gnu.xquery.util
Class RelativeStep

java.lang.Object
  gnu.mapping.PropertySet
      gnu.mapping.Procedure
          gnu.mapping.ProcedureN
              gnu.mapping.MethodProc
                  gnu.xquery.util.RelativeStep

All Implemented Interfaces:

CanInline, Inlineable, Named

public class RelativeStep
extends MethodProc
implements CanInline, Inlineable

Implements XPath path expression. The XPath expression E1/E2 is compiled into: (relative-step E1 (lambda (dot position last) E2)).

Field Summary

static RelativeStep

relativeStep

Fields inherited from class gnu.mapping.MethodProc

argTypes, NO_MATCH, NO_MATCH_AMBIGUOUS, NO_MATCH_BAD_TYPE, NO_MATCH_TOO_FEW_ARGS, NO_MATCH_TOO_MANY_ARGS

Fields inherited from class gnu.mapping.ProcedureN

noArgs

Fields inherited from class gnu.mapping.PropertySet

nameKey

Constructor Summary

RelativeStep()

Method Summary

void	apply(CallContext ctx) Call this Procedure using the explicit-CallContext-convention.
void	compile(ApplyExp exp, Compilation comp, Target target)
static TreeScanner	extractStep(Expression exp)
Type	getReturnType(Expression[] args)
Expression	inline(ApplyExp exp, InlineCalls walker, boolean argsInlined) Inline an application of this Procedure and return result.
int	numArgs() Return minArgs()|(maxArgs<<12).

Methods inherited from class gnu.mapping.MethodProc

applyN, getParameterType, isApplicable, matchFailAsException, mostSpecific, mostSpecific, numParameters, resolveParameterTypes

Methods inherited from class gnu.mapping.ProcedureN

apply0, apply1, apply2, apply3, apply4

Methods inherited from class gnu.mapping.Procedure

apply, check0, check1, check2, check3, check4, checkArgCount, checkN, getSetter, getSourceLocation, match0, match1, match2, match3, match4, matchN, maxArgs, minArgs, set0, set1, setN, setSetter, setSourceLocation, toString

Methods inherited from class gnu.mapping.PropertySet

getName, getProperty, getSymbol, removeProperty, setName, setProperty, setProperty, setSymbol

Methods inherited from class java.lang.Object

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

Field Detail

relativeStep

public static final RelativeStep relativeStep

Constructor Detail

RelativeStep

public RelativeStep()

Method Detail

numArgs

public int numArgs()

Description copied from class: Procedure

Return minArgs()|(maxArgs<<12).

Overrides:

numArgs in class Procedure

apply

public void apply(CallContext ctx)
           throws java.lang.Throwable

Description copied from class: Procedure

Call this Procedure using the explicit-CallContext-convention. The input arguments are (by default) in stack.args; the result is written to ctx.consumer.

Overrides:

apply in class Procedure

Throws:

java.lang.Throwable

inline

public Expression inline(ApplyExp exp,
                         InlineCalls walker,
                         boolean argsInlined)

Description copied from interface: CanInline

Inline an application of this Procedure and return result. Unless argsInlined is true, then this method is responsible for walking exp.getArgs(); you can handle this using exp.getArgs(walker, argsInlined). (The exp.getFunction() has been walked, regardless.)

Specified by:

inline in interface CanInline

argsInlined - true if the arguments have been inlined. Can return original expression.

compile

public void compile(ApplyExp exp,
                    Compilation comp,
                    Target target)

Specified by:

compile in interface Inlineable

getReturnType

public Type getReturnType(Expression[] args)

Specified by:

getReturnType in interface Inlineable

extractStep

public static TreeScanner extractStep(Expression exp)