Improve performances for __toString() methods.

src/Duration.php

@@ -13,9 +13,9 @@
 use function is_int;
 use function preg_match;
 use function rtrim;
-use function sprintf;
 use function str_pad;
 
+use const STR_PAD_LEFT;
 use const STR_PAD_RIGHT;
 
 /**
@@ -808,7 +808,7 @@ public function toISOString(): string
         $string .= (($seconds === 0 && $negative) ? '-0' : $seconds);
 
         if ($nanos !== 0) {
-            $string .= '.' . rtrim(sprintf('%09d', $nanos), '0');
+            $string .= '.' . rtrim(str_pad((string) $nanos, 9, '0', STR_PAD_LEFT), '0');
         }
 
         return $string . 'S';

src/LocalDate.php

@@ -16,7 +16,9 @@
 
 use function intdiv;
 use function min;
-use function sprintf;
+use function str_pad;
+
+use const STR_PAD_LEFT;
 
 /**
  * A date without a time-zone in the ISO-8601 calendar system, such as `2007-12-03`.
@@ -759,9 +761,19 @@ public function jsonSerialize(): string
      */
     public function toISOString(): string
     {
-        $pattern = ($this->year < 0 ? '%05d' : '%04d') . '-%02d-%02d';
-
-        return sprintf($pattern, $this->year, $this->month, $this->day);
+        // This code is optimized for high performance
+        return ($this->year < 1000 && $this->year > -1000
+                ? (
+                    $this->year < 0
+                        ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
+                        : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
+                )
+                : $this->year
+            )
+            . '-'
+            . ($this->month < 10 ? '0' . $this->month : $this->month)
+            . '-'
+            . ($this->day < 10 ? '0' . $this->day : $this->day);
     }
 
     /**

src/LocalTime.php

@@ -19,9 +19,10 @@
 
 use function intdiv;
 use function rtrim;
-use function sprintf;
 use function str_pad;
 
+use const STR_PAD_LEFT;
+
 /**
  * A time without a time-zone in the ISO-8601 calendar system, such as 10:15:30.
  *
@@ -662,17 +663,12 @@ public function jsonSerialize(): string
      */
     public function toISOString(): string
     {
-        if ($this->nano === 0) {
-            if ($this->second === 0) {
-                return sprintf('%02u:%02u', $this->hour, $this->minute);
-            } else {
-                return sprintf('%02u:%02u:%02u', $this->hour, $this->minute, $this->second);
-            }
-        }
-
-        $nanos = rtrim(sprintf('%09u', $this->nano), '0');
-
-        return sprintf('%02u:%02u:%02u.%s', $this->hour, $this->minute, $this->second, $nanos);
+        // This code is optimized for high performance
+        return ($this->hour < 10 ? '0' . $this->hour : $this->hour)
+            . ':'
+            . ($this->minute < 10 ? '0' . $this->minute : $this->minute)
+            . ($this->second !== 0 || $this->nano !== 0 ? ':' . ($this->second < 10 ? '0' . $this->second : $this->second) : '')
+            . ($this->nano !== 0 ? '.' . rtrim(str_pad((string) $this->nano, 9, '0', STR_PAD_LEFT), '0') : '');
     }
 
     /**

src/MonthDay.php

@@ -10,8 +10,6 @@
 use Brick\DateTime\Parser\IsoParsers;
 use JsonSerializable;
 
-use function sprintf;
-
 /**
  * A month-day in the ISO-8601 calendar system, such as `--12-03`.
  */
@@ -238,7 +236,11 @@ public function jsonSerialize(): string
      */
     public function toISOString(): string
     {
-        return sprintf('--%02d-%02d', $this->month, $this->day);
+        // This code is optimized for high performance
+        return '--'
+            . ($this->month < 10 ? '0' . $this->month : $this->month)
+            . '-'
+            . ($this->day < 10 ? '0' . $this->day : $this->day);
     }
 
     /**

src/YearMonth.php

@@ -11,7 +11,9 @@
 use Brick\DateTime\Utility\Math;
 use JsonSerializable;
 
