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<HTML><HEAD><TITLE>Recipe 20.5. Converting HTML to ASCII (Perl Cookbook)</TITLE><METANAME="DC.title"CONTENT="Perl Cookbook"><METANAME="DC.creator"CONTENT="Tom Christiansen & Nathan Torkington"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1999-07-02T01:45:57Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-243-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch20_01.htm"TITLE="20. Web Automation"><LINKREL="prev"HREF="ch20_05.htm"TITLE="20.4. Converting ASCII to HTML"><LINKREL="next"HREF="ch20_07.htm"TITLE="20.6. Extracting or Removing HTML Tags"></HEAD><BODYBGCOLOR="#FFFFFF"><img alt="Book Home" border="0" src="gifs/smbanner.gif" usemap="#banner-map" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Perl Cookbook"><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><p><TABLEWIDTH="684"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch20_05.htm"TITLE="20.4. Converting ASCII to HTML"><IMGSRC="../gifs/txtpreva.gif"ALT="Previous: 20.4. Converting ASCII to HTML"BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="228"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1"><ACLASS="chapter"REL="up"HREF="ch20_01.htm"TITLE="20. Web Automation"></A></FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch20_07.htm"TITLE="20.6. Extracting or Removing HTML Tags"><IMGSRC="../gifs/txtnexta.gif"ALT="Next: 20.6. Extracting or Removing HTML Tags"BORDER="0"></A></TD></TR></TABLE></DIV><DIVCLASS="sect1"><H2CLASS="sect1"><ACLASS="title"NAME="ch20-11848">20.5. Converting HTML to ASCII</A></H2><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch20-pgfId-535">Problem</A></H3><PCLASS="para">You want to convert an HTML file into formatted plain ASCII.</P></DIV><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch20-pgfId-541">Solution</A></H3><PCLASS="para">If you have an external formatter like lynx, call an external program:</P><PRECLASS="programlisting">$ascii = `lynx -dump $filename`;</PRE><PCLASS="para">If you want to do it within your program and don't care about the things that the HTML::TreeBuilder formatter doesn't yet handle (tables and frames):</P><PRECLASS="programlisting">use HTML::FormatText;use HTML::Parse;$html = parse_htmlfile($filename);$formatter = HTML::FormatText->new(leftmargin => 0, rightmargin => 50);$ascii = $formatter->format($html);</PRE></DIV><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch20-pgfId-563">Discussion</A></H3><PCLASS="para">These examples both assume you have the HTML text in a file. If your HTML is in a variable, you need to write it to a file for <ICLASS="filename">lynx</I> to read. If you are using <ACLASS="indexterm"NAME="ch20-idx-1000002634-0"></A><ACLASS="indexterm"NAME="ch20-idx-1000002634-1"></A>HTML::FormatText, use the HTML::TreeBuilder module:</P><PRECLASS="programlisting">use HTML::TreeBuilder;use HTML::FormatText;$html = HTML::TreeBuilder->new();$html->parse($document);$formatter = HTML::FormatText->new(leftmargin => 0, rightmargin => 50);$ascii = $formatter->format($html);</PRE><PCLASS="para">If you use Netscape, its "Save as" option with the type set to "Text" does the best job with tables.<ACLASS="indexterm"NAME="ch20-idx-1000002630-0"></A><ACLASS="indexterm"NAME="ch20-idx-1000002630-1"></A><ACLASS="indexterm"NAME="ch20-idx-1000002630-2"></A><ACLASS="indexterm"NAME="ch20-idx-1000002630-3"></A><ACLASS="indexterm"NAME="ch20-idx-1000002630-4"></A></P></DIV><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch20-pgfId-589">See Also</A></H3><PCLASS="para">The documentation for the CPAN modules HTML::Parse, HTML::TreeBuilder, and HTML::FormatText; your system's <ICLASS="filename">lynx </I>(1) manpage; <ACLASS="xref"HREF="ch20_07.htm"TITLE="Extracting or Removing HTML Tags">Recipe 20.6</A></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="684"TITLE="footer"><TABLEWIDTH="684"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch20_05.htm"TITLE="20.4. 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Extracting or Removing HTML Tags</TD></TR></TABLE><HRALIGN="LEFT"WIDTH="684"TITLE="footer"><FONTSIZE="-1"></DIV<!-- LIBRARY NAV BAR --> <img src="../gifs/smnavbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links"><p> <a href="copyrght.htm">Copyright © 2002</a> O'Reilly & Associates. All rights reserved.</font> </p> <map name="library-map"> <area shape="rect" coords="1,0,85,94" href="../index.htm"><area shape="rect" coords="86,1,178,103" href="../lwp/index.htm"><area shape="rect" coords="180,0,265,103" href="../lperl/index.htm"><area shape="rect" coords="267,0,353,105" href="../perlnut/index.htm"><area shape="rect" coords="354,1,446,115" href="../prog/index.htm"><area shape="rect" coords="448,0,526,132" href="../tk/index.htm"><area shape="rect" coords="528,1,615,119" href="../cookbook/index.htm"><area shape="rect" coords="617,0,690,135" href="../pxml/index.htm"></map> </BODY></HTML>⌨️ 快捷键说明
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