57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
use crate::validation::context::ValidatorContext;
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use crate::validation::visitor::Visitor;
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use graphql_parser::query::{OperationDefinition, VariableDefinition};
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use graphql_parser::schema::Value;
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use graphql_parser::Pos;
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use std::collections::HashSet;
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#[derive(Default)]
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pub struct NoUnusedVariables<'a> {
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vars: HashSet<(&'a str, Pos)>,
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used_vars: HashSet<&'a str>,
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}
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impl<'a> Visitor<'a> for NoUnusedVariables<'a> {
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fn enter_operation_definition(
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&mut self,
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_ctx: &mut ValidatorContext<'a>,
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_operation_definition: &'a OperationDefinition,
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) {
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self.used_vars.clear();
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self.vars.clear();
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}
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fn exit_operation_definition(
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&mut self,
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ctx: &mut ValidatorContext<'a>,
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_operation_definition: &'a OperationDefinition,
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) {
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for (name, pos) in &self.vars {
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if !self.used_vars.contains(name) {
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ctx.report_error(vec![*pos], format!("Variable \"${}\" is not used", name));
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}
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}
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}
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fn enter_variable_definition(
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&mut self,
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_ctx: &mut ValidatorContext<'a>,
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variable_definition: &'a VariableDefinition,
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) {
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self.vars
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.insert((&variable_definition.name, variable_definition.position));
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}
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fn enter_argument(
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&mut self,
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_ctx: &mut ValidatorContext<'a>,
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_pos: Pos,
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_name: &'a str,
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value: &'a Value,
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) {
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if let Value::Variable(var) = value {
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self.used_vars.insert(var);
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}
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}
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}
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