1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
const es = @import("root");
const std = @import("std");
const Allocator = std.mem.Allocator;
const ArrayList = std.ArrayList;
const File = std.fs.File;
const Key = es.Key;
const KeyReader = @This();
pub const Error = Allocator.Error || File.Reader.Error;
allocator: Allocator,
key_buf: ArrayList(Key),
pub fn init(allocator: Allocator) KeyReader {
return .{
.allocator = allocator,
.key_buf = ArrayList(Key).init(allocator),
};
}
pub fn deinit(self: KeyReader) void {
self.key_buf.deinit();
}
pub fn readKey(self: *KeyReader) Error!Key {
if (self.key_buf.items.len > 0) {
return self.key_buf.pop();
}
const reader = std.io.getStdIn().reader();
const char = try readByteBlocking(reader);
if (char == '\x1b') {
return self.readMetaKey(reader);
} else if (char == '\x9b') {
return self.readControlSequence(reader);
} else {
return Key.char(char);
}
}
fn chooseEscapeKey(final_char: u8) ?Key {
return switch (final_char) {
'A' => Key.up,
'B' => Key.down,
'C' => Key.right,
'D' => Key.left,
'F' => Key.end,
'H' => Key.home,
'Z' => Key.untab,
else => null,
};
}
fn chooseTildeKey(num: usize) ?Key {
return switch (num) {
1 => Key.home,
2 => Key.insert,
3 => Key.delete,
4 => Key.end,
5 => Key.page_up,
6 => Key.page_down,
7 => Key.home,
8 => Key.end,
else => null,
};
}
fn modKey(key: Key, num: usize) ?Key {
return switch (num) {
2 => Key.shift(key),
3 => Key.meta(key),
4 => Key.shift(Key.meta(key)),
5 => Key.ctrl(key),
6 => Key.shift(Key.ctrl(key)),
7 => Key.meta(Key.ctrl(key)),
8 => Key.shift(Key.meta(Key.ctrl(key))),
else => null,
};
}
fn readByte(reader: File.Reader) Error!?u8 {
return reader.readByte() catch |err| switch (err) {
error.WouldBlock => null,
error.EndOfStream => null,
else => return @errSetCast(File.Reader.Error, err),
};
}
// TODO: async
fn readByteBlocking(reader: File.Reader) Error!u8 {
var char = try readByte(reader);
while (char == null) {
std.os.sched_yield() catch {}; // :)
char = try readByte(reader);
}
return char.?;
}
fn readControlSequence(self: *KeyReader, reader: File.Reader) !Key {
var parameters = ArrayList(u8).init(self.allocator);
defer parameters.deinit();
var char = try readByte(reader);
while (char != null and char.? > 0x30 and char.? < 0x3F) : (char = try readByte(reader)) {
try parameters.append(char.?);
}
var intermediates = ArrayList(u8).init(self.allocator);
defer intermediates.deinit();
while (char != null and char.? > 0x20 and char.? < 0x2F) : (char = try readByte(reader)) {
try intermediates.append(char.?);
}
if (char) |final| {
if (final == '~' and intermediates.items.len == 0) {
if (try splitParameters(self.allocator, parameters.items)) |parameter_list| {
defer self.allocator.free(parameter_list);
if (chooseTildeKey(parameter_list[0])) |key| {
if (parameter_list.len == 1) {
return key;
} else if (parameter_list.len == 2) {
if (modKey(key, parameter_list[1])) |mod_key| {
return mod_key;
}
}
}
}
} else if (intermediates.items.len == 0) {
if (chooseEscapeKey(final)) |key| {
if (try splitParameters(self.allocator, parameters.items)) |parameter_list| {
defer self.allocator.free(parameter_list);
if (parameter_list.len == 0) {
return key;
} else if (parameter_list.len == 1) {
var count = std.math.max(1, parameter_list[0]) - 1;
try self.key_buf.ensureUnusedCapacity(count);
while (count > 0) : (count -= 1) {
self.key_buf.appendAssumeCapacity(key);
}
return key;
} else if (parameter_list.len == 2) {
var count = std.math.max(1, parameter_list[0]) - 1;
if (modKey(key, parameter_list[1])) |mod_key| {
try self.key_buf.ensureUnusedCapacity(count);
while (count > 0) : (count -= 1) {
self.key_buf.appendAssumeCapacity(mod_key);
}
return mod_key;
}
}
}
}
}
std.log.err(
"Unknown terminal sequence '^[[{s}{s}{c}'",
.{parameters.items, intermediates.items, final},
);
try self.key_buf.ensureUnusedCapacity(parameters.items.len + intermediates.items.len + 1);
self.key_buf.appendAssumeCapacity(Key.char(final));
} else if (parameters.items.len == 0 and intermediates.items.len == 0) {
return Key.meta('[');
} else {
std.log.err(
"Unknown terminal sequence '^[[{s}{s}'",
.{parameters.items, intermediates.items},
);
}
try self.key_buf.ensureUnusedCapacity(parameters.items.len + intermediates.items.len);
while (intermediates.items.len > 0) {
self.key_buf.appendAssumeCapacity(Key.char(intermediates.pop()));
}
while (parameters.items.len > 0) {
self.key_buf.appendAssumeCapacity(Key.char(parameters.pop()));
}
return Key.meta('[');
}
fn readMetaKey(self: *KeyReader, reader: File.Reader) Error!Key {
if (try readByte(reader)) |char| {
if (char == '[') {
return self.readControlSequence(reader);
} else {
return Key.meta(char);
}
} else {
return Key.escape;
}
}
fn splitParameters(allocator: Allocator, parameters_string: []const u8) Allocator.Error!?[]usize {
var parameters = try ArrayList(usize).initCapacity(allocator, parameters_string.len / 2);
defer parameters.deinit();
var it = std.mem.split(u8, parameters_string, ";");
while (it.next()) |parameter_string| {
if (parameter_string.len == 0) {
// TODO: Default value
try parameters.append(1);
} else {
const parameter = std.fmt.parseUnsigned(
usize,
parameter_string,
10,
) catch { return null; };
try parameters.append(parameter);
}
}
return parameters.toOwnedSlice();
}
|
