eval

package
v0.0.0-...-3085ebc Latest Latest
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 Go to latest Published: Nov 10, 2022 License: MIT Imports: 9 Imported by: 0

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Index

Constants

View Source 
const (
	NUMBER_OBJ       = "NUMBER"
	NIL_OBJ          = "NIL_OBJ"
	BOOLEAN_OBJ      = "BOOLEAN"
	STRING_OBJ       = "STRING"
	ERROR_OBJ        = "ERROR"
	RETURN_VALUE_OBJ = "RETURN_VALUE"
	FUNCTION_OBJ     = "FUNCTION"
	BUILTIN_OBJ      = "BUILTIN"
	ARRAY_OBJ        = "ARRAY"
	TUPLE_OBJ        = "TUPLE"
	HASH_OBJ         = "HASH"
)

Variables

View Source 
var (
	ERR_ARGUMENT     = "wrong number of arguments. expected=%d, got=%d"
	ERR_NOMETHOD     = "undefined method '%s' for object %s"
	ERR_INDEX        = "index error: '%d' out of range"
	ERR_KEY          = "key error: type %s is not hashable"
	ERR_PREFIXOP     = "unsupported operator for prefix expression:'%s' and type: %s"
	ERR_INFIXOP      = "unsupported operator for infix expression: %s '%s' %s"
	ERR_POSTFIXOP    = "unsupported operator for postfix expression:'%s' and type: %s"
	ERR_UNKNOWNIDENT = "unknown identifier: '%s' is not defined"
	ERR_DIVIDEBYZERO = "divide by zero"
	ERR_NOTFUNCTION  = "not a function: %s"
	ERR_PARAMTYPE    = "%s argument for '%s' should be type %s. got=%s"
	ERR_NOINDEXABLE  = "index error: type %s is not indexable"
)
View Source 
var (
	TRUE  = &Boolean{Bool: true}
	FALSE = &Boolean{Bool: false}
	NIL   = &Nil{}
)

Functions

func IsTrue 

func IsTrue(obj Object) bool

Types

type Array 

type Array struct {
	Members []Object
}

func (*Array) CallMethod 

func (a *Array) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Array) Inspect 

func (a *Array) Inspect() string

func (*Array) Type 

func (a *Array) Type() ObjectType

type Boolean 

type Boolean struct {
	Bool bool
}

func NewBooleanObj 

func NewBooleanObj(b bool) *Boolean

func (*Boolean) CallMethod 

func (b *Boolean) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Boolean) HashKey 

func (b *Boolean) HashKey() HashKey

func (*Boolean) Inspect 

func (b *Boolean) Inspect() string

func (*Boolean) Type 

func (b *Boolean) Type() ObjectType

type Builtin 

type Builtin struct {
	Fn BuiltinFunc
}

func (*Builtin) CallMethod 

func (b *Builtin) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Builtin) Inspect 

func (b *Builtin) Inspect() string

func (*Builtin) Type 

func (b *Builtin) Type() ObjectType

type BuiltinFunc 

type BuiltinFunc func(line string, scope *Scope, args ...Object) Object

type Error 

type Error struct {
	Message string
}

func (*Error) CallMethod 

func (e *Error) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Error) Inspect 

func (e *Error) Inspect() string

func (*Error) Type 

func (e *Error) Type() ObjectType

type Function 

type Function struct {
	Literal *ast.FunctionLiteral
	Scope   *Scope
}

func (*Function) CallMethod 

func (f *Function) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Function) Inspect 

func (f *Function) Inspect() string

func (*Function) Type 

func (f *Function) Type() ObjectType

type Hash 

type Hash struct {
	Pairs map[HashKey]HashPair
}

func NewHash 

func NewHash() *Hash

func (*Hash) CallMethod 

func (h *Hash) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Hash) Inspect 

func (h *Hash) Inspect() string

func (*Hash) Type 

func (h *Hash) Type() ObjectType

type HashKey 

type HashKey struct {
	Type  ObjectType
	Value uint64
}

type HashPair 

type HashPair struct {
	Key   Object
	Value Object
}

type Hashable 

type Hashable interface {
	HashKey() HashKey
}

type Nil 

type Nil struct {
}

func NewNil 

func NewNil(s string) *Nil

func (*Nil) CallMethod 

func (n *Nil) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Nil) Inspect 

func (n *Nil) Inspect() string

func (*Nil) Type 

func (n *Nil) Type() ObjectType

type Number 

type Number struct {
	Value float64
}

func NewNumber 

func NewNumber(f float64) *Number

func (*Number) CallMethod 

func (n *Number) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Number) HashKey 

func (n *Number) HashKey() HashKey

func (*Number) Inspect 

func (n *Number) Inspect() string

func (*Number) Type 

func (n *Number) Type() ObjectType

type Object 

type Object interface {
	Type() ObjectType
	Inspect() string
	CallMethod(line string, scope *Scope, method string, args ...Object) Object
}

func Eval 

func Eval(node ast.Node, scope *Scope) (val Object)

type ObjectType 

type ObjectType string

object

type ReturnValue 

type ReturnValue struct {
	Value Object
}

func (*ReturnValue) CallMethod 

func (rv *ReturnValue) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*ReturnValue) Inspect 

func (rv *ReturnValue) Inspect() string

func (*ReturnValue) Type 

func (rv *ReturnValue) Type() ObjectType

type Scope 

type Scope struct {
	Writer io.Writer
	// contains filtered or unexported fields
}

func NewScope 

func NewScope(p *Scope, w io.Writer) *Scope

func (*Scope) DebugPrint 

func (s *Scope) DebugPrint(indent string)

func (*Scope) Del 

func (s *Scope) Del(name string)

func (*Scope) Get 

func (s *Scope) Get(name string) (Object, bool)

func (*Scope) GetKeys 

func (s *Scope) GetKeys() []string

Get all the keys of the scope.

func (*Scope) Set 

func (s *Scope) Set(name string, val Object) Object

type String 

type String struct {
	String string
}

func NewString 

func NewString(s string) *String

func (*String) CallMethod 

func (s *String) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*String) HashKey 

func (s *String) HashKey() HashKey

func (*String) Inspect 

func (s *String) Inspect() string

func (*String) Type 

func (s *String) Type() ObjectType

type Tuple 

type Tuple struct {
	// Used in function return values.
	// if a function returns multiple values, they will wrap the results into a tuple,
	// the flag will be set to true
	IsMulti bool
	Members []Object
}

func (*Tuple) CallMethod 

func (t *Tuple) CallMethod(line string, scope *Scope, method string, args ...Object) Object

func (*Tuple) HashKey 

func (t *Tuple) HashKey() HashKey

func (*Tuple) Inspect 

func (t *Tuple) Inspect() string

func (*Tuple) Type 

func (t *Tuple) Type() ObjectType

Source Files

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