;;; ports.bm --- Port I/O.         -*- mode: scheme; coding: utf-8; -*-
;;;
;;; Copyright (C) 2010, 2011, 2012, 2014 Free Software Foundation, Inc.
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public License
;;; as published by the Free Software Foundation; either version 3, or
;;; (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this software; see the file COPYING.LESSER.  If
;;; not, write to the Free Software Foundation, Inc., 51 Franklin
;;; Street, Fifth Floor, Boston, MA 02110-1301 USA

(define-module (benchmarks ports)
  #:use-module (ice-9 rdelim)
  #:use-module (benchmark-suite lib))

(define-syntax sequence
  (lambda (s)
    ;; Create a sequence `(begin EXPR ...)' with COUNT occurrences of EXPR.
    (syntax-case s ()
      ((_ expr count)
       (number? (syntax->datum #'count))
       (cons #'begin
             (make-list (syntax->datum #'count) #'expr))))))

(define (large-string s)
  (string-concatenate (make-list (* iteration-factor 10000) s)))

(define %latin1-port
  (with-fluids ((%default-port-encoding #f))
    (open-input-string (large-string "hello, world"))))

(define %utf8/ascii-port
  (with-fluids ((%default-port-encoding "UTF-8"))
    (open-input-string (large-string "hello, world"))))

(define %utf8/wide-port
  (with-fluids ((%default-port-encoding "UTF-8"))
    (open-input-string (large-string "안녕하세요"))))


(with-benchmark-prefix "peek-char"

  (benchmark "latin-1 port" 700
    (sequence (peek-char %latin1-port) 1000))

  (benchmark "utf-8 port, ascii character" 700
    (sequence (peek-char %utf8/ascii-port) 1000))

  (benchmark "utf-8 port, Korean character" 700
    (sequence (peek-char %utf8/wide-port) 1000)))

(with-benchmark-prefix "char-ready?"

  (benchmark "latin-1 port" 10000
    (sequence (char-ready? %latin1-port) 1000))

  (benchmark "utf-8 port, ascii character" 10000
    (sequence (char-ready? %utf8/ascii-port) 1000))

  (benchmark "utf-8 port, Korean character" 10000
    (sequence (char-ready? %utf8/wide-port) 1000)))

;; Keep the `read-char' benchmarks last as they consume input from the
;; ports.

(with-benchmark-prefix "read-char"

  (benchmark "latin-1 port" 10000
    (sequence (read-char %latin1-port) 1000))

  (benchmark "utf-8 port, ascii character" 10000
    (sequence (read-char %utf8/ascii-port) 1000))

  (benchmark "utf-8 port, Korean character" 10000
    (sequence (read-char %utf8/wide-port) 1000)))


(with-benchmark-prefix "rdelim"

  (let ((str (string-concatenate (make-list 1000 "one line\n"))))
    (benchmark "read-line" 1000
               (let ((port (with-fluids ((%default-port-encoding "UTF-8"))
                             (open-input-string str))))
                 (sequence (read-line port) 1000))))

  (let ((str (large-string "Hello, world.\n")))
    (benchmark "read-string" 200
               (let ((port (with-fluids ((%default-port-encoding "UTF-8"))
                             (open-input-string str))))
                 (read-string port)))))
