| 1 | ;;; -*- Package: Hemlock; Log: hemlock.log -*-
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| 2 | ;;;
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| 3 | ;;; **********************************************************************
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| 4 | ;;; This code was written as part of the CMU Common Lisp project at
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| 5 | ;;; Carnegie Mellon University, and has been placed in the public domain.
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| 6 | ;;;
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| 7 | (hemlock-ext:file-comment
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| 8 | "$Header$")
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| 9 | ;;;
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| 10 | ;;; **********************************************************************
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| 11 | ;;;
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| 12 | ;;; This file implements typescript streams.
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| 13 | ;;;
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| 14 | ;;; A typescript stream is a bidirectional stream which uses remote
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| 15 | ;;; function calls to interact with a Hemlock typescript buffer. That
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| 16 | ;;; is: the code in this file is executed on the slave side.
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| 17 | ;;;
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| 18 | ;;; Written by William Lott.
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| 19 | ;;;
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| 20 |
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| 21 | (in-package :hemlock)
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| 22 |
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| 23 | |
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| 24 |
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| 25 | ;;;; Ts-streams.
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| 26 |
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| 27 | (defconstant ts-stream-output-buffer-size 512)
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| 28 |
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| 29 | (defclass ts-stream (hi::fundamental-character-output-stream
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| 30 | hi::fundamental-character-input-stream)
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| 31 | ((wire
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| 32 | :initarg :wire
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| 33 | :initform nil
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| 34 | :accessor ts-stream-wire)
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| 35 |
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| 36 | (typescript
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| 37 | :initarg :typescript
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| 38 | :initform nil
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| 39 | :accessor ts-stream-typescript)
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| 40 |
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| 41 | (output-buffer
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| 42 | :initarg :output-buffer
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| 43 | :initform (make-string ts-stream-output-buffer-size)
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| 44 | :accessor ts-stream-output-buffer
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| 45 | :type simple-string)
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| 46 |
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| 47 | (output-buffer-index
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| 48 | :initarg :output-buffer-index
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| 49 | :initform 0
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| 50 | :accessor ts-stream-output-buffer-index
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| 51 | :type fixnum)
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| 52 |
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| 53 | (char-pos
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| 54 | :initarg :char-pos
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| 55 | :initform 0
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| 56 | :accessor ts-stream-char-pos
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| 57 | :type fixnum
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| 58 | :documentation "The current output character position on the line, returned by the :CHARPOS method.")
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| 59 |
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| 60 | (line-length
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| 61 | :initarg :line-length
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| 62 | :initform 80
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| 63 | :accessor ts-stream-line-length
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| 64 | :documentation "The current length of a line of output. Returned by STREAM-LINE-LENGTH method.")
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| 65 |
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| 66 | (current-input
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| 67 | :initarg :current-input
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| 68 | :initform nil
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| 69 | :accessor ts-stream-current-input
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| 70 | :type list
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| 71 | :documentation "This is a list of strings and stream-commands whose order manifests the
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| 72 | input provided by remote procedure calls into the slave of
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| 73 | TS-STREAM-ACCEPT-INPUT.")
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| 74 |
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| 75 | (input-read-index
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| 76 | :initarg :input-read-index
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| 77 | :initform 0
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| 78 | :accessor ts-stream-input-read-index
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| 79 | :type fixnum)))
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| 80 |
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| 81 | (defun make-ts-stream (wire typescript)
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| 82 | (make-instance 'ts-stream :wire wire :typescript typescript))
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| 83 |
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| 84 | |
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| 85 |
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| 86 | ;;;; Conditions.
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| 87 |
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| 88 | (define-condition unexpected-stream-command (error)
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| 89 | ;; Context is a string to be plugged into the report text.
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| 90 | ((context :reader unexpected-stream-command-context :initarg :context))
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| 91 | (:report (lambda (condition stream)
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| 92 | (format stream "~&Unexpected stream-command while ~A."
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| 93 | (unexpected-stream-command-context condition)))))
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| 94 |
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| 95 |
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| 96 | |
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| 97 |
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| 98 | ;;;; Editor remote calls into slave.
