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java.lang.Object | +--com.inxar.syntacs.grammar.regular.REClosure
Standard Closure
implementation.
Constructor Summary | |
REClosure(REGrammar grammar,
RegularExpression regex)
Constructs the REClosure 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 regex this closure 'wraps' Thus for a closure kleene ('a*'), kleene.getInternal() would return
'a'. |
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 REClosure(REGrammar grammar, RegularExpression regex)
REClosure
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()
Closure
kleene.getInternal()
would return
'a'.getInternal
in interface Closure
public Object clone() throws CloneNotSupportedException
RegularExpression
clone()
given above.clone
in interface RegularExpression
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