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Code Issues Releases Wiki Activity

fix https://github.com/uBlockOrigin/uBlock-issues/issues/17

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Raymond Hill 2018-04-29 09:07:12 -04:00
parent f79c6ced20
commit 674c3c6079
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GPG Key ID: 25E1490B761470C2
1 changed files with 65 additions and 56 deletions
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121
src/js/scriptlets/element-picker.js
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@ -462,27 +462,21 @@ var filterTypes = {
// Extract the best possible cosmetic filter, i.e. as specific as possible.
// https://github.com/gorhill/uBlock/issues/1725
// Also take into account the `src` attribute for `img` elements -- and limit
// the value to the 1024 first characters.
// Also take into account the `src` attribute for `img` elements -- and limit
// the value to the 1024 first characters.
var cosmeticFilterFromElement = function(elem) {
if ( elem === null ) {
return 0;
}
if ( elem.nodeType !== 1 ) {
return 0;
}
if ( elem === null ) { return 0; }
if ( elem.nodeType !== 1 ) { return 0; }
if ( candidateElements.indexOf(elem) === -1 ) {
candidateElements.push(elem);
}
var tagName = elem.localName;
var selector = '';
var v, i;
let selector = '';
// Id
v = typeof elem.id === 'string' && CSS.escape(elem.id);
let v = typeof elem.id === 'string' && CSS.escape(elem.id);
if ( v ) {
selector = '#' + v;
}
@ -490,18 +484,20 @@ var cosmeticFilterFromElement = function(elem) {
// Class(es)
v = elem.classList;
if ( v ) {
i = v.length || 0;
let i = v.length || 0;
while ( i-- ) {
selector += '.' + CSS.escape(v.item(i));
}
}
// Tag name
let tagName = elem.localName;
// Use attributes if still no selector found.
// https://github.com/gorhill/uBlock/issues/1901
// Trim attribute value, this may help in case of malformed HTML.
// Trim attribute value, this may help in case of malformed HTML.
if ( selector === '' ) {
selector = tagName;
var attributes = [], attr;
let attributes = [], attr;
switch ( tagName ) {
case 'a':
v = elem.getAttribute('href');
@ -529,13 +525,11 @@ var cosmeticFilterFromElement = function(elem) {
break;
}
while ( (attr = attributes.pop()) ) {
if ( attr.v.length === 0 ) {
continue;
}
if ( attr.v.length === 0 ) { continue; }
v = elem.getAttribute(attr.k);
if ( attr.v === v ) {
selector += '[' + attr.k + '="' + attr.v + '"]';
} else if ( v.lastIndexOf(attr.v, 0) === 0 ) {
} else if ( v.startsWith(attr.v) ) {
selector += '[' + attr.k + '^="' + attr.v + '"]';
} else {
selector += '[' + attr.k + '*="' + attr.v + '"]';
@ -543,19 +537,31 @@ var cosmeticFilterFromElement = function(elem) {
}
}
// https://github.com/uBlockOrigin/uBlock-issues/issues/17
// If selector is ambiguous at this point, add the element name to
// further narrow it down.
let parentNode = elem.parentNode;
if (
selector === '' ||
safeQuerySelectorAll(parentNode, cssScope + selector).length > 1
) {
selector = tagName + selector;
}
// https://github.com/chrisaljoudi/uBlock/issues/637
// If the selector is still ambiguous at this point, further narrow using
// `nth-of-type`. It is preferable to use `nth-of-type` as opposed to
// `nth-child`, as `nth-of-type` is less volatile.
var parentNode = elem.parentNode;
// If the selector is still ambiguous at this point, further narrow using
// `nth-of-type`. It is preferable to use `nth-of-type` as opposed to
// `nth-child`, as `nth-of-type` is less volatile.
if ( safeQuerySelectorAll(parentNode, cssScope + selector).length > 1 ) {
i = 1;
let i = 1;
while ( elem.previousSibling !== null ) {
elem = elem.previousSibling;
if ( typeof elem.localName !== 'string' || elem.localName !== tagName ) {
continue;
if (
typeof elem.localName === 'string' &&
elem.localName === tagName
) {
i++;
}
i++;
}
selector += ':nth-of-type(' + i + ')';
}
@ -582,7 +588,7 @@ var filtersFrom = function(x, y) {
candidateElements.length = 0;
// We need at least one element.
