activations

Documentation

Index

• type ValueType
• type ValueTypeActivation
  • func NewValueTypeActivation(parent *ValueTypeActivation) *ValueTypeActivation
  • func (a *ValueTypeActivation) Find(name string) ValueType
  • func (a *ValueTypeActivation) Set(name string, value ValueType)
• type ValueTypeActivations
  • func (a *ValueTypeActivations) Current() *ValueTypeActivation
  • func (a *ValueTypeActivations) CurrentOrNew() *ValueTypeActivation
  • func (a *ValueTypeActivations) Depth() int
  • func (a *ValueTypeActivations) Find(name string) ValueType
  • func (a *ValueTypeActivations) Pop()
  • func (a *ValueTypeActivations) Push(activation *ValueTypeActivation)
  • func (a *ValueTypeActivations) PushNewWithCurrent()
  • func (a *ValueTypeActivations) PushNewWithParent(parent *ValueTypeActivation) *ValueTypeActivation
  • func (a *ValueTypeActivations) Set(name string, value ValueType)

Types

type ValueType

type ValueType generic.Type

type ValueTypeActivation

type ValueTypeActivation struct {
	Depth  int
	Parent *ValueTypeActivation
	// contains filtered or unexported fields
}

A ValueTypeActivation 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 NewValueTypeActivation

func NewValueTypeActivation(parent *ValueTypeActivation) *ValueTypeActivation

func (*ValueTypeActivation) Find

func (a *ValueTypeActivation) Find(name string) ValueType

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

func (*ValueTypeActivation) Set

func (a *ValueTypeActivation) Set(name string, value ValueType)

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

type ValueTypeActivations

type ValueTypeActivations 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 (*ValueTypeActivations) Current

func (a *ValueTypeActivations) Current() *ValueTypeActivation

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 (*ValueTypeActivations) CurrentOrNew

func (a *ValueTypeActivations) CurrentOrNew() *ValueTypeActivation

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

func (*ValueTypeActivations) Depth

func (a *ValueTypeActivations) Depth() int

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

func (*ValueTypeActivations) Find

func (a *ValueTypeActivations) Find(name string) ValueType

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 (*ValueTypeActivations) Pop

func (a *ValueTypeActivations) Pop()

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

func (*ValueTypeActivations) Push

func (a *ValueTypeActivations) Push(activation *ValueTypeActivation)

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

func (*ValueTypeActivations) PushNewWithCurrent

func (a *ValueTypeActivations) 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 (*ValueTypeActivations) PushNewWithParent

func (a *ValueTypeActivations) PushNewWithParent(parent *ValueTypeActivation) *ValueTypeActivation

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

func (*ValueTypeActivations) Set

func (a *ValueTypeActivations) Set(name string, value ValueType)

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