Compiler arrays (#49)

* implemented operation and param flags in the cli invoke cmd.

* reverted prev changes and added debug flag for compiling.

* change transactionType variable to Type, for package convention

* index support for arrays.

* implemented builtin (len) for the compiler.

* bumped version -> 0.35.0

* updated compiler README and changed invoke to testinvoke.

pkg/vm/compiler/tests/array_test.go

@@ -23,4 +23,81 @@ var arrayTestCases = []testCase{
 		`,
 		"52c56b06666f6f6261720362617203666f6f53c16c766b00527ac46203006c766b00c3616c7566",
 	},
+	{
+		"array item assign",
+		`
+		package foo
+		func Main() int {
+			x := []int{0, 1, 2}
+			y := x[0]
+			return y
+		}
+		`,
+		"53c56b52510053c16c766b00527ac46c766b00c300c36c766b51527ac46203006c766b51c3616c7566",
+	},
+	{
+		"array item return",
+		`
+		package foo
+		func Main() int {
+			x := []int{0, 1, 2}
+			return x[1]
+		}
+		`,
+		"52c56b52510053c16c766b00527ac46203006c766b00c351c3616c7566",
+	},
+	{
+		"array item in bin expr",
+		`
+		package foo
+		func Main() int {
+			x := []int{0, 1, 2}
+			return x[1] + 10
+		}
+		`,
+		"52c56b52510053c16c766b00527ac46203006c766b00c351c35a93616c7566",
+	},
+	{
+		"array item ident",
+		`
+		package foo
+		func Main() int {
+			x := 1
+			y := []int{0, 1, 2}
+			return y[x]
+		}
+		`,
+		"53c56b516c766b00527ac452510053c16c766b51527ac46203006c766b51c36c766b00c3c3616c7566",
+	},
+	{
+		"array item index with binExpr",
+		`
+		package foo
+		func Main() int {
+			x := 1
+			y := []int{0, 1, 2}
+			return y[x + 1]
+		}
+		`,
+		"53c56b516c766b00527ac452510053c16c766b51527ac46203006c766b51c36c766b00c35193c3616c7566",
+	},
+	{
+		"array item struct",
+		`
+		package foo
+
+		type Bar struct {
+			arr []int
+		}
+
+		func Main() int {
+			b := Bar{
+				arr: []int{0, 1, 2},
+			}
+			x := b.arr[2]
+			return x + 2
+		}
+		`,
+		"53c56b6151c66b52510053c16c766b00527ac46c6c766b00527ac46c766b00c300c352c36c766b51527ac46203006c766b51c35293616c7566",
+	},
 }