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java.lang.Object | +--com.inxar.syntacs.grammar.regular.REPositiveClosure
Standard PositiveClosure
implementation.
Constructor Summary | |
REPositiveClosure(REGrammar grammar,
RegularExpression internal)
Constructs the REPositiveClosure on the given
REGrammar and input RegularExpression . |
Method Summary | |
Object |
clone()
See the general explanation of clone() given above. |
void |
follow()
Triggers the process of computing the follow sets. |
IntSet |
getFirstSet()
Returns the IntSet of Intervals which
are visible at the logical beginning of the the expression. |
RegularExpression |
getInternal()
Returns the RegularExpression this closure
'wraps'. |
IntSet |
getLastSet()
Returns the IntSet of Intervals which
are visible at the logical end of the the expression. |
boolean |
isNullable()
Returns true if this
RegularExpression either *is* Epsilon
or derives it. |
String |
toString()
|
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public REPositiveClosure(REGrammar grammar, RegularExpression internal)
REPositiveClosure
on the given
REGrammar
and input RegularExpression
.Method Detail |
public String toString()
toString
in class Object
public boolean isNullable()
RegularExpression
true
if this
RegularExpression
either *is* Epsilon
or derives it.isNullable
in interface RegularExpression
public IntSet getFirstSet()
RegularExpression
IntSet
of Intervals
which
are visible at the logical beginning of the the expression.getFirstSet
in interface RegularExpression
public IntSet getLastSet()
RegularExpression
IntSet
of Intervals
which
are visible at the logical end of the the expression.getLastSet
in interface RegularExpression
public void follow()
RegularExpression
follow
in interface RegularExpression
public RegularExpression getInternal()
PositiveClosure
RegularExpression
this closure
'wraps'. Thus for a positive closure a_plus
(a+
), a_plus.getInternal()
would
return 'a
'.getInternal
in interface PositiveClosure
public Object clone() throws CloneNotSupportedException
RegularExpression
clone()
given above.clone
in interface RegularExpression
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