summaryrefslogtreecommitdiffstats
path: root/kjs/math_object.cpp
blob: 6ad8289b0b85d09f2434e51a6490d162b8217e9b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
// -*- c-basic-offset: 2 -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <time.h>

#include "value.h"
#include "object.h"
#include "types.h"
#include "interpreter.h"
#include "operations.h"
#include "math_object.h"

#include "math_object.lut.h"

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif  /*  M_PI  */

#ifndef signbit
#define signbit(x) ((x) < 0.0 || IS_NEGATIVE_ZERO(x))
#endif

using namespace KJS;

// ------------------------------ MathObjectImp --------------------------------

const ClassInfo MathObjectImp::info = { "Math", 0, &mathTable, 0 };

/* Source for math_object.lut.h
@begin mathTable 31
  E             MathObjectImp::Euler    DontEnum|DontDelete|ReadOnly
  LN2           MathObjectImp::Ln2      DontEnum|DontDelete|ReadOnly
  LN10          MathObjectImp::Ln10     DontEnum|DontDelete|ReadOnly
  LOG2E         MathObjectImp::Log2E    DontEnum|DontDelete|ReadOnly
  LOG10E        MathObjectImp::Log10E   DontEnum|DontDelete|ReadOnly
  PI            MathObjectImp::Pi       DontEnum|DontDelete|ReadOnly
  SQRT1_2       MathObjectImp::Sqrt1_2  DontEnum|DontDelete|ReadOnly
  SQRT2         MathObjectImp::Sqrt2    DontEnum|DontDelete|ReadOnly
  abs           MathObjectImp::Abs      DontEnum|Function 1
  acos          MathObjectImp::ACos     DontEnum|Function 1
  asin          MathObjectImp::ASin     DontEnum|Function 1
  atan          MathObjectImp::ATan     DontEnum|Function 1
  atan2         MathObjectImp::ATan2    DontEnum|Function 2
  ceil          MathObjectImp::Ceil     DontEnum|Function 1
  cos           MathObjectImp::Cos      DontEnum|Function 1
  exp           MathObjectImp::Exp      DontEnum|Function 1
  floor         MathObjectImp::Floor    DontEnum|Function 1
  log           MathObjectImp::Log      DontEnum|Function 1
  max           MathObjectImp::Max      DontEnum|Function 2
  min           MathObjectImp::Min      DontEnum|Function 2
  pow           MathObjectImp::Pow      DontEnum|Function 2
  random        MathObjectImp::Random   DontEnum|Function 0
  round         MathObjectImp::Round    DontEnum|Function 1
  sin           MathObjectImp::Sin      DontEnum|Function 1
  sqrt          MathObjectImp::Sqrt     DontEnum|Function 1
  tan           MathObjectImp::Tan      DontEnum|Function 1
@end
*/

MathObjectImp::MathObjectImp(ExecState * /*exec*/,
                             ObjectPrototypeImp *objProto)
  : ObjectImp(objProto)
{
   unsigned int seed = time(NULL);
   ::srand(seed);
}

// ECMA 15.8
Value MathObjectImp::get(ExecState *exec, const Identifier &propertyName) const
{
  return lookupGet<MathFuncImp, MathObjectImp, ObjectImp>( exec, propertyName, &mathTable, this );
}

Value MathObjectImp::getValueProperty(ExecState *, int token) const
{
  double d = -42; // ;)
  switch (token) {
  case Euler:
    d = exp(1.0);
    break;
  case Ln2:
    d = log(2.0);
    break;
  case Ln10:
    d = log(10.0);
    break;
  case Log2E:
    d = 1.0/log(2.0);
    break;
  case Log10E:
    d = 1.0/log(10.0);
    break;
  case Pi:
    d = M_PI;
    break;
  case Sqrt1_2:
    d = sqrt(0.5);
    break;
  case Sqrt2:
    d = sqrt(2.0);
    break;
  default:
    fprintf( stderr, "Internal error in MathObjectImp: unhandled token %d\n", token );
    break;
  }

