1 files changed, 77 insertions, 0 deletions
diff --git a/ninja/src/graphviz.cc b/ninja/src/graphviz.cc
new file mode 100644
index 00000000000..8354a2277a6
--- /dev/null
+++ b/ninja/src/graphviz.cc
@@ -0,0 +1,77 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "graphviz.h"
+
+#include <stdio.h>
+
+#include "graph.h"
+
+void GraphViz::AddTarget(Node* node) {
+  if (visited_nodes_.find(node) != visited_nodes_.end())
+    return;
+
+  printf("\"%p\" [label=\"%s\"]\n", node, node->path().c_str());
+  visited_nodes_.insert(node);
+
+  Edge* edge = node->in_edge();
+
+  if (!edge) {
+    // Leaf node.
+    // Draw as a rect?
+    return;
+  }
+
+  if (visited_edges_.find(edge) != visited_edges_.end())
+    return;
+  visited_edges_.insert(edge);
+
+  if (edge->inputs_.size() == 1 && edge->outputs_.size() == 1) {
+    // Can draw simply.
+    // Note extra space before label text -- this is cosmetic and feels
+    // like a graphviz bug.
+    printf("\"%p\" -> \"%p\" [label=\" %s\"]\n",
+           edge->inputs_[0], edge->outputs_[0], edge->rule_->name().c_str());
+  } else {
+    printf("\"%p\" [label=\"%s\", shape=ellipse]\n",
+           edge, edge->rule_->name().c_str());
+    for (vector<Node*>::iterator out = edge->outputs_.begin();
+         out != edge->outputs_.end(); ++out) {
+      printf("\"%p\" -> \"%p\"\n", edge, *out);
+    }
+    for (vector<Node*>::iterator in = edge->inputs_.begin();
+         in != edge->inputs_.end(); ++in) {
+      const char* order_only = "";
+      if (edge->is_order_only(in - edge->inputs_.begin()))
+        order_only = " style=dotted";
+      printf("\"%p\" -> \"%p\" [arrowhead=none%s]\n", (*in), edge, order_only);
+    }
+  }
+
+  for (vector<Node*>::iterator in = edge->inputs_.begin();
+       in != edge->inputs_.end(); ++in) {
+    AddTarget(*in);
+  }
+}
+
+void GraphViz::Start() {
+  printf("digraph ninja {\n");
+  printf("rankdir=\"LR\"\n");
+  printf("node [fontsize=10, shape=box, height=0.25]\n");
+  printf("edge [fontsize=10]\n");
+}
+
+void GraphViz::Finish() {
+  printf("}\n");
+}