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eBookReaderSwitch/mupdf/thirdparty/mujs/jsvalue.c

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#include "jsi.h"
#include "jslex.h"
#include "jscompile.h"
#include "jsvalue.h"
#include "utf.h"
#define JSV_ISSTRING(v) (v->type==JS_TSHRSTR || v->type==JS_TMEMSTR || v->type==JS_TLITSTR)
#define JSV_TOSTRING(v) (v->type==JS_TSHRSTR ? v->u.shrstr : v->type==JS_TLITSTR ? v->u.litstr : v->type==JS_TMEMSTR ? v->u.memstr->p : "")
int jsV_numbertointeger(double n)
{
if (n == 0) return 0;
if (isnan(n)) return 0;
n = (n < 0) ? -floor(-n) : floor(n);
if (n < INT_MIN) return INT_MIN;
if (n > INT_MAX) return INT_MAX;
return (int)n;
}
int jsV_numbertoint32(double n)
{
double two32 = 4294967296.0;
double two31 = 2147483648.0;
if (!isfinite(n) || n == 0)
return 0;
n = fmod(n, two32);
n = n >= 0 ? floor(n) : ceil(n) + two32;
if (n >= two31)
return n - two32;
else
return n;
}
unsigned int jsV_numbertouint32(double n)
{
return (unsigned int)jsV_numbertoint32(n);
}
short jsV_numbertoint16(double n)
{
return jsV_numbertoint32(n);
}
unsigned short jsV_numbertouint16(double n)
{
return jsV_numbertoint32(n);
}
/* obj.toString() */
static int jsV_toString(js_State *J, js_Object *obj)
{
js_pushobject(J, obj);
js_getproperty(J, -1, "toString");
if (js_iscallable(J, -1)) {
js_rot2(J);
js_call(J, 0);
if (js_isprimitive(J, -1))
return 1;
js_pop(J, 1);
return 0;
}
js_pop(J, 2);
return 0;
}
/* obj.valueOf() */
static int jsV_valueOf(js_State *J, js_Object *obj)
{
js_pushobject(J, obj);
js_getproperty(J, -1, "valueOf");
if (js_iscallable(J, -1)) {
js_rot2(J);
js_call(J, 0);
if (js_isprimitive(J, -1))
return 1;
js_pop(J, 1);
return 0;
}
js_pop(J, 2);
return 0;
}
/* ToPrimitive() on a value */
void jsV_toprimitive(js_State *J, js_Value *v, int preferred)
{
js_Object *obj;
if (v->type != JS_TOBJECT)
return;
obj = v->u.object;
if (preferred == JS_HNONE)
preferred = obj->type == JS_CDATE ? JS_HSTRING : JS_HNUMBER;
if (preferred == JS_HSTRING) {
if (jsV_toString(J, obj) || jsV_valueOf(J, obj)) {
*v = *js_tovalue(J, -1);
js_pop(J, 1);
return;
}
} else {
if (jsV_valueOf(J, obj) || jsV_toString(J, obj)) {
*v = *js_tovalue(J, -1);
js_pop(J, 1);
return;
}
}
if (J->strict)
js_typeerror(J, "cannot convert object to primitive");
v->type = JS_TLITSTR;
v->u.litstr = "[object]";
return;
}
/* ToBoolean() on a value */
int jsV_toboolean(js_State *J, js_Value *v)
{
switch (v->type) {
default:
case JS_TSHRSTR: return v->u.shrstr[0] != 0;
case JS_TUNDEFINED: return 0;
case JS_TNULL: return 0;
case JS_TBOOLEAN: return v->u.boolean;
case JS_TNUMBER: return v->u.number != 0 && !isnan(v->u.number);
case JS_TLITSTR: return v->u.litstr[0] != 0;
case JS_TMEMSTR: return v->u.memstr->p[0] != 0;
case JS_TOBJECT: return 1;
}
}
const char *js_itoa(char *out, int v)
{
char buf[32], *s = out;
