/* Copyright (C) 2011 Free Software Foundation, Inc.
   
   This file is part of the GNUstep Library.
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library 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
   Library General Public License for more details.
   
   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02111 USA.
*/

#import "Foundation/NSException.h"
#import "Foundation/NSTextCheckingResult.h"
#import "Foundation/NSRegularExpression.h"
#import "GNUstepBase/NSObject+GNUstepBase.h"

/**
 * Private class encapsulating a regular expression match.
 */
@interface GSRegularExpressionCheckingResult : NSTextCheckingResult
{
  // TODO: This could be made more efficient by adding a variant that only
  // contained a single range.
@public
  /** The number of ranges matched */
  NSUInteger rangeCount;
  /** The array of ranges. */
  NSRange *ranges;
  /** The regular expression object that generated this match. */
  NSRegularExpression *regularExpression;
}
@end

@implementation NSTextCheckingResult
+ (NSTextCheckingResult*)regularExpressionCheckingResultWithRanges: (NSRangePointer)ranges
                                                             count: (NSUInteger)count
                                                 regularExpression: (NSRegularExpression*)regularExpression
{
  GSRegularExpressionCheckingResult *result =
    [GSRegularExpressionCheckingResult new];

  result->rangeCount = count;
  result->ranges = calloc(sizeof(NSRange), count);
  memcpy(result->ranges, ranges, (sizeof(NSRange) * count));
  ASSIGN(result->regularExpression, regularExpression);
  return [result autorelease];
}

- (NSDictionary*)addressComponents { return nil; }
- (NSDictionary*)components { return nil; }
- (NSDate*)date { return nil; }
- (NSTimeInterval) duration { return 0; }
- (NSArray*)grammarDetails { return 0; }
- (NSUInteger) numberOfRanges { return 1; }
- (NSOrthography*)orthography { return nil; }
- (NSString*)phoneNumber { return nil; }
- (NSRange)range
{
  [self subclassResponsibility: _cmd];
  return NSMakeRange(NSNotFound, 0);
}
- (NSRegularExpression*)regularExpression { return nil; }
- (NSString*)replacementString { return nil; }
- (NSTextCheckingType)resultType
{
  [self subclassResponsibility: _cmd];
  return -1;
}
- (NSTimeZone*)timeZone { return nil; }
- (NSURL*)URL { return nil; }

- (NSRange)rangeAtIndex: (NSUInteger)idx
{
  if (idx >= [self numberOfRanges])
    {
      [NSException raise: NSInvalidArgumentException
		  format: @"index %"PRIuPTR" out of range", (unsigned long)idx];
    }
  return [self range];
}

- (NSTextCheckingResult *)resultByAdjustingRangesWithOffset: (NSInteger)offset
{
  [self subclassResponsibility: _cmd];
  return nil;
}
@end



@implementation GSRegularExpressionCheckingResult

- (void)dealloc
{
  [regularExpression release];
  free(ranges);
  [super dealloc];
}

- (NSUInteger)numberOfRanges
{
  return rangeCount;
}

- (NSRange)range
{
  return ranges[0];
}

- (NSRange)rangeAtIndex: (NSUInteger)idx
{
  if (idx >= rangeCount)
    {
      [NSException raise: NSInvalidArgumentException
		  format: @"index %"PRIuPTR" out of range", (unsigned long)idx];
    }
  return ranges[idx];
}

- (NSRegularExpression *)regularExpression
{
  return regularExpression;
}

- (NSTextCheckingType)resultType
{
  return NSTextCheckingTypeRegularExpression;
}

- (NSTextCheckingResult *)resultByAdjustingRangesWithOffset: (NSInteger)offset
{
  NSUInteger i;
  GSRegularExpressionCheckingResult *result =
    [[GSRegularExpressionCheckingResult new] autorelease];

  result->rangeCount = rangeCount;
  result->ranges = calloc(sizeof(NSRange), rangeCount);
  for (i = 0; i < rangeCount; i++)
    {
      NSRange r = ranges[i];
      if ((offset > 0 && NSNotFound - r.location <= offset) ||
          (offset < 0 && r.location < -offset))
	{
	  [NSException raise: NSInvalidArgumentException
		      format: @"Invalid offset %"PRIdPTR" for range: %@",
		       offset, NSStringFromRange(r)];
	}
      r.location += offset;
      result->ranges[i] = r;
    }
  ASSIGN(result->regularExpression, regularExpression);
  return result;
}

@end
