Initial import of Dillo

devdoc/NC_design.txt

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+
+     _________________________________________________________________
+
+                             Naming&Coding design
+     _________________________________________________________________
+
+   Dillo's code is divided into modules. For instance: bookmark, cache,
+   dicache, gif.
+
+   Let's think of a module named "menu", then:
+     * Every internal routine of the module, should start with "Menu_"
+       prefix.
+     * "Menu_" prefixed functions are not meant to be called from outside
+       the module.
+     * If the function is to be exported to other modules (i.e. it will
+       be called from the outside), it should be wrapped with an "a_"
+       prefix.
+
+   For instance: if the function name is "Menu_create", then it's an
+   internal function, but if we need to call it from the outside, then it
+   should be renamed to "a_Menu_create".
+
+   Why the "a_" prefix?
+   Because of historical reasons.
+   And "a_Menu_create" reads better than "d_Menu_create" because the
+   first one suggests "a Menu create" function!
+
+   Another way of understanding this is thinking of "a_" prefixed
+   functions as Dillo's internal library, and the rest ("Menu_" prefixed
+   in our example) as a private module-library.
+
+   Indentation:
+
+   Source code must be indented with 3 blank spaces, no Tabs.
+   Why?
+   Because different editors expand or treat tabs in several ways; 8
+   spaces being the most common, but that makes code really wide and
+   we'll try to keep it within the 80 columns bounds (printer friendly).
+
+   You can use:   indent -kr -sc -i3 -bad -nbbo -nut -l79 myfile.c
+
+   Function commenting:
+
+   Every single function of the module should start with a short comment
+   that explains its purpose; three lines must be enough, but if you
+   think it requires more, enlarge it.
+
+   /*
+    * Try finding the url in the cache. If it hits, send the contents
+    * to the caller. If it misses, set up a new connection.
+    */
+   int a_Cache_open_url(const char *url, void *Data)
+   {
+      ...
+      ...
+      ...
+   }
+
+   We also have the BUG:, TODO:, and WORKAROUND: tags.
+   Use them within source code comments to spot hidden issues. For
+   instance:
+
+   /* BUG: this counter is not accurate */
+   ++i;
+
+   /* TODO: get color from the right place */
+   a = color;
+
+   /* WORKAROUND: the canonical way of doing it doesn't work yet. */
+   ++a; ++a; ++a;
+
+   Function length:
+
+   Let's try to keep functions within the 45 lines boundary. This eases
+   code reading, following, understanding and maintenance.
+
+   Functions with a single exit:
+
+   It's much easier to follow and maintain functions with a single exit
+   point at the bottom (instead of multiple returns). The exception to
+   the rule are calls like dReturn_if_fail() at its head.
+
+   dlib functions:
+
+     * Dillo uses dlib extensively in its C sources. Before starting
+       to code something new, a good starting point is to check what
+       this library has to offer (check dlib/dlib.h).
+     * Memory management must be done using dNew, dNew0, dMalloc, dFree
+       and their relatives.
+     * For debugging purposes and error catching (not for normal flow):
+       dReturn_if_fail, dReturn_val_if_fail etc. are encouraged.
+     * The MSG macro is extensively used to output additional information
+       to the calling terminal.
+
+     _________________________________________________________________
+
+  C++
+
+   Source code in C++ should follow the same rules with these exceptions:
+
+     * Class method names are camel-cased and start with lowercase
+       e.g. appendInputMultipart
+     * Classes and types start uppercased
+       e.g. class DilloHtmlReceiver
+     * Class methods don't need to prefix its module name
+       e.g. links->get()
+
+   We also try to keep the C++ relatively simple. Dillo does use
+   inheritance and templates, but that's about all.
+
+     _________________________________________________________________
+
+  What do we get with this?
+
+     * A clear module API for Dillo; every function prefixed "a_" is to
+       be used outside the module.
+     * A way to identify where the function came from (the
+       capitalized word is the module name).
+     * An inner ADT (Abstract data type) for the module that can be
+       isolated, tested and replaced independently.
+     * A two stage instance for bug-fixing. You can change the exported
+       function algorithms while someone else fixes the internal
+       module-ADT!
+     * A coding standard ;)
+     _________________________________________________________________
+
+        Naming&Coding design by Jorge Arellano Cid