  return Number(d);
}

// ------------------------------ MathObjectImp --------------------------------

MathFuncImp::MathFuncImp(ExecState *exec, int i, int l)
  : InternalFunctionImp(
    static_cast<FunctionPrototypeImp*>(exec->lexicalInterpreter()->builtinFunctionPrototype().imp())
    ), id(i)
{
  Value protect(this);
  putDirect(lengthPropertyName, l, DontDelete|ReadOnly|DontEnum);
}

bool MathFuncImp::implementsCall() const
{
  return true;
}

Value MathFuncImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
{
  double arg = args[0].toNumber(exec);
  double arg2 = args[1].toNumber(exec);
  double result;

  switch (id) {
  case MathObjectImp::Abs:
    result = ( arg < 0 || arg == -0) ? (-arg) : arg;
    break;
  case MathObjectImp::ACos:
    result = ::acos(arg);
    break;
  case MathObjectImp::ASin:
    result = ::asin(arg);
    break;
  case MathObjectImp::ATan:
    result = ::atan(arg);
    break;
  case MathObjectImp::ATan2:
    result = ::atan2(arg, arg2);
    break;
  case MathObjectImp::Ceil:
    result = ::ceil(arg);
    break;
  case MathObjectImp::Cos:
    result = ::cos(arg);
    break;
  case MathObjectImp::Exp:
    result = ::exp(arg);
    break;
  case MathObjectImp::Floor:
    result = ::floor(arg);
    break;
  case MathObjectImp::Log:
    result = ::log(arg);
    break;
  case MathObjectImp::Max: {
    unsigned int argsCount = args.size();
    result = -Inf;
    for ( unsigned int k = 0 ; k < argsCount ; ++k ) {
      double val = args[k].toNumber(exec);
      if ( isNaN( val ) )
      {
        result = NaN;
        break;
      }
      if ( val > result || (val == 0 && result == 0 && !signbit(val)) )
        result = val;
    }
    break;
  }
  case MathObjectImp::Min: {
    unsigned int argsCount = args.size();
    result = +Inf;
    for ( unsigned int k = 0 ; k < argsCount ; ++k ) {
      double val = args[k].toNumber(exec);
      if ( isNaN( val ) )
      {
        result = NaN;
        break;
      }
      if ( val < result || (val == 0 && result == 0 && signbit(val)) )
        result = val;
    }
    break;
  }
  case MathObjectImp::Pow:
    // ECMA 15.8.2.1.13 (::pow takes care of most of the critera)
    if (KJS::isNaN(arg2))
      result = NaN;
#ifndef APPLE_CHANGES
    else if (arg2 == 0)
      result = 1;
#endif
    else if (KJS::isNaN(arg) && arg2 != 0)
      result = NaN;
#ifndef APPLE_CHANGES
    else if (::fabs(arg) > 1 && KJS::isPosInf(arg2))
      result = Inf;
    else if (::fabs(arg) > 1 && KJS::isNegInf(arg2))
      result = +0;
#endif
    else if (::fabs(arg) == 1 && KJS::isInf(arg2))
      result = NaN;
#ifndef APPLE_CHANGES
    else if (::fabs(arg) < 1 && KJS::isPosInf(arg2))
      result = +0;
    else if (::fabs(arg) < 1 && KJS::isNegInf(arg2))
      result = Inf;
#endif
    else
      result = ::pow(arg, arg2);
    break;
  case MathObjectImp::Random:
    result = ::rand();
    result = result / RAND_MAX;
    break;
  case MathObjectImp::Round:
    if (signbit(arg) && arg >= -0.5)
        result = -0.0;
    else
        result = ::floor(arg + 0.5);
    break;
  case MathObjectImp::Sin:
    result = ::sin(arg);
    break;
  case MathObjectImp::Sqrt:
    result = ::sqrt(arg);
    break;
  case MathObjectImp::Tan:
    result = ::tan(arg);
    break;

  default:
    result = 0.0;
    assert(0);
  }

  return Number(result);
}