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package validator
import (
"github.com/vektah/gqlparser/v2/ast"
//nolint:revive // Validator rules each use dot imports for convenience.
. "github.com/vektah/gqlparser/v2/validator"
)
func init() {
AddRule("UniqueVariableNames", func(observers *Events, addError AddErrFunc) {
observers.OnOperation(func(walker *Walker, operation *ast.OperationDefinition) {
seen := map[string]int{}
for _, def := range operation.VariableDefinitions {
// add the same error only once per a variable.
if seen[def.Variable] == 1 {
addError(
Message(`There can be only one variable named "$%s".`, def.Variable),
At(def.Position),
)
}
seen[def.Variable]++
}
})
})
}
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