1 files changed, 95 insertions, 0 deletions
diff --git a/lib/jdiff/src/util/DiffOutput.java b/lib/jdiff/src/util/DiffOutput.java
new file mode 100644
index 000000000..06d058d4d
--- /dev/null
+++ b/lib/jdiff/src/util/DiffOutput.java
@@ -0,0 +1,95 @@
+/*
+ * DiffOutput.java
+ * Copyright (c) 2001 Andre Kaplan
+ *
+ * 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 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+*/
+
+
+package jdiff.util;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.io.OutputStreamWriter;
+
+
+
+/** A base class for printing edit scripts produced by Diff. */
+public abstract class DiffOutput {
+    /** Set to the lines of the files being compared. */
+    protected Object[] file0;
+    protected Object[] file1;
+
+    protected String lineSeparator;
+    protected Writer out;
+
+
+    protected DiffOutput(Object[] a,Object[] b) {
+        this.lineSeparator = System.getProperty("java.line.separator");
+        this.out = new OutputStreamWriter(System.out);
+        this.file0 = a;
+        this.file1 = b;
+    }
+
+
+    public void setOut(Writer out) {
+        this.out = out;
+    }
+
+
+    public void setLineSeparator(String lineSeparator) {
+        this.lineSeparator = lineSeparator;
+    }
+
+
+    abstract public void writeScript(Diff.change script) throws IOException;
+
+
+    protected void writeLine(String prefix, Object line) throws IOException {
+        out.write(prefix + line.toString() + this.lineSeparator);
+    }
+
+
+    /** Write a pair of line numbers separated with sepChar.
+        If the two numbers are identical, print just one number.
+
+        Args a and b are internal line numbers (ranging from 0)
+        We write the translated (real) line numbers ranging from 1).
+    */
+    protected void writeNumberRange(char sepChar, int a, int b)  throws IOException {
+        /* Note: we can have b < a in the case of a range of no lines.
+        In this case, we should write the line number before the range,
+        which is b.  */
+        if (++b > ++a) {
+            out.write(Integer.toString(a));
+            out.write(sepChar);
+            out.write(Integer.toString(b));
+        } else {
+            out.write(Integer.toString(b));
+        }
+    }
+
+
+    public static char changeLetter(int inserts, int deletes) {
+        if (inserts == 0) {
+            return 'd';
+        } else if (deletes == 0) {
+            return 'a';
+        } else {
+            return 'c';
+        }
+    }
+}
+