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package aQute.lib.strings;
import static java.util.stream.Collectors.toList;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.StringJoiner;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collector;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import aQute.lib.hex.Hex;
import aQute.libg.qtokens.QuotedTokenizer;
public class Strings {
private static final String COMMA = ",";
public static String join(String middle, Iterable objects) {
if (objects == null) {
return "";
}
return StreamSupport.stream(objects.spliterator(), false)
.filter(Objects::nonNull)
.map(Object::toString)
.collect(Collectors.joining(middle));
}
public static String join(Iterable objects) {
return join(COMMA, objects);
}
public static String join(String middle, Iterable objects, Pattern pattern, String replace) {
if (pattern == null) {
return join(middle, objects);
}
StringBuilder sb = new StringBuilder();
join(sb, middle, objects, pattern, replace);
return sb.toString();
}
public static void join(StringBuilder sb, String middle, Iterable objects, Pattern pattern, String replace) {
if (objects == null) {
return;
}
String del = "";
for (Object o : objects) {
if (o != null) {
sb.append(del);
String s = o.toString();
if (pattern != null) {
Matcher matcher = pattern.matcher(s);
if (!matcher.matches())
continue;
s = matcher.replaceAll(replace);
}
sb.append(s);
del = middle;
}
}
}
public static String join(String middle, Object[] segments) {
return join(middle, Arrays.asList(segments));
}
public static Collector joining() {
return Collectors.joining(COMMA);
}
public static Collector joining(CharSequence delimiter, CharSequence prefix,
CharSequence suffix, CharSequence emptyValue) {
Function finisher = (emptyValue != null) ? joiner -> joiner.setEmptyValue(emptyValue)
.toString() : joiner -> {
String emptyMarker = new String();
String joined = joiner.setEmptyValue(emptyMarker)
.toString();
return (joined != emptyMarker) ? joined : null;
};
return Collector.of(() -> new StringJoiner(delimiter, prefix, suffix), StringJoiner::add, StringJoiner::merge,
finisher);
}
public static String display(Object o, Object... ifNull) {
if (o != null)
return o.toString();
for (int i = 0; i < ifNull.length; i++) {
if (ifNull[i] != null)
return ifNull[i].toString();
}
return "";
}
public static String join(String[] strings) {
return join(Arrays.asList(strings));
}
public static String join(Object[] strings) {
return join(Arrays.asList(strings));
}
public static String getLastSegment(String name, char c) {
return name.substring(name.lastIndexOf(c) + 1);
}
public static String getLastSegment(String name) {
return getLastSegment(name, '.');
}
public static String trim(String s) {
if (s == null)
return null;
if (s.isEmpty())
return s;
int start = 0;
while (start < s.length() && Character.isWhitespace(s.charAt(start)))
start++;
int end = s.length();
while (end > start && Character.isWhitespace(s.charAt(end - 1)))
end--;
if (start == 0 && end == s.length())
return s;
return s.substring(start, end);
}
public static boolean notEmpty(String s) {
return !s.isEmpty();
}
public static boolean nonNullOrEmpty(String s) {
return (s != null) && !s.isEmpty();
}
public static boolean nonNullOrTrimmedEmpty(String s) {
return (s != null) && !s.trim()
.isEmpty();
}
private final static Pattern SIMPLE_LIST_SPLITTER = Pattern.compile("\\s*,\\s*");
public static Stream splitAsStream(String s) {
return splitAsStream(s, SIMPLE_LIST_SPLITTER);
}
public static Stream splitAsStream(String s, Pattern splitter) {
if ((s == null) || (s = s.trim()).isEmpty()) {
return Stream.empty();
}
return splitter.splitAsStream(s)
.filter(Strings::notEmpty);
}
public static List split(String s) {
return splitAsStream(s).collect(toList());
}
public static List split(String s, Pattern splitter) {
return splitAsStream(s, splitter).collect(toList());
}
public static Stream splitQuotedAsStream(String s) {
return splitQuotedAsStream(s, true);
}
public static Stream splitQuotedAsStream(String s, String separators) {
return splitQuotedAsStream(s, separators, true);
}
public static Stream splitQuotedAsStream(String s, boolean retainQuotes) {
return splitQuotedAsStream(s, COMMA, retainQuotes);
}
public static Stream splitQuotedAsStream(String s, String separators, boolean retainQuotes) {
if ((s == null) || (s = s.trim()).isEmpty()) {
return Stream.empty();
}
return new QuotedTokenizer(s, separators, false, retainQuotes).stream()
.filter(Strings::notEmpty);
}
private final static Pattern SIMPLE_LINE_SPLITTER = Pattern.compile("\r?\n");
public static Stream splitLinesAsStream(String s) {
if (s == null) {
return Stream.empty();
}
return SIMPLE_LINE_SPLITTER.splitAsStream(s);
}
public static List splitLines(String s) {
return splitLinesAsStream(s).collect(toList());
}
public static List splitQuoted(String s) {
return splitQuotedAsStream(s).collect(toList());
}
public static List splitQuoted(String s, String separators) {
return splitQuotedAsStream(s, separators).collect(toList());
