org.apache.xmlbeans.impl.common.XmlWhitespace Maven / Gradle / Ivy
/* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.
*/
package org.apache.xmlbeans.impl.common;
import org.apache.xmlbeans.SchemaType;
public class XmlWhitespace
{
public static final int WS_UNSPECIFIED = SchemaType.WS_UNSPECIFIED;
public static final int WS_PRESERVE = SchemaType.WS_PRESERVE;
public static final int WS_REPLACE = SchemaType.WS_REPLACE;
public static final int WS_COLLAPSE = SchemaType.WS_COLLAPSE;
public static boolean isSpace(char ch)
{
switch (ch)
{
case ' ':
case '\n':
case '\r':
case '\t':
return true;
}
return false;
}
public static boolean isAllSpace(String v)
{
for (int i = 0, len = v.length(); i < len; i++)
{
if (!isSpace(v.charAt(i)))
return false;
}
return true;
}
public static boolean isAllSpace(CharSequence v)
{
for (int i = 0, len = v.length(); i < len; i++)
{
if (!isSpace(v.charAt(i)))
return false;
}
return true;
}
public static String collapse(String v)
{
return collapse(v, XmlWhitespace.WS_COLLAPSE);
}
/**
* The algorithm used by apply_wscanon: sometimes used in impls.
*/
public static String collapse(String v, int wsr)
{
if (wsr == SchemaType.WS_PRESERVE || wsr == SchemaType.WS_UNSPECIFIED)
return v;
if (v.indexOf('\n') >= 0)
v = v.replace('\n', ' ');
if (v.indexOf('\t') >= 0)
v = v.replace('\t', ' ');
if (v.indexOf('\r') >= 0)
v = v.replace('\r', ' ');
if (wsr == SchemaType.WS_REPLACE)
return v;
int j = 0;
int len = v.length();
if (len == 0)
return v;
int i;
/* a trick: examine every other character looking for pairs of spaces */
if (v.charAt(0) != ' ')
{
examine: {
for (j = 2; j < len; j += 2)
{
if (v.charAt(j) == ' ')
{
if (v.charAt(j - 1) == ' ')
break examine;
if (j == len - 1)
break examine;
j++;
if (v.charAt(j) == ' ')
break examine;
}
}
if (j == len && v.charAt(j - 1) == ' ')
break examine;
return v;
}
/* j is pointing at the first ws to be removed, or past end */
i = j;
}
else
{
/**
* j is pointing at the last whitespace in the initial run
*/
while (j + 1 < v.length() && v.charAt(j + 1) == ' ')
j += 1;
i = 0;
}
char[] ch = v.toCharArray();
shifter: for (;;)
{
for (;;)
{
/* j was ws or past end */
j++;
if (j >= len)
break shifter;
if (v.charAt(j) != ' ')
break;
}
for (;;)
{
/* j was nonws */
ch[i++] = ch[j++];
if (j >= len)
break shifter;
if (ch[j] == ' ')
{
ch[i++] = ch[j++];
if (j >= len)
break shifter;
if (ch[j] == ' ')
break;
}
}
}
return new String(ch, 0, (i == 0 || ch[i - 1] != ' ') ? i : i - 1);
}
}