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/*
* libbrlapi - A library providing access to braille terminals for applications.
*
* Copyright (C) 2006-2025 by
* Samuel Thibault <Samuel.Thibault@ens-lyon.org>
* Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>
*
* libbrlapi comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
package org.a11y.brlapi;
import java.util.Map;
import java.util.HashMap;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public abstract class Strings {
private Strings () {
}
public static boolean isAbbreviation (String actual, String supplied) {
int count = supplied.length();
if (count == 0) return false;
if (count > actual.length()) return false;
return actual.regionMatches(true, 0, supplied, 0, count);
}
private final static Map<String, Pattern> patternCache = new HashMap<>();
public static Pattern getPattern (String expression) {
synchronized (patternCache) {
return patternCache.computeIfAbsent(expression, Pattern::compile);
}
}
public static Matcher getMatcher (String expression, String text) {
return getPattern(expression).matcher(text);
}
public static String replaceAll (String text, String expression, String replacement) {
return getMatcher(expression, text).replaceAll(replacement);
}
public static String wordify (String string) {
string = replaceAll(string, "^\\s*(.*?)\\s*$", "$1");
if (!string.isEmpty()) {
string = replaceAll(string, "(?<=.)(?=\\p{Upper})", " ");
string = replaceAll(string, "\\s+", " ");
}
return string;
}
public static int findNonemptyLine (CharSequence text) {
int length = text.length();
int at = 0;
for (int index=0; index<length; index+=1) {
char character = text.charAt(index);
if (character == '\n') {
at = index + 1;
} else if (!Character.isWhitespace(character)) {
break;
}
}
return at;
}
public static int findTrailingWhitespace (CharSequence text) {
int index = text.length();
while (--index >= 0) {
if (!Character.isWhitespace(text.charAt(index))) break;
}
return index + 1;
}
public static String removeTrailingWhitespace (String text) {
return text.substring(0, findTrailingWhitespace(text));
}
public static String compressWhitespace (String text) {
text = removeTrailingWhitespace(text);
if (!text.isEmpty()) text = replaceAll(text, "(?<=\\S)\\s+", " ");
return text;
}
public static String compressEmptyLines (String text) {
return replaceAll(text, "\n{2,}", "\n\n");
}
public static String formatParagraphs (String text, int width) {
StringBuilder result = new StringBuilder();
int length = text.length();
int from = 0;
while (from < length) {
int to = text.indexOf('\n', from);
if (to < 0) to = length;
String line = compressWhitespace(text.substring(from, to));
if (!line.isEmpty()) {
if (!Character.isWhitespace(line.charAt(0))) {
if (result.length() > 0) result.append('\n');
while (line.length() > width) {
int end = line.lastIndexOf(' ', width);
if (end < 0) {
end = line.indexOf(' ', width);
if (end < 0) break;
}
result.append(line.substring(0, end)).append('\n');
line = line.substring(end+1);
}
}
result.append(line);
}
result.append('\n');
from = to + 1;
}
result.setLength(findTrailingWhitespace(result));
result.delete(0, findNonemptyLine(result));
return compressEmptyLines(result.toString());
}
public static String formatParagraphs (String text) {
return formatParagraphs(text, 72);
}
}
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