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| 99 |
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| 100 | ;;; TS-STREAM-ACCEPT-INPUT -- Internal Interface.
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| 101 | ;;;
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| 102 | ;;; The editor calls this remotely in the slave to indicate that the user has
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| 103 | ;;; provided input. Input is a string, symbol, or list. If it is a list, the
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| 104 | ;;; the CAR names the command, and the CDR is the arguments.
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| 105 | ;;;
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| 106 | (defun ts-stream-accept-input (remote input)
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| 107 | (let ((stream (hemlock.wire:remote-object-value remote)))
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| 108 | (hemlock-ext:without-interrupts
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| 109 | (hemlock-ext:without-gcing
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| 110 | (setf (ts-stream-current-input stream)
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| 111 | (nconc (ts-stream-current-input stream)
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| 112 | (list (etypecase input
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| 113 | (string
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| 114 | (let ((newline
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| 115 | (position #\newline input :from-end t)))
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| 116 | (setf (ts-stream-char-pos stream)
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| 117 | (if newline
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| 118 | (- (length input) newline 1)
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| 119 | (length input)))
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| 120 | input))
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| 121 | #+NILGB
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| 122 | (cons
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| 123 | (ext:make-stream-command (car input)
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| 124 | (cdr input)))
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| 125 | #+NILGB
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| 126 | (symbol
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| 127 | (ext:make-stream-command input)))))))))
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| 128 | nil)
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| 129 |
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| 130 | ;;; TS-STREAM-SET-LINE-LENGTH -- Internal Interface.
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| 131 | ;;;
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| 132 | ;;; This function is called by the editor to indicate that the line-length for
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| 133 | ;;; a TS stream should now be Length.
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| 134 | ;;;
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| 135 | (defun ts-stream-set-line-length (remote length)
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| 136 | (let ((stream (hemlock.wire:remote-object-value remote)))
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| 137 | (setf (ts-stream-line-length stream) length)))
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| 138 |
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| 139 |
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| 140 | |
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| 141 |
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| 142 | ;;;; Stream methods.
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| 143 |
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| 144 | ;;; %TS-STREAM-LISTEN -- Internal.
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| 145 | ;;;
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| 146 | ;;; Determine if there is any input available. If we don't think so, process
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| 147 | ;;; all pending events, and look again.
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| 148 | ;;;
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| 149 | (defmethod hi::stream-listen ((stream ts-stream))
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| 150 | (flet ((check ()
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| 151 | (hemlock-ext:without-interrupts
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| 152 | (hemlock-ext:without-gcing
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| 153 | (loop
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| 154 | (let* ((current (ts-stream-current-input stream))
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| 155 | (first (first current)))
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| 156 | (cond ((null current)
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| 157 | (return nil))
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| 158 | #+NILGB
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| 159 | ((ext:stream-command-p first)
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| 160 | (return t))
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| 161 | ((>= (ts-stream-input-read-index stream)
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| 162 | (length (the simple-string first)))
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| 163 | (pop (ts-stream-current-input stream))
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| 164 | (setf (ts-stream-input-read-index stream) 0))
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| 165 | (t
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| 166 | (return t)))))))))
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| 167 | (or (check)
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| 168 | (progn
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| 169 | #+NILGB (system:serve-all-events 0)
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| 170 | (check)))))
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| 171 |
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| 172 | ;;; %TS-STREAM-IN -- Internal.
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| 173 | ;;;
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| 174 | ;;; The READ-CHAR stream method.
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| 175 | ;;;
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| 176 | (defmethod hi::stream-read-char ((stream ts-stream))
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| 177 | (hi::stream-force-output stream)
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| 178 | (wait-for-typescript-input stream)
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| 179 | (hemlock-ext:without-interrupts
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| 180 | (hemlock-ext:without-gcing
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| 181 | (let ((first (first (ts-stream-current-input stream))))
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| 182 | (etypecase first
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| 183 | (string
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| 184 | (prog1 (schar first (ts-stream-input-read-index stream))
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| 185 | (incf (ts-stream-input-read-index stream))))
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| 186 | #+NILGB
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| 187 | (ext:stream-command
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| 188 | (error 'unexpected-stream-command
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| 189 | :context "in the READ-CHAR method")))))))
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| 190 |
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| 191 | ;;; %TS-STREAM-READ-LINE -- Internal.
