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/*

* Diff Match and Patch

* Copyright 2018 The diff-match-patch Authors.

* https://github.com/google/diff-match-patch

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*

* Author: fraser@google.com (Neil Fraser)

* ObjC port: jan@geheimwerk.de (Jan Weiß)

*/

#import <Foundation/Foundation.h>

/*

* Functions for diff, match and patch.

* Computes the difference between two texts to create a patch.

* Applies the patch onto another text, allowing for errors.

*/

/*

* The data structure representing a diff is an NSMutableArray of Diff objects:

* {Diff(Operation.DIFF_DELETE, "Hello"),

* Diff(Operation.DIFF_INSERT, "Goodbye"),

* Diff(Operation.DIFF_EQUAL, " world.")}

* which means: delete "Hello", add "Goodbye" and keep " world."

*/

typedef enum {

DIFF_DELETE = 1,

DIFF_INSERT = 2,

DIFF_EQUAL = 3

} Operation;

/*

* Class representing one diff operation.

*/

@interface Diff : NSObject <NSCopying> {

Operation operation; // One of: DIFF_INSERT, DIFF_DELETE or DIFF_EQUAL.

NSString *text; // The text associated with this diff operation.

}

@property (nonatomic, assign) Operation operation;

@property (nonatomic, copy) NSString *text;

+ (id)diffWithOperation:(Operation)anOperation andText:(NSString *)aText;

- (id)initWithOperation:(Operation)anOperation andText:(NSString *)aText;

@end

/*

* Class representing one patch operation.

*/

@interface Patch : NSObject <NSCopying> {

NSMutableArray *diffs;

NSUInteger start1;

NSUInteger start2;

NSUInteger length1;

NSUInteger length2;

}

@property (nonatomic, retain) NSMutableArray *diffs;

@property (nonatomic, assign) NSUInteger start1;

@property (nonatomic, assign) NSUInteger start2;

@property (nonatomic, assign) NSUInteger length1;

@property (nonatomic, assign) NSUInteger length2;

@end

/*

* Class containing the diff, match and patch methods.

* Also Contains the behaviour settings.

*/

@interface DiffMatchPatch : NSObject {

// Number of seconds to map a diff before giving up (0 for infinity).

NSTimeInterval Diff_Timeout;

// Cost of an empty edit operation in terms of edit characters.

NSUInteger Diff_EditCost;

// At what point is no match declared (0.0 = perfection, 1.0 = very loose).

double Match_Threshold;

// How far to search for a match (0 = exact location, 1000+ = broad match).

// A match this many characters away from the expected location will add

// 1.0 to the score (0.0 is a perfect match).

NSInteger Match_Distance;

// When deleting a large block of text (over ~64 characters), how close

// do the contents have to be to match the expected contents. (0.0 =

// perfection, 1.0 = very loose). Note that Match_Threshold controls

// how closely the end points of a delete need to match.

float Patch_DeleteThreshold;

// Chunk size for context length.

uint16_t Patch_Margin;

// The number of bits in an int.

NSUInteger Match_MaxBits;

}

@property (nonatomic, assign) NSTimeInterval Diff_Timeout;

@property (nonatomic, assign) NSUInteger Diff_EditCost;

@property (nonatomic, assign) double Match_Threshold;

@property (nonatomic, assign) NSInteger Match_Distance;

@property (nonatomic, assign) float Patch_DeleteThreshold;

@property (nonatomic, assign) uint16_t Patch_Margin;

- (NSMutableArray *)diff_mainOfOldString:(NSString *)text1 andNewString:(NSString *)text2;

- (NSMutableArray *)diff_mainOfOldString:(NSString *)text1 andNewString:(NSString *)text2 checkLines:(BOOL)checklines;

- (NSUInteger)diff_commonPrefixOfFirstString:(NSString *)text1 andSecondString:(NSString *)text2;

- (NSUInteger)diff_commonSuffixOfFirstString:(NSString *)text1 andSecondString:(NSString *)text2;

- (void)diff_cleanupSemantic:(NSMutableArray *)diffs;

- (void)diff_cleanupSemanticLossless:(NSMutableArray *)diffs;

