/********************************************************
* Function: CSet
*******************************************************/
public CSet
(
)
{
m_set = new SparseBitSet();
m_complement = false;
}
/**
* Compares two SparseBitSets for equality.
* @return true if the objects are the same; false otherwise.
*/
public static bool equals(SparseBitSet a, SparseBitSet b)
{
for (int i = 0, j = 0; i < a._size || j < b._size;)
{
if (i < a._size && (j >= b._size || a.offs[i] < b.offs[j]))
{
if (a.bits[i++] != 0)
{
return(false);
}
}
else if (j < b._size && (i >= a._size || a.offs[i] > b.offs[j]))
{
if (b.bits[j++] != 0)
{
return(false);
}
}
else
{ // equal keys
if (a.bits[i++] != b.bits[j++])
{
return(false);
}
}
}
return(true);
}
/********************************************************
* Function: mimic
* Description: Converts this NFA state into a copy of
* the input one.
*******************************************************/
public void mimic
(
CNfa nfa
)
{
m_edge = nfa.m_edge;
if (null != nfa.m_set)
{
if (null == m_set)
{
m_set = new CSet();
}
m_set.mimic(nfa.m_set);
}
else
{
m_set = null;
}
m_next = nfa.m_next;
m_next2 = nfa.m_next2;
m_accept = nfa.m_accept;
m_anchor = nfa.m_anchor;
if (null != nfa.m_states)
{
m_states = (SparseBitSet)nfa.m_states.Clone();
}
else
{
m_states = null;
}
}
private static void binop(SparseBitSet a, SparseBitSet b, BinOp op)
{
int nsize = a._size + b._size;
long[] nbits;
int [] noffs;
int a_zero, a_size;
// be very clever and avoid allocating more memory if we can.
if (a.bits.Length < nsize)
{ // oh well, have to make working space.
nbits = new long[nsize];
noffs = new int [nsize];
a_zero = 0; a_size = a._size;
}
else
{ // reduce, reuse, recycle!
nbits = a.bits;
noffs = a.offs;
a_zero = a.bits.Length - a._size; a_size = a.bits.Length;
// System.arraycopy(a.bits, 0, a.bits, a_zero, a.size);
Array.Copy(a.bits, 0, a.bits, a_zero, a._size);
//System.arraycopy(a.offs, 0, a.offs, a_zero, a.size);
Array.Copy(a.offs, 0, a.offs, a_zero, a._size);
}
// ok, crunch through and binop those sets!
nsize = 0;
for (int i = a_zero, j = 0; i < a_size || j < b._size;)
{
long nb; int no;
if (i < a_size && (j >= b._size || a.offs[i] < b.offs[j]))
{
nb = op.op(a.bits[i], 0);
no = a.offs[i];
i++;
}
else if (j < b._size && (i >= a_size || a.offs[i] > b.offs[j]))
{
nb = op.op(0, b.bits[j]);
no = b.offs[j];
j++;
}
else
{ // equal keys; merge.
nb = op.op(a.bits[i], b.bits[j]);
no = a.offs[i];
i++; j++;
}
if (nb != 0)
{
nbits[nsize] = nb;
noffs[nsize] = no;
nsize++;
}
}
a.bits = nbits;
a.offs = noffs;
a._size = nsize;
}
/********************************************************
* Function: mimic
*******************************************************/
public void mimic
(
CSet Set
)
{
m_complement = Set.m_complement;
m_set = (SparseBitSet)Set.m_set.Clone();
}
/** Self-test. */
public static void _Main(string[] args)
{
const int ITER = 500;
const int RANGE = 65536;
SparseBitSet a = new SparseBitSet();
CUtility.ASSERT(!a.Get(0) && !a.Get(1));
CUtility.ASSERT(!a.Get(123329));
a.Set(0); CUtility.ASSERT(a.Get(0) && !a.Get(1));
a.Set(1); CUtility.ASSERT(a.Get(0) && a.Get(1));
a.clearAll();
CUtility.ASSERT(!a.Get(0) && !a.Get(1));
Random r = new Random();
Vector v = new Vector();
for (int n = 0; n < ITER; n++)
{
int rr = ((r.Next() >> 1) % RANGE) << 1;
a.Set(rr); v.addElement(rr);
// check that all the numbers are there.
CUtility.ASSERT(a.Get(rr) && !a.Get(rr + 1) && !a.Get(rr - 1));
for (int i = 0; i < v.size(); i++)
{
CUtility.ASSERT(a.Get((int)v.elementAt(i)));
}
}
SparseBitSet b = (SparseBitSet)a.Clone();
CUtility.ASSERT(a.Equals(b) && b.Equals(a));
for (int n = 0; n < ITER / 2; n++)
{
int rr = (r.Next() >> 1) % v.size();
int m = (int)v.elementAt(rr);
b.clear(m); v.removeElementAt(rr);
// check that numbers are removed properly.