unsigned int a;
int i = 0;
if (v < 0) {
a = -v;
*s++ = '-';
} else {
a = v;
}
while (a) {
buf[i++] = (a % 10) + '0';
a /= 10;
}
if (i == 0)
buf[i++] = '0';
while (i > 0)
*s++ = buf[--i];
*s = 0;
return out;
}
double js_stringtofloat(const char *s, char **ep)
{
char *end;
double n;
const char *e = s;
int isflt = 0;
if (*e == '+' || *e == '-') ++e;
while (*e >= '0' && *e <= '9') ++e;
if (*e == '.') { ++e; isflt = 1; }
while (*e >= '0' && *e <= '9') ++e;
if (*e == 'e' || *e == 'E') {
++e;
if (*e == '+' || *e == '-') ++e;
while (*e >= '0' && *e <= '9') ++e;
isflt = 1;
}
if (isflt || e - s > 9)
n = js_strtod(s, &end);
else
n = strtol(s, &end, 10);
if (end == e) {
*ep = (char*)e;
return n;
}
*ep = (char*)s;
return 0;
}
/* ToNumber() on a string */
double jsV_stringtonumber(js_State *J, const char *s)
{
char *e;
double n;
while (jsY_iswhite(*s) || jsY_isnewline(*s)) ++s;
if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X') && s[2] != 0)
n = strtol(s + 2, &e, 16);
else if (!strncmp(s, "Infinity", 8))
n = INFINITY, e = (char*)s + 8;
else if (!strncmp(s, "+Infinity", 9))
n = INFINITY, e = (char*)s + 9;
else if (!strncmp(s, "-Infinity", 9))
n = -INFINITY, e = (char*)s + 9;
else
n = js_stringtofloat(s, &e);
while (jsY_iswhite(*e) || jsY_isnewline(*e)) ++e;
if (*e) return NAN;
return n;
}
/* ToNumber() on a value */
double jsV_tonumber(js_State *J, js_Value *v)
{
switch (v->type) {
default:
case JS_TSHRSTR: return jsV_stringtonumber(J, v->u.shrstr);
case JS_TUNDEFINED: return NAN;
case JS_TNULL: return 0;
case JS_TBOOLEAN: return v->u.boolean;
case JS_TNUMBER: return v->u.number;
case JS_TLITSTR: return jsV_stringtonumber(J, v->u.litstr);
case JS_TMEMSTR: return jsV_stringtonumber(J, v->u.memstr->p);
case JS_TOBJECT:
jsV_toprimitive(J, v, JS_HNUMBER);
return jsV_tonumber(J, v);
}
}
double jsV_tointeger(js_State *J, js_Value *v)
{
return jsV_numbertointeger(jsV_tonumber(J, v));
}
/* ToString() on a number */
const char *jsV_numbertostring(js_State *J, char buf[32], double f)
{
char digits[32], *p = buf, *s = digits;
int exp, ndigits, point;
if (f == 0) return "0";
if (isnan(f)) return "NaN";
if (isinf(f)) return f < 0 ? "-Infinity" : "Infinity";
/* Fast case for integers. This only works assuming all integers can be
* exactly represented by a float. This is true for 32-bit integers and
* 64-bit floats. */
if (f >= INT_MIN && f <= INT_MAX) {
int i = (int)f;
if ((double)i == f)
return js_itoa(buf, i);
}
ndigits = js_grisu2(f, digits, &exp);
point = ndigits + exp;
if (signbit(f))
*p++ = '-';
if (point < -5 || point > 21) {
*p++ = *s++;
if (ndigits > 1) {
int n = ndigits - 1;
*p++ = '.';
while (n--)
*p++ = *s++;
}
js_fmtexp(p, point - 1);
}
else if (point <= 0) {
*p++ = '0';
*p++ = '.';
while (point++ < 0)
*p++ = '0';
while (ndigits-- > 0)
*p++ = *s++;
*p = 0;
}
else {
while (ndigits-- > 0) {
*p++ = *s++;
