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JavaScript

"use strict";
const xnv = require("xml-name-validator");
const attributeUtils = require("./attributes");
const { NAMESPACES, VOID_ELEMENTS, NODE_TYPES } = require("./constants");
const XML_CHAR = /^(\x09|\x0A|\x0D|[\x20-\uD7FF]|[\uE000-\uFFFD]|(?:[\uD800-\uDBFF][\uDC00-\uDFFF]))*$/;
const PUBID_CHAR = /^(\x20|\x0D|\x0A|[a-zA-Z0-9]|[-'()+,./:=?;!*#@$_%])*$/;
function asciiCaseInsensitiveMatch(a, b) {
if (a.length !== b.length) {
return false;
}
for (let i = 0; i < a.length; ++i) {
if ((a.charCodeAt(i) | 32) !== (b.charCodeAt(i) | 32)) {
return false;
}
}
return true;
}
function recordNamespaceInformation(element, map, prefixMap) {
let defaultNamespaceAttrValue = null;
for (let i = 0; i < element.attributes.length; ++i) {
const attr = element.attributes[i];
if (attr.namespaceURI === NAMESPACES.XMLNS) {
if (attr.prefix === null) {
defaultNamespaceAttrValue = attr.value;
continue;
}
let namespaceDefinition = attr.value;
if (namespaceDefinition === NAMESPACES.XML) {
continue;
}
// This is exactly the other way than the spec says, but that's intended.
// All the maps coalesce null to the empty string (explained in the
// spec), so instead of doing that every time, just do it once here.
if (namespaceDefinition === null) {
namespaceDefinition = "";
}
if (
namespaceDefinition in map &&
map[namespaceDefinition].includes(attr.localName)
) {
continue;
}
if (!(namespaceDefinition in map)) {
map[namespaceDefinition] = [];
}
map[namespaceDefinition].push(attr.localName);
prefixMap[attr.localName] = namespaceDefinition;
}
}
return defaultNamespaceAttrValue;
}
function serializeDocumentType(node, namespace, prefixMap, requireWellFormed) {
if (requireWellFormed && !PUBID_CHAR.test(node.publicId)) {
throw new Error("Failed to serialize XML: document type node publicId is not well-formed.");
}
if (
requireWellFormed &&
(!XML_CHAR.test(node.systemId) ||
(node.systemId.includes('"') && node.systemId.includes("'")))
) {
throw new Error("Failed to serialize XML: document type node systemId is not well-formed.");
}
let markup = `<!DOCTYPE ${node.name}`;
if (node.publicId !== "") {
markup += ` PUBLIC "${node.publicId}"`;
} else if (node.systemId !== "") {
markup += " SYSTEM";
}
if (node.systemId !== "") {
markup += ` "${node.systemId}"`;
}
return markup + ">";
}
function serializeProcessingInstruction(
node,
namespace,
prefixMap,
requireWellFormed
) {
if (
requireWellFormed &&
(node.target.includes(":") || asciiCaseInsensitiveMatch(node.target, "xml"))
) {
throw new Error("Failed to serialize XML: processing instruction node target is not well-formed.");
}
if (
requireWellFormed &&
(!XML_CHAR.test(node.data) || node.data.includes("?>"))
) {
throw new Error("Failed to serialize XML: processing instruction node data is not well-formed.");
}
return `<?${node.target} ${node.data}?>`;
}
function serializeDocument(
node,
namespace,
prefixMap,
requireWellFormed,
refs
) {
if (requireWellFormed && node.documentElement === null) {
throw new Error("Failed to serialize XML: document does not have a document element.");
}
let serializedDocument = "";
for (const child of node.childNodes) {
serializedDocument += xmlSerialization(
child,
namespace,
prefixMap,
requireWellFormed,
refs
);
}
return serializedDocument;
}
function serializeDocumentFragment(
node,
namespace,
prefixMap,
requireWellFormed,
refs
) {
let markup = "";
for (const child of node.childNodes) {
markup += xmlSerialization(
child,
namespace,
prefixMap,
requireWellFormed,
refs
);
}
return markup;
}
function serializeText(node, namespace, prefixMap, requireWellFormed) {
if (requireWellFormed && !XML_CHAR.test(node.data)) {
throw new Error("Failed to serialize XML: text node data is not well-formed.");
}
return node.data
.replace(/&/g, "&amp;")
.replace(/</g, "&lt;")
.replace(/>/g, "&gt;");
}
function serializeComment(node, namespace, prefixMap, requireWellFormed) {
if (requireWellFormed && !XML_CHAR.test(node.data)) {
throw new Error("Failed to serialize XML: comment node data is not well-formed.");
}
if (
requireWellFormed &&
(node.data.includes("--") || node.data.endsWith("-"))
) {
throw new Error("Failed to serialize XML: found hyphens in illegal places in comment node data.");
}
return `<!--${node.data}-->`;
}
function serializeElement(node, namespace, prefixMap, requireWellFormed, refs) {
if (
requireWellFormed &&