CUtility.ASSERT(!b.Get(m));
}
CUtility.ASSERT(!a.Equals(b));
SparseBitSet c = (SparseBitSet)a.Clone();
SparseBitSet d = (SparseBitSet)a.Clone();
c.and(a);
CUtility.ASSERT(c.Equals(a) && a.Equals(c));
c.xor(a);
CUtility.ASSERT(!c.Equals(a) && c.size() == 0);
d.or(b);
CUtility.ASSERT(d.Equals(a) && !b.Equals(d));
d.and(b);
CUtility.ASSERT(!d.Equals(a) && b.Equals(d));
d.xor(a);
CUtility.ASSERT(!d.Equals(a) && !b.Equals(d));
c.or(d); c.or(b);
CUtility.ASSERT(c.Equals(a) && a.Equals(c));
c = (SparseBitSet)d.Clone();
c.and(b);
CUtility.ASSERT(c.size() == 0);
System.Console.WriteLine("Success.");
}
/**
* Clones the SparseBitSet.
*/
public object Clone()
{
//SI:was clone
SparseBitSet Set = (SparseBitSet)base.MemberwiseClone();
Set.bits = (long[])bits.Clone();
Set.offs = (int [])offs.Clone();
return(Set);
}
public int m_accept_index; /* CNfa index corresponding to accepting actions. */
/***************************************************************
* Function: CBunch
* Description: Constructor.
**************************************************************/
public CBunch
(
)
{
m_nfa_set = null;
m_nfa_bit = null;
m_accept = null;
m_anchor = CSpec.NONE;
m_accept_index = -1;
}
/********************************************************
* Function: CNfa
*******************************************************/
public CNfa
(
)
{
m_edge = EMPTY;
m_set = null;
m_next = null;
m_next2 = null;
m_accept = null;
m_anchor = CSpec.NONE;
m_label = NO_LABEL;
m_states = null;
}
/***************************************************************
* Function: CDfa
**************************************************************/
public CDfa
(
int label
)
{
m_group = 0;
m_mark = false;
m_accept = null;
m_anchor = CSpec.NONE;
m_nfa_set = null;
m_nfa_bit = null;
m_label = label;
}
/***************************************************************
* Function: processStates
* Description:
**************************************************************/
private void processStates
(
SparseBitSet states,
CNfa current
)
{
int size;
int i;
size = m_spec.m_states.Count;
for (i = 0; i < size; ++i)
{
if (states.Get(i))
{
m_spec.m_state_rules[i].addElement(current);
}
}
}
public mEnum(SparseBitSet parent)
{
mSet = parent;
}
/***************************************************************
* Function: reduce
* Description:
**************************************************************/
private void reduce
(
)
{
int i;
int j;
int k;
int nrows;
int reduced_ncols;
int reduced_nrows;
SparseBitSet Set;
CDTrans dtrans;
int size;
Set = new SparseBitSet();
/* Save accept nodes and anchor entries. */
size = m_spec.m_dtrans_vector.size();
m_spec.m_anchor_array = new int[size];
m_spec.m_accept_vector = new Vector();
for (i = 0; i < size; ++i)
{
dtrans = (CDTrans)m_spec.m_dtrans_vector.elementAt(i);
m_spec.m_accept_vector.addElement(dtrans.m_accept);
m_spec.m_anchor_array[i] = dtrans.m_anchor;
dtrans.m_accept = null;
}
/* Allocate column map. */
m_spec.m_col_map = new int[m_spec.m_dtrans_ncols];
for (i = 0; i < m_spec.m_dtrans_ncols; ++i)
{
m_spec.m_col_map[i] = -1;
}
/* Process columns for reduction. */
for (reduced_ncols = 0; ; ++reduced_ncols)
{
#if (DEBUG)
{
for (i = 0; i < reduced_ncols; ++i)
{
CUtility.ASSERT(-1 != m_spec.m_col_map[i]);
}
}
#endif
for (i = reduced_ncols; i < m_spec.m_dtrans_ncols; ++i)
{
if (-1 == m_spec.m_col_map[i])
{
break;
}
}
if (i >= m_spec.m_dtrans_ncols)
{
break;
}
#if (DEBUG)
{
CUtility.ASSERT(false == Set.Get(i));
CUtility.ASSERT(-1 == m_spec.m_col_map[i]);
}
#endif
Set.Set(i);
m_spec.m_col_map[i] = reduced_ncols;
/* UNDONE: Optimize by doing all comparisons in one batch. */
