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package object
import (
"bytes"
"fmt"
"mana/ast"
"strings"
)
type ObjectType string
const (
INTEGER_OBJ = "INTEGER"
BOOLEAN_OBJ = "BOOLEAN"
NULL_OBJ = "NULL"
RETURN_VALUE_OBJ = "RETURN_VALUE"
FUNCTION_OBJ = "FUNCTION"
STRING_OBJ = "STRING"
ERROR_OBJ = "ERROR"
BUILTIN_OBJ = "BUILTIN"
ARRAY_OBJ = "ARRAY"
)
type Object interface {
Type() ObjectType
Inspect() string
}
type Integer struct {
Value int64
}
type Boolean struct {
Value bool
}
type Null struct{}
type ReturnValue struct {
Value Object
}
type Error struct {
Message string
}
type Function struct {
Parameters []*ast.Identifier
Body *ast.BlockStatement
Env *Environment
}
type String struct {
Value string
}
type BuiltinFunction func(args ...Object) Object
type Builtin struct {
Fn BuiltinFunction
}
type Array struct {
Elements []Object
}
func (i *Integer) Type() ObjectType {
return INTEGER_OBJ
}
func (i *Integer) Inspect() string {
return fmt.Sprintf("%d", i.Value)
}
func (b *Boolean) Type() ObjectType {
return BOOLEAN_OBJ
}
func (b *Boolean) Inspect() string {
return fmt.Sprintf("%t", b.Value)
}
func (n *Null) Type() ObjectType {
return NULL_OBJ
}
func (n *Null) Inspect() string {
return "null"
}
func (rv *ReturnValue) Type() ObjectType {
return RETURN_VALUE_OBJ
}
func (rv *ReturnValue) Inspect() string {
return rv.Value.Inspect()
}
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()
}
func (e *Error) Type() ObjectType { return ERROR_OBJ }
func (e *Error) Inspect() string { return "ERROR:" + e.Message }
func (s *String) Type() ObjectType { return STRING_OBJ }
func (s *String) Inspect() string { return s.Value }
func (b *Builtin) Type() ObjectType { return BUILTIN_OBJ }
func (b *Builtin) Inspect() string { return "builtin function" }
func (ao *Array) Type() ObjectType { return ARRAY_OBJ }
func (ao *Array) Inspect() string {
var out bytes.Buffer
elements := []string{}
for _, el := range ao.Elements {
elements = append(elements, el.Inspect())
}
out.WriteString("[")
out.WriteString(strings.Join(elements, ", "))
out.WriteString("]")
return out.String()
}
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