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authorEd Schouten <ed@FreeBSD.org>2011-04-30 10:55:14 +0000
committerEd Schouten <ed@FreeBSD.org>2011-04-30 10:55:14 +0000
commit0294a182a1629b1d854b84906e73487d6cb75fba (patch)
treee563e21bcc0164ba11452983316bda26eebb1d3c /doc/html/Ada95.html
parent22b11c4db16996bf8d4878fab98762c348676df3 (diff)
downloadsrc-0294a182a1629b1d854b84906e73487d6cb75fba.tar.gz
src-0294a182a1629b1d854b84906e73487d6cb75fba.zip
Import a stock copy of ncurses 5.8 into the vendor space.vendor/ncurses/5.8-20110226
It seems both local changes we made to 5.7 have already been fixed upstream properly, so there is no need to preserve the changes. Also, with SVN we import full source trees. Unlike CVS, where we removed unneeded cruft.
Notes
Notes: svn path=/vendor/ncurses/dist/; revision=221243 svn path=/vendor/ncurses/5.8-20110226/; revision=221244; tag=vendor/ncurses/5.8-20110226
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+<HTML>
+<HEAD>
+<TITLE>Ada95 Binding for ncurses</Title>
+<link rev=made href="mailto:bug-ncurses@gnu.org">
+<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+</HEAD>
+<BODY>
+<H1>Ada95 Binding for ncurses</H1>
+by J&uuml;rgen Pfeifer.
+
+<HR SIZE=3 NOSHADE>
+<H2>General Remarks</H2>
+<UL>
+<LI>This document describes Version 01.00 of the binding.</LI>
+<LI>The functionality is modeled to be compatible with the ncurses
+package, a clone of the SVr4 curses model.<BR>
+I did the development on an Intel box running the latest stable release of
+<A HREF="http://www.linux.org">Linux</A>, ncurses and the most recent released
+<A HREF="http://www.gnat.com">GNU Ada Translator</A>
+gnat versions. For any older versions of ncurses and gnat
+it is not guaranteed to work.</LI>
+<LI>You must have the m4 macroprocessor to build this package.
+If you don't have this program, you can get the FSF version
+<A HREF="ftp://ftp.gnu.org/pub/gnu/">here</A>.</LI>
+<LI>Ada programs are supposed to be readable. One of my
+favorite methods to make code readable is to use expressive
+names for the identifiers. You can find a list of a mapping
+of the cryptic curses names to the Ada names in this <A HREF="ada/table.html">table</A>.</LI>
+<LI>This is not a typical one-to-one interface mapping. It is
+close to one-to-one on the functional level. Each (n)curses function
+has it's counterpart with a more or less similar formal parameter list
+in the binding. It is not one-to-one with respect to the datatypes.
+I tried to make records out of the flat chtype and similar structures,
+so you don't have to do bit operations to mark an attributed character
+as bold. Just make the boolean member <STRONG>bold</STRONG> of the record
+true. The binding also hides the structures like WINDOW, PANEL, MENU, FORM
+etc. ! It's a pure functional API.</LI>
+<LI>I try to do as much error checking as possible and feasible
+in the binding. I will raise an Ada exception when something
+went wrong in the low-level curses. This has the effect that - at least
+first time in my life - (n)curses programs have now a very rigid error
+checking, but - thanks to Ada - you don't have to code the orgiastic
+error checking style of C.</LI>
+<LI>Support for wide characters is currently not in the binding, as it
+is not really in ncurses at this point in time.</LI>
+</UL>
+
+<H2>Limitations</H2>
+<UL>
+<LI>I provide no SCREEN datatype and functions to set a new screen.
+If you need this (mostly for debugging I guess), write a small
+C routine doing all this and import it into your Ada program.</LI>
+<LI>I provide no functions to switch on/off curses tracing options.