if (--point == 0 && ndigits > 0)
*p++ = '.';
}
while (point-- > 0)
*p++ = '0';
*p = 0;
}
return buf;
}
/* ToString() on a value */
const char *jsV_tostring(js_State *J, js_Value *v)
{
char buf[32];
const char *p;
switch (v->type) {
default:
case JS_TSHRSTR: return v->u.shrstr;
case JS_TUNDEFINED: return "undefined";
case JS_TNULL: return "null";
case JS_TBOOLEAN: return v->u.boolean ? "true" : "false";
case JS_TLITSTR: return v->u.litstr;
case JS_TMEMSTR: return v->u.memstr->p;
case JS_TNUMBER:
p = jsV_numbertostring(J, buf, v->u.number);
if (p == buf) {
int n = strlen(p);
if (n <= soffsetof(js_Value, type)) {
char *s = v->u.shrstr;
while (n--) *s++ = *p++;
*s = 0;
v->type = JS_TSHRSTR;
return v->u.shrstr;
} else {
v->type = JS_TMEMSTR;
v->u.memstr = jsV_newmemstring(J, p, n);
return v->u.memstr->p;
}
}
return p;
case JS_TOBJECT:
jsV_toprimitive(J, v, JS_HSTRING);
return jsV_tostring(J, v);
}
}
/* Objects */
static js_Object *jsV_newboolean(js_State *J, int v)
{
js_Object *obj = jsV_newobject(J, JS_CBOOLEAN, J->Boolean_prototype);
obj->u.boolean = v;
return obj;
}
static js_Object *jsV_newnumber(js_State *J, double v)
{
js_Object *obj = jsV_newobject(J, JS_CNUMBER, J->Number_prototype);
obj->u.number = v;
return obj;
}
static js_Object *jsV_newstring(js_State *J, const char *v)
{
js_Object *obj = jsV_newobject(J, JS_CSTRING, J->String_prototype);
obj->u.s.string = js_intern(J, v); /* TODO: js_String */
obj->u.s.length = utflen(v);
return obj;
}
/* ToObject() on a value */
js_Object *jsV_toobject(js_State *J, js_Value *v)
{
switch (v->type) {
default:
case JS_TSHRSTR: return jsV_newstring(J, v->u.shrstr);
case JS_TUNDEFINED: js_typeerror(J, "cannot convert undefined to object");
case JS_TNULL: js_typeerror(J, "cannot convert null to object");
case JS_TBOOLEAN: return jsV_newboolean(J, v->u.boolean);
case JS_TNUMBER: return jsV_newnumber(J, v->u.number);
case JS_TLITSTR: return jsV_newstring(J, v->u.litstr);
case JS_TMEMSTR: return jsV_newstring(J, v->u.memstr->p);
case JS_TOBJECT: return v->u.object;
}
}
void js_newobjectx(js_State *J)
{
js_Object *prototype = NULL;
if (js_isobject(J, -1))
prototype = js_toobject(J, -1);
js_pop(J, 1);
js_pushobject(J, jsV_newobject(J, JS_COBJECT, prototype));
}
void js_newobject(js_State *J)
{
js_pushobject(J, jsV_newobject(J, JS_COBJECT, J->Object_prototype));
}
void js_newarguments(js_State *J)
{
js_pushobject(J, jsV_newobject(J, JS_CARGUMENTS, J->Object_prototype));
}
void js_newarray(js_State *J)
{
js_pushobject(J, jsV_newobject(J, JS_CARRAY, J->Array_prototype));
}
void js_newboolean(js_State *J, int v)
{
js_pushobject(J, jsV_newboolean(J, v));
}
void js_newnumber(js_State *J, double v)
{
js_pushobject(J, jsV_newnumber(J, v));
}
void js_newstring(js_State *J, const char *v)
{
js_pushobject(J, jsV_newstring(J, v));
}
void js_newfunction(js_State *J, js_Function *fun, js_Environment *scope)
