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Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
178 lines
6.5 KiB
HTML
178 lines
6.5 KiB
HTML
<!doctype html>
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<title>CodeMirror: Common Lisp mode</title>
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<div id=nav>
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<a href="http://codemirror.net"><img id=logo src="../../doc/logo.png"></a>
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<ul>
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<li><a href="../../index.html">Home</a>
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<li><a href="https://github.com/marijnh/codemirror">Code</a>
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<li><a href="../index.html">Language modes</a>
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<li><a class=active href="#">Common Lisp</a>
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</ul>
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</div>
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<article>
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<h2>Common Lisp mode</h2>
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<form><textarea id="code" name="code">(in-package :cl-postgres)
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;; These are used to synthesize reader and writer names for integer
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;; reading/writing functions when the amount of bytes and the
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;; signedness is known. Both the macro that creates the functions and
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;; some macros that use them create names this way.
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(eval-when (:compile-toplevel :load-toplevel :execute)
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(defun integer-reader-name (bytes signed)
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(intern (with-standard-io-syntax
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(format nil "~a~a~a~a" '#:read- (if signed "" '#:u) '#:int bytes))))
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(defun integer-writer-name (bytes signed)
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(intern (with-standard-io-syntax
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(format nil "~a~a~a~a" '#:write- (if signed "" '#:u) '#:int bytes)))))
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(defmacro integer-reader (bytes)
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"Create a function to read integers from a binary stream."
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(let ((bits (* bytes 8)))
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(labels ((return-form (signed)
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(if signed
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`(if (logbitp ,(1- bits) result)
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(dpb result (byte ,(1- bits) 0) -1)
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result)
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`result))
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(generate-reader (signed)
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`(defun ,(integer-reader-name bytes signed) (socket)
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(declare (type stream socket)
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#.*optimize*)
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,(if (= bytes 1)
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`(let ((result (the (unsigned-byte 8) (read-byte socket))))
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(declare (type (unsigned-byte 8) result))
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,(return-form signed))
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`(let ((result 0))
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(declare (type (unsigned-byte ,bits) result))
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,@(loop :for byte :from (1- bytes) :downto 0
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:collect `(setf (ldb (byte 8 ,(* 8 byte)) result)
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(the (unsigned-byte 8) (read-byte socket))))
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,(return-form signed))))))
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`(progn
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;; This causes weird errors on SBCL in some circumstances. Disabled for now.
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;; (declaim (inline ,(integer-reader-name bytes t)
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;; ,(integer-reader-name bytes nil)))
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(declaim (ftype (function (t) (signed-byte ,bits))
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,(integer-reader-name bytes t)))
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,(generate-reader t)
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(declaim (ftype (function (t) (unsigned-byte ,bits))
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,(integer-reader-name bytes nil)))
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,(generate-reader nil)))))
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(defmacro integer-writer (bytes)
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"Create a function to write integers to a binary stream."
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(let ((bits (* 8 bytes)))
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`(progn
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(declaim (inline ,(integer-writer-name bytes t)
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,(integer-writer-name bytes nil)))
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(defun ,(integer-writer-name bytes nil) (socket value)
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(declare (type stream socket)
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(type (unsigned-byte ,bits) value)
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#.*optimize*)
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,@(if (= bytes 1)
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`((write-byte value socket))
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(loop :for byte :from (1- bytes) :downto 0
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:collect `(write-byte (ldb (byte 8 ,(* byte 8)) value)
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socket)))
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(values))
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(defun ,(integer-writer-name bytes t) (socket value)
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(declare (type stream socket)
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(type (signed-byte ,bits) value)
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#.*optimize*)
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,@(if (= bytes 1)
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`((write-byte (ldb (byte 8 0) value) socket))
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(loop :for byte :from (1- bytes) :downto 0
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:collect `(write-byte (ldb (byte 8 ,(* byte 8)) value)
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socket)))
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(values)))))
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;; All the instances of the above that we need.
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(integer-reader 1)
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(integer-reader 2)
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(integer-reader 4)
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(integer-reader 8)
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(integer-writer 1)
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(integer-writer 2)
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(integer-writer 4)
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(defun write-bytes (socket bytes)
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"Write a byte-array to a stream."
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(declare (type stream socket)
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(type (simple-array (unsigned-byte 8)) bytes)
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#.*optimize*)
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(write-sequence bytes socket))
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(defun write-str (socket string)
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"Write a null-terminated string to a stream \(encoding it when UTF-8
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support is enabled.)."
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(declare (type stream socket)
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(type string string)
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#.*optimize*)
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(enc-write-string string socket)
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(write-uint1 socket 0))
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(declaim (ftype (function (t unsigned-byte)
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(simple-array (unsigned-byte 8) (*)))
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read-bytes))
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(defun read-bytes (socket length)
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"Read a byte array of the given length from a stream."
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(declare (type stream socket)
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(type fixnum length)
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#.*optimize*)
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(let ((result (make-array length :element-type '(unsigned-byte 8))))
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(read-sequence result socket)
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result))
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(declaim (ftype (function (t) string) read-str))
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(defun read-str (socket)
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"Read a null-terminated string from a stream. Takes care of encoding
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when UTF-8 support is enabled."
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(declare (type stream socket)
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#.*optimize*)
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(enc-read-string socket :null-terminated t))
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(defun skip-bytes (socket length)
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"Skip a given number of bytes in a binary stream."
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(declare (type stream socket)
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(type (unsigned-byte 32) length)
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#.*optimize*)
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(dotimes (i length)
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(read-byte socket)))
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(defun skip-str (socket)
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"Skip a null-terminated string."
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(declare (type stream socket)
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#.*optimize*)
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(loop :for char :of-type fixnum = (read-byte socket)
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:until (zerop char)))
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(defun ensure-socket-is-closed (socket &key abort)
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(when (open-stream-p socket)
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(handler-case
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(close socket :abort abort)
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(error (error)
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(warn "Ignoring the error which happened while trying to close PostgreSQL socket: ~A" error)))))
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</textarea></form>
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<script>
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var editor = CodeMirror.fromTextArea(document.getElementById("code"), {lineNumbers: true});
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</script>
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<p><strong>MIME types defined:</strong> <code>text/x-common-lisp</code>.</p>
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</article>
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