Similar Lines Detection
Similar Lines Detection is yet another advanced option available in Code Compare
Most available comparison algorithms search for strictly equal strings. Even if
a file contains only minor changes, the respective blocks will be treated as different
ones. Because of that, comparators can sometimes return incorrect results.
Code Compare Pro tool is fitted with a special solution for this problem. The Similar
Lines Detection feature detects approximately equal strings providing better comparison
This feature can function in either of two modes: a Common Mode and a Quick Mode.
The default setting is Quick Mode and most often it is your best choice. When in
Quick Mode the comparison tool disregards spaces and takes into account string length
only. If you disable the Quick Mode, the contents of the
strings will be compared.
Similar Lines Detection is enabled by default and can be turned off using the
Comparison Options menu. Click the
button and uncheck the Similar Lines Detection checkbox. Code Compare Pro
will then start using the usual comparison algorithm. You can also trigger the Quick
Mode for Similar Lines Detection using the respective checkbox.
Usual Comparison vs. Similar Lines Detection
The example below shows a typical case. The code was updated with two minor additions,
The usual comparison algorithm returns the following result:
The blocks are treated as different, despite their obvious similarity. Enabling
Similar Lines Detection allows drastically enhancing the comparison result. Code
Compare Pro treats the blocks as similar and highlights the minor difference. For
this example we used the Quick Mode of Similar Lines Detection.
Quick Mode vs. Common Mode
Sometimes, however, the Quick Mode can be insuffiecient for your purpose, which
is illustrated by the following example.
A new position has been added to the database and parameter has been renamed.
Relying on string length only, Similar Lines Detection feature associated the blocks
With the Quick Mode disabled, Code Compare Pro compares the contents of the blocks
and associates them correctly, highlighting the difference.
For details on the major feature set of our file diff and merge tool, refer to the
overview page of Code Compare.