func builtinNot(context *runtime.FunctionCallContext) (*runtime.Value, error) {
if err := runtime.ValidateArguments(context, runtime.BooleanValue); err != nil {
return nil, err
}
return runtime.BooleanValueFor(!context.Args[0].Boolean), nil
}
func stringsCharacterCheck(context *runtime.FunctionCallContext) (*runtime.Value, error) {
if err := runtime.ValidateArguments(context, runtime.StringValue); err != nil {
return nil, err
}
s := context.Args[0].Str
if len(s) != 1 {
return nil, runtime.NewRuntimeError(context.Pos, "expected string that has 1 character, got %d character(s)", len(s))
}
var callback func(rune) bool
switch context.Name {
case "is-digit":
callback = unicode.IsDigit
case "is-letter":
callback = unicode.IsLetter
case "is-lower":
callback = unicode.IsLower
case "is-upper":
callback = unicode.IsUpper
}
return runtime.BooleanValueFor(callback(rune(s[0]))), nil
}
func stringsContains(context *runtime.FunctionCallContext) (*runtime.Value, error) {
if err := runtime.ValidateArguments(context, runtime.StringValue, runtime.StringValue); err != nil {
return nil, err
}
return runtime.BooleanValueFor(strings.Contains(context.Args[0].Str, context.Args[1].Str)), nil
}
func builtinMathCmp(context *runtime.FunctionCallContext) (*runtime.Value, error) {
if err := runtime.ValidateArguments(context, runtime.NumberValue, runtime.NumberValue); err != nil {
return nil, err
}
n1 := context.Args[0].Number
n2 := context.Args[1].Number
ok := false
switch context.Name {
case ">":
ok = n1.Cmp(n2) == 1
case ">=":
ok = n1.Cmp(n2) >= 0
case "<":
ok = n1.Cmp(n2) == -1
case "<=":
ok = n1.Cmp(n2) <= 0
}
return runtime.BooleanValueFor(ok), nil
}