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ladybird/Userland/Utilities/js.cpp
Linus Groh 9d0d3affd4 LibJS: Replace the custom unwind mechanism with completions :^) 
This includes:

- Parsing proper LabelledStatements with try_parse_labelled_statement()
- Removing LabelableStatement
- Implementing the LoopEvaluation semantics via loop_evaluation() in
  each IterationStatement subclass; and IterationStatement evaluation
  via {For,ForIn,ForOf,ForAwaitOf,While,DoWhile}Statement::execute()
- Updating ReturnStatement, BreakStatement and ContinueStatement to
  return the appropriate completion types
- Basically reimplementing TryStatement and SwitchStatement according to
  the spec, using completions
- Honoring result completion types in AsyncBlockStart and
  OrdinaryCallEvaluateBody
- Removing any uses of the VM unwind mechanism - most importantly,
  VM::throw_exception() now exclusively sets an exception and no longer
  triggers any unwinding mechanism.
  However, we already did a good job updating all of LibWeb and userland
  applications to not use it, and the few remaining uses elsewhere don't
  rely on unwinding AFAICT.
2022-01-06 12:36:23 +01:00

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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <AK/Format.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/StringBuilder.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/StandardPaths.h>
#include <LibCore/System.h>
#include <LibJS/AST.h>
#include <LibJS/Bytecode/BasicBlock.h>
#include <LibJS/Bytecode/Generator.h>
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Bytecode/PassManager.h>
#include <LibJS/Console.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Parser.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/BooleanObject.h>
#include <LibJS/Runtime/DataView.h>
#include <LibJS/Runtime/Date.h>
#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/FunctionObject.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Intl/DateTimeFormat.h>
#include <LibJS/Runtime/Intl/DisplayNames.h>
#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>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Promise.h>
#include <LibJS/Runtime/ProxyObject.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Set.h>
#include <LibJS/Runtime/ShadowRealm.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/StringObject.h>
#include <LibJS/Runtime/Temporal/Calendar.h>
#include <LibJS/Runtime/Temporal/Duration.h>
#include <LibJS/Runtime/Temporal/Instant.h>
#include <LibJS/Runtime/Temporal/PlainDate.h>
#include <LibJS/Runtime/Temporal/PlainDateTime.h>
#include <LibJS/Runtime/Temporal/PlainMonthDay.h>
#include <LibJS/Runtime/Temporal/PlainTime.h>
#include <LibJS/Runtime/Temporal/PlainYearMonth.h>
#include <LibJS/Runtime/Temporal/TimeZone.h>
#include <LibJS/Runtime/Temporal/ZonedDateTime.h>
#include <LibJS/Runtime/TypedArray.h>
#include <LibJS/Runtime/Value.h>
#include <LibLine/Editor.h>
#include <LibMain/Main.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
RefPtr<JS::VM> vm;
Vector<String> repl_statements;
class ReplObject final : public JS::GlobalObject {
JS_OBJECT(ReplObject, JS::GlobalObject);
public:
ReplObject() = default;
virtual void initialize_global_object() override;
virtual ~ReplObject() override = default;
private:
JS_DECLARE_NATIVE_FUNCTION(exit_interpreter);
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 {
JS_OBJECT(ScriptObject, JS::GlobalObject);
public:
ScriptObject() = default;
virtual void initialize_global_object() override;
virtual ~ScriptObject() override = default;
private:
JS_DECLARE_NATIVE_FUNCTION(load_file);
JS_DECLARE_NATIVE_FUNCTION(load_json);
};
static bool s_dump_ast = false;
static bool s_run_bytecode = false;
static bool s_opt_bytecode = false;
static bool s_as_module = false;
static bool s_print_last_result = false;
static bool s_strip_ansi = false;
static bool s_disable_source_location_hints = false;
static RefPtr<Line::Editor> s_editor;
static String s_history_path = String::formatted("{}/.js-history", Core::StandardPaths::home_directory());
static int s_repl_line_level = 0;
static bool s_fail_repl = false;
static String prompt_for_level(int level)
{
static StringBuilder prompt_builder;
prompt_builder.clear();
prompt_builder.append("> ");
for (auto i = 0; i < level; ++i)
prompt_builder.append(" ");
return prompt_builder.build();
}
static String read_next_piece()
{
StringBuilder piece;
auto line_level_delta_for_next_line { 0 };
do {
auto line_result = s_editor->get_line(prompt_for_level(s_repl_line_level));
line_level_delta_for_next_line = 0;
if (line_result.is_error()) {
s_fail_repl = true;
return "";
}
auto& line = line_result.value();
s_editor->add_to_history(line);
piece.append(line);
piece.append('\n');
auto lexer = JS::Lexer(line);
enum {
NotInLabelOrObjectKey,
InLabelOrObjectKeyIdentifier,
InLabelOrObjectKey
} label_state { NotInLabelOrObjectKey };
for (JS::Token token = lexer.next(); token.type() != JS::TokenType::Eof; token = lexer.next()) {
switch (token.type()) {
case JS::TokenType::BracketOpen:
case JS::TokenType::CurlyOpen:
case JS::TokenType::ParenOpen:
label_state = NotInLabelOrObjectKey;
s_repl_line_level++;
break;
case JS::TokenType::BracketClose:
case JS::TokenType::CurlyClose:
case JS::TokenType::ParenClose:
label_state = NotInLabelOrObjectKey;
s_repl_line_level--;
break;
case JS::TokenType::Identifier:
case JS::TokenType::StringLiteral:
if (label_state == NotInLabelOrObjectKey)
label_state = InLabelOrObjectKeyIdentifier;
else
label_state = NotInLabelOrObjectKey;
break;
case JS::TokenType::Colon:
if (label_state == InLabelOrObjectKeyIdentifier)
label_state = InLabelOrObjectKey;
else
label_state = NotInLabelOrObjectKey;
break;
default:
break;
}
}
if (label_state == InLabelOrObjectKey) {
// If there's a label or object literal key at the end of this line,
// prompt for more lines but do not change the line level.
