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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2008 litl, LLC
// SPDX-FileCopyrightText: 2009 Red Hat, Inc.
#include <config.h>
#include <string>
#include <glib.h>
#include <js/CallArgs.h>
#include <js/CharacterEncoding.h> // for JS_EncodeStringToUTF8
#include <js/Conversions.h>
#include <js/Exception.h>
#include <js/PropertySpec.h> // for JS_FN, JSFunctionSpec, JS_FS_END
#include <js/RootingAPI.h>
#include <js/TypeDecls.h>
#include <js/Utility.h> // for UniqueChars
#include <js/Value.h>
#include <jsapi.h>
#include "gjs/global.h"
#include "gjs/jsapi-util.h"
#include "modules/print.h"
GJS_JSAPI_RETURN_CONVENTION
static bool gjs_log(JSContext* cx, unsigned argc, JS::Value* vp) {
JS::CallArgs argv = JS::CallArgsFromVp(argc, vp);
if (argc != 1) {
gjs_throw(cx, "Must pass a single argument to log()");
return false;
}
/* JS::ToString might throw, in which case we will only log that the value
* could not be converted to string */
JS::AutoSaveExceptionState exc_state(cx);
JS::RootedString jstr(cx, JS::ToString(cx, argv[0]));
exc_state.restore();
if (!jstr) {
g_message("JS LOG: <cannot convert value to string>");
return true;
}
JS::UniqueChars s(JS_EncodeStringToUTF8(cx, jstr));
if (!s)
return false;
g_message("JS LOG: %s", s.get());
argv.rval().setUndefined();
return true;
}
GJS_JSAPI_RETURN_CONVENTION
static bool gjs_log_error(JSContext* cx, unsigned argc, JS::Value* vp) {
JS::CallArgs argv = JS::CallArgsFromVp(argc, vp);
if ((argc != 1 && argc != 2) || !argv[0].isObject()) {
gjs_throw(
cx,
"Must pass an exception and optionally a message to logError()");
return false;
}
JS::RootedString jstr(cx);
if (argc == 2) {
/* JS::ToString might throw, in which case we will only log that the
* value could not be converted to string */
JS::AutoSaveExceptionState exc_state(cx);
jstr = JS::ToString(cx, argv[1]);
exc_state.restore();
}
gjs_log_exception_full(cx, argv[0], jstr, G_LOG_LEVEL_WARNING);
argv.rval().setUndefined();
return true;
}
GJS_JSAPI_RETURN_CONVENTION
static bool gjs_print_parse_args(JSContext* cx, const JS::CallArgs& argv,
std::string* buffer) {
g_assert(buffer && "forgot out parameter");
buffer->clear();
for (unsigned n = 0; n < argv.length(); ++n) {
/* JS::ToString might throw, in which case we will only log that the
* value could not be converted to string */
JS::AutoSaveExceptionState exc_state(cx);
JS::RootedString jstr(cx, JS::ToString(cx, argv[n]));
exc_state.restore();
if (jstr) {
JS::UniqueChars s(JS_EncodeStringToUTF8(cx, jstr));
if (!s)
return false;
*buffer += s.get();
if (n < (argv.length() - 1))
*buffer += ' ';
} else {
*buffer = "<invalid string>";
return true;
}
}
return true;
}
GJS_JSAPI_RETURN_CONVENTION
static bool gjs_print(JSContext* context, unsigned argc, JS::Value* vp) {
JS::CallArgs argv = JS::CallArgsFromVp(argc, vp);
std::string buffer;
if (!gjs_print_parse_args(context, argv, &buffer))
return false;
g_print("%s\n", buffer.c_str());
argv.rval().setUndefined();
return true;
}
GJS_JSAPI_RETURN_CONVENTION
static bool gjs_printerr(JSContext* context, unsigned argc, JS::Value* vp) {
JS::CallArgs argv = JS::CallArgsFromVp(argc, vp);
std::string buffer;
if (!gjs_print_parse_args(context, argv, &buffer))
return false;
g_printerr("%s\n", buffer.c_str());
argv.rval().setUndefined();
return true;
}
// The pretty-print functionality is best written in JS, but needs to be used
// from C++ code. This stores the prettyPrint() function in a slot on the global
// object so that it can be used internally by the Console module.
// This function is not available to user code.
GJS_JSAPI_RETURN_CONVENTION
static bool set_pretty_print_function(JSContext*, unsigned argc,
JS::Value* vp) {
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
// can only be called internally, so OK to assert correct arguments
g_assert(args.length() == 2 && "setPrettyPrintFunction takes 2 arguments");
JS::Value v_global = args[0];
JS::Value v_func = args[1];
g_assert(v_global.isObject() && "first argument must be an object");
g_assert(v_func.isObject() && "second argument must be an object");
gjs_set_global_slot(&v_global.toObject(), GjsGlobalSlot::PRETTY_PRINT_FUNC,
v_func);
args.rval().setUndefined();
return true;
}
// clang-format off
static constexpr JSFunctionSpec funcs[] = {
JS_FN("log", gjs_log, 1, GJS_MODULE_PROP_FLAGS),
JS_FN("logError", gjs_log_error, 2, GJS_MODULE_PROP_FLAGS),
JS_FN("print", gjs_print, 0, GJS_MODULE_PROP_FLAGS),
JS_FN("printerr", gjs_printerr, 0, GJS_MODULE_PROP_FLAGS),
JS_FN("setPrettyPrintFunction", set_pretty_print_function, 1, GJS_MODULE_PROP_FLAGS),
JS_FS_END};
// clang-format on
bool gjs_define_print_stuff(JSContext* context,
JS::MutableHandleObject module) {
module.set(JS_NewPlainObject(context));
if (!module)
return false;
return JS_DefineFunctions(context, module, funcs);
}
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