jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2020, the SerenityOS developers.
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/Debug.h>
8#include <LibLine/Editor.h>
9
10namespace {
11constexpr u32 ctrl(char c) { return c & 0x3f; }
12}
13
14namespace Line {
15
16void KeyCallbackMachine::register_key_input_callback(Vector<Key> keys, Function<bool(Editor&)> callback)
17{
18 m_key_callbacks.set(keys, make<KeyCallback>(move(callback)));
19}
20
21void KeyCallbackMachine::key_pressed(Editor& editor, Key key)
22{
23 dbgln_if(CALLBACK_MACHINE_DEBUG, "Key<{}, {}> pressed, seq_length={}, {} things in the matching vector", key.key, key.modifiers, m_sequence_length, m_current_matching_keys.size());
24 if (m_sequence_length == 0) {
25 VERIFY(m_current_matching_keys.is_empty());
26
27 for (auto& it : m_key_callbacks) {
28 if (it.key.first() == key)
29 m_current_matching_keys.append(it.key);
30 }
31
32 if (m_current_matching_keys.is_empty()) {
33 m_should_process_this_key = true;
34 return;
35 }
36 }
37
38 ++m_sequence_length;
39 Vector<Vector<Key>> old_matching_keys;
40 swap(m_current_matching_keys, old_matching_keys);
41
42 for (auto& okey : old_matching_keys) {
43 if (okey.size() < m_sequence_length)
44 continue;
45
46 if (okey[m_sequence_length - 1] == key)
47 m_current_matching_keys.append(okey);
48 }
49
50 if (m_current_matching_keys.is_empty()) {
51 // Insert any keys that were captured
52 if (!old_matching_keys.is_empty()) {
53 auto& keys = old_matching_keys.first();
54 for (size_t i = 0; i < m_sequence_length - 1; ++i)
55 editor.insert(keys[i].key);
56 }
57 m_sequence_length = 0;
58 m_should_process_this_key = true;
59 return;
60 }
61
62 if constexpr (CALLBACK_MACHINE_DEBUG) {
63 dbgln("seq_length={}, matching vector:", m_sequence_length);
64 for (auto& key : m_current_matching_keys) {
65 for (auto& k : key)
66 dbgln(" {}, {}", k.key, k.modifiers);
67 dbgln("");
68 }
69 }
70
71 m_should_process_this_key = false;
72 for (auto& key : m_current_matching_keys) {
73 if (key.size() == m_sequence_length) {
74 m_should_process_this_key = m_key_callbacks.get(key).value()->callback(editor);
75 m_sequence_length = 0;
76 m_current_matching_keys.clear();
77 return;
78 }
79 }
80}
81
82void KeyCallbackMachine::interrupted(Editor& editor)
83{
84 m_sequence_length = 0;
85 m_current_matching_keys.clear();
86 if (auto callback = m_key_callbacks.get({ ctrl('C') }); callback.has_value())
87 m_should_process_this_key = callback.value()->callback(editor);
88 else
89 m_should_process_this_key = true;
90}
91
92}