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#phpday Dica trentatrè <?php echo ’33’ ?> Controllare lo stato di salute di una applicazione con le metriche del codice Michele Orselli (@_orso_)

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#phpday Code Metrics

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Measure of some property of a piece#phpday of software (Wikipedia)

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#phpday Who Cares?

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#phpday How long will it take to add feature X?

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#phpday Internal vs External Quality

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Code Metrics as a mean to expose#phpday internal quality

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#phpday How long will it take to add feature X?

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#phpday Classic

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Lines and Numbers Lines LOC: Lines Of Code#phpday ELOC: Executable LOC CLOC: Comment LOC NCLOC: Non-Comment LOC Numbers NOC: Number Of Classes NOM: Number Of Methods NOP: Number Of Packages

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 5 abstract class shape { 6 /* Returns the area of the shape */#phpday 7 abstract function area(); 8 } 9 10 class circle extends shape { 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } 16 17 class triangle extends shape { 18 19 public function area() {} 20 } 21 22 ?>

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 LOC 22 5 abstract class shape { 6 /* Returns the area of the shape */#phpday 7 abstract function area(); 8 } 9 10 class circle extends shape { 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } 16 17 class triangle extends shape { 18 19 public function area() {} 20 } 21 22 ?>

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 LOC 22 5 abstract class shape { 6 /* Returns the area of the shape */#phpday CLOC 2 7 abstract function area(); 8 } 9 10 class circle extends shape { 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } 16 17 class triangle extends shape { 18 19 public function area() {} 20 } 21 22 ?>

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 LOC 22 5 abstract class shape { 6 /* Returns the area of the shape */#phpday CLOC 2 7 abstract function area(); 8 } NCLOC 20 9 10 class circle extends shape { 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } 16 17 class triangle extends shape { 18 19 public function area() {} 20 } 21 22 ?>

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 LOC 22 5 abstract class shape { 6 /* Returns the area of the shape */#phpday CLOC 2 7 abstract function area(); 8 } NCLOC 20 9 10 class circle extends shape { ELOC 3 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } 16 17 class triangle extends shape { 18 19 public function area() {} 20 } 21 22 ?>

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 LOC 22 5 abstract class shape { 6 /* Returns the area of the shape */#phpday CLOC 2 7 abstract function area(); 8 } NCLOC 20 9 10 class circle extends shape { ELOC 3 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } NOP 1 16 17 class triangle extends shape { 18 19 public function area() {} 20 } 21 22 ?>

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 LOC 22 5 abstract class shape { 6 /* Returns the area of the shape */#phpday CLOC 2 7 abstract function area(); 8 } NCLOC 20 9 10 class circle extends shape { ELOC 3 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } NOP 1 16 17 class triangle extends shape { NOC 3 18 19 public function area() {} 20 } 21 22 ?>

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Lines and Numbers 1 <?php 2 Lines 3 namespace shapestwodimensional; 4 LOC 22 5 abstract class shape { 6 /* Returns the area of the shape */#phpday CLOC 2 7 abstract function area(); 8 } NCLOC 20 9 10 class circle extends shape { ELOC 3 11 public function area() {} 12 13 /* Ret the diameter of the circle */ Numbers 14 public function diameter() {} 15 } NOP 1 16 17 class triangle extends shape { NOC 3 18 19 public function area() {} NOM 4 20 } 21 22 ?>

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#phpday phploc http://sebastianbergmann.github.com/phploc/

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#phpday

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#phpday Complexity

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Complexity#phpday Control Structures Complexity if, elseif, for, while, foreach, catch, case, xor, and, or, &&, ||, ?: Ciclomatic Complexity (CCN) NPath Complexity

