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/*
* Anarres C Preprocessor
* Copyright (c) 2007-2008, Shevek
*
* 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.anarres.cpp;
import java.io.Closeable;
import java.io.IOException;
import java.io.Reader;
/* pp */ class JoinReader /* extends Reader */ implements Closeable {
private final Reader in;
private PreprocessorListener listener;
private LexerSource source;
private boolean trigraphs;
private boolean warnings;
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, boolean warnings) {
this.trigraphs = enable;
this.warnings = warnings;
}
/* pp */ void init(Preprocessor pp, LexerSource s) {
this.listener = pp.getListener();
this.source = s;
setTrigraphs(pp.getFeature(Feature.TRIGRAPHS),
pp.getWarning(Warning.TRIGRAPHS));
}
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;
assert uptr <= unget.length :
"JoinReader ungets too many characters";
}
protected void warning(String msg)
throws LexerException {
if (source != null)
source.warning(msg);
else
throw new LexerException(msg);
}
private char trigraph(char raw, char repl)
throws IOException, LexerException {
if (trigraphs) {
if (warnings)
warning("trigraph ??" + raw + " converted to " + repl);
return repl;
} else {
if (warnings)
warning("trigraph ??" + raw + " ignored");
_unread(raw);
_unread('?');
return '?';
}
}
private int _read()
throws IOException, LexerException {
int c = __read();
if (c == '?' && (trigraphs || warnings)) {
int d = __read();
if (d == '?') {
int e = __read();
switch (e) {
case '(':
return trigraph('(', '[');
case ')':
return trigraph(')', ']');
case '<':
return trigraph('<', '{');
case '>':
return trigraph('>', '}');
case '=':
return trigraph('=', '#');
case '/':
return trigraph('/', '\\');
case '\'':
return trigraph('\'', '^');
case '!':
return trigraph('!', '|');
case '-':
return trigraph('-', '~');
}
_unread(e);
}
_unread(d);
}
return c;
}
public int read()
throws IOException, LexerException {
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, LexerException {
for (int i = 0; i < len; i++) {
int ch = read();
if (ch == -1)
return i;
cbuf[off + i] = (char) ch;
}
return len;
}
@Override
public void close()
throws IOException {
in.close();
}
@Override
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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