Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/w3c-xmlserializer/lib/attributes.js

@@ -0,0 +1,128 @@
+"use strict";
+
+const xnv = require("xml-name-validator");
+
+const { NAMESPACES } = require("./constants");
+
+function generatePrefix(map, newNamespace, prefixIndex) {
+  const generatedPrefix = "ns" + prefixIndex;
+  map[newNamespace] = [generatedPrefix];
+  return generatedPrefix;
+}
+
+function preferredPrefixString(map, ns, preferredPrefix) {
+  const candidateList = map[ns];
+  if (!candidateList) {
+    return null;
+  }
+  if (candidateList.includes(preferredPrefix)) {
+    return preferredPrefix;
+  }
+  return candidateList[candidateList.length - 1];
+}
+
+function serializeAttributeValue(value/* , requireWellFormed*/) {
+  if (value === null) {
+    return "";
+  }
+  // TODO: Check well-formedness
+  return value
+    .replace(/&/g, "&")
+    .replace(/"/g, """)
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/\t/g, "&#x9;")
+    .replace(/\n/g, "&#xA;")
+    .replace(/\r/g, "&#xD;");
+}
+
+function serializeAttributes(
+  element,
+  map,
+  localPrefixes,
+  ignoreNamespaceDefAttr,
+  requireWellFormed,
+  refs
+) {
+  let result = "";
+  const namespaceLocalnames = Object.create(null);
+  for (const attr of element.attributes) {
+    if (
+      requireWellFormed &&
+      namespaceLocalnames[attr.namespaceURI] &&
+      namespaceLocalnames[attr.namespaceURI].has(attr.localName)
+    ) {
+      throw new Error("Found duplicated attribute");
+    }
+    if (!namespaceLocalnames[attr.namespaceURI]) {
+      namespaceLocalnames[attr.namespaceURI] = new Set();
+    }
+    namespaceLocalnames[attr.namespaceURI].add(attr.localName);
+    const attributeNamespace = attr.namespaceURI;
+    let candidatePrefix = null;
+    if (attributeNamespace !== null) {
+      candidatePrefix = preferredPrefixString(
+        map,
+        attributeNamespace,
+        attr.prefix
+      );
+      if (attributeNamespace === NAMESPACES.XMLNS) {
+        if (
+          attr.value === NAMESPACES.XML ||
+          (attr.prefix === null && ignoreNamespaceDefAttr) ||
+          (attr.prefix !== null &&
+            localPrefixes[attr.localName] !== attr.value &&
+            map[attr.value].includes(attr.localName))
+        ) {
+          continue;
+        }
+        if (requireWellFormed && attr.value === NAMESPACES.XMLNS) {
+          throw new Error(
+            "The XMLNS namespace is reserved and cannot be applied as an element's namespace via XML parsing"
+          );
+        }
+        if (requireWellFormed && attr.value === "") {
+          throw new Error(
+            "Namespace prefix declarations cannot be used to undeclare a namespace"
+          );
+        }
+        if (attr.prefix === "xmlns") {
+          candidatePrefix = "xmlns";
+        }
+      } else if (candidatePrefix === null) {
+        candidatePrefix = generatePrefix(
+          map,
+          attributeNamespace,
+          refs.prefixIndex++
+        );
+        result += ` xmlns:${candidatePrefix}="${serializeAttributeValue(
+          attributeNamespace,
+          requireWellFormed
+        )}"`;
+      }
+    }
+
+    result += " ";
+    if (candidatePrefix !== null) {
+      result += candidatePrefix + ":";
+    }
+    if (
+      requireWellFormed &&
+      (attr.localName.includes(":") ||
+        !xnv.name(attr.localName) ||
+        (attr.localName === "xmlns" && attributeNamespace === null))
+    ) {
+      throw new Error("Invalid attribute localName value");
+    }
+    result += `${attr.localName}="${serializeAttributeValue(
+      attr.value,
+      requireWellFormed
+    )}"`;
+  }
+  return result;
+}
+
+module.exports.preferredPrefixString = preferredPrefixString;
+module.exports.generatePrefix = generatePrefix;
+module.exports.serializeAttributeValue = serializeAttributeValue;
+module.exports.serializeAttributes = serializeAttributes;