From 29fb671e69f90ad3b04c6fa8d746caf857f89e77 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Tue, 22 Sep 2026 11:25:05 -0700
Subject: Add shared graph viewer to all chapters

---
 .../main/java/com/seaofnodes/simple/Parser.java    |  3 ++
 .../simple/print/SimpleGraphAdapter.java           | 45 ++++++++++++++++++++++
 .../simple/print/SimpleGraphObserver.java          | 35 +++++++++++++++++
 3 files changed, 83 insertions(+)
 create mode 100644 chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphAdapter.java
 create mode 100644 chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphObserver.java

(limited to 'chapter01/src/main')

diff --git a/chapter01/src/main/java/com/seaofnodes/simple/Parser.java b/chapter01/src/main/java/com/seaofnodes/simple/Parser.java
index 806c985d..c2ea3734 100644
--- a/chapter01/src/main/java/com/seaofnodes/simple/Parser.java
+++ b/chapter01/src/main/java/com/seaofnodes/simple/Parser.java
@@ -11,6 +11,9 @@ import com.seaofnodes.simple.node.*;
  */
 public class Parser {
 
+    public int pos() { return _lexer._position; }
+
+
     /**
      * A Global Static, unique to each compilation.  This is a public, so we
      * can make constants everywhere without having to thread the StartNode
diff --git a/chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphAdapter.java b/chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphAdapter.java
new file mode 100644
index 00000000..59275832
--- /dev/null
+++ b/chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphAdapter.java
@@ -0,0 +1,45 @@
+package com.seaofnodes.simple.print;
+
+import com.seaofnodes.graph.GraphAdapter;
+import com.seaofnodes.graph.GraphSnapshot;
+import com.seaofnodes.graph.GraphSnapshot.*;
+import com.seaofnodes.simple.node.*;
+import com.seaofnodes.simple.node.Node;
+import java.util.ArrayList;
+
+/** Chapter 1's view of the IR; browser, transport and layout are shared. */
+public class SimpleGraphAdapter extends GraphAdapter<Node> {
+    @Override protected boolean dead(Node n) { return false; }
+    @Override protected int id(Node n) { return n._nid; }
+    @Override protected int nIns(Node n) { return n.nIns(); }
+    @Override protected Node in(Node n, int idx) { return n.in(idx); }
+    @Override protected int nOuts(Node n) { return n.nOuts(); }
+    @Override protected Node out(Node n, int idx) { return n._outputs.get(idx); }
+
+    private ArrayList<Edge> edges(Node n) {
+        var edges = new ArrayList<Edge>();
+        for( int i = 0; i < n.nIns(); i++ ) {
+            String name = null;
+            edges.add(new Edge(i, ref(n.in(i)), role(n, i), name));
+        }
+        return edges;
+    }
+
+    @Override protected GraphSnapshot.Node desc(Node n) {
+        Projection proj = null;
+        String label = n instanceof ConstantNode c ? Long.toString(c._value) : n.getClass().getSimpleName();
+        return new GraphSnapshot.Node(n._nid, label == null ? n.getClass().getSimpleName() : label,
+                                      null, kind(n), edges(n), proj);
+    }
+
+    private Kind kind(Node n) {
+        if( n instanceof StartNode ) return Kind.CTRL;
+        return n.isCFG() ? Kind.CTRL : Kind.DATA;
+    }
+
+    private Role role(Node n, int i) {
+        if( n instanceof ConstantNode ) return Role.ASSOC;
+        if( i == 0 ) return Role.CTRL;
+        return Role.DATA;
+    }
+}
diff --git a/chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphObserver.java b/chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphObserver.java
new file mode 100644
index 00000000..1c78e4dd
--- /dev/null
+++ b/chapter01/src/main/java/com/seaofnodes/simple/print/SimpleGraphObserver.java
@@ -0,0 +1,35 @@
+package com.seaofnodes.simple.print;
+
+import com.seaofnodes.graph.GraphCapture;
+import com.seaofnodes.graph.GraphViewer;
+import com.seaofnodes.simple.Parser;
+import com.seaofnodes.simple.node.Node;
+import java.util.ArrayList;
+import java.io.IOException;
+
+/** Chapter 1's compilation context; capture and event bookkeeping are shared. */
+public class SimpleGraphObserver extends GraphCapture<Node> {
+    private Parser _parser;
+    private Node _ret;
+    private String _phase;
+    public SimpleGraphObserver() { super(new SimpleGraphAdapter()); }
+    public static void main(String[] args) throws IOException {
+        GraphViewer.run(new SimpleGraphObserver());
+    }
+    @Override protected void compile(String src) {
+        _parser = new Parser(src);
+        _phase = "Parse";
+        _ret = _parser.parse();
+        phase(_phase);
+    }
+    @Override protected String phase() { return _phase; }
+    @Override protected int pos() { return "Parse".equals(_phase) ? _parser.pos() : -1; }
+    @Override protected void detach() {
+        _parser = null;
+        _ret = null;
+    }
+    @Override protected void roots(ArrayList<Node> roots) {
+        roots.add(Parser.START);
+        roots.add(_ret);
+    }
+}
-- 
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