simple-xpath-position
Version:
Create and evaluate simple XPath position expressions.
167 lines (141 loc) • 15.9 kB
JavaScript
;
exports.__esModule = true;
exports.fromNode = fromNode;
exports.toNode = toNode;
var _getDocument = require('get-document');
var _getDocument2 = _interopRequireDefault(_getDocument);
var _domException = require('./dom-exception');
var _domException2 = _interopRequireDefault(_domException);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
// https://developer.mozilla.org/en-US/docs/XPathResult
var FIRST_ORDERED_NODE_TYPE = 9;
// Default namespace for XHTML documents
var HTML_NAMESPACE = 'http://www.w3.org/1999/xhtml';
/**
* Compute an XPath expression for the given node.
*
* If the optional parameter `root` is supplied, the computed XPath expression
* will be relative to it. Otherwise, the root element is the root of the
* document to which `node` belongs.
*
* @param {Node} node The node for which to compute an XPath expression.
* @param {Node} [root] The root context for the XPath expression.
* @returns {string}
*/
function fromNode(node) {
var root = arguments.length <= 1 || arguments[1] === undefined ? null : arguments[1];
if (node === undefined) {
throw new Error('missing required parameter "node"');
}
root = root || (0, _getDocument2['default'])(node);
var path = '/';
while (node !== root) {
if (!node) {
var message = 'The supplied node is not contained by the root node.';
var name = 'InvalidNodeTypeError';
throw new _domException2['default'](message, name);
}
path = '/' + nodeName(node) + '[' + nodePosition(node) + ']' + path;
node = node.parentNode;
}
return path.replace(/\/$/, '');
}
/**
* Find a node using an XPath relative to the given root node.
*
* The XPath expressions are evaluated relative to the Node argument `root`.
*
* If the optional parameter `resolver` is supplied, it will be used to resolve
* any namespaces within the XPath.
*
* @param {string} path An XPath String to evaluate.
* @param {Node} root The root context for the XPath expression.
* @returns {Node|null} The first matching Node or null if none is found.
*/
function toNode(path, root) {
var resolver = arguments.length <= 2 || arguments[2] === undefined ? null : arguments[2];
if (path === undefined) {
throw new Error('missing required parameter "path"');
}
if (root === undefined) {
throw new Error('missing required parameter "root"');
}
// Make the path relative to the root, if not the document.
var document = (0, _getDocument2['default'])(root);
if (root !== document) path = path.replace(/^\//, './');
// Make a default resolver.
var documentElement = document.documentElement;
if (resolver === null && documentElement.lookupNamespaceURI) {
(function () {
var defaultNS = documentElement.lookupNamespaceURI(null) || HTML_NAMESPACE;
resolver = function resolver(prefix) {
var ns = { '_default_': defaultNS };
return ns[prefix] || documentElement.lookupNamespaceURI(prefix);
};
})();
}
return resolve(path, root, resolver);
}
// Get the XPath node name.
function nodeName(node) {
switch (node.nodeName) {
case '#text':
return 'text()';
case '#comment':
return 'comment()';
case '#cdata-section':
return 'cdata-section()';
default:
return node.nodeName.toLowerCase();
}
}
// Get the ordinal position of this node among its siblings of the same name.
function nodePosition(node) {
var name = node.nodeName;
var position = 1;
while (node = node.previousSibling) {
if (node.nodeName === name) position += 1;
}
return position;
}
// Find a single node with XPath `path`
function resolve(path, root, resolver) {
try {
// Add a default value to each path part lacking a prefix.
var nspath = path.replace(/\/(?!\.)([^\/:\(]+)(?=\/|$)/g, '/_default_:$1');
return platformResolve(nspath, root, resolver);
} catch (err) {
return fallbackResolve(path, root);
}
}
// Find a single node with XPath `path` using the simple, built-in evaluator.
function fallbackResolve(path, root) {
var steps = path.split("/");
var node = root;
while (node) {
var step = steps.shift();
if (step === undefined) break;
if (step === '.') continue;
var _step$split = step.split(/[\[\]]/);
var name = _step$split[0];
var position = _step$split[1];
name = name.replace('_default_:', '');
position = position ? parseInt(position) : 1;
node = findChild(node, name, position);
}
return node;
}
// Find a single node with XPath `path` using `document.evaluate`.
function platformResolve(path, root, resolver) {
var document = (0, _getDocument2['default'])(root);
var r = document.evaluate(path, root, resolver, FIRST_ORDERED_NODE_TYPE, null);
return r.singleNodeValue;
}
// Find the child of the given node by name and ordinal position.
