org.erights.e.elang.evm
Class QuasiPatternExpr

java.lang.Object
  |
  +--org.erights.e.elang.evm.ParseNode
        |
        +--org.erights.e.elang.evm.ENode
              |
              +--org.erights.e.elang.evm.EExpr
                    |
                    +--org.erights.e.elang.evm.AtomicExpr
                          |
                          +--org.erights.e.elang.evm.QuasiPatternExpr

All Implemented Interfaces:

Cloneable, EPrintable, MatchMaker

public class QuasiPatternExpr

extends AtomicExpr

Untamed: BNF: '@' '{' '}'

Not part of a valid E program, but a part of an E parse tree acting as a MatchMaker (as a pattern to be matched against an E program).

Author:

Mark S. Miller

Field Summary

private int

myIndex

Fields inherited from class org.erights.e.elang.evm.ENode

Fields inherited from class org.erights.e.elang.evm.ParseNode

NUM_PR, PR_ASSIGN, PR_CALL, PR_COMP, PR_EEXPR, PR_LISTPATT, PR_ORDER, PR_PATTERN, PR_PRIM, PR_START

Constructor Summary

QuasiPatternExpr(SourceSpan optSpan, int index)
Enabled:

Method Summary

NounExpr	asNoun() Enabled:
protected StaticScope	computeStaticScope() When staticScope() is first requested on a given node, it calls computeStaticScope() to do the actual computation, which is then remembered.
int	index() Enabled:
boolean	matchBind(ConstList args, Object specimen, FlexList bindings) Enabled:
boolean	mayBeAssignable() Enabled:
protected Object	subEval(EvalContext ctx, boolean forValue) The recursive part that does the work
void	subPrintOn(TextWriter out, int priority) Enabled:
Object	welcome(ETreeVisitor visitor) Enabled:

Methods inherited from class org.erights.e.elang.evm.EExpr

__printOn, appendAllTo, appendTo, eval, eval, evalBool, printAsBlockOn, substitute, transform

Methods inherited from class org.erights.e.elang.evm.ENode

cleanCopy, copy, getOptPatternMap, getOptScopeMap, getPatternMap, getScopeMap, qbuild, setPatternMap, setScopeMap, staticScope, synEnv

Methods inherited from class org.erights.e.elang.evm.ParseNode

asText, getOptSpan, lnPrintOn, lnPrintOn, matchBind, matchBind, matchBind, printListOn, toString

Methods inherited from class java.lang.Object

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

Field Detail

myIndex

private final int myIndex

Constructor Detail

QuasiPatternExpr

public QuasiPatternExpr(SourceSpan optSpan,
                        int index)

Enabled:

Method Detail

welcome

public Object welcome(ETreeVisitor visitor)

Enabled:

Specified by:

welcome in class ENode

computeStaticScope

protected StaticScope computeStaticScope()

Description copied from class: ENode

When staticScope() is first requested on a given node, it calls computeStaticScope() to do the actual computation, which is then remembered.

Specified by:

computeStaticScope in class ENode

subEval

protected Object subEval(EvalContext ctx,
                         boolean forValue)

Description copied from class: EExpr

The recursive part that does the work

Specified by:

subEval in class EExpr

index

public int index()

Enabled:

matchBind

public boolean matchBind(ConstList args,
                         Object specimen,
                         FlexList bindings)

Enabled:

Specified by:

matchBind in interface MatchMaker

Specified by:

matchBind in class ParseNode

subPrintOn

public void subPrintOn(TextWriter out,
                       int priority)
                throws IOException

Enabled:

Specified by:

subPrintOn in class ParseNode

IOException

mayBeAssignable

public boolean mayBeAssignable()

Enabled:

Specified by:

mayBeAssignable in class AtomicExpr

asNoun

public NounExpr asNoun()

Enabled:

Specified by:

asNoun in class AtomicExpr