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// We are currently limited to ECMAScript 5 in this file, because it is being
// used in the browser tests. See https://issues.adblockplus.org/ticket/4796
var propertySelectorRegExp = /\[\-abp\-properties=(["'])([^"']+)\1\]/;
function splitSelector(selector)
{
if (selector.indexOf(",") == -1)
return [selector];
var selectors = [];
var start = 0;
var level = 0;
var sep = "";
for (var i = 0; i < selector.length; i++)
{
var chr = selector[i];
if (chr == "\\") // ignore escaped characters
i++;
else if (chr == sep) // don't split within quoted text
sep = ""; // e.g. [attr=","]
else if (sep == "")
{
if (chr == '"' || chr == "'")
sep = chr;
else if (chr == "(") // don't split between parentheses
level++; // e.g. :matches(div,span)
else if (chr == ")")
level = Math.max(0, level - 1);
else if (chr == "," && level == 0)
{
selectors.push(selector.substring(start, i));
start = i + 1;
}
}
}
selectors.push(selector.substring(start));
return selectors;
}
function ElemHideEmulation(window, getFiltersFunc, addSelectorsFunc)
{
this.window = window;
this.getFiltersFunc = getFiltersFunc;
this.addSelectorsFunc = addSelectorsFunc;
}
ElemHideEmulation.prototype = {
stringifyStyle: function(style)
{
var styles = [];
for (var i = 0; i < style.length; i++)
{
var property = style.item(i);
var value = style.getPropertyValue(property);
var priority = style.getPropertyPriority(property);
styles.push(property + ": " + value + (priority ? " !" + priority : "") + ";");
}
styles.sort();
return styles.join(" ");
},
isSameOrigin: function(stylesheet)
{
try
{
return new URL(stylesheet.href).origin == this.window.location.origin;
}
catch (e)
{
// Invalid URL, assume that it is first-party.
return true;
}
},
findSelectors: function(stylesheet, selectors, filters)
{
// Explicitly ignore third-party stylesheets to ensure consistent behavior
// between Firefox and Chrome.
if (!this.isSameOrigin(stylesheet))
return;
var rules = stylesheet.cssRules;
if (!rules)
return;
for (var i = 0; i < rules.length; i++)
{
var rule = rules[i];
if (rule.type != rule.STYLE_RULE)
continue;
var style = this.stringifyStyle(rule.style);
for (var j = 0; j < this.patterns.length; j++)
{
var pattern = this.patterns[j];
if (pattern.regexp.test(style))
{
var subSelectors = splitSelector(rule.selectorText);
for (var k = 0; k < subSelectors.length; k++)
{
var subSelector = subSelectors[k];
selectors.push(pattern.prefix + subSelector + pattern.suffix);
filters.push(pattern.text);
}
}
}
}
},
addSelectors: function(stylesheets)
{
var selectors = [];
var filters = [];
for (var i = 0; i < stylesheets.length; i++)
this.findSelectors(stylesheets[i], selectors, filters);
this.addSelectorsFunc(selectors, filters);
},
onLoad: function(event)
{
var stylesheet = event.target.sheet;
if (stylesheet)
this.addSelectors([stylesheet]);
},
apply: function()
{
this.getFiltersFunc(function(patterns)
{
this.patterns = [];
for (var i = 0; i < patterns.length; i++)
{
var pattern = patterns[i];
var match = propertySelectorRegExp.exec(pattern.selector);
if (!match)
continue;
var propertyExpression = match[2];
var regexpString;
if (propertyExpression.length >= 2 && propertyExpression[0] == "/" &&
propertyExpression[propertyExpression.length - 1] == "/")
regexpString = propertyExpression.slice(1, -1)
.replace("\\x7B ", "{").replace("\\x7D ", "}");
else
regexpString = filterToRegExp(propertyExpression);
this.patterns.push({
text: pattern.text,
regexp: new RegExp(regexpString, "i"),
prefix: pattern.selector.substr(0, match.index),
suffix: pattern.selector.substr(match.index + match[0].length)
});
}
if (this.patterns.length > 0)
{
var document = this.window.document;
this.addSelectors(document.styleSheets);
document.addEventListener("load", this.onLoad.bind(this), true);
}
}.bind(this));
}
};
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