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com.firefly.utils.lang.QuotedStringTokenizer Maven / Gradle / Ivy
package com.firefly.utils.lang;
import java.io.IOException;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;
/**
* StringTokenizer with Quoting support.
*
* This class is a copy of the java.util.StringTokenizer API and the behaviour
* is the same, except that single and double quoted string values are
* recognised. Delimiters within quotes are not considered delimiters. Quotes
* can be escaped with '\'.
*
* @see java.util.StringTokenizer
*
*/
public class QuotedStringTokenizer extends StringTokenizer {
private final static String __delim = "\t\n\r";
private String _string;
private String _delim = __delim;
private boolean _returnQuotes = false;
private boolean _returnDelimiters = false;
private StringBuffer _token;
private boolean _hasToken = false;
private int _i = 0;
private int _lastStart = 0;
private boolean _double = true;
private boolean _single = true;
public QuotedStringTokenizer(String str, String delim, boolean returnDelimiters, boolean returnQuotes) {
super("");
_string = str;
if (delim != null)
_delim = delim;
_returnDelimiters = returnDelimiters;
_returnQuotes = returnQuotes;
if (_delim.indexOf('\'') >= 0 || _delim.indexOf('"') >= 0)
throw new Error("Can't use quotes as delimiters: " + _delim);
_token = new StringBuffer(_string.length() > 1024 ? 512 : _string.length() / 2);
}
public QuotedStringTokenizer(String str, String delim, boolean returnDelimiters) {
this(str, delim, returnDelimiters, false);
}
public QuotedStringTokenizer(String str, String delim) {
this(str, delim, false, false);
}
public QuotedStringTokenizer(String str) {
this(str, null, false, false);
}
@Override
public boolean hasMoreTokens() {
// Already found a token
if (_hasToken)
return true;
_lastStart = _i;
int state = 0;
boolean escape = false;
while (_i < _string.length()) {
char c = _string.charAt(_i++);
switch (state) {
case 0: // Start
if (_delim.indexOf(c) >= 0) {
if (_returnDelimiters) {
_token.append(c);
return _hasToken = true;
}
} else if (c == '\'' && _single) {
if (_returnQuotes)
_token.append(c);
state = 2;
} else if (c == '\"' && _double) {
if (_returnQuotes)
_token.append(c);
state = 3;
} else {
_token.append(c);
_hasToken = true;
state = 1;
}
break;
case 1: // Token
_hasToken = true;
if (_delim.indexOf(c) >= 0) {
if (_returnDelimiters)
_i--;
return _hasToken;
} else if (c == '\'' && _single) {
if (_returnQuotes)
_token.append(c);
state = 2;
} else if (c == '\"' && _double) {
if (_returnQuotes)
_token.append(c);
state = 3;
} else {
_token.append(c);
}
break;
case 2: // Single Quote
_hasToken = true;
if (escape) {
escape = false;
_token.append(c);
} else if (c == '\'') {
if (_returnQuotes)
_token.append(c);
state = 1;
} else if (c == '\\') {
if (_returnQuotes)
_token.append(c);
escape = true;
} else {
_token.append(c);
}
break;
case 3: // Double Quote
_hasToken = true;
if (escape) {
escape = false;
_token.append(c);
} else if (c == '\"') {
if (_returnQuotes)
_token.append(c);
state = 1;
} else if (c == '\\') {
if (_returnQuotes)
_token.append(c);
escape = true;
} else {
_token.append(c);
}
break;
}
}
return _hasToken;
}
@Override
public String nextToken() throws NoSuchElementException {
if (!hasMoreTokens() || _token == null)
throw new NoSuchElementException();
String t = _token.toString();
_token.setLength(0);
_hasToken = false;
return t;
}
@Override
public String nextToken(String delim) throws NoSuchElementException {
_delim = delim;
_i = _lastStart;
_token.setLength(0);
_hasToken = false;
return nextToken();
}
@Override
public boolean hasMoreElements() {
return hasMoreTokens();
}
@Override
public Object nextElement() throws NoSuchElementException {
return nextToken();
}
/**
* Not implemented.
*/
@Override
public int countTokens() {
return -1;
}
/**
* Quote a string. The string is quoted only if quoting is required due to
* embedded delimiters, quote characters or the empty string.
*
* @param s
* The string to quote.
* @param delim
* the delimiter to use to quote the string
* @return quoted string
*/
public static String quoteIfNeeded(String s, String delim) {
if (s == null)
return null;
if (s.length() == 0)
return "\"\"";
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c == '\\' || c == '"' || c == '\'' || Character.isWhitespace(c) || delim.indexOf(c) >= 0) {
StringBuffer b = new StringBuffer(s.length() + 8);
quote(b, s);
return b.toString();
}
}
return s;
}
/**
* Quote a string. The string is quoted only if quoting is required due to
* embeded delimiters, quote characters or the empty string.
*
* @param s
* The string to quote.
