length > 0) {
@@ -222,11 +239,72 @@ function searchNode(root, container, expr, dotDotAllowed = true) {
     return null;
   }
 
-  if (root.length === 1) {
-    return root[0];
+  return root;
+}
+
+function createNodes(root, path) {
+  let node = null;
+  for (const { name, index } of path) {
+    for (let i = 0; i <= index; i++) {
+      node = new XmlObject(root[$namespaceId], name);
+      root[$appendChild](node);
+    }
+
+    root = node;
   }
+  return node;
+}
 
-  return root;
+function createDataNode(root, container, expr) {
+  const parsed = parseExpression(expr);
+  if (!parsed) {
+    return null;
+  }
+
+  if (parsed.some(x => x.operator === operators.dotDot)) {
+    return null;
+  }
+
+  const fn = shortcuts.get(parsed[0].name);
+  let i = 0;
+  if (fn) {
+    root = fn(root, container);
+    i = 1;
+  } else {
+    root = container || root;
+  }
+
+  for (let ii = parsed.length; i < ii; i++) {
+    const { cacheName, index } = parsed[i];
+    if (!isFinite(index)) {
+      parsed[i].index = 0;
+      return createNodes(root, parsed.slice(i));
+    }
+
+    const cached = somCache.get(root);
+    if (!cached) {
+      warn(`XFA - createDataNode must be called after searchNode.`);
+      return null;
+    }
+
+    const children = cached.get(cacheName);
+    if (children.length === 0) {
+      return createNodes(root, parsed.slice(i));
+    }
+
+    if (index < children.length) {
+      const child = children[index];
+      if (!(child instanceof XFAObject)) {
+        warn(`XFA - Cannot create a node.`);
+        return null;
+      }
+      root = child;
+    } else {
+      parsed[i].index = children.length - index;
+      return createNodes(root, parsed.slice(i));
+    }
+  }
+  return null;
 }
 
-export { searchNode };
+export { createDataNode, searchNode };