Adding upstream version 1.55.0+dfsg.upstream/1.55.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1356 insertions, 0 deletions

diff --git a/src/js/scriptlets/epicker.js b/src/js/scriptlets/epicker.js
new file mode 100644
index 0000000..80489e8
--- /dev/null
+++ b/src/js/scriptlets/epicker.js
@@ -0,0 +1,1356 @@
+/*******************************************************************************
+
+    uBlock Origin - a comprehensive, efficient content blocker
+    Copyright (C) 2014-present Raymond Hill
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+/* global CSS */
+
+'use strict';
+
+/******************************************************************************/
+/******************************************************************************/
+
+(async ( ) => {
+
+/******************************************************************************/
+
+if ( typeof vAPI !== 'object' ) { return; }
+if ( typeof vAPI === null ) { return; }
+
+if ( vAPI.pickerFrame ) { return; }
+vAPI.pickerFrame = true;
+
+const pickerUniqueId = vAPI.randomToken();
+
+const reCosmeticAnchor = /^#(\$|\?|\$\?)?#/;
+
+const netFilterCandidates = [];
+const cosmeticFilterCandidates = [];
+
+let targetElements = [];
+let candidateElements = [];
+let bestCandidateFilter = null;
+
+const lastNetFilterSession = window.location.host + window.location.pathname;
+let lastNetFilterHostname = '';
+let lastNetFilterUnion = '';
+
+const hideBackgroundStyle = 'background-image:none!important;';
+
+/******************************************************************************/
+
+const safeQuerySelectorAll = function(node, selector) {
+    if ( node !== null ) {
+        try {
+            return node.querySelectorAll(selector);
+        } catch (e) {
+        }
+    }
+    return [];
+};
+
+/******************************************************************************/
+
+const getElementBoundingClientRect = function(elem) {
+    let rect = typeof elem.getBoundingClientRect === 'function'
+        ? elem.getBoundingClientRect()
+        : { height: 0, left: 0, top: 0, width: 0 };
+
+    // https://github.com/gorhill/uBlock/issues/1024
+    // Try not returning an empty bounding rect.
+    if ( rect.width !== 0 && rect.height !== 0 ) {
+        return rect;
+    }
+    if ( elem.shadowRoot instanceof DocumentFragment ) {
+        return getElementBoundingClientRect(elem.shadowRoot);
+    }
+
+    let left = rect.left,
+        right = left + rect.width,
+        top = rect.top,
+        bottom = top + rect.height;
+
+    for ( const child of elem.children ) {
+        rect = getElementBoundingClientRect(child);
+        if ( rect.width === 0 || rect.height === 0 ) { continue; }
+        if ( rect.left < left ) { left = rect.left; }
+        if ( rect.right > right ) { right = rect.right; }
+        if ( rect.top < top ) { top = rect.top; }
+        if ( rect.bottom > bottom ) { bottom = rect.bottom; }
+    }
+
+    return {
+        bottom,
+        height: bottom - top,
+        left,
+        right,
+        top,
+        width: right - left
+    };
+};
+
+/******************************************************************************/
+
+const highlightElements = function(elems, force) {
+    // To make mouse move handler more efficient
+    if (
+        (force !== true) &&
+        (elems.length === targetElements.length) &&
+        (elems.length === 0 || elems[0] === targetElements[0])
+    ) {
+        return;
+    }
+    targetElements = [];
+
+    const ow = self.innerWidth;
+    const oh = self.innerHeight;
+    const islands = [];
+
+    for ( const elem of elems ) {
+        if ( elem === pickerFrame ) { continue; }
+        targetElements.push(elem);
+        const rect = getElementBoundingClientRect(elem);
+        // Ignore offscreen areas
+        if (
+            rect.left > ow || rect.top > oh ||
+            rect.left + rect.width < 0 || rect.top + rect.height < 0
+        ) {
+            continue;
+        }
+        islands.push(
+            `M${rect.left} ${rect.top}h${rect.width}v${rect.height}h-${rect.width}z`
+        );
+    }
+
+    pickerFramePort.postMessage({
+        what: 'svgPaths',
+        ocean: `M0 0h${ow}v${oh}h-${ow}z`,
+        islands: islands.join(''),
+    });
+};
+
+/******************************************************************************/
+
+const mergeStrings = function(urls) {
+    if ( urls.length === 0 ) { return ''; }
+    if (
+        urls.length === 1 ||
+        self.diff_match_patch instanceof Function === false
+    ) {
+        return urls[0];
+    }
+    const differ = new self.diff_match_patch();
+    let merged = urls[0];
+    for ( let i = 1; i < urls.length; i++ ) {
+        // The differ works at line granularity: we insert a linefeed after
+        // each character to trick the differ to work at character granularity.
+        const diffs = differ.diff_main(
+            urls[i].split('').join('\n'),
+            merged.split('').join('\n')
+        );
+        const result = [];
+        for ( const diff of diffs ) {
+            if ( diff[0] !== 0 ) {
+                result.push('*');
+            } else {
+                result.push(diff[1].replace(/\n+/g, ''));
+            }
+            merged = result.join('');
+        }
+    }
+    // Keep usage of wildcards to a sane level, too many of them can cause
+    // high overhead filters
+    merged = merged.replace(/^\*+$/, '')
+                   .replace(/\*{2,}/g, '*')
+                   .replace(/([^*]{1,3}\*)(?:[^*]{1,3}\*)+/g, '$1');
+
+    // https://github.com/uBlockOrigin/uBlock-issues/issues/1494
+    let pos = merged.indexOf('/');
+    if ( pos === -1 ) { pos = merged.length; }
+    return merged.slice(0, pos).includes('*') ? urls[0] : merged;
+};
+
+/******************************************************************************/
+
+// Remove fragment part from a URL.
