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js: Add a simple loadJSON(path) built-in to load JSON from a file

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This is very handy when you want to load data from /proc, for example.
This commit is contained in:
Andreas Kling 2021-09-16 21:48:07 +02:00
parent d0506730b8
commit 63a0ebcc90
Notes: sideshowbarker 2024-07-18 03:50:33 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/63a0ebcc905
2 changed files with 36 additions and 1 deletions
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3
Userland/Libraries/LibJS/Runtime/JSONObject.h
View File

@ -22,6 +22,8 @@ public:
// test-js to communicate between the JS tests and the C++ test runner.
static String stringify_impl(GlobalObject&, Value value, Value replacer, Value space);
static Value parse_json_value(GlobalObject&, const JsonValue&);
private:
struct StringifyState {
FunctionObject* replacer_function { nullptr };
@ -40,7 +42,6 @@ private:
// Parse helpers
static Object* parse_json_object(GlobalObject&, const JsonObject&);
static Array* parse_json_array(GlobalObject&, const JsonArray&);
static Value parse_json_value(GlobalObject&, const JsonValue&);
static Value internalize_json_property(GlobalObject&, Object* holder, PropertyName const& name, FunctionObject& reviver);
JS_DECLARE_NATIVE_FUNCTION(stringify);

34
Userland/Utilities/js.cpp
View File

@ -33,6 +33,7 @@
#include <LibJS/Runtime/Intl/ListFormat.h>
#include <LibJS/Runtime/Intl/Locale.h>
#include <LibJS/Runtime/Intl/NumberFormat.h>
#include <LibJS/Runtime/JSONObject.h>
#include <LibJS/Runtime/Map.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/NumberObject.h>
@ -79,6 +80,7 @@ private:
JS_DECLARE_NATIVE_FUNCTION(repl_help);
JS_DECLARE_NATIVE_FUNCTION(load_file);
JS_DECLARE_NATIVE_FUNCTION(save_to_file);
JS_DECLARE_NATIVE_FUNCTION(load_json);
};
class ScriptObject final : public JS::GlobalObject {
@ -91,6 +93,7 @@ public:
private:
JS_DECLARE_NATIVE_FUNCTION(load_file);
JS_DECLARE_NATIVE_FUNCTION(load_json);
};
static bool s_dump_ast = false;
@ -909,6 +912,25 @@ static JS::Value load_file_impl(JS::VM& vm, JS::GlobalObject& global_object)
return JS::js_undefined();
}
static JS::Value load_json_impl(JS::VM& vm, JS::GlobalObject& global_object)
{
auto filename = vm.argument(0).to_string(global_object);
if (vm.exception())
return {};
auto file = Core::File::construct(filename);
if (!file->open(Core::OpenMode::ReadOnly)) {
vm.throw_exception<JS::Error>(global_object, String::formatted("Failed to open '{}': {}", filename, file->error_string()));
return {};
}
auto file_contents = file->read_all();
auto json = JsonValue::from_string(file_contents);
if (!json.has_value()) {
vm.throw_exception<JS::SyntaxError>(global_object, JS::ErrorType::JsonMalformed);
return {};
}
return JS::JSONObject::parse_json_value(global_object, json.value());
}
void ReplObject::initialize_global_object()
{
Base::initialize_global_object();
@ -918,6 +940,7 @@ void ReplObject::initialize_global_object()
define_native_function("help", repl_help, 0, attr);
define_native_function("load", load_file, 1, attr);
define_native_function("save", save_to_file, 1, attr);
define_native_function("loadJSON", load_json, 1, attr);
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::save_to_file)
@ -957,12 +980,18 @@ JS_DEFINE_NATIVE_FUNCTION(ReplObject::load_file)
return load_file_impl(vm, global_object);
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::load_json)
{
return load_json_impl(vm, global_object);
}
void ScriptObject::initialize_global_object()
{
Base::initialize_global_object();
define_direct_property("global", this, JS::Attribute::Enumerable);
u8 attr = JS::Attribute::Configurable | JS::Attribute::Writable | JS::Attribute::Enumerable;
define_native_function("load", load_file, 1, attr);
define_native_function("loadJSON", load_json, 1, attr);
}
JS_DEFINE_NATIVE_FUNCTION(ScriptObject::load_file)
@ -970,6 +999,11 @@ JS_DEFINE_NATIVE_FUNCTION(ScriptObject::load_file)
return load_file_impl(vm, global_object);
}
JS_DEFINE_NATIVE_FUNCTION(ScriptObject::load_json)
{
return load_json_impl(vm, global_object);
}
static void repl(JS::Interpreter& interpreter)
{
while (!s_fail_repl) {