idl.re

Boost provides free peer-reviewed portable C++ source libraries. We emphasize libraries that work

/*=============================================================================
    Boost.Wave: A Standard compliant C++ preprocessor library

    Sample: IDL lexer 

    http://www.boost.org/

    Copyright (c) 2001-2008 Hartmut Kaiser. Distributed under the Boost
    Software License, Version 1.0. (See accompanying file
    LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/

#include <ctime>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <boost/config.hpp>

#if defined(BOOST_HAS_UNISTD_H)
#include <unistd.h>
#else
#include <io.h>
#endif 

#include <boost/assert.hpp>
#include <boost/detail/workaround.hpp>

// reuse the token ids and re2c helper functions from the default C++ lexer
#include <boost/wave/token_ids.hpp>
#include <boost/wave/cpplexer/re2clex/aq.hpp>
#include <boost/wave/cpplexer/re2clex/scanner.hpp>
#include <boost/wave/cpplexer/cpplexer_exceptions.hpp>

#include "idl_re.hpp"

#if defined(_MSC_VER) && !defined(__COMO__)
#pragma warning (disable: 4101)     // 'foo' : unreferenced local variable
#pragma warning (disable: 4102)     // 'foo' : unreferenced label
#endif

#define BOOST_WAVE_BSIZE     196608

#define YYCTYPE   uchar
#define YYCURSOR  cursor
#define YYLIMIT   s->lim
#define YYMARKER  s->ptr
#define YYFILL(n) {cursor = fill(s, cursor);}

//#define BOOST_WAVE_RET(i)    {s->cur = cursor; return (i);}
#define BOOST_WAVE_RET(i)    \
    { \
        s->line += count_backslash_newlines(s, cursor); \
        s->cur = cursor; \
        return (i); \
    } \
    /**/

///////////////////////////////////////////////////////////////////////////////
namespace boost {
namespace wave {
namespace idllexer {
namespace re2clex {

#define RE2C_ASSERT BOOST_ASSERT

int 
get_one_char(boost::wave::cpplexer::re2clex::Scanner *s)
{
    using namespace boost::wave::cpplexer::re2clex;
    if (0 != s->act) {
        RE2C_ASSERT(s->first != 0 && s->last != 0);
        RE2C_ASSERT(s->first <= s->act && s->act <= s->last);
        if (s->act < s->last) 
            return *(s->act)++;
    }
    return -1;
}

std::ptrdiff_t 
rewind_stream (boost::wave::cpplexer::re2clex::Scanner *s, int cnt)
{
    if (0 != s->act) {
        RE2C_ASSERT(s->first != 0 && s->last != 0);
        s->act += cnt;
        RE2C_ASSERT(s->first <= s->act && s->act <= s->last);
        return s->act - s->first;
    }
    return 0;
}

std::size_t 
get_first_eol_offset(boost::wave::cpplexer::re2clex::Scanner* s)
{
    if (!AQ_EMPTY(s->eol_offsets))
    {
        return s->eol_offsets->queue[s->eol_offsets->head];
    }
    else
    {
        return (unsigned int)-1;
    }
}

void 
adjust_eol_offsets(boost::wave::cpplexer::re2clex::Scanner* s, 
    std::size_t adjustment)
{
    boost::wave::cpplexer::re2clex::aq_queue q;
    std::size_t i;
    
    if (!s->eol_offsets)
        s->eol_offsets = boost::wave::cpplexer::re2clex::aq_create();

    q = s->eol_offsets;

    if (AQ_EMPTY(q))
        return;

    i = q->head;
    while (i != q->tail)
    {
        if (adjustment > q->queue[i])
            q->queue[i] = 0;
        else
            q->queue[i] -= adjustment;
        ++i;
        if (i == q->max_size)
            i = 0;
    }
    if (adjustment > q->queue[i])
        q->queue[i] = 0;
    else
        q->queue[i] -= adjustment;
}

int 
count_backslash_newlines(boost::wave::cpplexer::re2clex::Scanner *s, 
    boost::wave::cpplexer::re2clex::uchar *cursor)
{
    using namespace boost::wave::cpplexer::re2clex;

    std::size_t diff, offset;
    int skipped = 0;
    
