uBlock/js/element-picker.js

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2014-07-12 18:32:44 -06:00
/*******************************************************************************
µBlock - a Chromium browser extension to block requests.
Copyright (C) 2014 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, chrome */
/******************************************************************************/
/******************************************************************************/
/*! http://mths.be/cssescape v0.2.1 by @mathias | MIT license */
;(function(root) {
if (!root.CSS) {
root.CSS = {};
}
var CSS = root.CSS;
var InvalidCharacterError = function(message) {
this.message = message;
};
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InvalidCharacterError.prototype = new Error();
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InvalidCharacterError.prototype.name = 'InvalidCharacterError';
if (!CSS.escape) {
// http://dev.w3.org/csswg/cssom/#serialize-an-identifier
CSS.escape = function(value) {
var string = String(value);
var length = string.length;
var index = -1;
var codeUnit;
var result = '';
var firstCodeUnit = string.charCodeAt(0);
while (++index < length) {
codeUnit = string.charCodeAt(index);
// Note: theres no need to special-case astral symbols, surrogate
// pairs, or lone surrogates.
// If the character is NULL (U+0000), then throw an
// `InvalidCharacterError` exception and terminate these steps.
if (codeUnit === 0x0000) {
throw new InvalidCharacterError(
'Invalid character: the input contains U+0000.'
);
}
if (
// If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
// U+007F, […]
(codeUnit >= 0x0001 && codeUnit <= 0x001F) || codeUnit == 0x007F ||
// If the character is the first character and is in the range [0-9]
// (U+0030 to U+0039), […]
(index === 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
// If the character is the second character and is in the range [0-9]
// (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
(
index == 1 &&
codeUnit >= 0x0030 && codeUnit <= 0x0039 &&
firstCodeUnit == 0x002D
)
) {
// http://dev.w3.org/csswg/cssom/#escape-a-character-as-code-point
result += '\\' + codeUnit.toString(16) + ' ';
continue;
}
// If the character is not handled by one of the above rules and is
// greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
// is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
// U+005A), or [a-z] (U+0061 to U+007A), […]
if (
codeUnit >= 0x0080 ||
codeUnit == 0x002D ||
codeUnit == 0x005F ||
codeUnit >= 0x0030 && codeUnit <= 0x0039 ||
codeUnit >= 0x0041 && codeUnit <= 0x005A ||
codeUnit >= 0x0061 && codeUnit <= 0x007A
) {
// the character itself
result += string.charAt(index);
continue;
}
// Otherwise, the escaped character.
// http://dev.w3.org/csswg/cssom/#escape-a-character
result += '\\' + string.charAt(index);
}
return result;
};
}
}(typeof global != 'undefined' ? global : this));
/******************************************************************************/
/******************************************************************************/
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// Cut & pasted here from reference implementation in messaging-client.js
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// because this is an injected script.
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var messaging = (function(name){
var port = null;
var requestId = 1;
var requestIdToCallbackMap = {};
var listenCallback = null;
var onPortMessage = function(details) {
if ( typeof details.id !== 'number' ) {
return;
}
// Announcement?
if ( details.id < 0 ) {
if ( listenCallback ) {
listenCallback(details.msg);
}
return;
}
var callback = requestIdToCallbackMap[details.id];
if ( !callback ) {
return;
}
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// Must be removed before calling client to be sure to not execute
// callback again if the client stops the messaging service.
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delete requestIdToCallbackMap[details.id];
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callback(details.msg);
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};
var start = function(name) {
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port = chrome.runtime.connect({ name: name });
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port.onMessage.addListener(onPortMessage);
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// https://github.com/gorhill/uBlock/issues/193
port.onDisconnect.addListener(stop);
};
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var stop = function() {
listenCallback = null;
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port.disconnect();
port = null;
flushCallbacks();
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};
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if ( typeof name === 'string' && name !== '' ) {
start(name);
}
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var ask = function(msg, callback) {
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if ( port === null ) {
if ( typeof callback === 'function' ) {
callback();
}
return;
}
if ( callback === undefined ) {
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tell(msg);
return;
}
var id = requestId++;
port.postMessage({ id: id, msg: msg });
requestIdToCallbackMap[id] = callback;
};
var tell = function(msg) {
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if ( port !== null ) {
port.postMessage({ id: 0, msg: msg });
}
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};
var listen = function(callback) {
listenCallback = callback;
};
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var flushCallbacks = function() {
var callback;
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for ( var id in requestIdToCallbackMap ) {
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if ( requestIdToCallbackMap.hasOwnProperty(id) === false ) {
continue;
}
callback = requestIdToCallbackMap[id];
if ( !callback ) {
continue;
}
// Must be removed before calling client to be sure to not execute
// callback again if the client stops the messaging service.
