Copy/paste detector for source code on javascript

Jul 7, 2018Download as PPTX, PDF0 likes321 views

This document discusses jscpd, a copy/paste detector for JavaScript source code. It describes the reasons for its creation, its algorithm based on Rabin Karp string matching, and its architecture which uses parsers like Esprima to tokenize code into structured tokens. The tool supports various languages and outputs reports on copy/paste detections in JSON, XML, and other formats. Future plans include additional reporters, cross-project detections, and performance improvements.

Copy/Paste detector
for source code on
JavaScript
Andrey Kucherenko
Lead Software Engineer @ EPAM Systems (Kiev)

ABOUT
Andrey Kucherenko
Lead Software Engineer @ EPAM Systems (Kiev)
https://github.com/kucherenko/jscpd

ABOUT TOPIC
Copy/Paste detector for source code on
JavaScript
● Reasons
● Algorithm
● Architecture
● Tools
● Plans
https://github.com/kucherenko/jscpd

REASONS
https://github.com/kucherenko/jscpd

EXISTING TOOLS
https://github.com/kucherenko/jscpd
PHPCPD

ALGORITHM
Rabin Karp: String Matching
Algorithm
https://github.com/kucherenko/jscpd

ALGORIHTM
https://github.com/kucherenko/jscpd

ALGORIHTM
https://github.com/kucherenko/jscpd
const answer = 6 * 7;
const click = event => console.log(event)
function hello(name) {
console.log(`Hello ${name}`);
}

ALGORIHTM
https://github.com/kucherenko/jscpd
{ "type": "Keyword", "value": "const" },
{ "type": "Identifier", "value": "answer" },
{ "type": "Punctuator", "value": "=" },
{ "type": "Numeric", "value": "6" },
{ "type": "Punctuator", "value": "*" },
{ "type": "Numeric", "value": "7" },
{ "type": "Punctuator", "value": ";" },
{ "type": "Keyword", "value": "const" },
{ "type": "Identifier", "value": "click" },
{ "type": "Punctuator", "value": "=" },
{ "type": "Identifier", "value": "event" },
{ "type": "Punctuator", "value": "=>" },
{ "type": "Identifier", "value": "console" },
{ "type": "Punctuator", "value": "." },
{ "type": "Identifier", "value": "log" },
{ "type": "Punctuator", "value": "(" },
{ "type": "Identifier", "value": "event" },
{ "type": "Punctuator", "value": ")" },
{ "type": "Keyword", "value": "function" },
{ "type": "Identifier", "value": "hello" },
{ "type": "Punctuator", "value": "(" },
{ "type": "Identifier", "value": "name" },
{ "type": "Punctuator", "value": ")" },
{ "type": "Punctuator", "value": "{ " },
{ "type": "Identifier", "value": "console" },
{ "type": "Punctuator", "value": "." },
{ "type": "Identifier", "value": "log" },
{ "type": "Punctuator", "value": "(" },
{ "type": "Template", "value": "`Hello ${ " },
{ "type": "Identifier", "value": "name" },
{ "type": "Template", "value": " }`" },
{ "type": "Punctuator", "value": ")" },
{ "type": "Punctuator", "value": ";" },
{ "type": "Punctuator", "value": " }"

ALGORIHTM
https://github.com/kucherenko/jscpd
'3237124366', '07c4845853', '0b70d4ffe0', '7bb34abce5',
'59fb864552', '9f769a5e93', 'c913cc056b', '3237124366',
'4b09c07aa1', '0b70d4ffe0', '06b9bc0ef4', 'caf867a125',
'bd6845a7e7', '7fb7e4e540', '5fb26ad7b9', '66e5a4ee55',
'06b9bc0ef4', '3aa73104c6', '4a43a19740', 'bca573934e',
'66e5a4ee55', 'da5400f4e2', '3aa73104c6', 'fecd1071ce',
'bd6845a7e7', '7fb7e4e540', '5fb26ad7b9', '66e5a4ee55',
'4ab7ca70d5', 'da5400f4e2', '7c61a943f3', '3aa73104c6',
'c913cc056b', 'a120515c8c'

ARCHITECTURE
https://github.com/kucherenko/jscpd

TOKENS
https://github.com/kucherenko/jscpd
Esprima
acorn

TOKENS
https://github.com/kucherenko/jscpd

TOOLS
https://github.com/kucherenko/jscpd

SUPPORTED LANGUAGES
https://github.com/kucherenko/jscpd
JavaScript Go Swift
CoffeeScript Python Objective-C
TypeScript CSS/SASS Perl
Java C# Lua
C/C++ HTML Scala
PHP XML/XSLT Other…

FEATURES
● Reporters: json, xml, xslt, console
● Blame authors of copy/paste
● Use semantic of the languages (e.g. skip
comments)
● Community extensions: gulp-jscpd, html-
reporter, grunt-jscpd, etc.
https://github.com/kucherenko/jscpd

STATISTICS
https://github.com/kucherenko/jscpd

REPORTS
https://github.com/kucherenko/jscpd

PLANS
● More reporters
● Cross projects detections
● New API
● Improve performance (add cache, add
bloom filters, etc)
● Persistent store (NoSQL etc.)
● Reports for period
https://github.com/kucherenko/jscpd

