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object.go
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object.go
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package object
import (
"bytes"
"fmt"
"hash/fnv"
"strings"
"github.com/mmyoji/go-monkey/ast"
)
type ObjectType string
const (
INTEGER_OBJ = "INTEGER"
BOOLEAN_OBJ = "BOOLEAN"
NULL_OBJ = "NULL"
RETURN_VALUE_OBJ = "RETURN_VALUE"
ERROR_OBJ = "ERROR"
FUNCTION_OBJ = "FUNCTION"
STRING_OBJ = "STRING"
BUILTIN_OBJ = "BUILTIN"
ARRAY_OBJ = "ARRAY"
HASH_OBJ = "HASH"
)
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()
}
type String struct {
Value string
}
func (s *String) Type() ObjectType { return STRING_OBJ }
func (s *String) Inspect() string { return s.Value }
type BuiltinFunction func(args ...Object) Object
type Builtin struct {
Fn BuiltinFunction
}
func (b *Builtin) Type() ObjectType { return BUILTIN_OBJ }
func (b *Builtin) Inspect() string { return "builtin function" }
type Array struct {
Elements []Object
}
func (ao *Array) Type() ObjectType { return ARRAY_OBJ }
func (ao *Array) Inspect() string {
var out bytes.Buffer
elements := []string{}
for _, e := range ao.Elements {
elements = append(elements, e.Inspect())
}
out.WriteString("[")
out.WriteString(strings.Join(elements, ", "))
out.WriteString("]")
return out.String()
}
type Hashable interface {
HashKey() HashKey
}
type HashKey struct {
Type ObjectType
Value uint64
}
func (b *Boolean) HashKey() HashKey {
var value uint64
if b.Value {
value = 1
} else {
value = 0
}
return HashKey{Type: b.Type(), Value: value}
}
func (i *Integer) HashKey() HashKey {
return HashKey{Type: i.Type(), Value: uint64(i.Value)}
}
func (s *String) HashKey() HashKey {
h := fnv.New64a()
h.Write([]byte(s.Value))
return HashKey{Type: s.Type(), Value: h.Sum64()}
}
type HashPair struct {
Key Object
Value Object
}
type Hash struct {
Pairs map[HashKey]HashPair
}
func (h *Hash) Type() ObjectType { return HASH_OBJ }
func (h *Hash) Inspect() string {
var out bytes.Buffer
pairs := []string{}
for _, pair := range h.Pairs {
pairs = append(pairs, fmt.Sprintf("%s: %s", pair.Key.Inspect(), pair.Value.Inspect()))
}
out.WriteString("{")
out.WriteString(strings.Join(pairs, ", "))
out.WriteString("}")
return out.String()
}