func prep(expr *ast.Expr, expType types.Type) (uniq string, err error) {
if expr.Function != nil {
fnc := expr.GetFunction()
uniq, err = WhichFunc(fnc)
if err != nil {
return "", err
}
typ, err := funcs.Out(uniq)
if err != nil {
return "", err
}
if typ != expType {
return "", &errExpected{expType.String(), expr.String()}
}
return uniq, err
}
if expr.List != nil {
if !types.IsList(expType) {
return "", &errExpected{expType.String(), expr.String()}
}
}
typ, err := Which(expr)
if err != nil {
return "", err
}
if typ != expType {
return "", &errExpected{expType.String(), expr.String()}
}
return "", nil
}
//String returns the relapse string representation of the Variable instance.
func (this *Variable) String() string {
typ := this.GetType()
if types.IsList(typ) {
types.ListToSingle(typ)
}
switch typ {
case types.SINGLE_DOUBLE:
return "$double"
case types.SINGLE_INT:
return "$int"
case types.SINGLE_UINT:
return "$uint"
case types.SINGLE_BOOL:
return "$bool"
case types.SINGLE_STRING:
return "$string"
case types.SINGLE_BYTES:
return "$[]byte"
}
panic(fmt.Errorf("unknown type %s", this.GetType()))
}
//ConvertBuiltInIntoFunction converts a BuiltIn Expr into a Function Expr.
func ConvertBuiltInIntoFunction(e *ast.Expr) (*ast.Expr, error) {
if e.BuiltIn == nil {
return e, nil
}
s := e.GetBuiltIn().GetSymbol().GetValue()
right := e.GetBuiltIn().GetExpr().Clone()
typ, err := Which(right)
if err != nil {
return nil, err
}
if types.IsList(typ) {
typ = types.ListToSingle(typ)
}
left := ast.NewVar(typ)
funcName := ast.BuiltInFunctionName(s)
e2 := ast.NewNestedFunction(funcName, left, right)
if funcName == "regex" {
e2 = ast.NewNestedFunction(funcName, right, ast.NewVar(types.SINGLE_STRING))
} else if funcName == "type" {
e2 = ast.NewNestedFunction(funcName, right)
}
return e2, nil
}