}
public static List split(String regex, String s) {
if ((s == null) || (s = s.trim()).isEmpty())
return new ArrayList<>();
return split(s, Pattern.compile(regex));
}
public static boolean in(String[] skip, String key) {
for (String s : skip) {
if (key.equals(s))
return true;
}
return false;
}
public static char charAt(String s, int n) {
return s.charAt(adjustBegin(s, n));
}
public static String from(String s, int n) {
return s.substring(adjustBegin(s, n));
}
public static String substring(String s, int begin, int end) {
return s.substring(adjustBegin(s, begin), adjustEnd(s, end));
}
public static String substring(String s, int begin, int end, int stride) {
StringBuilder sb = new StringBuilder();
begin = adjustBegin(s, begin);
end = adjustEnd(s, end);
if (stride == 0)
stride = 1;
if (stride < 0)
for (int i = end - 1; i >= begin; i += stride) {
sb.append(s.charAt(i));
}
else
for (int i = begin; i < end; i += stride) {
sb.append(s.charAt(i));
}
return sb.toString();
}
public static String delete(String s, int begin, int end) {
return s.substring(0, adjustBegin(s, begin)) + s.substring(adjustEnd(s, end));
}
public static String to(String s, int end) {
return s.substring(0, adjustEnd(s, end));
}
public static int adjustBegin(String s, int n) {
if (n < 0)
n = s.length() + n;
return n;
}
public static int adjustEnd(String s, int n) {
if (n <= 0)
n = s.length() + n;
return n;
}
/**
* Split a string into a base and an extension.
*
* @param s the string that contains an extension
* @return null if no extension or an array of 2 elements, first is the
* prefix and second is the extension without a '.'
*/
public static String[] extension(String s) {
return last(s, '.');
}
/**
* Split a path (/ based) into a prefix and a last segment
*
* @param s the string that contains a path
* @return null if no extension or an array of 2 elements, first is the
* prefix and second is the last segment without a '/' at the start
*/
public static String[] lastPathSegment(String s) {
return last(s, '/');
}
/**
* Split a string into a prefix and a suffix based on the last time the
* separator appears
*
* @param s the string that contains a path
* @return null if no suffix or an array of 2 elements, first is the prefix
* and second is the suffix without the separator at the start
*/
public static String[] last(String s, char separator) {
int n = s.lastIndexOf(separator);
if (n >= 0) {
String[] answer = new String[2];
answer[0] = s.substring(0, n);
answer[1] = s.substring(n + 1);
return answer;
}
return null;
}
public static String[] first(String s, char separator) {
int n = s.indexOf(separator);
if (n >= 0) {
String[] answer = new String[2];
answer[0] = s.substring(0, n);
answer[1] = s.substring(n + 1);
return answer;
}
return null;
}
public static String stripPrefix(String s, String prefix) {
Pattern p = Pattern.compile(prefix);
return stripPrefix(s, p);
}
public static String stripPrefix(String s, Pattern p) {
Matcher matcher = p.matcher(s);
if (matcher.lookingAt()) {
return s.substring(matcher.end());
}
return null;
}
public static String stripSuffix(String s, String suffix) {
Pattern p = Pattern.compile(suffix);
return stripSuffix(s, p);
}
public static String stripSuffix(String s, Pattern p) {
Matcher matcher = p.matcher(s);
while (matcher.find()) {
if (matcher.end() == s.length())
return s.substring(0, matcher.start());
}
return null;
}
public static String ensureSuffix(String s, String suffix) {
if (s.endsWith(suffix))
return s;
return s + suffix;
}
public static String ensurePrefix(String s, String prefix) {
if (s.startsWith(prefix))
return s;
return prefix + s;
}
public static String times(String s, int times) {
if (times <= 1)
return s;
StringBuilder sb = new StringBuilder(times * s.length());
for (int i = 0; i < times; i++) {
sb.append(s);
}
return sb.toString();
}
/**
* This method is the same as String.format but it makes sure that any
* arrays are transformed to strings.
*
* @param string
* @param parms
*/
public static String format(String string, Object... parms) {
if (parms == null) {
parms = new Object[0];
}
return String.format(string, makePrintableArray(parms));
}
private static Object[] makePrintableArray(Object array) {
final int length = Array.getLength(array);
Object[] output = new Object[length];
for (int i = 0; i < length; i++) {
output[i] = makePrintable(Array.get(array, i));
}
return output;
}
private static Object makePrintable(Object object) {
if (object == null) {
return null;
}
if (object.getClass()
.isArray()) {
return Arrays.toString(makePrintableArray(object));
}
return object;
}
/**
* Compare two strings except for where the first group in pattern. The
* patterns is matched in the strings using find(). Only group 1 is ignored.
* Use ignored groups {@code(?:...)} to ignore irrelevant groups.
*
*
* a = "abcdefxxxxghixxxxx678"
* b = "abcdefxxghix678"
* Pattern "(x+)"
*
*
* First developed to compare two XML files that only differed in their
* increment number, which was a time long.
