Places in code with 6 or more lines that are exactly the same.
Intro
- For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
- Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
- You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 10% duplication:
- 8,176 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 894 duplicated lines
- 97 duplicates
Duplication per Extension
Duplication per Component (primary)
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 39 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 559:628 (9%)660:730 (7%) | view | |
| 35 | x 2 | pgo/cases/pgo01orgpgo/cases/wordpress | 20:77 (41%)20:77 (36%) | view | |
| 23 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 581:611 (1%)1057:1087 (2%) | view | |
| 22 | x 2 | pgo/cases/mediawikipgo/cases/symfony_demo | 5:38 (22%)5:38 (33%) | view | |
| 21 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 639:678 (4%)741:780 (4%) | view | |
| 15 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 761:782 (3%)942:963 (2%) | view | |
| 14 | x 2 | pgo/cases/symfony_demopgo/cases/symfony_demo_pdo_mysql | 66:89 (21%)86:109 (18%) | view | |
| 13 | x 2 | pgo/cases/joomlapgo/cases/wordpress | 52:68 (11%)62:79 (13%) | view | |
| 13 | x 2 | msys2/usr/share/bison/xsltmsys2/usr/share/bison/xslt | 214:232 (5%)365:383 (3%) | view | |
| 13 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 581:597 (<1%)523:539 (2%) | view | |
| 13 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 523:539 (2%)1057:1073 (1%) | view | |
| 12 | x 2 | pgo/cases/drupalpgo/cases/joomla | 84:107 (17%)132:155 (10%) | view | |
| 12 | x 2 | pgo/cases/joomlapgo/cases/pgo01org | 52:66 (10%)62:77 (14%) | view | |
| 12 | x 2 | pgo/cases/symfony_demo_pdo_mysqlpgo/cases/wordpress | 5:18 (15%)5:18 (12%) | view | |
| 11 | x 2 | pgo/cases/joomlapgo/cases/wordpress | 98:115 (9%)104:122 (11%) | view | |
| 11 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 370:386 (2%)471:487 (2%) | view | |
| 11 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 2127:2139 (<1%)1202:1214 (1%) | view | |
| 11 | x 2 | msys2/usr/share/bison/xsltmsys2/usr/share/bison/xslt | 384:396 (4%)486:498 (3%) | view | |
| 11 | x 2 | pgo/cases/pgo01orgpgo/cases/wordpress | 5:17 (13%)5:17 (11%) | view | |
| 11 | x 2 | pgo/cases/drupalpgo/cases/symfony_demo | 21:41 (15%)21:41 (16%) | view | |
| 11 | x 2 | pgo/cases/pgo01orgpgo/cases/symfony_demo_pdo_mysql | 5:17 (13%)5:17 (14%) | view | |
| 10 | x 2 | pgo/cases/drupalpgo/cases/symfony_demo | 5:16 (14%)5:16 (15%) | view | |
| 10 | x 2 | pgo/cases/joomlapgo/cases/mediawiki | 5:16 (8%)5:16 (10%) | view | |
| 10 | x 2 | pgo/cases/drupalpgo/cases/joomla | 5:16 (14%)5:16 (8%) | view | |
| 10 | x 2 | pgo/cases/joomlapgo/cases/symfony_demo | 5:16 (8%)5:16 (15%) | view | |
| 10 | x 2 | pgo/cases/drupalpgo/cases/mediawiki | 5:16 (14%)5:16 (10%) | view | |
| 10 | x 2 | pgo/cases/drupalpgo/cases/mediawiki | 21:38 (14%)21:38 (10%) | view | |
| 9 | x 2 | pgo/cases/symfony_demopgo/cases/wordpress | 5:15 (13%)5:15 (9%) | view | |
| 9 | x 2 | pgo/cases/drupalpgo/cases/symfony_demo_pdo_mysql | 5:15 (12%)5:15 (11%) | view | |
