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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.document;
/**
*/
class TagScanner {
private String tag = null;
private int offset = 0;
private int length = 0;
private boolean oneLine = false;
/**
*/
TagScanner(String tag, int offset) {
super();
this.tag = tag;
this.offset = offset;
if (tag != null)
this.length = tag.length();
}
/**
*/
TagScanner(String tag, int offset, boolean oneLine) {
this(tag, offset);
this.oneLine = oneLine;
}
/**
*/
int getNextOffset() {
for (; this.offset < this.length; this.offset++) {
char c = this.tag.charAt(this.offset);
if (!isEnd(c))
break;
}
return this.offset;
}
/**
*/
int getOffset() {
return this.offset;
}
/**
*/
private final boolean isEnd(char c) {
return (this.oneLine && (c == '\r' || c == '\n'));
}
/**
*/
private static boolean isEqual(char c) {
return (c == '=');
}
/**
*/
private static boolean isQuote(char c) {
return (c == '"' || c == '\'');
}
/**
*/
private static boolean isSpace(char c) {
return Character.isWhitespace(c);
}
/**
*/
private char nextChar() {
for (; this.offset < this.length; this.offset++) {
char c = this.tag.charAt(this.offset);
if (isEnd(c))
break;
if (!isSpace(c))
return c;
}
return 0;
}
/**
*/
String nextName() {
if (this.tag == null)
return null;
if (this.offset >= this.length)
return null;
if (nextChar() == 0)
return null;
int nameOffset = this.offset;
for (; this.offset < this.length; this.offset++) {
char c = this.tag.charAt(this.offset);
if (isEnd(c) || isSpace(c))
break;
if (isEqual(c) && this.offset > nameOffset)
break;
}
if (this.offset == nameOffset)
return null;
return this.tag.substring(nameOffset, this.offset);
}
/**
*/
String nextValue() {
if (this.tag == null)
return null;
if (this.offset >= this.length)
return null;
char seperator = nextChar();
if (!isEqual(seperator))
return null;
this.offset++; // skip '='
char quote = nextChar();
if (quote == 0)
return null;
if (isQuote(quote))
this.offset++;
else
quote = 0;
int valueOffset = this.offset;
for (; this.offset < this.length; this.offset++) {
char c = this.tag.charAt(this.offset);
if (isEnd(c)) {
quote = 0;
break;
}
if (quote == 0) {
if (isSpace(c))
break;
}
else {
if (c == quote)
break;
}
}
int valueEnd = this.offset;
if (quote != 0 && this.offset < this.length)
this.offset++;
if (valueEnd == valueOffset)
return null;
return this.tag.substring(valueOffset, valueEnd);
}
}
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