AstBuilder: switch to global decls

params.toml

@@ -26,8 +26,8 @@ verify_config = true
     [statements.gen_global_decl]
         gen_boolean = 0.0
         gen_character = 0.0
-        gen_integer = 0.0
+        gen_integer = 0.5
-        gen_real = 0.0
+        gen_real = 0.5
         gen_tuple = 0.0
 
     [statements.gen_if_statement]

src/ast_builder.rs

@@ -59,15 +59,15 @@ impl AstBuilder {
                 let typedef = self.gen_typedef();
                 self.ast.push(typedef);
             } else {
-                let decl = self.gen_decl();
+                let decl = self.gen_global_decl();
                 self.ast.push(decl);
             }
         }
     }
 
-    fn gen_decl(&mut self) -> Stat {
+    fn gen_global_decl(&mut self) -> Stat {
         let mut p: f64 = self.rng.gen();
-        let ps = &self.params.statements.gen_decl;
+        let ps = &self.params.statements.gen_global_decl;
 
         let t: BaseType;
         let assn: Expr;

src/params.rs

@@ -176,9 +176,20 @@ toml_struct!{
 
 impl GenGlobalDecl {
     fn verify(&self) -> Result<(), String> {
+        let sum_type = self.gen_boolean
+            + self.gen_character
+            + self.gen_integer
+            + self.gen_real
+            + self.gen_tuple;
+
+
+        if (sum_type - 1.0).abs() > f64::EPSILON {
+            Err(format!("statements.gen_global_decl probability sum for types is = {}", sum_type))
+        } else {
             Ok(())
         }
     }
+}
 
 toml_struct!{
     struct GenIfStatement {