Adds ability to pass requested data layout to decoders and tuple support.

src/Contract.php

@@ -26,6 +26,7 @@ use Web3\Contracts\Types\DynamicBytes;
 use Web3\Contracts\Types\Integer;
 use Web3\Contracts\Types\Str;
 use Web3\Contracts\Types\Uinteger;
+use Web3\Contracts\Types\Tuple;
 use Web3\Validators\AddressValidator;
 use Web3\Validators\HexValidator;
 use Web3\Validators\StringValidator;
@@ -154,15 +155,7 @@ class Contract
         }
         $this->abi = $abiArray;
         $this->eth = new Eth($this->provider);
-        $this->ethabi = new Ethabi([
+        $this->ethabi = Ethabi::factory();
-            'address' => new Address,
-            'bool' => new Boolean,
-            'bytes' => new Bytes,
-            'dynamicBytes' => new DynamicBytes,
-            'int' => new Integer,
-            'string' => new Str,
-            'uint' => new Uinteger,
-        ]);
     }
 
     /**

src/Contracts/Ethabi.php

@@ -13,6 +13,14 @@ namespace Web3\Contracts;
 
 use InvalidArgumentException;
 use stdClass;
+use Web3\Contracts\Types\Address;
+use Web3\Contracts\Types\Boolean;
+use Web3\Contracts\Types\Bytes;
+use Web3\Contracts\Types\DynamicBytes;
+use Web3\Contracts\Types\Integer;
+use Web3\Contracts\Types\Str;
+use Web3\Contracts\Types\Tuple;
+use Web3\Contracts\Types\Uinteger;
 use Web3\Utils;
 use Web3\Formatters\IntegerFormatter;
 
@@ -55,6 +63,20 @@ class Ethabi
         return false;
     }
 
+    public static function factory()
+	{
+		return new Ethabi([
+			'address' => new Address,
+			'bool' => new Boolean,
+			'bytes' => new Bytes,
+			'dynamicBytes' => new DynamicBytes,
+			'int' => new Integer,
+			'string' => new Str,
+			'uint' => new Uinteger,
+			'tuple' => new Tuple
+		]);
+	}
+    
     /**
      * set
      * 
@@ -235,11 +257,13 @@ class Ethabi
         $param = mb_strtolower(Utils::stripZero($param));
 
         for ($i=0; $i<$typesLength; $i++) {
-            if (isset($outputTypes['outputs'][$i]['name']) && empty($outputTypes['outputs'][$i]['name']) === false) {
+         
-                $result[$outputTypes['outputs'][$i]['name']] = $solidityTypes[$i]->decode($param, $offsets[$i], $types[$i]);
+        	$output_type_hint = $outputTypes['outputs'][$i] ?? false;
-            } else {
+        	$name = $outputTypes['outputs'][$i]['name'] ?? "";
-                $result[$i] = $solidityTypes[$i]->decode($param, $offsets[$i], $types[$i]);
+        	if (empty($name))
-            }
+        		$name = $i;
+			$result[$name] = $solidityTypes[$i]->decode($param, $offsets[$i], $types[$i], $output_type_hint);
+			
         }
 
         return $result;

src/Contracts/SolidityType.php

@@ -229,7 +229,7 @@ class SolidityType
      * @param string $name
      * @return array
      */
-    public function decode($value, $offset, $name)
+    public function decode($value, $offset, $name, $output_type_hint = false)
     {
         if ($this->isDynamicArray($name)) {
             $arrayOffset = (int) Utils::toBn('0x' . mb_substr($value, $offset * 2, 64))->toString();
@@ -263,7 +263,7 @@ class SolidityType
             $length = (int) Utils::toBn('0x' . mb_substr($value, $dynamicOffset * 2, 64))->toString();
             $roundedLength = floor(($length + 31) / 32);
             $param = mb_substr($value, $dynamicOffset * 2, ( 1 + $roundedLength) * 64);
-            return $this->outputFormat($param, $name);
+            return $this->outputFormat($param, $name, $output_type_hint);
         }
         $length = $this->staticPartLength($name);
         $param = mb_substr($value, $offset * 2, $length * 2);

src/Contracts/Types/Tuple.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Web3\Contracts\Types;
+
+use Web3\Contracts\Ethabi;
+use Web3\Contracts\SolidityType;
+use Web3\Contracts\Types\IType;
+
+class Tuple extends SolidityType implements IType
+{
+	public function __construct()
+	{
+	}
+	
+	public function isType($name)
+	{
+		return (preg_match('/^tuple(\[([0-9]*)\])*$/', $name) === 1);
+	}
+	
+	public function isDynamicType()
+	{
+		return true;
+	}
+	
+	public function inputFormat($value, $name)
+	{
+		return $value;
+	}
+	
+	public function outputFormat($value, $name, $output_type_hint)
+	{
+		$ethabi = Ethabi::factory();
+		$types = $output_type_hint['components'] ?? false;
+		if (!is_array($types)) {
+			throw new InvalidArgumentException('Output type is required for tuple.');
+		}
+		return $ethabi->decodeParameters(['outputs'=>$types], $value);
+	}
+}