[Form] add guess pattern

CHANGELOG-2.1.md

@@ -277,6 +277,7 @@ To get the diff between two versions, go to https://github.com/symfony/symfony/c
  * [BC BREAK] renamed "field_*" theme blocks to "form_*" and "field_widget" to
    "input"
  * ValidatorTypeGuesser now guesses "collection" for array type constraint
+ * added method `guessPattern` to FormTypeGuesserInterface to guess which pattern to use in the HTML5 attribute "pattern"
 
 ### HttpFoundation
 

src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php

@@ -115,7 +115,7 @@ public function guessMaxLength($class, $property)
     /**
      * {@inheritDoc}
      */
-    public function guessMinLength($class, $property)
+    public function guessPattern($class, $property)
     {
         $ret = $this->getMetadata($class);
         if ($ret && $ret[0]->hasField($property) && !$ret[0]->hasAssociation($property)) {

src/Symfony/Bridge/Propel1/Form/PropelTypeGuesser.php

@@ -124,7 +124,7 @@ public function guessMaxLength($class, $property)
     /**
      * {@inheritDoc}
      */
-    public function guessMinLength($class, $property)
+    public function guessPattern($class, $property)
     {
         if ($column = $this->getColumn($class, $property)) {
             switch ($column->getType()) {

src/Symfony/Bridge/Propel1/Tests/Form/PropelTypeGuesserTest.php

@@ -46,14 +46,14 @@ public function testGuessMaxLengthWithFloat()
 
     public function testGuessMinLengthWithText()
     {
-        $value = $this->guesser->guessMinLength(self::CLASS_NAME, 'value');
+        $value = $this->guesser->guessPattern(self::CLASS_NAME, 'value');
 
         $this->assertNull($value);
     }
 
     public function testGuessMinLengthWithFloat()
     {
-        $value = $this->guesser->guessMinLength(self::CLASS_NAME, 'price');
+        $value = $this->guesser->guessPattern(self::CLASS_NAME, 'price');
 
         $this->assertNotNull($value);
         $this->assertNull($value->getValue());

src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php

@@ -68,12 +68,12 @@ public function guessMaxLength($class, $property)
     /**
      * {@inheritDoc}
      */
-    public function guessMinLength($class, $property)
+    public function guessPattern($class, $property)
     {
         $guesser = $this;
 
         return $this->guess($class, $property, function (Constraint $constraint) use ($guesser) {
-            return $guesser->guessMinLengthForConstraint($constraint);
+            return $guesser->guessPatternForConstraint($constraint);
         });
     }
 
@@ -205,32 +205,35 @@ public function guessMaxLengthForConstraint(Constraint $constraint)
     }
 
     /**
-     * Guesses a field's minimum length based on the given constraint
-     *
+     * Guesses a field's pattern based on the given constraint
+     * 
      * @param  Constraint $constraint  The constraint to guess for
      *
-     * @return Guess       The guess for the minimum length
+     * @return Guess The guess for the pattern
      */
-    public function guessMinLengthForConstraint(Constraint $constraint)
+    public function guessPatternForConstraint(Constraint $constraint)
     {
         switch (get_class($constraint)) {
             case 'Symfony\Component\Validator\Constraints\MinLength':
-                return new ValueGuess($constraint->limit, Guess::HIGH_CONFIDENCE);
+                return new ValueGuess(sprintf('.{%s,}', (string) $constraint->limit), Guess::LOW_CONFIDENCE);
 
             case 'Symfony\Component\Validator\Constraints\SizeLength':
-                return new ValueGuess($constraint->min, Guess::HIGH_CONFIDENCE);
+                return new ValueGuess(sprintf('.{%s,%s}', (string) $constraint->min, (string) $constraint->max), Guess::LOW_CONFIDENCE);
+
+            case 'Symfony\Component\Validator\Constraints\Regex':
+                return new ValueGuess($constraint->pattern, Guess::HIGH_CONFIDENCE );
+
+            case 'Symfony\Component\Validator\Constraints\Min':
+                return new ValueGuess(sprintf('.{%s,}', strlen((string) $constraint->limit)), Guess::LOW_CONFIDENCE);
 
