Security-55471.tar.gz

[apple/security.git] / libsecurity_codesigning / antlr2 / src / InputBuffer.cpp

diff --git a/libsecurity_codesigning/antlr2/src/InputBuffer.cpp b/libsecurity_codesigning/antlr2/src/InputBuffer.cpp
new file mode 100644 (file)
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+++ b/libsecurity_codesigning/antlr2/src/InputBuffer.cpp
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+/* ANTLR Translator Generator
+ * Project led by Terence Parr at http://www.jGuru.com
+ * Software rights: http://www.antlr.org/license.html
+ *
+ * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/src/InputBuffer.cpp#2 $
+ */
+
+#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 (unsigned int)queue.entries() - markerOffset;
+}
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+}
+#endif