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generator/parser/rpp/pp-engine.h  view on Meta::CPAN

/*
  Copyright 2005 Roberto Raggi <roberto@kdevelop.org>

  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  KDEVELOP TEAM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef PP_ENGINE_H
#define PP_ENGINE_H

//krazy:excludeall=inline

#include <QtCore/QHash>

#include <QtCore/QStack>

#include "../cppparser_export.h"
#include "../problem.h"

#include "pp-macro.h"
#include "pp-macro-expander.h"
#include "pp-scanner.h"

typedef QVector<unsigned int> PreprocessedContents;

namespace rpp {

class Preprocessor;
class Environment;

struct Value
{
  Value() : kind(Kind_Long), l(0) {}

  enum Kind {
    Kind_Long,
    Kind_ULong
  };

  Kind kind;

  union {
    long l;
    unsigned long ul;
  };

  inline bool is_ulong () const { return kind == Kind_ULong; }

  inline void set_ulong (unsigned long v)
  {
    ul = v;
    kind = Kind_ULong;
  }

  inline void set_long (long v)
  {
    l = v;
    kind = Kind_Long;
  }

  inline bool is_zero () const { return l == 0; }

#define PP_DEFINE_BIN_OP2(op) \
  inline Value operator op(const Value &other) \
  { \
    Value ret; \
    if (is_ulong () || other.is_ulong ()) \
      ret.set_ulong (ul op other.ul); \
    else \
      ret.set_long (l op other.l); \
    return ret; \
  }

#define PP_DEFINE_BIN_OP(op, op2) \
  inline Value &operator op2(const Value &other) \
  { \
    if (is_ulong () || other.is_ulong ()) \
      set_ulong (ul op other.ul); \
    else \
      set_long (l op other.l); \
    return *this; \
  }

  PP_DEFINE_BIN_OP(+, +=)
  PP_DEFINE_BIN_OP(-, -=)
  PP_DEFINE_BIN_OP(*, *=)
  PP_DEFINE_BIN_OP(/, /=)
  PP_DEFINE_BIN_OP(%, %=)
  PP_DEFINE_BIN_OP(<<, <<=)
  PP_DEFINE_BIN_OP(>>, >>=)
  PP_DEFINE_BIN_OP(&, &=)
  PP_DEFINE_BIN_OP(|, |=)
  PP_DEFINE_BIN_OP(^, ^=)
  PP_DEFINE_BIN_OP2(<)
  PP_DEFINE_BIN_OP2(>)
  PP_DEFINE_BIN_OP2(!=)
  PP_DEFINE_BIN_OP2(==)
  PP_DEFINE_BIN_OP2(<=)
  PP_DEFINE_BIN_OP2(>=)
  PP_DEFINE_BIN_OP2(&&)
  PP_DEFINE_BIN_OP2(||)

#undef PP_DEFINE_BIN_OP
};


class CPPPARSER_EXPORT pp
{
  Environment* m_environment;
  pp_macro_expander expand;
  pp_skip_identifier skip_identifier;
  pp_skip_comment_or_divop skip_comment_or_divop;
  pp_skip_blanks skip_blanks;
  pp_skip_number skip_number;
  QStack<IndexedString> m_files;
  Preprocessor* m_preprocessor;
  QList<Problem*> m_problems;

  enum { MAX_LEVEL = 512 };
  int _M_skipping[MAX_LEVEL];
  int _M_true_test[MAX_LEVEL];
  int iflevel;
  int nextToken;
  bool haveNextToken;
  bool hideNext;
  bool hadGuardCandidate, checkGuardEnd;
  IndexedString guardCandidate;

  union {
    long token_value;
    unsigned long token_uvalue;
  };
  IndexedString token_text;

  enum TOKEN_TYPE
  {
    TOKENS_START = 1000,
    TOKEN_NUMBER,
    TOKEN_UNUMBER,
    TOKEN_IDENTIFIER,
    TOKEN_DEFINED,
    TOKEN_LT_LT,
    TOKEN_LT_EQ,
    TOKEN_GT_GT,
    TOKEN_GT_EQ,
    TOKEN_EQ_EQ,
    TOKEN_NOT_EQ,
    TOKEN_OR_OR,
    TOKEN_AND_AND,
    TOKENS_END
  };

public:
  pp(Preprocessor* preprocessor);
  ~pp();

  Preprocessor* preprocessor();

  enum StringType { File, Data };

  ///@todo Remove
  inline QString currentFileNameString () const { return m_files.top().str(); }
  
  inline IndexedString currentFileName () const { return m_files.top(); }

  Value eval_expression (Stream& input);

  /** Read file @p fileName and preprocess
   *  Currently the file is expected to be utf8-encoded. */
  PreprocessedContents processFile(const QString& fileName);