Trait Language 

pub trait Language: Send + Sync {
    // Required methods
    fn name(&self) -> &'static str;
    fn create_expression(
        &self,
        script: &str,
    ) -> Result<Box<dyn Expression>, LanguageError>;
    fn create_predicate(
        &self,
        script: &str,
    ) -> Result<Box<dyn Predicate>, LanguageError>;

    // Provided methods
    fn create_predicate_group(
        &self,
        scripts: &[&str],
    ) -> Result<Option<Box<dyn PredicateGroup>>, LanguageError> { ... }
    fn create_mutating_expression(
        &self,
        _script: &str,
    ) -> Result<Box<dyn MutatingExpression>, LanguageError> { ... }
    fn create_mutating_predicate(
        &self,
        _script: &str,
    ) -> Result<Box<dyn MutatingPredicate>, LanguageError> { ... }
}

A Language factory: produces Expression and Predicate objects.

Required Methods

fn name(&self) -> &'static str

fn create_expression( &self, script: &str, ) -> Result<Box<dyn Expression>, LanguageError>

fn create_predicate( &self, script: &str, ) -> Result<Box<dyn Predicate>, LanguageError>

Provided Methods

fn create_predicate_group( &self, scripts: &[&str], ) -> Result<Option<Box<dyn PredicateGroup>>, LanguageError>

Create a group of predicates that can be evaluated in one engine call.

The default returns Ok(None), meaning group evaluation is not supported by this language; callers fall back to per-clause sequential evaluation.

fn create_mutating_expression( &self, _script: &str, ) -> Result<Box<dyn MutatingExpression>, LanguageError>

Create a mutating expression. Default returns NotSupported.

fn create_mutating_predicate( &self, _script: &str, ) -> Result<Box<dyn MutatingPredicate>, LanguageError>

Create a mutating predicate. Default returns NotSupported.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors