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<title>CodeMirror: Common Lisp mode</title>

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<a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>

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<ul>

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<li><a href="../../doc/manual.html">Manual</a>

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</ul>

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<ul>

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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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<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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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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