Enum HostContext 

pub enum HostContext {
    None,
    Unresolved,
    WithRules(Arc<Vec<PathMappingRule>>),
}

Host-context state available to expression evaluation.

Host-context functions (today: apply_path_mapping) need host-supplied state that the evaluator has no knowledge of. This enum expresses the three possible states of host availability in a single type, replacing the previous split between FunctionLibrary::with_host_context and FunctionLibrary::with_unresolved_host_context.

Variants

None

No host-context functions are registered. Default.

Unresolved

Host-context function signatures are registered with stub implementations that return Unresolved(T). Use this at template-validation time, when real host state is not yet available but signatures must be known for type checking.

WithRules(Arc<Vec<PathMappingRule>>)

Host-context functions are registered with implementations that use the supplied path mapping rules. Use this at runtime.

Rules are shared via Arc so cloning a library is cheap.

Implementations

impl HostContext

pub fn with_rules(rules: Vec<PathMappingRule>) -> Self

Convenience constructor: take ownership of a Vec<PathMappingRule> and wrap it in an Arc.

pub fn is_enabled(&self) -> bool

Whether this host context registers any host-context functions.

pub fn is_unresolved(&self) -> bool

Whether this host context uses unresolved stub implementations.

Trait Implementations

impl Clone for HostContext

fn clone(&self) -> HostContext

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HostContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for HostContext

fn default() -> HostContext

Returns the “default value” for a type.