From c150bdea83a9f599b34832072a70af525e40b77a Mon Sep 17 00:00:00 2001
From: "trevor.cohn" <trevor.cohn@ec762483-ff6d-05da-a07a-a48fb63a330f>
Date: Sun, 18 Jul 2010 20:40:27 +0000
Subject: Changed to UTF8

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@311 ec762483-ff6d-05da-a07a-a48fb63a330f
---
 extools/extractor_monolingual.cc | 196 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 196 insertions(+)
 create mode 100644 extools/extractor_monolingual.cc

(limited to 'extools/extractor_monolingual.cc')

diff --git a/extools/extractor_monolingual.cc b/extools/extractor_monolingual.cc
new file mode 100644
index 00000000..5db768e3
--- /dev/null
+++ b/extools/extractor_monolingual.cc
@@ -0,0 +1,196 @@
+#include <iostream>
+#include <vector>
+#include <utility>
+#include <tr1/unordered_map>
+
+#include <boost/functional/hash.hpp>
+#include <boost/program_options.hpp>
+#include <boost/program_options/variables_map.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include "tdict.h"
+#include "fdict.h"
+#include "wordid.h"
+#include "filelib.h"
+
+using namespace std;
+using namespace std::tr1;
+namespace po = boost::program_options;
+
+static const size_t MAX_LINE_LENGTH = 100000;
+WordID kBOS, kEOS, kDIVIDER, kGAP;
+int kCOUNT;
+
+void InitCommandLine(int argc, char** argv, po::variables_map* conf) {
+  po::options_description opts("Configuration options");
+  opts.add_options()
+        ("input,i", po::value<string>()->default_value("-"), "Input file")
+        ("phrases,p", po::value<string>(), "File contatining phrases of interest")
+        ("phrase_context_size,S", po::value<int>()->default_value(2), "Use this many words of context on left and write when writing base phrase contexts")
+        ("silent", "Write nothing to stderr except errors")
+        ("help,h", "Print this help message and exit");
+  po::options_description clo("Command line options");
+  po::options_description dcmdline_options;
+  dcmdline_options.add(opts);
+
+  po::store(parse_command_line(argc, argv, dcmdline_options), *conf);
+  po::notify(*conf);
+
+  if (conf->count("help") || conf->count("input") != 1 || conf->count("phrases") != 1) {
+    cerr << "\nUsage: extractor_monolingual [-options]\n";
+    cerr << dcmdline_options << endl;
+    exit(1);
+  }
+}
+
+struct TrieNode
+{
+  TrieNode(int l) : finish(false), length(l) {};
+  ~TrieNode()
+  {
+    for (unordered_map<int, TrieNode*>::iterator
+         it = next.begin(); it != next.end(); ++it)
+      delete it->second;
+    next.clear();
+  }
+
+  TrieNode *follow(int token)
+  {
+    unordered_map<int, TrieNode*>::iterator
+      found = next.find(token);
+    if (found != next.end())
+      return found->second;
+    else
+      return 0;
+  }
+
+  void insert(const vector<int> &tokens)
+  {
+    insert(tokens.begin(), tokens.end());
+  }
+
+  void insert(vector<int>::const_iterator begin, vector<int>::const_iterator end)
+  {
+    if (begin == end)
+      finish = true;
+    else
+    {
+      int token = *begin;
+      unordered_map<int, TrieNode*>::iterator 
+        nit = next.find(token);
+      if (nit == next.end())
+        nit = next.insert(make_pair(token, new TrieNode(length+1))).first;
+      ++begin;
+      nit->second->insert(begin, end);
+    }
+  }
+
+  bool finish;
+  int length;
+  unordered_map<int, TrieNode*> next;
+};
+
+void WriteContext(const vector<int>& sentence, int start, int end, int ctx_size) 
+{
+  for (int i = start; i < end; ++i)
+  {
+    if (i != start) cout << " ";
+    cout << sentence[i];
+  }
+  cout << '\t';
+  for (int i = ctx_size; i > 0; --i)
+    cout << TD::Convert(sentence[start-i]) << " ";
+  cout << " " << TD::Convert(kGAP);
+  for (int i = 0; i < ctx_size; ++i)
+    cout << " " << TD::Convert(sentence[end+i]);
+  cout << "\n";
+}
+
+inline bool IsWhitespace(char c) { 
+    return c == ' ' || c == '\t'; 
+}
+
+inline void SkipWhitespace(const char* buf, int* ptr) {
+  while (buf[*ptr] && IsWhitespace(buf[*ptr])) { ++(*ptr); }
+}
+
+vector<int> ReadSentence(const char *buf, int padding)
+{
+  int ptr = 0;
+  SkipWhitespace(buf, &ptr);
+  int start = ptr;
+  vector<int> sentence;
+  for (int i = 0; i < padding; ++i)
+    sentence.push_back(kBOS);
+
+  while (char c = buf[ptr])
+  {
+    if (!IsWhitespace(c)) 
+      ++ptr; 
+    else {
+      sentence.push_back(TD::Convert(string(buf, start, ptr-start)));
+      SkipWhitespace(buf, &ptr);
+      start = ptr;
+    }
+  }
+  for (int i = 0; i < padding; ++i)
+    sentence.push_back(kEOS);
+
+  return sentence;
+}
+
+int main(int argc, char** argv) 
+{
+  po::variables_map conf;
+  InitCommandLine(argc, argv, &conf);
+  kBOS = TD::Convert("<s>");
+  kEOS = TD::Convert("</s>");
+  kDIVIDER = TD::Convert("|||");
+  kGAP = TD::Convert("<PHRASE>");
+  kCOUNT = FD::Convert("C");
+
+  bool silent = conf.count("silent") > 0;
+  const int ctx_size = conf["phrase_context_size"].as<int>();
+
+  char buf[MAX_LINE_LENGTH];
+  TrieNode phrase_trie(0);
+  ReadFile rpf(conf["phrases"].as<string>());
+  istream& pin = *rpf.stream();
+  while (pin) {
+      pin.getline(buf, MAX_LINE_LENGTH);
+      phrase_trie.insert(ReadSentence(buf, 0));
+  }
+
+  ReadFile rif(conf["input"].as<string>());
+  istream &iin = *rif.stream();
+  int line = 0;
+  while (iin) {
+    ++line;
+    iin.getline(buf, MAX_LINE_LENGTH);
+    if (buf[0] == 0) continue;
+    if (!silent) {
+      if (line % 200 == 0) cerr << '.';
+      if (line % 8000 == 0) cerr << " [" << line << "]\n" << flush;
+    }
+
+    vector<int> sentence = ReadSentence(buf, ctx_size);
+    vector<TrieNode*> tries(1, &phrase_trie);
+    for (int i = ctx_size; i < (int)sentence.size() - ctx_size; ++i)
+    {
+      vector<TrieNode*> tries_prime(1, &phrase_trie);
+      for (vector<TrieNode*>::iterator tit = tries.begin(); tit != tries.end(); ++tit)
+      {
+        TrieNode* next = (*tit)->follow(sentence[i]);
+        if (next != 0)
+        {
+          if (next->finish)
+            WriteContext(sentence, i - next->length, i, ctx_size);
+          tries_prime.push_back(next);
+        }
+      }
+      swap(tries, tries_prime);
+    }
+  }
+  if (!silent) cerr << endl;
+  return 0;
+}
-- 
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