delete requestIdToCallbackMap[id];
callback();
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}
};
return {
start: start,
stop: stop,
ask: ask,
tell: tell,
listen: listen
};
})('element-picker.js');
/******************************************************************************/
/******************************************************************************/
(function() {
/******************************************************************************/
var µBlockClassName = CSS.escape('µBlock');
var svgns = 'http://www.w3.org/2000/svg';
var pickerRoot = null;
var svgRoot = null;
var svgOcean = null;
var svgIslands = null;
var divDialog = null;
var taCandidate = null;
var targetElements = [];
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var svgWidth = 0;
var svgHeight = 0;
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/******************************************************************************/
var pickerPaused = function() {
return /(^| )paused( |$)/.test(pickerRoot.className);
};
/******************************************************************************/
var pausePicker = function() {
pickerRoot.className += ' paused';
};
/******************************************************************************/
var unpausePicker = function() {
pickerRoot.className = pickerRoot.className.replace(/(^| )paused( |$)/g, '').trim();
};
/******************************************************************************/
var pickerRootDistance = function(elem) {
var distance = 0;
while ( elem ) {
if ( elem === pickerRoot ) {
return distance;
}
elem = elem.parentNode;
distance += 1;
}
return -1;
};
/******************************************************************************/
var highlightElements = function(elems, force) {
// To make mouse move handler more efficient
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if ( !force && elems.length === targetElements.length ) {
if ( elems.length === 0 || elems[0] === targetElements[0] ) {
return;
}
}
targetElements = elems;
var offx = window.pageXOffset;
var offy = window.pageYOffset;
var ow = svgRoot.getAttribute('width');
var ocean = [
'M0 0',
'h', ow,
'v', svgRoot.getAttribute('height'),
'h-', ow,
'z'
];
var islands = [];
var elem, r;
for ( var i = 0; i < elems.length; i++ ) {
elem = elems[i];
if ( typeof elem.getBoundingClientRect !== 'function' ) {
continue;
}
r = elem.getBoundingClientRect();
ocean.push(
'M', r.left + offx, ' ', r.top + offy,
'h', r.width,
'v', r.height,
'h-', r.width,
'z'
);
islands.push(
'M', r.left + offx, ' ', r.top + offy,
'h', r.width,
'v', r.height,
'h-', r.width,
'z'
);
}
svgOcean.setAttribute('d', ocean.join(''));
svgIslands.setAttribute('d', islands.join(''));
};
/******************************************************************************/
var removeElements = function(elems) {
var i = elems.length, elem;
while ( i-- ) {
elem = elems[i];
if ( elem.parentNode ) {
elem.parentNode.removeChild(elem);
}
}
};
/******************************************************************************/
// Extract the best possible net filter, i.e. as specific as possible.
var netFilterFromElement = function(elem) {
if ( elem === null ) {
return;
}
if ( elem.nodeType !== 1 ) {
return;
}
var tagName = elem.tagName.toLowerCase();
if ( tagName !== 'img' && tagName !== 'iframe' ) {
return;
}
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var src = elem.getAttribute('src');
if ( typeof src !== 'string' || src.length === 0 ) {
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return;
}
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return src.replace(/^https?:\/\//, '||').replace(/\?.*$/, '');
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};
/******************************************************************************/
// Extract the best possible cosmetic filter, i.e. as specific as possible.