+
+const trimFragmentFromURL = function(url) {
+    const pos = url.indexOf('#');
+    return pos !== -1 ? url.slice(0, pos) : url;
+};
+
+/******************************************************************************/
+
+// https://github.com/gorhill/uBlock/issues/1897
+// Ignore `data:` URI, they can't be handled by an HTTP observer.
+
+const backgroundImageURLFromElement = function(elem) {
+    const style = window.getComputedStyle(elem);
+    const bgImg = style.backgroundImage || '';
+    const matches = /^url\((["']?)([^"']+)\1\)$/.exec(bgImg);
+    const url = matches !== null && matches.length === 3 ? matches[2] : '';
+    return url.lastIndexOf('data:', 0) === -1
+        ? trimFragmentFromURL(url.slice(0, 1024))
+        : '';
+};
+
+/******************************************************************************/
+
+// https://github.com/gorhill/uBlock/issues/1725#issuecomment-226479197
+//   Limit returned string to 1024 characters.
+//   Also, return only URLs which will be seen by an HTTP observer.
+// https://github.com/uBlockOrigin/uBlock-issues/issues/2260
+//   Maybe get to the actual URL indirectly.
+const resourceURLsFromElement = function(elem) {
+    const urls = [];
+    const tagName = elem.localName;
+    const prop = netFilter1stSources[tagName];
+    if ( prop === undefined ) {
+        const url = backgroundImageURLFromElement(elem);
+        if ( url !== '' ) { urls.push(url); }
+        return urls;
+    }
+    let s = elem[prop];
+    if ( s instanceof SVGAnimatedString ) {
+        s = s.baseVal;
+    }
+    if ( typeof s === 'string' && /^https?:\/\//.test(s) ) {
+        urls.push(trimFragmentFromURL(s.slice(0, 1024)));
+    }
+    resourceURLsFromSrcset(elem, urls);
+    resourceURLsFromPicture(elem, urls);
+    return urls;
+};
+
+// https://html.spec.whatwg.org/multipage/images.html#parsing-a-srcset-attribute
+// https://github.com/uBlockOrigin/uBlock-issues/issues/1071
+const resourceURLsFromSrcset = function(elem, out) {
+    let srcset = elem.srcset;
+    if ( typeof srcset !== 'string' || srcset === '' ) { return; }
+    for(;;) {
+        // trim whitespace
+        srcset = srcset.trim();
+        if ( srcset.length === 0 ) { break; }
+        // abort in case of leading comma
+        if ( /^,/.test(srcset) ) { break; }
+        // collect and consume all non-whitespace characters
+        let match = /^\S+/.exec(srcset);
+        if ( match === null ) { break; }
+        srcset = srcset.slice(match.index + match[0].length);
+        let url = match[0];
+        // consume descriptor, if any
+        if ( /,$/.test(url) ) {
+            url = url.replace(/,$/, '');
+            if ( /,$/.test(url) ) { break; }
+        } else {
+            match = /^[^,]*(?:\(.+?\))?[^,]*(?:,|$)/.exec(srcset);
+            if ( match === null ) { break; }
+            srcset = srcset.slice(match.index + match[0].length);
+        }
+        const parsedURL = new URL(url, document.baseURI);
+        if ( parsedURL.pathname.length === 0 ) { continue; }
+        out.push(trimFragmentFromURL(parsedURL.href));
+    }
+};
+
+// https://github.com/uBlockOrigin/uBlock-issues/issues/2069#issuecomment-1080600661
+// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/picture
+const resourceURLsFromPicture = function(elem, out) {
+    if ( elem.localName === 'source' ) { return; }
+    const picture = elem.parentElement;
+    if ( picture === null || picture.localName !== 'picture' ) { return; }
+    const sources = picture.querySelectorAll(':scope > source');
+    for ( const source of sources ) {
+        const urls = resourceURLsFromElement(source);
+        if ( urls.length === 0 ) { continue; }
+        out.push(...urls);
+    }
+};
+
+/******************************************************************************/
+
+const netFilterFromUnion = function(patternIn, out) {
+    // Reset reference filter when dealing with unrelated URLs
+    const currentHostname = self.location.hostname;
+    if (
+        lastNetFilterUnion === '' ||
+        currentHostname === '' ||
+        currentHostname !== lastNetFilterHostname
+    ) {
+        lastNetFilterHostname = currentHostname;
+        lastNetFilterUnion = patternIn;
+        vAPI.messaging.send('elementPicker', {
+            what: 'elementPickerEprom',
+            lastNetFilterSession,
+            lastNetFilterHostname,
+            lastNetFilterUnion,
+        });
+        return;
+    }
+
+    // Related URLs
+    lastNetFilterHostname = currentHostname;
+    let patternOut = mergeStrings([ patternIn, lastNetFilterUnion ]);
+    if ( patternOut !== '/*' && patternOut !== patternIn ) {
+        const filter = `||${patternOut}`;
+        if ( out.indexOf(filter) === -1 ) {
+            out.push(filter);
+        }
+        lastNetFilterUnion = patternOut;
+    }
+
+    // Remember across element picker sessions
+    vAPI.messaging.send('elementPicker', {
+        what: 'elementPickerEprom',
+        lastNetFilterSession,
+        lastNetFilterHostname,
+        lastNetFilterUnion,
+    });
+};
+
+/******************************************************************************/
+
+// Extract the best possible net filter, i.e. as specific as possible.