+            case 'Symfony\Component\Validator\Constraints\Size':
+                return new ValueGuess(sprintf('.{%s,%s}', strlen((string) $constraint->min), strlen((string) $constraint->max)), Guess::LOW_CONFIDENCE);
+
             case 'Symfony\Component\Validator\Constraints\Type':
                 if (in_array($constraint->type, array('double', 'float', 'numeric', 'real'))) {
                     return new ValueGuess(null, Guess::MEDIUM_CONFIDENCE);
                 }
                 break;
-
-            case 'Symfony\Component\Validator\Constraints\Min':
-                return new ValueGuess(strlen((string) $constraint->limit), Guess::LOW_CONFIDENCE);
-
-            case 'Symfony\Component\Validator\Constraints\Size':
-                return new ValueGuess(strlen((string) $constraint->min), Guess::LOW_CONFIDENCE);
         }
     }
 

src/Symfony/Component/Form/FormFactory.php

@@ -306,7 +306,7 @@ public function createNamedBuilder($type, $name, $data = null, array $options =
     /**
      * Returns a form builder for a property of a class.
      *
-     * If any of the 'max_length', 'required' and type options can be guessed,
+     * If any of the 'max_length', 'required', 'pattern' and type options can be guessed,
      * and are not provided in the options argument, the guessed value is used.
      *
      * @param string       $class     The fully qualified class name
@@ -327,27 +327,26 @@ public function createBuilderForProperty($class, $property, $data = null, array
 
         $typeGuess = $this->guesser->guessType($class, $property);
         $maxLengthGuess = $this->guesser->guessMaxLength($class, $property);
-        $minLengthGuess = $this->guesser->guessMinLength($class, $property);
         $requiredGuess = $this->guesser->guessRequired($class, $property);
+        $patternGuess = $this->guesser->guessPattern($class, $property);
 
         $type = $typeGuess ? $typeGuess->getType() : 'text';
 
         $maxLength = $maxLengthGuess ? $maxLengthGuess->getValue() : null;
-        $minLength = $minLengthGuess ? $minLengthGuess->getValue() : null;
-        $minLength = $minLength ?: 0;
+        $pattern   = $patternGuess ? $patternGuess->getValue() : null;
 
         if (null !== $maxLength) {
             $options = array_merge(array('max_length' => $maxLength), $options);
         }
 
-        if ($minLength > 0) {
-            $options = array_merge(array('pattern' => '.{'.$minLength.','.$maxLength.'}'), $options);
-        }
-
         if ($requiredGuess) {
             $options = array_merge(array('required' => $requiredGuess->getValue()), $options);
         }
 
+        if (null !== $pattern) {
+            $options = array_merge(array('pattern' => $pattern), $options);
+        }
+
         // user options may override guessed options
         if ($typeGuess) {
             $options = array_merge($typeGuess->getOptions(), $options);

src/Symfony/Component/Form/FormTypeGuesserChain.php

@@ -40,31 +40,43 @@ public function __construct(array $guessers)
         }
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function guessType($class, $property)
     {
         return $this->guess(function ($guesser) use ($class, $property) {
             return $guesser->guessType($class, $property);
         });
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function guessRequired($class, $property)
     {
         return $this->guess(function ($guesser) use ($class, $property) {
             return $guesser->guessRequired($class, $property);
         });
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function guessMaxLength($class, $property)
     {
         return $this->guess(function ($guesser) use ($class, $property) {
             return $guesser->guessMaxLength($class, $property);
         });
     }
 
