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Statische Analyse

 von PHP Projekten
Übersicht Themen

             Was wird analysiert?
             Vorteile von Analysewerkzeuge
             Vorstellung Analysewerkzeuge
             Analyseergebnisse auswerten




26.11.2010                      Gjero Krsteski   2
Was wird analysiert?

             Zusammensetzung verschiedener
             Softwarebestandteile
             Code Duplikate
             Zyklometrische Komplexität
             Potentielle Fehler




26.11.2010                     Gjero Krsteski   3
Vorteile von Analysewerkzeuge

             verarbeiten große Menge an Quelltext innerhalb
             kürzester Zeit
             kostengünstig, da beliebige Wiederholung möglich
             verbrauchen wenig Ressourcen

      Wichtig
       Bewertung ist immer objektiv!
       Subjektive oder persönliche Faktoren spielen keine
       Rolle!


26.11.2010                       Gjero Krsteski                 4
PEAR - phploc

             Anzahl an Zeilen PHP Code
             Unterscheidet Kommentaren von richtigem Code
             Anzahl Interfaces
             Anzahl Klassen
             Anzahl nichtstatische- und statische Methoden
             Anzahl Funktionen
             Zyklometrische Komplexität




26.11.2010                      Gjero Krsteski               5
PEAR - phpcpd

             Copy & Paste Detector für PHP Code
             duplizierter Code
               ist schwer zu warten
               verletzt das OOP Paradigma




26.11.2010                         Gjero Krsteski   6
Custom line-counter

             angepasstes UNIX-Kommando
             Anzahl Zeilen einer PHP-Datei

      Was haben wir davon?
       Klassen aufzuspüren die sich deutlich von den
       anderen Klassen unterscheiden
       Verdacht =
               weiß zu viel oder beschäftigt sich mit zu vielen Dingen
               doppelten Code
               schlecht testbar

26.11.2010                           Gjero Krsteski                      7
PEAR - pdepend

             Analysiert die OOP Architektur

      Ausgewogenheit = Instabilität + Abstraktion

             Instabil = Wert bei 1, eingehende Abhängigkeit.
             Stabil = Wert bei 0, ausgehende Abhängigkeit.
             Abstraktion > 0 = konkrete Methoden und Klassen.
             Abstraktion > 1 = abstrakte Methoden und Klassen.



26.11.2010                       Gjero Krsteski                  8
Danke für die Aufmerksamkeit!
Gjero Krsteski
Web-Programmierer, Berater, Trainer
       Datum: 26.11.2010
     Homepage: krsteski.de
    E-Mail: gjero@krsteski.de

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Statische Analyse von PHP Projekten

  • 1. Statische Analyse von PHP Projekten
  • 2. Übersicht Themen Was wird analysiert? Vorteile von Analysewerkzeuge Vorstellung Analysewerkzeuge Analyseergebnisse auswerten 26.11.2010 Gjero Krsteski 2
  • 3. Was wird analysiert? Zusammensetzung verschiedener Softwarebestandteile Code Duplikate Zyklometrische Komplexität Potentielle Fehler 26.11.2010 Gjero Krsteski 3
  • 4. Vorteile von Analysewerkzeuge verarbeiten große Menge an Quelltext innerhalb kürzester Zeit kostengünstig, da beliebige Wiederholung möglich verbrauchen wenig Ressourcen Wichtig Bewertung ist immer objektiv! Subjektive oder persönliche Faktoren spielen keine Rolle! 26.11.2010 Gjero Krsteski 4
  • 5. PEAR - phploc Anzahl an Zeilen PHP Code Unterscheidet Kommentaren von richtigem Code Anzahl Interfaces Anzahl Klassen Anzahl nichtstatische- und statische Methoden Anzahl Funktionen Zyklometrische Komplexität 26.11.2010 Gjero Krsteski 5
  • 6. PEAR - phpcpd Copy & Paste Detector für PHP Code duplizierter Code ist schwer zu warten verletzt das OOP Paradigma 26.11.2010 Gjero Krsteski 6
  • 7. Custom line-counter angepasstes UNIX-Kommando Anzahl Zeilen einer PHP-Datei Was haben wir davon? Klassen aufzuspüren die sich deutlich von den anderen Klassen unterscheiden Verdacht = weiß zu viel oder beschäftigt sich mit zu vielen Dingen doppelten Code schlecht testbar 26.11.2010 Gjero Krsteski 7
  • 8. PEAR - pdepend Analysiert die OOP Architektur Ausgewogenheit = Instabilität + Abstraktion Instabil = Wert bei 1, eingehende Abhängigkeit. Stabil = Wert bei 0, ausgehende Abhängigkeit. Abstraktion > 0 = konkrete Methoden und Klassen. Abstraktion > 1 = abstrakte Methoden und Klassen. 26.11.2010 Gjero Krsteski 8
  • 9. Danke für die Aufmerksamkeit!
  • 10. Gjero Krsteski Web-Programmierer, Berater, Trainer Datum: 26.11.2010 Homepage: krsteski.de E-Mail: gjero@krsteski.de