cpp_token_buffer.cpp

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/*******************************************************************\
 
Module: C++ Parser: Token Buffer
 
Author: Daniel Kroening, kroening@cs.cmu.edu
 
\*******************************************************************/
 
 
#include "cpp_token_buffer.h"
 
int cpp_token_buffert::LookAhead(unsigned offset)
{
  PRECONDITION(current_pos <= token_vector.size());
 
  offset+=current_pos;
 
  while(offset>=token_vector.size())
    read_token();
 
  return token_vector[offset]->kind;
}
 
int cpp_token_buffert::get_token(cpp_tokent &token)
{
  PRECONDITION(current_pos <= token_vector.size());
 
  if(token_vector.size()==current_pos)
    read_token();
 
  token=*token_vector[current_pos];
 
  current_pos++;
 
  return token.kind;
}
 
int cpp_token_buffert::get_token()
{
  PRECONDITION(current_pos <= token_vector.size());
 
  if(token_vector.size()==current_pos)
    read_token();
 
  int kind=token_vector[current_pos]->kind;
 
  current_pos++;
 
  return kind;
}
 
int cpp_token_buffert::LookAhead(unsigned offset, cpp_tokent &token)
{
  PRECONDITION(current_pos <= token_vector.size());
 
  offset+=current_pos;
 
  while(offset>=token_vector.size())
    read_token();
 
  token=*token_vector[offset];
 
  return token.kind;
}
 
int yyansi_clex();
extern char *yyansi_ctext;
 
void cpp_token_buffert::read_token()
{
  tokens.push_back(cpp_tokent());
  token_vector.push_back(--tokens.end());
 
  int kind;
 
  ansi_c_parser.stack.clear();
  kind = yyansi_clex();
  tokens.back().text = yyansi_ctext;
  if(ansi_c_parser.stack.size()==1)
  {
    tokens.back().data=ansi_c_parser.stack.front();
    tokens.back().line_no=ansi_c_parser.get_line_no();
    tokens.back().filename=ansi_c_parser.get_file();
  }
 
  // std::cout << "TOKEN: " << kind << " " << tokens.back().text << '\n';
 
  tokens.back().kind=kind;
 
  // std::cout << "II: " << token_vector.back()->kind << '\n';
  // std::cout << "I2: " << token_vector.size() << '\n';
}
 
cpp_token_buffert::post cpp_token_buffert::Save()
{
  return current_pos;
}
 
void cpp_token_buffert::Restore(post pos)
{
  current_pos=pos;
}
 
void cpp_token_buffert::Replace(const cpp_tokent &token)
{
  PRECONDITION(current_pos <= token_vector.size());
 
  if(token_vector.size()==current_pos)
    read_token();
 
  *token_vector[current_pos]=token;
}
 
void cpp_token_buffert::Insert(const cpp_tokent &token)
{
  PRECONDITION(current_pos <= token_vector.size());
 
  tokens.push_back(token);
 
  token_vector.insert(token_vector.begin()+current_pos,
                      --tokens.end());
}