/*************************************************

*      Perl-Compatible Regular Expressions       *

*************************************************/

/* PCRE is a library of functions to support regular expressions whose syntax

and semantics are as close as possible to those of the Perl 5 language.

                       Written by Philip Hazel

     Original API code Copyright (c) 1997-2012 University of Cambridge

          New API code Copyright (c) 2016-2023 University of Cambridge

-----------------------------------------------------------------------------

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,

      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright

      notice, this list of conditions and the following disclaimer in the

      documentation and/or other materials provided with the distribution.

    * Neither the name of the University of Cambridge nor the names of its

      contributors may be used to endorse or promote products derived from

      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

-----------------------------------------------------------------------------

*/

/* This module contains an internal function that is used to match an extended

class. It is used by pcre2_auto_possessify() and by both pcre2_match() and

pcre2_def_match(). */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "pcre2_internal.h"

/*************************************************

*       Match character against an XCLASS        *

*************************************************/

/* This function is called to match a character against an extended class that

might contain codepoints above 255 and/or Unicode properties.

Arguments:

  c           the character

  data        points to the flag code unit of the XCLASS data

  utf         TRUE if in UTF mode

Returns:      TRUE if character matches, else FALSE

*/

BOOL

PRIV(xclass)(uint32_t c, PCRE2_SPTR data, BOOL utf)

{

PCRE2_UCHAR t;

BOOL negated = (*data & XCL_NOT) != 0;

#if PCRE2_CODE_UNIT_WIDTH == 8

/* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */

utf = TRUE;

#endif

/* Code points < 256 are matched against a bitmap, if one is present. If not,

we still carry on, because there may be ranges that start below 256 in the

additional data. */

if (c < 256)

  {

  if ((*data & XCL_HASPROP) == 0)

    {

    if ((*data & XCL_MAP) == 0) return negated;

    return (((uint8_t *)(data + 1))[c/8] & (1u << (c&7))) != 0;

    }

  if ((*data & XCL_MAP) != 0 &&

    (((uint8_t *)(data + 1))[c/8] & (1u << (c&7))) != 0)

    return !negated; /* char found */

  }

/* First skip the bit map if present. Then match against the list of Unicode

properties or large chars or ranges that end with a large char. We won't ever

encounter XCL_PROP or XCL_NOTPROP when UTF support is not compiled. */

if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(PCRE2_UCHAR);

while ((t = *data++) != XCL_END)

  {

  uint32_t x, y;

  if (t == XCL_SINGLE)

    {

#ifdef SUPPORT_UNICODE

    if (utf)

      {

      GETCHARINC(x, data); /* macro generates multiple statements */

      }

    else

#endif

    x = *data++;

    if (c == x) return !negated;

    }

  else if (t == XCL_RANGE)

    {

#ifdef SUPPORT_UNICODE

    if (utf)

      {

      GETCHARINC(x, data); /* macro generates multiple statements */

      GETCHARINC(y, data); /* macro generates multiple statements */

      }

    else

#endif

      {

      x = *data++;

      y = *data++;

      }

    if (c >= x && c <= y) return !negated;

    }

#ifdef SUPPORT_UNICODE

  else  /* XCL_PROP & XCL_NOTPROP */

    {

    int chartype;

    const ucd_record *prop = GET_UCD(c);

    BOOL isprop = t == XCL_PROP;

    BOOL ok;

    switch(*data)

      {

      case PT_ANY:

      if (isprop) return !negated;

      break;

      case PT_LAMP:

      chartype = prop->chartype;

      if ((chartype == ucp_Lu || chartype == ucp_Ll ||

           chartype == ucp_Lt) == isprop) return !negated;

      break;

      case PT_GC:

      if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)

        return !negated;

      break;

      case PT_PC:

      if ((data[1] == prop->chartype) == isprop) return !negated;

      break;

      case PT_SC:

      if ((data[1] == prop->script) == isprop) return !negated;

      break;

      case PT_SCX:

      ok = (data[1] == prop->script ||

            MAPBIT(PRIV(ucd_script_sets) + UCD_SCRIPTX_PROP(prop), data[1]) != 0);

      if (ok == isprop) return !negated;

      break;

      case PT_ALNUM:

      chartype = prop->chartype;

      if ((PRIV(ucp_gentype)[chartype] == ucp_L ||

           PRIV(ucp_gentype)[chartype] == ucp_N) == isprop)

        return !negated;

      break;