line_level_delta_for_next_line += 1;
}
} while (s_repl_line_level + line_level_delta_for_next_line > 0);
return piece.to_string();
}
static String strip_ansi(StringView format_string)
{
if (format_string.is_empty())
return String::empty();
StringBuilder builder;
size_t i;
for (i = 0; i < format_string.length() - 1; ++i) {
if (format_string[i] == '\033' && format_string[i + 1] == '[') {
while (i < format_string.length() && format_string[i] != 'm')
++i;
} else {
builder.append(format_string[i]);
}
}
if (i < format_string.length())
builder.append(format_string[i]);
return builder.to_string();
}
template<typename... Parameters>
static void js_out(CheckedFormatString<Parameters...>&& fmtstr, const Parameters&... parameters)
{
if (!s_strip_ansi)
return out(move(fmtstr), parameters...);
auto stripped_fmtstr = strip_ansi(fmtstr.view());
out(stripped_fmtstr, parameters...);
}
template<typename... Parameters>
static void js_outln(CheckedFormatString<Parameters...>&& fmtstr, const Parameters&... parameters)
{
if (!s_strip_ansi)
return outln(move(fmtstr), parameters...);
auto stripped_fmtstr = strip_ansi(fmtstr.view());
outln(stripped_fmtstr, parameters...);
}
inline void js_outln() { outln(); }
static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects);
static void print_type(FlyString const& name)
{
js_out("[\033[36;1m{}\033[0m]", name);
}
static void print_separator(bool& first)
{
js_out(first ? " " : ", ");
first = false;
}
static void print_array(JS::Array& array, HashTable<JS::Object*>& seen_objects)
{
js_out("[");
bool first = true;
for (auto it = array.indexed_properties().begin(false); it != array.indexed_properties().end(); ++it) {
print_separator(first);
auto value_or_error = array.get(it.index());
// The V8 repl doesn't throw an exception here, and instead just
// prints 'undefined'. We may choose to replicate that behavior in
// the future, but for now lets just catch the error
if (value_or_error.is_error())
return;
auto value = value_or_error.release_value();
print_value(value, seen_objects);
}
if (!first)
js_out(" ");
js_out("]");
}
static void print_object(JS::Object& object, HashTable<JS::Object*>& seen_objects)
{
js_out("{{");
bool first = true;
for (auto& entry : object.indexed_properties()) {
print_separator(first);
js_out("\"\033[33;1m{}\033[0m\": ", entry.index());
auto value_or_error = object.get(entry.index());
// The V8 repl doesn't throw an exception here, and instead just
// prints 'undefined'. We may choose to replicate that behavior in
// the future, but for now lets just catch the error
if (value_or_error.is_error())
return;
auto value = value_or_error.release_value();
print_value(value, seen_objects);
}
for (auto& it : object.shape().property_table_ordered()) {
print_separator(first);
if (it.key.is_string()) {
js_out("\"\033[33;1m{}\033[0m\": ", it.key.to_display_string());
} else {
js_out("[\033[33;1m{}\033[0m]: ", it.key.to_display_string());
}
print_value(object.get_direct(it.value.offset), seen_objects);
}
if (!first)
js_out(" ");
js_out("}}");
}
static void print_function(JS::Object const& object, HashTable<JS::Object*>&)
{
print_type(object.class_name());
if (is<JS::ECMAScriptFunctionObject>(object))
js_out(" {}", static_cast<JS::ECMAScriptFunctionObject const&>(object).name());
else if (is<JS::NativeFunction>(object))
js_out(" {}", static_cast<JS::NativeFunction const&>(object).name());
}
static void print_date(JS::Object const& object, HashTable<JS::Object*>&)
{
print_type("Date");
js_out(" \033[34;1m{}\033[0m", static_cast<JS::Date const&>(object).string());
}
static void print_error(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto name = object.get_without_side_effects(vm->names.name).value_or(JS::js_undefined());
auto message = object.get_without_side_effects(vm->names.message).value_or(JS::js_undefined());
if (name.is_accessor() || message.is_accessor()) {
print_value(&object, seen_objects);
} else {
auto name_string = name.to_string_without_side_effects();
auto message_string = message.to_string_without_side_effects();
print_type(name_string);
if (!message_string.is_empty())
js_out(" \033[31;1m{}\033[0m", message_string);
}
}
static void print_regexp_object(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& regexp_object = static_cast<JS::RegExpObject const&>(object);
print_type("RegExp");
js_out(" \033[34;1m/{}/{}\033[0m", regexp_object.escape_regexp_pattern(), regexp_object.flags());
}
static void print_proxy_object(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& proxy_object = static_cast<JS::ProxyObject const&>(object);
print_type("Proxy");
js_out("\n target: ");
print_value(&proxy_object.target(), seen_objects);
js_out("\n handler: ");
print_value(&proxy_object.handler(), seen_objects);
}
static void print_map(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& map = static_cast<JS::Map const&>(object);
auto& entries = map.entries();
print_type("Map");
js_out(" {{");
bool first = true;
for (auto& entry : entries) {
print_separator(first);
print_value(entry.key, seen_objects);
js_out(" => ");
print_value(entry.value, seen_objects);
}
if (!first)
js_out(" ");
js_out("}}");
}
static void print_set(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& set = static_cast<JS::Set const&>(object);
auto& values = set.values();
print_type("Set");
js_out(" {{");
bool first = true;
for (auto& value : values) {
print_separator(first);
print_value(value, seen_objects);
}
if (!first)
js_out(" ");
js_out("}}");
}
static void print_promise(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& promise = static_cast<JS::Promise const&>(object);
print_type("Promise");
switch (promise.state()) {
case JS::Promise::State::Pending:
js_out("\n state: ");
js_out("\033[36;1mPending\033[0m");
break;
case JS::Promise::State::Fulfilled:
js_out("\n state: ");
js_out("\033[32;1mFulfilled\033[0m");
js_out("\n result: ");
print_value(promise.result(), seen_objects);
break;
case JS::Promise::State::Rejected:
js_out("\n state: ");
js_out("\033[31;1mRejected\033[0m");
js_out("\n result: ");
print_value(promise.result(), seen_objects);
break;
default:
VERIFY_NOT_REACHED();
}
}
static void print_array_buffer(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& array_buffer = static_cast<JS::ArrayBuffer const&>(object);
auto& buffer = array_buffer.buffer();
auto byte_length = array_buffer.byte_length();
print_type("ArrayBuffer");
js_out("\n byteLength: ");
print_value(JS::Value((double)byte_length), seen_objects);
if (!byte_length)
return;
js_outln();
for (size_t i = 0; i < byte_length; ++i) {
js_out("{:02x}", buffer[i]);
if (i + 1 < byte_length) {
if ((i + 1) % 32 == 0)
js_outln();
else if ((i + 1) % 16 == 0)
js_out(" ");
else
js_out(" ");
}
}
}
static void print_shadow_realm(JS::Object const&, HashTable<JS::Object*>&)
{
// Not much we can show here that would be useful. Realm pointer address?!
