edu.vub.at.objects.natives.grammar
Class AGUnquoteSplice

java.lang.Object
  edu.vub.at.objects.natives.NATNil
      edu.vub.at.objects.natives.NATByCopy
          edu.vub.at.objects.natives.grammar.NATAbstractGrammar
              edu.vub.at.objects.natives.grammar.AGExpression
                  edu.vub.at.objects.natives.grammar.AGUnquoteSplice

All Implemented Interfaces:

ATAbstractGrammar, ATConversions, ATExpression, ATNil, ATObject, ATStatement, ATUnquoteSplice, java.io.Serializable

public class AGUnquoteSplice

extends AGExpression

implements ATUnquoteSplice

Author:

tvc The native implementation of an unquote-splice AG element.

See Also:

Serialized Form

Field Summary

private ATExpression

uqsExp_

Fields inherited from class edu.vub.at.objects.natives.NATNil

_INSTANCE_

Constructor Summary

AGUnquoteSplice(ATExpression exp)

Method Summary

ATUnquoteSplice	base_asUnquoteSplice()
ATExpression	base_getExpression()
boolean	base_isUnquoteSplice()
ATObject	meta_eval(ATContext ctx) An unquotation cannot be evaluated, but rather gives rise to an XIllegalUnquote exception.
NATText	meta_print() Prints out the object in a human-readable way.
ATObject	meta_quote(ATContext ctx) Quoting a spliced unquotation means evaluating its contained expression, and returning its value as the result of the quote.

Methods inherited from class edu.vub.at.objects.natives.grammar.AGExpression

base_asExpression, meta_getStripes

Methods inherited from class edu.vub.at.objects.natives.NATByCopy

meta_pass, meta_resolve

Methods inherited from class edu.vub.at.objects.natives.NATNil

asAmbientTalkObject, asJavaClassUnderSymbiosis, asJavaObjectUnderSymbiosis, asNativeBoolean, asNativeException, asNativeFarReference, asNativeFraction, asNativeNumber, asNativeNumeric, asNativeTable, asNativeText, base__opeql__opeql_, base_asActorMirror, base_asAsyncMessage, base_asBegin, base_asBoolean, base_asClosure, base_asDefinition, base_asFarReference, base_asField, base_asHandler, base_asMessage, base_asMessageCreation, base_asMethod, base_asMirror, base_asNumber, base_asSplice, base_asStatement, base_asStripe, base_asSymbol, base_asTable, base_asVariableAssignment, base_init, base_isBoolean, base_isCallFrame, base_isClosure, base_isFarReference, base_isMessageCreation, base_isMethod, base_isMirror, base_isSplice, base_isStripe, base_isSymbol, base_isTable, base_isVariableAssignment, base_new, createChild, equals, isAmbientTalkObject, isJavaObjectUnderSymbiosis, isNativeBoolean, isNativeField, isNativeText, meta_addField, meta_addMethod, meta_assignField, meta_assignVariable, meta_clone, meta_defineField, meta_doesNotUnderstand, meta_extend, meta_getDynamicParent, meta_getLexicalParent, meta_grabField, meta_grabMethod, meta_invoke, meta_isCloneOf, meta_isRelatedTo, meta_isStripedWith, meta_listFields, meta_listMethods, meta_lookup, meta_newInstance, meta_receive, meta_respondsTo, meta_select, meta_send, meta_share, readResolve, toString, writeReplace

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface edu.vub.at.objects.ATObject

base__opeql__opeql_, base_init, base_new, meta_addField, meta_addMethod, meta_assignField, meta_assignVariable, meta_clone, meta_defineField, meta_doesNotUnderstand, meta_extend, meta_getDynamicParent, meta_getLexicalParent, meta_getStripes, meta_grabField, meta_grabMethod, meta_invoke, meta_isCloneOf, meta_isRelatedTo, meta_isStripedWith, meta_listFields, meta_listMethods, meta_lookup, meta_newInstance, meta_pass, meta_receive, meta_resolve, meta_respondsTo, meta_select, meta_send, meta_share

Methods inherited from interface edu.vub.at.objects.coercion.ATConversions

asAmbientTalkObject, asJavaClassUnderSymbiosis, asJavaObjectUnderSymbiosis, asNativeBoolean, asNativeException, asNativeFarReference, asNativeFraction, asNativeNumber, asNativeNumeric, asNativeTable, asNativeText, base_asActorMirror, base_asAsyncMessage, base_asBegin, base_asBoolean, base_asClosure, base_asDefinition, base_asExpression, base_asFarReference, base_asField, base_asHandler, base_asMessage, base_asMessageCreation, base_asMethod, base_asMirror, base_asNumber, base_asSplice, base_asStatement, base_asStripe, base_asSymbol, base_asTable, base_asVariableAssignment, base_isBoolean, base_isCallFrame, base_isClosure, base_isFarReference, base_isMessageCreation, base_isMethod, base_isMirror, base_isSplice, base_isStripe, base_isSymbol, base_isTable, base_isVariableAssignment, isAmbientTalkObject, isJavaObjectUnderSymbiosis, isNativeBoolean, isNativeField, isNativeText

Field Detail

uqsExp_

private final ATExpression uqsExp_

Constructor Detail

AGUnquoteSplice

public AGUnquoteSplice(ATExpression exp)

Method Detail

base_getExpression

public ATExpression base_getExpression()

Specified by:

base_getExpression in interface ATUnquoteSplice

meta_eval

public ATObject meta_eval(ATContext ctx)
                   throws InterpreterException

An unquotation cannot be evaluated, but rather gives rise to an XIllegalUnquote exception. This is because an unquotation should always be nested within a quotation. AGUQS(exp).eval(ctx) = ERROR

Specified by:

meta_eval in interface ATObject

Overrides:

meta_eval in class NATNil

Throws:

InterpreterException

meta_quote

public ATObject meta_quote(ATContext ctx)
                    throws InterpreterException

Quoting a spliced unquotation means evaluating its contained expression, and returning its value as the result of the quote. A spliced unquotation can normally only be invoked where a table or begin is expected. The resulting table is replaced by the result of evaluating the unquote-splice's encapsulated expression. It is the table's responsibility to query an AGUnquoteSplice element for its expression and deal with the inlining appropriately.

Specified by:

meta_quote in interface ATObject

Overrides:

meta_quote in class NATNil

Throws:

InterpreterException

meta_print

public NATText meta_print()
                   throws InterpreterException

Description copied from interface: ATObject

Prints out the object in a human-readable way.

Specified by:

meta_print in interface ATObject

Overrides:

meta_print in class NATNil

Throws:

InterpreterException

base_isUnquoteSplice

public boolean base_isUnquoteSplice()

Specified by:

base_isUnquoteSplice in interface ATConversions

Overrides:

base_isUnquoteSplice in class NATNil

base_asUnquoteSplice

public ATUnquoteSplice base_asUnquoteSplice()

Specified by:

base_asUnquoteSplice in interface ATConversions

Overrides:

base_asUnquoteSplice in class NATNil