      /* Perl space used to exclude VT, but from Perl 5.18 it is included,

      which means that Perl space and POSIX space are now identical. PCRE

      was changed at release 8.34. */

      case PT_SPACE:    /* Perl space */

      case PT_PXSPACE:  /* POSIX space */

      switch(c)

        {

        HSPACE_CASES:

        VSPACE_CASES:

        if (isprop) return !negated;

        break;

        default:

        if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)

          return !negated;

        break;

        }

      break;

      case PT_WORD:

      chartype = prop->chartype;

      if ((PRIV(ucp_gentype)[chartype] == ucp_L ||

           PRIV(ucp_gentype)[chartype] == ucp_N ||

           chartype == ucp_Mn || chartype == ucp_Pc) == isprop)

        return !negated;

      break;

      case PT_UCNC:

      if (c < 0xa0)

        {

        if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||

             c == CHAR_GRAVE_ACCENT) == isprop)

          return !negated;

        }

      else

        {

        if ((c < 0xd800 || c > 0xdfff) == isprop)

          return !negated;

        }

      break;

      case PT_BIDICL:

      if ((UCD_BIDICLASS_PROP(prop) == data[1]) == isprop)

        return !negated;

      break;

      case PT_BOOL:

      ok = MAPBIT(PRIV(ucd_boolprop_sets) +

        UCD_BPROPS_PROP(prop), data[1]) != 0;

      if (ok == isprop) return !negated;

      break;

      /* The following three properties can occur only in an XCLASS, as there

      is no \p or \P coding for them. */

      /* Graphic character. Implement this as not Z (space or separator) and

      not C (other), except for Cf (format) with a few exceptions. This seems

      to be what Perl does. The exceptional characters are:

      U+061C           Arabic Letter Mark

      U+180E           Mongolian Vowel Separator

      U+2066 - U+2069  Various "isolate"s

      */

      case PT_PXGRAPH:

      chartype = prop->chartype;

      if ((PRIV(ucp_gentype)[chartype] != ucp_Z &&

            (PRIV(ucp_gentype)[chartype] != ucp_C ||

              (chartype == ucp_Cf &&

                c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))

         )) == isprop)

        return !negated;

      break;

      /* Printable character: same as graphic, with the addition of Zs, i.e.

      not Zl and not Zp, and U+180E. */

      case PT_PXPRINT:

      chartype = prop->chartype;

      if ((chartype != ucp_Zl &&

           chartype != ucp_Zp &&

            (PRIV(ucp_gentype)[chartype] != ucp_C ||

              (chartype == ucp_Cf &&

                c != 0x061c && (c < 0x2066 || c > 0x2069))

         )) == isprop)

        return !negated;

      break;

      /* Punctuation: all Unicode punctuation, plus ASCII characters that

      Unicode treats as symbols rather than punctuation, for Perl

      compatibility (these are $+<=>^`|~). */

      case PT_PXPUNCT:

      chartype = prop->chartype;

      if ((PRIV(ucp_gentype)[chartype] == ucp_P ||

            (c < 128 && PRIV(ucp_gentype)[chartype] == ucp_S)) == isprop)

        return !negated;

      break;

      /* Perl has two sets of hex digits */

      case PT_PXXDIGIT:

      if (((c >= CHAR_0 && c <= CHAR_9) ||

           (c >= CHAR_A && c <= CHAR_F) ||

           (c >= CHAR_a && c <= CHAR_f) ||

           (c >= 0xff10 && c <= 0xff19) ||  /* Fullwidth digits */

           (c >= 0xff21 && c <= 0xff26) ||  /* Fullwidth letters */

           (c >= 0xff41 && c <= 0xff46)) == isprop)

        return !negated;

      break;

      /* This should never occur, but compilers may mutter if there is no

      default. */

      default:

      return FALSE;

      }

    data += 2;

    }

#else

  (void)utf;  /* Avoid compiler warning */

#endif  /* SUPPORT_UNICODE */

  }

return negated;   /* char did not match */

}

/* End of pcre2_xclass.c */