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/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/DeprecatedString.h>
#include <AK/Forward.h>
#include <AK/Utf32View.h>
#include <AK/Utf8View.h>
#include <LibLine/Style.h>
namespace Line {
// FIXME: These objects are pretty heavy since they store two copies of text
// somehow get rid of one.
struct CompletionSuggestion {
private:
struct ForSearchTag {
};
public:
static constexpr ForSearchTag ForSearch {};
// Intentionally not explicit. (To allow suggesting bare strings)
CompletionSuggestion(DeprecatedString const& completion)
: CompletionSuggestion(completion, ""sv, {})
{
}
CompletionSuggestion(DeprecatedString const& completion, ForSearchTag)
: text_string(completion)
{
}
CompletionSuggestion(StringView completion, StringView trailing_trivia, StringView display_trivia = ""sv)
: CompletionSuggestion(completion, trailing_trivia, display_trivia, {})
{
}
CompletionSuggestion(StringView completion, StringView trailing_trivia, StringView display_trivia, Style style);
bool operator==(CompletionSuggestion const& suggestion) const
{
return suggestion.text_string == text_string;
}
Vector<u32> text;
Vector<u32> trailing_trivia;
Vector<u32> display_trivia;
Style style;
size_t start_index { 0 };
size_t input_offset { 0 };
size_t static_offset { 0 };
size_t invariant_offset { 0 };
bool allow_commit_without_listing { true };
Utf32View text_view;
Utf32View trivia_view;
Utf32View display_trivia_view;
DeprecatedString text_string;
DeprecatedString display_trivia_string;
bool is_valid { false };
};
class SuggestionManager {
friend class Editor;
public:
void set_suggestions(Vector<CompletionSuggestion>&& suggestions);
void set_current_suggestion_initiation_index(size_t start_index);
size_t count() const { return m_suggestions.size(); }
size_t display_length() const { return m_last_shown_suggestion_display_length; }
size_t start_index() const { return m_last_displayed_suggestion_index; }
size_t next_index() const { return m_next_suggestion_index; }
void set_start_index(size_t index) const { m_last_displayed_suggestion_index = index; }
ErrorOr<size_t> for_each_suggestion(Function<ErrorOr<IterationDecision>(CompletionSuggestion const&, size_t)>) const;
enum CompletionMode {
DontComplete,
CompletePrefix,
ShowSuggestions,
CycleSuggestions,
};
class CompletionAttemptResult {
public:
CompletionMode new_completion_mode;
ssize_t new_cursor_offset { 0 };
struct {
size_t start;
size_t end;
} offset_region_to_remove { 0, 0 }; // The region to remove as defined by [start, end) translated by (old_cursor + new_cursor_offset)
// This bit of data will be removed, but restored if the suggestion is rejected.
size_t static_offset_from_cursor { 0 };
Vector<Utf32View> insert {};
Optional<Style> style_to_apply {};
bool avoid_committing_to_single_suggestion { false };
};
CompletionAttemptResult attempt_completion(CompletionMode, size_t initiation_start_index);
void next();
void previous();
CompletionSuggestion const& suggest();
CompletionSuggestion const& current_suggestion() const { return m_last_shown_suggestion; }
bool is_current_suggestion_complete() const { return m_last_shown_suggestion_was_complete; }
void reset()
{
m_last_shown_suggestion = DeprecatedString::empty();
m_last_shown_suggestion_display_length = 0;
m_suggestions.clear();
m_last_displayed_suggestion_index = 0;
m_next_suggestion_index = 0;
}
private:
SuggestionManager()
{
}
Vector<CompletionSuggestion> m_suggestions;
CompletionSuggestion m_last_shown_suggestion { DeprecatedString::empty() };
size_t m_last_shown_suggestion_display_length { 0 };
bool m_last_shown_suggestion_was_complete { false };
mutable size_t m_next_suggestion_index { 0 };
size_t m_largest_common_suggestion_prefix_length { 0 };
mutable size_t m_last_displayed_suggestion_index { 0 };
size_t m_selected_suggestion_index { 0 };
};
}
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