(node.localName.includes(":") || !xnv.name(node.localName))
) {
throw new Error("Failed to serialize XML: element node localName is not a valid XML name.");
}
let markup = "<";
let qualifiedName = "";
let skipEndTag = false;
let ignoreNamespaceDefinitionAttr = false;
const map = Object.assign({}, prefixMap);
const localPrefixesMap = Object.create(null);
const localDefaultNamespace = recordNamespaceInformation(
node,
map,
localPrefixesMap
);
let inheritedNs = namespace;
const ns = node.namespaceURI;
if (inheritedNs === ns) {
if (localDefaultNamespace !== null) {
ignoreNamespaceDefinitionAttr = true;
}
if (ns === NAMESPACES.XML) {
qualifiedName = "xml:" + node.localName;
} else {
qualifiedName = node.localName;
}
markup += qualifiedName;
} else {
let { prefix } = node;
let candidatePrefix = attributeUtils.preferredPrefixString(map, ns, prefix);
if (prefix === "xmlns") {
if (requireWellFormed) {
throw new Error("Failed to serialize XML: element nodes can't have a prefix of \"xmlns\".");
}
candidatePrefix = "xmlns";
}
if (candidatePrefix !== null) {
qualifiedName = candidatePrefix + ":" + node.localName;
if (
localDefaultNamespace !== null &&
localDefaultNamespace !== NAMESPACES.XML
) {
inheritedNs =
localDefaultNamespace === "" ? null : localDefaultNamespace;
}
markup += qualifiedName;
} else if (prefix !== null) {
if (prefix in localPrefixesMap) {
prefix = attributeUtils.generatePrefix(map, ns, refs.prefixIndex++);
}
if (map[ns]) {
map[ns].push(prefix);
} else {
map[ns] = [prefix];
}
qualifiedName = prefix + ":" + node.localName;
markup += `${qualifiedName} xmlns:${prefix}="${attributeUtils.serializeAttributeValue(
ns,
requireWellFormed
)}"`;
if (localDefaultNamespace !== null) {
inheritedNs =
localDefaultNamespace === "" ? null : localDefaultNamespace;
}
} else if (localDefaultNamespace === null || localDefaultNamespace !== ns) {
ignoreNamespaceDefinitionAttr = true;
qualifiedName = node.localName;
inheritedNs = ns;
markup += `${qualifiedName} xmlns="${attributeUtils.serializeAttributeValue(
ns,
requireWellFormed
)}"`;
} else {
qualifiedName = node.localName;
inheritedNs = ns;
markup += qualifiedName;
}
}
markup += attributeUtils.serializeAttributes(
node,
map,
localPrefixesMap,
ignoreNamespaceDefinitionAttr,
requireWellFormed,
refs
);
if (
ns === NAMESPACES.HTML &&
node.childNodes.length === 0 &&
VOID_ELEMENTS.has(node.localName)
) {
markup += " /";
skipEndTag = true;
} else if (ns !== NAMESPACES.HTML && node.childNodes.length === 0) {
markup += "/";
skipEndTag = true;
}
markup += ">";
if (skipEndTag) {
return markup;
}
if (ns === NAMESPACES.HTML && node.localName === "template") {
markup += xmlSerialization(
node.content,
inheritedNs,
map,
requireWellFormed,
refs
);
} else {
for (const child of node.childNodes) {
markup += xmlSerialization(
child,
inheritedNs,
map,
requireWellFormed,
refs
);
}
}
markup += `</${qualifiedName}>`;
return markup;
}
function serializeCDATASection(node) {
return "<![CDATA[" + node.data + "]]>";
}
/**
* @param {{prefixIndex: number}} refs
*/
function xmlSerialization(node, namespace, prefixMap, requireWellFormed, refs) {
switch (node.nodeType) {
case NODE_TYPES.ELEMENT_NODE:
return serializeElement(
node,
namespace,
prefixMap,
requireWellFormed,
refs
);
case NODE_TYPES.DOCUMENT_NODE:
return serializeDocument(
node,
namespace,
prefixMap,
requireWellFormed,
refs
);
case NODE_TYPES.COMMENT_NODE:
return serializeComment(node, namespace, prefixMap, requireWellFormed);
case NODE_TYPES.TEXT_NODE:
return serializeText(node, namespace, prefixMap, requireWellFormed);
case NODE_TYPES.DOCUMENT_FRAGMENT_NODE:
return serializeDocumentFragment(
node,
namespace,
prefixMap,
requireWellFormed,
refs
);
case NODE_TYPES.DOCUMENT_TYPE_NODE:
return serializeDocumentType(
node,
namespace,
prefixMap,
requireWellFormed
);
case NODE_TYPES.PROCESSING_INSTRUCTION_NODE:
return serializeProcessingInstruction(
node,
namespace,
prefixMap,
requireWellFormed
);
case NODE_TYPES.ATTRIBUTE_NODE:
return "";
case NODE_TYPES.CDATA_SECTION_NODE:
return serializeCDATASection(node);
default:
throw new TypeError("Failed to serialize XML: only Nodes can be serialized.");
}
}
module.exports = (root, { requireWellFormed = false } = {}) => {
const namespacePrefixMap = Object.create(null);
namespacePrefixMap["http://www.w3.org/XML/1998/namespace"] = ["xml"];
return xmlSerialization(root, null, namespacePrefixMap, requireWellFormed, {
prefixIndex: 1
});
};