rhaj/_archive/rhai_engine/rhaibook/engine/eval-context.md

EvalContext

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Many functions in advanced APIs contain a parameter of type EvalContext in order to allow the current evaluation state to be accessed and/or modified.

EvalContext encapsulates the current evaluation context and exposes the following methods.

Method	Return type	Description
scope()	[&Scope][Scope]	reference to the current [Scope]
scope_mut()	[&mut Scope][Scope]	mutable reference to the current [Scope]; [variables] can be added to/removed from it
engine()	[&Engine][Engine]	reference to the current [Engine]
source()	Option<&str>	reference to the current source, if any
tag()	[&Dynamic][Dynamic]	reference to the custom state that is persistent during the current run
tag_mut()	[&mut Dynamic][Dynamic]	mutable reference to the custom state that is persistent during the current run
iter_imports()	impl Iterator<Item = (&str,[&Module][Module])>	iterator of the current stack of [modules] imported via [import] statements, in reverse order (i.e. later [modules] come first); not available under [no_module]
global_runtime_state()	[&GlobalRuntimeState][GlobalRuntimeState]	reference to the current [global runtime state][GlobalRuntimeState] (including the stack of [modules] imported via [import] statements)
global_runtime_state_mut()	[&mut &mut GlobalRuntimeState][GlobalRuntimeState]	mutable reference to the current [global runtime state][GlobalRuntimeState]; use this to access the [debugger][debugger] field in order to set/clear [break-points]
iter_namespaces()	impl Iterator<Item =[&Module][Module]>	iterator of the [namespaces][function namespaces] (as [modules]) containing all script-defined [functions], in reverse order (i.e. later [modules] come first)
namespaces()	[&[&Module]][Module]	reference to the [namespaces][function namespaces] (as [modules]) containing all script-defined [functions]
this_ptr()	[Option<&Dynamic>][Dynamic]	reference to the current bound this pointer, if any
this_ptr_mut()	[&mut Option<&mut Dynamic>][Dynamic]	mutable reference to the current bound this pointer, if any
call_level()	usize	the current nesting level of [function] calls