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Bring back the AnsiRenderer, fixes #184
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/* | ||
* Copyright (C) 2009-2021 the original author(s). | ||
* | ||
* 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 org.fusesource.jansi; | ||
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import java.io.IOException; | ||
import java.util.Locale; | ||
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import org.fusesource.jansi.Ansi.Attribute; | ||
import org.fusesource.jansi.Ansi.Color; | ||
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/** | ||
* Renders ANSI color escape-codes in strings by parsing out some special syntax to pick up the correct fluff to use. | ||
* | ||
* The syntax for embedded ANSI codes is: | ||
* | ||
* <pre> | ||
* @|<em>code</em>(,<em>code</em>)* <em>text</em>|@ | ||
* </pre> | ||
* | ||
* Examples: | ||
* | ||
* <pre> | ||
* @|bold Hello|@ | ||
* </pre> | ||
* | ||
* <pre> | ||
* @|bold,red Warning!|@ | ||
* </pre> | ||
* | ||
* @since 2.2 | ||
*/ | ||
public class AnsiRenderer { | ||
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public static final String BEGIN_TOKEN = "@|"; | ||
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public static final String END_TOKEN = "|@"; | ||
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public static final String CODE_TEXT_SEPARATOR = " "; | ||
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public static final String CODE_LIST_SEPARATOR = ","; | ||
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private static final int BEGIN_TOKEN_LEN = 2; | ||
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private static final int END_TOKEN_LEN = 2; | ||
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public static String render(final String input) throws IllegalArgumentException { | ||
try { | ||
return render(input, new StringBuilder()).toString(); | ||
} catch (IOException e) { | ||
// Cannot happen because StringBuilder does not throw IOException | ||
throw new IllegalArgumentException(e); | ||
} | ||
} | ||
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/** | ||
* Renders the given input to the target Appendable. | ||
* | ||
* @param input | ||
* source to render | ||
* @param target | ||
* render onto this target Appendable. | ||
* @return the given Appendable | ||
* @throws IOException | ||
* If an I/O error occurs | ||
*/ | ||
public static Appendable render(final String input, Appendable target) throws IOException { | ||
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int i = 0; | ||
int j, k; | ||
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while (true) { | ||
j = input.indexOf(BEGIN_TOKEN, i); | ||
if (j == -1) { | ||
if (i == 0) { | ||
target.append(input); | ||
return target; | ||
} | ||
target.append(input.substring(i)); | ||
return target; | ||
} | ||
target.append(input.substring(i, j)); | ||
k = input.indexOf(END_TOKEN, j); | ||
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if (k == -1) { | ||
target.append(input); | ||
return target; | ||
} | ||
j += BEGIN_TOKEN_LEN; | ||
String spec = input.substring(j, k); | ||
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String[] items = spec.split(CODE_TEXT_SEPARATOR, 2); | ||
if (items.length == 1) { | ||
target.append(input); | ||
return target; | ||
} | ||
String replacement = render(items[1], items[0].split(CODE_LIST_SEPARATOR)); | ||
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target.append(replacement); | ||
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i = k + END_TOKEN_LEN; | ||
} | ||
} | ||
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public static String render(final String text, final String... codes) { | ||
return render(Ansi.ansi(), codes) | ||
.a(text).reset().toString(); | ||
} | ||
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/** | ||
* Renders {@link Code} names as an ANSI escape string. | ||
* @param codes The code names to render | ||
* @return an ANSI escape string. | ||
*/ | ||
public static String renderCodes(final String... codes) { | ||
return render(Ansi.ansi(), codes).toString(); | ||
} | ||
