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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "GMLAutocompleteProvider.h"
#include <AK/QuickSort.h>
#include <LibGUI/GMLLexer.h>
void GMLAutocompleteProvider::provide_completions(Function<void(Vector<Entry>)> callback)
{
auto cursor = m_editor->cursor();
auto text = m_editor->text();
GUI::GMLLexer lexer(text);
// FIXME: Provide a begin() and end() for lexers PLEASE!
auto all_tokens = lexer.lex();
enum State {
Free,
InClassName,
AfterClassName,
InIdentifier,
AfterIdentifier, // Can we introspect this?
} state { Free };
String identifier_string;
Vector<String> class_names;
Vector<State> previous_states;
bool should_push_state { true };
GUI::GMLToken* last_seen_token { nullptr };
for (auto& token : all_tokens) {
auto handle_class_child = [&] {
if (token.m_type == GUI::GMLToken::Type::Identifier) {
state = InIdentifier;
identifier_string = token.m_view;
} else if (token.m_type == GUI::GMLToken::Type::ClassMarker) {
previous_states.append(AfterClassName);
state = Free;
should_push_state = false;
}
};
if (token.m_start.line > cursor.line() || (token.m_start.line == cursor.line() && token.m_start.column > cursor.column()))
break;
last_seen_token = &token;
switch (state) {
case Free:
if (token.m_type == GUI::GMLToken::Type::ClassName) {
if (should_push_state)
previous_states.append(state);
else
should_push_state = true;
state = InClassName;
class_names.append(token.m_view);
break;
}
break;
case InClassName:
if (token.m_type != GUI::GMLToken::Type::LeftCurly) {
// Close empty class and immediately handle our parent's next child
class_names.take_last();
state = previous_states.take_last();
if (state == AfterClassName)
handle_class_child();
break;
}
state = AfterClassName;
break;
case AfterClassName:
handle_class_child();
if (token.m_type == GUI::GMLToken::Type::RightCurly) {
class_names.take_last();
state = previous_states.take_last();
break;
}
break;
case InIdentifier:
if (token.m_type == GUI::GMLToken::Type::Colon)
state = AfterIdentifier;
break;
case AfterIdentifier:
if (token.m_type == GUI::GMLToken::Type::RightCurly || token.m_type == GUI::GMLToken::Type::LeftCurly)
break;
if (token.m_type == GUI::GMLToken::Type::ClassMarker) {
previous_states.append(AfterClassName);
state = Free;
should_push_state = false;
} else {
state = AfterClassName;
}
break;
}
}
if (state == InClassName && last_seen_token && last_seen_token->m_end.line < cursor.line()) {
// Close empty class
class_names.take_last();
state = previous_states.take_last();
}
auto& widget_class = *Core::ObjectClassRegistration::find("GUI::Widget");
Vector<GUI::AutocompleteProvider::Entry> class_entries, identifier_entries;
switch (state) {
case Free:
if (last_seen_token && last_seen_token->m_end.column + 1 != cursor.column() && last_seen_token->m_end.line == cursor.line()) {
// After some token, but with extra space, not on a new line.
// Nothing to put here.
break;
}
Core::ObjectClassRegistration::for_each([&](const Core::ObjectClassRegistration& registration) {
if (!registration.is_derived_from(widget_class))
return;
class_entries.empend(String::formatted("@{}", registration.class_name()), 0u);
});
break;
case InClassName:
if (class_names.is_empty())
break;
if (last_seen_token && last_seen_token->m_end.column + 1 != cursor.column() && last_seen_token->m_end.line == cursor.line()) {
// After a class name, but haven't seen braces.
// TODO: Suggest braces?
break;
}
Core::ObjectClassRegistration::for_each([&](const Core::ObjectClassRegistration& registration) {
if (!registration.is_derived_from(widget_class))
return;
if (registration.class_name().starts_with(class_names.last()))
identifier_entries.empend(registration.class_name(), class_names.last().length());
});
break;
case InIdentifier: {
if (class_names.is_empty())
break;
if (last_seen_token && last_seen_token->m_end.column + 1 != cursor.column() && last_seen_token->m_end.line == cursor.line()) {
// After an identifier, but with extra space
// TODO: Maybe suggest a colon?
break;
}
auto registration = Core::ObjectClassRegistration::find(class_names.last());
if (registration && registration->is_derived_from(widget_class)) {
auto instance = registration->construct();
for (auto& it : instance->properties()) {
if (it.key.starts_with(identifier_string))
identifier_entries.empend(it.key, identifier_string.length());
}
}
if (can_have_declared_layout(class_names.last()) && StringView { "layout" }.starts_with(identifier_string))
identifier_entries.empend("layout", identifier_string.length());
// No need to suggest anything if it's already completely typed out!
if (identifier_entries.size() == 1 && identifier_entries.first().completion == identifier_string)
identifier_entries.clear();
break;
}
case AfterClassName: {
if (last_seen_token && last_seen_token->m_end.line == cursor.line()) {
if (last_seen_token->m_type != GUI::GMLToken::Type::Identifier || last_seen_token->m_end.column + 1 != cursor.column()) {
// Inside braces, but on the same line as some other stuff (and not the continuation of one!)
// The user expects nothing here.
break;
}
}
if (!class_names.is_empty()) {
auto registration = Core::ObjectClassRegistration::find(class_names.last());
if (registration && registration->is_derived_from(widget_class)) {
auto instance = registration->construct();
for (auto& it : instance->properties()) {
if (!it.value->is_readonly())
identifier_entries.empend(it.key, 0u);
}
}
}
Core::ObjectClassRegistration::for_each([&](const Core::ObjectClassRegistration& registration) {
if (!registration.is_derived_from(widget_class))
return;
class_entries.empend(String::formatted("@{}", registration.class_name()), 0u);
});
break;
}
case AfterIdentifier:
if (last_seen_token && last_seen_token->m_end.line != cursor.line()) {
break;
}
if (identifier_string == "layout") {
Core::ObjectClassRegistration::for_each([&](const Core::ObjectClassRegistration& registration) {
if (!registration.is_derived_from(widget_class))
return;
if (registration.class_name().contains("Layout"))
class_entries.empend(String::formatted("@{}", registration.class_name()), 0u);
});
}
break;
default:
break;
}
quick_sort(class_entries, [](auto& a, auto& b) { return a.completion < b.completion; });
quick_sort(identifier_entries, [](auto& a, auto& b) { return a.completion < b.completion; });
Vector<GUI::AutocompleteProvider::Entry> entries;
entries.append(move(identifier_entries));
entries.append(move(class_entries));
callback(move(entries));
}
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