From 8775c4d1e3630230dcea202f2d1647e56a81c20f Mon Sep 17 00:00:00 2001
From: Robert Iannucci <robbie@rail.com>
Date: Mon, 1 Oct 2012 13:51:00 -0700
Subject: Pull out base changes to state

---
 src/state.cc | 17 ++++++++++++++++-
 src/state.h  | 25 ++++++++++++++++++++++++-
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/src/state.cc b/src/state.cc
index 4c7168b..0697e48 100644
--- a/src/state.cc
+++ b/src/state.cc
@@ -22,10 +22,12 @@
 #include "metrics.h"
 #include "util.h"
 
+const Pool State::kDefaultPool("", 0);
 const Rule State::kPhonyRule("phony");
 
 State::State() {
   AddRule(&kPhonyRule);
+  AddPool(&kDefaultPool);
 }
 
 void State::AddRule(const Rule* rule) {
@@ -40,7 +42,20 @@ const Rule* State::LookupRule(const string& rule_name) {
   return i->second;
 }
 
-Edge* State::AddEdge(const Rule* rule) {
+void State::AddPool(const Pool* pool) {
+  assert(LookupPool(pool->name()) == NULL);
+  pools_[pool->name()] = pool;
+}
+
+const Pool* State::LookupPool(const string& pool_name) {
+  map<string, const Pool*>::iterator i = pools_.find(pool_name);
+  if (i == pools_.end())
+    return NULL;
+  return i->second;
+}
+
+Edge* State::AddEdge(const Rule* rule, const Pool* pool) {
+  // FIXME(iannucci): do something with pool
   Edge* edge = new Edge();
   edge->rule_ = rule;
   edge->env_ = &bindings_;
diff --git a/src/state.h b/src/state.h
index 026acf3..38fc74f 100644
--- a/src/state.h
+++ b/src/state.h
@@ -27,16 +27,36 @@ struct Edge;
 struct Node;
 struct Rule;
 
+/// A pool for delayed edges
+struct Pool {
+  explicit Pool(const string& name, int depth)
+    : name_(name), depth_(depth) { }
+
+  // A depth of 0 is infinite
+  bool isValid() const { return depth_ >= 0; }
+  int depth() const { return depth_; }
+  string name() const { return name_; }
+
+private:
+  string name_;
+
+  int depth_;
+};
+
 /// Global state (file status, loaded rules) for a single run.
 struct State {
   static const Rule kPhonyRule;
+  static const Pool kDefaultPool;
 
   State();
 
   void AddRule(const Rule* rule);
   const Rule* LookupRule(const string& rule_name);
 
-  Edge* AddEdge(const Rule* rule);
+  void AddPool(const Pool* pool);
+  const Pool* LookupPool(const string& pool_name);
+
+  Edge* AddEdge(const Rule* rule, const Pool* pool);
 
   Node* GetNode(StringPiece path);
   Node* LookupNode(StringPiece path);
@@ -65,6 +85,9 @@ struct State {
   /// All the rules used in the graph.
   map<string, const Rule*> rules_;
 
+  /// All the pools used in the graph.
+  map<string, const Pool*> pools_;
+
   /// All the edges of the graph.
   vector<Edge*> edges_;
 
-- 
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