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codingStyleGuide: updated and generated the pdf version. GUIDELINES removed.

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doc/GUIDELINES
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The guidelines document the current style or a recommended style for
documenting OpenFOAM source code (.C and .H) files.
General
~~~~~~~
- For readability in the comment blocks, certain tags are used that are
translated by pre-filtering the file before sending it to doxygen.
- The tags start in column 1, the contents follow on the next lines and
indented by 4 spaces. The filter removes the leading 4 spaces from the
following lines until the next tag that starts in column 1.
- The 'Class' and 'Description' tags are the most important ones.
- The first paragraph following the 'Description' will be used for the brief
description, the remaining paragraphs become the detailed description.
eg,
|-------------------------
|
|Class
| Foam::myClass
|
|Description
| A class for specifying the documentation style.
|
| The class is implemented as a set of recommendations that may
| sometimes be useful.
|
|-------------------------
- The class name must be qualified by its namespace, otherwise doxygen
will think you are documenting some other class.
- If you don't have anything to say about the class (at the moment),
use the namespace-qualified class name for the description.
This aids with finding these under-documented classes later.
eg,
|-------------------------
|
|Class
| Foam::myUnderDocumentedClass
|
|Description
| Foam::myUnderDocumentedClass
|
|-------------------------
- Use 'Class' and 'Namespace' tags in the header files.
The Description block then applies to documenting the class.
- Use 'InClass' and 'InNamespace' in the source files.
The Description block then applies to documenting the file itself.
eg,
|-------------------------
|
|InClass
| Foam::myClass
|
|Description
| Implements the read and writing of files.
|
|-------------------------
Doxygen Special Commands
~~~~~~~~~~~~~~~~~~~~~~~~
Doxygen has a large number of special commands with a '\' prefix or
a (alternatively) an '@' prefix.
The '@' prefix form is recommended for most doxygen specials, since it has
the advantage of standing out. It also happens to be what projects like gcc
and VTK are using.
The '\' prefix form, however, looks a bit better for the '\n' newline command
and when escaping single characters - eg, '\@', '\<', '\>', etc.
Since the filtering removes the leading 4 spaces within the blocks,
the doxygen commmands can be inserted within the block without problems.
eg,
|-------------------------
|
|InClass
| Foam::myClass
|
|Description
| Implements the read and writing of files.
|
| An example input file:
| @verbatim
| patchName
| {
| type myPatchType;
| refValue 100;
| value uniform 1;
| }
| @endverbatim
|
| Within the implementation, a loop over all patches is done:
| @code
| forAll(patches, patchI)
| {
| ... // some operation
| }
| @endcode
|
|-------------------------
HTML Special Commands
~~~~~~~~~~~~~~~~~~~~~
Since Doxygen also handles HTML tags to a certain extent, the angle brackets
need quoting in the documentation blocks. Non-HTML tags cause doxygen to
complain, but seem to work anyhow.
eg,
The template with type <HR> is a bad example.
The template with type \<HR\> is a better example.
The template with type <Type> causes doxygen to complain about
an unknown html type, but it seems to work okay anyhow.
Documenting Namespaces
~~~~~~~~~~~~~~~~~~~~~~
- If namespaces are explictly declared with the Namespace() macro,
they should be documented there.
- If the namespaces is used to hold sub-models, the namespace can be
documented in the same file as the class with the model selector.
eg,
documented namespace 'Foam::functionEntries' within the
class 'Foam::functionEntry'
- If nothing else helps, find some sensible header.
eg,
namespace 'Foam' is documented in the foamVersion.H file
Documenting Typedefs and classes defined via macros
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
... not yet properly resolved
Documenting Applications
~~~~~~~~~~~~~~~~~~~~~~~~
Any number of classes might be defined by a particular application, but
these classes will not, however, be available to other parts of OpenFOAM. At
the moment, the sole purpuse for running doxygen on the applications is to
extract program usage information for the '-doc' option.
The documentation for a particular application is normally contained within
the first comment block in a .C source file. The solution is this to invoke
a special filter for the "applications/{solver,utilities}" directories that
only allows the initial comment block for the .C files through.
The layout of the application documentation has not yet been finalized, but
foamToVTK shows an initial attempt.
Ignored files and directories
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ignore directories of linked files
- */lnInclude/*
Ignore test directories
- */t/*
Ignore applications that clutter everything
Ignore application-specific classes
- */applications/utilities/*.H
- */applications/solvers/*.H
Orthography (always good for a flame-war)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Given the origins of OpenFOAM, the British spellings (eg, neighbour and not
neighbor) are generally favoured. For code sections that interact with
external libraries, it can be useful to adopt American spellings, especially
for names that constitute a significant part of the external library - eg,
'color' within graphics sub-systems.
Both '-ize' and the '-ise' variant are found in the code comments.
If used as a variable or class method name, it is probably better to use '-ize',
which is considered the main form by the Oxford University Press.
Eg,
myClass.initialize()
The word "its" (possesive) vs. "it's" (colloquial for "it is" or "it has")
seems to confuse non-native (and some native) English speakers.
It is better to donate the extra keystrokes and write "it is" or "it has".
Any remaining "it's" are likely an incorrect spelling of "its".
Housekeeping
~~~~~~~~~~~~
The doc/Doxygen/tools directory contains miscellaneous scripts for finding
and possibly repairing documentation issues.
Updated: 2009-11-27