+Same suggestion as above.</LI>
+<LI>Although Ada95 is an OO Language, this binding doesn't provide
+an OO abstraction of the (n)curses functionality. As mentioned above
+it's a thin binding for the (n)curses functions. But without any
+doubt it would be nice to build on top of this an OO abstraction
+of (n)curses functionality.<BR>
+The only exception is the method how fieldtypes are represented in
+this Binding. We provide an abstract tagged type Field_Type from
+which the various fieldtypes are derived.</LI>
+<LI>I currently do not support the link_fieldtype functionality of the
+forms subsystem.</LI>
+<LI>The *_IO packages are currently output only.</LI>
+</UL>
+
+<H2>Hierarchy of packages</H2>
+<UL>
+<LI><A HREF="ada/terminal_interface__ads.htm">Terminal_Interface</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses__ads.htm">Curses</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-mouse__ads.htm">Mouse</A>
+ <LI><A HREF="ada/terminal_interface-curses-panels__ads.htm">Panels</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-panels-user_data__ads.htm">User_Data</A>
+ </UL>
+ <LI><A HREF="ada/terminal_interface-curses-menus__ads.htm">Menus</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-menus-menu_user_data__ads.htm">Menu_User_Data</A>
+ <LI><A HREF="ada/terminal_interface-curses-menus-item_user_data__ads.htm">Item_User_Data</A>
+ </UL>
+ <LI><A HREF="ada/terminal_interface-curses-forms__ads.htm">Forms</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-forms-form_user_data__ads.htm">Form_User_Data</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_user_data__ads.htm">Field_User_Data</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types__ads.htm">Field_Types</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-forms-field_types-alpha__ads.htm">Alpha</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types-alphanumeric__ads.htm">AlphaNumeric</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types-intfield__ads.htm">IntField</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types-numeric__ads.htm">Numeric</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types-regexp__ads.htm">RegExp</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types-ipv4_address__ads.htm">IPV4_Address</A>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types-enumeration__ads.htm">Enumeration</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-forms-field_types-enumeration-ada__ads.htm">Ada</A>
+ </UL>
+ <LI><A HREF="ada/terminal_interface-curses-forms-field_types-user__ads.htm">User</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-forms-field_types-user-choice__ads.htm">Choice</A>
+ </UL>
+ </UL>
+ </UL>
+ <LI><A HREF="ada/terminal_interface-curses-text_io__ads.htm">Text_IO</A>
+ <UL><LI><A HREF="ada/terminal_interface-curses-text_io-integer_io__ads.htm">Integer_IO</A>
+ <LI><A HREF="ada/terminal_interface-curses-text_io-float_io__ads.htm">Float_IO</A>
+ <LI><A HREF="ada/terminal_interface-curses-text_io-fixed_io__ads.htm">Fixed_IO</A>
+ <LI><A HREF="ada/terminal_interface-curses-text_io-decimal_io__ads.htm">Decimal_IO</A>
+ <LI><A HREF="ada/terminal_interface-curses-text_io-modular_io__ads.htm">Modular_IO</A>
+ <LI><A HREF="ada/terminal_interface-curses-text_io-enumeration_io__ads.htm">Enumeration_IO</A>
+ <LI><A HREF="ada/terminal_interface-curses-text_io-complex_io__ads.htm">Complex_IO</A>
+ </UL>
+ </UL>
+ </UL>
+</UL>
+If you want to navigate through the html pages of the package specs, click <A HREF="ada/index.htm">here</A>.
+<H2>Implementation Details</H2>
+<H4>Behind the abstraction</H4>
+All the new types like <STRONG>Window</STRONG>, <STRONG>Panel</STRONG>,
+<STRONG>Menu</STRONG>, <STRONG>Form</STRONG> etc. are just
+opaque representations of the pointers to the corresponding
+low level (n)curses structures like
+<STRONG>WINDOW *</STRONG>, <STRONG>PANEL *</STRONG>,
+<STRONG>MENU *</STRONG> or <STRONG>FORM *</STRONG>.
+So you can safely pass them to C routines that expect a pointer
+to one of those structures.
+<H4>Extended ripoffline() usage</H4>
+The official documentation of (n)curses says, that the line parameter
+determines only whether or not exactly <STRONG>one</STRONG> line is
+stolen from the top or bottom of the screen. So essentially only the
+sign of the parameter is evaluated. ncurses has internally implemented
+it in a way, that uses the line parameter also to control the amount of
+lines to steal. This mechanism is used in the <STRONG>Rip_Off_Lines</STRONG>
+routine of the binding.
+<H4><A NAME="userpointer">How user defined field types work</A></H4>
+TBD
+<H4>Enumeration fields handling</H4>
+The (n)curses documentation says, that the String arrays to be passed to
+an TYPE_ENUM fieldtype must not be automatic variables. This is not true
+in this binding, because it is internally arranged to safely copy these
+values.
+<H4><A NAME="compiler">Using other Ada compilers</A></H4>
+This should basically not be a problem.
+<H4>Port to other curses implementations</H4>
+Basically it should not be too hard to make all this run on a regular SVr4
+implementation of curses. The problems are probably these:<BR>
+<UL>
+<LI>ncurses has some additional features which are presented in this binding. You
+have two choices to deal with this:
+<UL>
+<LI>Emulate the feature in this binding</LI>
+<LI>Raise an exception for non implemented features</LI>
+</UL>
+Most likely you will follow a mixed approach. Some features are easy to simulate,
+others will be hard if not impossible.</LI>
+</UL>
+I'm quite sure I forgot something.
+</BODY>
+</HTML>