+
+const netFilterFromElement = function(elem) {
+    if ( elem === null ) { return 0; }
+    if ( elem.nodeType !== 1 ) { return 0; }
+    const urls = resourceURLsFromElement(elem);
+    if ( urls.length === 0 ) { return 0; }
+
+    if ( candidateElements.indexOf(elem) === -1 ) {
+        candidateElements.push(elem);
+    }
+
+    const candidates = netFilterCandidates;
+    const len = candidates.length;
+
+    for ( let i = 0; i < urls.length; i++ ) {
+        urls[i] = urls[i].replace(/^https?:\/\//, '');
+    }
+    const pattern = mergeStrings(urls);
+
+
+    if ( bestCandidateFilter === null && elem.matches('html,body') === false ) {
+        bestCandidateFilter = {
+            type: 'net',
+            filters: candidates,
+            slot: candidates.length
+        };
+    }
+
+    candidates.push(`||${pattern}`);
+
+    // Suggest a less narrow filter if possible
+    const pos = pattern.indexOf('?');
+    if ( pos !== -1 ) {
+        candidates.push(`||${pattern.slice(0, pos)}`);
+    }
+
+    // Suggest a filter which is a result of combining more than one URL.
+    netFilterFromUnion(pattern, candidates);
+
+    return candidates.length - len;
+};
+
+const netFilter1stSources = {
+     'audio': 'src',
+     'embed': 'src',
+    'iframe': 'src',
+       'img': 'src',
+     'image': 'href',
+    'object': 'data',
+    'source': 'src',
+     'video': 'src'
+};
+
+const filterTypes = {
+     'audio': 'media',
+     'embed': 'object',
+    'iframe': 'subdocument',
+       'img': 'image',
+    'object': 'object',
+     'video': 'media',
+};
+
+/******************************************************************************/
+
+// 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.
+
+const cosmeticFilterFromElement = function(elem) {
+    if ( elem === null ) { return 0; }
+    if ( elem.nodeType !== 1 ) { return 0; }
+    if ( noCosmeticFiltering ) { return 0; }
+
+    if ( candidateElements.indexOf(elem) === -1 ) {
+        candidateElements.push(elem);
+    }
+
+    let selector = '';
+
+    // Id
+    let v = typeof elem.id === 'string' && CSS.escape(elem.id);
+    if ( v ) {
+        selector = '#' + v;
+    }
+
+    // Class(es)
+    v = elem.classList;
+    if ( v ) {
+        let i = v.length || 0;
+        while ( i-- ) {
+            selector += '.' + CSS.escape(v.item(i));
+        }
+    }
+
+    // Tag name
+    const tagName = CSS.escape(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.
+    //
+    // https://github.com/uBlockOrigin/uBlock-issues/issues/1923
+    //   Escape unescaped `"` in attribute values
+    if ( selector === '' ) {
+        let attributes = [], attr;
+        switch ( tagName ) {
+        case 'a':
+            v = elem.getAttribute('href');
+            if ( v ) {
+                v = v.trim().replace(/\?.*$/, '');
+                if ( v.length ) {
+                    attributes.push({ k: 'href', v: v });
+                }
+            }
+            break;
+        case 'iframe':
+        case 'img':
+            v = elem.getAttribute('src');
+            if ( v && v.length !== 0 ) {
+                v = v.trim();
+                if ( v.startsWith('data:') ) {
+                    let pos = v.indexOf(',');
+                    if ( pos !== -1 ) {
+                        v = v.slice(0, pos + 1);
+                    }
+                } else if ( v.startsWith('blob:') ) {
+                    v = new URL(v.slice(5));
+                    v.pathname = '';
+                    v = 'blob:' + v.href;
+                }
+                attributes.push({ k: 'src', v: v.slice(0, 256) });
+                break;
+            }
+            v = elem.getAttribute('alt');
+            if ( v && v.length !== 0 ) {
+                attributes.push({ k: 'alt', v: v });
+                break;
+            }
+            break;
+        default:
+            break;
+        }
+        while ( (attr = attributes.pop()) ) {
+            if ( attr.v.length === 0 ) { continue; }
+            const w = attr.v.replace(/([^\\])"/g, '$1\\"');
+            v = elem.getAttribute(attr.k);
+            if ( attr.v === v ) {
+                selector += `[${attr.k}="${w}"]`;
+            } else if ( v.startsWith(attr.v) ) {
+                selector += `[${attr.k}^="${w}"]`;
+            } else {
+                selector += `[${attr.k}*="${w}"]`;
+            }
+        }
+    }
+
+    // https://github.com/uBlockOrigin/uBlock-issues/issues/17
+    //   If selector is ambiguous at this point, add the element name to
+    //   further narrow it down.
+    const parentNode = elem.parentNode;
+    if (
+        selector === '' ||
+        safeQuerySelectorAll(parentNode, `:scope > ${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.
+    if ( safeQuerySelectorAll(parentNode, `:scope > ${selector}`).length > 1 ) {
+        let i = 1;
+        while ( elem.previousSibling !== null ) {
+            elem = elem.previousSibling;
+            if (
+                typeof elem.localName === 'string' &&
+                elem.localName === tagName
+            ) {
+                i++;
+            }
+        }
+        selector += `:nth-of-type(${i})`;
+    }
+
+    if ( bestCandidateFilter === null ) {
+        bestCandidateFilter = {
+            type: 'cosmetic',
+            filters: cosmeticFilterCandidates,
+            slot: cosmeticFilterCandidates.length
+        };
+    }
+
+    cosmeticFilterCandidates.push(`##${selector}`);
+
+    return 1;
+};
+
+/******************************************************************************/
+
+const filtersFrom = function(x, y) {
+    bestCandidateFilter = null;
+    netFilterCandidates.length = 0;
+    cosmeticFilterCandidates.length = 0;
+    candidateElements.length = 0;
+
+    // We need at least one element.
