Vanquish has asked for the wisdom of the Perl Monks concerning the following question:

Hi I am trying to print out plain text from the tag (TD) and i also want to add attributes. Help needed Thanks MQ 
#!/usr/bin/perl
use strict;
use warnings;
use LWP::UserAgent;
use HTML::Parser;

# Create instance
my $p = HTML::Parser->new(api_version => 3,
                          marked_sections    => 1,
                          unbroken_text      => 1,
                start_h => [\&start_rtn, 'tag','event'],
                text_h => [\&text_rtn, 'text'],
                end_h => [\&end_rtn, 'tag']);
# Start parsing the following HTML file
$p->parse_file("testpage.html");

sub start{
# Execute when start tag is encountered
      my ($tag, $text, $event) = @_;
       if ($tag =~ /td/){
       print "\t$text \n";
}
}

[download]

Replies are listed 'Best First'.
Re: HTML Parser print text
by Joost (Canon) on Jul 07, 2004 at 21:01 UTC
    Ok, so based on your replies above, given: 
    <HTML>
<title>My Page</title>
</head>
<body>
<center>
<h1>Brand.com Production Instances</h1>
<br>
<table border=1>

<tr><td></td><td><b>&nbsp;Service &nbsp;&nbsp;</b></td><td><b>Instance
+&nbsp;</b></td>
<tr><td align="right">1</td><td>&nbsp;app2<br></td><td>&nbsp;prd-1</td
+><td>
</td>
</tr>
<tr><td align="right">2</td><td>&nbsp;app2 &nbsp;<br></td><td>&nbsp;pr
+d-2</td><td>
</td></tr>
<tr><td align="right">3</td><td>&nbsp;app3<br></td><td>&nbsp;prd-1</td
+><td>

    [download]
    etc etc

    you want to print out the text in the <td> tags that have align="right" as an attribute.

    This code will do that: 

    #!/usr/bin/perl
use strict;
use warnings;
use LWP::UserAgent;
use HTML::Parser;

# Create instance
my $p = HTML::Parser->new(api_version => 3,
        marked_sections    => 1,
        unbroken_text      => 1,
        start_h => [\&start, "tagname, attr"],
        text_h => [\&text, 'text'],
);
# Start parsing the following HTML file
$p->parse_file("testpage.html");

my $get_next_text = 0;
sub start{
# Execute when start tag is encountered
    my ($tagname,$attr) = @_;
    if ($tagname eq 'td' && exists $attr->{align} && $attr->{align} eq
+ 'right'){
        $get_next_text = 1;
    }
    else {
        $get_next_text = 0;
    }
}
sub text {
    my $text = shift;
    print "$text\n" if $get_next_text;
}

    [download]

    What it does is this:

    1. Set up HTML::Parser so that for each start tag &start gets called with as arguments the tag name ("td" or something else) followed by the attributes as a hash-ref) and that for all text parts &text gets called with the text as the argument.

      Note that a start tag is ANY tag that doesn't begin with </ - so <p> is a start tag and <td> is a start tag, but </p> is not. A "text" part is anything that is not a tag.

    2. Test in &start if the current tag is a <td> with an align="right" attribute. If yes: set $get_next_text to true. if no: set $get_next_text to false.

    3. Test in &text if the previous tag was a <td align="right"> (via the $get_next_text variable). If yes, print, otherwise do nothing.
    Hope this clears it up :-)

    Joost.

    "What should it profit a man, if he should win a flame war, yet lose his cool?"
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      Great Works
      Thanks Alot
      Have a nice Day
      MQ
[reply]
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Re: HTML Parser print text
by Joost (Canon) on Jul 07, 2004 at 18:14 UTC
[reply]
      Thanks for reply I need plain text embeded in tags with attriutes. My code wont print any output. testpage.html is nothing but simple hello world page. Thanks again
[reply]
        testpage.html CAN'T be a simple "Hello World" page, because, for my definition of simple, that would look like: 
        <html>
<head>
<title>Some title</title>
</head>
<body>
Hello, World
</body>
</html>

        [download]
        And would not contain any <td> tags. Besides, I still don't know WHAT the tags are that you want around it (or do you want the plain text in an attribute? I've no clue)

        So please:

        Show the input file. Completely.

        Show the code. Completely.

        Show your intended output. Completely. And tell us a bit about why it should be exactly that output.

        "What should it profit a man, if he should win a flame war, yet lose his cool?"
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