var cosmeticFilterFromElement = function(elem) {
if ( elem === null ) {
return;
}
if ( elem.nodeType !== 1 ) {
return;
}
var tagName = elem.tagName.toLowerCase();
var prefix = '';
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var suffix = [];
var v;
// Id
v = typeof elem.id === 'string' && CSS.escape(elem.id);
if ( v ) {
suffix.push('#', v);
}
// Class(es)
v = typeof elem.className === 'string' && elem.className.trim();
if ( v.length ) {
v = v.split(/\s+/);
var i = v.length;
while ( i-- ) {
v[i] = CSS.escape(v[i]);
}
suffix.push('.', v.join('.'));
}
if ( suffix.length === 0 ) {
prefix = tagName;
}
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// Attributes (depends on tag name)
var attributes = [], attr;
switch ( tagName ) {
case 'a':
v = elem.getAttribute('href');
if ( v ) {
v = v.replace(/\?.*$/, '');
}
attributes.push({ k: 'href', v: v });
break;
case 'img':
v = elem.getAttribute('alt');
if ( v && v.length !== 0 ) {
attributes.push({ k: 'alt', v: v });
}
break;
default:
break;
}
while ( attr = attributes.pop() ) {
if ( attr.v.length === 0 ) {
continue;
}
v = elem.getAttribute(attr.k);
if ( attr.v === v ) {
suffix.push('[', attr.k, '="', attr.v, '"]');
} else if ( v.indexOf(attr.v) === 0 ) {
suffix.push('[', attr.k, '^="', attr.v, '"]');
} else {
suffix.push('[', attr.k, '*="', attr.v, '"]');
}
}
return '##' + prefix + suffix.join('');
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};
/******************************************************************************/
var selectorFromCandidate = function() {
var selector = '';
var v = taCandidate.value;
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if ( v.slice(0, 2) === '##' ) {
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selector = v.replace('##', '');
} else {
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if ( v.slice(0, 2) === '||' ) {
v = v.replace('||', '');
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}
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selector = '[src*="' + v + '"]';
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}
try {
if ( document.querySelector(selector) === null ) {
return '';
}
}
catch (e) {
return '';
}
return selector;
};
/******************************************************************************/
var userFilterFromCandidate = function() {
if ( selectorFromCandidate() === '' ) {
return false;
}
var v = taCandidate.value;
// Cosmetic filter?
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if ( v.slice(0, 2) === '##' ) {
return window.location.hostname + v;
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}
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// If domain included in filter, no need for domain option
if ( v.slice(0, 2) === '||' ) {
return v;
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}
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// Assume net filter
return v + '$domain=' + window.location.hostname;
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};
/******************************************************************************/
var onCandidateChanged = function(ev) {
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var selector = selectorFromCandidate();
divDialog.querySelector('#create').disabled = selector === '';
if ( selector === '' ) {
highlightElements([]);
return;
}
highlightElements(document.querySelectorAll(selector));
};
/******************************************************************************/
var candidateFromClickEvent = function(ev) {
var target = ev.target;
if ( !target ) {
return '';
}
// Bare
if ( ev.ctrlKey || ev.metaKey ) {
return target.textContent;
}
// For net filters there no such thing as a path
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if ( target.textContent.charAt(0) !== '#' ) {
return target.textContent;
}
// Return path: the target element, then all siblings prepended
var selector = [];
while ( target ) {
if ( target.nodeType !== 1 || target.tagName.toLowerCase() !== 'li' ) {
continue;
}
selector.unshift(target.textContent.replace(/^##/, ''));
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// Stop at any element with an id: these are unique in a web page
if ( target.textContent.slice(0, 3) === '###' ) {
break;
}
target = target.nextSibling;
}
return '##' + selector.join(' > ');
};
/******************************************************************************/
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var onDialogClicked = function(ev) {
if ( ev.target === null ) {
/* do nothing */
}
else if ( ev.target.id === 'create' ) {
var filter = userFilterFromCandidate();
if ( filter ) {
messaging.tell({ what: 'createUserFilter', filters: filter });
removeElements(document.querySelectorAll(selectorFromCandidate()));
stopPicker();
}
}
else if ( ev.target.id === 'pick' ) {
unpausePicker();
}
else if ( ev.target.id === 'quit' ) {
stopPicker();
}
else if ( ev.target.tagName.toLowerCase() === 'li' && pickerRootDistance(ev.target) === 5 ) {
taCandidate.value = candidateFromClickEvent(ev);
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onCandidateChanged();
}
ev.stopPropagation();
ev.preventDefault();
};
/******************************************************************************/
var removeAllChildren = function(parent) {
while ( parent.firstChild ) {
parent.removeChild(parent.firstChild);
}
};
/******************************************************************************/
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// TODO: for convenience I could provide a small set of net filters instead
// of just a single one. Truncating the right-most part of the path etc.
