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mirror of git://git.suckless.org/sbase synced 2024-12-23 07:25:07 +00:00

Add trivial equivalence class support in tr(1) and update manpage

Equivalence classes are a hard matter and there's still no "standard"
way to solve the issue.
Previously, tr would just skip those classes, but it's much
better when it resolves a [=c=] to a normal c instead of treating
it as a literal.

Also, reflect recent changes in the manpage (octal escapes) and fix
the markup in some areas.
This commit is contained in:
FRIGN 2015-01-28 19:44:05 +01:00
parent 63d7f29bd9
commit ee6f7d3fc0
2 changed files with 18 additions and 7 deletions

19
tr.1
View File

@ -25,22 +25,27 @@ Squeeze repeated characters matching
.Ar set1
or
.Ar set2
if -d is set.
if
.Fl d
is set.
.El
.Sh SET
.Bl -tag -width Ds
.It Literal 'c'
.It Escape sequence '\ec'
\e\e, \ea, \eb, \ef, \en, \er, \et, \ev
.It Range 'c-d'
.It Repeat '[c*n]'
.It Literal Sy c
.It Escape sequence Sy \ec
\e\e, \ea, \eb, \ef, \en, \er, \et, \ev, \eO[OO]
.It Range Sy c-d
.It Repeat Sy [c*n]
Only in
.Ar set2 .
If n = 0 or left out, set n to length of
.Ar set1 .
.It Character class '[:class:]'
.It Character class Sy [:class:]
See
.Xr wctype 3 .
.It Equivalence class Sy [=c=]
Resolve to
.Sy c .
.El
.Sh TRANSLATION
If no options are specified,

6
tr.c
View File

@ -143,6 +143,12 @@ nextbrack:
/* CLASSES [=EQUIV=] (skip) */
if (j - i > 3 && rstr[i + 1] == '=' && rstr[m - 1] == '=') {
if (j - i != 4)
goto literal;
(*set)[setranges].start = rstr[i + 2];
(*set)[setranges].end = rstr[i + 2];
(*set)[setranges].quant = 1;
setranges++;
i = j;
continue;
}