+    let first = null;
+    if ( typeof x === 'number' ) {
+        first = elementFromPoint(x, y);
+    } else if ( x instanceof HTMLElement ) {
+        first = x;
+        x = undefined;
+    }
+
+    // https://github.com/gorhill/uBlock/issues/1545
+    //   Network filter candidates from all other elements found at [x,y].
+    // https://www.reddit.com/r/uBlockOrigin/comments/qmjk36/
+    //   Extract network candidates first.
+    if ( typeof x === 'number' ) {
+        const magicAttr = `${pickerUniqueId}-clickblind`;
+        pickerFrame.setAttribute(magicAttr, '');
+        const elems = document.elementsFromPoint(x, y);
+        pickerFrame.removeAttribute(magicAttr);
+        for ( const elem of elems ) {
+            netFilterFromElement(elem);
+        }
+    } else if ( first !== null ) {
+        netFilterFromElement(first);
+    }
+
+    // Cosmetic filter candidates from ancestors.
+    // https://github.com/gorhill/uBlock/issues/2519
+    // https://github.com/uBlockOrigin/uBlock-issues/issues/17
+    //   Prepend `body` if full selector is ambiguous.
+    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`.
+    let i = cosmeticFilterCandidates.length;
+    if ( i !== 0 ) {
+        const selector = cosmeticFilterCandidates[i-1].slice(2);
+        if ( safeQuerySelectorAll(document.body, selector).length > 1 ) {
+            cosmeticFilterCandidates.push('##body');
+        }
+    }
+
+    // https://github.com/gorhill/uBlock/commit/ebaa8a8bb28aef043a68c99965fe6c128a3fe5e4#commitcomment-63818019
+    //   If still no best candidate, just use whatever is available in network
+    //   filter candidates -- which may have been previously skipped in favor
+    //   of cosmetic filters.
+    if ( bestCandidateFilter === null && netFilterCandidates.length !== 0 ) {
+        bestCandidateFilter = {
+            type: 'net',
+            filters: netFilterCandidates,
+            slot: 0
+        };
+    }
+
+    return netFilterCandidates.length + cosmeticFilterCandidates.length;
+};
+
+/*******************************************************************************
+
+    filterToDOMInterface.queryAll
+    @desc   Look-up all the HTML elements matching the filter passed in
+            argument.
+    @param  string, a cosmetic or network filter.
+    @param  function, called once all items matching the filter have been
+            collected.
+    @return array, or undefined if the filter is invalid.
+
+    filterToDOMInterface.preview
+    @desc   Apply/unapply filter to the DOM.
+    @param  string, a cosmetic of network filter, or literal false to remove
+            the effects of the filter on the DOM.
+    @return undefined.
+
+    TODO: need to be revised once I implement chained cosmetic operators.
+
+*/
+
+const filterToDOMInterface = (( ) => {
+    const reHnAnchorPrefix = '^[\\w-]+://(?:[^/?#]+\\.)?';
+    const reCaret = '(?:[^%.0-9a-z_-]|$)';
+    const rePseudoElements = /:(?::?after|:?before|:[a-z-]+)$/;
+
+    // Net filters: we need to lookup manually -- translating into a foolproof
+    // CSS selector is just not possible.
+    //
+    // https://github.com/chrisaljoudi/uBlock/issues/945
+    //   Transform into a regular expression, this allows the user to
+    //   edit and insert wildcard(s) into the proposed filter.
+    // https://www.reddit.com/r/uBlockOrigin/comments/c5do7w/
+    //   Better handling of pure hostname filters. Also, discard single
+    //   alphanumeric character filters.
+    const fromNetworkFilter = function(filter) {
+        const out = [];
+        if ( /^[0-9a-z]$/i.test(filter) ) { return out; }
+        let reStr = '';
+        if (
+            filter.length > 2 &&
+            filter.startsWith('/') &&
+            filter.endsWith('/')
+        ) {
+            reStr = filter.slice(1, -1);
+        } else if ( /^\w[\w.-]*[a-z]$/i.test(filter) ) {
+            reStr = reHnAnchorPrefix +
+                    filter.toLowerCase().replace(/\./g, '\\.') +
+                    reCaret;
+        } else {
+            let rePrefix = '', reSuffix = '';
+            if ( filter.startsWith('||') ) {
+                rePrefix = reHnAnchorPrefix;
+                filter = filter.slice(2);
+            } else if ( filter.startsWith('|') ) {
+                rePrefix = '^';
+                filter = filter.slice(1);   
+            }
+            if ( filter.endsWith('|') ) {
+                reSuffix = '$';
+                filter = filter.slice(0, -1);
+            }
+            reStr = rePrefix +
+                    filter.replace(/[.+?${}()|[\]\\]/g, '\\$&')
+                          .replace(/\*+/g, '.*')
+                          .replace(/\^/g, reCaret) +
+                    reSuffix;
+        }
+        let reFilter = null;
+        try {
+            reFilter = new RegExp(reStr, 'i');
+        }
+        catch (e) {
+            return out;
+        }
+
+        // Lookup by tag names.
+        // https://github.com/uBlockOrigin/uBlock-issues/issues/2260
+        //   Maybe get to the actual URL indirectly.
