1 files changed, 149 insertions, 0 deletions
diff --git a/src/main/java/com/jogamp/gluegen/jcpp/CppReader.java b/src/main/java/com/jogamp/gluegen/jcpp/CppReader.java
new file mode 100644
index 0000000..82ef2fe
--- /dev/null
+++ b/src/main/java/com/jogamp/gluegen/jcpp/CppReader.java
@@ -0,0 +1,149 @@
+/*
+ * 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 com.jogamp.gluegen.jcpp;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.Reader;
+
+import javax.annotation.Nonnull;
+
+import static com.jogamp.gluegen.jcpp.Token.CCOMMENT;
+import static com.jogamp.gluegen.jcpp.Token.CPPCOMMENT;
+import static com.jogamp.gluegen.jcpp.Token.EOF;
+
+/**
+ * A Reader wrapper around the Preprocessor.
+ *
+ * This is a utility class to provide a transparent {@link Reader}
+ * which preprocesses the input text.
+ *
+ * @see Preprocessor
+ * @see Reader
+ */
+public class CppReader extends Reader implements Closeable {
+
+    private final Preprocessor cpp;
+    private String token;
+    private int idx;
+
+    public CppReader(@Nonnull final Reader r) {
+        cpp = new Preprocessor(new LexerSource(r, true) {
+            @Override
+            public String getName() {
+                return "<CppReader Input@"
+                        + System.identityHashCode(r) + ">";
+            }
+        });
+        token = "";
+        idx = 0;
+    }
+
+    public CppReader(@Nonnull Preprocessor p) {
+        cpp = p;
+        token = "";
+        idx = 0;
+    }
+
+    /**
+     * Returns the Preprocessor used by this CppReader.
+     */
+    @Nonnull
+    public Preprocessor getPreprocessor() {
+        return cpp;
+    }
+
+    /**
+     * Defines the given name as a macro.
+     *
+     * This is a convnience method.
+     */
+    public void addMacro(@Nonnull String name)
+            throws LexerException {
+        cpp.addMacro(name);
+    }
+
+    /**
+     * Defines the given name as a macro.
+     *
+     * This is a convnience method.
+     */
+    public void addMacro(@Nonnull String name, @Nonnull String value)
+            throws LexerException {
+        cpp.addMacro(name, value);
+    }
+
+    private boolean refill()
+            throws IOException {
+        try {
+            assert cpp != null : "cpp is null : was it closed?";
+            if (token == null)
+                return false;
+            while (idx >= token.length()) {
+                Token tok = cpp.token();
+                switch (tok.getType()) {
+                    case EOF:
+                        token = null;
+                        return false;
+                    case CCOMMENT:
+                    case CPPCOMMENT:
+                        if (!cpp.getFeature(Feature.KEEPCOMMENTS)) {
+                            token = " ";
+                            break;
+                        }
+                    default:
+                        token = tok.getText();
+                        break;
+                }
+                idx = 0;
+            }
+            return true;
+        } catch (LexerException e) {
+            throw new IOException(String.valueOf(e), e);
+        }
+    }
+
+    @Override
+    public int read()
+            throws IOException {
+        if (!refill())
+            return -1;
+        return token.charAt(idx++);
+    }
+
+    /* XXX Very slow and inefficient. */
+    public int read(char cbuf[], int off, int len)
+            throws IOException {
+        if (token == null)
+            return -1;
+        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 {
+        cpp.close();
+        token = null;
+    }
+
+}