Good day, monks..
I'm working on a small parser and in this script I require a function that would be able to return a special 'escape' (excuse me for poor jargon) character (such as'\U' etc) based on the case of a string passed to the sub as the first parameter. So, if my string is in uppercase, the subroutine should return '\U', it should return '\L' otherwise.
For example,
my $esc_char = get_escape_case("S");
would return '\U' escape character. I may then use it (or so I hope to) to format any other string (either uppercase or lowercase it) by simply prepending the escape character in an expression like this:
my $case_formatted_string = $esc_char ."FoobAr";
In this example (where $esc_char is '\U') $case_formatted_string should become 'FOOBAR' (since "S" is in uppercase).
The only problem that I'm facing now is how do I actually apply this escape character to a string? I've tried one obvious way in a sample code below but it didn't work:
use strict;
# determine case of a character
# and return appropriate 'control' code.
sub get_escape_case
{
my ($char) = @_;
if ($char eq "\U$char") {
return '\U';
} else {
return '\L';
}
}
# this wouldn't work...
print get_escape_case("S")."stuff\n";
# while this works..
print "\Ustuff\n";
I guess I might have to use a special 'code' for the escape character? Could anyone lead me in the right path? Thank you. ;-)
"There is no system but GNU, and Linux is one of its kernels." -- Confession of Faith
|
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.