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ladybird/Userland/js.cpp
Andreas Kling 6861c619c6 LibJS: Move most of Interpreter into VM 
This patch moves the exception state, call stack and scope stack from
Interpreter to VM. I'm doing this to help myself discover what the
split between Interpreter and VM should be, by shuffling things around
and seeing what falls where.

With these changes, we no longer have a persistent lexical environment
for the current global object on the Interpreter's call stack. Instead,
we push/pop that environment on Interpreter::run() enter/exit.
Since it should only be used to find the global "this", and not for
variable storage (that goes directly into the global object instead!),
I had to insert some short-circuiting when walking the environment
parent chain during variable lookup.

Note that this is a "stepping stone" commit, not a final design.
2020-09-27 20:26:58 +02:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/ByteBuffer.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/StringBuilder.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibJS/AST.h>
#include <LibJS/Console.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Parser.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Date.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/Value.h>
#include <LibLine/Editor.h>
#include <signal.h>
#include <stdio.h>
RefPtr<JS::VM> vm;
Vector<String> repl_statements;
class ReplObject : public JS::GlobalObject {
public:
ReplObject();
virtual void initialize() override;
virtual ~ReplObject() override;
private:
virtual const char* class_name() const override { return "ReplObject"; }
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);
};
static bool s_dump_ast = false;
static bool s_print_last_result = false;
static RefPtr<Line::Editor> s_editor;
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);
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 void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects);
static void print_array(JS::Array& array, HashTable<JS::Object*>& seen_objects)
{
bool first = true;
fputs("[ ", stdout);
for (auto it = array.indexed_properties().begin(false); it != array.indexed_properties().end(); ++it) {
if (!first)
fputs(", ", stdout);
first = false;
auto value = it.value_and_attributes(&array).value;
// 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 (vm->exception())
return;
print_value(value, seen_objects);
}
fputs(" ]", stdout);
}
static void print_object(JS::Object& object, HashTable<JS::Object*>& seen_objects)
{
fputs("{ ", stdout);
bool first = true;
for (auto& entry : object.indexed_properties()) {
if (!first)
fputs(", ", stdout);
first = false;
printf("\"\033[33;1m%d\033[0m\": ", entry.index());
auto value = entry.value_and_attributes(&object).value;
// 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 (vm->exception())
return;
print_value(value, seen_objects);
}
if (!object.indexed_properties().is_empty() && object.shape().property_count())
fputs(", ", stdout);
size_t index = 0;
for (auto& it : object.shape().property_table_ordered()) {
if (it.key.is_string()) {
printf("\"\033[33;1m%s\033[0m\": ", it.key.to_display_string().characters());
} else {
printf("\033[33;1m%s\033[0m: ", it.key.to_display_string().characters());
}
print_value(object.get_direct(it.value.offset), seen_objects);
if (index != object.shape().property_count() - 1)
fputs(", ", stdout);
++index;
}
fputs(" }", stdout);
}
static void print_function(const JS::Object& function, HashTable<JS::Object*>&)
{
printf("\033[34;1m[%s]\033[0m", function.class_name());
}
static void print_date(const JS::Object& date, HashTable<JS::Object*>&)
{
printf("\033[34;1mDate %s\033[0m", static_cast<const JS::Date&>(date).string().characters());
}
static void print_error(const JS::Object& object, HashTable<JS::Object*>&)
{
auto& error = static_cast<const JS::Error&>(object);
printf("\033[34;1m[%s]\033[0m", error.name().characters());
if (!error.message().is_empty())
printf(": %s", error.message().characters());
}
static void print_regexp(const JS::Object& object, HashTable<JS::Object*>&)
{
auto& regexp = static_cast<const JS::RegExpObject&>(object);
printf("\033[34;1m/%s/%s\033[0m", regexp.content().characters(), regexp.flags().characters());
}
static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects)
{
if (value.is_empty()) {
printf("\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.
