1#include "jsi.h"
2#include "jsvalue.h"
3#include "jsbuiltin.h"
4
5#include <time.h>
6
7#define JS_RAND_MAX (0x7fffffff)
8
9static unsigned int jsM_rand_temper(unsigned int x)
10{
11 x ^= x>>11;
12 x ^= x<<7 & 0x9D2C5680;
13 x ^= x<<15 & 0xEFC60000;
14 x ^= x>>18;
15 return x;
16}
17
18static int jsM_rand_r(unsigned int *seed)
19{
20 return jsM_rand_temper(*seed = *seed * 1103515245 + 12345)/2;
21}
22
23static double jsM_round(double x)
24{
25 if (isnan(x)) return x;
26 if (isinf(x)) return x;
27 if (x == 0) return x;
28 if (x > 0 && x < 0.5) return 0;
29 if (x < 0 && x >= -0.5) return -0;
30 return floor(x + 0.5);
31}
32
33static void Math_abs(js_State *J)
34{
35 js_pushnumber(J, fabs(js_tonumber(J, 1)));
36}
37
38static void Math_acos(js_State *J)
39{
40 js_pushnumber(J, acos(js_tonumber(J, 1)));
41}
42
43static void Math_asin(js_State *J)
44{
45 js_pushnumber(J, asin(js_tonumber(J, 1)));
46}
47
48static void Math_atan(js_State *J)
49{
50 js_pushnumber(J, atan(js_tonumber(J, 1)));
51}
52
53static void Math_atan2(js_State *J)
54{
55 double y = js_tonumber(J, 1);
56 double x = js_tonumber(J, 2);
57 js_pushnumber(J, atan2(y, x));
58}
59
60static void Math_ceil(js_State *J)
61{
62 js_pushnumber(J, ceil(js_tonumber(J, 1)));
63}
64
65static void Math_cos(js_State *J)
66{
67 js_pushnumber(J, cos(js_tonumber(J, 1)));
68}
69
70static void Math_exp(js_State *J)
71{
72 js_pushnumber(J, exp(js_tonumber(J, 1)));
73}
74
75static void Math_floor(js_State *J)
76{
77 js_pushnumber(J, floor(js_tonumber(J, 1)));
78}
79
80static void Math_log(js_State *J)
81{
82 js_pushnumber(J, log(js_tonumber(J, 1)));
83}
84
85static void Math_pow(js_State *J)
86{
87 double x = js_tonumber(J, 1);
88 double y = js_tonumber(J, 2);
89 if (!isfinite(y) && fabs(x) == 1)
90 js_pushnumber(J, NAN);
91 else
92 js_pushnumber(J, pow(x,y));
93}
94
95static void Math_random(js_State *J)
96{
97 js_pushnumber(J, jsM_rand_r(&J->seed) / (JS_RAND_MAX + 1.0));
98}
99
100static void Math_round(js_State *J)
101{
102 double x = js_tonumber(J, 1);
103 js_pushnumber(J, jsM_round(x));
104}
105
106static void Math_sin(js_State *J)
107{
108 js_pushnumber(J, sin(js_tonumber(J, 1)));
109}
110
111static void Math_sqrt(js_State *J)
112{
113 js_pushnumber(J, sqrt(js_tonumber(J, 1)));
114}
115
116static void Math_tan(js_State *J)
117{
118 js_pushnumber(J, tan(js_tonumber(J, 1)));
119}
120
121static void Math_max(js_State *J)
122{
123 int i, n = js_gettop(J);
124 double x = -INFINITY;
125 for (i = 1; i < n; ++i) {
126 double y = js_tonumber(J, i);
127 if (isnan(y)) {
128 x = y;
129 break;
130 }
131 if (signbit(x) == signbit(y))
132 x = x > y ? x : y;
133 else if (signbit(x))
134 x = y;
135 }
136 js_pushnumber(J, x);
137}
138
139static void Math_min(js_State *J)
140{
141 int i, n = js_gettop(J);
142 double x = INFINITY;
143 for (i = 1; i < n; ++i) {
144 double y = js_tonumber(J, i);
145 if (isnan(y)) {
146 x = y;
147 break;
148 }
149 if (signbit(x) == signbit(y))
150 x = x < y ? x : y;
151 else if (signbit(y))
152 x = y;
153 }
154 js_pushnumber(J, x);
155}
156
157void jsB_initmath(js_State *J)
158{
159 J->seed = time(NULL);
160
161 js_pushobject(J, jsV_newobject(J, JS_CMATH, J->Object_prototype));
162 {
163 jsB_propn(J, "E", 2.7182818284590452354);
164 jsB_propn(J, "LN10", 2.302585092994046);
165 jsB_propn(J, "LN2", 0.6931471805599453);
166 jsB_propn(J, "LOG2E", 1.4426950408889634);
167 jsB_propn(J, "LOG10E", 0.4342944819032518);
168 jsB_propn(J, "PI", 3.1415926535897932);
169 jsB_propn(J, "SQRT1_2", 0.7071067811865476);
170 jsB_propn(J, "SQRT2", 1.4142135623730951);
171
172 jsB_propf(J, "Math.abs", Math_abs, 1);
173 jsB_propf(J, "Math.acos", Math_acos, 1);
174 jsB_propf(J, "Math.asin", Math_asin, 1);
175 jsB_propf(J, "Math.atan", Math_atan, 1);
176 jsB_propf(J, "Math.atan2", Math_atan2, 2);
177 jsB_propf(J, "Math.ceil", Math_ceil, 1);
178 jsB_propf(J, "Math.cos", Math_cos, 1);
179 jsB_propf(J, "Math.exp", Math_exp, 1);
180 jsB_propf(J, "Math.floor", Math_floor, 1);
181 jsB_propf(J, "Math.log", Math_log, 1);
182 jsB_propf(J, "Math.max", Math_max, 0); /* 2 */
183 jsB_propf(J, "Math.min", Math_min, 0); /* 2 */
184 jsB_propf(J, "Math.pow", Math_pow, 2);
185 jsB_propf(J, "Math.random", Math_random, 0);
186 jsB_propf(J, "Math.round", Math_round, 1);
187 jsB_propf(J, "Math.sin", Math_sin, 1);
188 jsB_propf(J, "Math.sqrt", Math_sqrt, 1);
189 jsB_propf(J, "Math.tan", Math_tan, 1);
190 }
191 js_defglobal(J, "Math", JS_DONTENUM);
192}
193