Fixed ! operator and negative value prefix (e.g. -100).

src/asl/parser.go

@@ -379,10 +379,20 @@ func parseExpression(out bool) string {
 func parseIdentifier() string {
     output := ""
     
-    if seek("(") {
+    if seek("(") && !accept("!") && !accept("-") {
         name := get().token
         next()
         output = "("+parseFunctionCall(false, name)+")"
+    } else if accept("!") || accept("-") {
+        output = get().token
+        next()
+        
+        if !accept("(") {
+            output += get().token
+            next()
+        } else {
+            output += parseTerm()
+        }
     } else {
         output = get().token
         next()

src/asl/parser_test.go

@@ -68,7 +68,7 @@ func TestParserAssignResult(t *testing.T) {
 
 func TestParserExpression(t *testing.T) {
     got := getCompiled(t, "test/parser_expression.asl")
-    want := "x = (1+(2+3))/(6*(someVariable+99-100))-(20)+anotherVariable+([] call foo);\n"
+    want := "x = -(1+(2+3))/(6*(someVariable+99-100))-(20)+!anotherVariable+([] call foo);\n"
     
     equal(t, got, want)
 }