summaryrefslogtreecommitdiffstats
path: root/lib/antlr/src/TokenStreamSelector.cpp
diff options
context:
space:
mode:
authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commit114a878c64ce6f8223cfd22d76a20eb16d177e5e (patch)
treeacaf47eb0fa12142d3896416a69e74cbf5a72242 /lib/antlr/src/TokenStreamSelector.cpp
downloadtdevelop-114a878c64ce6f8223cfd22d76a20eb16d177e5e.tar.gz
tdevelop-114a878c64ce6f8223cfd22d76a20eb16d177e5e.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdevelop@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
Diffstat (limited to 'lib/antlr/src/TokenStreamSelector.cpp')
-rw-r--r--lib/antlr/src/TokenStreamSelector.cpp107
1 files changed, 107 insertions, 0 deletions
diff --git a/lib/antlr/src/TokenStreamSelector.cpp b/lib/antlr/src/TokenStreamSelector.cpp
new file mode 100644
index 00000000..602e50dc
--- /dev/null
+++ b/lib/antlr/src/TokenStreamSelector.cpp
@@ -0,0 +1,107 @@
+/* ANTLR Translator Generator
+ * Project led by Terence Parr at http://www.jGuru.com
+ * Software rights: http://www.antlr.org/license.html
+ *
+ * $Id$
+ */
+#include "antlr/TokenStreamSelector.hpp"
+#include "antlr/TokenStreamRetryException.hpp"
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+namespace antlr {
+#endif
+
+/** A token stream MUX (multiplexor) knows about n token streams
+ * and can multiplex them onto the same channel for use by token
+ * stream consumer like a parser. This is a way to have multiple
+ * lexers break up the same input stream for a single parser.
+ * Or, you can have multiple instances of the same lexer handle
+ * multiple input streams; this works great for includes.
+ */
+
+TokenStreamSelector::TokenStreamSelector()
+: input(0)
+{
+}
+
+TokenStreamSelector::~TokenStreamSelector()
+{
+}
+
+void TokenStreamSelector::addInputStream(TokenStream* stream, const ANTLR_USE_NAMESPACE(std)string& key)
+{
+ inputStreamNames[key] = stream;
+}
+
+TokenStream* TokenStreamSelector::getCurrentStream() const
+{
+ return input;
+}
+
+TokenStream* TokenStreamSelector::getStream(const ANTLR_USE_NAMESPACE(std)string& sname) const
+{
+ inputStreamNames_coll::const_iterator i = inputStreamNames.find(sname);
+ if (i == inputStreamNames.end()) {
+ throw ANTLR_USE_NAMESPACE(std)string("TokenStream ")+sname+" not found";
+ }
+ return (*i).second;
+}
+
+RefToken TokenStreamSelector::nextToken()
+{
+ // keep looking for a token until you don't
+ // get a retry exception
+ for (;;) {
+ try {
+ return input->nextToken();
+ }
+ catch (TokenStreamRetryException&) {
+ // just retry "forever"
+ }
+ }
+}
+
+TokenStream* TokenStreamSelector::pop()
+{
+ TokenStream* stream = streamStack.top();
+ streamStack.pop();
+ select(stream);
+ return stream;
+}
+
+void TokenStreamSelector::push(TokenStream* stream)
+{
+ streamStack.push(input);
+ select(stream);
+}
+
+void TokenStreamSelector::push(const ANTLR_USE_NAMESPACE(std)string& sname)
+{
+ streamStack.push(input);
+ select(sname);
+}
+
+void TokenStreamSelector::retry()
+{
+ throw TokenStreamRetryException();
+}
+
+/** Set the stream without pushing old stream */
+void TokenStreamSelector::select(TokenStream* stream)
+{
+ input = stream;
+}
+
+void TokenStreamSelector::select(const ANTLR_USE_NAMESPACE(std)string& sname)
+{
+ inputStreamNames_coll::const_iterator i = inputStreamNames.find(sname);
+ if (i == inputStreamNames.end()) {
+ throw ANTLR_USE_NAMESPACE(std)string("TokenStream ")+sname+" not found";
+ }
+ input = (*i).second;
+}
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+}
+#endif
+