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
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/GenericLexer.h>
#include <AK/Optional.h>
#include <AK/String.h>
#include <LibCore/ArgsParser.h>
#include <LibMain/Main.h>
#include <ctype.h>
#include <stdio.h>
static bool is_octal(int c)
{
return c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6' || c == '7';
}
static ErrorOr<void> generate_character_class(Function<int(int)> oracle, StringBuilder& out)
{
for (int i = 0; i < 128; i++) {
if (oracle(i))
TRY(out.try_append(static_cast<char>(i)));
}
return {};
}
static ErrorOr<String> build_set(StringView specification)
{
StringBuilder out;
GenericLexer lexer(specification);
while (!lexer.is_eof()) {
if (lexer.consume_specific("[:alnum:]"sv))
TRY(generate_character_class(isalnum, out));
else if (lexer.consume_specific("[:blank:]"sv))
TRY(generate_character_class(isblank, out));
else if (lexer.consume_specific("[:digit:]"sv))
TRY(generate_character_class(isdigit, out));
else if (lexer.consume_specific("[:lower:]"sv))
TRY(generate_character_class(islower, out));
else if (lexer.consume_specific("[:punct:]"sv))
TRY(generate_character_class(ispunct, out));
else if (lexer.consume_specific("[:upper:]"sv))
TRY(generate_character_class(isupper, out));
else if (lexer.consume_specific("[:alpha:]"sv))
TRY(generate_character_class(isalpha, out));
else if (lexer.consume_specific("[:cntrl:]"sv))
TRY(generate_character_class(iscntrl, out));
else if (lexer.consume_specific("[:graph:]"sv))
TRY(generate_character_class(isgraph, out));
else if (lexer.consume_specific("[:print:]"sv))
TRY(generate_character_class(isprint, out));
else if (lexer.consume_specific("[:space:]"sv))
TRY(generate_character_class(isspace, out));
else if (lexer.consume_specific("[:xdigit:]"sv))
TRY(generate_character_class(isxdigit, out));
else if (lexer.consume_specific("\\\\"sv))
TRY(out.try_append('\\'));
else if (lexer.consume_specific("\\a"sv))
TRY(out.try_append('\a'));
else if (lexer.consume_specific("\\b"sv))
TRY(out.try_append('\b'));
else if (lexer.consume_specific("\\f"sv))
TRY(out.try_append('\f'));
else if (lexer.consume_specific("\\n"sv))
TRY(out.try_append('\n'));
else if (lexer.consume_specific("\\r"sv))
TRY(out.try_append('\r'));
else if (lexer.consume_specific("\\t"sv))
TRY(out.try_append('\t'));
else if (lexer.consume_specific("\\v"sv))
TRY(out.try_append('\v'));
else if (lexer.next_is('\\') && is_octal(lexer.peek(1))) {
lexer.consume_specific('\\');
int max_left_over = 3;
auto octal_digits = lexer.consume_while([&](char i) -> bool {
return is_octal(i) && max_left_over--;
});
int value = 0;
for (char ch : octal_digits)
value = value * 8 + (ch - '0');
TRY(out.try_append(static_cast<char>(value)));
} else
TRY(out.try_append(lexer.consume(1)));
}
return out.to_string();
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
bool complement_flag = false;
bool delete_flag = false;
bool squeeze_flag = false;
char const* from_chars = nullptr;
char const* to_chars = nullptr;
Core::ArgsParser args_parser;
args_parser.add_option(complement_flag, "Take the complement of the first set", "complement", 'c');
args_parser.add_option(delete_flag, "Delete characters instead of replacing", "delete", 'd');
args_parser.add_option(squeeze_flag, "Omit repeated characters listed in the last given set from the output", "squeeze-repeats", 's');
args_parser.add_positional_argument(from_chars, "Set of characters to translate from", "from");
args_parser.add_positional_argument(to_chars, "Set of characters to translate to", "to", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
bool transform_flag = to_chars && !delete_flag;
if (!transform_flag && !delete_flag && !squeeze_flag) {
warnln("tr: Missing operand");
args_parser.print_usage(stderr, arguments.argv[0]);
return 1;
}
if (delete_flag && squeeze_flag && !to_chars) {
warnln("tr: Combined delete and squeeze operations need two sets of characters");
args_parser.print_usage(stderr, arguments.argv[0]);
return 1;
}
if (delete_flag && !squeeze_flag && to_chars) {
warnln("tr: Only one set of characters may be given when deleting without squeezing");
args_parser.print_usage(stderr, arguments.argv[0]);
return 1;
}
auto from_str = TRY(build_set(from_chars));
if (complement_flag) {
StringBuilder complement_set;
for (int ch = 0; ch < 256; ch++) {
if (!from_str.contains(static_cast<char>(ch)))
TRY(complement_set.try_append(static_cast<char>(ch)));
}
from_str = complement_set.to_string();
}
auto to_str = TRY(build_set(to_chars));
auto squeeze_string = TRY(build_set(to_chars ? to_chars : from_chars));
Optional<char> last_char;
for (;;) {
char ch = fgetc(stdin);
if (feof(stdin))
break;
if (delete_flag) {
if (from_str.contains(ch))
continue;
}
if (transform_flag) {
auto match = from_str.find_last(ch);
if (match.has_value())
ch = to_str[min(match.value(), to_str.length() - 1)];
}
if (squeeze_flag && last_char.has_value() && last_char.value() == ch && squeeze_string.contains(ch))
continue;
last_char = ch;
putchar(ch);
}
return 0;
}
|
