Add count-vars example

src/dreammaker/examples/count-vars.rs

@@ -0,0 +1,29 @@
+//! Print total number of `var` declarations and overrides in a project.
+
+extern crate dreammaker as dm;
+
+fn main() {
+    let context = dm::Context::default();
+    let env = dm::detect_environment_default()
+        .expect("error detecting .dme")
+        .expect("no .dme found");
+    let pp = dm::preprocessor::Preprocessor::new(&context, env)
+        .expect("i/o error opening .dme");
+    let indents = dm::indents::IndentProcessor::new(&context, pp);
+    let mut parser = dm::parser::Parser::new(&context, indents);
+    parser.enable_procs();
+    let ot = parser.parse_object_tree();
+
+    let mut decls = 0;
+    let mut overrides = 0;
+    ot.root().recurse(&mut |ty: dm::objtree::TypeRef| {
+        for v in ty.vars.values() {
+            if v.declaration.is_some() {
+                decls += 1;
+            } else {
+                overrides += 1;
+            }
+        }
+    });
+    println!("decls: {}\noverrides: {}\ntotal: {}", decls, overrides, decls + overrides);
+}