print_type("ShadowRealm");
}
template<typename T>
static void print_number(T number) requires IsArithmetic<T>
{
js_out("\033[35;1m");
js_out("{}", number);
js_out("\033[0m");
}
static void print_typed_array(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& typed_array_base = static_cast<JS::TypedArrayBase const&>(object);
auto& array_buffer = *typed_array_base.viewed_array_buffer();
auto length = typed_array_base.array_length();
print_type(object.class_name());
js_out("\n length: ");
print_value(JS::Value(length), seen_objects);
js_out("\n byteLength: ");
print_value(JS::Value(typed_array_base.byte_length()), seen_objects);
js_out("\n buffer: ");
print_type("ArrayBuffer");
if (array_buffer.is_detached())
js_out(" (detached)");
js_out(" @ {:p}", &array_buffer);
if (!length || array_buffer.is_detached())
return;
js_outln();
// FIXME: This kinda sucks.
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
if (is<JS::ClassName>(object)) { \
js_out("[ "); \
auto& typed_array = static_cast<JS::ClassName const&>(typed_array_base); \
auto data = typed_array.data(); \
for (size_t i = 0; i < length; ++i) { \
if (i > 0) \
js_out(", "); \
print_number(data[i]); \
} \
js_out(" ]"); \
return; \
}
JS_ENUMERATE_TYPED_ARRAYS
#undef __JS_ENUMERATE
VERIFY_NOT_REACHED();
}
static void print_data_view(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& data_view = static_cast<JS::DataView const&>(object);
print_type("DataView");
js_out("\n byteLength: ");
print_value(JS::Value(data_view.byte_length()), seen_objects);
js_out("\n byteOffset: ");
print_value(JS::Value(data_view.byte_offset()), seen_objects);
js_out("\n buffer: ");
print_type("ArrayBuffer");
js_out(" @ {:p}", data_view.viewed_array_buffer());
}
static void print_temporal_calendar(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& calendar = static_cast<JS::Temporal::Calendar const&>(object);
print_type("Temporal.Calendar");
js_out(" ");
print_value(JS::js_string(object.vm(), calendar.identifier()), seen_objects);
}
static void print_temporal_duration(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& duration = static_cast<JS::Temporal::Duration const&>(object);
print_type("Temporal.Duration");
js_out(" \033[34;1m{} y, {} M, {} w, {} d, {} h, {} m, {} s, {} ms, {} us, {} ns\033[0m", duration.years(), duration.months(), duration.weeks(), duration.days(), duration.hours(), duration.minutes(), duration.seconds(), duration.milliseconds(), duration.microseconds(), duration.nanoseconds());
}
static void print_temporal_instant(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& instant = static_cast<JS::Temporal::Instant const&>(object);
print_type("Temporal.Instant");
js_out(" ");
// FIXME: Print human readable date and time, like in print_date() - ideally handling arbitrarily large values since we get a bigint.
print_value(&instant.nanoseconds(), seen_objects);
}
static void print_temporal_plain_date(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& plain_date = static_cast<JS::Temporal::PlainDate const&>(object);
print_type("Temporal.PlainDate");
js_out(" \033[34;1m{:04}-{:02}-{:02}\033[0m", plain_date.iso_year(), plain_date.iso_month(), plain_date.iso_day());
js_out("\n calendar: ");
print_value(&plain_date.calendar(), seen_objects);
}
static void print_temporal_plain_date_time(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& plain_date_time = static_cast<JS::Temporal::PlainDateTime const&>(object);
print_type("Temporal.PlainDateTime");
js_out(" \033[34;1m{:04}-{:02}-{:02} {:02}:{:02}:{:02}.{:03}{:03}{:03}\033[0m", plain_date_time.iso_year(), plain_date_time.iso_month(), plain_date_time.iso_day(), plain_date_time.iso_hour(), plain_date_time.iso_minute(), plain_date_time.iso_second(), plain_date_time.iso_millisecond(), plain_date_time.iso_microsecond(), plain_date_time.iso_nanosecond());
js_out("\n calendar: ");
print_value(&plain_date_time.calendar(), seen_objects);
}
static void print_temporal_plain_month_day(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& plain_month_day = static_cast<JS::Temporal::PlainMonthDay const&>(object);
print_type("Temporal.PlainMonthDay");
// Also has an [[ISOYear]] internal slot, but showing that here seems rather unexpected.
js_out(" \033[34;1m{:02}-{:02}\033[0m", plain_month_day.iso_month(), plain_month_day.iso_day());
js_out("\n calendar: ");
print_value(&plain_month_day.calendar(), seen_objects);
}
static void print_temporal_plain_time(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& plain_time = static_cast<JS::Temporal::PlainTime const&>(object);
print_type("Temporal.PlainTime");
js_out(" \033[34;1m{:02}:{:02}:{:02}.{:03}{:03}{:03}\033[0m", plain_time.iso_hour(), plain_time.iso_minute(), plain_time.iso_second(), plain_time.iso_millisecond(), plain_time.iso_microsecond(), plain_time.iso_nanosecond());
js_out("\n calendar: ");
print_value(&plain_time.calendar(), seen_objects);
}
static void print_temporal_plain_year_month(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& plain_year_month = static_cast<JS::Temporal::PlainYearMonth const&>(object);
print_type("Temporal.PlainYearMonth");
// Also has an [[ISODay]] internal slot, but showing that here seems rather unexpected.