for (j = i + 1; j < m_spec.m_dtrans_ncols; ++j)
{
if (-1 == m_spec.m_col_map[j] && col_equiv(i, j))
{
m_spec.m_col_map[j] = reduced_ncols;
}
}
}
/* Reduce columns. */
k = 0;
for (i = 0; i < m_spec.m_dtrans_ncols; ++i)
{
if (Set.Get(i))
{
++k;
Set.clear(i);
j = m_spec.m_col_map[i];
#if (DEBUG)
{
CUtility.ASSERT(j <= i);
}
#endif
if (j == i)
{
continue;
}
col_copy(j, i);
}
}
m_spec.m_dtrans_ncols = reduced_ncols;
/* truncate m_dtrans at proper length (freeing extra) */
trunc_col();
#if (DEBUG)
{
CUtility.ASSERT(k == reduced_ncols);
}
#endif
/* Allocate row map. */
nrows = m_spec.m_dtrans_vector.Count;
m_spec.m_row_map = new int[nrows];
for (i = 0; i < nrows; ++i)
{
m_spec.m_row_map[i] = -1;
}
/* Process rows to reduce. */
for (reduced_nrows = 0; ; ++reduced_nrows)
{
#if (DEBUG)
{
for (i = 0; i < reduced_nrows; ++i)
{
CUtility.ASSERT(-1 != m_spec.m_row_map[i]);
}
}
#endif
for (i = reduced_nrows; i < nrows; ++i)
{
if (-1 == m_spec.m_row_map[i])
{
break;
}
}
if (i >= nrows)
{
break;
}
#if (DEBUG)
{
CUtility.ASSERT(false == Set.Get(i));
CUtility.ASSERT(-1 == m_spec.m_row_map[i]);
}
#endif
Set.Set(i);
m_spec.m_row_map[i] = reduced_nrows;
/* UNDONE: Optimize by doing all comparisons in one batch. */
for (j = i + 1; j < nrows; ++j)
{
if (-1 == m_spec.m_row_map[j] && row_equiv(i, j))
{
m_spec.m_row_map[j] = reduced_nrows;
}
}
}
/* Reduce rows. */
k = 0;
for (i = 0; i < nrows; ++i)
{
if (Set.Get(i))
{
++k;
Set.clear(i);
j = m_spec.m_row_map[i];
#if (DEBUG)
{
CUtility.ASSERT(j <= i);
}
#endif
if (j == i)
{
continue;
}
row_copy(j, i);
}
}
m_spec.m_dtrans_vector.setSize(reduced_nrows);
#if (DEBUG)
{
/*System.Console.WriteLine("k = " + k + "\nreduced_nrows = " + reduced_nrows + "");*/
CUtility.ASSERT(k == reduced_nrows);
}
#endif
}
/**
* Creates an empty Set with the same size as the given Set.
*/
public SparseBitSet(SparseBitSet _set)
{
bits = new long[_set._size];
offs = new int [_set._size];
_size = 0;
}
/***************************************************************
* Function: machine
* Description: Recursive descent regular expression parser.
**************************************************************/
private CNfa machine
(
)
{
CNfa start;
CNfa p;
SparseBitSet states;
#if (DESCENT_DEBUG)
{
CUtility.enter("machine", m_spec.m_lexeme, m_spec.m_current_token);
}
#endif
start = CAlloc.newCNfa(m_spec);
p = start;
states = m_lexGen.getStates();
/* Begin: Added for states. */
m_spec.m_current_token = CLexGen.EOS;
m_lexGen.advance();
/* End: Added for states. */
if (CLexGen.END_OF_INPUT != m_spec.m_current_token) // CSA fix.
{
p.m_next = rule();
processStates(states, p.m_next);
}
while (CLexGen.END_OF_INPUT != m_spec.m_current_token)
{
/* Make state changes HERE. */
states = m_lexGen.getStates();
/* Begin: Added for states. */
m_lexGen.advance();
if (CLexGen.END_OF_INPUT == m_spec.m_current_token)
{
break;
}
/* End: Added for states. */
p.m_next2 = CAlloc.newCNfa(m_spec);
p = p.m_next2;
p.m_next = rule();
processStates(states, p.m_next);
}
// CSA: add pseudo-rules for BOL and EOF
SparseBitSet all_states = new SparseBitSet();
for (int i = 0; i < m_spec.m_states.Count; ++i)
{
all_states.Set(i);
}
p.m_next2 = CAlloc.newCNfa(m_spec);
p = p.m_next2;
p.m_next = CAlloc.newCNfa(m_spec);
p.m_next.m_edge = CNfa.CCL;
p.m_next.m_next = CAlloc.newCNfa(m_spec);
p.m_next.m_set = new CSet();
p.m_next.m_set.add(m_spec.BOL);
p.m_next.m_set.add(m_spec.EOF);
p.m_next.m_next.m_accept = // do-nothing accept rule
new CAccept(new char[0], 0, m_input.m_line_number + 1);
processStates(all_states, p.m_next);
// CSA: done.