+        const elems = document.querySelectorAll(
+            Object.keys(netFilter1stSources).join()
+        );
+        for ( const elem of elems ) {
+            const srcProp = netFilter1stSources[elem.localName];
+            let src = elem[srcProp];
+            if ( src instanceof SVGAnimatedString ) {
+                src = src.baseVal;
+            }
+            if (
+                typeof src === 'string' &&
+                    reFilter.test(src) ||
+                typeof elem.currentSrc === 'string' &&
+                    reFilter.test(elem.currentSrc)
+            ) {
+                out.push({
+                    elem,
+                    src: srcProp,
+                    opt: filterTypes[elem.localName],
+                    style: vAPI.hideStyle,
+                });
+            }
+        }
+
+        // Find matching background image in current set of candidate elements.
+        for ( const elem of candidateElements ) {
+            if ( reFilter.test(backgroundImageURLFromElement(elem)) ) {
+                out.push({
+                    elem,
+                    bg: true,
+                    opt: 'image',
+                    style: hideBackgroundStyle,
+                });
+            }
+        }
+
+        return out;
+    };
+
+    // Cosmetic filters: these are straight CSS selectors.
+    //
+    // https://github.com/uBlockOrigin/uBlock-issues/issues/389
+    //   Test filter using comma-separated list to better detect invalid CSS
+    //   selectors.
+    //
+    // https://github.com/gorhill/uBlock/issues/2515
+    //   Remove trailing pseudo-element when querying.
+    const fromPlainCosmeticFilter = function(raw) {
+        let elems;
+        try {
+            document.documentElement.matches(`${raw},\na`);
+            elems = document.querySelectorAll(
+                raw.replace(rePseudoElements, '')
+            );
+        }
+        catch (e) {
+            return;
+        }
+        const out = [];
+        for ( const elem of elems ) {
+            if ( elem === pickerFrame ) { continue; }
+            out.push({ elem, raw, style: vAPI.hideStyle });
+        }
+        return out;
+    };
+
+    // https://github.com/gorhill/uBlock/issues/1772
+    //   Handle procedural cosmetic filters.
+    //
+    // https://github.com/gorhill/uBlock/issues/2515
+    //   Remove trailing pseudo-element when querying.
+    const fromCompiledCosmeticFilter = function(raw) {
+        if ( noCosmeticFiltering ) { return; }
+        if ( typeof raw !== 'string' ) { return; }
+        let elems, style;
+        try {
+            const o = JSON.parse(raw);
+            elems = vAPI.domFilterer.createProceduralFilter(o).exec();
+            switch ( o.action && o.action[0] || '' ) {
+            case '':
+            case 'remove':
+                style = vAPI.hideStyle;
+                break;
+            case 'style':
+                style = o.action[1];
+                break;
+            default:
+                break;
+            }
+        } catch(ex) {
+            return;
+        }
+        if ( !elems ) { return; }
+        const out = [];
+        for ( const elem of elems ) {
+            out.push({ elem, raw, style });
+        }
+        return out;
+    };
+
+    vAPI.epickerStyleProxies = vAPI.epickerStyleProxies || new Map();
+
+    let lastFilter;
+    let lastResultset;
+    let previewing = false;
+
+    const queryAll = function(details) {
+        let { filter, compiled } = details;
+        filter = filter.trim();
+        if ( filter === lastFilter ) { return lastResultset; }
+        unapply();
+        if ( filter === '' || filter === '!' ) {
+            lastFilter = '';
+            lastResultset = undefined;
+            return;
+        }
+        lastFilter = filter;
+        if ( reCosmeticAnchor.test(filter) === false ) {
+            lastResultset = fromNetworkFilter(filter);
+            if ( previewing ) { apply(); }
+            return lastResultset;
+        }
+        lastResultset = fromPlainCosmeticFilter(compiled);
+        if ( lastResultset ) {
+            if ( previewing ) { apply(); }
+            return lastResultset;
+        }
+        // Procedural cosmetic filter
+        lastResultset = fromCompiledCosmeticFilter(compiled);
+        if ( previewing ) { apply(); }
+        return lastResultset;
+    };
+
+    const apply = function() {
+        unapply();
+        if ( Array.isArray(lastResultset) === false ) { return; }
+        const rootElem = document.documentElement;
+        for ( const { elem, style } of lastResultset ) {
+            if ( elem === pickerFrame ) { continue; }
+            if ( style === undefined ) { continue; }
+            if ( elem === rootElem && style === vAPI.hideStyle ) { continue; }
+            let styleToken = vAPI.epickerStyleProxies.get(style);
+            if ( styleToken === undefined ) {
+                styleToken = vAPI.randomToken();
+                vAPI.epickerStyleProxies.set(style, styleToken);
+                vAPI.userStylesheet.add(`[${styleToken}]\n{${style}}`, true);
+            }
+            elem.setAttribute(styleToken, '');
+        }
+    };
+
+    const unapply = function() {
+        for ( const styleToken of vAPI.epickerStyleProxies.values() ) {
+            for ( const elem of document.querySelectorAll(`[${styleToken}]`) ) {
+                elem.removeAttribute(styleToken);
+            }
+        }
+    };
+
+    // https://www.reddit.com/r/uBlockOrigin/comments/c62irc/
+    //   Support injecting the cosmetic filters into the DOM filterer
+    //   immediately rather than wait for the next page load.
