ginac/parser/parse_context.cpp

   1 #include "parse_context.h"
   2 #include <sstream>
   3 #include <stdexcept>
   4 namespace GiNaC
   5 {
   6
   7 symbol
   8 find_or_insert_symbol(const std::string& name, symtab& syms, const bool strict)
   9 {
  10         symtab::const_iterator p = syms.find(name);
  11         if (p != syms.end()) {
  12                 if (is_a<symbol>(p->second))
  13                         return ex_to<symbol>(p->second);
  14                 else
  15                         throw std::invalid_argument(
  16                                 std::string("find_or_insert_symbol: name \"")
  17                                 + name + "\" does not correspond to a symbol");
  18         }
  19
  20
  21         if (strict)
  22                 throw std::invalid_argument(
  23                                 std::string("find_or_insert_symbol: symbol \"")
  24                                 + name + "\" not found");
  25
  26         const symbol sy(name);
  27         syms[name] = sy;
  28         return sy;
  29 }
  30
  31 }
  32