GraphQL v0.2.0 GraphQL.Lang.AST.Visitor protocol
Implementations of Visitor are used by the ASTReducer to transform a GraphQL AST into an arbitrary value.
The value can be the result of validations, or a transformation of the AST into a new AST, for example.
The fallback implementations of ‘enter’ and ‘leave’ return the accumulator untouched.
Summary
Types
t :: term
Functions
Called when entering a node of the AST.
The return value should be:
{next_action, acc}
where next_action is either :break or :continue and acc is the new value of the accumulator.
:break will abort the visitor and AST traversal will cease returning the current value of the accumulator.
Called when leaving a node of the AST.
The return value should be:
{next_action, acc}
where next_action is either :break or :continue and acc is the new value of the accumulator.
:break will abort the visitor and AST traversal will cease returning the current value of the accumulator.