dorkbox.console.output.HtmlAnsiOutputStream Maven / Gradle / Ivy

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Java unbuffered input and ANSI output support in consoles for linux, mac, windows.
There is a newer version: 4.1
/*
 * Copyright 2016 dorkbox, llc
 *
 * 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.
 *
 *
 * Copyright (C) 2009, Progress Software Corporation and/or its
 * subsidiaries or affiliates.  All rights reserved.
 * 
 * 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 asValue 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 dorkbox.console.output;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * @author dorkbox, llc
 * @author Daniel Doubrovkine
 */
public
class HtmlAnsiOutputStream extends AnsiOutputStream {

    private static final String ANSI_COLOR_MAP[];

    static {
        ANSI_COLOR_MAP = new String[8];
        ANSI_COLOR_MAP[BLACK]   = "black";
        ANSI_COLOR_MAP[RED]     = "red";
        ANSI_COLOR_MAP[GREEN]   = "green";
        ANSI_COLOR_MAP[YELLOW]  = "yellow";
        ANSI_COLOR_MAP[BLUE]    = "blue";
        ANSI_COLOR_MAP[MAGENTA] = "magenta";
        ANSI_COLOR_MAP[CYAN]    = "cyan";
        ANSI_COLOR_MAP[WHITE]   = "white";
    }

    private static final byte[] BYTES_QUOT = """.getBytes();
    private static final byte[] BYTES_AMP = "&".getBytes();
    private static final byte[] BYTES_LT = "<".getBytes();
    private static final byte[] BYTES_GT = ">".getBytes();

    private boolean concealOn = false;
    private List closingAttributes = new ArrayList();

    public
    HtmlAnsiOutputStream(OutputStream os) {
        super(os);
    }

    private
    void write(String s) throws IOException {
        super.out.write(s.getBytes());
    }

    private
    void writeAttribute(String s) throws IOException {
        write("<" + s + ">");
        closingAttributes.add(0, s.split(" ", 2)[0]);
    }

    private
    void closeAttributes() throws IOException {
        for (String attr : closingAttributes) {
            write("");
        }
        closingAttributes.clear();
    }

    public
    void write(int data) throws IOException {
        switch (data) {
            case 34: // "
                out.write(BYTES_QUOT);
                break;
            case 38: // &
                out.write(BYTES_AMP);
                break;
            case 60: // <
                out.write(BYTES_LT);
                break;
            case 62: // >
                out.write(BYTES_GT);
                break;
            default:
                super.write(data);
        }
    }

    @Override
    protected
    void processSetAttribute(int attribute) throws IOException {
        switch (attribute) {
            case ATTRIBUTE_CONCEAL_ON:
                write("\u001B[8m");
                concealOn = true;
                break;
            case ATTRIBUTE_BOLD:
                writeAttribute("b");
                break;
            case ATTRIBUTE_NORMAL:
                closeAttributes();
                break;
            case ATTRIBUTE_UNDERLINE:
                writeAttribute("u");
                break;
            case  ATTRIBUTE_UNDERLINE_OFF:
                closeAttributes();
                break;
            case ATTRIBUTE_NEGATIVE_ON:
                break;
            case ATTRIBUTE_NEGATIVE_OFF:
                break;
        }
    }

    @Override
    protected
    void processSetForegroundColor(final int color) throws IOException {
        writeAttribute("span style=\"color: " + ANSI_COLOR_MAP[color] + ";\"");
    }

    @Override
    protected
    void processSetBackgroundColor(final int color) throws IOException {
        writeAttribute("span style=\"background-color: " + ANSI_COLOR_MAP[color] + ";\"");
    }

    @Override
    protected
    void processAttributeReset() throws IOException {
        if (concealOn) {
            write("\u001B[0m");
            concealOn = false;
        }
        closeAttributes();
    }

    @Override
    public
    void close() throws IOException {
        closeAttributes();
        super.close();
    }

    public
    void writeLine(final byte[] buf, final int offset, final int len) throws IOException {
        write(buf, offset, len);
        closeAttributes();
    }
}