minor cleanup.

src/prolog/ast.rs

@@ -155,7 +155,7 @@ impl RegType {
     }
 }
 
-#[derive(Clone, Copy)]
+#[derive(PartialEq, Eq, Clone, Copy)]
 pub enum VarReg {
     ArgAndNorm(RegType, usize),
     Norm(RegType)
@@ -329,7 +329,7 @@ impl fmt::Display for Constant {
     }
 }
 
-#[derive(Clone)]
+#[derive(PartialEq, Eq, Clone)]
 pub enum Term {
     AnonVar,
     Clause(Cell<RegType>, TabledRc<Atom>, Vec<Box<Term>>, Option<Fixity>),
@@ -376,6 +376,19 @@ pub enum CompareNumberQT {
     Equal
 }
 
+impl CompareNumberQT {
+    fn name<'a>(self) -> &'a str {
+        match self {
+            CompareNumberQT::GreaterThan => ">",
+            CompareNumberQT::LessThan => "<",
+            CompareNumberQT::GreaterThanOrEqual => ">=",
+            CompareNumberQT::LessThanOrEqual => "=<",
+            CompareNumberQT::NotEqual => "=\\=",
+            CompareNumberQT::Equal => "=:="
+        }
+    }
+}
+
 // vars of predicate, toplevel offset.  Vec<Term> is always a vector
 // of vars (we get their adjoining cells this way).
 pub type JumpStub = Vec<Term>;
@@ -421,13 +434,12 @@ pub struct Rule {
     pub clauses: Vec<QueryTerm>
 }
 
-
-
 #[derive(Clone, Copy)]
 pub enum ClauseType<'a> {
     Arg,
     CallN,
     Catch,
+    CompareNumber(CompareNumberQT),
     Deep(Level, &'a Cell<RegType>, &'a TabledRc<Atom>, Option<Fixity>),
     Display,
     DuplicateTerm,
@@ -444,6 +456,7 @@ impl<'a> ClauseType<'a> {
             &ClauseType::Arg => "arg",
             &ClauseType::CallN => "call",
             &ClauseType::Catch => "catch",
+            &ClauseType::CompareNumber(qt) => qt.name(),
             &ClauseType::Display => "display",
             &ClauseType::Deep(_, _, name, _) => name.as_str(),
             &ClauseType::DuplicateTerm => "duplicate_term",

src/prolog/codegen.rs

@@ -100,23 +100,7 @@ impl<'a, TermMarker: Allocator<'a>> CodeGenerator<'a, TermMarker>
     {
         match self.marker.bindings().get(name) {
             Some(&VarData::Temp(_, t, _)) if t != 0 => RegType::Temp(t),
-            Some(&VarData::Perm(p)) if p != 0 =>
-               /* if let GenContext::Last(chunk_num) = term_loc {
-                    let mut target = Vec::new();
-
-                    self.marker.evacuate_arg(chunk_num, &mut target);
-
-                    self.marker.reset_arg(arity);
-                    self.marker.mark_var(name, Level::Shallow, vr, term_loc, &mut target);
-
-                    if !target.is_empty() {
-                        code.push(Line::Query(target));
-                    }
-
-                    vr.get().norm()
-                } else { */
-                    RegType::Perm(p),
-                //},
+            Some(&VarData::Perm(p)) if p != 0 => RegType::Perm(p),
             _ => {
                 let mut target = Vec::new();
 

src/prolog/iterators.rs

@@ -60,8 +60,11 @@ impl<'a> QueryIterator<'a> {
                 let state = TermIterState::Clause(0, ClauseType::Display, terms);
                 QueryIterator { state_stack: vec![state] }
             },
-            &QueryTerm::Inlined(InlinedQueryTerm::CompareNumber(_, ref terms))
-          | &QueryTerm::Is(ref terms) => {
+            &QueryTerm::Inlined(InlinedQueryTerm::CompareNumber(qt, ref terms)) => {                
+                let state = TermIterState::Clause(0, ClauseType::CompareNumber(qt), terms);
+                QueryIterator { state_stack: vec![state] }            
+            },
+            &QueryTerm::Is(ref terms) => {
                 let state = TermIterState::Clause(0, ClauseType::Is, terms);
                 QueryIterator { state_stack: vec![state] }
             },