refactor objects

internal/object/hash.go

@@ -3,7 +3,6 @@ package object
 import (
 	"bytes"
 	"fmt"
-	"hash/fnv"
 	"strings"
 )
 
@@ -12,29 +11,6 @@ type HashKey struct {
 	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
@@ -91,12 +67,12 @@ func (h *Hash) Add(other Object) (Object, error) {
 }
 
 func (h *Hash) Get(index Object) (Object, error) {
-	key, ok := index.(Hashable)
+	key, ok := index.(Hasher)
 	if !ok {
 		return nil, fmt.Errorf("invalid hash key %s", index.Type())
 	}
 
-	pair, found := h.Pairs[key.HashKey()]
+	pair, found := h.Pairs[key.Hash()]
 	if !found {
 		return Null{}, nil
 	}
@@ -105,12 +81,12 @@ func (h *Hash) Get(index Object) (Object, error) {
 }
 
 func (h *Hash) Set(index, other Object) error {
-	key, ok := index.(Hashable)
+	key, ok := index.(Hasher)
 	if !ok {
 		return fmt.Errorf("invalid hash key %s", index.Type())
 	}
 
-	h.Pairs[key.HashKey()] = HashPair{Key: index, Value: other}
+	h.Pairs[key.Hash()] = HashPair{Key: index, Value: other}
 
 	return nil
 }
@@ -122,8 +98,8 @@ func (h *Hash) Compare(other Object) int {
 		}
 		for _, pair := range h.Pairs {
 			left := pair.Value
-			hashed := left.(Hashable)
-			right, ok := obj.Pairs[hashed.HashKey()]
+			hashed := left.(Hasher)
+			right, ok := obj.Pairs[hashed.Hash()]
 			if !ok {
 				return -1
 			}