ccppjava
diff --git a/‎nathansununiversity_03.js‎
Lines changed: 63 additions & 0 deletions b/‎nathansununiversity_03.js‎
Lines changed: 63 additions & 0 deletions
@@ -75,3 +75,66 @@ assert_eq(parse("Gray dog"), undefined,
     "don't parse Gray dog");
 
 // page 4
+
+// first attempt
+// this solution is not a solution, it just make test pass
+// need to think about several layer nested situation
+// need to recursively parse the expression
+// now using:
+// https://github.com/dannycoates/node-inspector
+// for debug node/pegjs
+// $ node --debug-brk your/short/node/script.js
+// $ node-inspector &
+// # open chrome/safari:
+// http://192.168.77.250:8080/debug?port=5858
+
+start =
+    expression
+
+expression = 
+    atom
+  / listatom
+  / nestedlist
+    
+validchar
+    = [0-9a-zA-Z_?!+\-=@#$%^&*/.]
+
+atom =
+    chars:validchar+
+        { return chars.join(""); }
+     
+listatom = 
+    "(" space* natom:atom satom:spaceatom* space* ")"
+        { if (satom && satom.length) {
+              satom.unshift(natom);
+              return satom;
+          } else {
+              return [natom];
+          }
+        }
+
+nestedlist = 
+    "(" space* natom1:atom* satom1:spaceatom* space* latom1:listatom* space* ")"
+        {
+            var result = [];
+            if (natom1 && natom1.length) {
+                result = result.concat(natom1);
+            }
+            
+            if (satom1 && satom1.length) {
+                result = result.concat(satom1);
+            }
+            
+            if (latom1 && latom1.length) {
+                result = result.concat(latom1);
+            }
+            
+            return result;
+        }
+
+space =
+    " "
+    
+spaceatom = 
+    space natom:atom
+        { return natom; }