printf("<already printed Object %p>", &value.as_object());
return;
}
seen_objects.set(&value.as_object());
}
if (value.is_array())
return print_array(static_cast<JS::Array&>(value.as_object()), seen_objects);
if (value.is_object()) {
auto& object = value.as_object();
if (object.is_function())
return print_function(object, seen_objects);
if (object.is_date())
return print_date(object, seen_objects);
if (object.is_error())
return print_error(object, seen_objects);
if (object.is_regexp_object())
return print_regexp(object, seen_objects);
return print_object(object, seen_objects);
}
if (value.is_string())
printf("\033[32;1m");
else if (value.is_number() || value.is_bigint())
printf("\033[35;1m");
else if (value.is_boolean())
printf("\033[33;1m");
else if (value.is_null())
printf("\033[33;1m");
else if (value.is_undefined())
printf("\033[34;1m");
if (value.is_string())
putchar('"');
printf("%s", value.to_string_without_side_effects().characters());
if (value.is_string())
putchar('"');
printf("\033[0m");
}
static void print(JS::Value value)
{
HashTable<JS::Object*> seen_objects;
print_value(value, seen_objects);
putchar('\n');
}
static bool file_has_shebang(AK::ByteBuffer file_contents)
{
if (file_contents.size() >= 2 && file_contents[0] == '#' && file_contents[1] == '!')
return true;
return false;
}
static StringView strip_shebang(AK::ByteBuffer file_contents)
{
size_t i = 0;
for (i = 2; i < file_contents.size(); ++i) {
if (file_contents[i] == '\n')
break;
}
return StringView((const char*)file_contents.data() + i, file_contents.size() - i);
}
static bool write_to_file(const StringView& path)
{
int fd = open_with_path_length(path.characters_without_null_termination(), path.length(), 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, const StringView& source)
{
auto parser = JS::Parser(JS::Lexer(source));
auto program = parser.parse_program();
if (s_dump_ast)
program->dump(0);
if (parser.has_errors()) {
auto error = parser.errors()[0];
auto hint = error.source_location_hint(source);
if (!hint.is_empty())
printf("%s\n", hint.characters());
vm->throw_exception<JS::SyntaxError>(interpreter.global_object(), error.to_string());
} else {
interpreter.run(interpreter.global_object(), *program);
}
if (vm->exception()) {
printf("Uncaught exception: ");
print(vm->exception()->value());
auto trace = vm->exception()->trace();
if (trace.size() > 1) {
for (auto& function_name : trace)
printf(" -> %s\n", function_name.characters());
}
vm->clear_exception();
return false;
}
if (s_print_last_result)
print(vm->last_value());
return true;
}
ReplObject::ReplObject()
{
}
void ReplObject::initialize()
{
GlobalObject::initialize();
define_property("global", this, JS::Attribute::Enumerable);
define_native_function("exit", exit_interpreter);
define_native_function("help", repl_help);
define_native_function("load", load_file, 1);
define_native_function("save", save_to_file, 1);
}
ReplObject::~ReplObject()
{
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::save_to_file)
{
if (!interpreter.argument_count())
return JS::Value(false);
String save_path = interpreter.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 (!interpreter.argument_count())
exit(0);
auto exit_code = interpreter.argument(0).to_number(interpreter);
if (::vm->exception())
return {};
exit(exit_code.as_double());
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::repl_help)
{
printf("REPL commands:\n");
printf(" exit(code): exit the REPL with specified code. Defaults to 0.\n");
printf(" help(): display this menu\n");
printf(" load(files): accepts file names as params to load into running session. For example load(\"js/1.js\", \"js/2.js\", \"js/3.js\")\n");
printf(" save(file): accepts a file name, writes REPL input history to a file. For example: save(\"foo.txt\")\n");
return JS::js_undefined();
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::load_file)
{
if (!interpreter.argument_count())
return JS::Value(false);
for (auto& file : interpreter.call_frame().arguments) {
String file_name = file.as_string().string();
auto js_file = Core::File::construct(file_name);
if (!js_file->open(Core::IODevice::ReadOnly)) {
fprintf(stderr, "Failed to open %s: %s\n", file_name.characters(), js_file->error_string());
}
auto file_contents = js_file->read_all();
StringView source;
if (file_has_shebang(file_contents)) {
source = strip_shebang(file_contents);
} else {
source = file_contents;
}
parse_and_run(interpreter, source);
}
return JS::Value(true);
}
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);
}
}
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 JS::Value log() override
{
puts(interpreter().vm().join_arguments().characters());
