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<HTML><HEAD><TITLE>1.2 Parsing Conventions</TITLE><LINK href="ozdoc.css" rel="stylesheet" type="text/css"></HEAD><BODY><TABLE align="center" border="0" cellpadding="6" cellspacing="6" class="nav"><TR bgcolor="#DDDDDD"><TD><A href="node2.html#section.application.module"><< Prev</A></TD><TD><A href="node1.html">- Up -</A></TD><TD><A href="node4.html#section.application.specifications">Next >></A></TD></TR></TABLE><DIV id="section.application.parsingconventions"><H2><A name="section.application.parsingconventions">1.2 Parsing Conventions</A></H2><P> This section describes how the arguments are acquired and what basic syntax is used for parsing them. </P><H3><A name="label16">1.2.1 Parsing of CGI Arguments</A></H3><P> The CGI always passes arguments as name/value pairs, where the name is separated from the value by an equals sign and the individual pairs are separated by ampersands. </P><P> Boolean options <I>option</I> may be given as <I>option</I><CODE>=yes</CODE> or <I>option</I><CODE>=no</CODE>. Option names may be abbreviated, as long as they remain unambiguous. </P><DIV id="section.application.cmdparsing"><H3><A name="section.application.cmdparsing">1.2.2 Parsing of Command Lines</A></H3><P> We distinguish between long option names and single character options. Long options are given as <CODE>--</CODE><I>option</I> or <CODE>--</CODE><I>option</I><CODE>=</CODE><I>value</I>; option names may be abbreviated as long as they remain unambiguous. Single-character options are given as <CODE>-</CODE><I>x</I>, eventually followed by a value. Several single-character options may be combined, e. g., <CODE>-xy</CODE> means <CODE>-x -y</CODE> (provided <CODE>x</CODE> does not take an argument). The argument to a single-character option may be attached to the option character, i. e., you can write <CODE>-</CODE><I>x</I><I>value</I> or <CODE>-</CODE><I>x</I><CODE> </CODE><I>value</I>. </P><P> Boolean options <I>option</I> may be given as <CODE>--</CODE><I>option</I> (meaning <CODE><SPAN class="keyword">true</SPAN></CODE>) or <CODE>--no</CODE><I>option</I> (meaning <CODE><SPAN class="keyword">false</SPAN></CODE>). A single hyphen <CODE>-</CODE> by itself is not considered to be an option and thus is returned unchanged. Parsing stops at a double hyphen <CODE>--</CODE> appearing by itself; the double hyphen itself does not appear in the output. </P><P> In the case of an unrecognized long option name or single-character option, or of an ambiguous long option prefix, an error is raised. </P></DIV></DIV><TABLE align="center" border="0" cellpadding="6" cellspacing="6" class="nav"><TR bgcolor="#DDDDDD"><TD><A href="node2.html#section.application.module"><< Prev</A></TD><TD><A href="node1.html">- Up -</A></TD><TD><A href="node4.html#section.application.specifications">Next >></A></TD></TR></TABLE><HR><ADDRESS><A href="http://www.ps.uni-sb.de/~duchier/">Denys Duchier</A>, <A href="http://www.ps.uni-sb.de/~kornstae/">Leif Kornstaedt</A>, <A href="http://www.ps.uni-sb.de/~homik/">Martin Homik</A>, <A href="http://www.ps.uni-sb.de/~tmueller/">Tobias Müller</A>, <A href="http://www.ps.uni-sb.de/~schulte/">Christian Schulte</A> and <A href="http://www.info.ucl.ac.be/~pvr">Peter Van Roy</A><BR><SPAN class="version">Version 1.4.0 (20110908185330)</SPAN></ADDRESS></BODY></HTML>
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