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var showDialog = function(filters) {
var divNet = divDialog.querySelector('ul > li:nth-of-type(1) > ul');
var divCosmetic = divDialog.querySelector('ul > li:nth-of-type(2) > ul');
removeAllChildren(divCosmetic);
removeAllChildren(divNet);
var filter, li;
for ( var i = 0; i < filters.length; i++ ) {
filter = filters[i];
li = document.createElement('li');
li.textContent = filter;
if ( filter.indexOf('##') === 0 ) {
divCosmetic.appendChild(li);
} else {
divNet.appendChild(li);
}
}
divDialog.querySelector('ul > li:nth-of-type(1)').style.display = divNet.firstChild ? '' : 'none';
divDialog.querySelector('ul > li:nth-of-type(2)').style.display = divCosmetic.firstChild ? '' : 'none';
divDialog.querySelector('ul').style.display = divNet.firstChild || divCosmetic.firstChild ? '' : 'none';
taCandidate.value = '';
divDialog.querySelector('#create').disabled = true;
pausePicker();
};
/******************************************************************************/
var onSvgHovered = function(ev) {
if ( pickerPaused() ) {
return;
}
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svgRoot.style.pointerEvents = 'none';
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var elem = document.elementFromPoint(ev.clientX, ev.clientY);
if ( elem == document.body || elem === document.documentElement ) {
elem = null;
}
highlightElements(elem ? [elem] : []);
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svgRoot.style.pointerEvents = 'auto';
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};
/******************************************************************************/
var onSvgClicked = function() {
if ( pickerPaused() ) {
return;
}
var filter;
var filters = [];
for ( var elem = targetElements[0]; elem && elem !== document.body; elem = elem.parentNode ) {
if ( filter = cosmeticFilterFromElement(elem) ) {
filters.push(filter);
}
if ( filter = netFilterFromElement(elem) ) {
filters.push(filter);
}
}
showDialog(filters);
};
/******************************************************************************/
var onKeyPressed = function(ev) {
if ( ev.key === 27 || ev.keyCode === 27 ) {
ev.stopPropagation();
ev.preventDefault();
stopPicker();
}
};
/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/190
// May need to dynamically adjust the height of the overlay + new position
// of highlighted elements.
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var onScrolled = function(ev) {
var newHeight = this.scrollY + this.innerHeight;
if ( newHeight > svgHeight ) {
svgHeight = newHeight;
svgRoot.setAttribute('height', svgHeight);
svgRoot.setAttribute("viewBox", '0 0 ' + svgWidth + ' ' + svgHeight);
}
highlightElements(targetElements, true);
};
/******************************************************************************/
var stopPicker = function() {
if ( pickerRoot !== null ) {
document.removeEventListener('keydown', onKeyPressed);
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window.removeEventListener('scroll', onScrolled);
taCandidate.removeEventListener('input', onCandidateChanged);
divDialog.removeEventListener('click', onDialogClicked);
svgRoot.removeEventListener('mousemove', onSvgHovered);
svgRoot.removeEventListener('click', onSvgClicked);
document.body.removeChild(pickerRoot);
pickerRoot = divDialog = svgRoot = svgOcean = svgIslands = taCandidate = null;
messaging.stop();
}
targetElements = [];
};
/******************************************************************************/
var startPicker = function() {
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pickerRoot = document.querySelector('.' + µBlockClassName);
if ( pickerRoot !== null ) {
return;
}
pickerRoot = document.createElement('div');
pickerRoot.className = µBlockClassName;
var pickerStyle = document.createElement('style');
pickerStyle.setAttribute('scoped', '');
pickerStyle.textContent = [
'.µBlock {',
'position: absolute;',
'top: 0;',
'left: 0;',
'}',
'.µBlock, .µBlock * {',
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'background: transparent;',
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'border: 0;',
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'color: #000;',
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'font: 12px sans-serif;',
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'margin: 0;',
'outline: 0;',
'overflow: visible;',
'padding: 0;',
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'text-transform: none;',
'vertical-align: baseline;',
'}',
'.µBlock button {',
'border: 1px solid #aaa;',
'padding: 6px 8px 4px 8px;',
'box-sizing: border-box;',
'box-shadow: none;',
'border-radius: 3px;',
'display: inline;',
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'line-height: 1;',
'color: #444;',
'background-color: #ccc;',