-    public function guessMinLength($class, $property)
+    /**
+     * {@inheritDoc}
+     */
+    public function guessPattern($class, $property)
     {
         return $this->guess(function ($guesser) use ($class, $property) {
-            return $guesser->guessMinLength($class, $property);
+            return $guesser->guessPattern($class, $property);
         });
     }
 

src/Symfony/Component/Form/FormTypeGuesserInterface.php

@@ -44,13 +44,18 @@ function guessRequired($class, $property);
     function guessMaxLength($class, $property);
 
     /**
-     * Returns a guess about the field's minimum length
+     * Returns a guess about the field's pattern
+     * 
+     * - When you have a min value, you guess a min length of this min (LOW_CONFIDENCE) , lines below
+     * - If this value is a float type, this is wrong so you guess null with MEDIUM_CONFIDENCE to override the previous guess.
+     * Example:
+     *  You want a float greater than 5, 4.512313 is not valid but length(4.512314) > length(5)
+     * @link https://github.com/symfony/symfony/pull/3927
      *
      * @param  string $class      The fully qualified class name
      * @param  string $property   The name of the property to guess for
      *
-     * @return Guess  A guess for the field's minimum length
+     * @return Guess  A guess for the field's required pattern
      */
-    function guessMinLength($class, $property);
-
+    function guessPattern($class, $property);
 }

src/Symfony/Component/Form/Tests/FormFactoryTest.php

@@ -491,6 +491,39 @@ public function testCreateBuilderUsesRequiredSettingWithHighestConfidence()
         $this->assertEquals('builderInstance', $builder);
     }
 
+    public function testCreateBuilderUsesPatternIfFound()
+    {
+        $this->guesser1->expects($this->once())
+                ->method('guessPattern')
+                ->with('Application\Author', 'firstName')
+                ->will($this->returnValue(new ValueGuess(
+                    '/[a-z]/',
+                    Guess::MEDIUM_CONFIDENCE
+                )));
+
+        $this->guesser2->expects($this->once())
+                ->method('guessPattern')
+                ->with('Application\Author', 'firstName')
+                ->will($this->returnValue(new ValueGuess(
+                    '/[a-zA-Z]/',
+                    Guess::HIGH_CONFIDENCE
+                )));
+
+        $factory = $this->createMockFactory(array('createNamedBuilder'));
+
+        $factory->expects($this->once())
+            ->method('createNamedBuilder')
+            ->with('text', 'firstName', null, array('pattern' => '/[a-zA-Z]/'))
+            ->will($this->returnValue('builderInstance'));
+
+        $builder = $factory->createBuilderForProperty(
+            'Application\Author',
+            'firstName'
+        );
+
+        $this->assertEquals('builderInstance', $builder);
+    }
+
     public function testCreateNamedBuilderFromParentBuilder()
     {
         $type = new FooType();
@@ -541,18 +574,18 @@ public function testUnknownOption()
         $factory->createNamedBuilder($type, "text", "value", array("unknown" => "opt"));
     }
 
-    public function testFormTypeCreatesDefaultValueForEmptyDataOption()
-    {
-        $factory = new FormFactory(array(new \Symfony\Component\Form\Extension\Core\CoreExtension()));
-
-        $form = $factory->createNamedBuilder(new AuthorType(), 'author')->getForm();
-        $form->bind(array('firstName' => 'John', 'lastName' => 'Smith'));
-
-        $author = new Author();
-        $author->firstName = 'John';
-        $author->setLastName('Smith');
-
-        $this->assertEquals($author, $form->getData());
+    public function testFieldTypeCreatesDefaultValueForEmptyDataOption()
+    {
+        $factory = new FormFactory(array(new \Symfony\Component\Form\Extension\Core\CoreExtension()));
+
+        $form = $factory->createNamedBuilder(new AuthorType(), 'author')->getForm();
+        $form->bind(array('firstName' => 'John', 'lastName' => 'Smith'));
+
+        $author = new Author();
+        $author->firstName = 'John';
+        $author->setLastName('Smith');
+
+        $this->assertEquals($author, $form->getData());
     }
 
     private function createMockFactory(array $methods = array())