update less.php to PHP 7.x compatible fork

1 files changed, 187 insertions, 0 deletions

diff --git a/lib/less.php/SourceMap/Base64VLQ.php b/lib/less.php/SourceMap/Base64VLQ.php
new file mode 100644
index 0000000..f5b200c
--- /dev/null
+++ b/lib/less.php/SourceMap/Base64VLQ.php
@@ -0,0 +1,187 @@
+<?php
+
+/**
+ * Encode / Decode Base64 VLQ.
+ *
+ * @package Less
+ * @subpackage SourceMap
+ */
+class Less_SourceMap_Base64VLQ {
+
+	/**
+	 * Shift
+	 *
+	 * @var integer
+	 */
+	private $shift = 5;
+
+	/**
+	 * Mask
+	 *
+	 * @var integer
+	 */
+	private $mask = 0x1F; // == (1 << shift) == 0b00011111
+
+	/**
+	 * Continuation bit
+	 *
+	 * @var integer
+	 */
+	private $continuationBit = 0x20; // == (mask - 1 ) == 0b00100000
+
+	/**
+	 * Char to integer map
+	 *
+	 * @var array
+	 */
+	private $charToIntMap = array(
+		'A' => 0, 'B' => 1, 'C' => 2, 'D' => 3, 'E' => 4, 'F' => 5, 'G' => 6,
+		'H' => 7,'I' => 8, 'J' => 9, 'K' => 10, 'L' => 11, 'M' => 12, 'N' => 13,
+		'O' => 14, 'P' => 15, 'Q' => 16, 'R' => 17, 'S' => 18, 'T' => 19, 'U' => 20,
+		'V' => 21, 'W' => 22, 'X' => 23, 'Y' => 24, 'Z' => 25, 'a' => 26, 'b' => 27,
+		'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31, 'g' => 32, 'h' => 33, 'i' => 34,
+		'j' => 35, 'k' => 36, 'l' => 37, 'm' => 38, 'n' => 39, 'o' => 40, 'p' => 41,
+		'q' => 42, 'r' => 43, 's' => 44, 't' => 45, 'u' => 46, 'v' => 47, 'w' => 48,
+		'x' => 49, 'y' => 50, 'z' => 51, 0 => 52, 1 => 53, 2 => 54, 3 => 55, 4 => 56,
+		5 => 57,	6 => 58, 7 => 59, 8 => 60, 9 => 61, '+' => 62, '/' => 63,
+	);
+
+	/**
+	 * Integer to char map
+	 *
+	 * @var array
+	 */
+	private $intToCharMap = array(
+		0 => 'A', 1 => 'B', 2 => 'C', 3 => 'D', 4 => 'E', 5 => 'F', 6 => 'G',
+		7 => 'H', 8 => 'I', 9 => 'J', 10 => 'K', 11 => 'L', 12 => 'M', 13 => 'N',
+		14 => 'O', 15 => 'P', 16 => 'Q', 17 => 'R', 18 => 'S', 19 => 'T', 20 => 'U',
+		21 => 'V', 22 => 'W', 23 => 'X', 24 => 'Y', 25 => 'Z', 26 => 'a', 27 => 'b',
+		28 => 'c', 29 => 'd', 30 => 'e', 31 => 'f', 32 => 'g', 33 => 'h', 34 => 'i',
+		35 => 'j', 36 => 'k', 37 => 'l', 38 => 'm', 39 => 'n', 40 => 'o', 41 => 'p',
+		42 => 'q', 43 => 'r', 44 => 's', 45 => 't', 46 => 'u', 47 => 'v', 48 => 'w',
+		49 => 'x', 50 => 'y', 51 => 'z', 52 => '0', 53 => '1', 54 => '2', 55 => '3',
+		56 => '4', 57 => '5', 58 => '6', 59 => '7', 60 => '8', 61 => '9', 62 => '+',
+		63 => '/',
+	);
+
+	/**
+	 * Constructor
+	 */
+	public function __construct(){
+		// I leave it here for future reference
+		// foreach(str_split('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/') as $i => $char)
+		// {
+		//	 $this->charToIntMap[$char] = $i;
+		//	 $this->intToCharMap[$i] = $char;
+		// }
+	}
+
+	/**
+	 * Convert from a two-complement value to a value where the sign bit is
+	 * is placed in the least significant bit.	For example, as decimals:
+	 *	 1 becomes 2 (10 binary), -1 becomes 3 (11 binary)
+	 *	 2 becomes 4 (100 binary), -2 becomes 5 (101 binary)
+	 * We generate the value for 32 bit machines, hence -2147483648 becomes 1, not 4294967297,
+	 * even on a 64 bit machine.