{
js_Object *obj = jsV_newobject(J, JS_CFUNCTION, J->Function_prototype);
obj->u.f.function = fun;
obj->u.f.scope = scope;
js_pushobject(J, obj);
{
js_pushnumber(J, fun->numparams);
js_defproperty(J, -2, "length", JS_READONLY | JS_DONTENUM | JS_DONTCONF);
js_newobject(J);
{
js_copy(J, -2);
js_defproperty(J, -2, "constructor", JS_DONTENUM);
}
js_defproperty(J, -2, "prototype", JS_DONTCONF);
}
}
void js_newscript(js_State *J, js_Function *fun, js_Environment *scope)
{
js_Object *obj = jsV_newobject(J, JS_CSCRIPT, NULL);
obj->u.f.function = fun;
obj->u.f.scope = scope;
js_pushobject(J, obj);
}
void js_newcfunction(js_State *J, js_CFunction cfun, const char *name, int length)
{
js_Object *obj = jsV_newobject(J, JS_CCFUNCTION, J->Function_prototype);
obj->u.c.name = name;
obj->u.c.function = cfun;
obj->u.c.constructor = NULL;
obj->u.c.length = length;
js_pushobject(J, obj);
{
js_pushnumber(J, length);
js_defproperty(J, -2, "length", JS_READONLY | JS_DONTENUM | JS_DONTCONF);
js_newobject(J);
{
js_copy(J, -2);
js_defproperty(J, -2, "constructor", JS_DONTENUM);
}
js_defproperty(J, -2, "prototype", JS_DONTCONF);
}
}
/* prototype -- constructor */
void js_newcconstructor(js_State *J, js_CFunction cfun, js_CFunction ccon, const char *name, int length)
{
js_Object *obj = jsV_newobject(J, JS_CCFUNCTION, J->Function_prototype);
obj->u.c.name = name;
obj->u.c.function = cfun;
obj->u.c.constructor = ccon;
obj->u.c.length = length;
js_pushobject(J, obj); /* proto obj */
{
js_pushnumber(J, length);
js_defproperty(J, -2, "length", JS_READONLY | JS_DONTENUM | JS_DONTCONF);
js_rot2(J); /* obj proto */
js_copy(J, -2); /* obj proto obj */
js_defproperty(J, -2, "constructor", JS_DONTENUM);
js_defproperty(J, -2, "prototype", JS_READONLY | JS_DONTENUM | JS_DONTCONF);
}
}
void js_newuserdatax(js_State *J, const char *tag, void *data, js_HasProperty has, js_Put put, js_Delete delete, js_Finalize finalize)
{
js_Object *prototype = NULL;
js_Object *obj;
if (js_isobject(J, -1))
prototype = js_toobject(J, -1);
js_pop(J, 1);
obj = jsV_newobject(J, JS_CUSERDATA, prototype);
obj->u.user.tag = tag;
obj->u.user.data = data;
obj->u.user.has = has;
obj->u.user.put = put;
obj->u.user.delete = delete;
obj->u.user.finalize = finalize;
js_pushobject(J, obj);
}
void js_newuserdata(js_State *J, const char *tag, void *data, js_Finalize finalize)
{
js_newuserdatax(J, tag, data, NULL, NULL, NULL, finalize);
}
/* Non-trivial operations on values. These are implemented using the stack. */
int js_instanceof(js_State *J)
{
js_Object *O, *V;
if (!js_iscallable(J, -1))
js_typeerror(J, "instanceof: invalid operand");
if (!js_isobject(J, -2))
return 0;
js_getproperty(J, -1, "prototype");
if (!js_isobject(J, -1))
js_typeerror(J, "instanceof: 'prototype' property is not an object");
O = js_toobject(J, -1);
