common/cfg_process_utils.hh

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Copyright (c) 2000-2014 Ericsson Telecom AB
   3 // All rights reserved. This program and the accompanying materials
   4 // are made available under the terms of the Eclipse Public License v1.0
   5 // which accompanies this distribution, and is available at
   6 // http://www.eclipse.org/legal/epl-v10.html
   7 ///////////////////////////////////////////////////////////////////////////////
   8 #ifndef CFG_PROCESS_UTILS_HH_
   9 #define CFG_PROCESS_UTILS_HH_
  10
  11
  12 #include <deque>
  13 #include <string>
  14
  15 #include "Path2.hh"
  16
  17 template <typename T_BUFFER_STATE>
  18 class IncludeElem {
  19 public:
  20   std::string dir;
  21   std::string fname;
  22   FILE* fp;
  23   T_BUFFER_STATE buffer_state;
  24   int line_number;
  25
  26
  27   IncludeElem(const std::string& fname_)
  28     : dir(Path::get_dir(fname_)), fname(Path::get_file(fname_)),
  29       fp(NULL), buffer_state(NULL), line_number(-1) { }
  30
  31   IncludeElem(const std::string& fname_, FILE* fp_)
  32     : dir(Path::get_dir(fname_)), fname(Path::get_file(fname_)),
  33       fp(fp_), buffer_state(NULL), line_number(-1) { }
  34
  35   bool equals(const std::string& path) const {
  36     return Path::compose(dir, fname) == path;
  37   }
  38
  39   std::string get_full_path() const {
  40     return Path::compose(dir, fname);
  41   }
  42
  43 };
  44
  45 template <typename T_BUFFER_STATE>
  46 std::string dump_include_chain(const std::deque<IncludeElem<T_BUFFER_STATE> >& chain) {
  47
  48   std::string result;
  49   if (chain.empty()) {
  50     return result;
  51   }
  52
  53   typename std::deque<IncludeElem<T_BUFFER_STATE> >::const_iterator it = chain.begin();
  54   result.append(it->dir).append(it->fname);
  55   for (++it; it != chain.end(); ++it) {
  56     result.append("->");
  57     result.append(it->dir).append(it->fname);
  58   }
  59   return result;
  60 }
  61
  62 template <typename T_BUFFER_STATE>
  63 std::string switch_lexer(std::deque<IncludeElem<T_BUFFER_STATE> >* p_include_chain,
  64     const std::string& include_file, T_BUFFER_STATE p_current_buffer,
  65     T_BUFFER_STATE (*p_yy_create_buffer)(FILE*, int),
  66     void (*p_yy_switch_to_buffer)(T_BUFFER_STATE),
  67     int p_current_line, int p_buf_size) {
  68
  69   if (include_file.empty()) {
  70     return std::string("Empty file name.");
  71   }
  72
  73   std::string abs_path;
  74   if (Path::is_absolute(include_file)) {
  75     abs_path = include_file;
  76   } else {
  77     abs_path = Path::normalize(Path::compose(p_include_chain->back().dir, include_file));
  78   }
  79
  80   for (typename std::deque<IncludeElem<T_BUFFER_STATE> >::iterator it = p_include_chain->begin();
  81       it != p_include_chain->end(); ++it) {
  82     if (it->equals(abs_path)) {
  83       p_include_chain->push_back(IncludeElem<T_BUFFER_STATE>(abs_path));
  84       std::string error_msg("Circular import chain detected:\n");
  85       error_msg.append(dump_include_chain(*p_include_chain));
  86       p_include_chain->pop_back();
  87       return error_msg;
  88     }
  89   }
  90
  91   p_include_chain->back().buffer_state = p_current_buffer;
  92   p_include_chain->back().line_number = p_current_line;
  93
  94   FILE* fp = fopen(abs_path.c_str(), "r");
  95   if (!fp) {
  96     std::string error_msg("File not found: ");
  97     error_msg.append(abs_path);
  98     return error_msg;
  99   }
 100
 101   IncludeElem<T_BUFFER_STATE> new_elem(abs_path, fp);
 102   p_include_chain->push_back(new_elem);
 103   new_elem.buffer_state = p_yy_create_buffer(fp, p_buf_size);
 104   p_yy_switch_to_buffer(new_elem.buffer_state);
 105   return std::string("");
 106 }
 107
 108 #endif