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Utilities/tr: Rework squeezing to be supported during more operations

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Tim Schumacher 2021-11-13 12:17:40 +01:00 committed by Andreas Kling
parent 3c98a9430b
commit 2e8330f78c
Notes: sideshowbarker 2024-07-18 01:10:41 +09:00 
Author: https://github.com/timschumi
Commit: https://github.com/SerenityOS/serenity/commit/2e8330f78cf
Pull-request: https://github.com/SerenityOS/serenity/pull/10904
2 changed files with 39 additions and 25 deletions
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2
Base/usr/share/man/man1/tr.md
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@ -14,7 +14,7 @@ $ tr [--complement] [--delete] [--squeeze-repeats] <from> [to]
* `--version`: Print version
* `-c`, `--complement`: Take the complement of the first set
* `-d`, `--delete`: Delete characters instead of replacing
* `-s`, `--squeeze-repeats`: Omit repeated characters listed in the 'to' set from the output
* `-s`, `--squeeze-repeats`: Omit repeated characters listed in the last given set from the output
## Arguments:

62
Userland/Utilities/tr.cpp
View File

@ -92,19 +92,34 @@ int main(int argc, char** argv)
{
bool complement_flag = false;
bool delete_flag = false;
bool squeeze_repeats = false;
bool squeeze_flag = false;
const char* from_chars = nullptr;
const char* 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_repeats, "Omit repeated characters listed in the 'to' set from the output", "squeeze-repeats", 's');
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(argc, argv);
if (!to_chars && !delete_flag) {
bool transform_flag = to_chars && !delete_flag;
if (!transform_flag && !delete_flag && !squeeze_flag) {
warnln("tr: Missing operand");
args_parser.print_usage(stderr, 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, 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, argv[0]);
return 1;
}
@ -119,32 +134,31 @@ int main(int argc, char** argv)
from_str = complement_set.to_string();
}
if (delete_flag) {
for (;;) {
char ch = fgetc(stdin);
if (feof(stdin))
break;
if (!from_str.contains(ch))
putchar(ch);
}
} else {
auto to_str = build_set(to_chars);
Optional<char> last_char;
auto to_str = build_set(to_chars);
String squeeze_string = build_set(to_chars ? to_chars : from_chars);
Optional<char> last_char;
for (;;) {
char ch = fgetc(stdin);
if (feof(stdin))
break;
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_repeats && last_char.has_value() && last_char.value() == ch)
continue;
last_char = ch;
putchar(ch);
}
if (squeeze_flag && last_char.has_value() && last_char.value() == ch && squeeze_string.contains(ch))
continue;
last_char = ch;
putchar(ch);
}
return 0;