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/*
* Anarres C Preprocessor
* Copyright (C) 2007 Shevek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.anarres.cpp;
import java.io.Reader;
import java.io.PushbackReader;
import java.io.IOException;
/* pp */ class JoinReader extends Reader {
private Reader in;
private boolean trigraphs;
private int newlines;
private boolean flushnl;
private int[] unget;
private int uptr;
public JoinReader(Reader in, boolean trigraphs) {
this.in = in;
this.trigraphs = trigraphs;
this.newlines = 0;
this.flushnl = false;
this.unget = new int[2];
this.uptr = 0;
}
public JoinReader(Reader in) {
this(in, false);
}
public void setTrigraphs(boolean enable) {
this.trigraphs = enable;
}
private int __read() throws IOException {
if (uptr > 0)
return unget[--uptr];
return in.read();
}
private void _unread(int c) {
if (c != -1)
unget[uptr++] = c;
}
private int _read() throws IOException {
int c = __read();
if (c == '?' && trigraphs) {
int d = __read();
if (d == '?') {
int e = __read();
switch (e) {
case '(': return '[';
case ')': return ']';
case '<': return '{';
case '>': return '}';
case '=': return '#';
case '/': return '\\';
case '\'': return '^';
case '!': return '|';
case '-': return '~';
}
_unread(e);
}
_unread(d);
}
return c;
}
public int read() throws IOException {
if (flushnl) {
if (newlines > 0) {
newlines--;
return '\n';
}
flushnl = false;
}
for (;;) {
int c = _read();
switch (c) {
case '\\':
int d = _read();
switch (d) {
case '\n':
newlines++;
continue;
case '\r':
newlines++;
int e = _read();
if (e != '\n')
_unread(e);
continue;
default:
_unread(d);
return c;
}
case '\r':
case '\n':
case '\u2028':
case '\u2029':
case '\u000B':
case '\u000C':
case '\u0085':
flushnl = true;
return c;
case -1:
if (newlines > 0) {
newlines--;
return '\n';
}
default:
return c;
}
}
}
public int read(char cbuf[], int off, int len)
throws IOException {
for (int i = 0; i < len; i++) {
int ch = read();
if (ch == -1)
return i;
cbuf[off + i] = (char)ch;
}
return len;
}
public void close()
throws IOException {
in.close();
}
public String toString() {
return "JoinReader(nl=" + newlines + ")";
}
/*
public static void main(String[] args) throws IOException {
FileReader f = new FileReader(new File(args[0]));
BufferedReader b = new BufferedReader(f);
JoinReader r = new JoinReader(b);
BufferedWriter w = new BufferedWriter(
new java.io.OutputStreamWriter(System.out)
);
int c;
while ((c = r.read()) != -1) {
w.write((char)c);
}
w.close();
}
*/
}
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