    /* figure out how many backslash-newlines skipped over unknowingly. */
    diff = cursor - s->bot;
    offset = get_first_eol_offset(s);
    while (offset <= diff && offset != (unsigned int)-1)
    {
        skipped++;
        boost::wave::cpplexer::re2clex::aq_pop(s->eol_offsets);
        offset = get_first_eol_offset(s);
    }
    return skipped;
}

bool is_backslash(
  boost::wave::cpplexer::re2clex::uchar *p, 
  boost::wave::cpplexer::re2clex::uchar *end, int &len)
{
    if (*p == '\\') {
        len = 1;
        return true;
    }
    else if (*p == '?' && *(p+1) == '?' && (p+2 < end && *(p+2) == '/')) {
        len = 3;
        return true;
    }
    return false;
}

boost::wave::cpplexer::re2clex::uchar *
fill(boost::wave::cpplexer::re2clex::Scanner *s, 
    boost::wave::cpplexer::re2clex::uchar *cursor)
{
    using namespace std;    // some systems have memcpy etc. in namespace std
    using namespace boost::wave::cpplexer::re2clex;

    if(!s->eof)
    {
        uchar* p;
        std::ptrdiff_t cnt = s->tok - s->bot;
        if(cnt)
        {
            memcpy(s->bot, s->tok, s->lim - s->tok);
            s->tok = s->bot;
            s->ptr -= cnt;
            cursor -= cnt;
            s->lim -= cnt;
            adjust_eol_offsets(s, cnt);
        }

        if((s->top - s->lim) < BOOST_WAVE_BSIZE)
        {
            uchar *buf = (uchar*) malloc(((s->lim - s->bot) + BOOST_WAVE_BSIZE)*sizeof(uchar));
            if (buf == 0)
            {
                using namespace std;      // some systems have printf in std
                if (0 != s->error_proc) {
                    (*s->error_proc)(s, 
                        cpplexer::lexing_exception::unexpected_error,
                        "Out of memory!");
                }
                else 
                    printf("Out of memory!\n");
                    
                /* get the scanner to stop */
                *cursor = 0;
                return cursor;
            }

            memcpy(buf, s->tok, s->lim - s->tok);
            s->tok = buf;
            s->ptr = &buf[s->ptr - s->bot];
            cursor = &buf[cursor - s->bot];
            s->lim = &buf[s->lim - s->bot];
            s->top = &s->lim[BOOST_WAVE_BSIZE];
            free(s->bot);
            s->bot = buf;
        }

        if (s->act != 0) {
            cnt = s->last - s->act;
            if (cnt > BOOST_WAVE_BSIZE)
                cnt = BOOST_WAVE_BSIZE;
            memcpy(s->lim, s->act, cnt);
            s->act += cnt;
            if (cnt != BOOST_WAVE_BSIZE) 
            {
                s->eof = &s->lim[cnt]; *(s->eof)++ = '\0';
            }
        }
        
        /* backslash-newline erasing time */

        /* first scan for backslash-newline and erase them */
        for (p = s->lim; p < s->lim + cnt - 2; ++p)
        {
            int len = 0;
            if (is_backslash(p, s->lim + cnt, len))
            {
                if (*(p+len) == '\n')
                {
                    int offset = len + 1;
                    memmove(p, p + offset, s->lim + cnt - p - offset);
                    cnt -= offset;
                    --p;
                    aq_enqueue(s->eol_offsets, p - s->bot + 1);    
                }
                else if (*(p+len) == '\r')
                {
                    if (*(p+len+1) == '\n')
                    {
                        int offset = len + 2;
                        memmove(p, p + offset, s->lim + cnt - p - offset);
                        cnt -= offset;
                        --p;
                    }
                    else
                    {
                        int offset = len + 1;
                        memmove(p, p + offset, s->lim + cnt - p - offset);
                        cnt -= offset;
                        --p;
                    }
                    aq_enqueue(s->eol_offsets, p - s->bot + 1);    
                }
            }
        }

        /* FIXME: the following code should be fixed to recognize correctly the 
                  trigraph backslash token */

        /* check to see if what we just read ends in a backslash */
        if (cnt >= 2)
        {
            uchar last = s->lim[cnt-1];
            uchar last2 = s->lim[cnt-2];
            /* check \ EOB */
            if (last == '\\')
            {
                int next = get_one_char(s);
                /* check for \ \n or \ \r or \ \r \n straddling the border */
                if (next == '\n')
                {
                    --cnt; /* chop the final \, we've already read the \n. */
                    boost::wave::cpplexer::re2clex::aq_enqueue(s->eol_offsets, 
                        cnt + (s->lim - s->bot));    
                }
                else if (next == '\r')
                {