parsing real, ureal values on output

dist/ethereum.js

@@ -194,13 +194,19 @@ var toAbiInput = function (json, methodName, params) {
     return bytes;
 };
 
+/// Check if input value is negative
+/// @param value is hex format
+/// @returns true if it is negative, otherwise false
+var signedIsNegative = function (value) {
+    return (new BigNumber(value.substr(0, 1), 16).toString(2).substr(0, 1)) === '1';
+};
+
 /// Formats input right-aligned input bytes to int
 /// @returns right-aligned input bytes formatted to int
 var formatOutputInt = function (value) {
     // check if it's negative number
     // it it is, return two's complement
-    var firstBit = new BigNumber(value.substr(0, 1), 16).toString(2).substr(0, 1);
-    if (firstBit === '1') {
+    if (signedIsNegative(value)) {
         return new BigNumber(value, 16).minus(new BigNumber('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)).minus(1);
     }
     return new BigNumber(value, 16);
@@ -212,6 +218,16 @@ var formatOutputUInt = function (value) {
     return new BigNumber(value, 16);
 };
 
+/// @returns input bytes formatted to real
+var formatOutputReal = function (value) {
+    return formatOutputInt(value).dividedBy(new BigNumber(2).pow(128)); 
+};
+
+/// @returns input bytes formatted to ureal
+var formatOutputUReal = function (value) {
+    return formatOutputUInt(value).dividedBy(new BigNumber(2).pow(128)); 
+};
+
 /// @returns right-aligned input bytes formatted to hex
 var formatOutputHash = function (value) {
     return "0x" + value;
@@ -247,8 +263,8 @@ var setupOutputTypes = function () {
         { type: prefixedType('int'), format: formatOutputInt },
         { type: prefixedType('hash'), format: formatOutputHash },
         { type: prefixedType('string'), format: formatOutputString },
-        { type: prefixedType('real'), format: formatOutputInt },
-        { type: prefixedType('ureal'), format: formatOutputInt },
+        { type: prefixedType('real'), format: formatOutputReal },
+        { type: prefixedType('ureal'), format: formatOutputUReal },
         { type: namedType('address'), format: formatOutputAddress },
         { type: namedType('bool'), format: formatOutputBool }
     ];

lib/abi.js

@@ -193,13 +193,19 @@ var toAbiInput = function (json, methodName, params) {
     return bytes;
 };
 
+/// Check if input value is negative
+/// @param value is hex format
+/// @returns true if it is negative, otherwise false
+var signedIsNegative = function (value) {
+    return (new BigNumber(value.substr(0, 1), 16).toString(2).substr(0, 1)) === '1';
+};
+
 /// Formats input right-aligned input bytes to int
 /// @returns right-aligned input bytes formatted to int
 var formatOutputInt = function (value) {
     // check if it's negative number
     // it it is, return two's complement
-    var firstBit = new BigNumber(value.substr(0, 1), 16).toString(2).substr(0, 1);
-    if (firstBit === '1') {
+    if (signedIsNegative(value)) {
         return new BigNumber(value, 16).minus(new BigNumber('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)).minus(1);
     }
     return new BigNumber(value, 16);
@@ -211,6 +217,16 @@ var formatOutputUInt = function (value) {
     return new BigNumber(value, 16);
 };
 
+/// @returns input bytes formatted to real
+var formatOutputReal = function (value) {
+    return formatOutputInt(value).dividedBy(new BigNumber(2).pow(128)); 
+};
+
+/// @returns input bytes formatted to ureal
+var formatOutputUReal = function (value) {
+    return formatOutputUInt(value).dividedBy(new BigNumber(2).pow(128)); 
+};
+
 /// @returns right-aligned input bytes formatted to hex
 var formatOutputHash = function (value) {
     return "0x" + value;
@@ -246,8 +262,8 @@ var setupOutputTypes = function () {
         { type: prefixedType('int'), format: formatOutputInt },
         { type: prefixedType('hash'), format: formatOutputHash },
         { type: prefixedType('string'), format: formatOutputString },
-        { type: prefixedType('real'), format: formatOutputInt },
-        { type: prefixedType('ureal'), format: formatOutputInt },
+        { type: prefixedType('real'), format: formatOutputReal },
+        { type: prefixedType('ureal'), format: formatOutputUReal },
         { type: namedType('address'), format: formatOutputAddress },
         { type: namedType('bool'), format: formatOutputBool }
     ];

test/abi.parsers.js

@@ -419,7 +419,6 @@ describe('abi', function() {
                 
         });
 
-
     });
 
     describe('outputParser', function() {
@@ -673,12 +672,52 @@ describe('abi', function() {
             var parser = abi.outputParser(d);
 
             // then
-            assert.equal(parser.test("000000000000000000000000000000000000000000000000000000000000000001")[0], true);
-            assert.equal(parser.test("000000000000000000000000000000000000000000000000000000000000000000")[0], false);
+            assert.equal(parser.test("0x0000000000000000000000000000000000000000000000000000000000000001")[0], true);
+            assert.equal(parser.test("0x0000000000000000000000000000000000000000000000000000000000000000")[0], false);
             
 
         });
 
+        it('should parse output real', function() {
+            
+            // given
+            var d = clone(description); 
+
+            d[0].outputs = [
+                { type: 'real' }
+            ];
+
+            // when
+            var parser = abi.outputParser(d);
+
+            // then
+            assert.equal(parser.test("0x0000000000000000000000000000000100000000000000000000000000000000")[0], 1);
+            assert.equal(parser.test("0x0000000000000000000000000000000220000000000000000000000000000000")[0], 2.125); 
+            assert.equal(parser.test("0x0000000000000000000000000000000880000000000000000000000000000000")[0], 8.5); 
+            assert.equal(parser.test("0xffffffffffffffffffffffffffffffff00000000000000000000000000000000")[0], -1); 
+            
+        });
+
+        it('should parse output ureal', function() {
+
+            // given
+            var d = clone(description); 
+
+            d[0].outputs = [
+                { type: 'ureal' }
+            ];
+
+            // when
+            var parser = abi.outputParser(d);
+
+            // then
+            assert.equal(parser.test("0x0000000000000000000000000000000100000000000000000000000000000000")[0], 1);
+            assert.equal(parser.test("0x0000000000000000000000000000000220000000000000000000000000000000")[0], 2.125); 
+            assert.equal(parser.test("0x0000000000000000000000000000000880000000000000000000000000000000")[0], 8.5); 
+
+        });
+        
+
         it('should parse multiple output strings', function() {
 
             // given