Macros.carp

;; Defining the meta data macros early so that they can be used by all the other code.

(meta-set! doc "doc" "Set documentation for a binding.")
(defmacro doc [name string]
  (list 'meta-set! name "doc" string))

(doc print-doc "Print the documentation for a binding.")
(defmacro print-doc [name]
  (list 'macro-log (list 'meta name "doc")))

(doc sig "Annotate a binding with the desired signature.")
(defmacro sig [name signature]
  (list 'meta-set! name "sig" signature))

(doc print-sig "Print the annotated signature for a binding.")
(defmacro print-sig [name]
  (list 'macro-log (list 'meta name "sig")))

(doc hide "Mark a binding as hidden, this will make it not print with the 'info' command.")
(defmacro hidden [name]
  (list 'meta-set! name "hidden" true))

(doc private "Mark a binding as private, this will make it inaccessible from other modules.")
(defmacro private [name]
  (list 'meta-set! name "private" true))

(doc private? "Is this binding private?")
(defmacro private? [name]
  (list 'not (list '= () (list 'meta name "private")))) ;; TODO: This is buggy, will report true when meta is set to 'false'!

(doc hidden? "Is this binding hidden?")
(defmacro hidden? [name]
  (list 'not (list '= () (list 'meta name "hidden")))) ;; TODO: This is buggy, will report true when meta is set to 'false'!


(defmodule Dynamic
  (defdynamic caar [pair] (car (car pair)))
  (defdynamic cadr [pair] (car (cdr pair)))
  (defdynamic cdar [pair] (cdr (car pair)))
  (defdynamic cddr [pair] (cdr (cdr pair)))
  (defdynamic caaar [pair] (car (car (car pair))))
  (defdynamic caadr [pair] (car (car (cdr pair))))
  (defdynamic cadar [pair] (car (cdr (car pair))))
  (defdynamic cdaar [pair] (cdr (car (car pair))))
  (defdynamic caddr [pair] (car (cdr (cdr pair))))
  (defdynamic cdadr [pair] (cdr (car (cdr pair))))
  (defdynamic cddar [pair] (cdr (cdr (car pair))))
  (defdynamic cdddr [pair] (cdr (cdr (cdr pair))))
  (defdynamic caaaar [pair] (car (car (car (car pair)))))
  (defdynamic caaadr [pair] (car (car (car (cdr pair)))))
  (defdynamic caadar [pair] (car (car (cdr (car pair)))))
  (defdynamic caaddr [pair] (car (car (cdr (cdr pair)))))
  (defdynamic cadaar [pair] (car (cdr (car (car pair)))))
  (defdynamic cadadr [pair] (car (cdr (car (cdr pair)))))
  (defdynamic caddar [pair] (car (cdr (cdr (car pair)))))
  (defdynamic cadddr [pair] (car (cdr (cdr (cdr pair)))))
  (defdynamic cdaaar [pair] (cdr (car (car (car pair)))))
  (defdynamic cdaadr [pair] (cdr (car (car (cdr pair)))))
  (defdynamic cdadar [pair] (cdr (car (cdr (car pair)))))
  (defdynamic cdaddr [pair] (cdr (car (cdr (cdr pair)))))
  (defdynamic cddaar [pair] (cdr (cdr (car (car pair)))))
  (defdynamic cddadr [pair] (cdr (cdr (car (cdr pair)))))
  (defdynamic cdddar [pair] (cdr (cdr (cdr (car pair)))))
  (defdynamic cddddr [pair] (cdr (cdr (cdr (cdr pair)))))

  (defdynamic eval-internal [form]
    (list 'do
          (list 'defn 'main [] (list 'IO.println* form))
          (list 'build)
          (list 'run)))

  (defmacro eval [form]
    (eval-internal form))

  (defmacro e [form]
    (eval-internal form))

  )

(defdynamic cond-internal [xs]
  (if (= (length xs) 0)
    (list)
    (if (= (length xs) 2)
      (macro-error "cond has even number of branches; add an else branch")
      (if (= (length xs) 1)
        (car xs)
        (list
         'if
         (car xs)
         (cadr xs)
         (cond-internal (cddr xs)))))))

(defmacro cond [:rest xs]
  (cond-internal xs))

(defmacro for [settings :rest body] ;; settings = variable, from, to, <step>
  (if (> (length body) 1)
    (macro-error "Warning: the body of the 'for' loop can only contain one expression")
    (list
     'let
     (array (car settings) (cadr settings))
     (list
      'while
      (list 'Int.< (car settings) (caddr settings))
      (list 'do
            (if (= (length body) 0)
              ()
              (if (list? body)
                (car body)
                body))
            (list
             'set! (car settings)
             (list 'Int.+
                   (car settings)
                   (if (= 4 (length settings)) ;; optional arg for step
                     (cadddr settings)
                     1))))))))

(defmacro refstr [x]
  (list 'ref
        (list 'str x)))

;; Old foreach, what's a better name for this? (it's just 'map' with side effects)
;; (defmacro foreach [f xs]
;;   (list 'for ['i 0 (list 'Array.length (list 'ref xs))]
;;         (list f (list 'Array.nth (list 'ref xs) 'i))))

(defdynamic foreach-internal [var xs expr]
  (list 'let ['xs xs
              'len (list 'Array.length 'xs)]
        (list 'for ['i 0 'len]
              (list 'let [var (list 'Array.nth 'xs 'i)]
                    expr))))

(defmacro foreach [binding expr]
  (if (array? binding)
    (foreach-internal (car binding) (cadr binding) expr)
    (macro-error "Binding has to be an array.")))

