object

package
v1.10.1 Latest Latest
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 Go to latest Published: Mar 27, 2023 License: MIT Imports: 6 Imported by: 0

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Index

Constants

View Source 
const (
	INTEGER_OBJ      = "INTEGER"
	BOOLEAN_OBJ      = "BOOLEAN"
	STRING_OBJ       = "STRING"
	NULL_OBJ         = "NULL"
	RETURN_VALUE_OBJ = "RETURN_VALUE"
	ERROR_OBJ        = "ERROR"
	FUNCTION_OBJ     = "FUNCTION"
	BUILTIN_OBJ      = "BUILTIN"
	ARRAY_OBJ        = "ARRAY"
	HASH_OBJ         = "HASH"

	// introduced in WACIG chapter 7
	COMPILED_FUNCTION_OBJ = "COMPILED_FUNCTION"
	// introduced in WACIG chapter 9
	CLOSURE_OBJ = "CLOSURE"
)

Variables

View Source 
var Builtins = []struct {
	Name    string
	Builtin *Builtin
}{
	{
		"len",
		&Builtin{
			Fn: func(args ...Object) Object {
				if len(args) != 1 {
					return newError("wrong number of arguments. got=%d, want=1",
						len(args))
				}

				switch arg := args[0].(type) {
				case *String:
					return &Integer{Value: int64(len(arg.Value))}

				case *Array:
					return &Integer{Value: int64(len(arg.Elements))}

				default:
					return newError("argument to `len` not supported, got %s",
						args[0].Type())
				}
			},
		},
	},
	{
		"puts",
		&Builtin{
			Fn: func(args ...Object) Object {
				for _, arg := range args {
					println(arg.Inspect())
				}

				return nil
			},
		},
	},
	{
		"first",
		&Builtin{
			Fn: func(args ...Object) Object {
				if len(args) != 1 {
					return newError("wrong number of arguments. got=%d, want=1",
						len(args))
				}

				if args[0].Type() != ARRAY_OBJ {
					return newError("argument to `first` must be ARRAY, got %s",
						args[0].Type())
				}

				arr := args[0].(*Array)
				if len(arr.Elements) > 0 {
					return arr.Elements[0]
				}

				return nil
			},
		},
	},
	{
		"last",
		&Builtin{
			Fn: func(args ...Object) Object {
				if len(args) != 1 {
					return newError("wrong number of arguments. got=%d, want=1",
						len(args))
				}

				if args[0].Type() != ARRAY_OBJ {
					return newError("argument to `last` must be ARRAY, got %s",
						args[0].Type())
				}

				arr := args[0].(*Array)
				length := len(arr.Elements)
				if length > 0 {
					return arr.Elements[length-1]
				}

				return nil
			},
		},
	},
	{
		"rest",
		&Builtin{
			Fn: func(args ...Object) Object {
				if len(args) != 1 {
					return newError("wrong number of arguments. got=%d, want=1",
						len(args))
				}

				if args[0].Type() != ARRAY_OBJ {
					return newError("argument to `rest` must be ARRAY, got %s",
						args[0].Type())
				}

				arr := args[0].(*Array)
				length := len(arr.Elements)
				if length > 0 {
					newElements := make([]Object, length-1)
					copy(newElements, arr.Elements[1:length])
					return &Array{Elements: newElements}
				}

				return nil
			},
		},
	},
	{
		"push",
		&Builtin{
			Fn: func(args ...Object) Object {
				if len(args) != 2 {
					return newError("wrong number of arguments. got=%d, want=2",
						len(args))
				}

				if args[0].Type() != ARRAY_OBJ {
					return newError("argument to `push` must be ARRAY, got %s",
						args[0].Type())
				}

				arr := args[0].(*Array)
				length := len(arr.Elements)

				newElements := make([]Object, length+1)
				copy(newElements, arr.Elements)
				newElements[length] = args[1]

				return &Array{Elements: newElements}
			},
		},
	},
}

Functions

This section is empty.

