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2007-04-29 06:47:40 +00:00
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<TITLE>Documentation Strings</TITLE>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<UL>
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<LI><A NAME="tex2html697"
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HREF="node23.html#SECTION002310000000000000000">Doc</A>
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HREF="node23.html#SECTION002330000000000000000">DocVar</A>
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<HR>
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2007-04-29 06:47:40 +00:00
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<H1><A NAME="SECTION002300000000000000000">
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Documentation Strings</A>
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</H1>
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<P>
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It has been mentioned a few times already the importance of clearly
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documenting your files and library files. For the most part, you can
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use comments in your files; but in library files you use the
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D<SMALL>OC</SMALL> directive.
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<P>
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In addition to the commands listed in this chapter, you should also
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note <A HREF="node6.html#sec-grooves">D<SMALL>EF</SMALL>G<SMALL>ROOVES</SMALL></A>).
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<P>
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For some real-life examples of how to document your library files,
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look at any of the library files supplied with this distribution.
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<P>
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<H1><A NAME="SECTION002310000000000000000"></A> <A NAME="sec-docs"></A>
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<BR>
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Doc
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</H1>
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<P>
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A D<SMALL>OC</SMALL> command is pretty simple:
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<P>
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<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
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<tr><td>
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<B>Doc This is a documentation string! </B>
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</td></tr>
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</Table>
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<P>
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In most cases, D<SMALL>OC</SMALL>s are treated as C<SMALL>OMMENT</SMALL>s. However,
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if the <I>-Dx</I><A NAME="tex2html68"
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HREF="#foot10621"><SUP>23.1</SUP></A> option is given
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on the command line, D<SMALL>OC</SMALL>s are processed and printed to standard
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output.
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<P>
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For producing the <I>
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> Standard Library Reference</I> a trivial
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Python program is used to collate the output generated with a command
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like:
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<P>
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<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
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<tr><td>
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<B>$ mma -Dxl -w /usr/local/lib/mma/swing </B>
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</td></tr>
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</Table>
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<P>
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Note, the '-w' option has been used to suppress the printing of warning
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messages.
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<P>
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<H1><A NAME="SECTION002320000000000000000">
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Author</A>
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</H1>
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<P>
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As part of the documentation package, there is a A<SMALL>UTHOR</SMALL>
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command:
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<P>
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<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
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<tr><td>
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<B>Author Bob van der Poel </B>
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</td></tr>
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</Table>
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<P>
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Currently A<SMALL>UTHOR</SMALL> lines are processed and the data is saved, but
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never used. It may be used in a future library documentation
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procedures, so you should use it in any library files you write.
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<P>
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2007-04-29 06:47:40 +00:00
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<H1><A NAME="SECTION002330000000000000000">
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DocVar</A>
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</H1>
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<P>
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If any variables are used to change the behavior of a library file
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they should be documented with a D<SMALL>OC</SMALL>V<SMALL>AR</SMALL> command. Normally these
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lines are treated as comments, but when processing with the -Dxl or
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-Dxh command line options the data is parsed and written to the output
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documentation files.
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<P>
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Assuming that you are using the
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<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> variable $C<SMALL>HORD</SMALL>V<SMALL>OICE</SMALL> as
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an optional voice setting in your file, you might have the following
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in a library file:
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<P>
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2007-04-29 06:47:40 +00:00
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<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
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<tr><td>
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<B>Begin DocVar
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<BR>
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ChordVoice Voice used in Chord tracks (defaults to Piano2).
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<BR>
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End
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<BR>
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<BR>
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If NDef ChordVoice
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<BR>
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Set ChordVoice Piano2
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<BR>
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Endif </B>
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</td></tr>
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</Table>
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<P>
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All variables used in the library file should be documented. You
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should list the user variables first, and then any variables internal
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to the library file. To double check to see what variables are used
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you can add a S<SMALL>HOW</SMALL>V<SMALL>ARS</SMALL> to the end of the library file and
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compile. Then document the variables and remove the S<SMALL>HOW</SMALL>V<SMALL>ARS</SMALL>.
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<P>
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<BR><HR><H4>Footnotes</H4>
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<DL>
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<DT><A NAME="foot10621">...-Dx</A><A
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HREF="node23.html#tex2html68"><SUP>23.1</SUP></A></DT>
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<DD>See the <A HREF="node2.html#cmd-summary">command
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summary</A>.
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</DD>
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</DL><HR>
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<ADDRESS>
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bob
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2007-03-07
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