+	 * @param string $aValue
+	 */
+	public function toVLQSigned($aValue){
+		return 0xffffffff & ($aValue < 0 ? ((-$aValue) << 1) + 1 : ($aValue << 1) + 0);
+	}
+
+	/**
+	 * Convert to a two-complement value from a value where the sign bit is
+	 * is placed in the least significant bit. For example, as decimals:
+	 *	 2 (10 binary) becomes 1, 3 (11 binary) becomes -1
+	 *	 4 (100 binary) becomes 2, 5 (101 binary) becomes -2
+	 * We assume that the value was generated with a 32 bit machine in mind.
+	 * Hence
+	 *	 1 becomes -2147483648
+	 * even on a 64 bit machine.
+	 * @param integer $aValue
+	 */
+	public function fromVLQSigned($aValue){
+		return $aValue & 1 ? $this->zeroFill(~$aValue + 2, 1) | (-1 - 0x7fffffff) : $this->zeroFill($aValue, 1);
+	}
+
+	/**
+	 * Return the base 64 VLQ encoded value.
+	 *
+	 * @param string $aValue The value to encode
+	 * @return string The encoded value
+	 */
+	public function encode($aValue){
+		$encoded = '';
+		$vlq = $this->toVLQSigned($aValue);
+		do
+		{
+			$digit = $vlq & $this->mask;
+			$vlq = $this->zeroFill($vlq, $this->shift);
+			if($vlq > 0){
+				$digit |= $this->continuationBit;
+			}
+			$encoded .= $this->base64Encode($digit);
+		} while($vlq > 0);
+
+		return $encoded;
+	}
+
+	/**
+	 * Return the value decoded from base 64 VLQ.
+	 *
+	 * @param string $encoded The encoded value to decode
+	 * @return integer The decoded value
+	 */
+	public function decode($encoded){
+		$vlq = 0;
+		$i = 0;
+		do
+		{
+			$digit = $this->base64Decode($encoded[$i]);
+			$vlq |= ($digit & $this->mask) << ($i * $this->shift);
+			$i++;
+		} while($digit & $this->continuationBit);
+
+		return $this->fromVLQSigned($vlq);
+	}
+
+	/**
+	 * Right shift with zero fill.
+	 *
+	 * @param integer $a number to shift
+	 * @param integer $b number of bits to shift
+	 * @return integer
+	 */
+	public function zeroFill($a, $b){
+		return ($a >= 0) ? ($a >> $b) : ($a >> $b) & (PHP_INT_MAX >> ($b - 1));
+	}
+
+	/**
+	 * Encode single 6-bit digit as base64.
+	 *
+	 * @param integer $number
+	 * @return string
+	 * @throws Exception If the number is invalid
+	 */
+	public function base64Encode($number){
+		if($number < 0 || $number > 63){
+			throw new Exception(sprintf('Invalid number "%s" given. Must be between 0 and 63.', $number));
+		}
+		return $this->intToCharMap[$number];
+	}
+
+	/**
+	 * Decode single 6-bit digit from base64
+	 *
+	 * @param string $char
+	 * @return number
+	 * @throws Exception If the number is invalid
+	 */
+	public function base64Decode($char){
+		if(!array_key_exists($char, $this->charToIntMap)){
+			throw new Exception(sprintf('Invalid base 64 digit "%s" given.', $char));
+		}
+		return $this->charToIntMap[$char];
+	}
+
+}