src/prettify/lang/LangDart.java

/**
 * @license Copyright (C) 2013 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-dart.js in JavaScript Prettify.
 * 
 * All comments are adapted from the JavaScript Prettify.
 * 
 * <p>
 * Registers a language handler for Dart.
 *
 *
 * Loosely structured based on the DartLexer in Pygments: http://pygments.org/.
 *
 * 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-dart">(Dart code)</pre>
 *
 * @author armstrong.timothy@gmail.com
 */
public class LangDart extends Lang {

  public LangDart() {
    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)}));

    // Script tag.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_COMMENT, Pattern.compile("^#!(?:.*)")}));
    // `import`, `library`, `part of`, `part`, `as`, `show`, and `hide`
    // keywords.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_KEYWORD, Pattern.compile("^\\b(?:import|library|part of|part|as|show|hide)\\b", Pattern.CASE_INSENSITIVE)}));
    // Single-line comments.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_COMMENT, Pattern.compile("^\\/\\/(?:.*)")}));
    // Multiline comments.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_COMMENT, Pattern.compile("^\\/\\*[^*]*\\*+(?:[^\\/*][^*]*\\*+)*\\/")}));
    // `class` and `interface` keywords.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_KEYWORD, Pattern.compile("^\\b(?:class|interface)\\b", Pattern.CASE_INSENSITIVE)}));
    // General keywords.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_KEYWORD, Pattern.compile("^\\b(?:assert|break|case|catch|continue|default|do|else|finally|for|if|in|is|new|return|super|switch|this|throw|try|while)\\b", Pattern.CASE_INSENSITIVE)}));
    // Declaration keywords.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_KEYWORD, Pattern.compile("^\\b(?:abstract|const|extends|factory|final|get|implements|native|operator|set|static|typedef|var)\\b", Pattern.CASE_INSENSITIVE)}));
    // Keywords for types.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_TYPE, Pattern.compile("^\\b(?:bool|double|Dynamic|int|num|Object|String|void)\\b", Pattern.CASE_INSENSITIVE)}));
    // Keywords for constants.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_KEYWORD, Pattern.compile("\\b(?:false|null|true)\\b", Pattern.CASE_INSENSITIVE)}));
    // Multiline strings, single- and double-quoted.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_STRING, Pattern.compile("^r?[\\']{3}[\\s|\\S]*?[^\\\\][\\']{3}")}));
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_STRING, Pattern.compile("^r?[\\\"]{3}[\\s|\\S]*?[^\\\\][\\\"]{3}")}));
    // Normal and raw strings, single- and double-quoted.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_STRING, Pattern.compile("^r?\\'(\\'|(?:[^\\n\\r\\f])*?[^\\\\]\\')")}));
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_STRING, Pattern.compile("^r?\\\"(\\\"|(?:[^\\n\\r\\f])*?[^\\\\]\\\")")}));
    // Identifiers.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PLAIN, Pattern.compile("^[a-z_$][a-z0-9_]*", Pattern.CASE_INSENSITIVE)}));
    // Operators.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_PUNCTUATION, Pattern.compile("^[~!%^&*+=|?:<>/-]")}));
    // Hex numbers.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^\\b0x[0-9a-f]+", Pattern.CASE_INSENSITIVE)}));
    // Decimal numbers.
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^\\b\\d+(?:\\.\\d*)?(?:e[+-]?\\d+)?", Pattern.CASE_INSENSITIVE)}));
    _fallthroughStylePatterns.add(Arrays.asList(new Object[]{Prettify.PR_LITERAL, Pattern.compile("^\\b\\.\\d+(?:e[+-]?\\d+)?", Pattern.CASE_INSENSITIVE)}));
      // Punctuation.
    _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[]{"dart"});
  }
}