1 files changed, 143 insertions, 0 deletions
diff --git a/src/expr.cc b/src/expr.cc
new file mode 100644
index 00000000..c59f8a57
--- /dev/null
+++ b/src/expr.cc
@@ -0,0 +1,143 @@
+/*
+ * 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 "expr.h"
+#include "parser.h"
+
+namespace ledger {
+
+void expr_t::parse(std::istream& in, const parse_flags_t& flags,
+		   const optional<string>& original_string)
+{
+  base_type::parse(in, flags, original_string);
+
+  parser_t parser;
+  ptr = parser.parse(in, flags, original_string);
+}
+
+void expr_t::compile(scope_t& scope)
+{
+  if (! compiled && ptr) {
+    ptr = ptr->compile(scope);
+    base_type::compile(scope);
+  }
+}
+
+value_t expr_t::real_calc(scope_t& scope)
+{
+  if (ptr) {
+    ptr_op_t locus;
+    try {
+      return ptr->calc(scope, &locus);
+    }
+    catch (const std::exception& err) {
+      if (locus) {
+	add_error_context(_("While evaluating value expression:"));
+	add_error_context(op_context(ptr, locus));
+
+	if (SHOW_INFO()) {
+	  add_error_context(_("The value expression tree was:"));
+	  std::ostringstream buf;
+	  ptr->dump(buf, 0);
+
+	  std::istringstream in(buf.str());
+	  std::ostringstream out;
+	  char linebuf[1024];
+	  bool first = true;
+	  while (in.good() && ! in.eof()) {
+	    in.getline(linebuf, 1023);
+	    std::streamsize len = in.gcount();
+	    if (len > 0) {
+	      if (first)
+		first = false;
+	      else
+		out << '\n';
+	      out << "  " << linebuf;
+	    }
+	  }
+	  add_error_context(out.str());
+	}
+      }
+      throw;
+    }
+  }
+  return NULL_VALUE;
+}
+
+bool expr_t::is_constant() const
+{
+  assert(compiled);
+  return ptr && ptr->is_value();
+}
+
+bool expr_t::is_function() const
+{
+  assert(compiled);
+  return ptr && ptr->is_function();
+}
+
+value_t& expr_t::constant_value()
+{
+  assert(is_constant());
+  return ptr->as_value_lval();
+}
+
+const value_t& expr_t::constant_value() const
+{
+  assert(is_constant());
+  return ptr->as_value();
+}
+
+expr_t::func_t& expr_t::get_function()
+{
+  assert(is_function());
+  return ptr->as_function_lval();
+}
+
+string expr_t::context_to_str() const
+{
+  return ptr ? op_context(ptr) : _("<empty expression>");
+}
+
+void expr_t::print(std::ostream& out) const
+{
+  if (ptr)
+    ptr->print(out);
+}
+
+void expr_t::dump(std::ostream& out) const
+{
+  if (ptr) ptr->dump(out, 0);
+}
+
+} // namespace ledger