js_out(" \033[34;1m{:04}-{:02}\033[0m", plain_year_month.iso_year(), plain_year_month.iso_month());
js_out("\n calendar: ");
print_value(&plain_year_month.calendar(), seen_objects);
}
static void print_temporal_time_zone(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& time_zone = static_cast<JS::Temporal::TimeZone const&>(object);
print_type("Temporal.TimeZone");
js_out(" ");
print_value(JS::js_string(object.vm(), time_zone.identifier()), seen_objects);
if (time_zone.offset_nanoseconds().has_value()) {
js_out("\n offset (ns): ");
print_value(JS::Value(*time_zone.offset_nanoseconds()), seen_objects);
}
}
static void print_temporal_zoned_date_time(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& zoned_date_time = static_cast<JS::Temporal::ZonedDateTime const&>(object);
print_type("Temporal.ZonedDateTime");
js_out("\n epochNanoseconds: ");
print_value(&zoned_date_time.nanoseconds(), seen_objects);
js_out("\n timeZone: ");
print_value(&zoned_date_time.time_zone(), seen_objects);
js_out("\n calendar: ");
print_value(&zoned_date_time.calendar(), seen_objects);
}
static void print_intl_display_names(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& display_names = static_cast<JS::Intl::DisplayNames const&>(object);
print_type("Intl.DisplayNames");
js_out("\n locale: ");
print_value(js_string(object.vm(), display_names.locale()), seen_objects);
js_out("\n type: ");
print_value(js_string(object.vm(), display_names.type_string()), seen_objects);
js_out("\n style: ");
print_value(js_string(object.vm(), display_names.style_string()), seen_objects);
js_out("\n fallback: ");
print_value(js_string(object.vm(), display_names.fallback_string()), seen_objects);
}
static void print_intl_locale(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& locale = static_cast<JS::Intl::Locale const&>(object);
print_type("Intl.Locale");
js_out("\n locale: ");
print_value(js_string(object.vm(), locale.locale()), seen_objects);
if (locale.has_calendar()) {
js_out("\n calendar: ");
print_value(js_string(object.vm(), locale.calendar()), seen_objects);
}
if (locale.has_case_first()) {
js_out("\n caseFirst: ");
print_value(js_string(object.vm(), locale.case_first()), seen_objects);
}
if (locale.has_collation()) {
js_out("\n collation: ");
print_value(js_string(object.vm(), locale.collation()), seen_objects);
}
if (locale.has_hour_cycle()) {
js_out("\n hourCycle: ");
print_value(js_string(object.vm(), locale.hour_cycle()), seen_objects);
}
if (locale.has_numbering_system()) {
js_out("\n numberingSystem: ");
print_value(js_string(object.vm(), locale.numbering_system()), seen_objects);
}
js_out("\n numeric: ");
print_value(JS::Value(locale.numeric()), seen_objects);
}
static void print_intl_list_format(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& list_format = static_cast<JS::Intl::ListFormat const&>(object);
print_type("Intl.ListFormat");
js_out("\n locale: ");
print_value(js_string(object.vm(), list_format.locale()), seen_objects);
js_out("\n type: ");
print_value(js_string(object.vm(), list_format.type_string()), seen_objects);
js_out("\n style: ");
print_value(js_string(object.vm(), list_format.style_string()), seen_objects);
}
static void print_intl_number_format(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& number_format = static_cast<JS::Intl::NumberFormat const&>(object);
print_type("Intl.NumberFormat");
js_out("\n locale: ");
print_value(js_string(object.vm(), number_format.locale()), seen_objects);
js_out("\n dataLocale: ");
print_value(js_string(object.vm(), number_format.data_locale()), seen_objects);
js_out("\n numberingSystem: ");
print_value(js_string(object.vm(), number_format.numbering_system()), seen_objects);
js_out("\n style: ");
print_value(js_string(object.vm(), number_format.style_string()), seen_objects);
if (number_format.has_currency()) {
js_out("\n currency: ");
print_value(js_string(object.vm(), number_format.currency()), seen_objects);
}
if (number_format.has_currency_display()) {
js_out("\n currencyDisplay: ");
print_value(js_string(object.vm(), number_format.currency_display_string()), seen_objects);
}
if (number_format.has_currency_sign()) {
js_out("\n currencySign: ");
print_value(js_string(object.vm(), number_format.currency_sign_string()), seen_objects);
}
if (number_format.has_unit()) {
js_out("\n unit: ");
print_value(js_string(object.vm(), number_format.unit()), seen_objects);
}
if (number_format.has_unit_display()) {
js_out("\n unitDisplay: ");
print_value(js_string(object.vm(), number_format.unit_display_string()), seen_objects);
}
js_out("\n minimumIntegerDigits: ");
print_value(JS::Value(number_format.min_integer_digits()), seen_objects);
if (number_format.has_min_fraction_digits()) {
js_out("\n minimumFractionDigits: ");
print_value(JS::Value(number_format.min_fraction_digits()), seen_objects);
}
if (number_format.has_max_fraction_digits()) {
js_out("\n maximumFractionDigits: ");
print_value(JS::Value(number_format.max_fraction_digits()), seen_objects);
}
if (number_format.has_min_significant_digits()) {
js_out("\n minimumSignificantDigits: ");
print_value(JS::Value(number_format.min_significant_digits()), seen_objects);
}
if (number_format.has_max_significant_digits()) {
js_out("\n maximumSignificantDigits: ");
print_value(JS::Value(number_format.max_significant_digits()), seen_objects);
}
js_out("\n useGrouping: ");
print_value(JS::Value(number_format.use_grouping()), seen_objects);
js_out("\n roundingType: ");
print_value(js_string(object.vm(), number_format.rounding_type_string()), seen_objects);
js_out("\n notation: ");
print_value(js_string(object.vm(), number_format.notation_string()), seen_objects);
if (number_format.has_compact_display()) {
js_out("\n compactDisplay: ");
print_value(js_string(object.vm(), number_format.compact_display_string()), seen_objects);
}
js_out("\n signDisplay: ");
print_value(js_string(object.vm(), number_format.sign_display_string()), seen_objects);
}
static void print_intl_date_time_format(JS::Object& object, HashTable<JS::Object*>& seen_objects)
{
auto& date_time_format = static_cast<JS::Intl::DateTimeFormat&>(object);
print_type("Intl.DateTimeFormat");
js_out("\n locale: ");
print_value(js_string(object.vm(), date_time_format.locale()), seen_objects);
js_out("\n pattern: ");
print_value(js_string(object.vm(), date_time_format.pattern()), seen_objects);
js_out("\n calendar: ");
print_value(js_string(object.vm(), date_time_format.calendar()), seen_objects);
js_out("\n numberingSystem: ");
print_value(js_string(object.vm(), date_time_format.numbering_system()), seen_objects);
if (date_time_format.has_hour_cycle()) {
js_out("\n hourCycle: ");
print_value(js_string(object.vm(), date_time_format.hour_cycle_string()), seen_objects);
}
js_out("\n timeZone: ");
print_value(js_string(object.vm(), date_time_format.time_zone()), seen_objects);
if (date_time_format.has_date_style()) {
js_out("\n dateStyle: ");
