1 files changed, 155 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/TabsToSpaces.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/TabsToSpaces.java
new file mode 100644
index 00000000..adaaa7af
--- /dev/null
+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/TabsToSpaces.java
@@ -0,0 +1,155 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You 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.apache.tools.ant.filters;
+
+import java.io.IOException;
+import java.io.Reader;
+
+import org.apache.tools.ant.types.Parameter;
+
+/**
+ * Converts tabs to spaces.
+ *
+ * Example:
+ *
+ * <pre>&lt;tabstospaces tablength=&quot;8&quot;/&gt;</pre>
+ *
+ * Or:
+ *
+ * <pre>&lt;filterreader classname=&quot;org.apache.tools.ant.filters.TabsToSpaces&quot;&gt;
+ *   &lt;param name=&quot;tablength&quot; value=&quot;8&quot;/&gt;
+ * &lt;/filterreader&gt;</pre>
+ *
+ */
+public final class TabsToSpaces
+    extends BaseParamFilterReader
+    implements ChainableReader {
+    /** The default tab length. */
+    private static final int DEFAULT_TAB_LENGTH = 8;
+
+    /** Parameter name for the length of a tab. */
+    private static final String TAB_LENGTH_KEY = "tablength";
+
+    /** Tab length in this filter. */
+    private int tabLength = DEFAULT_TAB_LENGTH;
+
+    /** The number of spaces still to be read to represent the last-read tab. */
+    private int spacesRemaining = 0;
+
+    /**
+     * Constructor for "dummy" instances.
+     *
+     * @see BaseFilterReader#BaseFilterReader()
+     */
+    public TabsToSpaces() {
+        super();
+    }
+
+    /**
+     * Creates a new filtered reader.
+     *
+     * @param in A Reader object providing the underlying stream.
+     *           Must not be <code>null</code>.
+     */
+    public TabsToSpaces(final Reader in) {
+        super(in);
+    }
+
+    /**
+     * Returns the next character in the filtered stream, converting tabs
+     * to the specified number of spaces.
+     *
+     * @return the next character in the resulting stream, or -1
+     * if the end of the resulting stream has been reached
+     *
+     * @exception IOException if the underlying stream throws an IOException
+     * during reading
+     */
+    public int read() throws IOException {
+        if (!getInitialized()) {
+            initialize();
+            setInitialized(true);
+        }
+
+        int ch = -1;
+
+        if (spacesRemaining > 0) {
+            spacesRemaining--;
+            ch = ' ';
+        } else {
+            ch = in.read();
+            if (ch == '\t') {
+                spacesRemaining = tabLength - 1;
+                ch = ' ';
+            }
+        }
+        return ch;
+    }
+
+    /**
+     * Sets the tab length.
+     *
+     * @param tabLength the number of spaces to be used when converting a tab.
+     */
+    public void setTablength(final int tabLength) {
+        this.tabLength = tabLength;
+    }
+
+    /**
+     * Returns the tab length.
+     *
+     * @return the number of spaces used when converting a tab
+     */
+    private int getTablength() {
+        return tabLength;
+    }
+
+    /**
+     * Creates a new TabsToSpaces using the passed in
+     * Reader for instantiation.
+     *
+     * @param rdr A Reader object providing the underlying stream.
+     *            Must not be <code>null</code>.
+     *
+     * @return a new filter based on this configuration, but filtering
+     *         the specified reader
+     */
+    public Reader chain(final Reader rdr) {
+        TabsToSpaces newFilter = new TabsToSpaces(rdr);
+        newFilter.setTablength(getTablength());
+        newFilter.setInitialized(true);
+        return newFilter;
+    }
+
+    /**
+     * Parses the parameters to set the tab length.
+     */
+    private void initialize() {
+        Parameter[] params = getParameters();
+        if (params != null) {
+            for (int i = 0; i < params.length; i++) {
+                if (params[i] != null) {
+                    if (TAB_LENGTH_KEY.equals(params[i].getName())) {
+                        tabLength = Integer.parseInt(params[i].getValue());
+                        break;
+                    }
+                }
+            }
+        }
+    }
+}