| 9 | x 2 | pgo/cases/drupalpgo/cases/pgo01org | 5:15 (12%)5:15 (10%) | view | |
| 9 | x 2 | pgo/cases/mediawikipgo/cases/wordpress | 5:15 (9%)5:15 (9%) | view | |
| 9 | x 2 | pgo/cases/mediawikipgo/cases/symfony_demo_pdo_mysql | 5:15 (9%)5:15 (11%) | view | |
| 9 | x 2 | lib/php/libsdk/SDK/Build/PGO/Serverlib/php/libsdk/SDK/Build/PGO/Server | 105:117 (11%)126:138 (11%) | view | |
| 9 | x 2 | pgo/cases/joomlapgo/cases/pgo01org | 5:15 (8%)5:15 (10%) | view | |
| 9 | x 2 | pgo/cases/pgo01orgpgo/cases/symfony_demo | 5:15 (10%)5:15 (13%) | view | |
| 9 | x 2 | pgo/cases/drupalpgo/cases/wordpress | 5:15 (12%)5:15 (9%) | view | |
| 9 | x 2 | msys2/usr/share/bison/xsltmsys2/usr/share/bison/xslt | 1:37 (3%)1:37 (2%) | view | |
| 9 | x 2 | pgo/cases/joomlapgo/cases/symfony_demo_pdo_mysql | 5:15 (8%)5:15 (11%) | view | |
| 9 | x 2 | pgo/cases/joomlapgo/cases/wordpress | 5:15 (8%)5:15 (9%) | view | |
| 9 | x 2 | pgo/cases/drupalpgo/cases/symfony_demo | 58:70 (12%)54:66 (13%) | view | |
| 9 | x 2 | pgo/cases/mediawikipgo/cases/pgo01org | 5:15 (9%)5:15 (10%) | view | |
| 9 | x 2 | pgo/cases/symfony_demopgo/cases/symfony_demo_pdo_mysql | 5:15 (13%)5:15 (11%) | view | |
| 8 | x 2 | msys2/usr/share/awkmsys2/usr/share/awk | 50:57 (10%)35:42 (13%) | view | |
| 8 | x 2 | pgo/cases/symfony_demopgo/cases/symfony_demo_pdo_mysql | 16:27 (12%)17:28 (10%) | view | |
| 8 | x 2 | msys2/usr/share/awkmsys2/usr/share/awk | 17:25 (10%)16:24 (13%) | view | |
| 8 | x 2 | pgo/cases/mediawikipgo/cases/symfony_demo_pdo_mysql | 16:27 (8%)17:28 (10%) | view | |
| 8 | x 2 | msys2/usr/share/bison/skeletonsmsys2/usr/share/bison/skeletons | 698:710 (1%)805:817 (1%) | view | |
| 8 | x 2 | lib/php/libsdk/SDK/Build/PGO/Serverlib/php/libsdk/SDK/Build/PGO/Server | 36:50 (10%)60:74 (10%) | view | |
| 7 | x 2 | lib/php/libsdk/SDK/Build/PGOlib/php/libsdk/SDK/Build/PGO | 166:175 (3%)183:192 (3%) | view | |
| 7 | x 2 | pgo/cases/joomlapgo/cases/wordpress | 18:28 (6%)18:28 (7%) | view |
Duplicated Units
The list of top 10 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 13 | x 2 | lib/php/libsdk/SDK/Build/PGO/Serverlib/php/libsdk/SDK/Build/PGO/Server | 103:122 124:142 | view | |
| 10 | x 2 | pgo/cases/pgo01orgpgo/cases/wordpress | 20:31 20:31 | view | |
| 9 | x 2 | lib/php/libsdk/SDKlib/php/libsdk/SDK | 392:403 405:416 | view | |
| 9 | x 3 | pgo/cases/drupalpgo/cases/mediawikipgo/cases/symfony_demo | 19:29 19:29 19:29 | view | |
| 7 | x 2 | lib/php/libsdk/SDK/Build/PGOlib/php/libsdk/SDK/Build/PGO | 98:107 109:118 | view | |
| 7 | x 2 | lib/php/libsdk/SDK/Build/PGOlib/php/libsdk/SDK/Build/PGO | 131:140 153:162 | view | |
| 7 | x 2 | lib/php/libsdk/SDK/Build/PGO/PHPlib/php/libsdk/SDK/Build/PGO/PHP | 45:54 31:40 | view | |
| 7 | x 2 | lib/php/libsdk/SDK/Build/PGO/Serverlib/php/libsdk/SDK/Build/PGO/Server | 36:46 60:70 | view | |
| 7 | x 2 | lib/php/libsdk/SDK/Build/PGO/Serverlib/php/libsdk/SDK/Build/PGO/Server | 104:112 114:122 | view | |
| 7 | x 6 | pgo/cases/drupalpgo/cases/mediawikipgo/cases/pgo01orgpgo/cases/symfony_demopgo/cases/symfony_demo_pdo_mysqlpgo/cases/wordpress | 113:122 149:158 134:143 104:113 125:134 146:155 | view |