EvalContext

Struct EvalContext 

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pub struct EvalContext<'a> { /* private fields */ }
Expand description

Evaluation context that includes resolver and optional built-ins registry

This is the low-level evaluation context used internally. Most users should use FactsEvalContext and the evaluate() function instead.

§Examples

use hel::{EvalContext, HelResolver, Value};

struct MyResolver;
impl HelResolver for MyResolver {
    fn resolve_attr(&self, object: &str, field: &str) -> Option<Value> {
        match (object, field) {
            ("binary", "arch") => Some(Value::String("x86_64".into())),
            _ => None,
        }
    }
}

let resolver = MyResolver;
let ctx = EvalContext::new(&resolver);

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impl<'a> EvalContext<'a>

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pub fn new(resolver: &'a dyn HelResolver) -> Self

Create a context with just a resolver (no built-ins)

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pub fn with_builtins( resolver: &'a dyn HelResolver, builtins: &'a BuiltinsRegistry, ) -> Self

Create a context with both resolver and built-ins registry

Auto Trait Implementations§

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impl<'a> Freeze for EvalContext<'a>

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impl<'a> !RefUnwindSafe for EvalContext<'a>

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impl<'a> !Send for EvalContext<'a>

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impl<'a> !Sync for EvalContext<'a>

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impl<'a> Unpin for EvalContext<'a>

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impl<'a> !UnwindSafe for EvalContext<'a>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.