// Copyright (C) 2010 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.Lang;
import prettify.Prettify;

/**
 * This is similar to the lang-scala.js in JavaScript Prettify.
 * 
 * All comments are adapted from the JavaScript Prettify.
 * 
 * <p>
 * Registers a language handler for Scala.
 *
 * Derived from http://lampsvn.epfl.ch/svn-repos/scala/scala-documentation/trunk/src/reference/SyntaxSummary.tex
 *
 * @author mikesamuel@gmail.com
 */
public class LangScala extends Lang {

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

        // 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 or single quoted string 
        // or a triple double-quoted multi-line string.
        _shortcutStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_STRING, Pattern.compile("^(?:\"(?:(?:\"\"(?:\"\"?(?!\")|[^\\\\\"]|\\\\.)*\"{0,3})|(?:[^\"\\r\\n\\\\]|\\\\.)*\"?))"), null, "\""}));
        _shortcutStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^`(?:[^\\r\\n\\\\`]|\\\\.)*`?"), null, "`"}));
        _shortcutStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PUNCTUATION, Pattern.compile("^[!#%&()*+,\\-:;<=>?@\\[\\\\\\]^{|}~]+"), null, "!#%&()*+,-:;<=>?@[\\\\]^{|}~"}));
        // A symbol literal is a single quote followed by an identifier with no
        // single quote following
        // A character literal has single quotes on either side
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_STRING, Pattern.compile("^'(?:[^\\r\\n\\\\']|\\\\(?:'|[^\\r\\n']+))'")}));
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^'[a-zA-Z_$][\\w$]*(?!['$\\w])")}));
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_KEYWORD, Pattern.compile("^(?:abstract|case|catch|class|def|do|else|extends|final|finally|for|forSome|if|implicit|import|lazy|match|new|object|override|package|private|protected|requires|return|sealed|super|throw|trait|try|type|val|var|while|with|yield)\\b")}));
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^(?:true|false|null|this)\\b")}));
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^(?:(?:0(?:[0-7]+|X[0-9A-F]+))L?|(?:(?:0|[1-9][0-9]*)(?:(?:\\.[0-9]+)?(?:E[+\\-]?[0-9]+)?F?|L?))|\\\\.[0-9]+(?:E[+\\-]?[0-9]+)?F?)", Pattern.CASE_INSENSITIVE)}));
        // Treat upper camel case identifiers as types.
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_TYPE, Pattern.compile("^[$_]*[A-Z][_$A-Z0-9]*[a-z][\\w$]*")}));
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PLAIN, Pattern.compile("^[$a-zA-Z_][\\w$]*")}));
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_COMMENT, Pattern.compile("^\\/(?:\\/.*|\\*(?:\\/|\\**[^*/])*(?:\\*+\\/?)?)")}));
        _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PUNCTUATION, Pattern.compile("^(?:\\.+|\\/)")}));

        setShortcutStylePatterns(_shortcutStylePatterns);
        setFallthroughStylePatterns(_fallthroughStylePatterns);
    }

    public static List<String> getFileExtensions() {
        return Arrays.asList(new String[]{"scala"});
    }
}