shithub: libmujs

ref: f3ea55fc6440ca9bf08e472f2d5e1f14ee0f4273
dir: /jsbstring.c/

#include "js.h"
#include "jsobject.h"
#include "jsrun.h"
#include "jsstate.h"
#include "jsutf.h"

static int jsB_new_String(js_State *J, int n)
{
	js_pushobject(J, jsR_newstring(J, n > 0 ? js_tostring(J, 0) : ""));
	return 1;
}

static int jsB_String(js_State *J, int n)
{
	js_pushliteral(J, n > 0 ? js_tostring(J, 1) : "");
	return 1;
}

static int Sp_toString(js_State *J, int n)
{
	js_Object *self = js_toobject(J, 0);
	if (self->type != JS_CSTRING) jsR_error(J, "TypeError");
	js_pushliteral(J, self->u.string);
	return 1;
}

static int Sp_valueOf(js_State *J, int n)
{
	js_Object *self = js_toobject(J, 0);
	if (self->type != JS_CSTRING) jsR_error(J, "TypeError");
	js_pushliteral(J, self->u.string);
	return 1;
}

static inline const char *utfindex(const char *s, int i)
{
	Rune rune;
	int c, n = 0;
	for (n = 0; n < i; ++n) {
		c = *(unsigned char*)s;
		if (c < Runeself) {
			if (c == 0)
				return NULL;
			++s;
		} else
			s += chartorune(&rune, s);
	}
	return s;
}

static int Sp_charAt(js_State *J, int n)
{
	char buf[UTFmax + 1];
	const char *s = js_tostring(J, 0);
	int pos = js_tointeger(J, 1);
	s = utfindex(s, pos);
	if (s) {
		Rune rune;
		chartorune(&rune, s);
		buf[runetochar(buf, &rune)] = 0;
		js_pushstring(J, buf);
	} else {
		js_pushliteral(J, "");
	}
	return 1;
}

static int Sp_charCodeAt(js_State *J, int n)
{
	const char *s = js_tostring(J, 0);
	int pos = js_tointeger(J, 1);
	s = utfindex(s, pos);
	if (s) {
		Rune rune;
		chartorune(&rune, s);
		js_pushnumber(J, rune);
	} else {
		js_pushnumber(J, NAN);
	}
	return 1;
}

static int S_fromCharCode(js_State *J, int n)
{
	int i;
	Rune c;
	char *s = malloc(n * UTFmax + 1), *p = s;
	// TODO: guard malloc with try/catch
	for (i = 0; i < n; i++) {
		c = js_tointeger(J, i + 1); // TODO: ToUInt16()
		p += runetochar(p, &c);
	}
	*p = 0;
	js_pushstring(J, s);
	free(s);
	return 1;
}

void jsB_initstring(js_State *J)
{
	J->String_prototype->u.string = "";

	js_pushobject(J, jsR_newcconstructor(J, jsB_String, jsB_new_String));
	{
		jsB_propn(J, "length", 1);

		js_pushobject(J, J->String_prototype);
		{
			js_copy(J, -2);
			js_setproperty(J, -2, "constructor");
			jsB_propf(J, "toString", Sp_toString, 0);
			jsB_propf(J, "valueOf", Sp_valueOf, 0);
			jsB_propf(J, "charAt", Sp_charAt, 1);
			jsB_propf(J, "charCodeAt", Sp_charCodeAt, 1);
		}
		js_setproperty(J, -2, "prototype");

		jsB_propf(J, "fromCharCode", S_fromCharCode, 1);
	}
	js_setglobal(J, "String");
}