#line 1 "hb-number-parser.rl"

/*

 * Copyright © 2019  Ebrahim Byagowi

 *

 *  This is part of HarfBuzz, a text shaping library.

 *

 * Permission is hereby granted, without written agreement and without

 * license or royalty fees, to use, copy, modify, and distribute this

 * software and its documentation for any purpose, provided that the

 * above copyright notice and the following two paragraphs appear in

 * all copies of this software.

 *

 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR

 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN

 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 *

 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,

 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS

 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO

 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 *

 */

#ifndef HB_NUMBER_PARSER_HH

#define HB_NUMBER_PARSER_HH

#include "hb.hh"

#line 32 "hb-number-parser.hh"

static const unsigned char _double_parser_trans_keys[] = {

  0u, 0u, 43u, 57u, 46u, 57u, 48u, 57u, 43u, 57u, 48u, 57u, 48u, 101u, 48u, 57u, 

  46u, 101u, 0

};

static const char _double_parser_key_spans[] = {

  0, 15, 12, 10, 15, 10, 54, 10, 

  56

};

static const unsigned char _double_parser_index_offsets[] = {

  0, 0, 16, 29, 40, 56, 67, 122, 

  133

};

static const char _double_parser_indicies[] = {

  0, 1, 2, 3, 1, 4, 4, 

  4, 4, 4, 4, 4, 4, 4, 4, 

  1, 3, 1, 4, 4, 4, 4, 4, 

  4, 4, 4, 4, 4, 1, 5, 5, 

  5, 5, 5, 5, 5, 5, 5, 5, 

  1, 6, 1, 7, 1, 1, 8, 8, 

  8, 8, 8, 8, 8, 8, 8, 8, 

  1, 8, 8, 8, 8, 8, 8, 8, 

  8, 8, 8, 1, 5, 5, 5, 5, 

  5, 5, 5, 5, 5, 5, 1, 1, 

  1, 1, 1, 1, 1, 1, 1, 1, 

  1, 9, 1, 1, 1, 1, 1, 1, 

  1, 1, 1, 1, 1, 1, 1, 1, 

  1, 1, 1, 1, 1, 1, 1, 1, 

  1, 1, 1, 1, 1, 1, 1, 1, 

  1, 9, 1, 8, 8, 8, 8, 8, 

  8, 8, 8, 8, 8, 1, 3, 1, 

  4, 4, 4, 4, 4, 4, 4, 4, 

  4, 4, 1, 1, 1, 1, 1, 1, 

  1, 1, 1, 1, 1, 9, 1, 1, 

  1, 1, 1, 1, 1, 1, 1, 1, 

  1, 1, 1, 1, 1, 1, 1, 1, 

  1, 1, 1, 1, 1, 1, 1, 1, 

  1, 1, 1, 1, 1, 9, 1, 0

};

static const char _double_parser_trans_targs[] = {

  2, 0, 2, 3, 8, 6, 5, 5, 

  7, 4

};

static const char _double_parser_trans_actions[] = {

  0, 0, 1, 0, 2, 3, 0, 4, 

  5, 0

};

static const int double_parser_start = 1;

static const int double_parser_first_final = 6;

static const int double_parser_error = 0;

static const int double_parser_en_main = 1;

#line 68 "hb-number-parser.rl"

/* Works only for n < 512 */

static inline double

_pow10 (unsigned exponent)

{

  static const double _powers_of_10[] =

  {

    1.0e+256,

    1.0e+128,

    1.0e+64,

    1.0e+32,

    1.0e+16,

    1.0e+8,

    10000.,

    100.,

    10.

  };

  unsigned mask = 1 << (ARRAY_LENGTH (_powers_of_10) - 1);

  double result = 1;

  for (const double *power = _powers_of_10; mask; ++power, mask >>= 1)

    if (exponent & mask) result *= *power;

  return result;

}

/* a variant of strtod that also gets end of buffer in its second argument */

static inline double

strtod_rl (const char *p, const char **end_ptr /* IN/OUT */)

{

  double value = 0;

  double frac = 0;

  double frac_count = 0;

  unsigned exp = 0;

  bool neg = false, exp_neg = false, exp_overflow = false;

  const unsigned long long MAX_FRACT = 0xFFFFFFFFFFFFFull; /* 2^52-1 */

  const unsigned MAX_EXP = 0x7FFu; /* 2^11-1 */

  const char *pe = *end_ptr;

  while (p < pe && ISSPACE (*p))

    p++;

  int cs;

#line 132 "hb-number-parser.hh"

  {

  cs = double_parser_start;

  }

#line 135 "hb-number-parser.hh"

  {

  int _slen;

  int _trans;

  const unsigned char *_keys;

  const char *_inds;

  if ( p == pe )

    goto _test_eof;

  if ( cs == 0 )

    goto _out;

_resume:

  _keys = _double_parser_trans_keys + (cs<<1);

  _inds = _double_parser_indicies + _double_parser_index_offsets[cs];

  _slen = _double_parser_key_spans[cs];

  _trans = _inds[ _slen > 0 && _keys[0] <=(*p) &&

    (*p) <= _keys[1] ?

    (*p) - _keys[0] : _slen ];

  cs = _double_parser_trans_targs[_trans];

  if ( _double_parser_trans_actions[_trans] == 0 )

    goto _again;

  switch ( _double_parser_trans_actions[_trans] ) {

  case 1:

#line 37 "hb-number-parser.rl"

  { neg = true; }

  break;

  case 4:

#line 38 "hb-number-parser.rl"

  { exp_neg = true; }

  break;

  case 2:

#line 40 "hb-number-parser.rl"

  {

  value = value * 10. + ((*p) - '0');

}

  break;

  case 3:

#line 43 "hb-number-parser.rl"

  {

  if (likely (frac <= MAX_FRACT / 10))

  {

    frac = frac * 10. + ((*p) - '0');

    ++frac_count;

  }

}

  break;

  case 5:

#line 50 "hb-number-parser.rl"

  {

  if (likely (exp * 10 + ((*p) - '0') <= MAX_EXP))

    exp = exp * 10 + ((*p) - '0');

  else

    exp_overflow = true;

}

  break;

#line 187 "hb-number-parser.hh"

  }

_again:

  if ( cs == 0 )

    goto _out;

  if ( ++p != pe )

    goto _resume;

  _test_eof: {}

  _out: {}

  }

#line 113 "hb-number-parser.rl"

  *end_ptr = p;

  if (frac_count) value += frac / _pow10 (frac_count);

  if (neg) value *= -1.;

  if (unlikely (exp_overflow))

  {

    if (value == 0) return value;

    if (exp_neg)    return neg ? -DBL_MIN : DBL_MIN;

    else            return neg ? -DBL_MAX : DBL_MAX;

  }

  if (exp)

  {

    if (exp_neg) value /= _pow10 (exp);

    else         value *= _pow10 (exp);

  }

  return value;

}

#endif /* HB_NUMBER_PARSER_HH */