src/interface/gdb/StringFollower.cpp

   1 #include <sstream>
   2
   3 #include "StringFollower.h"
   4
   5 #include "misc/String.h"
   6
   7 namespace Aesalon {
   8 namespace Interface {
   9 namespace GDB {
  10
  11 std::string StringFollower::follow(std::string path) {
  12     std::stringstream stream;
  13     stream << path;
  14
  15     std::string token;
  16
  17     while(stream >> token) {
  18         if(token[0] == '[') { /* list element */
  19             if(token[token.length()-1] != ']') {
  20                 throw StringFollowerInvalidPathException("Expected terminating ']' at end of token");
  21             }
  22             int number;
  23             Misc::String::to<int>(token.substr(1, token.length()-2), number);
  24
  25             data = data.to<ParseList>()->get_element(number);
  26         }
  27         else if(token[0] == '\'') { /* tuple element */
  28             if(token[token.length()-1] != '\'') {
  29                 throw StringFollowerInvalidPathException("Expected terminating \' at end of token");
  30             }
  31             std::string key = token.substr(1, token.length()-2);
  32             data = data.to<ParseTuple>()->get_element(key);
  33         }
  34         else if(token[0] == '\"') { /* tuple element */
  35             if(token[token.length()-1] != '\"') {
  36                 throw StringFollowerInvalidPathException("Expected terminating \" at end of token");
  37             }
  38             std::string key = token.substr(1, token.length()-2);
  39             data = data.to<ParseTuple>()->get_element(key);
  40         }
  41         else if(token == "lhs") { /* left side of a result */
  42             data = new ParseString(data.to<ParseResult>()->get_name());
  43         }
  44         else if(token == "rhs") { /* right side of a result */
  45             Misc::SmartPointer<ParseResult> result = data.to<ParseResult>();
  46             data = result->get_value();
  47         }
  48
  49         if(!data.is_valid()) throw StringFollowerException("NULL value in StringFollower resolution");
  50     }
  51
  52     return data.to<ParseString>()->get_data();
  53 }
  54
  55 } // namespace GDB
  56 } // namespace Interface
  57 } // namespace Aesalon