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


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