#if (DESCENT_DEBUG)
{
CUtility.leave("machine", m_spec.m_lexeme, m_spec.m_current_token);
}
#endif
return(start);
}
/**
* Logically XORs this bit Set with the specified Set of bits.
* @param Set the bit Set to be XORed with
*/
public void xor(SparseBitSet Set)
{
binop(this, Set, XOR);
}
/**
* Logically ANDs this bit Set with the specified Set of bits.
* @param Set the bit Set to be ANDed with
*/
public void and(SparseBitSet Set)
{
binop(this, Set, AND);
}
/***************************************************************
* Function: move
* Description: Returns null if resulting NFA Set is empty.
**************************************************************/
void move
(
Vector nfa_set,
SparseBitSet nfa_bit,
int b,
CBunch bunch
)
{
int size;
int index;
CNfa state;
bunch.m_nfa_set = null;
bunch.m_nfa_bit = null;
size = nfa_set.Count;
// System.Console.WriteLine(size);
for (index = 0; index < size; ++index)
{
state = (CNfa)nfa_set.elementAt(index);
// System.Console.WriteLine(index+" "+state.m_set);
if (b == state.m_edge ||
(CNfa.CCL == state.m_edge &&
state.m_set.contains(b)))
{
// System.Console.WriteLine(state.m_edge+" "+b);
if (null == bunch.m_nfa_set)
{
#if (DEBUG)
{
CUtility.ASSERT(null == bunch.m_nfa_bit);
}
#endif
bunch.m_nfa_set = new Vector();
/*bunch.m_nfa_bit
* = new SparseBitSet(m_spec.m_nfa_states.size());*/
bunch.m_nfa_bit = new SparseBitSet();
}
bunch.m_nfa_set.addElement(state.m_next);
/*System.Console.WriteLine("Size of bitset: " + bunch.m_nfa_bit.size());
* System.Console.WriteLine("Reference index: " + state.m_next.m_label);
* System.out.flush();*/
bunch.m_nfa_bit.Set(state.m_next.m_label);
}
}
if (null != bunch.m_nfa_set)
{
#if (DEBUG)
{
CUtility.ASSERT(null != bunch.m_nfa_bit);
}
#endif
sortStates(bunch.m_nfa_set);
}
return;
}
/** Compute minimum Set of character classes needed to disambiguate
* edges. We optimistically assume that every character belongs to
* a single character class, and then incrementally split classes
* as we see edges that require discrimination between characters in
* the class. [CSA, 25-Jul-1999] */
private void computeClasses(CSpec m_spec)
{
this.original_charset_size = m_spec.m_dtrans_ncols;
this.ccls = new int[original_charset_size]; // initially all zero.
int nextcls = 1;
SparseBitSet clsA = new SparseBitSet(), clsB = new SparseBitSet();
Hashtable h = new Hashtable();
if (m_spec.m_verbose)
{
System.Console.Write("Working on character classes.");
}
IEnumerator e = m_spec.m_nfa_states.elements();
while (e.MoveNext())
{
CNfa nfa = (CNfa)e.Current;
if (nfa.m_edge == CNfa.EMPTY || nfa.m_edge == CNfa.EPSILON)
{
continue; // no discriminatory information.
}
clsA.clearAll(); clsB.clearAll();
for (int i = 0; i < ccls.Length; i++)
{
if (nfa.m_edge == i || // edge labeled with a character
nfa.m_edge == CNfa.CCL && nfa.m_set.contains(i)) // Set of characters
{
clsA.Set(ccls[i]);
}
else
{
clsB.Set(ccls[i]);
}
}
// now figure out which character classes we need to split.
clsA.and(clsB); // split the classes which show up on both sides of edge
if (m_spec.m_verbose)
{
System.Console.Write(clsA.size() == 0?".":":");
}
if (clsA.size() == 0)
{
continue; // nothing to do.
}
// and split them.
h.Clear(); // h will map old to new class name
for (int i = 0; i < ccls.Length; i++)
{
if (clsA.Get(ccls[i])) // a split class
{
if (nfa.m_edge == i ||
nfa.m_edge == CNfa.CCL && nfa.m_set.contains(i))
{ // on A side
int split = ccls[i];
if (!h.ContainsKey(split))
{
h.Add(split, (nextcls++)); // make new class
}
ccls[i] = (int)h[split];
}
}
}
}
if (m_spec.m_verbose)
{
System.Console.WriteLine();
System.Console.WriteLine("NFA has " + nextcls + " distinct character classes.");
}
this.mapped_charset_size = nextcls;
}
