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Perl scripting


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Perl Perl simple search engine
Perl simple search engine

1. The program

#!C:/Perl/bin/perl.exe -w use strict; use File::Find; use vars qw($DEBUGGING $basedir $baseurl @files $title $title_url search_url @blocked $emulate_matts_code $style $charset $E $count $page); use CGI qw(:standard); use CGI qw(param); $search_url = 'http://localhost:8033/PERL/index.html'; my $query = param("query"); #print header(); # --------------------------- sub start_of_html() { print "Content-Type: text/html; charset=charset\n\n"; print <<END_HTML; <head> <title>The results of the search</title> </head> <body> <center><table width="500" border="0" cellpadding="0" cellspacing="0" bgcolor="#c5e6ef"> <tr> <td height="19" valign="top" bgcolor="#00CCCC"> <font size="2" face="Verdana, Arial, Helvetica, sans-serif" color="#ffffff"> <h3><b>Your searched words:</b>       $query<h3></font></td> </tr> </table></center> <BR> <center><table width="75%" border="0" cellpadding="8" cellspacing="0"> <tr> <td width="341" height="23" valign="top" bgcolor="9b72cf"> <font face="Verdana, Arial, Helvetica, sans-serif" color="#990000" size="3"><b> <font face="Geneva, Arial, Helvetica, san-serif" color="#ffffff"> Results of Search: </font></b></font> </td> </tr> </table></center> <center><table width="75%" border="0" cellpadding="8" cellspacing="0"> <tr> <td valign="top" height="99" bgcolor="#f1f1fd"> END_HTML } # --------------------------- sub subroutine1(%query) { return if($_ =~ /^\./); return unless($_ =~ /\.html/i); stat $File::Find::name; return if -d; return unless -r; open(FILE, "< $File::Find::name") or return; my $string = <FILE>; close (FILE); return unless ($string =~ /\Q$query\E/i); my $page = $_; if($string =~ /<title>(.*?)<\/title>/is) { $page = $1; $count++; #$File::Find::name =~ tr/c/C/; #$File::Find::name =~ tr/\//\\/; print qq"<li><a href=\"$File::Find::name\">$page< /a></b></li>\n"; } } # --------------------------- sub count { #if($page eq ''){ if($count == 0 && $query ne ''){ print "<b>There are no maching files .. </b>"; } } # --------------------------- sub end_of_html (){ print <<END_HTML; </td> </tr> <center></table> <BR> <BR> <center><table width="75%" border="0" cellpadding="8" cellspacing="0" bgcolor="#c5e6ef" > <tr> <td> <a href= $search_url>Back to home page </a></li> </td> </tr> </table></center> </body> </html> END_HTML } start_of_html(); &subroutine1; if ($query){ find(\&subroutine1, './'); } elsif ($query == ''){ print "<b>No words have been entered .</b>"; } count(); end_of_html(); # ---------------------------

2. The related steps:

1. Query to send

#!perl -w Tells the script where the Perl interpreter is located, The "-w" options is used to activate the warnings mode. use strict; To load the "strict" pragma. use CGI qw(:standard); Load the CGI module, using the standard functional interface. In independent file emgile.html for instance, write the following form: <form action="search.pl" method="post"> <input type="text" name="query" size="50" /> <input type="submit" /> </form> It will send to the file search.pl(ou.cgi), by te method "POST" the named "query", by the button "submit". To retrieve the form data, that is "query", we use this with the CGIs "param" function, present in the CGI module. my $query = param("query"); Finally, we want to print this value to the browser, Before we do that, however, we need to To have the results in an html output at a browser, we print a contenttype header. If we want to use the CGI's contenttype header, we write: print header(); We can load also the functions from the CGI's module: print start_html(); and print end_html()

2. Finding the files

We will go through the directories and open the correct found types of files by using the File::Find module that exports a function Find(). This function Find() takes two arguments: - a subroutine: list of instructions of what related to each file and - a starting directory: each file in the directory and its subdirectories This function "Find()" returns filenames, their path , and so on ... returning a bunch of information to us (such as filename, path, etc) for each. You'll notice that $query is still there, as well as header() and start_html(). Youll also notice that we used the File::Find module similarly to the way we used CGI. Next, lets output a document title: find( sub { # code of the sunroutine goes here ... }, 'starting directory'); We can also use the following code: find(&a_routine, 'starting directory'); and describe the subroutine: sub a_routine{ # code of the subroutine goes here ... } Let's full our subroutine: find( sub { return if ($_ =~ /^\./); return unless ($_ =~ /\.html/i); }, 'starting directory'); In this code, we use the function "return" (do nothing and, move on to the next ), and write that we do not use any file starting with a dot"." nor files other than html extension files. Return (unless those conditions are met) is equivalent to Return ( if those conditions are NOT met) $_ is the default variable : the current filename within the current directory =~ is the "mach" operator ^ this caret means "begins" \. leteral point i for caseinsensitive.

3. Testing the files

The variable $File::Find::name gives the full file name (path and the name of the file( while the name of the file is stored in the dfault variable $_. We select (test or check) the files. we use first the function "stat()", then some tests: stat $File::Find::name; return if -d; to checks if it is a directory return unless -r; to check if the file is readable

4. Searching the files

T know if a file contains the terms we are searching for, we open the file and put its contents into a string. open(FILE, "< $File::Find::name") or return; my $string = <FILE>; # This variable holds the contents of our file close (FILE); Next, lets check if the file contains our query, that is if $query is within $string: return unless ($string =~ /\Q$query\E/i);

5. Displaying the results

Let's replace the default variable $_ by a new variable $page. The condition we will set is to check the title of the file: my $page = $_; if ($string =~ /<title>(.*?)<\/title>/is) { $page = $1; } If the match occurs, the results will be contained in the variable $1 , and $page will be assigned its results. print "<li><a href=\"$File::Find::name\">$page</a></li>\n";
  
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