+    const preview = function(state, permanent = false) {
+        previewing = state !== false;
+        if ( previewing === false ) {
+            return unapply();
+        }
+        if ( Array.isArray(lastResultset) === false ) { return; }
+        if ( permanent === false || reCosmeticAnchor.test(lastFilter) === false ) {
+            return apply();
+        }
+        if ( noCosmeticFiltering ) { return; }
+        const cssSelectors = new Set();
+        const proceduralSelectors = new Set();
+        for ( const { raw } of lastResultset ) {
+            if ( raw.startsWith('{') ) {
+                proceduralSelectors.add(raw);
+            } else {
+                cssSelectors.add(raw);
+            }
+        }
+        if ( cssSelectors.size !== 0 ) {
+            vAPI.domFilterer.addCSS(
+                `${Array.from(cssSelectors).join('\n')}\n{${vAPI.hideStyle}}`,
+                { mustInject: true }
+            );
+        }
+        if ( proceduralSelectors.size !== 0 ) {
+            vAPI.domFilterer.addProceduralSelectors(
+                Array.from(proceduralSelectors)
+            );
+        }
+    };
+
+    return { preview, queryAll };
+})();
+
+/******************************************************************************/
+
+const onOptimizeCandidates = function(details) {
+    const { candidates } = details;
+    const results = [];
+    for ( const paths of candidates ) {
+        let count = Number.MAX_SAFE_INTEGER;
+        let selector = '';
+        for ( let i = 0, n = paths.length; i < n; i++ ) {
+            const s = paths.slice(n - i - 1).join('');
+            const elems = document.querySelectorAll(s);
+            if ( elems.length < count ) {
+                selector = s;
+                count = elems.length;
+            }
+        }
+        results.push({ selector: `##${selector}`, count });
+    }
+    // Sort by most match count and shortest selector to least match count and
+    // longest selector.
+    results.sort((a, b) => {
+        const r = b.count - a.count;
+        if ( r !== 0 ) { return r; }
+        return a.selector.length - b.selector.length;
+    });
+    pickerFramePort.postMessage({
+        what: 'candidatesOptimized',
+        candidates: results.map(a => a.selector),
+        slot: details.slot,
+    });
+};
+
+/******************************************************************************/
+
+const showDialog = function(options) {
+    pickerFramePort.postMessage({
+        what: 'showDialog',
+        url: self.location.href,
+        netFilters: netFilterCandidates,
+        cosmeticFilters: cosmeticFilterCandidates,
+        filter: bestCandidateFilter,
+        options,
+    });
+};
+
+/******************************************************************************/
+
+const elementFromPoint = (( ) => {
+    let lastX, lastY;
+
+    return (x, y) => {
+        if ( x !== undefined ) {
+            lastX = x; lastY = y;
+        } else if ( lastX !== undefined ) {
+            x = lastX; y = lastY;
+        } else {
+            return null;
+        }
+        if ( !pickerFrame ) { return null; }
+        const magicAttr = `${pickerUniqueId}-clickblind`;
+        pickerFrame.setAttribute(magicAttr, '');
+        let elem = document.elementFromPoint(x, y);
+        if (
+            elem === null || /* to skip following tests */
+            elem === document.body ||
+            elem === document.documentElement || (
+                pickerBootArgs.zap !== true &&
+                noCosmeticFiltering &&
+                resourceURLsFromElement(elem).length === 0
+            )
+        ) {
+            elem = null;
+        }
+        // https://github.com/uBlockOrigin/uBlock-issues/issues/380
+        pickerFrame.removeAttribute(magicAttr);
+        return elem;
+    };
+})();
+
+/******************************************************************************/
+
+const highlightElementAtPoint = function(mx, my) {
+    const elem = elementFromPoint(mx, my);
+    highlightElements(elem ? [ elem ] : []);
+};
+
+/******************************************************************************/
+
+const filterElementAtPoint = function(mx, my, broad) {
+    if ( filtersFrom(mx, my) === 0 ) { return; }
+    showDialog({ broad });
+};
+
+/******************************************************************************/
+
+// https://www.reddit.com/r/uBlockOrigin/comments/bktxtb/scrolling_doesnt_work/emn901o
+//   Override 'fixed' position property on body element if present.
+
+// With touch-driven devices, first highlight the element and remove only
+// when tapping again the highlighted area.
+
+const zapElementAtPoint = function(mx, my, options) {
+    if ( options.highlight ) {
+        const elem = elementFromPoint(mx, my);
+        if ( elem ) {
+            highlightElements([ elem ]);
+        }
+        return;
+    }
+
+    let elemToRemove = targetElements.length !== 0 && targetElements[0] || null;
+    if ( elemToRemove === null && mx !== undefined ) {
+        elemToRemove = elementFromPoint(mx, my);
+    }
+
+    if ( elemToRemove instanceof Element === false ) { return; }
+
+    const getStyleValue = (elem, prop) => {
+        const style = window.getComputedStyle(elem);
+        return style ? style[prop] : '';
+    };
+
+    // Heuristic to detect scroll-locking: remove such lock when detected.
