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Lint - PHP & Javascript Code Checking
This document discusses various lint tools for PHP and JavaScript code checking. It describes how lint was originally developed at Bell Labs for C code checking and does static code analysis without execution. For PHP, the built-in php -l command and third party tools like PHPLint are presented. For JavaScript, JSLint is highlighted as a tool that detects obscure errors. The document notes that lint tools find technical errors but not logical errors.
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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 DougCrockford • 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 :: DaveRoss :: 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