HTML::TagReader --------------- Summary: TagReader is a perl extension module which allows you to read html/xml files by tag. That is: in a similar way as you can read textfiles by line with "while(<>)" you use TagReader::getbytoken to read a file by tag. You find a complete description of HTML::TagReader further down. Installation: To install run: perl Makefile.PL make make test make install Note: the application tr_imgaddsize needs Image::Size but you can install HTML::TagReader without having this module if you don't need tr_imgaddsize. You can test if Image::Size is installed on your computer by running perl -e 'use Image::Size' This command will print nothing if it is installed. tr_httpcheck has a dependency on curl but this is also not enforced during installation. You can check what the version of a possibly already installed HTML::TagReader is by running the command: perl -e 'use HTML::TagReader;print $HTML::TagReader::VERSION."\n"' ------------------- ------------------- ------------------- Non-standard Installation: If you want to install TagReader and the application programs below /usr/local (/usr/local/bin , /usr/local/lib/5.6.0/i386-linux /usr/local/lib/site_perl/5.6.0/i386-linux/auto/HTML/TagReader etc...) then run perl Makefile.PL PREFIX=/usr/local make make test make install To install only the perl module in a different location (but e.g. the man pages in the standard location) use: perl Makefile.PL LIB=/you/new/libpath make test make install ------------------- ------------------- ------------------- The subdirectory bin contains some applications of TagReader. All of them start with the prefix "tr_" tr_blck -- check for broken relative links in html pages tr_llnk -- list links in html files tr_xlnk -- expand links on directories tr_mvlnk -- modify tags in html files with perl commands. tr_staticssi -- expand SSI directives #include virtual and #exec cmd tr_delfont -- delete font tags that hardcode the size or font face tr_delfont -- delete font tags that hardcode the size or font face tr_httpcheck -- check if a particular web-pages exists httpcheck does not directyl use the TagReader module but may be used as post processor for blck If you are interessted in a link checker to check links only via the web-server then this is not the right program for you. Other programs like e.g http://linkchecker.sourceforge.net/ or http://www.linklint.org/ or http://linkchecker.stacken.kth.se/ (webpage where you can enter a url to check) or http://htcheck.sourceforge.net/ or http://www.jmarshall.com/tools/cl/ can be used if you want to check your web-pages only remotely via a web server. tr_tagcontentgrep -- grep for a tag e.g "img src" tr_imgaddsize -- add width and height to

(needs Image::Size from http://www.cpan.org/authors/id/R/RJ/RJRAY/ ) Note the primary desing goal of TagReader is to provide a fast way of reading/processing html files. These application programs will normally be installed to /usr/bin/ ------------------- ------------------- ------------------- Author: guidosocher(at)fastmail.com Homepage: http://linuxfocus.org/~guido/ Homepage on CPAN: http://cpan.org/authors/id/G/GU/GUS/ Copyright: This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Installation requirements: Perl and a c-compiler (e.g gcc) Needs Image::Size if you want to use tr_imgaddsize ------------------- ------------------- ------------------- NAME TagReader - Perl extension module for reading html/sgml/xml files by tags. SYNOPSIS use HTML::TagReader; # open then file and get an obj-ref: my $p=new HTML::TagReader "filename"; # set to zero or undef to omit warnings about html error: $showerr=1; # get only the tags: my $tag = $p->gettag($showerr); # or my ($tag,$linenumber,$column)=$p->gettag($showerr); # get the entire file split into tags and text parts: my $tagOrText = $p->getbytoken($showerr); # or my ($tagOrText,$tagtype,$linenumber,$column)=$p->getbytoken($showerr); DESCRIPTION The module implements a fast and small object oriented way of processing any kind of html/sgml/xml files by tag. The getbytoken(0) is similar to while(<>) but instead of reading lines it reads tags or tags and text. HTML::TagReader makes it easy to keep track of the line number in a file even though you are not reading the file by line. This important if you want to implement error messages about html error in your code. Here is a program that list all href tags in a html file together with line numbers and column: use HTML::TagReader; my $p=new HTML::TagReader "file.html"; my @tag; while(@tag = $p->gettag(1)){ if ($tag[0]=~/ href ?=/i){ # remove optional space before the equal sign: $tag[0]=~s/ ?= ?/=/g; print "line: $tag[1]: col: $tag[2]: $tag[0]\n"; } } Here is a program that will read a html file tag wise: use HTML::TagReader; my $p=new HTML::TagReader "file.html"; my @tag; while(@tag = $p->getbytoken(1)){ if ($tag[1] eq ""){ print "line: $tag[2]: not a tag (some text), \"$tag[0]\"\n\n"; }else{ print "line: $tag[2]: col: $tag[2]: is a tag, $tag[0]\n\n"; } } new HTML::TagReader $file; Returns a reference to a TagReader object. This reference can be used with gettag() or getbytoken() to read the next tag. gettag($showerr); Returns in an array context tag, line number and character in the line (column). In a scalar context just the next tag is returned. An empty string or and empty array is returned if the file contains no further tags. html/xml comments and any tags inside the comments are ignored. The returned tag string has all white space (tab, newline...) reduced to just a single space otherwise upper and lower case, quotes etc are as in the original file. The line numbers are those where the tag starts. You must provide 0 (or undef) or 1 as an argument to gettag. If 0 is provided then gettag will not print any errors if it finds a syntax error in the html/sgml/xml code. Currently only the following warning messages are implemented to warn about possible html syntax errors: - A starting '<' was found but no closing '>' after 300 characters - A single '<' was found which was not followed by [!/a-zA-Z]. Such a '<' should be written as < - A single '>' was found outside a tag. getbytoken($showerr); Returns in an array context tag, tagtype (a, br, img,...), line number and the character position (column) in the line where the tag starts. In a scalar context just the next tag is returned. An empty string or and empty array is returned if the file contains no further tags. getbytoken() should be used to process a html file and possibly modify tags. As opposed to gettag() the getbytoken() does not remove newline or space from the data. getbytoken() gives you access to the entire file and not only to the tags. That is: you can process the tags and the text between the tags. tagtype is always lower case. The tagtype is the string starting the tag such as "a" in or "!--" in . tagtype is empty if this is not a tag (normal text or newline). You must provide 0 (or undef) or 1 as an argument to getbytoken. If 0 is provided then gettag will not print any errors if it finds a syntax error in the html/sgml/xml code. Currently only the following warning messages are implemented to warn about possible html syntax errors: - A starting '<' was found but no closing '>' after 300 characters - A single '<' was found which was not followed by [!/a-zA-Z]. Such a '<' should be written as < - A single '>' was found outside a tag. Working without HTML::TagReader In special cases it is possible to do processing of files by tag in an efficient way without the HTML::TagReader package. This can be done by setting the record separator variable in perl ($/). This causes however problems with faulty html code where individual '<'-characters appear in the middle of the text. An example of such a program written in plain perl (without HTML::TagReader) is the tr_tagcontentgrep program which is part of the HTML::TagReader distribution. Think first then write your code! (HTML::TagReader is in most cases the best choice, not in all ;-) Limitations There are no limitation to the size of the file. If you need a more sophisticated interface you might want to take a look at HTML::Parser. HTML:TagReader is fast generic and straight forward to use. COPYRIGHT Copyright (c) Guido Socher This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO homepage of this program: http://linuxfocus.org/~guido/ or http://cpan.org/authors/id/G/GU/GUS/ perl(1) HTML::Parser(3)