print_value(js_string(object.vm(), date_time_format.date_style_string()), seen_objects);
}
if (date_time_format.has_time_style()) {
js_out("\n timeStyle: ");
print_value(js_string(object.vm(), date_time_format.time_style_string()), seen_objects);
}
JS::Intl::for_each_calendar_field(date_time_format.global_object(), date_time_format, [&](auto& option, auto const& property, auto const&) -> JS::ThrowCompletionOr<void> {
using ValueType = typename RemoveReference<decltype(option)>::ValueType;
if (!option.has_value())
return {};
js_out("\n {}: ", property);
if constexpr (IsIntegral<ValueType>) {
print_value(JS::Value(*option), seen_objects);
} else {
auto name = Unicode::calendar_pattern_style_to_string(*option);
print_value(js_string(object.vm(), name), seen_objects);
}
return {};
});
}
static void print_primitive_wrapper_object(FlyString const& name, JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
// BooleanObject, NumberObject, StringObject
print_type(name);
js_out(" ");
print_value(&object, seen_objects);
}
static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects)
{
if (value.is_empty()) {
js_out("\033[34;1m<empty>\033[0m");
return;
}
if (value.is_object()) {
if (seen_objects.contains(&value.as_object())) {
// FIXME: Maybe we should only do this for circular references,
// not for all reoccurring objects.
js_out("<already printed Object {}>", &value.as_object());
return;
}
seen_objects.set(&value.as_object());
}
if (value.is_object()) {
auto& object = value.as_object();
if (is<JS::Array>(object))
return print_array(static_cast<JS::Array&>(object), seen_objects);
if (object.is_function())
return print_function(object, seen_objects);
if (is<JS::Date>(object))
return print_date(object, seen_objects);
if (is<JS::Error>(object))
return print_error(object, seen_objects);
auto prototype_or_error = object.internal_get_prototype_of();
if (prototype_or_error.has_value() && prototype_or_error.value() == object.global_object().error_prototype())
return print_error(object, seen_objects);
vm->clear_exception();
if (is<JS::RegExpObject>(object))
return print_regexp_object(object, seen_objects);
if (is<JS::Map>(object))
return print_map(object, seen_objects);
if (is<JS::Set>(object))
return print_set(object, seen_objects);
if (is<JS::DataView>(object))
return print_data_view(object, seen_objects);
if (is<JS::ProxyObject>(object))
return print_proxy_object(object, seen_objects);
if (is<JS::Promise>(object))
return print_promise(object, seen_objects);
if (is<JS::ArrayBuffer>(object))
return print_array_buffer(object, seen_objects);
if (is<JS::ShadowRealm>(object))
return print_shadow_realm(object, seen_objects);
if (object.is_typed_array())
return print_typed_array(object, seen_objects);
if (is<JS::StringObject>(object))
return print_primitive_wrapper_object("String", object, seen_objects);
if (is<JS::NumberObject>(object))
return print_primitive_wrapper_object("Number", object, seen_objects);
if (is<JS::BooleanObject>(object))
return print_primitive_wrapper_object("Boolean", object, seen_objects);
if (is<JS::Temporal::Calendar>(object))
return print_temporal_calendar(object, seen_objects);
if (is<JS::Temporal::Duration>(object))
return print_temporal_duration(object, seen_objects);
if (is<JS::Temporal::Instant>(object))
return print_temporal_instant(object, seen_objects);
if (is<JS::Temporal::PlainDate>(object))
return print_temporal_plain_date(object, seen_objects);
if (is<JS::Temporal::PlainDateTime>(object))
return print_temporal_plain_date_time(object, seen_objects);
if (is<JS::Temporal::PlainMonthDay>(object))
return print_temporal_plain_month_day(object, seen_objects);
if (is<JS::Temporal::PlainTime>(object))
return print_temporal_plain_time(object, seen_objects);
if (is<JS::Temporal::PlainYearMonth>(object))
return print_temporal_plain_year_month(object, seen_objects);
if (is<JS::Temporal::TimeZone>(object))
return print_temporal_time_zone(object, seen_objects);
if (is<JS::Temporal::ZonedDateTime>(object))
return print_temporal_zoned_date_time(object, seen_objects);
if (is<JS::Intl::DisplayNames>(object))
return print_intl_display_names(object, seen_objects);
if (is<JS::Intl::Locale>(object))
return print_intl_locale(object, seen_objects);
if (is<JS::Intl::ListFormat>(object))
return print_intl_list_format(object, seen_objects);
if (is<JS::Intl::NumberFormat>(object))
return print_intl_number_format(object, seen_objects);
if (is<JS::Intl::DateTimeFormat>(object))
return print_intl_date_time_format(object, seen_objects);
return print_object(object, seen_objects);
}
if (value.is_string())
js_out("\033[32;1m");
else if (value.is_number() || value.is_bigint())
js_out("\033[35;1m");
else if (value.is_boolean())
js_out("\033[33;1m");
else if (value.is_null())
js_out("\033[33;1m");
else if (value.is_undefined())
js_out("\033[34;1m");
if (value.is_string())
js_out("\"");
else if (value.is_negative_zero())
js_out("-");
js_out("{}", value.to_string_without_side_effects());
if (value.is_string())
js_out("\"");
js_out("\033[0m");
}
static void print(JS::Value value)
{
HashTable<JS::Object*> seen_objects;
print_value(value, seen_objects);
js_outln();
}
static bool write_to_file(String const& path)
{
int fd = open(path.characters(), O_WRONLY | O_CREAT | O_TRUNC, 0666);
for (size_t i = 0; i < repl_statements.size(); i++) {
auto line = repl_statements[i];
if (line.length() && i != repl_statements.size() - 1) {
ssize_t nwritten = write(fd, line.characters(), line.length());
if (nwritten < 0) {
close(fd);
return false;
}
}
if (i != repl_statements.size() - 1) {
char ch = '\n';
ssize_t nwritten = write(fd, &ch, 1);
if (nwritten != 1) {
perror("write");
close(fd);
return false;
}
}
}
close(fd);
return true;
}
static bool parse_and_run(JS::Interpreter& interpreter, StringView source, StringView source_name)
{
auto program_type = s_as_module ? JS::Program::Type::Module : JS::Program::Type::Script;
auto parser = JS::Parser(JS::Lexer(source), program_type);
auto program = parser.parse_program();
if (s_dump_ast)
program->dump(0);
if (parser.has_errors()) {
auto error = parser.errors()[0];
if (!s_disable_source_location_hints) {
auto hint = error.source_location_hint(source);
if (!hint.is_empty())
js_outln("{}", hint);
}
vm->throw_exception<JS::SyntaxError>(interpreter.global_object(), error.to_string());
} else {
if (JS::Bytecode::g_dump_bytecode || s_run_bytecode) {
auto executable = JS::Bytecode::Generator::generate(*program);
executable.name = source_name;
if (s_opt_bytecode) {
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline();
passes.perform(executable);
dbgln("Optimisation passes took {}us", passes.elapsed());
}
if (JS::Bytecode::g_dump_bytecode)
executable.dump();
if (s_run_bytecode) {
JS::Bytecode::Interpreter bytecode_interpreter(interpreter.global_object(), interpreter.realm());
auto result = bytecode_interpreter.run(executable);
// Since all the error handling code uses vm.exception() we just rethrow any exception we got here.
