ios/web/web_state/ui/web_view_js_utils.h

// Copyright 2014 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 IOS_WEB_WEB_STATE_UI_WEB_VIEW_JS_UTILS_H_
#define IOS_WEB_WEB_STATE_UI_WEB_VIEW_JS_UTILS_H_

#import <Foundation/Foundation.h>
#include <memory>

#import "ios/web/public/block_types.h"

@class WKWebView;

namespace base {
class Value;
}  // namespace base

namespace web {

// The domain for JS evaluation NSErrors in web.
extern NSString* const kJSEvaluationErrorDomain;

// The maximum recursion depth when parsing JS results.
extern int const kMaximumParsingRecursionDepth;

// The type of errors that can occur while evaluating JS.
enum JSEvaluationErrorCode {
  // No web view present to evaluate JS.
  JS_EVALUATION_ERROR_CODE_NO_WEB_VIEW = -1000,
  // JS evaluation is not allowed for security reasons.
  JS_EVALUATION_ERROR_CODE_REJECTED = -1001,
};

// Converts result of WKWebView script evaluation to base::Value.
std::unique_ptr<base::Value> ValueResultFromWKResult(id result);

// Executes JavaScript on WKWebView. If the web view cannot execute JS at the
// moment, |completion_handler| is called with an NSError.
void ExecuteJavaScript(WKWebView* web_view,
                       NSString* script,
                       JavaScriptResultBlock completion_handler);

}  // namespace web

#endif  // IOS_WEB_WEB_STATE_UI_WEB_VIEW_JS_UTILS_H_