- (void)diff_cleanupEfficiency:(NSMutableArray *)diffs;

- (void)diff_cleanupMerge:(NSMutableArray *)diffs;

- (NSUInteger)diff_xIndexIn:(NSMutableArray *)diffs location:(NSUInteger) loc;

- (NSString *)diff_prettyHtml:(NSMutableArray *)diffs;

- (NSString *)diff_text1:(NSMutableArray *)diffs;

- (NSString *)diff_text2:(NSMutableArray *)diffs;

- (NSUInteger)diff_levenshtein:(NSMutableArray *)diffs;

- (NSString *)diff_toDelta:(NSMutableArray *)diffs;

- (NSMutableArray *)diff_fromDeltaWithText:(NSString *)text1 andDelta:(NSString *)delta error:(NSError **)error;

- (NSUInteger)match_mainForText:(NSString *)text pattern:(NSString *)pattern near:(NSUInteger)loc;

- (NSMutableDictionary *)match_alphabet:(NSString *)pattern;

- (NSMutableArray *)patch_makeFromOldString:(NSString *)text1 andNewString:(NSString *)text2;

- (NSMutableArray *)patch_makeFromDiffs:(NSMutableArray *)diffs;

- (NSMutableArray *)patch_makeFromOldString:(NSString *)text1 newString:(NSString *)text2 diffs:(NSMutableArray *)diffs;

- (NSMutableArray *)patch_makeFromOldString:(NSString *)text1 andDiffs:(NSMutableArray *)diffs;

- (NSMutableArray *)patch_deepCopy:(NSArray *)patches; // Copy rule applies!

- (NSArray *)patch_apply:(NSArray *)sourcePatches toString:(NSString *)text;

- (NSString *)patch_addPadding:(NSMutableArray *)patches;

- (void)patch_splitMax:(NSMutableArray *)patches;

- (NSString *)patch_toText:(NSMutableArray *)patches;

- (NSMutableArray *)patch_fromText:(NSString *)textline error:(NSError **)error;

@end

@interface DiffMatchPatch (PrivateMethods)

- (NSMutableArray *)diff_mainOfOldString:(NSString *)text1 andNewString:(NSString *)text2 checkLines:(BOOL)checklines deadline:(NSTimeInterval)deadline;

- (NSMutableArray *)diff_computeFromOldString:(NSString *)text1 andNewString:(NSString *)text2 checkLines:(BOOL)checklines deadline:(NSTimeInterval)deadline;

- (NSMutableArray *)diff_lineModeFromOldString:(NSString *)text1 andNewString:(NSString *)text2 deadline:(NSTimeInterval)deadline;

- (NSArray *)diff_linesToCharsForFirstString:(NSString *)text1 andSecondString:(NSString *)text2;

- (void)diff_chars:(NSArray *)diffs toLines:(NSMutableArray *)lineArray;

- (NSMutableArray *)diff_bisectOfOldString:(NSString *)text1 andNewString:(NSString *)text2 deadline:(NSTimeInterval)deadline;

- (NSMutableArray *)diff_bisectSplitOfOldString:(NSString *)text1 andNewString:(NSString *)text2 x:(NSUInteger)x y:(NSUInteger)y deadline:(NSTimeInterval)deadline;

- (NSUInteger)diff_commonOverlapOfFirstString:(NSString *)text1 andSecondString:(NSString *)text2;

- (NSArray *)diff_halfMatchOfFirstString:(NSString *)text1 andSecondString:(NSString *)text2;

- (NSArray *)diff_halfMatchIOfLongString:(NSString *)longtext andShortString:(NSString *)shorttext;

- (NSInteger)diff_cleanupSemanticScoreOfFirstString:(NSString *)one andSecondString:(NSString *)two;

- (NSUInteger)match_bitapOfText:(NSString *)text andPattern:(NSString *)pattern near:(NSUInteger)loc;

- (double)match_bitapScoreForErrorCount:(NSUInteger)e location:(NSUInteger)x near:(NSUInteger)loc pattern:(NSString *)pattern;

- (void)patch_addContextToPatch:(Patch *)patch sourceText:(NSString *)text;

@end