42817a3aa6
Implement InputValueType/OutputValueType for HashSet<T>/BTreeSet<T>/VecDeque<T>/LinkedList<T> Implement ScalarType for char/NonZero*/HashMap<String,T>/BTreeMap<String, T>
36 lines
1.2 KiB
Rust
36 lines
1.2 KiB
Rust
use crate::{GQLScalar, InputValueError, InputValueResult, ScalarType, Value};
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/// The `Char` scalar type represents a unicode char.
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/// The input and output values are a string, and there can only be one unicode character in this string.
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#[GQLScalar(internal)]
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impl ScalarType for char {
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fn parse(value: Value) -> InputValueResult<Self> {
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match value {
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Value::String(s) => {
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let mut chars = s.chars();
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match chars.next() {
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Some(ch) if chars.next() == None => Ok(ch),
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Some(_) => Err(InputValueError::Custom(
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"There can only be one unicode character in the string.".into(),
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)),
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None => Err(InputValueError::Custom(
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"A unicode character is required.".into(),
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)),
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}
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}
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_ => Err(InputValueError::ExpectedType(value)),
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}
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}
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fn is_valid(value: &Value) -> bool {
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match value {
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Value::String(_) => true,
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_ => false,
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}
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}
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fn to_value(&self) -> Value {
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Value::String((*self).into())
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}
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}
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