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use crate::parser::query::FragmentDefinition;
use crate::validation::visitor::{Visitor, VisitorContext};
use crate::Positioned;
use std::collections::HashSet;
#[derive(Default)]
pub struct UniqueFragmentNames<'a> {
names: HashSet<&'a str>,
}
impl<'a> Visitor<'a> for UniqueFragmentNames<'a> {
fn enter_fragment_definition(
&mut self,
ctx: &mut VisitorContext<'a>,
fragment_definition: &'a Positioned<FragmentDefinition>,
) {
if !self.names.insert(&fragment_definition.name) {
ctx.report_error(
vec![fragment_definition.position()],
format!(
"There can only be one fragment named \"{}\"",
fragment_definition.name
),
)
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{expect_fails_rule, expect_passes_rule};
pub fn factory<'a>() -> UniqueFragmentNames<'a> {
UniqueFragmentNames::default()
}
#[test]
fn no_fragments() {
expect_passes_rule!(
factory,
r#"
{
dog {
name
}
}
"#,
);
}
#[test]
fn one_fragment() {
expect_passes_rule!(
factory,
r#"
{
dog {
...fragA
}
}
fragment fragA on Dog {
name
}
"#,
);
}
#[test]
fn many_fragments() {
expect_passes_rule!(
factory,
r#"
{
dog {
...fragA
...fragB
...fragC
}
}
fragment fragA on Dog {
name
}
fragment fragB on Dog {
nickname
}
fragment fragC on Dog {
barkVolume
}
"#,
);
}
#[test]
fn inline_fragments_always_unique() {
expect_passes_rule!(
factory,
r#"
{
dorOrHuman {
...on Dog {
name
}
...on Dog {
barkVolume
}
}
}
"#,
);
}
#[test]
fn fragment_and_operation_named_the_same() {
expect_passes_rule!(
factory,
r#"
query Foo {
dog {
...Foo
}
}
fragment Foo on Dog {
name
}
"#,
);
}
#[test]
fn fragments_named_the_same() {
expect_fails_rule!(
factory,
r#"
{
dog {
...fragA
}
}
fragment fragA on Dog {
name
}
fragment fragA on Dog {
barkVolume
}
"#,
);
}
#[test]
fn fragments_named_the_same_no_reference() {
expect_fails_rule!(
factory,
r#"
fragment fragA on Dog {
name
}
fragment fragA on Dog {
barkVolume
}
"#,
);
}
}