/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import "NSExpression+FBFormat.h"

#import "FBElementUtils.h"

@implementation NSExpression (FBFormat)

+ (instancetype)fb_wdExpressionWithExpression:(NSExpression *)input
{
  if ([input expressionType] != NSKeyPathExpressionType) {
    return input;
  }
  
  NSString *propName = [input keyPath];
  NSUInteger dotPos = [propName rangeOfString:@"."].location;
  NSString *wdPropName;
  if (NSNotFound == dotPos) {
    wdPropName = [FBElementUtils wdAttributeNameForAttributeName:propName];
  } else {
    NSString *actualPropName = [propName substringToIndex:dotPos];
    NSString *suffix = [propName substringFromIndex:(dotPos + 1)];
    wdPropName = [NSString stringWithFormat:@"%@.%@", [FBElementUtils wdAttributeNameForAttributeName:actualPropName], suffix];
  }
  return [NSExpression expressionForKeyPath:wdPropName];
}

@end