if (result.is_error())
vm->throw_exception(interpreter.global_object(), *result.throw_completion().value());
} else {
return true;
}
} else {
interpreter.run(interpreter.global_object(), *program);
}
}
auto handle_exception = [&] {
auto* exception = vm->exception();
vm->clear_exception();
js_out("Uncaught exception: ");
print(exception->value());
auto& traceback = exception->traceback();
if (traceback.size() > 1) {
unsigned repetitions = 0;
for (size_t i = 0; i < traceback.size(); ++i) {
auto& traceback_frame = traceback[i];
if (i + 1 < traceback.size()) {
auto& next_traceback_frame = traceback[i + 1];
if (next_traceback_frame.function_name == traceback_frame.function_name) {
repetitions++;
continue;
}
}
if (repetitions > 4) {
// If more than 5 (1 + >4) consecutive function calls with the same name, print
// the name only once and show the number of repetitions instead. This prevents
// printing ridiculously large call stacks of recursive functions.
js_outln(" -> {}", traceback_frame.function_name);
js_outln(" {} more calls", repetitions);
} else {
for (size_t j = 0; j < repetitions + 1; ++j)
js_outln(" -> {}", traceback_frame.function_name);
}
repetitions = 0;
}
}
};
if (vm->exception()) {
handle_exception();
return false;
}
if (s_print_last_result)
print(vm->last_value());
if (vm->exception()) {
handle_exception();
return false;
}
return true;
}
static JS::ThrowCompletionOr<JS::Value> load_file_impl(JS::VM& vm, JS::GlobalObject& global_object)
{
auto filename = TRY(vm.argument(0).to_string(global_object));
auto file = Core::File::construct(filename);
if (!file->open(Core::OpenMode::ReadOnly))
return vm.throw_completion<JS::Error>(global_object, String::formatted("Failed to open '{}': {}", filename, file->error_string()));
auto file_contents = file->read_all();
auto source = StringView { file_contents };
auto parser = JS::Parser(JS::Lexer(source));
auto program = parser.parse_program();
if (parser.has_errors()) {
auto& error = parser.errors()[0];
return vm.throw_completion<JS::SyntaxError>(global_object, error.to_string());
}
// FIXME: Use eval()-like semantics and execute in current scope?
vm.interpreter().run(global_object, *program);
return JS::js_undefined();
}
static JS::ThrowCompletionOr<JS::Value> load_json_impl(JS::VM& vm, JS::GlobalObject& global_object)
{
auto filename = TRY(vm.argument(0).to_string(global_object));
auto file = Core::File::construct(filename);
if (!file->open(Core::OpenMode::ReadOnly))
return vm.throw_completion<JS::Error>(global_object, String::formatted("Failed to open '{}': {}", filename, file->error_string()));
auto file_contents = file->read_all();
auto json = JsonValue::from_string(file_contents);
if (json.is_error())
return vm.throw_completion<JS::SyntaxError>(global_object, JS::ErrorType::JsonMalformed);
return JS::JSONObject::parse_json_value(global_object, json.value());
}
void ReplObject::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("exit", exit_interpreter, 0, attr);
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)
{
if (!vm.argument_count())
return JS::Value(false);
String save_path = vm.argument(0).to_string_without_side_effects();
StringView path = StringView(save_path.characters());
if (write_to_file(path)) {
return JS::Value(true);
}
return JS::Value(false);
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::exit_interpreter)
{
if (!vm.argument_count())
exit(0);
exit(TRY(vm.argument(0).to_number(global_object)).as_double());
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::repl_help)
{
js_outln("REPL commands:");
js_outln(" exit(code): exit the REPL with specified code. Defaults to 0.");
js_outln(" help(): display this menu");
js_outln(" load(file): load given JS file into running session. For example: load(\"foo.js\")");
js_outln(" save(file): write REPL input history to the given file. For example: save(\"foo.txt\")");
return JS::js_undefined();
}
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)
{
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) {
String piece = read_next_piece();
if (piece.is_empty())
continue;
repl_statements.append(piece);
parse_and_run(interpreter, piece, "REPL");
}
}
static Function<void()> interrupt_interpreter;
static void sigint_handler()
{
interrupt_interpreter();
}
class ReplConsoleClient final : public JS::ConsoleClient {
public:
ReplConsoleClient(JS::Console& console)
: ConsoleClient(console)
{
}
virtual void clear() override
{
js_out("\033[3J\033[H\033[2J");
m_group_stack_depth = 0;
fflush(stdout);
}
virtual void end_group() override
{
if (m_group_stack_depth > 0)
m_group_stack_depth--;
}
// 2.3. Printer(logLevel, args[, options]), https://console.spec.whatwg.org/#printer
virtual JS::ThrowCompletionOr<JS::Value> printer(JS::Console::LogLevel log_level, PrinterArguments arguments) override
{
String indent = String::repeated(" ", m_group_stack_depth);
if (log_level == JS::Console::LogLevel::Trace) {
auto trace = arguments.get<JS::Console::Trace>();
StringBuilder builder;
if (!trace.label.is_empty())
builder.appendff("{}\033[36;1m{}\033[0m\n", indent, trace.label);
for (auto& function_name : trace.stack)
builder.appendff("{}-> {}\n", indent, function_name);
js_outln("{}", builder.string_view());
return JS::js_undefined();
}
if (log_level == JS::Console::LogLevel::Group || log_level == JS::Console::LogLevel::GroupCollapsed) {
auto group = arguments.get<JS::Console::Group>();
js_outln("{}\033[36;1m{}\033[0m", indent, group.label);
m_group_stack_depth++;
return JS::js_undefined();