-use function sprintf;
+use function str_pad;
+
+use const STR_PAD_LEFT;
 
 /**
  * Represents the combination of a year and a month.
@@ -300,9 +302,17 @@ public function jsonSerialize(): string
      */
     public function toISOString(): string
     {
-        $pattern = ($this->year < 0 ? '%05d' : '%04d') . '-%02d';
-
-        return sprintf($pattern, $this->year, $this->month);
+        // This code is optimized for high performance
+        return ($this->year < 1000 && $this->year > -1000
+                ? (
+                    $this->year < 0
+                        ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
+                        : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
+                )
+                : $this->year
+            )
+            . '-'
+            . ($this->month < 10 ? '0' . $this->month : $this->month);
     }
 
     /**

src/YearWeek.php

@@ -10,7 +10,9 @@
 use Brick\DateTime\Parser\IsoParsers;
 use JsonSerializable;
 
-use function sprintf;
+use function str_pad;
+
+use const STR_PAD_LEFT;
 
 /**
  * Represents the combination of a year and a week.
@@ -308,9 +310,17 @@ public function jsonSerialize(): string
      */
     public function toISOString(): string
     {
-        $pattern = ($this->year < 0 ? '%05d' : '%04d') . '-W%02d';
-
-        return sprintf($pattern, $this->year, $this->week);
+        // This code is optimized for high performance
+        return ($this->year < 1000 && $this->year > -1000
+                ? (
+                    $this->year < 0
+                        ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
+                        : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
+                )
+                : $this->year
+            )
+            . '-W'
+            . ($this->week < 10 ? '0' . $this->week : $this->week);
     }
 
     /**

tests/LocalDateTest.php

@@ -1402,8 +1402,22 @@ public function testToString(int $year, int $month, int $day, string $expected):
     public function providerToString(): array
     {
         return [
-            [999, 1, 2, '0999-01-02'],
+            [-999999, 12, 31, '-999999-12-31'],
+            [-185321, 11, 2, '-185321-11-02'],
+            [-18532, 11, 2, '-18532-11-02'],
+            [-2023, 11, 28, '-2023-11-28'],
+            [-2023, 11, 2, '-2023-11-02'],
+            [-2023, 1, 2, '-2023-01-02'],
+            [-999, 1, 2, '-0999-01-02'],
             [-2, 1, 1, '-0002-01-01'],
+            [2, 1, 1, '0002-01-01'],
+            [999, 1, 2, '0999-01-02'],
+            [2023, 1, 2, '2023-01-02'],
+            [2023, 11, 2, '2023-11-02'],
+            [2023, 11, 28, '2023-11-28'],
+            [18532, 11, 2, '18532-11-02'],
+            [185321, 11, 2, '185321-11-02'],
+            [999999, 12, 31, '999999-12-31'],
         ];
     }
 

tests/LocalTimeTest.php

@@ -1076,6 +1076,10 @@ public function testToString(int $h, int $m, int $s, int $n, string $r): void
     public function providerToString(): array
     {
         return [
+            [0, 0, 0, 0, '00:00'],
+            [0, 1, 0, 0, '00:01'],
+            [0, 0, 1, 0, '00:00:01'],
+            [0, 0, 0, 1, '00:00:00.000000001'],
             [1, 2, 0, 0, '01:02'],
             [1, 2, 3, 0, '01:02:03'],
             [1, 2, 3, 4, '01:02:03.000000004'],

tests/YearMonthTest.php

@@ -462,9 +462,9 @@ public function providerToLocalDateRange(): array
     /**
      * @dataProvider providerToString
      */
-    public function testJsonSerialize(int $year, int $week, string $expectedString): void
+    public function testJsonSerialize(int $year, int $month, string $expectedString): void
     {
-        self::assertSame(json_encode($expectedString), json_encode(YearMonth::of($year, $week)));
+        self::assertSame(json_encode($expectedString), json_encode(YearMonth::of($year, $month)));
     }
 
     /**