return JS::js_undefined();
}
virtual JS::Value info() override
{
printf("(i) %s\n", interpreter().vm().join_arguments().characters());
return JS::js_undefined();
}
virtual JS::Value debug() override
{
printf("\033[36;1m");
puts(interpreter().vm().join_arguments().characters());
printf("\033[0m");
return JS::js_undefined();
}
virtual JS::Value warn() override
{
printf("\033[33;1m");
puts(interpreter().vm().join_arguments().characters());
printf("\033[0m");
return JS::js_undefined();
}
virtual JS::Value error() override
{
printf("\033[31;1m");
puts(interpreter().vm().join_arguments().characters());
printf("\033[0m");
return JS::js_undefined();
}
virtual JS::Value clear() override
{
printf("\033[3J\033[H\033[2J");
fflush(stdout);
return JS::js_undefined();
}
virtual JS::Value trace() override
{
puts(interpreter().vm().join_arguments().characters());
auto trace = get_trace();
for (auto& function_name : trace) {
if (function_name.is_empty())
function_name = "<anonymous>";
printf(" -> %s\n", function_name.characters());
}
return JS::js_undefined();
}
virtual JS::Value count() override
{
auto label = interpreter().argument_count() ? interpreter().argument(0).to_string_without_side_effects() : "default";
auto counter_value = m_console.counter_increment(label);
printf("%s: %u\n", label.characters(), counter_value);
return JS::js_undefined();
}
virtual JS::Value count_reset() override
{
auto label = interpreter().argument_count() ? interpreter().argument(0).to_string_without_side_effects() : "default";
if (m_console.counter_reset(label)) {
printf("%s: 0\n", label.characters());
} else {
printf("\033[33;1m");
printf("\"%s\" doesn't have a count\n", label.characters());
printf("\033[0m");
}
return JS::js_undefined();
}
};
int main(int argc, char** argv)
{
bool gc_on_every_allocation = false;
bool disable_syntax_highlight = false;
const char* script_path = nullptr;
Core::ArgsParser args_parser;
args_parser.add_option(s_dump_ast, "Dump the AST", "dump-ast", 'A');
args_parser.add_option(s_print_last_result, "Print last result", "print-last-result", 'l');
args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
args_parser.add_option(disable_syntax_highlight, "Disable live syntax highlighting", "no-syntax-highlight", 's');
args_parser.add_positional_argument(script_path, "Path to script file", "script", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
bool syntax_highlight = !disable_syntax_highlight;
vm = JS::VM::create();
OwnPtr<JS::Interpreter> interpreter;
interrupt_interpreter = [&] {
auto error = JS::Error::create(interpreter->global_object(), "Error", "Received SIGINT");
vm->throw_exception(interpreter->global_object(), error);
};
if (script_path == nullptr) {
s_print_last_result = true;
interpreter = JS::Interpreter::create<ReplObject>(*vm);
ReplConsoleClient console_client(interpreter->console());
interpreter->console().set_client(console_client);
interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
interpreter->vm().set_underscore_is_last_value(true);
s_editor = Line::Editor::construct();
signal(SIGINT, [](int) {
if (!s_editor->is_editing())
sigint_handler();
});
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 = 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.type()) {
case JS::TokenType::Invalid:
case JS::TokenType::Eof:
stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Red), Line::Style::Underline });
break;
case JS::TokenType::NumericLiteral:
case JS::TokenType::BigIntLiteral:
stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Magenta) });
break;
case JS::TokenType::StringLiteral:
case JS::TokenType::TemplateLiteralStart:
case JS::TokenType::TemplateLiteralEnd:
case JS::TokenType::TemplateLiteralString:
case JS::TokenType::RegexLiteral:
case JS::TokenType::RegexFlags:
case JS::TokenType::UnterminatedStringLiteral:
case JS::TokenType::UnterminatedRegexLiteral:
stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Green), Line::Style::Bold });
break;
case JS::TokenType::BracketClose:
case JS::TokenType::BracketOpen:
case JS::TokenType::Comma:
case JS::TokenType::CurlyClose:
case JS::TokenType::CurlyOpen:
case JS::TokenType::ParenClose:
case JS::TokenType::ParenOpen:
case JS::TokenType::Semicolon:
case JS::TokenType::Period:
break;
case JS::TokenType::Ampersand:
case JS::TokenType::AmpersandEquals:
case JS::TokenType::Asterisk:
case JS::TokenType::DoubleAsteriskEquals:
case JS::TokenType::AsteriskEquals:
case JS::TokenType::Caret:
case JS::TokenType::CaretEquals:
case JS::TokenType::DoubleAmpersand:
case JS::TokenType::DoubleAsterisk:
case JS::TokenType::DoublePipe:
case JS::TokenType::DoubleQuestionMark:
case JS::TokenType::Equals:
case JS::TokenType::EqualsEquals:
case JS::TokenType::EqualsEqualsEquals:
case JS::TokenType::ExclamationMark:
case JS::TokenType::ExclamationMarkEquals:
case JS::TokenType::ExclamationMarkEqualsEquals:
case JS::TokenType::GreaterThan:
case JS::TokenType::GreaterThanEquals:
case JS::TokenType::LessThan:
case JS::TokenType::LessThanEquals:
case JS::TokenType::Minus:
case JS::TokenType::MinusEquals:
case JS::TokenType::MinusMinus:
case JS::TokenType::Percent:
case JS::TokenType::PercentEquals:
case JS::TokenType::Pipe:
case JS::TokenType::PipeEquals:
case JS::TokenType::Plus:
case JS::TokenType::PlusEquals:
case JS::TokenType::PlusPlus:
case JS::TokenType::QuestionMark:
case JS::TokenType::QuestionMarkPeriod:
case JS::TokenType::ShiftLeft:
case JS::TokenType::ShiftLeftEquals:
case JS::TokenType::ShiftRight:
case JS::TokenType::ShiftRightEquals:
case JS::TokenType::Slash:
case JS::TokenType::SlashEquals:
case JS::TokenType::Tilde:
case JS::TokenType::UnsignedShiftRight:
case JS::TokenType::UnsignedShiftRightEquals:
break;
case JS::TokenType::BoolLiteral:
case JS::TokenType::NullLiteral:
stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Yellow), Line::Style::Bold });
break;
case JS::TokenType::Class:
case JS::TokenType::Const:
case JS::TokenType::Debugger:
case JS::TokenType::Delete:
case JS::TokenType::Extends:
case JS::TokenType::Function:
case JS::TokenType::In:
case JS::TokenType::Instanceof:
case JS::TokenType::Interface:
case JS::TokenType::Let:
case JS::TokenType::New:
case JS::TokenType::Super:
case JS::TokenType::TemplateLiteralExprStart:
case JS::TokenType::TemplateLiteralExprEnd:
case JS::TokenType::Throw:
case JS::TokenType::Typeof:
case JS::TokenType::Var:
case JS::TokenType::Void:
stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Blue), Line::Style::Bold });
break;
case JS::TokenType::Await:
case JS::TokenType::Case:
case JS::TokenType::Catch:
case JS::TokenType::Do:
case JS::TokenType::Else:
case JS::TokenType::Finally:
case JS::TokenType::For:
case JS::TokenType::If:
case JS::TokenType::Return:
case JS::TokenType::Switch:
case JS::TokenType::Try:
case JS::TokenType::While:
case JS::TokenType::Yield:
stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Cyan), Line::Style::Italic });
break;
case JS::TokenType::Identifier:
stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::White), Line::Style::Bold });
default:
break;
}
}
editor.set_prompt(prompt_for_level(open_indents));
};
auto complete = [&interpreter](const Line::Editor& 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.is_identifier_name()) {
// ...<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(const JS::Shape&, const StringView&)> list_all_properties = [&results, &list_all_properties](const JS::Shape& shape, auto& property_pattern) {
for (const auto& 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(key);
}
}
}
if (const auto* prototype = shape.prototype()) {
list_all_properties(prototype->shape(), property_pattern);
}
};
switch (mode) {
case CompleteProperty: {
auto maybe_variable = vm->get_variable(variable_name, interpreter->global_object());
if (maybe_variable.is_empty()) {
maybe_variable = interpreter->global_object().get(FlyString(variable_name));
if (maybe_variable.is_empty())
break;
}
auto variable = maybe_variable;
if (!variable.is_object())
break;
const auto* object = variable.to_object(*interpreter, interpreter->global_object());
const auto& shape = object->shape();
list_all_properties(shape, property_name);
if (results.size())
editor.suggest(property_name.length());
break;
}
case CompleteVariable: {
const auto& variable = interpreter->global_object();
list_all_properties(variable.shape(), variable_name);
if (results.size())
editor.suggest(variable_name.length());
break;
}
default:
ASSERT_NOT_REACHED();
}
return results;
};
s_editor->on_tab_complete = move(complete);
repl(*interpreter);
} else {
interpreter = JS::Interpreter::create<JS::GlobalObject>(*vm);
ReplConsoleClient console_client(interpreter->console());
interpreter->console().set_client(console_client);
interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
signal(SIGINT, [](int) {
sigint_handler();
});
auto file = Core::File::construct(script_path);
if (!file->open(Core::IODevice::ReadOnly)) {
fprintf(stderr, "Failed to open %s: %s\n", script_path, file->error_string());
return 1;
}
auto file_contents = file->read_all();
StringView source;
if (file_has_shebang(file_contents)) {
source = strip_shebang(file_contents);
} else {
source = file_contents;
}
if (!parse_and_run(*interpreter, source))
return 1;
}
return 0;
}
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