1 files changed, 74 insertions, 0 deletions
diff --git a/src/scope.cc b/src/scope.cc
new file mode 100644
index 00000000..64736ca3
--- /dev/null
+++ b/src/scope.cc
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2003-2009, John Wiegley.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of New Artisans LLC nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <system.hh>
+
+#include "scope.h"
+
+namespace ledger {
+
+scope_t * scope_t::default_scope = NULL;
+
+void symbol_scope_t::define(const symbol_t::kind_t kind,
+			    const string& name, expr_t::ptr_op_t def)
+{
+  DEBUG("scope.symbols", "Defining '" << name << "' = " << def);
+
+  if (! symbols)
+    symbols = symbol_map();
+
+  std::pair<symbol_map::iterator, bool> result
+    = symbols->insert(symbol_map::value_type(symbol_t(kind, name, def), def));
+  if (! result.second) {
+    symbol_map::iterator i = symbols->find(symbol_t(kind, name));
+    assert(i != symbols->end());
+    symbols->erase(i);
+
+    result = symbols->insert(symbol_map::value_type(symbol_t(kind, name, def),
+						    def));
+    if (! result.second)
+      throw_(compile_error,
+	     _("Redefinition of '%1' in the same scope") << name);
+  }
+}
+
+expr_t::ptr_op_t symbol_scope_t::lookup(const symbol_t::kind_t kind,
+					const string& name)
+{
+  if (symbols) {
+    symbol_map::const_iterator i = symbols->find(symbol_t(kind, name));
+    if (i != symbols->end())
+      return (*i).second;
+  }
+  return child_scope_t::lookup(kind, name);
+}
+
+} // namespace ledger