QUESTIONS
Questions?
https://github.com/kucherenko/jscpd
Questions?
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Copy/paste detector for source code on javascript

1. Copy/Paste detector for source code on JavaScript Andrey Kucherenko Lead Software Engineer @ EPAM Systems (Kiev)

2. ABOUT Andrey Kucherenko Lead Software Engineer @ EPAM Systems (Kiev) https://github.com/kucherenko/jscpd

3. ABOUT TOPIC Copy/Paste detector for source code on JavaScript ● Reasons ● Algorithm ● Architecture ● Tools ● Plans https://github.com/kucherenko/jscpd

4. REASONS https://github.com/kucherenko/jscpd

5. EXISTING TOOLS https://github.com/kucherenko/jscpd PHPCPD

6. ALGORITHM Rabin Karp: String Matching Algorithm https://github.com/kucherenko/jscpd

7. ALGORIHTM https://github.com/kucherenko/jscpd

8. ALGORIHTM https://github.com/kucherenko/jscpd const answer = 6 * 7; const click = event => console.log(event) function hello(name) { console.log(`Hello ${name}`); }

9. ALGORIHTM https://github.com/kucherenko/jscpd { "type": "Keyword", "value": "const" }, { "type": "Identifier", "value": "answer" }, { "type": "Punctuator", "value": "=" }, { "type": "Numeric", "value": "6" }, { "type": "Punctuator", "value": "*" }, { "type": "Numeric", "value": "7" }, { "type": "Punctuator", "value": ";" }, { "type": "Keyword", "value": "const" }, { "type": "Identifier", "value": "click" }, { "type": "Punctuator", "value": "=" }, { "type": "Identifier", "value": "event" }, { "type": "Punctuator", "value": "=>" }, { "type": "Identifier", "value": "console" }, { "type": "Punctuator", "value": "." }, { "type": "Identifier", "value": "log" }, { "type": "Punctuator", "value": "(" }, { "type": "Identifier", "value": "event" }, { "type": "Punctuator", "value": ")" }, { "type": "Keyword", "value": "function" }, { "type": "Identifier", "value": "hello" }, { "type": "Punctuator", "value": "(" }, { "type": "Identifier", "value": "name" }, { "type": "Punctuator", "value": ")" }, { "type": "Punctuator", "value": "{ " }, { "type": "Identifier", "value": "console" }, { "type": "Punctuator", "value": "." }, { "type": "Identifier", "value": "log" }, { "type": "Punctuator", "value": "(" }, { "type": "Template", "value": "`Hello ${ " }, { "type": "Identifier", "value": "name" }, { "type": "Template", "value": " }`" }, { "type": "Punctuator", "value": ")" }, { "type": "Punctuator", "value": ";" }, { "type": "Punctuator", "value": " }"

10. ALGORIHTM https://github.com/kucherenko/jscpd '3237124366', '07c4845853', '0b70d4ffe0', '7bb34abce5', '59fb864552', '9f769a5e93', 'c913cc056b', '3237124366', '4b09c07aa1', '0b70d4ffe0', '06b9bc0ef4', 'caf867a125', 'bd6845a7e7', '7fb7e4e540', '5fb26ad7b9', '66e5a4ee55', '06b9bc0ef4', '3aa73104c6', '4a43a19740', 'bca573934e', '66e5a4ee55', 'da5400f4e2', '3aa73104c6', 'fecd1071ce', 'bd6845a7e7', '7fb7e4e540', '5fb26ad7b9', '66e5a4ee55', '4ab7ca70d5', 'da5400f4e2', '7c61a943f3', '3aa73104c6', 'c913cc056b', 'a120515c8c'

11. ARCHITECTURE https://github.com/kucherenko/jscpd

12. TOKENS https://github.com/kucherenko/jscpd Esprima acorn

13. TOKENS https://github.com/kucherenko/jscpd

14. TOOLS https://github.com/kucherenko/jscpd

15. SUPPORTED LANGUAGES https://github.com/kucherenko/jscpd JavaScript Go Swift CoffeeScript Python Objective-C TypeScript CSS/SASS Perl Java C# Lua C/C++ HTML Scala PHP XML/XSLT Other…

16. FEATURES ● Reporters: json, xml, xslt, console ● Blame authors of copy/paste ● Use semantic of the languages (e.g. skip comments) ● Community extensions: gulp-jscpd, html- reporter, grunt-jscpd, etc. https://github.com/kucherenko/jscpd

17. STATISTICS https://github.com/kucherenko/jscpd

18. REPORTS https://github.com/kucherenko/jscpd

19. REPORTS https://github.com/kucherenko/jscpd

20. REPORTS https://github.com/kucherenko/jscpd

21. PLANS ● More reporters ● Cross projects detections ● New API ● Improve performance (add cache, add bloom filters, etc) ● Persistent store (NoSQL etc.) ● Reports for period https://github.com/kucherenko/jscpd

22. QUESTIONS Questions? https://github.com/kucherenko/jscpd Questions? Questions?

Copy/paste detector for source code on javascript

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