package object import ( "bytes" "fmt" "monkey/ast" "strings" ) type ObjectType string const ( NULL_OBJ = "NULL" ERROR_OBJ = "ERROR" INTEGER_OBJ = "INTEGER" BOOLEAN_OBJ = "BOOLEAN" RETURN_VALUE_OBJ = "RETURN_VALUE" FUNCTION_OBJ = "FUNCTION" ) type Object interface { Type() ObjectType Inspect() string } type Integer struct { Value int64 } func (i *Integer) Type() ObjectType { return INTEGER_OBJ } func (i *Integer) Inspect() string { return fmt.Sprintf("%d", i.Value) } type Boolean struct { Value bool } func (b *Boolean) Type() ObjectType { return BOOLEAN_OBJ } func (b *Boolean) Inspect() string { return fmt.Sprintf("%t", b.Value) } type Null struct{} func (n *Null) Type() ObjectType { return NULL_OBJ } func (n *Null) Inspect() string { return "null" } type ReturnValue struct { Value Object } func (rv *ReturnValue) Type() ObjectType { return RETURN_VALUE_OBJ } func (rv *ReturnValue) Inspect() string { return rv.Value.Inspect() } type Error struct { Message string } func (e *Error) Type() ObjectType { return ERROR_OBJ } func (e *Error) Inspect() string { return "ERROR: " + e.Message } type Function struct { Parameters []*ast.Identifier Body *ast.BlockStatement Env *Environment } func (f *Function) Type() ObjectType { return FUNCTION_OBJ } func (f *Function) Inspect() string { var out bytes.Buffer params := []string{} for _, p := range f.Parameters { params = append(params, p.String()) } out.WriteString("fn") out.WriteString("(") out.WriteString(strings.Join(params, ", ")) out.WriteString(") {\n") out.WriteString(f.Body.String()) out.WriteString("\n}") return out.String() }