Add prettify/lang-lisp.js from the Google Code Prettifier.

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diff --git a/prettify/lang-lisp.js b/prettify/lang-lisp.js
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+// Copyright (C) 2008 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+
+/**
+ * @fileoverview
+ * Registers a language handler for Common Lisp and related languages.
+ *
+ *
+ * To use, include prettify.js and this file in your HTML page.
+ * Then put your code in an HTML tag like
+ *      <pre class="prettyprint lang-lisp">(my lisp code)</pre>
+ * The lang-cl class identifies the language as common lisp.
+ * This file supports the following language extensions:
+ *     lang-cl - Common Lisp
+ *     lang-el - Emacs Lisp
+ *     lang-lisp - Lisp
+ *     lang-scm - Scheme
+ *
+ *
+ * I used http://www.devincook.com/goldparser/doc/meta-language/grammar-LISP.htm
+ * as the basis, but added line comments that start with ; and changed the atom
+ * production to disallow unquoted semicolons.
+ *
+ * "Name"    = 'LISP'
+ * "Author"  = 'John McCarthy'
+ * "Version" = 'Minimal'
+ * "About"   = 'LISP is an abstract language that organizes ALL'
+ *           | 'data around "lists".'
+ *
+ * "Start Symbol" = [s-Expression]
+ *
+ * {Atom Char}   = {Printable} - {Whitespace} - [()"\'']
+ *
+ * Atom = ( {Atom Char} | '\'{Printable} )+
+ *
+ * [s-Expression] ::= [Quote] Atom
+ *                  | [Quote] '(' [Series] ')'
+ *                  | [Quote] '(' [s-Expression] '.' [s-Expression] ')'
+ *
+ * [Series] ::= [s-Expression] [Series]
+ *            |
+ *
+ * [Quote]  ::= ''      !Quote = do not evaluate
+ *            |
+ *
+ *
+ * I used <a href="http://gigamonkeys.com/book/">Practical Common Lisp</a> as
+ * the basis for the reserved word list.
+ *
+ *
+ * @author mikesamuel@gmail.com
+ */
+
+PR.registerLangHandler(
+    PR.createSimpleLexer(
+        [
+         ['opn',             /^\(/, null, '('],
+         ['clo',             /^\)/, null, ')'],
+         // A line comment that starts with ;
+         [PR.PR_COMMENT,     /^;[^\r\n]*/, null, ';'],
+         // Whitespace
+         [PR.PR_PLAIN,       /^[\t\n\r \xA0]+/, null, '\t\n\r \xA0'],
+         // A double quoted, possibly multi-line, string.
+         [PR.PR_STRING,      /^\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)/, null, '"']
+        ],
+        [
+         [PR.PR_KEYWORD,     /^(?:block|c[ad]+r|catch|cons|defun|do|eq|eql|equal|equalp|eval-when|flet|format|go|if|labels|lambda|let|load-time-value|locally|macrolet|multiple-value-call|nil|progn|progv|quote|require|return-from|setq|symbol-macrolet|t|tagbody|the|throw|unwind)\b/, null],
+         [PR.PR_LITERAL,
+          /^[+\-]?(?:0x[0-9a-f]+|\d+\/\d+|(?:\.\d+|\d+(?:\.\d*)?)(?:[ed][+\-]?\d+)?)/i],
+         // A single quote possibly followed by a word that optionally ends with
+         // = ! or ?.
+         [PR.PR_LITERAL,
+          /^\'(?:-*(?:\w|\\[\x21-\x7e])(?:[\w-]*|\\[\x21-\x7e])[=!?]?)?/],
+         // A word that optionally ends with = ! or ?.
+         [PR.PR_PLAIN,
+          /^-*(?:[a-z_]|\\[\x21-\x7e])(?:[\w-]*|\\[\x21-\x7e])[=!?]?/i],
+         // A printable non-space non-special character
+         [PR.PR_PUNCTUATION, /^[^\w\t\n\r \xA0()\"\\\';]+/]
+        ]),
+    ['cl', 'el', 'lisp', 'scm']);