51 lines
1.3 KiB
Rust
51 lines
1.3 KiB
Rust
use crate::{QueryError, GQLType, Result};
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use graphql_parser::query::Value;
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#[doc(hidden)]
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pub struct GQLEnumItem<T> {
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pub name: &'static str,
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pub desc: Option<&'static str>,
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pub value: T,
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}
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#[doc(hidden)]
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#[async_trait::async_trait]
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pub trait GQLEnum: GQLType + Sized + Eq + Send + Copy + Sized + 'static {
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fn items() -> &'static [GQLEnumItem<Self>];
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fn parse_enum(value: Value) -> Result<Self> {
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match value {
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Value::Enum(s) => {
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let items = Self::items();
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for item in items {
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if item.name == s {
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return Ok(item.value);
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}
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}
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Err(QueryError::InvalidEnumValue {
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enum_type: Self::type_name(),
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value: s,
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}
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.into())
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}
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_ => {
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return Err(QueryError::ExpectedType {
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expect: Self::type_name(),
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actual: value,
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}
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.into())
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}
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}
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}
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fn resolve_enum(self) -> Result<serde_json::Value> {
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let items = Self::items();
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for item in items {
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if item.value == self {
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return Ok(item.name.clone().into());
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}
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}
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unreachable!()
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}
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}
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