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factor out @refetchable directive parsing
Reviewed By: alunyov Differential Revision: D27631808 fbshipit-source-id: 1dca51aae835fadeb6ec19333353201e80bba89b
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compiler/crates/relay-transforms/src/refetchable_fragment/refetchable_directive.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
|
|
||
| use common::{Diagnostic, DiagnosticsResult, NamedItem, WithLocation}; | ||
| use graphql_ir::{Directive, ValidationMessage}; | ||
| use graphql_text_printer::print_value; | ||
| use interner::{Intern, StringKey}; | ||
| use lazy_static::lazy_static; | ||
| use schema::SDLSchema; | ||
|
|
||
| lazy_static! { | ||
| static ref REFETCHABLE_NAME: StringKey = "refetchable".intern(); | ||
| static ref QUERY_NAME_ARG: StringKey = "queryName".intern(); | ||
| } | ||
|
|
||
| /// Represents the @refetchable Relay directive: | ||
| /// | ||
| /// ```graphql | ||
| /// directive @refetchable( | ||
| /// queryName: String! | ||
| /// ) on FRAGMENT_DEFINITION | ||
| /// ``` | ||
| pub struct RefetchableDirective { | ||
| pub query_name: WithLocation<StringKey>, | ||
| } | ||
|
|
||
| impl RefetchableDirective { | ||
| pub fn from_directives( | ||
| schema: &SDLSchema, | ||
| directives: &[Directive], | ||
| ) -> DiagnosticsResult<Option<Self>> { | ||
| if let Some(directive) = directives.named(*REFETCHABLE_NAME) { | ||
| Ok(Some(Self::from_directive(schema, directive)?)) | ||
| } else { | ||
| Ok(None) | ||
| } | ||
| } | ||
|
|
||
| fn from_directive(schema: &SDLSchema, directive: &Directive) -> DiagnosticsResult<Self> { | ||
| let mut name = None; | ||
| for argument in &directive.arguments { | ||
| if argument.name.item == *QUERY_NAME_ARG { | ||
| if let Some(query_name) = argument.value.item.get_string_literal() { | ||
| name = Some(WithLocation::new(argument.value.location, query_name)); | ||
| } else { | ||
| return Err(vec![Diagnostic::error( | ||
| ValidationMessage::ExpectQueryNameToBeString { | ||
| query_name_value: print_value(schema, &argument.value.item), | ||
| }, | ||
| argument.name.location, | ||
| )]); | ||
| } | ||
| } else { | ||
| // should be validated by general directive validations | ||
| panic!( | ||
| "Unexpected name on @refetchable query: `{}`", | ||
| argument.name.item | ||
| ) | ||
| } | ||
| } | ||
| Ok(Self { | ||
| query_name: name.unwrap(), | ||
| }) | ||
| } | ||
| } |
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