Types

type Array added in v0.4.0 

type Array struct {
	Elements []Object
}

func (*Array) Inspect added in v0.4.0 

func (ao *Array) Inspect() string

func (*Array) Type added in v0.4.0 

func (ao *Array) Type() ObjectType

type Boolean 

type Boolean struct {
	Value bool
}

func (*Boolean) HashKey added in v0.4.0 

func (b *Boolean) HashKey() HashKey

func (*Boolean) Inspect 

func (b *Boolean) Inspect() string

func (*Boolean) Type 

func (b *Boolean) Type() ObjectType

type Builtin added in v0.4.0 

type Builtin struct {
	Fn BuiltinFunction
}

func GetBuiltinByName added in v1.8.0 

func GetBuiltinByName(name string) *Builtin

func (*Builtin) Inspect added in v0.4.0 

func (b *Builtin) Inspect() string

func (*Builtin) Type added in v0.4.0 

func (b *Builtin) Type() ObjectType

type BuiltinFunction added in v0.4.0 

type BuiltinFunction func(args ...Object) Object

type Closure added in v1.9.0 

type Closure struct {
	Fn   *CompiledFunction
	Free []Object
}

func (*Closure) Inspect added in v1.9.0 

func (c *Closure) Inspect() string

func (*Closure) Type added in v1.9.0 

func (c *Closure) Type() ObjectType

type CompiledFunction added in v1.7.0 

type CompiledFunction struct {
	Instructions  code.Instructions
	NumLocals     int
	NumParameters int
}

func (*CompiledFunction) Inspect added in v1.7.0 

func (cf *CompiledFunction) Inspect() string

func (*CompiledFunction) Type added in v1.7.0 

func (cf *CompiledFunction) Type() ObjectType

type Environment 

type Environment struct {
	// contains filtered or unexported fields
}

func NewEnclosedEnvironment 

func NewEnclosedEnvironment(outer *Environment) *Environment

func NewEnvironment 

func NewEnvironment() *Environment

func (*Environment) Get 

func (e *Environment) Get(name string) (Object, bool)

func (*Environment) Set 

func (e *Environment) Set(name string, val Object) Object

type Error 

type Error struct {
	Message string
}

func (*Error) Inspect 

func (e *Error) Inspect() string

func (*Error) Type 

func (e *Error) Type() ObjectType

type Function 

type Function struct {
	Parameters []*ast.Identifier
	Body       *ast.BlockStatement
	Env        *Environment
}

func (*Function) Inspect 

func (f *Function) Inspect() string

func (*Function) Type 

func (f *Function) Type() ObjectType

type Hash added in v0.4.0 

type Hash struct {
	Pairs map[HashKey]HashPair
}

func (*Hash) Inspect added in v0.4.0 

func (h *Hash) Inspect() string

func (*Hash) Type added in v0.4.0 

func (h *Hash) Type() ObjectType

type HashKey added in v0.4.0 

type HashKey struct {
	Type  ObjectType
	Value uint64
}

type HashPair added in v0.4.0 

type HashPair struct {
	Key   Object
	Value Object
}

type Hashable added in v0.4.0 

type Hashable interface {
	HashKey() HashKey
}

type Integer 

type Integer struct {
	Value int64
}

func (*Integer) HashKey added in v0.4.0 

func (i *Integer) HashKey() HashKey

func (*Integer) Inspect 

func (i *Integer) Inspect() string

func (*Integer) Type 

func (i *Integer) Type() ObjectType

type Null 

type Null struct{}

func (*Null) Inspect 

func (n *Null) Inspect() string

func (*Null) Type 

func (n *Null) Type() ObjectType

type Object 

type Object interface {
	Type() ObjectType
	Inspect() string
}

type ObjectType 

type ObjectType string

type ReturnValue 

type ReturnValue struct {
	Value Object
}

func (*ReturnValue) Inspect 

func (rv *ReturnValue) Inspect() string

func (*ReturnValue) Type 

func (rv *ReturnValue) Type() ObjectType

type String added in v0.4.0 

type String struct {
	Value string
}

func (*String) HashKey added in v0.4.0 

func (s *String) HashKey() HashKey

func (*String) Inspect added in v0.4.0 

func (s *String) Inspect() string

func (*String) Type added in v0.4.0 

func (s *String) Type() ObjectType

Source Files

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