use ast::Field;
use validation::{RuleError, ValidatorContext, Visitor};
use parser::Spanning;
pub struct ScalarLeafs {}
pub fn factory() -> ScalarLeafs {
ScalarLeafs {}
}
impl<'a> Visitor<'a> for ScalarLeafs {
fn enter_field(&mut self, ctx: &mut ValidatorContext<'a>, field: &'a Spanning<Field>) {
let field_name = &field.item.name.item;
let error = if let (Some(field_type), Some(field_type_literal)) =
(ctx.current_type(), ctx.current_type_literal())
{
match (field_type.is_leaf(), &field.item.selection_set) {
(true, &Some(_)) => Some(RuleError::new(
&no_allowed_error_message(field_name, &format!("{}", field_type_literal)),
&[field.start.clone()],
)),
(false, &None) => Some(RuleError::new(
&required_error_message(field_name, &format!("{}", field_type_literal)),
&[field.start.clone()],
)),
_ => None,
}
} else {
None
};
if let Some(error) = error {
ctx.append_errors(vec![error]);
}
}
}
fn no_allowed_error_message(field_name: &str, type_name: &str) -> String {
format!(
r#"Field "{}" must not have a selection since type {} has no subfields"#,
field_name,
type_name
)
}
fn required_error_message(field_name: &str, type_name: &str) -> String {
format!(
r#"Field "{}" of type "{}" must have a selection of subfields. Did you mean "{} {{ ... }}"?"#,
field_name, type_name, field_name)
}
#[cfg(test)]
mod tests {
use super::{factory, no_allowed_error_message, required_error_message};
use parser::SourcePosition;
use validation::{expect_fails_rule, expect_passes_rule, RuleError};
#[test]
fn valid_scalar_selection() {
expect_passes_rule(
factory,
r#"
fragment scalarSelection on Dog {
barks
}
"#,
);
}
#[test]
fn object_type_missing_selection() {
expect_fails_rule(
factory,
r#"
query directQueryOnObjectWithoutSubFields {
human
}
"#,
&[
RuleError::new(
&required_error_message("human", "Human"),
&[SourcePosition::new(67, 2, 12)],
),
],
);
}
#[test]
fn interface_type_missing_selection() {
expect_fails_rule(
factory,
r#"
{
human { pets }
}
"#,
&[
RuleError::new(
&required_error_message("pets", "[Pet]"),
&[SourcePosition::new(33, 2, 20)],
),
],
);
}
#[test]
fn valid_scalar_selection_with_args() {
expect_passes_rule(
factory,
r#"
fragment scalarSelectionWithArgs on Dog {
doesKnowCommand(dogCommand: SIT)
}
"#,
);
}
#[test]
fn scalar_selection_not_allowed_on_boolean() {
expect_fails_rule(
factory,
r#"
fragment scalarSelectionsNotAllowedOnBoolean on Dog {
barks { sinceWhen }
}
"#,
&[
RuleError::new(
&no_allowed_error_message("barks", "Boolean"),
&[SourcePosition::new(77, 2, 12)],
),
],
);
}
#[test]
fn scalar_selection_not_allowed_on_enum() {
expect_fails_rule(
factory,
r#"
fragment scalarSelectionsNotAllowedOnEnum on Cat {
furColor { inHexdec }
}
"#,
&[
RuleError::new(
&no_allowed_error_message("furColor", "FurColor"),
&[SourcePosition::new(74, 2, 12)],
),
],
);
}
#[test]
fn scalar_selection_not_allowed_with_args() {
expect_fails_rule(
factory,
r#"
fragment scalarSelectionsNotAllowedWithArgs on Dog {
doesKnowCommand(dogCommand: SIT) { sinceWhen }
}
"#,
&[
RuleError::new(
&no_allowed_error_message("doesKnowCommand", "Boolean"),
&[SourcePosition::new(76, 2, 12)],
),
],
);
}
#[test]
fn scalar_selection_not_allowed_with_directives() {
expect_fails_rule(
factory,
r#"
fragment scalarSelectionsNotAllowedWithDirectives on Dog {
name @include(if: true) { isAlsoHumanName }
}
"#,
&[
RuleError::new(
&no_allowed_error_message("name", "String"),
&[SourcePosition::new(82, 2, 12)],
),
],
);
}
#[test]
fn scalar_selection_not_allowed_with_directives_and_args() {
expect_fails_rule(
factory,
r#"
fragment scalarSelectionsNotAllowedWithDirectivesAndArgs on Dog {
doesKnowCommand(dogCommand: SIT) @include(if: true) { sinceWhen }
}
"#,
&[
RuleError::new(
&no_allowed_error_message("doesKnowCommand", "Boolean"),
&[SourcePosition::new(89, 2, 12)],
),
],
);
}
}