1 files changed, 168 insertions, 0 deletions
diff --git a/src/java/org/anarres/cpp/JoinReader.java b/src/java/org/anarres/cpp/JoinReader.java
new file mode 100644
index 0000000..10ec535
--- /dev/null
+++ b/src/java/org/anarres/cpp/JoinReader.java
@@ -0,0 +1,168 @@
+/*
+ * 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);
+	}
+
+	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();
+	}
+*/
+
+}