src/jexer/teditor/Highlighter.java

   1 /*
   2  * Jexer - Java Text User Interface
   3  *
   4  * The MIT License (MIT)
   5  *
   6  * Copyright (C) 2019 Kevin Lamonte
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  *
  26  * @author Kevin Lamonte [kevin.lamonte@gmail.com]
  27  * @version 1
  28  */
  29 package jexer.teditor;
  30
  31 import java.util.SortedMap;
  32 import java.util.TreeMap;
  33
  34 import jexer.bits.CellAttributes;
  35 import jexer.bits.Color;
  36
  37 /**
  38  * Highlighter provides color choices for certain text strings.
  39  */
  40 public class Highlighter {
  41
  42     // ------------------------------------------------------------------------
  43     // Variables --------------------------------------------------------------
  44     // ------------------------------------------------------------------------
  45
  46     /**
  47      * The highlighter colors.
  48      */
  49     private SortedMap<String, CellAttributes> colors;
  50
  51     // ------------------------------------------------------------------------
  52     // Constructors -----------------------------------------------------------
  53     // ------------------------------------------------------------------------
  54
  55     /**
  56      * Public constructor sets the theme to the default.
  57      */
  58     public Highlighter() {
  59         colors = new TreeMap<String, CellAttributes>();
  60     }
  61
  62     // ------------------------------------------------------------------------
  63     // Highlighter ------------------------------------------------------------
  64     // ------------------------------------------------------------------------
  65
  66     /**
  67      * See if this is a character that should split a word.
  68      *
  69      * @param ch the character
  70      * @return true if the word should be split
  71      */
  72     public boolean shouldSplit(final int ch) {
  73         // For now, split on punctuation
  74         String punctuation = "'\"\\<>{}[]!@#$%^&*();:.,-+/*?";
  75         if (ch < 0x100) {
  76             if (punctuation.indexOf((char) ch) != -1) {
  77                 return true;
  78             }
  79         }
  80         return false;
  81     }
  82
  83     /**
  84      * Retrieve the CellAttributes for a named theme color.
  85      *
  86      * @param name theme color name, e.g. "twindow.border"
  87      * @return color associated with name, e.g. bold yellow on blue
  88      */
  89     public CellAttributes getColor(final String name) {
  90         CellAttributes attr = (CellAttributes) colors.get(name);
  91         return attr;
  92     }
  93
  94     /**
  95      * Sets to defaults that resemble the Borland IDE colors.
  96      */
  97     public void setJavaColors() {
  98         CellAttributes color;
  99
 100         String [] keywords = {
 101             "boolean", "byte", "short", "int", "long", "char", "float",
 102             "double", "void", "new",
 103             "static", "final", "volatile", "synchronized", "abstract",
 104             "public", "private", "protected",
 105             "class", "interface", "extends", "implements",
 106             "if", "else", "do", "while", "for", "break", "continue",
 107             "switch", "case", "default",
 108         };
 109         color = new CellAttributes();
 110         color.setForeColor(Color.WHITE);
 111         color.setBackColor(Color.BLUE);
 112         color.setBold(true);
 113         for (String str: keywords) {
 114             colors.put(str, color);
 115         }
 116
 117         String [] operators = {
 118             "[", "]", "(", ")", "{", "}",
 119             "*", "-", "+", "/", "=", "%",
 120             "^", "&", "!", "<<", ">>", "<<<", ">>>",
 121             "&&", "||",
 122             ">", "<", ">=", "<=", "!=", "==",
 123             ",", ";", ".", "?", ":",
 124         };
 125         color = new CellAttributes();
 126         color.setForeColor(Color.CYAN);
 127         color.setBackColor(Color.BLUE);
 128         color.setBold(true);
 129         for (String str: operators) {
 130             colors.put(str, color);
 131         }
 132
 133         String [] packageKeywords = {
 134             "package", "import",
 135         };
 136         color = new CellAttributes();
 137         color.setForeColor(Color.GREEN);
 138         color.setBackColor(Color.BLUE);
 139         color.setBold(true);
 140         for (String str: packageKeywords) {
 141             colors.put(str, color);
 142         }
 143
 144     }
 145
 146 }