WWW(3)
NAME
WWW - World Wide Web Package
SYNOPSIS
extract_description( FILE ) extract_meta( FILE, NAME ) hyperlink( LIST )
DESCRIPTION
This package provides a utility functions for the World Wide Web to extract descriptions of or meta information from files, and hyperlink text.
SUBROUTINES
The following Perl subroutines are defined and available:
extract_description( FILE )
Extracts a description from an HTML or plain text file given by
the FILE name; FILE should be an absolute path. The first
$description::chars (default: 2048) characters are read. If the
file ends in one of the extensions htm, html, or shtml, it is
presumed to be an HTML file; if the file ends in txt, it is
presumed to be a plain text file. Other extensions are not
recognized and no description is returned for them.
For HTML files, first, if a <META NAME="description"
CONTENT="..."> or a <META NAME="DC.description" CONTENT="...">
(Dublin Core) element is found, then the words specified as the
value of the CONTENT attribute is returned as the description.
Otherwise, all HTML comments, text between <SCRIPT>, <STYLE>,
and <TITLE> tags, and all other HTML tags are stripped. If
<AREA ... ALT="..."> or <IMG ... ALT="..."> elements are found,
then the words specified as the value of the ALT attributes are
extracted.
Finally, for either HTML or plain text files, at most
$description::words (default: 50) are returned.
extract_meta( FILE, NAME )
Extracts the value of the CONTENT attribute from a META element
having the given NAME attribute from an HTML file given by the
FILE name; FILE should be an absolute path. The file must end
in one of the extensions htm, html, or shtml to be considered an
HTML file. The first $description::chars (default: 2048)
characters are read. The characters are cached between
consecutive calls using the same filename.
hyperlink( LIST )
Adds hyperlinks to strings: that is strings that contain
substrings that are valid URLs (according to RFC 1630) have the
appropriate HTML tags ``wrapped'' around them so that they will
be selectable when displayed in a browser. The ftp, gopher,
http, https, mailto, news, telnet, and wais URLs are recognized.
Example:
Read all about it at
http://www.usatoday.com/
becomes:
Read all about it at
<A HREF="http://www.usatoday.com/">http://www.usatoday.com/</A>
SEE ALSO
perl(1) Tim Berners-Lee. ``Universal Resource Identifiers in WWW,'' Request for Comments 1630, Network Working Group of the Internet Engineering Task Force, June 1994. Tim Berners-Lee, Larry Masinter, and Mark McCahill. ``Uniform Resource Locators (URL),'' Request for Comments 1738, Network Working Group, 1994. Dave Raggett, Arnaud Le Hors, and Ian Jacobs. ``Notes on helping search engines index your Web site,'' HTML 4.0 Specification, Appendix B: Performance, Implementation, and Design Notes, World Wide Web Consortium, April 1998. --. ``Objects, Images, and Applets: How to specify alternate text,'' HTML 4.0 Specification, 13.8, World Wide Web Consortium, April 1998. Dublin Core Directorate. ``The Dublin Core: A Simple Content Description Model for Electronic Resources.'' Larry Wall, et al. Programming Perl, 3rd ed., O'Reilly & Associates, Inc., Sebastopol, CA, 2000.
AUTHOR
Paul J. Lucas <pauljlucas@mac.com> WWW February 12, 2000 WWW(3)
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