XFA - Create Form DOM in merging template and data trees

- Spec: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.364.2157&rep=rep1&type=pdf#page=171;
  - support for the 2 ways of merging: consumeData and matchTemplate;
  - create additional nodes in template DOM when occur node allows it;
  - support for global values in data DOM.

src/core/xfa/template.js

@@ -13,15 +13,19 @@
  * limitations under the License.
  */
 
-import { $buildXFAObject, NamespaceIds } from "./namespaces.js";
 import {
+  $appendChild,
   $content,
   $finalize,
+  $hasItem,
+  $hasSettableValue,
   $isTransparent,
   $namespaceId,
   $nodeName,
   $onChild,
+  $removeChild,
   $setSetAttributes,
+  $setValue,
   ContentObject,
   Option01,
   OptionObject,
@@ -29,6 +33,7 @@ import {
   XFAObject,
   XFAObjectArray,
 } from "./xfa_object.js";
+import { $buildXFAObject, NamespaceIds } from "./namespaces.js";
 import {
   getBBox,
   getColor,
@@ -44,6 +49,15 @@ import { warn } from "../../shared/util.js";
 
 const TEMPLATE_NS_ID = NamespaceIds.template.id;
 
+function _setValue(templateNode, value) {
+  if (!templateNode.value) {
+    const nodeValue = new Value({});
+    templateNode[$appendChild](nodeValue);
+    templateNode.value = nodeValue;
+  }
+  templateNode.value[$setValue](value);
+}
+
 class AppearanceFilter extends StringObject {
   constructor(attributes) {
     super(TEMPLATE_NS_ID, "appearanceFilter");
@@ -496,6 +510,10 @@ class Caption extends XFAObject {
     this.para = null;
     this.value = null;
   }
+
+  [$setValue](value) {
+    _setValue(this, value);
+  }
 }
 
 class Certificate extends StringObject {
@@ -586,6 +604,10 @@ class Color extends XFAObject {
     this.value = getColor(attributes.value);
     this.extras = null;
   }
+
+  [$hasSettableValue]() {
+    return false;
+  }
 }
 
 class Comb extends XFAObject {
@@ -869,6 +891,10 @@ class Draw extends XFAObject {
     this.value = null;
     this.setProperty = new XFAObjectArray();
   }
+
+  [$setValue](value) {
+    _setValue(this, value);
+  }
 }
 
 class Edge extends XFAObject {
@@ -1045,7 +1071,7 @@ class Event extends XFAObject {
 }
 
 class ExData extends ContentObject {
-  constructor(builder, attributes) {
+  constructor(attributes) {
     super(TEMPLATE_NS_ID, "exData");
     this.contentType = attributes.contentType || "";
     this.href = attributes.href || "";
@@ -1188,6 +1214,32 @@ class ExclGroup extends XFAObject {
     this.field = new XFAObjectArray();
     this.setProperty = new XFAObjectArray();
   }
+
+  [$hasSettableValue]() {
+    return true;
+  }
+
+  [$setValue](value) {
+    for (const field of this.field.children) {
+      if (!field.value) {
+        const nodeValue = new Value({});
+        field[$appendChild](nodeValue);
+        field.value = nodeValue;
+      }
+
+      const nodeBoolean = new BooleanElement({});
+      nodeBoolean[$content] = 0;
+
+      for (const item of field.items.children) {
+        if (item[$hasItem](value)) {
+          nodeBoolean[$content] = 1;
+          break;
+        }
+      }
+
+      field.value[$setValue](nodeBoolean);
+    }
+  }
 }
 
 class Execute extends XFAObject {
@@ -1294,6 +1346,8 @@ class Field extends XFAObject {
     this.extras = null;
     this.font = null;
     this.format = null;
+    // For a choice list, one list is used to have display entries
+    // and the other for the exported values
     this.items = new XFAObjectArray(2);
     this.keep = null;
     this.margin = null;
@@ -1307,6 +1361,10 @@ class Field extends XFAObject {
     this.event = new XFAObjectArray();
     this.setProperty = new XFAObjectArray();
   }
+
+  [$setValue](value) {
+    _setValue(this, value);
+  }
 }
 
 class Fill extends XFAObject {
@@ -1590,6 +1648,15 @@ class Items extends XFAObject {
     this.text = new XFAObjectArray();
     this.time = new XFAObjectArray();
   }
+
+  [$hasItem](value) {
+    return (
+      this.hasOwnProperty(value[$nodeName]) &&
+      this[value[$nodeName]].children.some(
+        node => node[$content] === value[$content]
+      )
+    );
+  }
 }
 
 class Keep extends XFAObject {
@@ -1917,10 +1984,7 @@ class Para extends XFAObject {
       "right",
     ]);
     this.id = attributes.id || "";
-    this.lineHeight = getMeasurement(attributes.lineHeight, [
-      "0pt",
-      "measurement",
-    ]);
+    this.lineHeight = getMeasurement(attributes.lineHeight, "0pt");
     this.marginLeft = getMeasurement(attributes.marginLeft, "0");
     this.marginRight = getMeasurement(attributes.marginRight, "0");
     this.orphans = getInteger({
@@ -2735,6 +2799,26 @@ class Value extends XFAObject {
     this.text = null;
     this.time = null;
   }
+
+  [$setValue](value) {
+    const valueName = value[$nodeName];
+    if (this[valueName] !== null) {
+      this[valueName][$content] = value[$content];
+      return;
+    }
+
+    // Reset all the properties.
+    for (const name of Object.getOwnPropertyNames(this)) {
+      const obj = this[name];
+      if (obj instanceof XFAObject) {
+        this[name] = null;
+        this[$removeChild](obj);
+      }
+    }
+
+    this[value[$nodeName]] = value;
+    this[$appendChild](value);
+  }
 }
 
 class Variables extends XFAObject {
@@ -3225,4 +3309,13 @@ class TemplateNamespace {
   }
 }
 
-export { Template, TemplateNamespace };
+export {
+  BindItems,
+  Field,
+  Items,
+  SetProperty,
+  Template,
+  TemplateNamespace,
+  Text,
+  Value,
+};