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retrieve a CSS selector out of a DOM node
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(function () { | |
var all = document.getElementsByTagName('*') | |
, matches = 0 | |
, misses = 0 | |
, total = all.length | |
, i = all.length | |
, selector | |
, match; | |
while (i--) { | |
selector = document.retrieveSelector(all[i]); | |
match = document.querySelector(selector); | |
if (all[i] !== match) { | |
misses++; | |
console.log('Failed', selector, match, all[i]); | |
} else { | |
matches++; | |
} | |
} | |
console.log('Misses: %d, Matches: %d, Total: %d', misses, matches, total); | |
})(); |
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document.retrieveSelector = (function (filter) { | |
// (C) WebReflection - Mit Style License | |
function elementsOnly(element) { | |
return element.nodeType == 1; | |
} | |
function createSelector(element, documentElement, path, first) { | |
var | |
nodeName = element.nodeName, | |
parentNode = element.parentNode | |
; | |
switch (true) { | |
case !!element.id: | |
path.push("#" + element.id); | |
break; | |
case first: | |
first = !first; | |
nodeName += ":nth-child(" + ( | |
1 + filter.call(parentNode.childNodes, elementsOnly).indexOf(element) | |
) + ")"; | |
case element != documentElement: | |
createSelector(parentNode, documentElement, path); | |
default: | |
path.push(nodeName); | |
break; | |
} | |
return path; | |
} | |
// partial polyfill for this code purpose only | |
filter || (filter = function () { | |
function indexOf(o) { // node always unique | |
for (var i = this.length; i-- && this[i] !== o;); | |
return i; | |
} | |
return function (fn) { | |
for (var r = [], i = 0, length = this.length; i < length; i++) { | |
fn(this[i]) && r.push(this[i]); | |
} | |
r.indexOf = indexOf; | |
return r; | |
}; | |
}()); | |
return function retrieveSelector(element) { | |
var ownerDocument = element.ownerDocument; | |
return ownerDocument ? createSelector( | |
element.nodeType != 1 ? element.parentNode : element, | |
ownerDocument.documentElement, | |
[], | |
true | |
).join(">") : ""; | |
}; | |
}([].filter)); |
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