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/*************************************************************************/
/* javascript_eval.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifdef JAVASCRIPT_EVAL_ENABLED
#include "api/javascript_eval.h"
#include "emscripten.h"
extern "C" EMSCRIPTEN_KEEPALIVE uint8_t *resize_poolbytearray_and_open_write(PoolByteArray *p_arr, PoolByteArray::Write *r_write, int p_len) {
p_arr->resize(p_len);
*r_write = p_arr->write();
return r_write->ptr();
}
Variant JavaScript::eval(const String &p_code, bool p_use_global_exec_context) {
union {
bool b;
double d;
char *s;
} js_data;
PoolByteArray arr;
PoolByteArray::Write arr_write;
/* clang-format off */
Variant::Type return_type = static_cast<Variant::Type>(EM_ASM_INT({
const CODE = $0;
const USE_GLOBAL_EXEC_CONTEXT = $1;
const PTR = $2;
const BYTEARRAY_PTR = $3;
const BYTEARRAY_WRITE_PTR = $4;
var eval_ret;
try {
if (USE_GLOBAL_EXEC_CONTEXT) {
// indirect eval call grants global execution context
var global_eval = eval;
eval_ret = global_eval(UTF8ToString(CODE));
} else {
eval_ret = eval(UTF8ToString(CODE));
}
} catch (e) {
err(e);
eval_ret = null;
}
switch (typeof eval_ret) {
case 'boolean':
setValue(PTR, eval_ret, 'i32');
return 1; // BOOL
case 'number':
setValue(PTR, eval_ret, 'double');
return 3; // REAL
case 'string':
var array_len = lengthBytesUTF8(eval_ret)+1;
var array_ptr = _malloc(array_len);
try {
if (array_ptr===0) {
throw new Error('String allocation failed (probably out of memory)');
}
setValue(PTR, array_ptr , '*');
stringToUTF8(eval_ret, array_ptr, array_len);
return 4; // STRING
} catch (e) {
if (array_ptr!==0) {
_free(array_ptr)
}
err(e);
// fall through
}
break;
case 'object':
if (eval_ret === null) {
break;
}
if (ArrayBuffer.isView(eval_ret) && !(eval_ret instanceof Uint8Array)) {
eval_ret = new Uint8Array(eval_ret.buffer);
}
else if (eval_ret instanceof ArrayBuffer) {
eval_ret = new Uint8Array(eval_ret);
}
if (eval_ret instanceof Uint8Array) {
var bytes_ptr = ccall('resize_poolbytearray_and_open_write', 'number', ['number', 'number' ,'number'], [BYTEARRAY_PTR, BYTEARRAY_WRITE_PTR, eval_ret.length]);
HEAPU8.set(eval_ret, bytes_ptr);
return 20; // POOL_BYTE_ARRAY
}
break;
}
return 0; // NIL
}, p_code.utf8().get_data(), p_use_global_exec_context, &js_data, &arr, &arr_write));
/* clang-format on */
switch (return_type) {
case Variant::BOOL:
return js_data.b;
case Variant::REAL:
return js_data.d;
case Variant::STRING: {
String str = String::utf8(js_data.s);
/* clang-format off */
EM_ASM_({ _free($0); }, js_data.s);
/* clang-format on */
return str;
}
case Variant::POOL_BYTE_ARRAY:
arr_write = PoolByteArray::Write();
return arr;
default:
return Variant();
}
}
#endif // JAVASCRIPT_EVAL_ENABLED
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