SyntaxUtilities.java

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/*
 * SyntaxUtilities.java - Utility functions used by syntax colorizing
 * Copyright (C) 1999 Slava Pestov
 * Copyright (C) 2000-2023 The Gridarta Developers.
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */
 
package net.sf.gridarta.textedit.textarea;
 
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.text.Segment;
import javax.swing.text.TabExpander;
import javax.swing.text.Utilities;
import org.jetbrains.annotations.NotNull;
 
public class SyntaxUtilities {
 
    private SyntaxUtilities() {
    }
 
    public static boolean regionMatches(final boolean ignoreCase, final Segment text, final int offset, @NotNull final CharSequence match) {
        final int length = offset + match.length();
        final char[] textArray = text.array;
        if (length > text.offset + text.count) {
            return false;
        }
 
        for (int i = offset, j = 0; i < length; i++, j++) {
            char c1 = textArray[i];
            char c2 = match.charAt(j);
            if (ignoreCase) {
                c1 = Character.toUpperCase(c1);
                c2 = Character.toUpperCase(c2);
            }
            if (c1 != c2) {
                return false;
            }
        }
        return true;
    }
 
    @NotNull
    public static SyntaxStyles getDefaultSyntaxStyles() {
        final SyntaxStyle[] styles = new SyntaxStyle[Token.ID_COUNT];
 
        styles[Token.COMMENT1] = new SyntaxStyle(new Color(0x008000), true, false); // green comments
        styles[Token.COMMENT2] = new SyntaxStyle(new Color(0x990033), true, false);
        styles[Token.KEYWORD1] = new SyntaxStyle(Color.blue, false, true);
        styles[Token.KEYWORD2] = new SyntaxStyle(Color.magenta, false, false);
        styles[Token.KEYWORD3] = new SyntaxStyle(new Color(0x009600), false, false);
        styles[Token.LITERAL1] = new SyntaxStyle(new Color(0x650099), false, false);
        styles[Token.LITERAL2] = new SyntaxStyle(new Color(0x650099), false, true);
        styles[Token.LABEL] = new SyntaxStyle(new Color(0x990033), false, true);
        styles[Token.OPERATOR] = new SyntaxStyle(Color.black, false, true);
        styles[Token.INVALID] = new SyntaxStyle(Color.red, false, true);
 
        return new SyntaxStyles(styles);
    }
 
    public static int paintSyntaxLine(@NotNull final Segment line, @NotNull final Iterable<Token> tokens, @NotNull final SyntaxStyles styles, @NotNull final TabExpander expander, @NotNull final Graphics gfx, final int x, final int y) {
        final Font defaultFont = gfx.getFont();
        final Color defaultColor = gfx.getColor();
 
        int xPos = x;
        for (final Token token : tokens) {
            final byte id = token.getId();
 
            final int length = token.getLength();
            if (id == Token.NULL) {
                if (!defaultColor.equals(gfx.getColor())) {
                    gfx.setColor(defaultColor);
                }
                if (!defaultFont.equals(gfx.getFont())) {
                    gfx.setFont(defaultFont);
                }
            } else {
                styles.getStyle(id).setGraphicsFlags(gfx, defaultFont);
            }
 
            line.count = length;
            xPos = Utilities.drawTabbedText(line, xPos, y, gfx, expander, 0);
            line.offset += length;
        }
 
        return xPos;
    }
 
}