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use crate::ast::{
    Directive, Document, Field, Fragment, FragmentSpread, InlineFragment, InputValue, Operation,
    Selection, VariableDefinition,
};
use crate::parser::Spanning;
use crate::validation::ValidatorContext;
use crate::value::ScalarValue;

#[doc(hidden)]
pub trait Visitor<'a, S>
where
    S: ScalarValue,
{
    fn enter_document(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Document<S>) {}
    fn exit_document(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Document<S>) {}

    fn enter_operation_definition(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<Operation<S>>,
    ) {
    }
    fn exit_operation_definition(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<Operation<S>>,
    ) {
    }

    fn enter_fragment_definition(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<Fragment<S>>,
    ) {
    }
    fn exit_fragment_definition(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<Fragment<S>>,
    ) {
    }

    fn enter_variable_definition(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a (Spanning<&'a str>, VariableDefinition<S>),
    ) {
    }
    fn exit_variable_definition(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a (Spanning<&'a str>, VariableDefinition<S>),
    ) {
    }

    fn enter_directive(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Spanning<Directive<S>>) {}
    fn exit_directive(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Spanning<Directive<S>>) {}

    fn enter_argument(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a (Spanning<&'a str>, Spanning<InputValue<S>>),
    ) {
    }
    fn exit_argument(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a (Spanning<&'a str>, Spanning<InputValue<S>>),
    ) {
    }

    fn enter_selection_set(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Vec<Selection<S>>) {}
    fn exit_selection_set(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Vec<Selection<S>>) {}

    fn enter_field(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Spanning<Field<S>>) {}
    fn exit_field(&mut self, _: &mut ValidatorContext<'a, S>, _: &'a Spanning<Field<S>>) {}

    fn enter_fragment_spread(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<FragmentSpread<S>>,
    ) {
    }
    fn exit_fragment_spread(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<FragmentSpread<S>>,
    ) {
    }

    fn enter_inline_fragment(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<InlineFragment<S>>,
    ) {
    }
    fn exit_inline_fragment(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a Spanning<InlineFragment<S>>,
    ) {
    }

    fn enter_null_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<()>) {}
    fn exit_null_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<()>) {}

    fn enter_scalar_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<&'a S>) {}
    fn exit_scalar_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<&'a S>) {}

    fn enter_enum_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<&'a String>) {}
    fn exit_enum_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<&'a String>) {}

    fn enter_variable_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<&'a String>) {}
    fn exit_variable_value(&mut self, _: &mut ValidatorContext<'a, S>, _: Spanning<&'a String>) {}

    fn enter_list_value(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: Spanning<&'a Vec<Spanning<InputValue<S>>>>,
    ) {
    }
    fn exit_list_value(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: Spanning<&'a Vec<Spanning<InputValue<S>>>>,
    ) {
    }

    fn enter_object_value(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: Spanning<&'a Vec<(Spanning<String>, Spanning<InputValue<S>>)>>,
    ) {
    }
    fn exit_object_value(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: Spanning<&'a Vec<(Spanning<String>, Spanning<InputValue<S>>)>>,
    ) {
    }

    fn enter_object_field(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a (Spanning<String>, Spanning<InputValue<S>>),
    ) {
    }
    fn exit_object_field(
        &mut self,
        _: &mut ValidatorContext<'a, S>,
        _: &'a (Spanning<String>, Spanning<InputValue<S>>),
    ) {
    }
}