iterate through feature file

mert/FeatureDataIterator.cpp

@@ -19,22 +19,77 @@ You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 ***********************************************************************/
+#include <iostream>
+#include <sstream>
 
+#include "util/string_piece.hh"
+#include "util/tokenize_piece.hh"
+
+#include "FeatureArray.h"
 #include "FeatureDataIterator.h"
 
+
 using namespace std;
+using namespace util;
+
+
+
+FeatureDataIterator::FeatureDataIterator() {}
 
 FeatureDataIterator::FeatureDataIterator(const string filename) {
+  m_in.reset(new FilePiece(filename.c_str()));
+  readNext();
+}
+
+void FeatureDataIterator::readNext() {
+  try {
+    StringPiece marker = m_in->ReadDelimited();
+    if (marker != StringPiece(FEATURES_TXT_BEGIN)) {
+      throw FileFormatException(m_in->FileName(), marker.as_string());
+    }
+    size_t sentenceId = m_in->ReadULong();
+    size_t count = m_in->ReadULong();
+    cerr << "Expecting " << count << endl;
+    m_in->ReadLine(); //discard rest of line
+    for (size_t i = 0; i < count; ++i) {
+      StringPiece line = m_in->ReadLine();
+      for (util::TokenIter<util::AnyCharacter, true> token(line, util::AnyCharacter(" \t")); token; ++token) {
+        //TODO: Create FeatureDataItem
+        char* err_ind;
+        float value = static_cast<float>(strtod(token->data(), &err_ind));
+        if (err_ind == token->data()) {
+          throw FileFormatException(m_in->FileName(), line.as_string());
+        }
+        cerr << value << ",";
+      }
+      cerr << "\n";
+    }
+    StringPiece line = m_in->ReadLine();
+    if (line != StringPiece(FEATURES_TXT_END)) {
+      throw FileFormatException(m_in->FileName(), line.as_string());
+    }
+  } catch (EndOfFileException &e) {
+    m_in.reset();
+  }
 }
 
 void FeatureDataIterator::increment() {
-
+  readNext();
 }
 
 bool FeatureDataIterator::equal(const FeatureDataIterator& rhs) const {
-
+  if (!m_in && !rhs.m_in) {
+    return true;
+  } else if (!m_in) {
+    return false;
+  } else if (!rhs.m_in) {
+    return false;
+  } else {
+    return m_in->FileName() == rhs.m_in->FileName() && 
+      m_in->Offset() == rhs.m_in->Offset();
+  }
 }
 
 const vector<FeatureDataItem>& FeatureDataIterator::dereference() const {
-
+  return m_next;
 }

mert/FeatureDataIterator.h

@@ -29,36 +29,17 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
 #include <fstream>
 #include <map>
+#include <memory>
+#include <stdexcept>
 #include <vector>
 
 #include <boost/iterator/iterator_facade.hpp>
+#include <boost/shared_ptr.hpp>
 
+#include "util/file_piece.hh"
 
-//Minimal sparse vector
-class SparseVector {
+#include "FeatureStats.h"
 
-  public:
-    typedef std::map<size_t,float> fvector_t;
-    typedef std::map<std::string, size_t> name2id_t;
-    typedef std::vector<std::string> id2name_t;
-
-    float get(std::string name) const;
-    float get(size_t id) const;
-    void set(std::string name, float value);
-    void clear();
-    size_t size() const;
-
-    void write(std::ostream& out, const std::string& sep = " ") const;
-
-    SparseVector& operator-=(const SparseVector& rhs);
-
-  private:
-    static name2id_t name2id_;
-    static id2name_t id2name_;
-    fvector_t fvector_;
-};
-
-SparseVector operator-(const SparseVector& lhs, const SparseVector& rhs);
 
 class FeatureDataItem {
   public:
@@ -66,16 +47,24 @@ class FeatureDataItem {
     SparseVector sparse;
 };
 
+class FileFormatException : public util::Exception {
+  public:
+    explicit FileFormatException(const std::string filename, const std::string& line) {
+      *this << "Error in line \"" << line << "\" of " << filename;
+    }
+};
+
 class FeatureDataIterator : 
   public boost::iterator_facade<FeatureDataIterator,
                                 const std::vector<FeatureDataItem>,
                                 boost::forward_traversal_tag> 
 {
   public:
+    FeatureDataIterator();
     FeatureDataIterator(const std::string filename);
 
     static FeatureDataIterator end() {
-      return FeatureDataIterator("");
+      return FeatureDataIterator();
     }
 
 
@@ -86,7 +75,10 @@ class FeatureDataIterator :
     bool equal(const FeatureDataIterator& rhs) const;
     const std::vector<FeatureDataItem>& dereference() const;
 
-    std::ifstream* in_;
+    void readNext();
+
+    boost::shared_ptr<util::FilePiece> m_in;
+    std::vector<FeatureDataItem> m_next;
 };
 
 #endif

mert/pro.cpp

@@ -77,6 +77,7 @@ int main(int argc, char** argv)
   }
 
   FeatureDataIterator fi(featureFiles[0]);
+  //cerr << featureFiles[0] << endl;
   for (; fi != FeatureDataIterator::end(); ++fi) {
     const vector<FeatureDataItem>& featureData = *fi;
   }