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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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