createTextEdit - diff two text versions and create TextEdit

< > BotCompany Repo | #1009713 // createTextEdit - diff two text versions and create TextEdit - with verification

JavaX fragment (include)

static TextEdit createTextEdit(S text, S newText) {
  S a = text, b = newText;
  int i = lCommonPrefix(a, b);
  if (i == l(a) && i == l(b)) null; // Strings are equal
  a = substring(a, i);
  b = substring(b, i);
  int j = lCommonSuffix(a, b);
  a = substring(a, 0, l(a)-j);
  b = substring(b, 0, l(b)-j);
  
  // Now differing part remains in a and b;
  // i and j give length of unchanged beginning+end
  if (empty(a) && empty(b)) null;
  
  TextEdit edit = nuWithParams(TextEdit, 
    startIndex := i, endIndex := i+l(a), text := b);

  // Verify!
  assertEquals(newText, replayTextEdit(edit, text));
  
  ret edit;
}

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Snippet ID:

#1009713

Snippet name:

createTextEdit - diff two text versions and create TextEdit - with verification

Eternal ID of this version:

#1009713/2

Text MD5:

2abc1f6a535112115a64461eb7333c9a

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2017-08-14 23:14:18

Source code size:

641 bytes / 22 lines

Pitched / IR pitched:

No / No

Views / Downloads:

505 / 545

Version history:

1 change(s)

Referenced in:

[show references]

1	static TextEdit createTextEdit(S text, S newText) {
2	S a = text, b = newText;
3	int i = lCommonPrefix(a, b);
4	if (i == l(a) && i == l(b)) null; // Strings are equal
5	a = substring(a, i);
6	b = substring(b, i);
7	int j = lCommonSuffix(a, b);
8	a = substring(a, 0, l(a)-j);
9	b = substring(b, 0, l(b)-j);
10
11	// Now differing part remains in a and b;
12	// i and j give length of unchanged beginning+end
13	if (empty(a) && empty(b)) null;
14
15	TextEdit edit = nuWithParams(TextEdit,
16	startIndex := i, endIndex := i+l(a), text := b);
17
18	// Verify!
19	assertEquals(newText, replayTextEdit(edit, text));
20
21	ret edit;
22	}