}
auto output = String::join(" ", arguments.get<Vector<JS::Value>>());
m_console.output_debug_message(log_level, output);
switch (log_level) {
case JS::Console::LogLevel::Debug:
js_outln("{}\033[36;1m{}\033[0m", indent, output);
break;
case JS::Console::LogLevel::Error:
case JS::Console::LogLevel::Assert:
js_outln("{}\033[31;1m{}\033[0m", indent, output);
break;
case JS::Console::LogLevel::Info:
js_outln("{}(i) {}", indent, output);
break;
case JS::Console::LogLevel::Log:
js_outln("{}{}", indent, output);
break;
case JS::Console::LogLevel::Warn:
case JS::Console::LogLevel::CountReset:
js_outln("{}\033[33;1m{}\033[0m", indent, output);
break;
default:
js_outln("{}{}", indent, output);
break;
}
return JS::js_undefined();
}
private:
int m_group_stack_depth { 0 };
};
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
#ifdef __serenity__
TRY(Core::System::pledge("stdio rpath wpath cpath tty sigaction"));
#endif
bool gc_on_every_allocation = false;
bool disable_syntax_highlight = false;
Vector<StringView> script_paths;
Core::ArgsParser args_parser;
args_parser.set_general_help("This is a JavaScript interpreter.");
args_parser.add_option(s_dump_ast, "Dump the AST", "dump-ast", 'A');
args_parser.add_option(JS::Bytecode::g_dump_bytecode, "Dump the bytecode", "dump-bytecode", 'd');
args_parser.add_option(s_run_bytecode, "Run the bytecode", "run-bytecode", 'b');
args_parser.add_option(s_opt_bytecode, "Optimize the bytecode", "optimize-bytecode", 'p');
args_parser.add_option(s_as_module, "Treat as module", "as-module", 'm');
args_parser.add_option(s_print_last_result, "Print last result", "print-last-result", 'l');
args_parser.add_option(s_strip_ansi, "Disable ANSI colors", "disable-ansi-colors", 'c');
args_parser.add_option(s_disable_source_location_hints, "Disable source location hints", "disable-source-location-hints", 'h');
args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
#ifdef JS_TRACK_ZOMBIE_CELLS
bool zombify_dead_cells = false;
args_parser.add_option(zombify_dead_cells, "Zombify dead cells (to catch missing GC marks)", "zombify-dead-cells", 'z');
#endif
args_parser.add_option(disable_syntax_highlight, "Disable live syntax highlighting", "no-syntax-highlight", 's');
args_parser.add_positional_argument(script_paths, "Path to script files", "scripts", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
bool syntax_highlight = !disable_syntax_highlight;
vm = JS::VM::create();
// NOTE: These will print out both warnings when using something like Promise.reject().catch(...) -
// which is, as far as I can tell, correct - a promise is created, rejected without handler, and a
// handler then attached to it. The Node.js REPL doesn't warn in this case, so it's something we
// might want to revisit at a later point and disable warnings for promises created this way.
vm->on_promise_unhandled_rejection = [](auto& promise) {
// FIXME: Optionally make print_value() to print to stderr
js_out("WARNING: A promise was rejected without any handlers");
js_out(" (result: ");
HashTable<JS::Object*> seen_objects;
print_value(promise.result(), seen_objects);
js_outln(")");
};
vm->on_promise_rejection_handled = [](auto& promise) {
// FIXME: Optionally make print_value() to print to stderr
js_out("WARNING: A handler was added to an already rejected promise");
js_out(" (result: ");
HashTable<JS::Object*> seen_objects;
print_value(promise.result(), seen_objects);
js_outln(")");
};
OwnPtr<JS::Interpreter> interpreter;
interrupt_interpreter = [&] {
auto error = JS::Error::create(interpreter->global_object(), "Received SIGINT");
vm->throw_exception(interpreter->global_object(), error);
};
if (script_paths.is_empty()) {
s_print_last_result = true;
interpreter = JS::Interpreter::create<ReplObject>(*vm);
ReplConsoleClient console_client(interpreter->global_object().console());
interpreter->global_object().console().set_client(console_client);
interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
#ifdef JS_TRACK_ZOMBIE_CELLS
interpreter->heap().set_zombify_dead_cells(zombify_dead_cells);
#endif
interpreter->vm().set_underscore_is_last_value(true);
auto& global_environment = interpreter->realm().global_environment();
s_editor = Line::Editor::construct();
s_editor->load_history(s_history_path);
signal(SIGINT, [](int) {
if (!s_editor->is_editing())
sigint_handler();
s_editor->save_history(s_history_path);
});
s_editor->on_display_refresh = [syntax_highlight](Line::Editor& editor) {
auto stylize = [&](Line::Span span, Line::Style styles) {
if (syntax_highlight)
editor.stylize(span, styles);
};
editor.strip_styles();
size_t open_indents = s_repl_line_level;
auto line = editor.line();
JS::Lexer lexer(line);
bool indenters_starting_line = true;
for (JS::Token token = lexer.next(); token.type() != JS::TokenType::Eof; token = lexer.next()) {
auto length = Utf8View { token.value() }.length();
auto start = token.line_column() - 1;
auto end = start + length;
if (indenters_starting_line) {
if (token.type() != JS::TokenType::ParenClose && token.type() != JS::TokenType::BracketClose && token.type() != JS::TokenType::CurlyClose) {
indenters_starting_line = false;
} else {
--open_indents;
}
}
switch (token.category()) {
case JS::TokenCategory::Invalid:
stylize({ start, end, Line::Span::CodepointOriented }, { Line::Style::Foreground(Line::Style::XtermColor::Red), Line::Style::Underline });
break;
case JS::TokenCategory::Number:
stylize({ start, end, Line::Span::CodepointOriented }, { Line::Style::Foreground(Line::Style::XtermColor::Magenta) });