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| 192 | ;;;
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| 193 | ;;; The READ-LINE stream method. Note: here we take advantage of the fact that
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| 194 | ;;; newlines will only appear at the end of strings.
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| 195 | ;;;
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| 196 |
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| 197 | (defmethod stream-read-line (stream)
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| 198 | (macrolet
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| 199 | ((next-str ()
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| 200 | '(progn
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| 201 | (wait-for-typescript-input stream)
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| 202 | (hemlock-ext:without-interrupts
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| 203 | (hemlock-ext:without-gcing
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| 204 | (let ((first (first (ts-stream-current-input stream))))
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| 205 | (etypecase first
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| 206 | (string
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| 207 | (prog1 (if (zerop (ts-stream-input-read-index stream))
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| 208 | (pop (ts-stream-current-input stream))
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| 209 | (subseq (pop (ts-stream-current-input stream))
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| 210 | (ts-stream-input-read-index stream)))
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| 211 | (setf (ts-stream-input-read-index stream) 0)))
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| 212 | #+NILGB
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| 213 | (ext:stream-command
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| 214 | (error 'unexpected-stream-command
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| 215 | :context "in the READ-CHAR method")))))))))
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| 216 | (do ((result (next-str) (concatenate 'simple-string result (next-str))))
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| 217 | ((char= (schar result (1- (length result))) #\newline)
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| 218 | (values (subseq result 0 (1- (length result)))
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| 219 | nil))
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| 220 | (declare (simple-string result)))))
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| 221 |
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| 222 | ;;; WAIT-FOR-TYPESCRIPT-INPUT -- Internal.
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| 223 | ;;;
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| 224 | ;;; Keep calling server until some input shows up.
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| 225 | ;;;
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| 226 | (defun wait-for-typescript-input (stream)
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| 227 | (unless (hi::stream-listen stream) ;for some reasons in CLISP CL:LISTEN calls STREAM-READ-CHAR :-/
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| 228 | (let ((wire (ts-stream-wire stream))
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| 229 | (ts (ts-stream-typescript stream)))
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| 230 | (hemlock-ext:without-interrupts
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| 231 | (hemlock-ext:without-gcing
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| 232 | (hemlock.wire:remote wire (ts-buffer-ask-for-input ts))
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| 233 | (hemlock.wire:wire-force-output wire)))
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| 234 | (loop
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| 235 | #+:hemlock.serve-event (hemlock.wire::serve-all-events)
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| 236 | #-:hemlock.serve-event (hemlock.wire:wire-get-object wire)
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| 237 | #+NILGB (sleep .1) ;###
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| 238 | (when (hi::stream-listen stream)
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| 239 | (return))))))
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| 240 |
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| 241 | ;;; %TS-STREAM-FLSBUF --- internal.
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| 242 | ;;;
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| 243 | ;;; Flush the output buffer associated with stream. This should only be used
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| 244 | ;;; inside a without-interrupts and without-gcing.
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| 245 | ;;;
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| 246 | (defun %ts-stream-flsbuf (stream)
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| 247 | (when (and (ts-stream-wire stream)
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| 248 | (ts-stream-output-buffer stream)
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| 249 | (not (zerop (ts-stream-output-buffer-index stream))))
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| 250 | (hemlock.wire:remote (ts-stream-wire stream)
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| 251 | (ts-buffer-output-string
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| 252 | (ts-stream-typescript stream)
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| 253 | (subseq (the simple-string (ts-stream-output-buffer stream))
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| 254 | 0
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| 255 | (ts-stream-output-buffer-index stream))))
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| 256 | (setf (ts-stream-output-buffer-index stream) 0)))
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| 257 |
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| 258 | ;;; %TS-STREAM-OUT --- internal.
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| 259 | ;;;
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| 260 | ;;; Output a single character to stream.
