X-Git-Url: http://git.nguyen.vg/gitweb/?a=blobdiff_plain;f=TCImplementation.cpp;h=a8303d8be74b7251ba2171dda41cda9f27c4499a;hb=b472b8a9abdb1695994b4b23963de98c361dc66b;hp=211849e312f177c5acfa15387e0daf30b57c237d;hpb=2ff99d618e7f031bcfd95895c982e0958ae58d8c;p=SXSI%2FTextCollection.git

diff --git a/TCImplementation.cpp b/TCImplementation.cpp
index 211849e..a8303d8 100644
--- a/TCImplementation.cpp
+++ b/TCImplementation.cpp
@@ -968,19 +968,12 @@ void TCImplementation::maketables()
         this->bwtEndPos = i;
     }
 
-    // Build up arrays for text length and starting positions
-    // FIXME Temp, remove
+    // Build up array for text starting positions
     BlockArray* textStartPos = new BlockArray(numberOfTexts, Tools::CeilLog2(this->n));
     (*textStartPos)[0] = 0; 
 
-    // Construct samples
-    ulong sampleLength = (n%samplerate==0) ? n/samplerate : n/samplerate+1;
-    unsigned ceilLog2n = Tools::CeilLog2(n);
-    BlockArray* positions = new BlockArray(sampleLength, ceilLog2n);
-    BlockArray* tmpSuffix = new BlockArray(sampleLength, ceilLog2n);
-
     // Mapping from end-markers to doc ID's:
-    BlockArray *endmarkerDocId = new BlockArray(numberOfTexts, Tools::CeilLog2(numberOfTexts));
+    uint *endmarkerDocId = new uint[numberOfTexts]; // FIXME Use BlockArray with static_sequence_wvtree_noptrs.
   
     uint *sampledpositions = new uint[n/(sizeof(uint)*8)+1];
     for (ulong i = 0; i < n / (sizeof(uint)*8) + 1; i++)
@@ -995,14 +988,15 @@ void TCImplementation::maketables()
     ulongmax--;
     uint alphabetrank_i_tmp =0;
 
+    /**
+     * First pass: populate tables textStartPos and sampledpositions.
+     */
     for (ulong i=n-1;i<ulongmax;i--) {
         // i substitutes SA->GetPos(i)
         x=(i==n-1)?0:i+1;
 
         if (x % samplerate == 0 && posOfSuccEndmarker - x > samplerate) {
             set_field(sampledpositions,1,p,1);
-            (*positions)[sampleCount] = p; 
-            (*tmpSuffix)[sampleCount] = x; // FIXME remove
             sampleCount ++;
         }
 
@@ -1013,7 +1007,7 @@ void TCImplementation::maketables()
             
             // Record the order of end-markers in BWT:
             ulong endmarkerRank = alphabetrank_i_tmp - 1;
-            (*endmarkerDocId)[endmarkerRank] = textId;
+            endmarkerDocId[endmarkerRank] = (textId + 1) % numberOfTexts;
 
             // Store text length and text start position:
             if (textId < (DocId)numberOfTexts - 1)
@@ -1032,29 +1026,43 @@ void TCImplementation::maketables()
     
     sampled = new static_bitsequence_rrr02(sampledpositions, n, 16);
     delete [] sampledpositions;
-    sampleLength = sampled->rank1(n-1);
+    ulong sampleLength = sampled->rank1(n-1);
     assert(sampleCount == sampleLength);
 
     // Suffixes store an offset from the text start position
     suffixes = new BlockArray(sampleLength, Tools::CeilLog2(maxTextLength));
     suffixDocId = new BlockArray(sampleLength, Tools::CeilLog2(numberOfTexts));
 
-    for(ulong i=0; i<sampleLength; i++) {
-        assert((*positions)[i] < n);
-        ulong j = sampled->rank1((*positions)[i]);
+    p=bwtEndPos;
+    textId = numberOfTexts;
+
+    /**
+     * Second pass: populate tables suffixes and suffixDocId.
+     */
+    for (ulong i=n-1;i<ulongmax;i--) {
+        x=(i==n-1)?0:i+1;
+
+        if (sampled->access(p)) {
+            ulong j = sampled->rank1(p)-1;
 
-        if (j==0) j=sampleLength;
-        TextPosition textPos = (*tmpSuffix)[i];
-        (*suffixDocId)[j-1] = DocIdAtTextPos(textStartPos, textPos);
+            (*suffixDocId)[j] = DocIdAtTextPos(textStartPos, x);
 
-        assert((unsigned)DocIdAtTextPos(textStartPos, textPos) < numberOfTexts);
-        assert((*suffixDocId)[j-1] < numberOfTexts);
-        // calculate offset from text start:
-        (*suffixes)[j-1] = textPos - (*textStartPos)[(*suffixDocId)[j-1]];
+            // calculate offset from text start:
+            (*suffixes)[j] = x - (*textStartPos)[(*suffixDocId)[j]];
+        }
+
+        uchar c = alphabetrank->access(p, alphabetrank_i_tmp);
+        if (c == '\0')
+        {
+            --textId;
+            // LF-mapping from '\0' does not work with this (pseudo) BWT (see details from Wolfgang's thesis).
+            p = textId; // Correct LF-mapping to the last char of the previous text.
+        }
+        else // Now c != '\0', do LF-mapping:
+            p = C[c]+alphabetrank_i_tmp-1;
     }
-    // FIXME Temp, remove
-    delete tmpSuffix;
-    delete positions;
+    assert(textId == 0);
+
     delete textStartPos;
 
 #ifdef DEBUG_MEMUSAGE
@@ -1062,31 +1070,15 @@ void TCImplementation::maketables()
     HeapProfiler::ResetMaxHeapConsumption();
 #endif
 
-    uint *tmp = new uint[numberOfTexts]; // FIXME Silly...
-    for (unsigned i = 0; i < numberOfTexts; ++i)
-    {
-        tmp[i] = ((*endmarkerDocId)[i] + 1) % numberOfTexts;
-//        cout << tmp[i] << ",";
-    }
-//    cout << endl;
-    delete endmarkerDocId;
-
     alphabet_mapper * am = new alphabet_mapper_none();
     static_bitsequence_builder * bmb = new static_bitsequence_builder_brw32(16); // FIXME samplerate?
-    Doc = new static_sequence_wvtree_noptrs(tmp, numberOfTexts, bmb, am);
+    Doc = new static_sequence_wvtree_noptrs(endmarkerDocId, numberOfTexts, bmb, am, true);
     delete bmb;
-    //  delete [] tmp; // already deleted!
+    // delete [] endmarkerDocId; // already deleted in static_sequence_wvtree_noptrs!
 
 #ifdef DEBUG_MEMUSAGE
     std::cerr << "max heap usage after Doc: " << HeapProfiler::GetMaxHeapConsumption()/(1024*1024) << " Mbytes" << std::endl;
 #endif
-
-    /*document_result res = Doc->access(3, 3, 0, 3);
-    cout << "Access result: ";
-    for (document_result::iterator it = res.begin(); it != res.end(); ++it)
-        cout << *it << ", ";
-        cout << endl;
-        exit(0);*/
 }