Lint - PHP & Javascript Code Checking

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Dave Ross

Technologie

History of Lint

• Bell Labs, Late 1970s
• First public appearance Unix V7 (1979)
• Written for C language
• Named for bits of crud in sheeps’ wool

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

Static Code Analysis

• Analyzes code without executing it
• Detects syntax errors (missing semicolons,
missing curly braces)
• Detects some bugs & unsafe code

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

PHP -l

• PHP’s built-in Lint tool
• Command-line tool
• php -l someﬁle.php
• Same code PHP uses to parse code at
runtime

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

PHPLint
• http://www.icosaedro.it/phplint/
• Windows & Unix

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

PHPLint On-Line

• http://www.icosaedro.it/phplint/phplint-on-line.html

• Only checks one ﬁle at a time
• Can’t check dependencies

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

PHPLint On-Line

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

JSLint by Doug Crockford
• JavaScript Lint tool
• jslint.com
• “Warning: JSLint will hurt your feelings”
• Detects really obscure JavaScript errors
• See “JavaScript: The Good Parts”
http://www.youtube.com/watch?
v=hQVTIJBZook

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

Not Psychic

• Lint tools wont ﬁnd every error
• They’ll ﬁnd technical errors
• You’re on your own for logical errors

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

Any Questions?

Dave Ross
PHP & Javascript developer
WordPress plugin developer
http://daveross.tel
http://davidmichaelross.com

Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

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Lint - PHP & Javascript Code Checking

1. LINT PHP & JavaScript Code Checkers Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

2. History of Lint • Bell Labs, Late 1970s • First public appearance Unix V7 (1979) • Written for C language • Named for bits of crud in sheeps’ wool Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

3. Static Code Analysis • Analyzes code without executing it • Detects syntax errors (missing semicolons, missing curly braces) • Detects some bugs & unsafe code Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

4. PHP -l • PHP’s built-in Lint tool • Command-line tool • php -l someﬁle.php • Same code PHP uses to parse code at runtime Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

5. PHPLint • http://www.icosaedro.it/phplint/ • Windows & Unix Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

6. PHPLint On-Line • http://www.icosaedro.it/phplint/phplint-on-line.html • Only checks one ﬁle at a time • Can’t check dependencies Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

7. PHPLint On-Line Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

8. JSLint by Doug Crockford • JavaScript Lint tool • jslint.com • “Warning: JSLint will hurt your feelings” • Detects really obscure JavaScript errors • See “JavaScript: The Good Parts” http://www.youtube.com/watch? v=hQVTIJBZook Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

9. Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

10. Not Psychic • Lint tools wont ﬁnd every error • They’ll ﬁnd technical errors • You’re on your own for logical errors Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

11. Any Questions? Dave Ross PHP & Javascript developer WordPress plugin developer http://daveross.tel http://davidmichaelross.com Lint :: Dave Ross :: Suburban Chicago PHP & Web Design Meetup :: suburbanchicagophp.org :: Sept 3, 2009

Lint - PHP & Javascript Code Checking

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