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/*******************************************************************************
* Copyright (c) 2004 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.wst.html.core.internal.format;
final class SpaceConverter {
private String source = null;
private int length = 0;
private int startOffset = 0;
private int endOffset = 0;
private int spaceCount = 0;
private int wordCount = 0;
private StringBuffer buffer = null;
private int lastOffset = 0;
private boolean keepBlankLines = false;
/**
*/
public SpaceConverter(String source) {
super();
if (source == null) {
this.source = new String();
}
else {
this.source = source;
this.length = source.length();
}
}
/**
*/
public SpaceConverter(String source, boolean keepBlankLines) {
super();
if (source == null) {
this.source = new String();
}
else {
this.source = source;
this.length = source.length();
}
this.keepBlankLines = keepBlankLines;
}
/**
*/
public void compressSpaces() {
if (this.spaceCount == 0)
return;
if (this.spaceCount == 1 && this.source.charAt(this.startOffset) == ' ')
return;
if (this.buffer == null)
this.buffer = new StringBuffer();
if (this.startOffset > this.lastOffset) {
this.buffer.append(this.source.substring(this.lastOffset, this.startOffset));
}
this.buffer.append(' ');
this.lastOffset = this.startOffset + this.spaceCount;
}
/**
*/
public String getSource() {
if (this.buffer == null)
this.buffer = new StringBuffer();
if (this.length > this.lastOffset) {
this.buffer.append(this.source.substring(this.lastOffset, this.length));
}
return this.buffer.toString();
}
/**
*/
public int getSpaceCount() {
return this.spaceCount;
}
/**
*/
public boolean hasSpaces() {
return (this.spaceCount > 0);
}
/**
*/
public boolean isModified() {
return (this.buffer != null);
}
/**
* Add number of the old blank lines to new space string
*/
private static String mergeBlankLines(String newSpaces, String oldSpaces) {
if (newSpaces == null || newSpaces.length() == 0)
return newSpaces;
if (oldSpaces == null)
return newSpaces;
// count old new lines
int newLineCount = 0;
int oldLength = oldSpaces.length();
for (int i = 0; i < oldLength; i++) {
char c = oldSpaces.charAt(i);
if (c == '\r') {
newLineCount++;
if (i + 1 < oldLength) {
c = oldSpaces.charAt(i + 1);
if (c == '\n')
i++;
}
}
else {
if (c == '\n')
newLineCount++;
}
}
if (newLineCount < 2)
return newSpaces; // no blank line
// here assuming newSpaces starts with a new line if any
String delim = null;
char d = newSpaces.charAt(0);
if (d == '\r') {
if (newSpaces.length() > 1 && newSpaces.charAt(1) == '\n')
delim = "\r\n";//$NON-NLS-1$
else
delim = "\r";//$NON-NLS-1$
}
else {
if (d == '\n')
delim = "\n";//$NON-NLS-1$
else
return newSpaces; // no new line
}
newLineCount--;
StringBuffer buffer = new StringBuffer(newSpaces.length() + newLineCount * 2);
while (newLineCount > 0) {
buffer.append(delim);
newLineCount--;
}
buffer.append(newSpaces);
return buffer.toString();
}
/**
*/
public int nextWord() {
if (this.endOffset == this.length) {
this.startOffset = this.endOffset;
this.spaceCount = 0;
this.wordCount = 0;
return 0;
}
this.startOffset = this.endOffset;
int i = this.startOffset;
for (; i < this.length; i++) {
if (!Character.isWhitespace(this.source.charAt(i)))
break;
}
this.spaceCount = i - this.startOffset;
int wordOffset = i;
for (; i < this.length; i++) {
if (Character.isWhitespace(this.source.charAt(i)))
break;
}
this.wordCount = i - wordOffset;
this.endOffset = i;
return this.wordCount;
}
/**
*/
public void replaceSpaces(String spaces) {
int spaceLength = (spaces != null ? spaces.length() : 0);
String oldSpaces = null;
if (spaceLength == this.spaceCount) {
if (spaceLength == 0)
return;
if (this.startOffset == 0) {
if (this.source.startsWith(spaces))
return;
}
else if (this.endOffset == this.length) {
if (this.source.endsWith(spaces))
return;
}
else {
int textOffset = this.startOffset + this.spaceCount;
oldSpaces = this.source.substring(this.startOffset, textOffset);
if (oldSpaces.equals(spaces))
return;
}
}
if (this.keepBlankLines && this.spaceCount > 0) {
if (oldSpaces == null) {
int textOffset = this.startOffset + this.spaceCount;
oldSpaces = this.source.substring(this.startOffset, textOffset);
}
if (oldSpaces != null) {
spaces = mergeBlankLines(spaces, oldSpaces);
}
}
if (this.buffer == null)
this.buffer = new StringBuffer();
if (this.startOffset > this.lastOffset) {
this.buffer.append(this.source.substring(this.lastOffset, this.startOffset));
}
if (spaceLength > 0)
this.buffer.append(spaces);
this.lastOffset = this.startOffset + this.spaceCount;
}
}
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