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doc/codingStyleGuide.org
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@ -2,7 +2,7 @@
#
#+TITLE: OpenFOAM C++ style guide
#+AUTHOR: OpenCFD Ltd.
#+DATE: April 2010
#+DATE: May 2010
#+LINK: http://www.opencfd.co.uk
#+OPTIONS: author:nil ^:{}
@ -13,9 +13,9 @@
+ The normal indentation is 4 spaces per logical level.
+ Use spaces for indentation, not tab characters.
+ Avoid trailing whitespace.
+ The body of control statements (eg, if, else, while, etc).
+ The body of control statements (eg, =if=, =else=, =while=, etc).
always delineated with brace brackets. A possible exception can be
made with 'break' or 'continue' as part of a control structure.
made with =break= or =continue= as part of a control structure.
+ stream output
+ =<<= is always four characters after the start of the stream,
@ -72,16 +72,16 @@
\*---------------------------------------------------------------------------*/
#+END_EXAMPLE
*** The =.H= Files
*** The /.H/ Files
+ header file spacing
+ Leave two empty lines between sections
(as per functions in the =.C= file etc)
(as per functions in the /.C/ file etc)
+ use "//- Comment" comments in header file
+ use =//- Comment= comments in header file
+ add descriptions to class data and functions
+ destructor
+ If adding a comment to the destructor -
use //- and code as a normal function:
use =//-= and code as a normal function:
#+BEGIN_EXAMPLE
//- Destructor
@ -89,11 +89,11 @@
#+END_EXAMPLE
+ inline functions
+ Use inline functions where appropriate in a separate classNameI.H file.
+ Use inline functions where appropriate in a separate /classNameI.H/ file.
Avoid cluttering the header file with function bodies.
*** The =.C= Files
+ Do not open/close namespaces in a =.C= file
*** The /.C/ Files
+ Do not open/close namespaces in a /.C/ file
+ Fully scope the function name, i.e.
#+BEGIN_EXAMPLE
@ -113,7 +113,7 @@
EXCEPTION
When there are multiple levels of namespace, they may be used in the =.C=
When there are multiple levels of namespace, they may be used in the /.C/
file, i.e.
#+BEGIN_EXAMPLE
@ -138,7 +138,7 @@
+ const
Use everywhere it is applicable.
+ variable initialisation using "="
+ variable initialisation using =
: const className& variableName = otherClass.data();
@ -169,7 +169,7 @@
}
#+END_EXAMPLE
NOT (no space between "if" and "(")
NOT (no space between =if= and =(=)
#+BEGIN_EXAMPLE
if(condition)
@ -201,7 +201,7 @@
}
#+END_EXAMPLE
NOT (no space between "for" and "(")
NOT (no space between =for= and =(=)
#+BEGIN_EXAMPLE
for(i = 0; i < maxI; i++)
@ -245,7 +245,7 @@
**** Splitting return type and function name
+ split initially after the function return type and left align
+ do not put "const" onto its own line - use a split to keep it with
+ do not put =const= onto its own line - use a split to keep it with
the function name and arguments.
so
@ -277,7 +277,7 @@
#+END_EXAMPLE
+ if it needs to be split again, split at the function name (leaving
behind the preceding scoping "::"s), and again, left align, i.e.
behind the preceding scoping =::=s), and again, left align, i.e.
For example,
@ -326,16 +326,19 @@
*** Maths and Logic
+ operator spacing
+ a + b, a - b
+ a*b, a/b
+ a & b, a ^ b
+ a = b, a != b
+ a < b, a > b, a >= b, a <= b
+ a || b, a && b
#+BEGIN_EXAMPLE
a + b, a - b
a*b, a/b
a & b, a ^ b
a = b, a != b
a < b, a > b, a >= b, a <= b
a || b, a && b
#+END_EXAMPLE
+ splitting formulae over several lines
Split and indent as per "splitting long lines at an "=""
Split and indent as per "splitting long lines at an ="
with the operator on the lower line. Align operator so that first
variable, function or bracket on the next line is 4 spaces indented i.e.
@ -525,9 +528,9 @@
option.
The documentation for a particular application is normally contained
within the first comment block in a =.C= source file. The solution is this
to invoke a special filter for the "applications/{solver,utilities}"
directories that only allows the initial comment block for the =.C= files
within the first comment block in a /.C/ source file. The solution is this
to invoke a special filter for the "/applications/{solver,utilities}/"
directories that only allows the initial comment block for the /.C/ files
through.
The layout of the application documentation has not yet been finalized,
@ -551,10 +554,7 @@
myClass.initialize()
#+END_EXAMPLE
The word "its" (possesive) vs. "it's" (colloquial for "it is" or "it has")
seems to confuse non-native (and some native) English speakers.
It is better to donate the extra keystrokes and write "it is" or "it has".
Any remaining "it's" are likely an incorrect spelling of "its".

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