1 #include "jsi.h"
2 #include "jsvalue.h"
3 #include "jsbuiltin.h"
4
5 #if defined(_MSC_VER) && (_MSC_VER < 1700) /* VS2012 has stdint.h */
6 typedef unsigned __int64 uint64_t;
7 #else
8 #include <stdint.h>
9 #endif
10
jsB_new_Number(js_State * J)11 static void jsB_new_Number(js_State *J)
12 {
13 js_newnumber(J, js_gettop(J) > 1 ? js_tonumber(J, 1) : 0);
14 }
15
jsB_Number(js_State * J)16 static void jsB_Number(js_State *J)
17 {
18 js_pushnumber(J, js_gettop(J) > 1 ? js_tonumber(J, 1) : 0);
19 }
20
Np_valueOf(js_State * J)21 static void Np_valueOf(js_State *J)
22 {
23 js_Object *self = js_toobject(J, 0);
24 if (self->type != JS_CNUMBER) js_typeerror(J, "not a number");
25 js_pushnumber(J, self->u.number);
26 }
27
Np_toString(js_State * J)28 static void Np_toString(js_State *J)
29 {
30 char buf[100];
31 js_Object *self = js_toobject(J, 0);
32 int radix = js_isundefined(J, 1) ? 10 : js_tointeger(J, 1);
33 if (self->type != JS_CNUMBER)
34 js_typeerror(J, "not a number");
35 if (radix == 10) {
36 js_pushstring(J, jsV_numbertostring(J, buf, self->u.number));
37 return;
38 }
39 if (radix < 2 || radix > 36)
40 js_rangeerror(J, "invalid radix");
41
42 /* lame number to string conversion for any radix from 2 to 36 */
43 {
44 static const char digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
45 double number = self->u.number;
46 int sign = self->u.number < 0;
47 js_Buffer *sb = NULL;
48 uint64_t u, limit = ((uint64_t)1<<52);
49
50 int ndigits, exp, point;
51
52 if (number == 0) { js_pushstring(J, "0"); return; }
53 if (isnan(number)) { js_pushstring(J, "NaN"); return; }
54 if (isinf(number)) { js_pushstring(J, sign ? "-Infinity" : "Infinity"); return; }
55
56 if (sign)
57 number = -number;
58
59 /* fit as many digits as we want in an int */
60 exp = 0;
61 while (number * pow(radix, exp) > limit)
62 --exp;
63 while (number * pow(radix, exp+1) < limit)
64 ++exp;
65 u = number * pow(radix, exp) + 0.5;
66
67 /* trim trailing zeros */
68 while (u > 0 && (u % radix) == 0) {
69 u /= radix;
70 --exp;
71 }
72
73 /* serialize digits */
74 ndigits = 0;
75 while (u > 0) {
76 buf[ndigits++] = digits[u % radix];
77 u /= radix;
78 }
79 point = ndigits - exp;
80
81 if (js_try(J)) {
82 js_free(J, sb);
83 js_throw(J);
84 }
85
86 if (sign)
87 js_putc(J, &sb, '-');
88
89 if (point <= 0) {
90 js_putc(J, &sb, '0');
91 js_putc(J, &sb, '.');
92 while (point++ < 0)
93 js_putc(J, &sb, '0');
94 while (ndigits-- > 0)
95 js_putc(J, &sb, buf[ndigits]);
96 } else {
97 while (ndigits-- > 0) {
98 js_putc(J, &sb, buf[ndigits]);
99 if (--point == 0 && ndigits > 0)
100 js_putc(J, &sb, '.');
101 }
102 while (point-- > 0)
103 js_putc(J, &sb, '0');
104 }
105
106 js_putc(J, &sb, 0);
107 js_pushstring(J, sb->s);
108
109 js_endtry(J);
110 js_free(J, sb);
111 }
112 }
113
114 /* Customized ToString() on a number */
numtostr(js_State * J,const char * fmt,int w,double n)115 static void numtostr(js_State *J, const char *fmt, int w, double n)
