activations

Documentation

Index

• type Activation
  • func NewActivation[T any](memoryGauge common.MemoryGauge, parent *Activation[T]) *Activation[T]
  • func (a *Activation[T]) Find(name string) (_ T)
  • func (a *Activation[T]) FunctionValues() map[string]T
  • func (a *Activation[T]) Set(name string, value T)
• type Activations
  • func NewActivations[T any](memoryGauge common.MemoryGauge) *Activations[T]
  • func (a *Activations[T]) Current() *Activation[T]
  • func (a *Activations[T]) CurrentOrNew() *Activation[T]
  • func (a *Activations[T]) Depth() int
  • func (a *Activations[T]) Find(name string) (_ T)
  • func (a *Activations[T]) Pop()
  • func (a *Activations[T]) Push(activation *Activation[T])
  • func (a *Activations[T]) PushNewWithCurrent()
  • func (a *Activations[T]) PushNewWithParent(parent *Activation[T]) *Activation[T]
  • func (a *Activations[T]) Set(name string, value T)

Types

type Activation

type Activation[T any] struct {
	MemoryGauge common.MemoryGauge

	Parent     *Activation[T]
	Depth      int
	IsFunction bool
	// contains filtered or unexported fields
}

Activation is a map of strings to values. It can be used to represent an active scope in a program, i.e. it can be used as a symbol table during semantic analysis, or as an activation record during interpretation or compilation.

func NewActivation

func NewActivation[T any](memoryGauge common.MemoryGauge, parent *Activation[T]) *Activation[T]

func (*Activation[T]) Find

func (a *Activation[T]) Find(name string) (_ T)

Find returns the value for a given name in the activation. It returns nil if no value is found.

func (*Activation[T]) FunctionValues

func (a *Activation[T]) FunctionValues() map[string]T

FunctionValues returns all values in the current function activation.

func (*Activation[T]) Set

func (a *Activation[T]) Set(name string, value T)

Set sets the given name-value pair in the activation.

type Activations

type Activations[T any] struct {
	// contains filtered or unexported fields
}

Activations is a stack of activation records. Each entry represents a new activation record.

The current / most nested activation record can be found at the top of the stack (see function `Current`).

func NewActivations

func NewActivations[T any](memoryGauge common.MemoryGauge) *Activations[T]

func (*Activations[T]) Current

func (a *Activations[T]) Current() *Activation[T]

Current returns the current / most nested activation, which can be found at the top of the stack. It returns nil if there is no active activation.

func (*Activations[T]) CurrentOrNew

func (a *Activations[T]) CurrentOrNew() *Activation[T]

CurrentOrNew returns the current activation, or if it does not exist, a new activation

func (*Activations[T]) Depth

func (a *Activations[T]) Depth() int

Depth returns the depth (size) of the activation stack.

func (*Activations[T]) Find

func (a *Activations[T]) Find(name string) (_ T)

Find returns the value for a given key in the current activation. It returns nil if no value is found or if there is no current activation.

func (*Activations[T]) Pop

func (a *Activations[T]) Pop()

Pop pops the top-most (current) activation from the top of the activation stack.

func (*Activations[T]) Push

func (a *Activations[T]) Push(activation *Activation[T])

Push pushes the given activation onto the top of the activation stack.

func (*Activations[T]) PushNewWithCurrent

func (a *Activations[T]) PushNewWithCurrent()

PushNewWithCurrent pushes a new empty activation to the top of the activation stack. The new activation has the current activation as its parent.

func (*Activations[T]) PushNewWithParent

func (a *Activations[T]) PushNewWithParent(parent *Activation[T]) *Activation[T]

PushNewWithParent pushes a new empty activation to the top of the activation stack. The new activation has the given parent as its parent.

func (*Activations[T]) Set

func (a *Activations[T]) Set(name string, value T)

Set sets the name-value pair in the current scope.