/*
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package juzu.impl.asset;
import juzu.impl.common.CompositeReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
/** @author Julien Viet */
public class NormalizeJSReader extends Reader {
private boolean finished = false;
private boolean multiComments = false;
private boolean singleComment = false;
private Reader sub;
public NormalizeJSReader(Reader sub) {
this.sub = sub;
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
if (finished) {
return sub.read(cbuf, off, len);
} else {
char[] buffer = new char[len];
int relLen = sub.read(buffer, 0, len);
if (relLen == -1) {
finished = true;
return -1;
} else {
int r = off;
for (int i = 0; i < relLen; i++) {
char c = buffer[i];
char next = 0;
boolean skip = false, overflow = (i + 1 == relLen);
if (!finished) {
skip = true;
if (!singleComment && c == '/' && (next = readNext(buffer, i, overflow)) == '*') {
multiComments = true;
i++;
} else if (!singleComment && c == '*' && (next = readNext(buffer, i, overflow)) == '/') {
multiComments = false;
i++;
} else if (!multiComments && c == '/' && next == '/') {
singleComment = true;
i++;
} else if (c == '\n') {
singleComment = false;
} else if (c != ' ') {
skip = false;
}
if (!skip && !multiComments && !singleComment) {
if (next != 0 && overflow) {
sub = new CompositeReader(new StringReader(String.valueOf(c)), sub);
}
cbuf[r++] = c;
finished = true;
}
} else {
cbuf[r++] = c;
}
}
return r - off;
}
}
}
private char readNext(char[] buffer, int i, boolean overflow) throws IOException {
char c = 0;
if (overflow) {
int tmp = sub.read();
if (tmp != -1) {
c = (char)tmp;
}
} else {
c = buffer[i + 1];
}
return c;
}
@Override
public void close() throws IOException {
sub.close();
}
}