js_pop(J, 1);
V = js_toobject(J, -2);
while (V) {
V = V->prototype;
if (O == V)
return 1;
}
return 0;
}
void js_concat(js_State *J)
{
js_toprimitive(J, -2, JS_HNONE);
js_toprimitive(J, -1, JS_HNONE);
if (js_isstring(J, -2) || js_isstring(J, -1)) {
const char *sa = js_tostring(J, -2);
const char *sb = js_tostring(J, -1);
/* TODO: create js_String directly */
char *sab = js_malloc(J, strlen(sa) + strlen(sb) + 1);
strcpy(sab, sa);
strcat(sab, sb);
if (js_try(J)) {
js_free(J, sab);
js_throw(J);
}
js_pop(J, 2);
js_pushstring(J, sab);
js_endtry(J);
js_free(J, sab);
} else {
double x = js_tonumber(J, -2);
double y = js_tonumber(J, -1);
js_pop(J, 2);
js_pushnumber(J, x + y);
}
}
int js_compare(js_State *J, int *okay)
{
js_toprimitive(J, -2, JS_HNUMBER);
js_toprimitive(J, -1, JS_HNUMBER);
*okay = 1;
if (js_isstring(J, -2) && js_isstring(J, -1)) {
return strcmp(js_tostring(J, -2), js_tostring(J, -1));
} else {
double x = js_tonumber(J, -2);
double y = js_tonumber(J, -1);
if (isnan(x) || isnan(y))
*okay = 0;
return x < y ? -1 : x > y ? 1 : 0;
}
}
int js_equal(js_State *J)
{
js_Value *x = js_tovalue(J, -2);
js_Value *y = js_tovalue(J, -1);
retry:
if (JSV_ISSTRING(x) && JSV_ISSTRING(y))
return !strcmp(JSV_TOSTRING(x), JSV_TOSTRING(y));
if (x->type == y->type) {
if (x->type == JS_TUNDEFINED) return 1;
if (x->type == JS_TNULL) return 1;
if (x->type == JS_TNUMBER) return x->u.number == y->u.number;
if (x->type == JS_TBOOLEAN) return x->u.boolean == y->u.boolean;
if (x->type == JS_TOBJECT) return x->u.object == y->u.object;
return 0;
}
if (x->type == JS_TNULL && y->type == JS_TUNDEFINED) return 1;
if (x->type == JS_TUNDEFINED && y->type == JS_TNULL) return 1;
if (x->type == JS_TNUMBER && JSV_ISSTRING(y))
return x->u.number == jsV_tonumber(J, y);
if (JSV_ISSTRING(x) && y->type == JS_TNUMBER)
return jsV_tonumber(J, x) == y->u.number;
if (x->type == JS_TBOOLEAN) {
x->type = JS_TNUMBER;
x->u.number = x->u.boolean;
goto retry;
}
if (y->type == JS_TBOOLEAN) {
y->type = JS_TNUMBER;
y->u.number = y->u.boolean;
goto retry;
}
if ((JSV_ISSTRING(x) || x->type == JS_TNUMBER) && y->type == JS_TOBJECT) {
jsV_toprimitive(J, y, JS_HNONE);
goto retry;
}
if (x->type == JS_TOBJECT && (JSV_ISSTRING(y) || y->type == JS_TNUMBER)) {
jsV_toprimitive(J, x, JS_HNONE);
goto retry;
}
return 0;
}
int js_strictequal(js_State *J)
{
js_Value *x = js_tovalue(J, -2);
js_Value *y = js_tovalue(J, -1);
if (JSV_ISSTRING(x) && JSV_ISSTRING(y))
return !strcmp(JSV_TOSTRING(x), JSV_TOSTRING(y));
if (x->type != y->type) return 0;
if (x->type == JS_TUNDEFINED) return 1;
if (x->type == JS_TNULL) return 1;
if (x->type == JS_TNUMBER) return x->u.number == y->u.number;
if (x->type == JS_TBOOLEAN) return x->u.boolean == y->u.boolean;
if (x->type == JS_TOBJECT) return x->u.object == y->u.object;
return 0;
}
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