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/** | ||
* Renders {@link Code} names as an ANSI escape string. | ||
* @param codes A space separated list of code names to render | ||
* @return an ANSI escape string. | ||
*/ | ||
public static String renderCodes(final String codes) { | ||
return renderCodes(codes.split("\\s")); | ||
} | ||
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private static Ansi render(Ansi ansi, String... names) { | ||
for (String name : names) { | ||
Code code = Code.valueOf(name.toUpperCase(Locale.ENGLISH)); | ||
if (code.isColor()) { | ||
if (code.isBackground()) { | ||
ansi.bg(code.getColor()); | ||
} else { | ||
ansi.fg(code.getColor()); | ||
} | ||
} else if (code.isAttribute()) { | ||
ansi.a(code.getAttribute()); | ||
} | ||
} | ||
return ansi; | ||
} | ||
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public static boolean test(final String text) { | ||
return text != null && text.contains(BEGIN_TOKEN); | ||
} | ||
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@SuppressWarnings("unused") | ||
public enum Code { | ||
// | ||
// TODO: Find a better way to keep Code in sync with Color/Attribute/Erase | ||
// | ||
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// Colors | ||
BLACK(Color.BLACK), | ||
RED(Color.RED), | ||
GREEN(Color.GREEN), | ||
YELLOW(Color.YELLOW), | ||
BLUE(Color.BLUE), | ||
MAGENTA(Color.MAGENTA), | ||
CYAN(Color.CYAN), | ||
WHITE(Color.WHITE), | ||
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// Foreground Colors | ||
FG_BLACK(Color.BLACK, false), | ||
FG_RED(Color.RED, false), | ||
FG_GREEN(Color.GREEN, false), | ||
FG_YELLOW(Color.YELLOW, false), | ||
FG_BLUE(Color.BLUE, false), | ||
FG_MAGENTA(Color.MAGENTA, false), | ||
FG_CYAN(Color.CYAN, false), | ||
FG_WHITE(Color.WHITE, false), | ||
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// Background Colors | ||
BG_BLACK(Color.BLACK, true), | ||
BG_RED(Color.RED, true), | ||
BG_GREEN(Color.GREEN, true), | ||
BG_YELLOW(Color.YELLOW, true), | ||
BG_BLUE(Color.BLUE, true), | ||
BG_MAGENTA(Color.MAGENTA, true), | ||
BG_CYAN(Color.CYAN, true), | ||
BG_WHITE(Color.WHITE, true), | ||
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// Attributes | ||
RESET(Attribute.RESET), | ||
INTENSITY_BOLD(Attribute.INTENSITY_BOLD), | ||
INTENSITY_FAINT(Attribute.INTENSITY_FAINT), | ||
ITALIC(Attribute.ITALIC), | ||
UNDERLINE(Attribute.UNDERLINE), | ||
BLINK_SLOW(Attribute.BLINK_SLOW), | ||
BLINK_FAST(Attribute.BLINK_FAST), | ||
BLINK_OFF(Attribute.BLINK_OFF), | ||
NEGATIVE_ON(Attribute.NEGATIVE_ON), | ||
NEGATIVE_OFF(Attribute.NEGATIVE_OFF), | ||
CONCEAL_ON(Attribute.CONCEAL_ON), | ||
CONCEAL_OFF(Attribute.CONCEAL_OFF), | ||
UNDERLINE_DOUBLE(Attribute.UNDERLINE_DOUBLE), | ||
UNDERLINE_OFF(Attribute.UNDERLINE_OFF), | ||
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// Aliases | ||
BOLD(Attribute.INTENSITY_BOLD), | ||
FAINT(Attribute.INTENSITY_FAINT),; | ||
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private final Enum<?> n; | ||
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private final boolean background; | ||
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Code(final Enum<?> n, boolean background) { | ||
this.n = n; | ||
this.background = background; | ||
} | ||
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Code(final Enum<?> n) { | ||
this(n, false); | ||
} | ||
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public boolean isColor() { | ||
return n instanceof Ansi.Color; | ||
} | ||
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public Ansi.Color getColor() { | ||
return (Ansi.Color) n; | ||
} | ||
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public boolean isAttribute() { | ||
return n instanceof Attribute; | ||
} | ||
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public Attribute getAttribute() { | ||
return (Attribute) n; | ||
} | ||
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public boolean isBackground() { | ||
return background; | ||
} | ||
} | ||
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private AnsiRenderer() { | ||
} | ||
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} |
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