E     X     T     E     N     S     I     B     L     E
                                        
            |#%#&&.  |##&%&#  |#\  /|#    /#\     ,&#%#&.  ,&##%#&.
            |#   |#  |#       |#&\/&|#   /%:#\   |#        |#
            |#   |#  |##&%&#  |#    |#  |#   |#  |#        `+&#%#+,
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        D    E    F    I    N    E    R       M    A    C    R    O    S
					
Demacs is an extensible Common Lisp utility software to ease the definitions in
language by supplying a standard syntax. Demacs is written from scratch with the
idea of syntax of cl-def[1] in mind. Despite there are some other definer
utilities in the wide (e.g. definer[2], cl-def[1]), almost all of them lack of
at least one of below functionalities.

- Extensibility. (definer[2] doesn't support extensions.)

- Affordable dependency. (cl-def[1] depends on some libraries, and those
  libraries depend on some other libraries and so on... You're required to
  install a dozen of libraries to benefit from a single definer utility.
  Furthermore, a major portion of related libraries are not available via
  ASDF-INSTALL.)

To summarize, demacs is implemented with KISS[3] principle in mind. And as a
bonus, demacs has no library dependencies.

[1] http://common-lisp.net/project/cl-def/
[2] http://www.common-lisp.net/project/definer
[3] http://en.wikipedia.org/wiki/KISS_principle



			 --- S   Y   N   T   A   X ---

(def function-spec name lambda-list [[declaration* | documentation]] form*)
function-spec ::= function |  (function {function-option}*)
function-option ::= i | o | d | e

(def macro-spec name macro-lambda-list [[declaration* | documentation]] form*)
macro-spec ::= macro | (macro {macro-option}*)
macro-option ::= o | d | e

(def compiler-macro-spec name macro-lambda-list [[declaration* | documentation]] form*)
compiler-macro-spec ::= compiler-macro | (compiler-macro {macro-option*})

(def generic-spec name gf-lambda-list [[{method-description}*]])
generic-spec ::= generic | (generic {generic-option}* [[gf-option*]])
generic-option ::= o | d | e

(def method-spec name specialized-lambda-list [[declaration* | documentation]] form*)
method-spec ::= method | (method {method-option}* [[method-qualifier*]])
method-option ::= o | d

(def (type-spec) name deftype-lambda-list [[declaration* | documentation]] form*)
type-spec ::= type | (type {type-option}*)
type-option ::= e

(def print-object-spec object (self stream) [[declaration* | documentation]] form*)
print-object-spec ::= print-object | (print-object &key print-identity print-type package)

(def setf-spec name defsetf-lambda-list (new-value) [[declaration* | documentation]] form*)
setf-spec ::= setf | (setf {setf-option}*)
setf-option ::= o | d

(def constant-spec name value)
constant-spec ::= constant | (constant {variable-option}* &key test documentation)
variable-option := e

(def special-variable-spec name [value])
special-variable-spec ::= special-variable | (special-variable {variable-option}* &key documentation)

(def symbol-macro-spec name form)
symbol-macro-spec ::= symbol-macro | (symbol-macro {variable-option}*)

(def class-spec name ({superclass}*) ({slot-specifier}*) [[class-option]])
class-spec ::= class | (class {class-option}* &key initarg-format accessor-format reader-format writer-format)
class-option ::= e | a | s | n | c | r | w

(def condition-spec name (parent-type*) ({slot-spec}*) option*)
condition-spec ::= condition | (condition {class-option}* &key initarg-format accessor-format reader-format writer-format)

(def struct-spec name-and-options [documentation] {slot-description}*)
name-and-options ::= structure-name | (structure-name [[options]])
struct-spec ::= struct | (struct {class-option}*)

i -- Inline function.
o -- Make optimization declarations.
d -- Make debugging declarations.
e -- Export function.
a -- Export class accessors.
s -- Export slot symbols.
n -- Introduce :INITARG keywords into slot specifiers.
c -- Introduce :ACCESSOR keywords into slot specifiers.
r -- Introduce :READER keywords into slot specifiers.
w -- Introduce :WRITER keywords into slot specifiers.


	   --- E   X   T   E   N   S   I   B   I   L   I   T   Y ---

All definers in demacs first inherits DEFINER class. And based on DEFINER class,
INITIALIZE-DEFINER and EXPAND-DEFINER gets called. Used CLOS architecture, helps
programmers to benefit from inherited classes methods and eases implementation
of definers. For instance, consider macro definer:

  (defclass macro-definer (function-definer) ())
  
  (defmethod available-definer-options ((definer macro-definer))
    (list #\o #\d #\e))
  
  (defmethod expand-definer ((definer macro-definer))
    (expand-function-like-definer definer 'defmacro))

There are various helper functions served with the package to ease the
implementation of new definers. Decide which file fits better to your new
definer -- Will it have a function-like, variable-like or miscelanous form? --
and check the existing samples in the existing file.


	       --- I   N   D   E   N   T   A   T   I   O   N ---

Because of definer macros don't play well with the existing lisp indentation
semantics of editors, it can sometimes become a pain to indent definer forms in
an appropriate style. To solve this problem, see indentation scripts supplied
under contrib directory.