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Full Discussion: How to substitute?
Top Forums Shell Programming and Scripting How to substitute? Post 302268034 by vanitham on Sunday 14th of December 2008 11:12:18 PM
Old 12-15-2008
Hi,

Thanks a lot!!!


Quote:
Originally Posted by drl
Hi.

Here is a start that shows ParseWords:
Code:
#!/usr/bin/perl

# @(#) p1       Demonstrate parsing with quotes, operators AND, OR.
# http://search.cpan.org/~chorny/Text-ParseWords-3.27/ParseWords.pm

use warnings;
use strict;
use Text::ParseWords;

my ($debug);
$debug = 0;
$debug = 1;

my ( $i, $last, $line, @tokens );

while (<>) {
  chomp;
  @tokens = quotewords( '\s+', 0, $_ );
  print " input is :@tokens:\n" if $debug;
  $last = undef;
  foreach $i (@tokens) {
    if ( not defined($last) ) {
      $last = $i;
      print qin($i) . " ";
    }
    elsif ( $i eq "OR" or $i eq "AND" ) {
      $last = $i;
      print qin($i) . " ";
    }
    else {
      if ( $last ne "OR" and $last ne "AND" ) {
        print "AND " . qin($i) . " ";
      }
      else {
        print qin("$i") . " ";
      }
      $last = $i;
    }
  }
  print "\n";
}

print STDERR " ( Lines read: $. )\n" if $debug;

# qin - quote if necessary.

sub qin {
  my ($phrase) = $_[0];
  if ( $phrase =~ / / ) {
    return '"' . $phrase . '"';
  }
  else {
    return $phrase;
  }
}

exit(0);

Producing (on your data in file data1):
Code:
% ./p1 data1
 input is :apple bannana:
apple AND bannana
 input is :apple bannana AND chickko:
apple AND bannana AND chickko
 input is :milk shake OR Graphes orange:
"milk shake" OR Graphes AND orange
 ( Lines read: 3 )

See perldoc Text::ParseWords on your system or obtain from cpan as noted. It takes care of the quoted strings, placing all the tokens in a list.

If the output is not what you desire, feel free to modify or adapt the code as necessary ... cheers, drl
 

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LEARN ABOUT DEBIAN

xml::quote

Quote(3pm)						User Contributed Perl Documentation						Quote(3pm)

NAME

       XML::Quote - XML quote/dequote functions

SYNOPSIS

	 use strict;
	 use XML::Quote qw(:all);

	 my $str=q{666 > 444 & "apple" < 'earth'};
	 print xml_quote($str),"
";
	 # 666 &gt; 444 &amp; &quot;apple&quot; &lt; &apos;earth&apos;

	 my $str2=q{666 &gt; 444 &amp; &quot;apple&quot; &lt; &apos;earth&apos;};
	 print xml_dequote($str2),"
";
	 # 666 > 444 & "apple" < 'earth'

	 my $str3=q{666 > 444 & "apple" < 'earth'};
	 print xml_quote_min($str3),"
";
	 # 666 > 444 &amp; &quot;apple&quot; &lt; 'earth'

DESCRIPTION

       This module provides functions to quote/dequote strings in "xml"-way.

       All functions are written in XS and are very fast; they correctly process utf8, tied, overloaded variables and all the rest of perl
       "magic".

FUNCTIONS

       $quoted = xml_quote($str);
	   This function replaces all occurences of symbols '&', '"', ''', '>', '<' to '&amp;', '&quot;', '&apos;', '&gt;', '&lt;' respectively.

	   Returns quoted string or undef if $str is undef.

       $dequoted = xml_dequote($str);
	   This function replaces all occurences of '&amp;', '&quot;', '&apos;', '&gt;', '&lt;' to '&', '"', ''', '>', '<' respectively.  All
	   other entities (for example &nbsp;) will not be touched.

	   Returns dequoted string or undef if $str is undef.

       $quoted = xml_quote_min($str);
	   This function replaces all occurences of symbols '&', '"', '<' to '&amp;', '&quot;', '&lt;' respectively. Symbols ''' and '>' are not
	   replaced.

	   Returns quoted string or undef if $str is undef.

EXPORT

       xml_quote(), xml_dequote() are exported as default.

PERFORMANCE

       You can use t/benchmark.pl to test the perfomance.  Here is the result on my P4 box.

	 Benchmark: timing 1000000 iterations of perl quote, xs quote...
	 perl quote: 108 wallclock secs (88.08 usr +  0.01 sys = 88.09 CPU) @ 11351.64/s (n=1000000)
	   xs quote: 20 wallclock secs (16.78 usr +  0.00 sys = 16.78 CPU) @ 59591.20/s (n=1000000)

	 Benchmark: timing 1000000 iterations of perl dequote, xs dequote...
	 perl dequote: 106 wallclock secs (85.22 usr +	0.09 sys = 85.31 CPU) @ 11721.54/s (n=1000000)
	   xs dequote: 19 wallclock secs (15.92 usr +  0.02 sys = 15.94 CPU) @ 62743.13/s (n=1000000)

AUTHOR

       Sergey Skvortsov <skv@protey.ru>

SEE ALSO

       http://www.w3.org/TR/REC-xml <http://www.w3.org/TR/REC-xml>, perlre

COPYRIGHT

       Copyright 2003 Sergey Skvortsov <skv@protey.ru>.  All rights reserved.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2008-06-26								Quote(3pm)
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