var first = null;
let first = null;
if ( typeof x === 'number' ) {
first = elementFromPoint(x, y);
} else if ( x instanceof HTMLElement ) {
@ -596,23 +602,29 @@ var filtersFrom = function(x, y) {
}
// Cosmetic filter candidates from ancestors.
var elem = first;
let elem = first;
while ( elem && elem !== document.body ) {
cosmeticFilterFromElement(elem);
elem = elem.parentNode;
}
// The body tag is needed as anchor only when the immediate child
// uses`nth-of-type`.
var i = cosmeticFilterCandidates.length;
if ( i !== 0 && cosmeticFilterCandidates[i-1].indexOf(':nth-of-type(') !== -1 ) {
cosmeticFilterCandidates.push('##body');
// uses `nth-of-type`.
let i = cosmeticFilterCandidates.length;
if ( i !== 0 ) {
let selector = cosmeticFilterCandidates[i-1];
if (
selector.indexOf(':nth-of-type(') !== -1 &&
safeQuerySelectorAll(document.body, selector).length > 1
) {
cosmeticFilterCandidates.push('##body');
}
}
// https://github.com/gorhill/uBlock/issues/1545
// Network filter candidates from all other elements found at point (x, y).
if ( typeof x === 'number' ) {
var attrName = pickerRoot.id + '-clickblind';
var previous;
let attrName = pickerRoot.id + '-clickblind';
let previous;
elem = first;
while ( elem !== null ) {
previous = elem;
@ -623,7 +635,7 @@ var filtersFrom = function(x, y) {
}
netFilterFromElement(elem);
}
var elems = document.querySelectorAll('[' + attrName + ']');
let elems = document.querySelectorAll('[' + attrName + ']');
i = elems.length;
while ( i-- ) {
elems[i].removeAttribute(attrName);
@ -1014,35 +1026,34 @@ var onCandidateChanged = (function() {
/******************************************************************************/
var candidateFromFilterChoice = function(filterChoice) {
var slot = filterChoice.slot;
var filters = filterChoice.filters;
var filter = filters[slot];
let slot = filterChoice.slot;
let filters = filterChoice.filters;
let filter = filters[slot];
if ( filter === undefined ) {
return '';
}
if ( filter === undefined ) { return ''; }
// For net filters there no such thing as a path
if ( filter.lastIndexOf('##', 0) !== 0 ) {
return filter;
}
if ( filter.startsWith('##') === false ) { return filter; }
// At this point, we have a cosmetic filter
// Modifier means "target broadly". Hence:
// - Do not compute exact path.
// - Discard narrowing directives.
// - Remove the id if one or more classes exist
// TODO: should remove tag name too? ¯\_(ツ)_/¯
if ( filterChoice.modifier ) {
filter = filter.replace(/:nth-of-type\(\d+\)/, '');
// Remove the id if one or more classes exist.
if ( filter.charAt(2) === '#' && filter.indexOf('.') !== -1 ) {
filter = filter.replace(/#[^#.]+/, '');
if ( filter.indexOf('.') !== -1 ) {
if ( filter.charAt(2) === '#' ) {
filter = filter.replace(/#[^#.]+/, '');
}
}
return filter;
}
// Return path: the target element, then all siblings prepended
var selector = '', joiner = '';
let selector = '', joiner = '';
for ( ; slot < filters.length; slot++ ) {
filter = filters[slot];
// Remove all classes when an id exists.
@ -1051,19 +1062,17 @@ var candidateFromFilterChoice = function(filterChoice) {
}
selector = filter.slice(2) + joiner + selector;
// Stop at any element with an id: these are unique in a web page
if ( filter.lastIndexOf('###', 0) === 0 ) {
break;
}
if ( filter.startsWith('###') ) { break; }
// Stop if current selector matches only one element on the page
if ( document.querySelectorAll(selector).length === 1 ) {
break;
}
if ( document.querySelectorAll(selector).length === 1 ) { break; }
joiner = ' > ';
}
// https://github.com/gorhill/uBlock/issues/2519
// https://github.com/uBlockOrigin/uBlock-issues/issues/17
if (
slot === filters.length &&
selector.startsWith('body > ') === false &&
document.querySelectorAll(selector).length > 1
) {
selector = 'body > ' + selector;