bug #24460 [Form] fix parsing invalid floating point numbers (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
----------

[Form] fix parsing invalid floating point numbers

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #19854, #22586
| License       | MIT
| Doc PR        |

Should make AppVeyor builds pass again. Code borrowed from `NumberToLocalizedStringTransformer`.

Commits
-------

042eac4624 [Form] fix parsing invalid floating point numbers

src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php

@@ -116,6 +116,7 @@ class PercentToLocalizedStringTransformer implements DataTransformerInterface
             return;
         }
 
+        $position = 0;
         $formatter = $this->getNumberFormatter();
         $groupSep = $formatter->getSymbol(\NumberFormatter::GROUPING_SEPARATOR_SYMBOL);
         $decSep = $formatter->getSymbol(\NumberFormatter::DECIMAL_SEPARATOR_SYMBOL);
@@ -129,18 +130,44 @@ class PercentToLocalizedStringTransformer implements DataTransformerInterface
             $value = str_replace(',', $decSep, $value);
         }
 
+        if (false !== strpos($value, $decSep)) {
+            $type = \NumberFormatter::TYPE_DOUBLE;
+        } else {
+            $type = \PHP_INT_SIZE === 8 ? \NumberFormatter::TYPE_INT64 : \NumberFormatter::TYPE_INT32;
+        }
+
         // replace normal spaces so that the formatter can read them
-        $value = $formatter->parse(str_replace(' ', "\xc2\xa0", $value));
+        $result = $formatter->parse(str_replace(' ', "\xc2\xa0", $value), $type, $position);
 
         if (intl_is_failure($formatter->getErrorCode())) {
             throw new TransformationFailedException($formatter->getErrorMessage());
         }
 
         if (self::FRACTIONAL == $this->type) {
-            $value /= 100;
+            $result /= 100;
         }
 
-        return $value;
+        if (\function_exists('mb_detect_encoding') && false !== $encoding = mb_detect_encoding($value, null, true)) {
+            $length = mb_strlen($value, $encoding);
+            $remainder = mb_substr($value, $position, $length, $encoding);
+        } else {
+            $length = \strlen($value);
+            $remainder = substr($value, $position, $length);
+        }
+
+        // After parsing, position holds the index of the character where the
+        // parsing stopped
+        if ($position < $length) {
+            // Check if there are unrecognized characters at the end of the
+            // number (excluding whitespace characters)
+            $remainder = trim($remainder, " \t\n\r\0\x0b\xc2\xa0");
+
+            if ('' !== $remainder) {
+                throw new TransformationFailedException(sprintf('The number contains unrecognized characters: "%s"', $remainder));
+            }
+        }
+
+        return $result;
     }
 
     /**

src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/PercentToLocalizedStringTransformerTest.php

@@ -141,10 +141,10 @@ class PercentToLocalizedStringTransformerTest extends TestCase
      */
     public function testDecimalSeparatorMayNotBeDotIfGroupingSeparatorIsDot()
     {
-        // Since we test against "de_AT", we need the full implementation
+        // Since we test against "de_DE", we need the full implementation
         IntlTestHelper::requireFullIntl($this, '4.8.1.1');
 
-        \Locale::setDefault('de_AT');
+        \Locale::setDefault('de_DE');
 
         $transformer = new PercentToLocalizedStringTransformer(1, 'integer');
 
@@ -236,4 +236,70 @@ class PercentToLocalizedStringTransformerTest extends TestCase
         $this->assertEquals(1234.5, $transformer->reverseTransform('1234,5'));
         $this->assertEquals(1234.5, $transformer->reverseTransform('1234.5'));
     }
+
+    /**
+     * @expectedException \Symfony\Component\Form\Exception\TransformationFailedException
+     */
+    public function testReverseTransformDisallowsLeadingExtraCharacters()
+    {
+        $transformer = new PercentToLocalizedStringTransformer();
+
+        $transformer->reverseTransform('foo123');
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Form\Exception\TransformationFailedException
+     * @expectedExceptionMessage The number contains unrecognized characters: "foo3"
+     */
+    public function testReverseTransformDisallowsCenteredExtraCharacters()
+    {
+        $transformer = new PercentToLocalizedStringTransformer();
+
+        $transformer->reverseTransform('12foo3');
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Form\Exception\TransformationFailedException
+     * @expectedExceptionMessage The number contains unrecognized characters: "foo8"
+     * @requires extension mbstring
+     */
+    public function testReverseTransformDisallowsCenteredExtraCharactersMultibyte()
+    {
+        // Since we test against other locales, we need the full implementation
+        IntlTestHelper::requireFullIntl($this, false);
+
+        \Locale::setDefault('ru');
+
+        $transformer = new PercentToLocalizedStringTransformer();
+
+        $transformer->reverseTransform("12\xc2\xa0345,67foo8");
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Form\Exception\TransformationFailedException
+     * @expectedExceptionMessage The number contains unrecognized characters: "foo"
+     */
+    public function testReverseTransformDisallowsTrailingExtraCharacters()
+    {
+        $transformer = new PercentToLocalizedStringTransformer();
+
+        $transformer->reverseTransform('123foo');
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Form\Exception\TransformationFailedException
+     * @expectedExceptionMessage The number contains unrecognized characters: "foo"
+     * @requires extension mbstring
+     */
+    public function testReverseTransformDisallowsTrailingExtraCharactersMultibyte()
+    {
+        // Since we test against other locales, we need the full implementation
+        IntlTestHelper::requireFullIntl($this, false);
+
+        \Locale::setDefault('ru');
+
+        $transformer = new PercentToLocalizedStringTransformer();
+
+        $transformer->reverseTransform("12\xc2\xa0345,678foo");
+    }
 }