Missing != operator, added test for all of them.

src/asl/parser.go

@@ -326,7 +326,7 @@ func parseParameter(out bool) (string, int) {
 func parseExpression(out bool) string {
 	output := parseArith()
 
-	for accept("<") || accept(">") || accept("&") || accept("|") || accept("=") {
+	for accept("<") || accept(">") || accept("&") || accept("|") || accept("=") || accept("!") {
 		if accept("<") {
 			output += "<"
 			next()
@@ -341,9 +341,13 @@ func parseExpression(out bool) string {
 			next()
 			expect("|")
 			output += "||"
-		} else {
+		} else if accept("=") {
 			output += "="
 			next()
+		} else {
+		    next()
+		    expect("=")
+		    output += "!="
 		}
 
 		if accept("=") {

src/asl/parser_test.go

@@ -94,6 +94,13 @@ func TestParserBuildinFunctionCall(t *testing.T) {
 	equal(t, got, want)
 }
 
+func TestParserOperator(t *testing.T) {
+	got := getCompiled(t, "test/parser_operator.asl")
+	want := "if (x==y&&x!=y&&x<=y&&x>=y&&x<y&&x>y) then {\n};\n"
+
+	equal(t, got, want)
+}
+
 func getCompiled(t *testing.T, file string) string {
 	code, err := ioutil.ReadFile(file)