(defdynamic thread-first-internal [xs]
  (if (= (length xs) 2)
    (if (list? (last xs))
      (cons (caadr xs)
            (cons (car xs)
                  (cdadr xs)))
      (list (cadr xs) (car xs)))
    (if (list? (last xs))
      (append
       (list
        (car (last xs))
        (thread-first-internal (all-but-last xs)))
       (cdr (last xs)))
      (list (last xs) (thread-first-internal (all-but-last xs))))))

(defdynamic thread-last-internal [xs]
  (if (= (length xs) 2)
    (if (list? (last xs))
      (cons-last (car xs) (last xs))
      (list (cadr xs) (car xs)))
    (if (list? (last xs))
      (cons-last (thread-last-internal (all-but-last xs)) (last xs))
      (list (last xs) (thread-last-internal (all-but-last xs))))))

(defmacro => [:rest forms]
  (thread-first-internal forms))

(defmacro ==> [:rest forms]
  (thread-last-internal forms))

(defmacro swap! [x y]
  (list 'let (array 'tmp y) (list 'do (list 'set! y x) (list 'set! x 'tmp))))

(defmacro update! [x f]
  (list 'set! x (list f x)))

(defmacro mac-only [:rest forms]
  (if (= "darwin" (os))
    (cons (quote do) forms)
    ()))

(defmacro linux-only [:rest forms]
  (if (= "linux" (os))
    (cons (quote do) forms)
    ()))

(defmacro windows-only [:rest forms]
  (if (= "windows" (os))
    (cons (quote do) forms)
    ()))

(defmacro not-on-windows [:rest forms]
  (if (not (= "windows" (os)))
    (cons (quote do) forms)
    ()))

(defdynamic use-all-fn [names]
  (if (= (length names) 0)
    (macro-error "Trying to call use-all without arguments")
    (if (= (length names) 1)
      (list (list 'use (car names)))
      (cons (list 'use (car names)) (use-all-fn (cdr names))))));(use-all (cdr names))))))

(defmacro use-all [:rest names]
  (cons 'do (use-all-fn names)))

(defmacro load-and-use [name]
  (list 'do
        (list 'load (str name ".carp"))
        (list 'use name)))

(defmacro when [condition form]
  (list 'if condition form (list)))

(defmacro unless [condition form]
  (list 'if condition (list) form))

(defmacro let-do [bindings :rest forms]
  (list 'let bindings
    (cons 'do forms)))

(defmacro defn-do [name arguments :rest body]
  (list 'defn name arguments (cons 'do body)))

(defmacro comment [:rest forms]
  ())

(defmacro forever-do [:rest forms]
  (list 'while true (cons 'do forms)))

(defdynamic case-internal [name xs]
  (if (= (length xs) 0)
    (list)
    (if (= (length xs) 2)
      (macro-error "case has even number of branches; add an else branch")
      (if (= (length xs) 1)
        (car xs)
        (list 'if
         (list '= name (car xs))
          (cadr xs)
          (case-internal name (cddr xs)))))))

(defmacro case [name :rest forms]
  (case-internal name forms))

(defmacro and [x y]
  (list 'if x y false))

(defmacro or [x y]
  (list 'if x true y))

(defdynamic build-vararg [func forms]
  (if (= (length forms) 0)
    (macro-error "vararg macro needs at least one argument")
    (if (= (length forms) 1)
      (car forms)
      (list func (car forms) (build-vararg func (cdr forms))))))

(defmacro and* [:rest forms]
  (build-vararg 'and forms))

(defmacro or* [:rest forms]
  (build-vararg 'or forms))

(defdynamic build-str* [forms]
  (if (= (length forms) 0)
    (list "")
    (if (= (length forms) 1)
      (list 'str (car forms))
      (list 'StringCopy.append (list 'str (car forms)) (build-str* (cdr forms))))))

(defmacro str* [:rest forms]
  (build-str* forms))

(defmacro println* [:rest forms]
  (list 'IO.println (list 'ref (build-str* forms))))

(defmacro print* [:rest forms]
  (list 'IO.print (list 'ref (build-str* forms))))

(defmacro ignore [form]
  (list 'let (array '_ form) (list)))

;; Allows inclusion of C headers relative to the Carp file in which this macro is called.
(defmacro relative-include [file]
  (list 'local-include
        (list 'Dynamic.String.join [(list 'Dynamic.String.directory (list 'file))
                                    "/"
                                    file])))

(defmacro save-docs [:rest modules]
  ;; A trick to be able to send unquoted symbols to 'save-docs'
  (list 'save-docs-internal (list 'quote modules)))