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@c Copyright (C) 1996, 1997 John W. Eaton
@c This is part of the Octave manual.
@c For copying conditions, see the file gpl.texi.
@node Grammar, Copying, Emacs, Top
@chapter Grammar
@cindex grammar rules
@cindex language definition
Someday I hope to expand this to include a semi-formal description of
Octave's language.
@menu
* Keywords::
@end menu
@node Keywords, , Grammar, Grammar
@section Keywords
@cindex keywords
The following identifiers are keywords, and may not be used as variable
or function names:
@example
@group
all_va_args endwhile
break for
case function
catch global
continue gplot
else gsplot
elseif if
end otherwise
end_try_catch return
end_unwind_protect switch
endfor try
endfunction unwind_protect
endif unwind_protect_cleanup
endswitch while
@end group
@end example
The following command-like functions are also speical. They may be used
as simple variable names, but not as formal parameters for functions, or
as the names of structure variables. Failed assignments leave them
undefined (you can recover the orginal definition as a function using
clear).
@example
@group
casesen echo load show
cd edit_history ls type
chdir format more which
clear help run_history who
diary history save whos
dir hold set
@end group
@end example
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