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FUNNELWEB MANUAL WEB PAGE
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Copyright (c) Ross N. Williams 1992,1999. All rights reserved.
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Permission is granted to redistribute and use this manual in
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and all legal notices) are preserved on all copies, that all
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modifications since the manual's original release by Ross N.
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Williams (www.ross.net) consist of translations or other
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transformations that alter only the manual's form, not its
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content. THIS MANUAL IS PROVIDED "AS IS" AND WITHOUT ANY
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LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND
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FITNESS FOR A PARTICULAR PURPOSE. TO THE EXTENT PERMITTED BY
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<TITLE>2.2 Command Line Arguments</TITLE>
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<A HREF="index.html"><FONT COLOR="#FFFFFF"><B>Reference</B></FONT></A><BR>
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<A HREF="intro.html"><FONT COLOR="#FFFFFF">1 Introduction</FONT></A><BR>
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<A HREF="interface.html"><FONT COLOR="#FFFFFF">2 Interface</FONT></A><BR>
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<P><FONT SIZE="5">2.2 Command Line Arguments</FONT><BR>
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<P>Following the verb is the body of the command line
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which FunnelWeb parses into zero or more
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<STRONG>arguments</STRONG> separated by runs of one or more
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FunnelWeb_command_line =
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FunnelWeb_verb { {" "}+ argument }
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<P>Because some operating systems convert their command
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line to upper case before handing it to the invoked program,
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FunnelWeb has been constructed so as to be
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<I>insensitive</I> to the case of its command line
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arguments. However, when dealing
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internally with arguments, FunnelWeb <I>preserves</I> the
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case of its command line arguments so that it will be able
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to operate with operating systems (such as
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Unix) whose file names are case dependent.
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<P>A valid FunnelWeb argument consists of a
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<STRONG>sign</STRONG>, an identifying <STRONG>letter</STRONG>,
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and an optional <STRONG>string</STRONG> with no spaces
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argument = sign id_letter [non_blank_string]
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sign = "+" | "-" | "="
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id_letter = "B" | "C" | "D" | "F" | "H" | "I" |
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"J" | "K" | "L" | "O" | "Q" | "S" |
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<P>In addition there is a special form of argument that
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does not begin with a sign.
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argument = non_blank_string_not_starting_with_+_=_or_-
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<P>This form is exactly equivalent to the same string with
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"<TT>+F</TT>" prepended to it.
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<P>The semantic effect of these arguments is defined in
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terms of <STRONG>options</STRONG> which are the internal
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parameters of FunnelWeb and which correspond closely with
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the set of legal command line arguments. FunnelWeb has a
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predefined set of options each identified by an identifying
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letter having two attributes: a <I>string</I> , and a
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<I>boolean</I> . The boolean determines whether an option
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is turned <I>on</I> or <I>off</I> . The string contains
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additional information depending on the option.
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<P>When FunnelWeb starts up, its options have predefined
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default values. FunnelWeb then parses its command line
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sequentially from left to right executing the effect of each
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argument on the argument's corresponding option. The sign
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and the string components of the argument are processed
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<I>independently</I> . A sign of <SAMP>+</SAMP> turns the
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option on. A sign of <SAMP>-</SAMP> turns the option off. A
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sign of <SAMP>=</SAMP> leaves the option's boolean attribute
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unchanged. The argument string replaces the string of the
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corresponding option, unless the argument string is empty,
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in which case the option string is not changed.
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<P>Because FunnelWeb processes its command line arguments
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from left to right, a later argument can cancel the effect
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of an earlier one. For example <SAMP>fw +t -t</SAMP> will
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result in the <SAMP>t</SAMP> option ending up <I>off</I> .
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This allows users to set up their own default arguments by
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defining a symbol in their operating system's command
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language. For example, a Unix user who wants FunnelWeb to
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delete all identical output files and create a documentation
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file on each run with a default <SAMP>.typ</SAMP> extension
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could simply place the following definition in their
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"<TT>.login</TT>" file.
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alias fw fw +d +t.typ
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<P>These default options can then later be easily
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overridden on the command line.
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<A HREF="copyright.html">Copyright © Ross N. Williams 1992,1999. All rights reserved.</A><BR>
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