+    let maybeScrollLocked = elemToRemove.shadowRoot instanceof DocumentFragment;
+    if ( maybeScrollLocked === false ) {
+        let elem = elemToRemove;
+        do {
+            maybeScrollLocked =
+                parseInt(getStyleValue(elem, 'zIndex'), 10) >= 1000 ||
+                getStyleValue(elem, 'position') === 'fixed';
+            elem = elem.parentElement;
+        } while ( elem !== null && maybeScrollLocked === false );
+    }
+    if ( maybeScrollLocked ) {
+        const doc = document;
+        if ( getStyleValue(doc.body, 'overflowY') === 'hidden' ) {
+            doc.body.style.setProperty('overflow', 'auto', 'important');
+        }
+        if ( getStyleValue(doc.body, 'position') === 'fixed' ) {
+            doc.body.style.setProperty('position', 'initial', 'important');
+        }
+        if ( getStyleValue(doc.documentElement, 'position') === 'fixed' ) {
+            doc.documentElement.style.setProperty('position', 'initial', 'important');
+        }
+        if ( getStyleValue(doc.documentElement, 'overflowY') === 'hidden' ) {
+            doc.documentElement.style.setProperty('overflow', 'auto', 'important');
+        }
+    }
+    elemToRemove.remove();
+    highlightElementAtPoint(mx, my);
+};
+
+/******************************************************************************/
+
+const onKeyPressed = function(ev) {
+    // Delete
+    if (
+        (ev.key === 'Delete' || ev.key === 'Backspace') &&
+        pickerBootArgs.zap
+    ) {
+        ev.stopPropagation();
+        ev.preventDefault();
+        zapElementAtPoint();
+        return;
+    }
+    // Esc
+    if ( ev.key === 'Escape' || ev.which === 27 ) {
+        ev.stopPropagation();
+        ev.preventDefault();
+        filterToDOMInterface.preview(false);
+        quitPicker();
+        return;
+    }
+};
+
+/******************************************************************************/
+
+// https://github.com/chrisaljoudi/uBlock/issues/190
+//   May need to dynamically adjust the height of the overlay + new position
+//   of highlighted elements.
+
+const onViewportChanged = function() {
+    highlightElements(targetElements, true);
+};
+
+/******************************************************************************/
+
+// Auto-select a specific target, if any, and if possible
+
+const startPicker = function() {
+    pickerFrame.focus();
+
+    self.addEventListener('scroll', onViewportChanged, { passive: true });
+    self.addEventListener('resize', onViewportChanged, { passive: true });
+    self.addEventListener('keydown', onKeyPressed, true);
+
+    // Try using mouse position
+    if (
+        pickerBootArgs.mouse &&
+        vAPI.mouseClick instanceof Object &&
+        typeof vAPI.mouseClick.x === 'number' &&
+        vAPI.mouseClick.x > 0
+    ) {
+        if ( filtersFrom(vAPI.mouseClick.x, vAPI.mouseClick.y) !== 0 ) {
+            return showDialog();
+        }
+    }
+
+    // No mouse position available, use suggested target
+    const target = pickerBootArgs.target || '';
+    const pos = target.indexOf('\t');
+    if ( pos === -1 ) { return; }
+
+    const srcAttrMap = {
+        'a': 'href',
+        'audio': 'src',
+        'embed': 'src',
+        'iframe': 'src',
+        'img': 'src',
+        'video': 'src',
+    };
+    const tagName = target.slice(0, pos);
+    const url = target.slice(pos + 1);
+    const attr = srcAttrMap[tagName];
+    if ( attr === undefined ) { return; }
+    const elems = document.getElementsByTagName(tagName);
+    for ( const elem of elems  ) {
+        if ( elem === pickerFrame ) { continue; }
+        const srcs = resourceURLsFromElement(elem);
+        if (
+            (srcs.length !== 0 && srcs.includes(url) === false) ||
+            (srcs.length === 0 && url !== 'about:blank')
+        ) {
+            continue;
+        }
+        filtersFrom(elem);
+        if (
+            netFilterCandidates.length !== 0 ||
+            cosmeticFilterCandidates.length !== 0
+        ) {
+            if ( pickerBootArgs.mouse !== true ) {
+                elem.scrollIntoView({
+                    behavior: 'smooth',
+                    block: 'center',
+                    inline: 'center'
+                });
+            }
+            showDialog({ broad: true });
+        }
+        return;
+    }
+
+    // A target was specified, but it wasn't found: abort.
+    quitPicker();
+};
+
+/******************************************************************************/
+
+// Let's have the element picker code flushed from memory when no longer
+// in use: to ensure this, release all local references.
+
+const quitPicker = function() {
+    self.removeEventListener('scroll', onViewportChanged, { passive: true });
+    self.removeEventListener('resize', onViewportChanged, { passive: true });
+    self.removeEventListener('keydown', onKeyPressed, true);
+    vAPI.shutdown.remove(quitPicker);
+    if ( pickerFramePort ) {
+        pickerFramePort.close();
+        pickerFramePort = null;
+    }
+    if ( pickerFrame ) {
+        pickerFrame.remove();
+        pickerFrame = null;
+    }
+    vAPI.userStylesheet.remove(pickerCSS);
+    vAPI.userStylesheet.apply();
+    vAPI.pickerFrame = false;
+    self.focus();
+};
+
+vAPI.shutdown.add(quitPicker);
+
+/******************************************************************************/
+
+const onDialogMessage = function(msg) {
+    switch ( msg.what ) {
+        case 'start':
+            startPicker();
+            if ( pickerFramePort === null ) { break; }
+            if ( targetElements.length === 0 ) {
+                highlightElements([], true);
+            }
+            break;
+        case 'optimizeCandidates':
+            onOptimizeCandidates(msg);
+            break;
+        case 'dialogCreate':
+            filterToDOMInterface.queryAll(msg);
+            filterToDOMInterface.preview(true, true);
+            quitPicker();
+            break;
+        case 'dialogSetFilter': {
+            const resultset = filterToDOMInterface.queryAll(msg) || [];
+            highlightElements(resultset.map(a => a.elem), true);
+            if ( msg.filter === '!' ) { break; }
+            pickerFramePort.postMessage({
+                what: 'resultsetDetails',
+                count: resultset.length,
+                opt: resultset.length !== 0 ? resultset[0].opt : undefined,
+            });
+            break;
+        }
+        case 'quitPicker':
+            filterToDOMInterface.preview(false);
+            quitPicker();
+            break;
+        case 'highlightElementAtPoint':
+            highlightElementAtPoint(msg.mx, msg.my);
+            break;
+        case 'unhighlight':
+            highlightElements([]);
+            break;
+        case 'filterElementAtPoint':
+            filterElementAtPoint(msg.mx, msg.my, msg.broad);
+            break;
+        case 'zapElementAtPoint':
+            zapElementAtPoint(msg.mx, msg.my, msg.options);
+            if ( msg.options.highlight !== true && msg.options.stay !== true ) {
+                quitPicker();
+            }
+            break;
+        case 'togglePreview':
+            filterToDOMInterface.preview(msg.state);
+            if ( msg.state === false ) {
+                highlightElements(targetElements, true);
+            }
+            break;
+        default:
+            break;
+    }
+};
+
+/******************************************************************************/
+
+// epicker-ui.html will be injected in the page through an iframe, and
+// is a sandboxed so as to prevent the page from interfering with its
+// content and behavior.
