common/cfg_process_utils.hh

   1 /******************************************************************************
   2  * Copyright (c) 2000-2016 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  * Contributors:
   9  *   Balasko, Jeno
  10  *   Beres, Szabolcs
  11  *
  12  ******************************************************************************/
  13 #ifndef CFG_PROCESS_UTILS_HH_
  14 #define CFG_PROCESS_UTILS_HH_
  15
  16
  17 #include <deque>
  18 #include <string>
  19
  20 #include "Path2.hh"
  21
  22 template <typename T_BUFFER_STATE>
  23 class IncludeElem {
  24 public:
  25   std::string dir;
  26   std::string fname;
  27   FILE* fp;
  28   T_BUFFER_STATE buffer_state;
  29   int line_number;
  30
  31
  32   IncludeElem(const std::string& fname_)
  33     : dir(Path::get_dir(fname_)), fname(Path::get_file(fname_)),
  34       fp(NULL), buffer_state(NULL), line_number(-1) { }
  35
  36   IncludeElem(const std::string& fname_, FILE* fp_)
  37     : dir(Path::get_dir(fname_)), fname(Path::get_file(fname_)),
  38       fp(fp_), buffer_state(NULL), line_number(-1) { }
  39
  40   bool equals(const std::string& path) const {
  41     return Path::compose(dir, fname) == path;
  42   }
  43
  44   std::string get_full_path() const {
  45     return Path::compose(dir, fname);
  46   }
  47
  48 };
  49
  50 template <typename T_BUFFER_STATE>
  51 std::string dump_include_chain(const std::deque<IncludeElem<T_BUFFER_STATE> >& chain) {
  52
  53   std::string result;
  54   if (chain.empty()) {
  55     return result;
  56   }
  57
  58   typename std::deque<IncludeElem<T_BUFFER_STATE> >::const_iterator it = chain.begin();
  59   result.append(it->dir).append(it->fname);
  60   for (++it; it != chain.end(); ++it) {
  61     result.append("->");
  62     result.append(it->dir).append(it->fname);
  63   }
  64   return result;
  65 }
  66
  67 template <typename T_BUFFER_STATE>
  68 std::string switch_lexer(std::deque<IncludeElem<T_BUFFER_STATE> >* p_include_chain,
  69     const std::string& include_file, T_BUFFER_STATE p_current_buffer,
  70     T_BUFFER_STATE (*p_yy_create_buffer)(FILE*, int),
  71     void (*p_yy_switch_to_buffer)(T_BUFFER_STATE),
  72     int p_current_line, int p_buf_size) {
  73
  74   if (include_file.empty()) {
  75     return std::string("Empty file name.");
  76   }
  77
  78   std::string abs_path;
  79   if (Path::is_absolute(include_file)) {
  80     abs_path = include_file;
  81   } else {
  82     abs_path = Path::normalize(Path::compose(p_include_chain->back().dir, include_file));
  83   }
  84
  85   for (typename std::deque<IncludeElem<T_BUFFER_STATE> >::iterator it = p_include_chain->begin();
  86       it != p_include_chain->end(); ++it) {
  87     if (it->equals(abs_path)) {
  88       p_include_chain->push_back(IncludeElem<T_BUFFER_STATE>(abs_path));
  89       std::string error_msg("Circular import chain detected:\n");
  90       error_msg.append(dump_include_chain(*p_include_chain));
  91       p_include_chain->pop_back();
  92       return error_msg;
  93     }
  94   }
  95
  96   p_include_chain->back().buffer_state = p_current_buffer;
  97   p_include_chain->back().line_number = p_current_line;
  98
  99   FILE* fp = fopen(abs_path.c_str(), "r");
 100   if (!fp) {
 101     std::string error_msg("File not found: ");
 102     error_msg.append(abs_path);
 103     return error_msg;
 104   }
 105
 106   IncludeElem<T_BUFFER_STATE> new_elem(abs_path, fp);
 107   p_include_chain->push_back(new_elem);
 108   new_elem.buffer_state = p_yy_create_buffer(fp, p_buf_size);
 109   p_yy_switch_to_buffer(new_elem.buffer_state);
 110   return std::string("");
 111 }
 112
 113 #endif