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node_modules/nwmatcher/src/modules/nwmatcher-traversal.js
Maintainability
62.45
Lines of code
85
Difficulty
34.20
Estimated Errors
0.50
Function weight
By Complexity
By SLOC
/* * Element Traversal methods from Juriy Zaytsev (kangax) * used to emulate Prototype up/down/previous/next methods */ (function(D){ // TODO: all of this needs tests var match = D.match, select = D.select, root = document.documentElement, // Use the Element Traversal API if available. nextElement = 'nextElementSibling', previousElement = 'previousElementSibling', parentElement = 'parentElement'; // Fall back to the DOM Level 1 API. if (!(nextElement in root)) nextElement = 'nextSibling'; if (!(previousElement in root)) previousElement = 'previousSibling'; if (!(parentElement in root)) parentElement = 'parentNode'; function walkElements(property, element, expr) { var i = 0, isIndex = typeof expr == 'number'; if (typeof expr == 'undefined') { isIndex = true; expr = 0; } while ((element = element[property])) { if (element.nodeType != 1) continue; if (isIndex) { ++i; if (i == expr) return element; } else if (match(element, expr)) { return element; } } return null; } /** * @method up * @param {HTMLElement} element element to walk from * @param {String | Number} expr CSS expression or an index * @return {HTMLElement | null} */ function up(element, expr) { return walkElements(parentElement, element, expr); } /** * @method next * @param {HTMLElement} element element to walk from * @param {String | Number} expr CSS expression or an index * @return {HTMLElement | null} */ function next(element, expr) { return walkElements(nextElement, element, expr); } /** * @method previous * @param {HTMLElement} element element to walk from * @param {String | Number} expr CSS expression or an index * @return {HTMLElement | null} */ function previous(element, expr) { return walkElements(previousElement, element, expr); } /** * @method down * @param {HTMLElement} element element to walk from * @param {String | Number} expr CSS expression or an index * @return {HTMLElement | null} */ function down(element, expr) { var isIndex = typeof expr == 'number', descendants, index, descendant; if (expr === null) { element = element.firstChild; while (element && element.nodeType != 1) element = element[nextElement]; return element; } if (!isIndex && match(element, expr) || isIndex && expr === 0) return element; descendants = select('*', element); if (isIndex) return descendants[expr] || null; index = 0; while ((descendant = descendants[index]) && !match(descendant, expr)) { ++index; } return descendant || null; } D.up = up; D.down = down; D.next = next; D.previous = previous; })(NW.Dom);