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| 261 | ;;;
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| 262 | (defmethod hi::stream-write-char ((stream ts-stream) char)
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| 263 | (declare (base-char char))
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| 264 | (hemlock-ext:without-interrupts
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| 265 | (hemlock-ext:without-gcing
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| 266 | (when (= (ts-stream-output-buffer-index stream)
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| 267 | ts-stream-output-buffer-size)
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| 268 | (%ts-stream-flsbuf stream))
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| 269 | (setf (schar (ts-stream-output-buffer stream)
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| 270 | (ts-stream-output-buffer-index stream))
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| 271 | char)
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| 272 | (incf (ts-stream-output-buffer-index stream))
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| 273 | (incf (ts-stream-char-pos stream))
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| 274 | (when (= (char-code char)
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| 275 | (char-code #\Newline))
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| 276 | (%ts-stream-flsbuf stream)
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| 277 | (setf (ts-stream-char-pos stream) 0)
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| 278 | (hemlock.wire:wire-force-output (ts-stream-wire stream)))
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| 279 | char)))
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| 280 |
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| 281 | ;;; %TS-STREAM-SOUT --- internal.
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| 282 | ;;;
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| 283 | ;;; Output a string to stream.
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| 284 | ;;;
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| 285 | (defmethod hi::stream-write-string ((stream ts-stream) string &optional (start 0) (end (length string)))
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| 286 | ;; This can't be true generally: --GB
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| 287 | #+NIL (declare (simple-string string))
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| 288 | (declare (fixnum start end))
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| 289 | (let ((wire (ts-stream-wire stream))
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| 290 | (newline (position #\Newline string :start start :end end :from-end t))
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| 291 | (length (- end start)))
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| 292 | (when wire
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| 293 | (hemlock-ext:without-interrupts
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| 294 | (hemlock-ext:without-gcing
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| 295 | (let ((index (ts-stream-output-buffer-index stream)))
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| 296 | (cond ((> (+ index length)
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| 297 | ts-stream-output-buffer-size)
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| 298 | (%ts-stream-flsbuf stream)
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| 299 | (hemlock.wire:remote wire
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| 300 | (ts-buffer-output-string (ts-stream-typescript stream)
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| 301 | (subseq string start end)))
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| 302 | (when newline
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| 303 | (hemlock.wire:wire-force-output wire)))
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| 304 | (t
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| 305 | (replace (the simple-string (ts-stream-output-buffer stream))
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| 306 | string
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| 307 | :start1 index
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| 308 | :end1 (+ index length)
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| 309 | :start2 start
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| 310 | :end2 end)
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| 311 | (incf (ts-stream-output-buffer-index stream)
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| 312 | length)
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| 313 | (when newline
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| 314 | (%ts-stream-flsbuf stream)
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| 315 | (hemlock.wire:wire-force-output wire)))))
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| 316 | (setf (ts-stream-char-pos stream)
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| 317 | (if newline
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| 318 | (- end newline 1)
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| 319 | (+ (ts-stream-char-pos stream)
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| 320 | length))))))))
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| 321 |
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| 322 | ;;; %TS-STREAM-UNREAD -- Internal.
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| 323 | ;;;
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| 324 | ;;; Unread a single character.
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| 325 | ;;;
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| 326 | (defmethod hi::stream-unread-char ((stream ts-stream) char)
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| 327 | (hemlock-ext:without-interrupts
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| 328 | (hemlock-ext:without-gcing
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| 329 | (let ((first (first (ts-stream-current-input stream))))
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| 330 | (cond ((and (stringp first)
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| 331 | (> (ts-stream-input-read-index stream) 0))
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| 332 | (setf (schar first (decf (ts-stream-input-read-index stream)))
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| 333 | char))
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| 334 | (t
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| 335 | (push (string char) (ts-stream-current-input stream))
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| 336 | (setf (ts-stream-input-read-index stream) 0)))))))
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| 337 |
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| 338 | ;;; %TS-STREAM-CLOSE --- internal.
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| 339 | ;;;
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| 340 | ;;; Can't do much, 'cause the wire is shared.
