Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time
	    E     X     T     E     N     S     I     B     L     E
            |#%#&&.  |##&%&#  |#\  /|#    /#\     ,&#%#&.  ,&##%#&.
            |#   |#  |#       |#&\/&|#   /%:#\   |#        |#
            |#   |#  |##&%&#  |#    |#  |#   |#  |#        `+&#%#+,
            |#   |#  |#       |#    |#  |####|#  |#              |#
            |#$$$|#  |##&%&#  |#    |#  |#   |#  `+#%#&#~  ~&#%&#^
        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

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


			 --- 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 | m

(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.
m -- Make a MAKE-FOO function according to the class. (Exported if class is also
     requested to be exported.)

	   --- 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.


An extensible Common Lisp utility software to ease the definitions in language by supplying a standard syntax.







No releases published


No packages published