1 files changed, 68 insertions, 0 deletions
diff --git a/var.cc b/var.cc
new file mode 100644
index 0000000..9bac8a2
--- /dev/null
+++ b/var.cc
@@ -0,0 +1,68 @@
+#include "var.h"
+
+#include "value.h"
+
+UndefinedVar kUndefinedBuf;
+UndefinedVar* kUndefined = &kUndefinedBuf;
+
+Var::Var() {
+}
+
+Var::~Var() {
+}
+
+SimpleVar::SimpleVar(shared_ptr<string> v, const char* origin)
+    : v_(v), origin_(origin) {
+}
+
+void SimpleVar::Eval(Evaluator*, string* s) const {
+  *s += *v_;
+}
+
+string SimpleVar::DebugString() const {
+  return *v_;
+}
+
+RecursiveVar::RecursiveVar(Value* v, const char* origin)
+    : v_(v), origin_(origin) {
+}
+
+void RecursiveVar::Eval(Evaluator* ev, string* s) const {
+  v_->Eval(ev, s);
+}
+
+string RecursiveVar::DebugString() const {
+  return v_->DebugString();
+}
+
+UndefinedVar::UndefinedVar() {}
+
+void UndefinedVar::Eval(Evaluator*, string*) const {
+  // Nothing to do.
+}
+
+string UndefinedVar::DebugString() const {
+  return "*undefined*";
+}
+
+Vars::~Vars() {
+  for (auto p : *this) {
+    delete p.second;
+  }
+}
+
+Var* Vars::Lookup(StringPiece name) const {
+  auto found = find(name);
+  if (found == end())
+    return kUndefined;
+  return found->second;
+}
+
+void Vars::Assign(StringPiece name, Var* v) {
+  auto p = insert(make_pair(name, v));
+  if (!p.second) {
+    if (p.first->second->IsDefined())
+      delete p.first->second;
+    p.first->second = v;
+  }
+}