XFA - Add a parser for XFA files

- the parser is base on a class extending XMLParserBase
 - it handle xml namespaces:
   * each namespace is assocated with a builder
   * builder builds nodes belonging to the namespace
   * when a node is inserted in the parent namespace compatibility is checked (if required)
 - to avoid name collision between xml names and object properties, use Symbol.

src/core/xfa/config.js

@@ -0,0 +1,193 @@
+/* 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 { $buildXFAObject, NamespaceIds } from "./namespaces.js";
+import {
+  IntegerObject,
+  OptionObject,
+  StringObject,
+  XFAObject,
+} from "./xfa_object.js";
+
+const CONFIG_NS_ID = NamespaceIds.config.id;
+
+class Acrobat extends XFAObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "acrobat", /* hasChildren = */ true);
+    this.acrobat7 = null;
+    this.autoSave = null;
+    this.common = null;
+    this.validate = null;
+    this.validateApprovalSignatures = null;
+    this.submitUrl = [];
+  }
+}
+
+class Acrobat7 extends XFAObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "acrobat7", /* hasChildren = */ true);
+    this.dynamicRender = null;
+  }
+}
+
+class AdobeExtensionLevel extends IntegerObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "adobeExtensionLevel", 0, n => n >= 1 && n <= 8);
+  }
+}
+
+class AutoSave extends OptionObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "autoSave", ["disabled", "enabled"]);
+  }
+}
+
+class Config extends XFAObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "config", /* hasChildren = */ true);
+    this.acrobat = null;
+    this.present = null;
+    this.trace = null;
+    this.agent = [];
+  }
+}
+
+class DynamicRender extends OptionObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "dynamicRender", ["forbidden", "required"]);
+  }
+}
+
+class Present extends XFAObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "present", /* hasChildren = */ true);
+    this.behaviorOverride = null;
+    this.cache = null;
+    this.common = null;
+    this.copies = null;
+    this.destination = null;
+    this.incrementalMerge = null;
+    this.layout = null;
+    this.output = null;
+    this.overprint = null;
+    this.pagination = null;
+    this.paginationOverride = null;
+    this.script = null;
+    this.validate = null;
+    this.xdp = null;
+    this.driver = [];
+    this.labelPrinter = [];
+    this.pcl = [];
+    this.pdf = [];
+    this.ps = [];
+    this.submitUrl = [];
+    this.webClient = [];
+    this.zpl = [];
+  }
+}
+
+class Pdf extends XFAObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "pdf", /* hasChildren = */ true);
+    this.name = attributes.name || "";
+    this.adobeExtensionLevel = null;
+    this.batchOutput = null;
+    this.compression = null;
+    this.creator = null;
+    this.encryption = null;
+    this.fontInfo = null;
+    this.interactive = null;
+    this.linearized = null;
+    this.openAction = null;
+    this.pdfa = null;
+    this.producer = null;
+    this.renderPolicy = null;
+    this.scriptModel = null;
+    this.silentPrint = null;
+    this.submitFormat = null;
+    this.tagged = null;
+    this.version = null;
+    this.viewerPreferences = null;
+    this.xdc = null;
+  }
+}
+
+class SubmitUrl extends StringObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "submitUrl");
+  }
+}
+
+class Validate extends OptionObject {
+  constructor(attributes) {
+    super(CONFIG_NS_ID, "validate", [
+      "preSubmit",
+      "prePrint",
+      "preExecute",
+      "preSave",
+    ]);
+  }
+}
+
+class ConfigNamespace {
+  static [$buildXFAObject](name, attributes) {
+    if (ConfigNamespace.hasOwnProperty(name)) {
+      return ConfigNamespace[name](attributes);
+    }
+    return undefined;
+  }
+
+  static acrobat(attrs) {
+    return new Acrobat(attrs);
+  }
+
+  static acrobat7(attrs) {
+    return new Acrobat7(attrs);
+  }
+
+  static adobeExtensionLevel(attrs) {
+    return new AdobeExtensionLevel(attrs);
+  }
+
+  static autoSave(attrs) {
+    return new AutoSave(attrs);
+  }
+
+  static config(attrs) {
+    return new Config(attrs);
+  }
+
+  static dynamicRender(attrs) {
+    return new DynamicRender(attrs);
+  }
+
+  static pdf(attrs) {
+    return new Pdf(attrs);
+  }
+
+  static present(attrs) {
+    return new Present(attrs);
+  }
+
+  static submitUrl(attrs) {
+    return new SubmitUrl(attrs);
+  }
+
+  static validate(attrs) {
+    return new Validate(attrs);
+  }
+}
+
+export { ConfigNamespace };