constraints

func (*Optional) Activate ¶

func (c *Optional) Activate()

Activate activates this token

func (*Optional) Clone ¶

func (c *Optional) Clone() token.Token

Clone returns a copy of the token and all its children

func (*Optional) Deactivate ¶

func (c *Optional) Deactivate()

Deactivate deactivates this token

func (*Optional) Get ¶

func (c *Optional) Get() token.Token

Get returns the current referenced token

func (*Optional) InternalGet ¶

func (c *Optional) InternalGet() token.Token

InternalGet returns the current referenced internal token

func (*Optional) InternalLogicalRemove ¶

func (c *Optional) InternalLogicalRemove(tok token.Token) token.Token

InternalLogicalRemove removes the referenced internal token and returns the replacement for the current token or nil if the current token should be removed.

func (*Optional) InternalReplace ¶

func (c *Optional) InternalReplace(oldToken, newToken token.Token) error

InternalReplace replaces an old with a new internal token if it is referenced by this token. The error return argument is not nil, if the replacement is not suitable.

func (*Optional) IsOptional ¶

func (c *Optional) IsOptional() bool

IsOptional checks dynamically if this token is in the current state optional

func (*Optional) Parse ¶

func (c *Optional) Parse(pars *token.InternalParser, cur int) (int, []error)

Parse tries to parse the token beginning from the current position in the parser data. If the parsing is successful the error argument is nil and the next current position after the token is returned.

func (*Optional) Permutation ¶

func (c *Optional) Permutation(i uint) error

Permutation sets a specific permutation for this token

func (*Optional) Permutations ¶

func (c *Optional) Permutations() uint

Permutations returns the number of permutations for this token

func (*Optional) PermutationsAll ¶

func (c *Optional) PermutationsAll() uint

PermutationsAll returns the number of all possible permutations for this token including its children

func (*Optional) Reduce ¶

func (c *Optional) Reduce(i uint) error

Reduce sets a specific reduction for this token

func (*Optional) Reduces ¶

func (c *Optional) Reduces() uint

Reduces returns the number of reductions for this token

func (*Optional) String ¶

func (c *Optional) String() string