'cursor: pointer;',
'}',
'.µBlock button:hover {',
'background-color: #eee;',
'}',
'.µBlock button:disabled {',
'color: #999;',
'background-color: #ccc;',
'}',
'.µBlock > svg {',
'position: absolute;',
'top: 0;',
'left: 0;',
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'pointer-events: auto;',
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'cursor: crosshair;',
'z-index: 4999999999;',
'}',
'.µBlock.paused > svg {',
'cursor: wait;',
'}',
'.µBlock > svg > path:first-child {',
'fill: rgba(0,0,0,0.75);',
'fill-rule: evenodd;',
'}',
'.µBlock > svg > path + path {',
'stroke: #F00;',
'stroke-width: 0.5px;',
'fill: rgba(255,0,0,0.25);',
'}',
'.µBlock > div {',
'padding: 4px;',
'display: none;',
'position: fixed;',
'right: 4px;',
'bottom: 4px;',
'width: 30em;',
'font: 12px sans-serif;',
'background-color: rgba(255,255,255,0.9);',
'z-index: 5999999999;',
'}',
'.µBlock.paused > div {',
'display: initial;',
'}',
'.µBlock > div > div {',
'padding: 0;',
'box-sizing: border-box;',
'width: 100%;',
'height: 8em;',
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'position: relative;',
'}',
'.µBlock > div > div > textarea {',
'border: 1px solid #ccc;',
'padding: 2px;',
'box-sizing: border-box;',
'width: 100%;',
'height: 100%;',
'overflow: hidden;',
'resize: none;',
'background-color: white;',
'font: 11px monospace;',
'}',
'.µBlock > div > div > div {',
'position: absolute;',
'right: 2px;',
'bottom: 2px;',
'opacity: 0.2;',
'}',
'.µBlock > div > div > div:hover {',
'opacity: 1;',
'}',
'.µBlock > div > div > div > * {',
'margin-left: 3px;',
'}',
'.µBlock > div > ul {',
'margin: 0;',
'border: 1px solid #ccc;',
'padding: 3px;',
'list-style-type: none;',
'text-align: left;',
'overflow: hidden;',
'}',
'.µBlock > div > ul > li > ul {',
'margin: 0 0 0 1em;',
'list-style-type: none;',
'text-align: left;',
'background-color: #eee;',
'overflow: hidden;',
'}',
'.µBlock > div > ul > li > ul > li {',
'font: 11px monospace;',
'white-space: nowrap;',
'cursor: pointer;',
'}',
'.µBlock > div > ul > li > ul > li:hover {',
'background-color: rgba(255,255,255,1.0);',
'}',
''
].join('\n');
pickerRoot.appendChild(pickerStyle);
svgRoot = document.createElementNS(svgns, 'svg');
svgRoot.innerHTML = '<path /><path />';
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svgWidth = document.documentElement.scrollWidth;
svgHeight = Math.max(
document.documentElement.scrollHeight,
window.scrollY + window.innerHeight
);
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svgRoot.setAttribute('x', 0);
svgRoot.setAttribute('y', 0);
svgRoot.setAttribute('width', svgWidth);
svgRoot.setAttribute('height', svgHeight);
svgRoot.setAttribute("viewBox", '0 0 ' + svgWidth + ' ' + svgHeight);
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svgOcean = svgRoot.querySelector('path:first-child');
svgIslands = svgRoot.querySelector('path + path');
pickerRoot.appendChild(svgRoot);
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// TODO: do not rely on element ids, they could collide with whatever
// is used in the page. Just use built-in hierarchy of elements as
// selectors.
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divDialog = document.createElement('div');
divDialog.innerHTML = [
'<div>',
'<textarea spellcheck="false"></textarea>',
'<div>',
'<button id="create" type="button" disabled>.</button>',
'<button id="pick" type="button">.</button>',
'<button id="quit" type="button">.</button>',
'</div>',
'</div>',
'<ul>',
'<li>.<ul></ul>',
'<li>.<ul></ul>',
'</ul>',
''
].join('');
pickerRoot.appendChild(divDialog);
document.body.appendChild(pickerRoot);
svgRoot.addEventListener('click', onSvgClicked);
svgRoot.addEventListener('mousemove', onSvgHovered);
divDialog.addEventListener('click', onDialogClicked);
taCandidate = divDialog.querySelector('textarea');
taCandidate.addEventListener('input', onCandidateChanged);
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window.addEventListener('scroll', onScrolled);
document.addEventListener('keydown', onKeyPressed);
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};
/******************************************************************************/
startPicker();
/******************************************************************************/
messaging.ask({ what: 'i18n' }, function(details) {
divDialog.querySelector('#create').firstChild.nodeValue = details.create;
divDialog.querySelector('#pick').firstChild.nodeValue = details.pick;
divDialog.querySelector('#quit').firstChild.nodeValue = details.quit;
divDialog.querySelector('ul > li:nth-of-type(1)').firstChild.nodeValue = details.netFilters;
divDialog.querySelector('ul > li:nth-of-type(2)').firstChild.nodeValue = details.cosmeticFilters;
});
/******************************************************************************/
})();