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/*******************************************************************************
* Copyright (c) 2003, 2016 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.util;
import java.util.ArrayList;
import java.util.List;
/**
* Simple tokenizer class. Used to parse data.
*/
public class Tokenizer {
protected char value[];
protected int max;
protected int cursor;
public Tokenizer(String value) {
this.value = value.toCharArray();
max = this.value.length;
cursor = 0;
}
private void skipWhiteSpace() {
char[] val = value;
int cur = cursor;
for (; cur < max; cur++) {
char c = val[cur];
if ((c == ' ') || (c == '\t') || (c == '\n') || (c == '\r')) {
continue;
}
break;
}
cursor = cur;
}
public String getToken(String terminals) {
skipWhiteSpace();
char[] val = value;
int cur = cursor;
int begin = cur;
for (; cur < max; cur++) {
char c = val[cur];
if ((terminals.indexOf(c) != -1)) {
break;
}
}
cursor = cur;
int count = cur - begin;
if (count > 0) {
skipWhiteSpace();
while (count > 0 && (val[begin + count - 1] == ' ' || val[begin + count - 1] == '\t'))
count--;
return (new String(val, begin, count));
}
return (null);
}
public String getEscapedToken(String terminals) {
char[] val = value;
int cur = cursor;
if (cur >= max)
return null;
StringBuffer sb = new StringBuffer();
char c;
for (; cur < max; cur++) {
c = val[cur];
// this is an escaped char
if (c == '\\') {
cur++; // skip the escape char
if (cur == max)
break;
c = val[cur]; // include the escaped char
} else if (terminals.indexOf(c) != -1) {
break;
}
sb.append(c);
}
cursor = cur;
return sb.toString();
}
public List<String> getEscapedTokens(String terminals) {
List<String> result = new ArrayList<>();
for (String token = getEscapedToken(terminals); token != null; token = getEscapedToken(terminals)) {
result.add(token);
getChar(); // consume terminal
}
return result;
}
public String getString(String terminals, String preserveEscapes) {
skipWhiteSpace();
char[] val = value;
int cur = cursor;
if (cur < max) {
if (val[cur] == '\"') /* if a quoted string */
{
StringBuffer sb = new StringBuffer();
cur++; /* skip quote */
char c = '\0';
for (; cur < max; cur++) {
c = val[cur];
// this is an escaped char
if (c == '\\') {
cur++; // skip the escape char
if (cur == max)
break;
c = val[cur]; // include the escaped char
if (preserveEscapes != null && preserveEscapes.indexOf(c) != -1)
sb.append('\\'); // must preserve escapes for c
} else if (c == '\"') {
break;
}
sb.append(c);
}
if (c == '\"') {
cur++;
} // TODO else error; no closing quote?
cursor = cur;
skipWhiteSpace();
return sb.toString();
}
/* not a quoted string; same as token */
return getToken(terminals);
}
return (null);
}
public String getString(String terminals) {
return getString(terminals, null);
}
public char getChar() {
int cur = cursor;
if (cur < max) {
cursor = cur + 1;
return (value[cur]);
}
return ('\0'); /* end of value */
}
public boolean hasMoreTokens() {
if (cursor < max) {
return true;
}
return false;
}
}
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