1 files changed, 156 insertions, 0 deletions
diff --git a/extractor/data_array.cc b/extractor/data_array.cc
new file mode 100644
index 00000000..cd430c69
--- /dev/null
+++ b/extractor/data_array.cc
@@ -0,0 +1,156 @@
+#include "data_array.h"
+
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <string>
+
+#include <boost/filesystem.hpp>
+
+namespace fs = boost::filesystem;
+using namespace std;
+
+int DataArray::NULL_WORD = 0;
+int DataArray::END_OF_LINE = 1;
+string DataArray::NULL_WORD_STR = "__NULL__";
+string DataArray::END_OF_LINE_STR = "__END_OF_LINE__";
+
+DataArray::DataArray() {
+  InitializeDataArray();
+}
+
+DataArray::DataArray(const string& filename) {
+  InitializeDataArray();
+  ifstream infile(filename.c_str());
+  vector<string> lines;
+  string line;
+  while (getline(infile, line)) {
+    lines.push_back(line);
+  }
+  CreateDataArray(lines);
+}
+
+DataArray::DataArray(const string& filename, const Side& side) {
+  InitializeDataArray();
+  ifstream infile(filename.c_str());
+  vector<string> lines;
+  string line, delimiter = "|||";
+  while (getline(infile, line)) {
+    int position = line.find(delimiter);
+    if (side == SOURCE) {
+      lines.push_back(line.substr(0, position));
+    } else {
+      lines.push_back(line.substr(position + delimiter.size()));
+    }
+  }
+  CreateDataArray(lines);
+}
+
+void DataArray::InitializeDataArray() {
+  word2id[NULL_WORD_STR] = NULL_WORD;
+  id2word.push_back(NULL_WORD_STR);
+  word2id[END_OF_LINE_STR] = END_OF_LINE;
+  id2word.push_back(END_OF_LINE_STR);
+}
+
+void DataArray::CreateDataArray(const vector<string>& lines) {
+  for (size_t i = 0; i < lines.size(); ++i) {
+    sentence_start.push_back(data.size());
+
+    istringstream iss(lines[i]);
+    string word;
+    while (iss >> word) {
+      if (word2id.count(word) == 0) {
+        word2id[word] = id2word.size();
+        id2word.push_back(word);
+      }
+      data.push_back(word2id[word]);
+      sentence_id.push_back(i);
+    }
+    data.push_back(END_OF_LINE);
+    sentence_id.push_back(i);
+  }
+  sentence_start.push_back(data.size());
+
+  data.shrink_to_fit();
+  sentence_id.shrink_to_fit();
+  sentence_start.shrink_to_fit();
+}
+
+DataArray::~DataArray() {}
+
+const vector<int>& DataArray::GetData() const {
+  return data;
+}
+
+int DataArray::AtIndex(int index) const {
+  return data[index];
+}
+
+string DataArray::GetWordAtIndex(int index) const {
+  return id2word[data[index]];
+}
+
+int DataArray::GetSize() const {
+  return data.size();
+}
+
+int DataArray::GetVocabularySize() const {
+  return id2word.size();
+}
+
+int DataArray::GetNumSentences() const {
+  return sentence_start.size() - 1;
+}
+
+int DataArray::GetSentenceStart(int position) const {
+  return sentence_start[position];
+}
+
+int DataArray::GetSentenceLength(int sentence_id) const {
+  // Ignore end of line markers.
+  return sentence_start[sentence_id + 1] - sentence_start[sentence_id] - 1;
+}
+
+int DataArray::GetSentenceId(int position) const {
+  return sentence_id[position];
+}
+
+void DataArray::WriteBinary(const fs::path& filepath) const {
+  WriteBinary(fopen(filepath.string().c_str(), "w"));
+}
+
+void DataArray::WriteBinary(FILE* file) const {
+  int size = id2word.size();
+  fwrite(&size, sizeof(int), 1, file);
+  for (string word: id2word) {
+    size = word.size();
+    fwrite(&size, sizeof(int), 1, file);
+    fwrite(word.data(), sizeof(char), size, file);
+  }
+
+  size = data.size();
+  fwrite(&size, sizeof(int), 1, file);
+  fwrite(data.data(), sizeof(int), size, file);
+
+  size = sentence_id.size();
+  fwrite(&size, sizeof(int), 1, file);
+  fwrite(sentence_id.data(), sizeof(int), size, file);
+
+  size = sentence_start.size();
+  fwrite(&size, sizeof(int), 1, file);
+  fwrite(sentence_start.data(), sizeof(int), 1, file);
+}
+
+bool DataArray::HasWord(const string& word) const {
+  return word2id.count(word);
+}
+
+int DataArray::GetWordId(const string& word) const {
+  auto result = word2id.find(word);
+  return result == word2id.end() ? -1 : result->second;
+}
+
+string DataArray::GetWord(int word_id) const {
+  return id2word[word_id];
+}