break;
case JS::TokenCategory::String:
stylize({ start, end, Line::Span::CodepointOriented }, { Line::Style::Foreground(Line::Style::XtermColor::Green), Line::Style::Bold });
break;
case JS::TokenCategory::Punctuation:
break;
case JS::TokenCategory::Operator:
break;
case JS::TokenCategory::Keyword:
switch (token.type()) {
case JS::TokenType::BoolLiteral:
case JS::TokenType::NullLiteral:
stylize({ start, end, Line::Span::CodepointOriented }, { Line::Style::Foreground(Line::Style::XtermColor::Yellow), Line::Style::Bold });
break;
default:
stylize({ start, end, Line::Span::CodepointOriented }, { Line::Style::Foreground(Line::Style::XtermColor::Blue), Line::Style::Bold });
break;
}
break;
case JS::TokenCategory::ControlKeyword:
stylize({ start, end, Line::Span::CodepointOriented }, { Line::Style::Foreground(Line::Style::XtermColor::Cyan), Line::Style::Italic });
break;
case JS::TokenCategory::Identifier:
stylize({ start, end, Line::Span::CodepointOriented }, { Line::Style::Foreground(Line::Style::XtermColor::White), Line::Style::Bold });
break;
default:
break;
}
}
editor.set_prompt(prompt_for_level(open_indents));
};
auto complete = [&interpreter, &global_environment](Line::Editor const& editor) -> Vector<Line::CompletionSuggestion> {
auto line = editor.line(editor.cursor());
JS::Lexer lexer { line };
enum {
Initial,
CompleteVariable,
CompleteNullProperty,
CompleteProperty,
} mode { Initial };
StringView variable_name;
StringView property_name;
// we're only going to complete either
// - <N>
// where N is part of the name of a variable
// - <N>.<P>
// where N is the complete name of a variable and
// P is part of the name of one of its properties
auto js_token = lexer.next();
for (; js_token.type() != JS::TokenType::Eof; js_token = lexer.next()) {
switch (mode) {
case CompleteVariable:
switch (js_token.type()) {
case JS::TokenType::Period:
// ...<name> <dot>
mode = CompleteNullProperty;
break;
default:
// not a dot, reset back to initial
mode = Initial;
break;
}
break;
case CompleteNullProperty:
if (js_token.is_identifier_name()) {
// ...<name> <dot> <name>
mode = CompleteProperty;
property_name = js_token.value();
} else {
mode = Initial;
}
break;
case CompleteProperty:
// something came after the property access, reset to initial
case Initial:
if (js_token.type() == JS::TokenType::Identifier) {
// ...<name>...
mode = CompleteVariable;
variable_name = js_token.value();
} else {
mode = Initial;
}
break;
}
}
bool last_token_has_trivia = js_token.trivia().length() > 0;
if (mode == CompleteNullProperty) {
mode = CompleteProperty;
property_name = "";
last_token_has_trivia = false; // <name> <dot> [tab] is sensible to complete.
}
if (mode == Initial || last_token_has_trivia)
return {}; // we do not know how to complete this
Vector<Line::CompletionSuggestion> results;
Function<void(JS::Shape const&, StringView)> list_all_properties = [&results, &list_all_properties](JS::Shape const& shape, auto property_pattern) {
for (auto const& descriptor : shape.property_table()) {
if (!descriptor.key.is_string())
continue;
auto key = descriptor.key.as_string();
if (key.view().starts_with(property_pattern)) {
Line::CompletionSuggestion completion { key, Line::CompletionSuggestion::ForSearch };
if (!results.contains_slow(completion)) { // hide duplicates
results.append(String(key));
}
}
}
if (auto const* prototype = shape.prototype()) {
list_all_properties(prototype->shape(), property_pattern);
}
};
switch (mode) {
case CompleteProperty: {
auto reference_or_error = vm->resolve_binding(variable_name, &global_environment);
if (reference_or_error.is_error())
return {};
auto value_or_error = reference_or_error.value().get_value(interpreter->global_object());
if (value_or_error.is_error())
return {};
auto variable = value_or_error.value();
VERIFY(!variable.is_empty());
if (!variable.is_object())
break;
auto const* object = MUST(variable.to_object(interpreter->global_object()));
auto const& shape = object->shape();
list_all_properties(shape, property_name);
if (results.size())
editor.suggest(property_name.length());
break;
}
case CompleteVariable: {
auto const& variable = interpreter->global_object();
list_all_properties(variable.shape(), variable_name);
for (String& name : global_environment.declarative_record().bindings()) {
if (name.starts_with(variable_name))
results.empend(name);
}
if (results.size())
editor.suggest(variable_name.length());
break;
}
default:
VERIFY_NOT_REACHED();
}
return results;
};
s_editor->on_tab_complete = move(complete);
repl(*interpreter);
s_editor->save_history(s_history_path);
} else {
interpreter = JS::Interpreter::create<ScriptObject>(*vm);
ReplConsoleClient console_client(interpreter->global_object().console());
interpreter->global_object().console().set_client(console_client);
interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
#ifdef JS_TRACK_ZOMBIE_CELLS
interpreter->heap().set_zombify_dead_cells(zombify_dead_cells);
#endif
signal(SIGINT, [](int) {
sigint_handler();
});
StringBuilder builder;
for (auto& path : script_paths) {
auto file = TRY(Core::File::open(path, Core::OpenMode::ReadOnly));
auto file_contents = file->read_all();
auto source = StringView { file_contents };
builder.append(source);
}
StringBuilder source_name_builder;
source_name_builder.join(", ", script_paths);
if (!parse_and_run(*interpreter, builder.string_view(), source_name_builder.string_view()))
return 1;
}
return 0;
}
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