// 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.
package prettify.lang;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;
import prettify.parser.Prettify;

/**
 * This is similar to the lang-lisp.js in JavaScript Prettify.
 * 
 * All comments are adapted from the JavaScript Prettify.
 * 
 * <p>
 * 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
 *     lang-lsp - FAT 8.3 filename version of lang-lisp.
 *
 *
 * 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
 */
public class LangLisp extends Lang {

  public LangLisp() {
    List<List<Object>> _shortcutStylePatterns = new ArrayList<List<Object>>();
    List<List<Object>> _fallthroughStylePatterns = new ArrayList<List<Object>>();

    _shortcutStylePatterns.add(Arrays.asList(new Object[]{"opn", Pattern.compile("^\\(+"), null, "("}));
    _shortcutStylePatterns.add(Arrays.asList(new Object[]{"clo", Pattern.compile("^\\)+"), null, ")"}));
    // A line comment that starts with ;
    _shortcutStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_COMMENT, Pattern.compile("^;[^\r\n]*"), null, ";"}));
    // Whitespace
    _shortcutStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PLAIN, Pattern.compile("^[\t\n\r \\xA0]+"), null, "\t\n\r " + Character.toString((char) 0xA0)}));
    // A double quoted, possibly multi-line, string.
    _shortcutStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_STRING, Pattern.compile("^\\\"(?:[^\\\"\\\\]|\\\\[\\s\\S])*(?:\\\"|$)"), null, "\""}));
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_KEYWORD, Pattern.compile("^(?:block|c[ad]+r|catch|con[ds]|def(?:ine|un)|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", Pattern.CASE_INSENSITIVE), null}));
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^[+\\-]?(?:[0#]x[0-9a-f]+|\\d+\\/\\d+|(?:\\.\\d+|\\d+(?:\\.\\d*)?)(?:[ed][+\\-]?\\d+)?)", Pattern.CASE_INSENSITIVE)}));
    // A single quote possibly followed by a word that optionally ends with
    // = ! or ?.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^\\'(?:-*(?:\\w|\\\\[\\x21-\\x7e])(?:[\\w-]*|\\\\[\\x21-\\x7e])[=!?]?)?")}));
    // A word that optionally ends with = ! or ?.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PLAIN, Pattern.compile("^-*(?:[a-z_]|\\\\[\\x21-\\x7e])(?:[\\w-]*|\\\\[\\x21-\\x7e])[=!?]?", Pattern.CASE_INSENSITIVE)}));
    // A printable non-space non-special character
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PUNCTUATION, Pattern.compile("^[^\\w\\t\\n\\r \\xA0()\\\"\\\\\\';]+")}));

    setShortcutStylePatterns(_shortcutStylePatterns);
    setFallthroughStylePatterns(_fallthroughStylePatterns);
  }

  public static List<String> getFileExtensions() {
    return Arrays.asList(new String[]{"cl", "el", "lisp", "lsp", "scm"});
  }
}