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;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name:          buff-input.lisp
;;;; Purpose:       Buffered line input
;;;; Programmer:    Kevin M. Rosenberg
;;;; Date Started:  Apr 2000
;;;;
;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
;;;;
;;;; KMRCL users are granted the rights to distribute and use this software
;;;; as governed by the terms of the Lisp Lesser GNU Public License
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************

(in-package :kmrcl)

(eval-when (:compile-toplevel)
  (declaim (optimize (speed 3) (safety 0) (space 0) (debug 0))))

(defconstant +max-field+ 10000)
(defconstant +max-fields-per-line+ 20)
(defconstant +field-delim+ #\|)
(defconstant +eof-char+ #\rubout)
(defconstant +newline+ #\Newline)

(declaim (type character +eof-char+ +field-delim+ +newline+)
         (type fixnum +max-field+ +max-fields-per-line+))

;; Buffered fields parsing function
;; Uses fill-pointer for size

(defun make-fields-buffer (&optional (max-fields +max-fields-per-line+)
                                   (max-field-len +max-field+))
  (let ((bufs (make-array max-fields :element-type 'vector :fill-pointer 0 :adjustable nil)))
    (dotimes (i +max-fields-per-line+)
      (setf (aref bufs i) (make-array max-field-len :element-type 'character :fill-pointer 0 :adjustable nil)))
    bufs))

(defun read-buffered-fields (fields strm &optional (field-delim +field-delim+)
                             (eof 'eof))
  "Read a line from a stream into a field buffers"
  (declare (type base-char field-delim)
           (type vector fields))
  (setf (fill-pointer fields) 0)
  (do ((ifield 0 (1+ ifield))
       (linedone nil)
       (is-eof nil))
      (linedone (if is-eof eof fields))
    (declare (type fixnum ifield)
             (type boolean linedone is-eof))
    (let ((field (aref fields ifield)))
      (declare (type base-string field))
      (do ((ipos 0)
           (fielddone nil)
           (rc (read-char strm nil +eof-char+)
              (read-char strm nil +eof-char+)))
          (fielddone (unread-char rc strm))
        (declare (type fixnum ipos)
                 (type base-char rc)
                 (type boolean fielddone))
        (cond
         ((char= rc field-delim)
          (setf (fill-pointer field) ipos)
          (setq fielddone t))
         ((char= rc +newline+)
          (setf (fill-pointer field) ipos)
          (setf (fill-pointer fields) ifield)
          (setq fielddone t)
          (setq linedone t))
         ((char= rc +eof-char+)
          (setf (fill-pointer field) ipos)
          (setf (fill-pointer fields) ifield)
          (setq fielddone t)
          (setq linedone t)
          (setq is-eof t))
         (t
          (setf (char field ipos) rc)
          (incf ipos)))))))

;; Buffered fields parsing
;; Does not use fill-pointer
;; Returns 2 values -- string array and length array
(defstruct field-buffers
  (nfields 0 :type fixnum)
  (buffers)
  (field-lengths))

(defun make-fields-buffer2 (&optional (max-fields +max-fields-per-line+)
                                   (max-field-len +max-field+))
  (let ((bufs (make-array max-fields :element-type 'vector :fill-pointer nil :adjustable nil))
        (bufstruct (make-field-buffers)))
    (dotimes (i +max-fields-per-line+)
      (setf (aref bufs i) (make-array max-field-len :element-type 'character :fill-pointer nil :adjustable nil)))
    (setf (field-buffers-buffers bufstruct) bufs)
    (setf (field-buffers-field-lengths bufstruct) (make-array +max-fields-per-line+
                                                              :element-type 'fixnum :fill-pointer nil :adjustable nil))
    (setf (field-buffers-nfields bufstruct) 0)
    bufstruct))


(defun read-buffered-fields2 (fields strm &optional (field-delim +field-delim+)
                              (eof 'eof))
  "Read a line from a stream into a field buffers"
  (declare (character field-delim))
  (setf (field-buffers-nfields fields) 0)
  (do ((ifield 0 (1+ ifield))
       (linedone nil)
       (is-eof nil))
      (linedone (if is-eof eof fields))
    (declare (fixnum ifield)
             (t linedone is-eof))
    (let ((field (aref (field-buffers-buffers fields) ifield)))
      (declare (simple-string field))
      (do ((ipos 0)
           (fielddone nil)
           (rc (read-char strm nil +eof-char+)
              (read-char strm nil +eof-char+)))
          (fielddone (unread-char rc strm))
        (declare (fixnum ipos)
                 (character rc)
                 (t fielddone))
        (cond
         ((char= rc field-delim)
          (setf (aref (field-buffers-field-lengths fields) ifield) ipos)
          (setq fielddone t))
         ((char= rc +newline+)
          (setf (aref (field-buffers-field-lengths fields) ifield) ipos)
          (setf (field-buffers-nfields fields) ifield)
          (setq fielddone t)
          (setq linedone t))
         ((char= rc +eof-char+)
          (setf (aref (field-buffers-field-lengths fields) ifield) ipos)
          (setf (field-buffers-nfields fields) ifield)
          (setq fielddone t)
          (setq linedone t)
          (setq is-eof t))
         (t
          (setf (char field ipos) rc)
          (incf ipos)))))))

(defun bfield (fields i)
  (if (>= i (field-buffers-nfields fields))
      nil
    (subseq (aref (field-buffers-buffers fields) i) 0 (aref (field-buffers-field-lengths fields) i))))

;;; Buffered line parsing function

(defconstant +max-line+ 20000)
(let ((linebuffer (make-array +max-line+
                              :element-type 'character
                              :fill-pointer 0)))
  (defun read-buffered-line (strm eof)
    "Read a line from astream into a vector buffer"
    (declare (optimize (speed 3) (space 0) (safety 0)))
    (let ((pos 0)
          (done nil))
      (declare (fixnum pos) (type boolean done))
      (setf (fill-pointer linebuffer) 0)
      (do ((c (read-char strm nil +eof-char+)
              (read-char strm nil +eof-char+)))
          (done (progn
                  (unless (eql c +eof-char+) (unread-char c strm))
                  (if (eql c +eof-char+) eof linebuffer)))
        (declare (character c))
        (cond
         ((>= pos +max-line+)
          (warn "Line overflow")
          (setf done t))
         ((char= c #\Newline)
          (when (plusp pos)
            (setf (fill-pointer linebuffer) (1- pos)))
          (setf done t))
         ((char= +eof-char+)
          (setf done t))
         (t
          (setf (char linebuffer pos) c)
          (incf pos)))))))