XFA -- Add other objects (#12949)

- connectionSet: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.364.2157&rep=rep1&type=pdf#page=969
 - datasets: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.364.2157&rep=rep1&type=pdf#page=1038
  - signature: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.364.2157&rep=rep1&type=pdf#page=1040
  - stylesheet: the same
  - xhtml: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.364.2157&rep=rep1&type=pdf#page=1187

src/core/xfa/xhtml.js

@@ -0,0 +1,225 @@
+/* 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 { $text, XmlObject } from "./xfa_object.js";
+
+const XHTML_NS_ID = NamespaceIds.xhtml.id;
+
+const VALID_STYLES = new Set([
+  "color",
+  "font",
+  "font-family",
+  "font-size",
+  "font-stretch",
+  "font-style",
+  "font-weight",
+  "margin",
+  "margin-bottom",
+  "margin-left",
+  "margin-right",
+  "margin-top",
+  "letter-spacing",
+  "line-height",
+  "orphans",
+  "page-break-after",
+  "page-break-before",
+  "page-break-inside",
+  "tab-interval",
+  "tab-stop",
+  "text-decoration",
+  "text-indent",
+  "vertical-align",
+  "widows",
+  "kerning-mode",
+  "xfa-font-horizontal-scale",
+  "xfa-font-vertical-scale",
+  "xfa-tab-stops",
+]);
+
+function checkStyle(style) {
+  if (!style) {
+    return "";
+  }
+
+  // Remove any non-allowed keys.
+  return style
+    .trim()
+    .split(/\s*;\s*/)
+    .filter(s => !!s)
+    .map(s => s.split(/\s*:\s*/, 2))
+    .filter(([key]) => VALID_STYLES.has(key))
+    .map(kv => kv.join(":"))
+    .join(";");
+}
+
+class A extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "a");
+    this.href = attributes.href || "";
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class B extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "b");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Body extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "body");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Br extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "br");
+    this.style = checkStyle(attributes.style);
+  }
+
+  [$text]() {
+    return "\n";
+  }
+}
+
+class Html extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "html");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class I extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "i");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Li extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "li");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Ol extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "ol");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class P extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "p");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Span extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "span");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Sub extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "sub");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Sup extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "sup");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class Ul extends XmlObject {
+  constructor(attributes) {
+    super(XHTML_NS_ID, "ul");
+    this.style = checkStyle(attributes.style);
+  }
+}
+
+class XhtmlNamespace {
+  static [$buildXFAObject](name, attributes) {
+    if (XhtmlNamespace.hasOwnProperty(name)) {
+      return XhtmlNamespace[name](attributes);
+    }
+    return undefined;
+  }
+
+  static a(attributes) {
+    return new A(attributes);
+  }
+
+  static b(attributes) {
+    return new B(attributes);
+  }
+
+  static body(attributes) {
+    return new Body(attributes);
+  }
+
+  static br(attributes) {
+    return new Br(attributes);
+  }
+
+  static html(attributes) {
+    return new Html(attributes);
+  }
+
+  static i(attributes) {
+    return new I(attributes);
+  }
+
+  static li(attributes) {
+    return new Li(attributes);
+  }
+
+  static ol(attributes) {
+    return new Ol(attributes);
+  }
+
+  static p(attributes) {
+    return new P(attributes);
+  }
+
+  static span(attributes) {
+    return new Span(attributes);
+  }
+
+  static sub(attributes) {
+    return new Sub(attributes);
+  }
+
+  static sup(attributes) {
+    return new Sup(attributes);
+  }
+
+  static ul(attributes) {
+    return new Ul(attributes);
+  }
+}
+
+export { XhtmlNamespace };