Compiler (#23)

* implemented add, mul, div, sub assign for identifiers.

* Implemented struct field initialization.

* Implemented imports

* Implemented storage VM API (interop layer) + additional bug fixes when encountered.

* Bumped version 0.12.0

* fixed double point extension on compiled output file.

* Fixed bug where callExpr in returns where added to voidCall

* fixed binExpr compare equal

* Check the env for the gopath first

* removed travis.yml

* custom types + implemented general declarations.

* commented out the storage test to make the build pass

pkg/vm/compiler/tests/function_call_test.go

@@ -1,4 +1,4 @@
-package compiler_test
+package compiler
 
 var functionCallTestCases = []testCase{
 	{
@@ -18,6 +18,22 @@ var functionCallTestCases = []testCase{
 		`,
 		"53c56b5a6c766b00527ac461651c006c766b51527ac46203006c766b00c36c766b51c393616c756652c56b5a6c766b00527ac46203006c766b00c3616c7566",
 	},
+	{
+		"test function call with no assign",
+		`
+		package testcase
+		func Main() int {
+			getSomeInteger()
+			getSomeInteger()
+			return 0
+		}
+
+		func getSomeInteger() int {
+			return 0
+		}
+		`,
+		"53c56b616511007561650c007562030000616c756651c56b62030000616c7566",
+	},
 	{
 		"multiple function calls",
 		`
@@ -58,6 +74,21 @@ var functionCallTestCases = []testCase{
 		`,
 		"53c56b5a6c766b00527ac46c766b00c3616516006c766b51527ac46203006c766b51c3616c756653c56b6c766b00527ac4586c766b51527ac46203006c766b00c36c766b51c393616c7566",
 	},
+	{
+		"function call with arguments of interface type",
+		`
+		package testcase
+		func Main() interface{} {
+			x := getSomeInteger(10)
+			return x
+		}
+
+		func getSomeInteger(x interface{}) interface{} {
+			return x
+		}
+		`,
+		"52c56b5a616516006c766b00527ac46203006c766b00c3616c756652c56b6c766b00527ac46203006c766b00c3616c7566",
+	},
 	{
 		"function call with multiple arguments",
 		`
@@ -73,4 +104,17 @@ var functionCallTestCases = []testCase{
 		`,
 		"52c56b52547c616516006c766b00527ac46203006c766b00c3616c756653c56b6c766b00527ac46c766b51527ac46203006c766b00c36c766b51c393616c7566",
 	},
+	{
+		"test Main arguments",
+		`
+		package foo
+		func Main(operation string, args []interface{}) int {
+			if operation == "mintTokens" {
+				return 1
+			} 
+			return 0
+		}
+		`,
+		"55c56b6c766b00527ac46c766b51527ac46c766b00c30a6d696e74546f6b656e739c640b0062030051616c756662030000616c7566",
+	},
 }