* @return quoted string
*/
public static String quote(String s) {
if (s == null)
return null;
if (s.length() == 0)
return "\"\"";
StringBuffer b = new StringBuffer(s.length() + 8);
quote(b, s);
return b.toString();
}
private static final char[] escapes = new char[32];
static {
Arrays.fill(escapes, (char) 0xFFFF);
escapes['\b'] = 'b';
escapes['\t'] = 't';
escapes['\n'] = 'n';
escapes['\f'] = 'f';
escapes['\r'] = 'r';
}
/**
* Quote a string into an Appendable. Only quotes and backslash are escaped.
*
* @param buffer
* The Appendable
* @param input
* The String to quote.
*/
public static void quoteOnly(Appendable buffer, String input) {
if (input == null)
return;
try {
buffer.append('"');
for (int i = 0; i < input.length(); ++i) {
char c = input.charAt(i);
if (c == '"' || c == '\\')
buffer.append('\\');
buffer.append(c);
}
buffer.append('"');
} catch (IOException x) {
throw new RuntimeException(x);
}
}
/**
* Quote a string into an Appendable. The characters ", \, \n, \r, \t, \f
* and \b are escaped
*
* @param buffer
* The Appendable
* @param input
* The String to quote.
*/
public static void quote(Appendable buffer, String input) {
if (input == null)
return;
try {
buffer.append('"');
for (int i = 0; i < input.length(); ++i) {
char c = input.charAt(i);
if (c >= 32) {
if (c == '"' || c == '\\')
buffer.append('\\');
buffer.append(c);
} else {
char escape = escapes[c];
if (escape == 0xFFFF) {
// Unicode escape
buffer.append('\\').append('u').append('0').append('0');
if (c < 0x10)
buffer.append('0');
buffer.append(Integer.toString(c, 16));
} else {
buffer.append('\\').append(escape);
}
}
}
buffer.append('"');
} catch (IOException x) {
throw new RuntimeException(x);
}
}
public static String unquoteOnly(String s) {
return unquoteOnly(s, false);
}
/**
* Unquote a string, NOT converting unicode sequences
*
* @param s
* The string to unquote.
* @param lenient
* if true, will leave in backslashes that aren't valid escapes
* @return quoted string
*/
public static String unquoteOnly(String s, boolean lenient) {
if (s == null)
return null;
if (s.length() < 2)
return s;
char first = s.charAt(0);
char last = s.charAt(s.length() - 1);
if (first != last || (first != '"' && first != '\''))
return s;
StringBuilder b = new StringBuilder(s.length() - 2);
boolean escape = false;
for (int i = 1; i < s.length() - 1; i++) {
char c = s.charAt(i);
if (escape) {
escape = false;
if (lenient && !isValidEscaping(c)) {
b.append('\\');
}
b.append(c);
} else if (c == '\\') {
escape = true;
} else {
b.append(c);
}
}
return b.toString();
}
public static String unquote(String s) {
return unquote(s, false);
}
/**
* Unquote a string.
*
* @param s
* The string to unquote.
* @param lenient
* true if unquoting should be lenient to escaped content,
* leaving some alone, false if string unescaping
* @return quoted string
*/
public static String unquote(String s, boolean lenient) {
if (s == null)
return null;
if (s.length() < 2)
return s;
char first = s.charAt(0);
char last = s.charAt(s.length() - 1);
if (first != last || (first != '"' && first != '\''))
return s;
StringBuilder b = new StringBuilder(s.length() - 2);
boolean escape = false;
for (int i = 1; i < s.length() - 1; i++) {
char c = s.charAt(i);
if (escape) {
escape = false;
switch (c) {
case 'n':
b.append('\n');
break;
case 'r':
b.append('\r');
break;
case 't':
b.append('\t');
break;
case 'f':
b.append('\f');
break;
case 'b':
b.append('\b');
break;
case '\\':
b.append('\\');
break;
case '/':
b.append('/');
break;
case '"':
b.append('"');
break;
case 'u':
b.append((char) ((TypeUtils.convertHexDigit((byte) s.charAt(i++)) << 24)
+ (TypeUtils.convertHexDigit((byte) s.charAt(i++)) << 16)
+ (TypeUtils.convertHexDigit((byte) s.charAt(i++)) << 8)
+ (TypeUtils.convertHexDigit((byte) s.charAt(i++)))));
break;
default:
if (lenient && !isValidEscaping(c)) {
b.append('\\');
}
b.append(c);
}
} else if (c == '\\') {
escape = true;
} else {
b.append(c);
}
}
return b.toString();
}
/**
* Check that char c (which is preceded by a backslash) is a valid escape
* sequence.
*
* @param c
* @return
*/
private static boolean isValidEscaping(char c) {
return ((c == 'n') || (c == 'r') || (c == 't') || (c == 'f') || (c == 'b') || (c == '\\') || (c == '/')
|| (c == '"') || (c == 'u'));
}
public static boolean isQuoted(String s) {
return s != null && s.length() > 0 && s.charAt(0) == '"' && s.charAt(s.length() - 1) == '"';
}
/**
* @return handle double quotes if true
*/
public boolean getDouble() {
return _double;
}
/**
* @param d
* handle double quotes if true
*/
public void setDouble(boolean d) {
_double = d;
}
/**
* @return handle single quotes if true
*/
public boolean getSingle() {
return _single;
}
/**
* @param single
* handle single quotes if true
*/
public void setSingle(boolean single) {
_single = single;
}
}
