ref: 44c0e12d62ee9adcc37d7ff603232c29b9d90101
dir: /jsnumber.c/
#include "jsi.h" #include "jsvalue.h" #include "jsbuiltin.h" static void jsB_new_Number(js_State *J) { js_newnumber(J, js_gettop(J) > 1 ? js_tonumber(J, 1) : 0); } static void jsB_Number(js_State *J) { js_pushnumber(J, js_gettop(J) > 1 ? js_tonumber(J, 1) : 0); } static void Np_valueOf(js_State *J) { js_Object *self = js_toobject(J, 0); if (self->type != JS_CNUMBER) js_typeerror(J, "not a number"); js_pushnumber(J, self->u.number); } static void Np_toString(js_State *J) { char buf[32]; js_Object *self = js_toobject(J, 0); int radix = js_isundefined(J, 1) ? 10 : js_tointeger(J, 1); if (self->type != JS_CNUMBER) js_typeerror(J, "not a number"); if (radix < 2 || radix > 36) js_rangeerror(J, "invalid radix"); if (radix != 10) js_rangeerror(J, "invalid radix"); js_pushstring(J, jsV_numbertostring(J, buf, self->u.number)); } /* Customized ToString() on a number */ static void numtostr(js_State *J, const char *fmt, int w, double n) { char buf[32], *e; if (isnan(n)) js_pushliteral(J, "NaN"); else if (isinf(n)) js_pushliteral(J, n < 0 ? "-Infinity" : "Infinity"); else if (n == 0) js_pushliteral(J, "0"); else { if (w < 1) w = 1; if (w > 17) w = 17; sprintf(buf, fmt, w, n); e = strchr(buf, 'e'); if (e) { int exp = atoi(e+1); sprintf(e, "e%+d", exp); } js_pushstring(J, buf); } } static void Np_toFixed(js_State *J) { js_Object *self = js_toobject(J, 0); int width = js_tointeger(J, 1); if (self->type != JS_CNUMBER) js_typeerror(J, "not a number"); numtostr(J, "%.*f", width, self->u.number); } static void Np_toExponential(js_State *J) { js_Object *self = js_toobject(J, 0); int width = js_tointeger(J, 1); if (self->type != JS_CNUMBER) js_typeerror(J, "not a number"); numtostr(J, "%.*e", width, self->u.number); } static void Np_toPrecision(js_State *J) { js_Object *self = js_toobject(J, 0); int width = js_tointeger(J, 1); if (self->type != JS_CNUMBER) js_typeerror(J, "not a number"); numtostr(J, "%.*g", width, self->u.number); } void jsB_initnumber(js_State *J) { J->Number_prototype->u.number = 0; js_pushobject(J, J->Number_prototype); { jsB_propf(J, "valueOf", Np_valueOf, 0); jsB_propf(J, "toString", Np_toString, 1); jsB_propf(J, "toLocaleString", Np_toString, 0); jsB_propf(J, "toFixed", Np_toFixed, 1); jsB_propf(J, "toExponential", Np_toExponential, 1); jsB_propf(J, "toPrecision", Np_toPrecision, 1); } js_newcconstructor(J, jsB_Number, jsB_new_Number, "Number", 1); { jsB_propn(J, "MAX_VALUE", 1.7976931348623157e+308); jsB_propn(J, "MIN_VALUE", 5e-324); jsB_propn(J, "NaN", NAN); jsB_propn(J, "NEGATIVE_INFINITY", -INFINITY); jsB_propn(J, "POSITIVE_INFINITY", INFINITY); } js_defglobal(J, "Number", JS_DONTENUM); }