116 {
117 /* buf needs to fit printf("%.20f", 1e20) */
118 char buf[50], *e;
119 sprintf(buf, fmt, w, n);
120 e = strchr(buf, 'e');
121 if (e) {
122 int exp = atoi(e+1);
123 sprintf(e, "e%+d", exp);
124 }
125 js_pushstring(J, buf);
126 }
127
Np_toFixed(js_State * J)128 static void Np_toFixed(js_State *J)
129 {
130 js_Object *self = js_toobject(J, 0);
131 int width = js_tointeger(J, 1);
132 char buf[32];
133 double x;
134 if (self->type != JS_CNUMBER) js_typeerror(J, "not a number");
135 if (width < 0) js_rangeerror(J, "precision %d out of range", width);
136 if (width > 20) js_rangeerror(J, "precision %d out of range", width);
137 x = self->u.number;
138 if (isnan(x) || isinf(x) || x <= -1e21 || x >= 1e21)
139 js_pushstring(J, jsV_numbertostring(J, buf, x));
140 else
141 numtostr(J, "%.*f", width, x);
142 }
143
Np_toExponential(js_State * J)144 static void Np_toExponential(js_State *J)
145 {
146 js_Object *self = js_toobject(J, 0);
147 int width = js_tointeger(J, 1);
148 char buf[32];
149 double x;
150 if (self->type != JS_CNUMBER) js_typeerror(J, "not a number");
151 if (width < 0) js_rangeerror(J, "precision %d out of range", width);
152 if (width > 20) js_rangeerror(J, "precision %d out of range", width);
153 x = self->u.number;
154 if (isnan(x) || isinf(x))
155 js_pushstring(J, jsV_numbertostring(J, buf, x));
156 else
157 numtostr(J, "%.*e", width, self->u.number);
158 }
159
Np_toPrecision(js_State * J)160 static void Np_toPrecision(js_State *J)
161 {
162 js_Object *self = js_toobject(J, 0);
163 int width = js_tointeger(J, 1);
164 char buf[32];
165 double x;
166 if (self->type != JS_CNUMBER) js_typeerror(J, "not a number");
167 if (width < 1) js_rangeerror(J, "precision %d out of range", width);
168 if (width > 21) js_rangeerror(J, "precision %d out of range", width);
169 x = self->u.number;
170 if (isnan(x) || isinf(x))
171 js_pushstring(J, jsV_numbertostring(J, buf, x));
172 else
173 numtostr(J, "%.*g", width, self->u.number);
174 }
175
jsB_initnumber(js_State * J)176 void jsB_initnumber(js_State *J)
177 {
178 J->Number_prototype->u.number = 0;
179
180 js_pushobject(J, J->Number_prototype);
181 {
182 jsB_propf(J, "Number.prototype.valueOf", Np_valueOf, 0);
183 jsB_propf(J, "Number.prototype.toString", Np_toString, 1);
184 jsB_propf(J, "Number.prototype.toLocaleString", Np_toString, 0);
185 jsB_propf(J, "Number.prototype.toFixed", Np_toFixed, 1);
186 jsB_propf(J, "Number.prototype.toExponential", Np_toExponential, 1);
187 jsB_propf(J, "Number.prototype.toPrecision", Np_toPrecision, 1);
188 }
189 js_newcconstructor(J, jsB_Number, jsB_new_Number, "Number", 0); /* 1 */
190 {
191 jsB_propn(J, "MAX_VALUE", 1.7976931348623157e+308);
192 jsB_propn(J, "MIN_VALUE", 5e-324);
193 jsB_propn(J, "NaN", NAN);
194 jsB_propn(J, "NEGATIVE_INFINITY", -INFINITY);
195 jsB_propn(J, "POSITIVE_INFINITY", INFINITY);
196 }
197 js_defglobal(J, "Number", JS_DONTENUM);
198 }
199