+//
+// The purpose of epicker.js is to:
+// - Install the element picker UI, and wait for the component to establish
+//   a direct communication channel.
+// - Lookup candidate filters from elements at a specific position.
+// - Highlight element(s) at a specific position or according to whether
+//   they match candidate filters;
+// - Preview the result of applying a candidate filter;
+//
+// When the element picker is installed on a page, the only change the page
+// sees is an iframe with a random attribute. The page can't see the content
+// of the iframe, and cannot interfere with its style properties. However the
+// page can remove the iframe.
+
+// The DOM filterer will not be present when cosmetic filtering is disabled.
+const noCosmeticFiltering =
+    vAPI.domFilterer instanceof Object === false ||
+    vAPI.noSpecificCosmeticFiltering === true;
+
+// https://github.com/gorhill/uBlock/issues/1529
+//   In addition to inline styles, harden the element picker styles by using
+//   dedicated CSS rules.
+const pickerCSSStyle = [
+    'background: transparent',
+    'border: 0',
+    'border-radius: 0',
+    'box-shadow: none',
+    'color-scheme: light dark',
+    'display: block',
+    'filter: none',
+    'height: 100vh',
+    'left: 0',
+    'margin: 0',
+    'max-height: none',
+    'max-width: none',
+    'min-height: unset',
+    'min-width: unset',
+    'opacity: 1',
+    'outline: 0',
+    'padding: 0',
+    'pointer-events: auto',
+    'position: fixed',
+    'top: 0',
+    'transform: none',
+    'visibility: hidden',
+    'width: 100%',
+    'z-index: 2147483647',
+    ''
+].join(' !important;\n');
+
+
+const pickerCSS = `
+:root > [${pickerUniqueId}] {
+    ${pickerCSSStyle}
+}
+:root > [${pickerUniqueId}-loaded] {
+    visibility: visible !important;
+}
+:root [${pickerUniqueId}-clickblind] {
+    pointer-events: none !important;
+}
+`;
+
+vAPI.userStylesheet.add(pickerCSS);
+vAPI.userStylesheet.apply();
+
+let pickerBootArgs;
+let pickerFramePort = null;
+
+const bootstrap = async ( ) => {
+    pickerBootArgs = await vAPI.messaging.send('elementPicker', {
+        what: 'elementPickerArguments',
+    });
+    if ( typeof pickerBootArgs !== 'object' ) { return; }
+    if ( pickerBootArgs === null ) { return; }
+    // Restore net filter union data if origin is the same.
+    const eprom = pickerBootArgs.eprom || null;
+    if ( eprom !== null && eprom.lastNetFilterSession === lastNetFilterSession ) {
+        lastNetFilterHostname = eprom.lastNetFilterHostname || '';
+        lastNetFilterUnion = eprom.lastNetFilterUnion || '';
+    }
+    const url = new URL(pickerBootArgs.pickerURL);
+    if ( pickerBootArgs.zap ) {
+        url.searchParams.set('zap', '1');
+    }
+    return new Promise(resolve => {
+        const iframe = document.createElement('iframe');
+        iframe.setAttribute(pickerUniqueId, '');
+        document.documentElement.append(iframe);
+        iframe.addEventListener('load', ( ) => {
+            iframe.setAttribute(`${pickerUniqueId}-loaded`, '');
+            const channel = new MessageChannel();
+            pickerFramePort = channel.port1;
+            pickerFramePort.onmessage = ev => {
+                onDialogMessage(ev.data || {});
+            };
+            pickerFramePort.onmessageerror = ( ) => {
+                quitPicker();
+            };
+            iframe.contentWindow.postMessage(
+                { what: 'epickerStart' },
+                url.href,
+                [ channel.port2 ]
+            );
+            resolve(iframe);
+        }, { once: true });
+        iframe.contentWindow.location = url.href;
+    });
+};
+
+let pickerFrame = await bootstrap();
+if ( Boolean(pickerFrame) === false ) {
+    quitPicker();
+}
+
+/******************************************************************************/
+
+})();
+
+
+
+
+
+
+
+
+/*******************************************************************************
+
+    DO NOT:
+    - Remove the following code
+    - Add code beyond the following code
+    Reason:
+    - https://github.com/gorhill/uBlock/pull/3721
+    - uBO never uses the return value from injected content scripts
+
+**/
+
+void 0;