org.apache.xmlgraphics.ps.dsc.events.AbstractDSCComment Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id: AbstractDSCComment.java 1345683 2012-06-03 14:50:33Z gadams $ */
package org.apache.xmlgraphics.ps.dsc.events;
import java.util.List;
/**
* Abstract base class for DSC comments.
*/
public abstract class AbstractDSCComment extends AbstractEvent implements DSCComment {
private boolean isWhitespace(char c) {
return c == ' ' || c == '\t';
}
private int parseNextParam(String value, int pos, List lst) {
int startPos = pos;
pos++;
while (pos < value.length() && !isWhitespace(value.charAt(pos))) {
pos++;
}
String param = value.substring(startPos, pos);
lst.add(param);
return pos;
}
private int parseNextParentheseString(String value, int pos, List lst) {
int nestLevel = 1;
pos++;
StringBuffer sb = new StringBuffer();
while (pos < value.length() && nestLevel > 0) {
final char c = value.charAt(pos);
switch (c) {
case '(':
nestLevel++;
if (nestLevel > 1) {
sb.append(c);
}
break;
case ')':
if (nestLevel > 1) {
sb.append(c);
}
nestLevel--;
break;
case '\\':
pos++;
char cnext = value.charAt(pos);
switch (cnext) {
case '\\':
sb.append(cnext);
break;
case 'n':
sb.append('\n');
break;
case 'r':
sb.append('\r');
break;
case 't':
sb.append('\t');
break;
case 'b':
sb.append('\b');
break;
case 'f':
sb.append('\f');
break;
case '(':
sb.append('(');
break;
case ')':
sb.append(')');
break;
default:
int code = Integer.parseInt(value.substring(pos, pos + 3), 8);
sb.append((char)code);
pos += 2;
}
break;
default:
sb.append(c);
}
pos++;
}
lst.add(sb.toString());
pos++;
return pos;
}
/**
* Splits the params of the DSC comment value in to a List.
* @param value the DSC comment value
* @return the List of values
*/
protected List splitParams(String value) {
List lst = new java.util.ArrayList();
int pos = 0;
value = value.trim();
while (pos < value.length()) {
if (isWhitespace(value.charAt(pos))) {
pos++;
continue;
}
if (value.charAt(pos) == '(') {
pos = parseNextParentheseString(value, pos, lst);
} else {
pos = parseNextParam(value, pos, lst);
}
}
return lst;
}
/**
* @see org.apache.xmlgraphics.ps.dsc.events.DSCComment#isAtend()
*/
public boolean isAtend() {
return false;
}
/**
* @see org.apache.xmlgraphics.ps.dsc.events.AbstractEvent#asDSCComment()
*/
public DSCComment asDSCComment() {
return this;
}
/**
* @see org.apache.xmlgraphics.ps.dsc.events.AbstractEvent#isDSCComment()
*/
public boolean isDSCComment() {
return true;
}
/**
* @see org.apache.xmlgraphics.ps.dsc.events.DSCEvent#getEventType()
*/
public int getEventType() {
return DSC_COMMENT;
}
}