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Ciclomatic Complexity 1 <?php 2 # decision points 3 class polygon { 4 5 public function perimeter() 6 {#phpday CCN 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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Ciclomatic Complexity 1 <?php 2 # decision points 3 class polygon { 4 5 public function perimeter() 6 {#phpday CCN 1 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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Ciclomatic Complexity 1 <?php 2 # decision points 3 class polygon { 4 5 public function perimeter() 6 {#phpday CCN 2 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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Ciclomatic Complexity 1 <?php 2 # decision points 3 class polygon { 4 5 public function perimeter() 6 {#phpday CCN 3 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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Ciclomatic Complexity 1 <?php 2 # decision points 3 class polygon { 4 5 public function perimeter() 6 {#phpday CCN 4 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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CCN Range Values#phpday 1 - 4: low 5-7: medium 8-10: high 11+: wtf

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NPath Complexity 1 <?php 2 # acyclic paths 3 class polygon { 4 5 public function perimeter() 6 {#phpday NPath 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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NPath Complexity 1 <?php 2 # acyclic paths 3 class polygon { 4 5 public function perimeter() 6 {#phpday NPath 1 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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NPath Complexity 1 <?php 2 # acyclic paths 3 class polygon { 4 5 public function perimeter() 6 {#phpday NPath 2 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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NPath Complexity 1 <?php 2 # acyclic paths 3 class polygon { 4 5 public function perimeter() 6 {#phpday NPath 3 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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NPath Complexity 1 <?php 2 # acyclic paths 3 class polygon { 4 5 public function perimeter() 6 {#phpday NPath 4 7 if (!is_array($this->vertices)) { 8 return false; 9 } 10 11 $perimeter = 0; 12 13 foreach ($this->vertices as $vertex) { 14 $perimenter += $vertex; 15 } 16 17 return $perimeter; 18 } 19 } 20 ?>

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NPath Treshold#phpday Critical if > 200

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#phpday PHP Depend http://pdepend.org

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#phpday

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Overview Pyramid#phpday

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#phpday OO Metrics

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Afferent/Efferent Coupling#phpday Ca: no. of unique incoming dependencies Ce: no. of unique outgoing dependencies

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Afferent/Efferent Coupling Shape area()#phpday Circle Triangle area() area() Math PI

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Afferent/Efferent Coupling Shape area()#phpday Circle Triangle area() area() Math Ca: 1 PI Ce: 0

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Afferent/Efferent Coupling Shape area()#phpday Ca: 0 Circle Triangle Ce: 2 area() area() Math Ca: 1 PI Ce: 0

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Afferent/Efferent Coupling Shape Ca: 2 area() Ce: 0#phpday Ca: 1 Circle Triangle Ce: 1 area() area() Math Ca: 1 PI Ce: 0

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Afferent/Efferent Coupling Shape Ca: 2 area() Ce: 0#phpday Ca: 1 Circle Triangle Ca: 0 Ce: 1 area() area() Ce: 1 Math Ca: 1 PI Ce: 0

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#phpday $ pdepend --jdepend-chart=j.png .

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Instability Chart#phpday A = AC / (CC + AC) D = | A + I | -1 I = Ce / (Ce + Ca)

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#phpday PHP MD http://phpmd.org

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PHP MD#phpday Code Size Rules Design Rules Naming Rules Unused Code Rules

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#phpday $ phpmd src/ xml codesize,design,naming,unusedcode -- reportfile pmd.xml

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#phpday

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#phpday Non Static Analysis

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C.R.A.P Change Risk Analysis Predictions or#phpday “Your code is crap” CRAP = CCN^2 * (1 – COV/100)^3 + CCN

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#phpday Putting it all together

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#phpday PHP_CodeBrowser https://github.com/mayflowergmbh/PHP_CodeBrowser.git

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$ phpcb --log logs --source src --output#phpday code-browser

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#phpday PHP Project Wizard https://github.com/sebastianbergmann/php-project-wizard.git

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Code Metrics as a mean to expose#phpday internal quality

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Further Reading http://manuel-pichler.de/#phpday http://pdepend.org http://phpmd.org http://www.artima.com/weblogs/viewpost.jsp?thread=215899

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Questions? @_orso_#phpday mo@ideato.it http://joind.in/2989