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| 341 | ;;;
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| 342 | (defmethod close ((stream ts-stream) &key abort)
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| 343 | (unless abort
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| 344 | (force-output stream))
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| 345 | #+NILGB (lisp::set-closed-flame stream) ;Hugh!? what is that? --GB
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| 346 | )
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| 347 |
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| 348 | ;;; %TS-STREAM-CLEAR-INPUT -- Internal.
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| 349 | ;;;
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| 350 | ;;; Pass the request to the editor and clear any buffered input.
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| 351 | ;;;
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| 352 | (defmethod hi::stream-clear-input ((stream ts-stream))
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| 353 | (hemlock-ext:without-interrupts
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| 354 | (hemlock-ext:without-gcing
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| 355 | (when (ts-stream-wire stream)
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| 356 | (hemlock.wire:remote-value (ts-stream-wire stream)
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| 357 | (ts-buffer-clear-input (ts-stream-typescript stream))))
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| 358 | (setf (ts-stream-current-input stream) nil
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| 359 | (ts-stream-input-read-index stream) 0))))
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| 360 |
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| 361 | (defmethod hi::stream-finish-output ((stream ts-stream))
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| 362 | (when (ts-stream-wire stream)
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| 363 | (hemlock-ext:without-interrupts
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| 364 | (hemlock-ext:without-gcing
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| 365 | (%ts-stream-flsbuf stream)
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| 366 | ;; Note: for the return value to come back,
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| 367 | ;; all pending RPCs must have completed.
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| 368 | ;; Therefore, we know it has synced.
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| 369 | (hemlock.wire:remote-value (ts-stream-wire stream)
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| 370 | (ts-buffer-finish-output (ts-stream-typescript stream))))))
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| 371 | t)
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| 372 |
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| 373 | (defmethod hi::stream-force-output ((stream ts-stream))
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| 374 | (when (ts-stream-wire stream)
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| 375 | (hemlock-ext:without-interrupts
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| 376 | (hemlock-ext:without-gcing
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| 377 | (%ts-stream-flsbuf stream)
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| 378 | (hemlock.wire:wire-force-output (ts-stream-wire stream)))))
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| 379 | t)
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| 380 |
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| 381 | (defmethod hi::stream-line-column ((stream ts-stream))
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| 382 | (ts-stream-char-pos stream))
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| 383 |
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| 384 | (defmethod hi::stream-line-length ((stream ts-stream))
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| 385 | (ts-stream-line-length stream))
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| 386 |
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| 387 | #+NILGB ;; -- hmm.
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| 388 | (defmethod interactive-stream-p ((stream ts-stream))
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| 389 | t)
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| 390 |
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| 391 | (defmethod hi::stream-clear-output ((stream ts-stream))
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| 392 | (setf (ts-stream-output-buffer-index stream) 0))
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| 393 |
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| 394 | ;;; %TS-STREAM-MISC -- Internal.
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| 395 | ;;;
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| 396 | ;;; The misc stream method.
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| 397 | ;;;
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| 398 | #+NILGB
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| 399 | (defun %ts-stream-misc (stream operation &optional arg1 arg2)
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| 400 | (case operation
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| 401 | (:get-command
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| 402 | (wait-for-typescript-input stream)
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| 403 | (hemlock-ext:without-interrupts
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| 404 | (hemlock-ext:without-gcing
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| 405 | (etypecase (first (ts-stream-current-input stream))
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| 406 | (stream-command
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| 407 | (setf (ts-stream-input-read-index stream) 0)
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| 408 | (pop (ts-stream-current-input stream)))
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| 409 | (string nil)))))
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| 410 | ))
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| 411 |
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| 412 | ;; $Log$
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| 413 | ;; Revision 1.1 2003/10/19 08:57:16 gb
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| 414 | ;; Initial revision
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| 415 | ;;
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| 416 | ;; Revision 1.1.2.1 2003/08/10 19:11:40 gb
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| 417 | ;; New files, imported from upstream CVS as of 03/08/09.
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| 418 | ;;
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| 419 | ;; Revision 1.3 2003/08/05 19:51:13 gilbert
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| 420 | ;; initial slave lisp support, still not ready for prime time.
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| 421 | ;;
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| 422 | ;;
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