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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_PREDICATE_H_
#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_PREDICATE_H_
#include <memory>
#include <string>
#include "base/macros.h"
namespace base {
class Value;
}
namespace extensions {
class ContentPredicateEvaluator;
class Extension;
// Represents a predicate that is part of a declarative rule condition in the
// Declarative Content API. This is created and can be evaluated by its
// associated ContentPredicateEvaluator subclass.
//
// For example, given the sample code at
// https://developer.chrome.com/extensions/declarativeContent#rules, the
// entities { hostEquals: 'www.google.com', schemes: ['https'] } and
// ["input[type='password']"] are both represented by ContentPredicate
// subclasses.
class ContentPredicate {
public:
virtual ~ContentPredicate();
// Returns true if this predicate should be ignored during evaluation. By
// default predicates are not ignored.
virtual bool IsIgnored() const;
// Returns the evaluator associated with this predicate.
virtual ContentPredicateEvaluator* GetEvaluator() const = 0;
protected:
ContentPredicate();
private:
DISALLOW_COPY_AND_ASSIGN(ContentPredicate);
};
// Defines the interface for objects that create predicates.
//
// Given the sample code at
// https://developer.chrome.com/extensions/declarativeContent#rules,
// ContentPredicateFactories are directly responsible for creating individual
// predicates from the { hostEquals: 'www.google.com', schemes: ['https'] } and
// ["input[type='password']"] JSON entities encoded in |value|.
class ContentPredicateFactory {
public:
virtual ~ContentPredicateFactory();
// Creates a new predicate from |value|, as specified in the declarative
// API. Sets *|error| and returns null if creation failed for any reason.
virtual std::unique_ptr<const ContentPredicate> CreatePredicate(
const Extension* extension,
const base::Value& value,
std::string* error) = 0;
protected:
ContentPredicateFactory();
private:
DISALLOW_COPY_AND_ASSIGN(ContentPredicateFactory);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_PREDICATE_H_
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