Single[S: (Any #read & Equatable[S]), optional D: Any #share, optional V: Any #share]

[Source]

Matches a single item. If given a list of possibilities, will only succeed if it matches one of them. Otherwise, it succeeds for any single item.

class ref Single[S: (Any #read & Equatable[S]), optional D: Any #share, optional V: Any #share] is
  RuleNode[S, D, V] ref

Implements

• RuleNode[S, D, V] ref

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Constructors

create

[Source]

new ref create(
  expected': ReadSeq[S] val = array,
  action': (Action[S, D, V] val | None val) = reference)
: Single[S, D, V] ref^

Parameters

• expected': ReadSeq[S] val = array
• action': (Action[S, D, V] val | None val) = reference

Returns

• Single[S, D, V] ref^

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Public Functions

action

[Source]

fun box action()
: (Action[S, D, V] val | None val)

Returns

• (Action[S, D, V] val | None val)

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call

[Source]

fun box call(
  depth: USize val,
  loc: Loc[S] val)
: (_BindFrame[S, D, V] ref | _CondFrame[S, D, V] ref | _ConjFrame[S, D, V] ref | 
    _DisjFrame[S, D, V] ref | _ErrorFrame[S, D, V] ref | _LiteralFrame[S, D, V] ref | 
    _LookFrame[S, D, V] ref | _NamedRuleFrame[S, D, V] ref | _NegFrame[S, D, V] ref | 
    _SingleFrame[S, D, V] ref | _StarFrame[S, D, V] ref)

Parameters

• depth: USize val
• loc: Loc[S] val

Returns

• (_BindFrame[S, D, V] ref | _CondFrame[S, D, V] ref | _ConjFrame[S, D, V] ref | _DisjFrame[S, D, V] ref | _ErrorFrame[S, D, V] ref | _LiteralFrame[S, D, V] ref | _LookFrame[S, D, V] ref | _NamedRuleFrame[S, D, V] ref | _NegFrame[S, D, V] ref | _SingleFrame[S, D, V] ref | _StarFrame[S, D, V] ref)

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