*
* @param a the first string to compare
* @param b the second string to compare
* @param pattern where first group should be ignored in the comparison
* @return true if the strings are equal ignoring the first group's pattern
* matches
*/
public static boolean compareExcept(String a, String b, Pattern pattern) {
Matcher ma = pattern.matcher(a);
Matcher mb = pattern.matcher(b);
int ra = 0, rb = 0;
while (ma.find()) {
if (!mb.find()) {
// pattern in first but not in second
return false;
}
int sa = ma.start(1);
int sb = mb.start(1);
if (sa - ra != sb - rb) {
// there must be differences before the pattern match
// since the length to the start of the match differs
// for both strings
return false;
}
for (int i = 0; i < sa - ra; i++) {
if (a.charAt(ra + i) != b.charAt(rb + i)) {
// strings do not match
return false;
}
}
ra = ma.end() + 1;
rb = mb.end() + 1;
}
if (a.length() - ra != b.length() - rb) {
// there must be differences before the pattern match
// since the length to the match differs
return false;
}
for (int i = 0; i < a.length() - ra; i++) {
if (a.charAt(ra + i) != b.charAt(rb + i)) {
// strings do not match
return false;
}
}
return true;
}
/**
* Convert a number to a string using SI magnitude prefixes like Mega, Giga,
* etc.
*/
enum Magnitude {
quaco("g", 1e-23, 0L),
zepto("z", 1e-21, 0L),
atto("a", 1e-18, 0L),
femto("f", 1e-15, 0L),
pico("p", 1e-12, 0L),
nano("n", 1e-9, 0L),
micro("µ", 1e-6, 0L),
milli("m", 1e-3, 0L),
unit("", 1e0, 1L),
kilo("k", 1e3, 0x400L),
mega("M", 1e6, 0x100000L),
giga("G", 1e9, 0x40000000L),
tera("T", 1e12, 0x10000000000L),
peta("P", 1e15, 0x4000000000000L),
exa("E", 1e18, 0x1000000000000000L);
final String prefix;
final double one;
final long byteUnit;
Magnitude(String prefix, double one, long byteUnit) {
this.prefix = prefix;
this.one = one;
this.byteUnit = byteUnit;
}
}
public static String toString(double n, String suffix) {
String prefix;
boolean isByte = suffix.equals("b");
if (isByte) {
if (n < 1) {
throw new IllegalArgumentException("If bytes are used, then the value must be >= 1, it is " + n);
}
}
for (Magnitude m : Magnitude.values()) {
if (m == Magnitude.exa || n < 1000 * m.one) {
n /= isByte ? m.byteUnit : m.one;
String s = m == Magnitude.unit ? String.format("%.0f %s%s", n, m.prefix, suffix)
: String.format("%.2f %s%s", n, m.prefix, suffix);
return s;
}
}
throw new IllegalArgumentException();
}
/**
* Escape illegal characters in a string with an escape character and the
* 4-digit hex Unicode encoding. A string escaped like this can be unescaped
* with {@link #unescape(String, char)} using the same escape character.
*
* @param string a string to be escaped
* @param illegalCharacters a pattern matching illegal characters, must
* include the escape character
* @param escape an escape character, must be included in the
* illegalCharacters
* @return a string that does not contain the illegalCharacters except the
* escape
*/
public static String escape(String string, Pattern illegalCharacters, char escape) {
if (string == null)
return null;
assert illegalCharacters != null : "illegalCharacters is mandator";
assert illegalCharacters.matcher("" + escape)
.find() : "the escape character must be in the set of illegalCharacters";
Matcher m = illegalCharacters.matcher(string);
if (!m.find())
return string;
StringBuffer sb = new StringBuffer();
do {
m.appendReplacement(sb, "");
for (int i = m.start(); i < m.end(); i++) {
char ch = string.charAt(i);
sb.append(escape);
Hex.append(sb, ch);
}
} while (m.find());
m.appendTail(sb);
return sb.toString();
}
/**
* Unescape a string with the given escape character. There must be 4 hex
* digits after each escape character.
*
* @param string the string to unescape, can be null
* @param escape the escape character
* @return an Optional, present if the escaping was successful
*/
public static Optional unescape(String string, char escape) {
if (string == null)
return Optional.empty();
int n = string.indexOf(escape);
if (n < 0)
return Optional.of(string);
StringBuffer sb = new StringBuffer();
int start = 0;
do {
sb.append(string, start, n);
if (n + 5 > string.length())
return Optional.empty();
int ch = 0;
for (int i = n + 1; i < n + 5; i++) {
char c = string.charAt(i);
if (!Hex.isHexCharacter(c)) {
return Optional.empty();
}
int nibble = Hex.nibble(c);
ch = (ch << 4) + nibble;
}
sb.append((char) ch);
start = n + 5;
n = string.indexOf(escape, start);
} while (n >= 0);
sb.append(string, start, string.length());
return Optional.of(sb.toString());
}
}
