1 files changed, 81 insertions, 0 deletions
diff --git a/lib/antlr/src/InputBuffer.cpp b/lib/antlr/src/InputBuffer.cpp
new file mode 100644
index 00000000..c9eced7d
--- /dev/null
+++ b/lib/antlr/src/InputBuffer.cpp
@@ -0,0 +1,81 @@
+/* ANTLR Translator Generator
+ * Project led by Terence Parr at http://www.jGuru.com
+ * Software rights: http://www.antlr.org/license.html
+ *
+ * $Id$
+ */
+
+#include "antlr/config.hpp"
+#include "antlr/InputBuffer.hpp"
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+namespace antlr {
+#endif
+
+/** Ensure that the character buffer is sufficiently full */
+void InputBuffer::fill(unsigned int amount)
+{
+	syncConsume();
+	// Fill the buffer sufficiently to hold needed characters
+	while (queue.entries() < amount + markerOffset)
+	{
+		// Append the next character
+		queue.append(getChar());
+	}
+}
+
+/** get the current lookahead characters as a string
+ * @warning it may treat 0 and EOF values wrong
+ */
+ANTLR_USE_NAMESPACE(std)string InputBuffer::getLAChars( void ) const
+{
+	ANTLR_USE_NAMESPACE(std)string ret;
+
+	for(unsigned int i = markerOffset; i < queue.entries(); i++)
+		ret += queue.elementAt(i);
+
+	return ret;
+}
+
+/** get the current marked characters as a string
+ * @warning it may treat 0 and EOF values wrong
+ */
+ANTLR_USE_NAMESPACE(std)string InputBuffer::getMarkedChars( void ) const
+{
+	ANTLR_USE_NAMESPACE(std)string ret;
+
+	for(unsigned int i = 0; i < markerOffset; i++)
+		ret += queue.elementAt(i);
+
+	return ret;
+}
+
+/** Return an integer marker that can be used to rewind the buffer to
+ * its current state.
+ */
+unsigned int InputBuffer::mark()
+{
+	syncConsume();
+	nMarkers++;
+	return markerOffset;
+}
+
+/** Rewind the character buffer to a marker.
+ * @param mark Marker returned previously from mark()
+ */
+void InputBuffer::rewind(unsigned int mark)
+{
+	syncConsume();
+	markerOffset = mark;
+	nMarkers--;
+}
+
+unsigned int InputBuffer::entries() const
+{
+	//assert(queue.entries() >= markerOffset);
+	return queue.entries() - markerOffset;
+}
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+}
+#endif