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runtime/src/main/java/ortus/boxlang/runtime/context/ClosureBoxContext.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| package ortus.boxlang.runtime.context; | ||
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| import ortus.boxlang.runtime.scopes.ArgumentsScope; | ||
| import ortus.boxlang.runtime.scopes.IScope; | ||
| import ortus.boxlang.runtime.scopes.Key; | ||
| import ortus.boxlang.runtime.types.Closure; | ||
| import ortus.boxlang.runtime.types.Struct; | ||
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| /** | ||
| * This context represents the execution of a closure. Closures are a simpler form of a Function which, | ||
| * unlike UDFs, do not track things like return type, output, etc. Closures also retain a reference to | ||
| * context in which they were created, which allows for lexical scoping. | ||
| */ | ||
| public class ClosureBoxContext extends FunctionBoxContext { | ||
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| /** | ||
| * Creates a new execution context with a bounded function instance and parent context | ||
| * | ||
| * @param parent The parent context | ||
| * @param function The Closure being invoked with this context | ||
| */ | ||
| public ClosureBoxContext( IBoxContext parent, Closure function ) { | ||
| this( parent, function, new ArgumentsScope() ); | ||
| } | ||
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| /** | ||
| * Creates a new execution context with a bounded function instance and parent context and arguments scope | ||
| * | ||
| * @param parent The parent context | ||
| * @param function The Closure being invoked with this context | ||
| * @param argumentsScope The arguments scope for this context | ||
| */ | ||
| public ClosureBoxContext( IBoxContext parent, Closure function, ArgumentsScope argumentsScope ) { | ||
| super( parent, function, argumentsScope ); | ||
| if ( parent == null ) { | ||
| throw new IllegalArgumentException( "Parent context cannot be null for ClosureBoxContext" ); | ||
| } | ||
| } | ||
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| /** | ||
| * Search for a variable in "nearby" scopes | ||
| */ | ||
| public ScopeSearchResult scopeFindNearby( Key key, IScope defaultScope, boolean shallow ) { | ||
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| Object result = localScope.getRaw( key ); | ||
| // Null means not found | ||
| if ( result != null ) { | ||
| // Unwrap the value now in case it was really actually null for real | ||
| return new ScopeSearchResult( localScope, Struct.unWrapNull( result ) ); | ||
| } | ||
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| result = argumentsScope.getRaw( key ); | ||
| // Null means not found | ||
| if ( result != null ) { | ||
| // Unwrap the value now in case it was really actually null for real | ||
| return new ScopeSearchResult( argumentsScope, Struct.unWrapNull( result ) ); | ||
| } | ||
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| // After a closure has checked local and arguments, it stops to do a shallow lookup in the declaring scope. If the declaring scope | ||
| // is also a CLosureBoxContext, it will do the same thing, and so on until it finds a non-ClosureBoxContext. | ||
| ScopeSearchResult declaringContextResult = getFunction().getDeclaringContext().scopeFindNearby( key, defaultScope, true ); | ||
| if ( declaringContextResult != null ) { | ||
| return declaringContextResult; | ||
| } | ||
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| // Shallow lookups don't defer to the parent | ||
| if ( shallow ) { | ||
| return null; | ||
| } | ||
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| // Now we pick up where we left off at the original closure context's parent. | ||
| // A UDF is "transparent" and can see everything in the parent scope as a "local" observer, so we call scopeFindNearby() on the parent | ||
| return parent.scopeFindNearby( key, defaultScope ); | ||
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| } | ||
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| // scopeFind(), getScope() and getScopeNearby() do not need to be overridden, as the closure's declaring context does not affect specific scope | ||
| // lookups | ||
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| /** | ||
| * Returns the function being invoked with this context, cast as a Closure | ||
| */ | ||
| @Override | ||
| public Closure getFunction() { | ||
| return ( Closure ) function; | ||
| } | ||
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| } |
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