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