function findChild(node, name, position) {
for (node = node.firstChild; node; node = node.nextSibling) {
if (nodeName(node) === name && --position === 0) break;
}
return node;
}
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Otherwise, the root element is the root of the\n * document to which `node` belongs.\n *\n * @param {Node} node The node for which to compute an XPath expression.\n * @param {Node} [root] The root context for the XPath expression.\n * @returns {string}\n */\nexport function fromNode(node, root = null) {\n  if (node === undefined) {\n    throw new Error('missing required parameter \"node\"')\n  }\n\n  root = root || getDocument(node)\n\n  let path = '/'\n  while (node !== root) {\n    if (!node) {\n      let message = 'The supplied node is not contained by the root node.'\n      let name = 'InvalidNodeTypeError'\n      throw new DOMException(message, name)\n    }\n    path = `/${nodeName(node)}[${nodePosition(node)}]${path}`\n    node = node.parentNode\n  }\n  return path.replace(/\\/$/, '')\n}\n\n\n/**\n * Find a node using an XPath relative to the given root node.\n *\n * The XPath expressions are evaluated relative to the Node argument `root`.\n *\n * If the optional parameter `resolver` is supplied, it will be used to resolve\n * any namespaces within the XPath.\n *\n * @param {string} path An XPath String to evaluate.\n * @param {Node} root The root context for the XPath expression.\n * @returns {Node|null} The first matching Node or null if none is found.\n */\nexport function toNode(path, root, resolver = null) {\n  if (path === undefined) {\n    throw new Error('missing required parameter \"path\"')\n  }\n  if (root === undefined) {\n    throw new Error('missing required parameter \"root\"')\n  }\n\n  // Make the path relative to the root, if not the document.\n  let document = getDocument(root)\n  if (root !== document) path = path.replace(/^\\//, './')\n\n  // Make a default resolver.\n  let documentElement = document.documentElement\n  if (resolver === null && documentElement.lookupNamespaceURI) {\n    let defaultNS = documentElement.lookupNamespaceURI(null) || HTML_NAMESPACE\n    resolver = (prefix) => {\n      let ns = {'_default_': defaultNS}\n      return ns[prefix] || documentElement.lookupNamespaceURI(prefix)\n    }\n  }\n\n  return resolve(path, root, resolver)\n}\n\n\n// Get the XPath node name.\nfunction nodeName(node) {\n  switch (node.nodeName) {\n  case '#text': return 'text()'\n  case '#comment': return 'comment()'\n  case '#cdata-section': return 'cdata-section()'\n  default: return node.nodeName.toLowerCase()\n  }\n}\n\n\n// Get the ordinal position of this node among its siblings of the same name.\nfunction nodePosition(node) {\n  let name = node.nodeName\n  let position = 1\n  while ((node = node.previousSibling)) {\n    if (node.nodeName === name) position += 1\n  }\n  return position\n}\n\n\n// Find a single node with XPath `path`\nfunction resolve(path, root, resolver) {\n  try {\n    // Add a default value to each path part lacking a prefix.\n    let nspath = path.replace(/\\/(?!\\.)([^\\/:\\(]+)(?=\\/|$)/g, '/_default_:$1')\n    return platformResolve(nspath, root, resolver)\n  } catch (err) {\n    return fallbackResolve(path, root)\n  }\n}\n\n\n// Find a single node with XPath `path` using the simple, built-in evaluator.\nfunction fallbackResolve(path, root) {\n  let steps = path.split(\"/\")\n  let node = root\n  while (node) {\n    let step = steps.shift()\n    if (step === undefined) break\n    if (step === '.') continue\n    let [name, position] = step.split(/[\\[\\]]/)\n    name = name.replace('_default_:', '')\n    position = position ? parseInt(position) : 1\n    node = findChild(node, name, position)\n  }\n  return node\n}\n\n\n// Find a single node with XPath `path` using `document.evaluate`.\nfunction platformResolve(path, root, resolver) {\n  let document = getDocument(root)\n  let r = document.evaluate(path, root, resolver, FIRST_ORDERED_NODE_TYPE, null)\n  return r.singleNodeValue\n}\n\n\n// Find the child of the given node by name and ordinal position.\nfunction findChild(node, name, position) {\n  for (node = node.firstChild ; node ; node = node.nextSibling) {\n    if (nodeName(node) === name && --position === 0) break\n  }\n  return node\n}\n"]}