Added more flexibility to the Decimal::fromString when receives exponential notation

Author: castarco

src/Decimal.php

@@ -193,7 +193,7 @@ public static function fromString($strValue, $scale = null)
                 $scale :
                 (isset($captures[4]) ? max(0, strlen($captures[4])-1) : 0);
 
-        } elseif (preg_match('/([+\-]?)([0-9](\.[0-9]+)?)[eE]([+\-]?)([1-9][0-9]*)/', $strValue, $captures) === 1) {
+        } elseif (preg_match('/([+\-]?)0*([0-9](\.[0-9]+)?)[eE]([+\-]?)([1-9][0-9]*)/', $strValue, $captures) === 1) {
 
             // Now it's time to "unroll" the exponential notation to basic positional notation
             $sign     = self::normalizeSign($captures[1]);

tests/Decimal/DecimalFromStringTest.php

@@ -23,7 +23,7 @@ public function testNegativeSimpleString()
         $this->assertEquals($n2->__toString(), '-1.0');
     }
 
-    public function testExponentialNotationString_With_PositiveExponent_And_PositiveSign()
+    public function testExponentialNotationString_With_PositiveExponent_And_Positive()
     {
         $this->assertTrue(
             Decimal::fromString('1e3')->equals(Decimal::fromInteger(1000))
@@ -45,7 +45,7 @@ public function testExponentialNotationString_With_PositiveExponent_And_Negative
         );
     }
 
-    public function testExponentialNotationString_With_NegativeExponent_And_PositiveSign()
+    public function testExponentialNotationString_With_NegativeExponent_And_Positive()
     {
         $this->assertTrue(
             Decimal::fromString('1e-3')->equals(Decimal::fromString('0.001'))
@@ -67,7 +67,7 @@ public function testExponentialNotationString_With_NegativeExponent_And_Negative
         );
     }
 
-    public function testSimpleNotation_With_Positive_Sign()
+    public function testSimpleNotation_With_PositiveSign()
     {
         $this->assertTrue(
             Decimal::fromString('+34')->equals(Decimal::fromString('34'))
@@ -78,6 +78,17 @@ public function testSimpleNotation_With_Positive_Sign()
         );
     }
 
+    public function testExponentialNotation_With_PositiveSign()
+    {
+        $this->assertTrue(
+            Decimal::fromString('+1e3')->equals(Decimal::fromString('1e3'))
+        );
+
+        $this->assertTrue(
+            Decimal::fromString('+0001e3')->equals(Decimal::fromString('1e3'))
+        );
+    }
+
     /**
      * @expectedException Litipk\Exceptions\InvalidArgumentTypeException
      * @expectedExceptionMessage $strVlue must be of type string.