Warn for existential variables in head pattern referred only once

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / elaboration / contexts / TranslationContext.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/contexts/TranslationContext.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/contexts/TranslationContext.java
index d8346f41f5e889fbc66437a1f9be10a1a3ad803c..e0c256599195097c1e0a5d3650334deebebf4265 100644 (file)
--- a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/contexts/TranslationContext.java
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/contexts/TranslationContext.java
@@ -76,6 +76,8 @@ public class TranslationContext extends TypeTranslationContext implements Enviro
     TIntArrayList chrConstraintFrames = new TIntArrayList();
     ArrayList<CHRConstraintEntry> chrConstraintEntries = new ArrayList<CHRConstraintEntry>();
     
+    private THashSet<Expression> expandedFromWildcard;
+    
     public CHRRuleset currentRuleset;
     
     public ModuleDebugInfo moduleDebugInfo;
@@ -141,7 +143,7 @@ public class TranslationContext extends TypeTranslationContext implements Enviro
             variable = new Variable(name);
             variables.put(name, variable);
             existentialFrame.variables.add(name);
-            return new EVariable(variable);
+            return new EVariable(location, variable);
         }
         case '_': {
             if(name.length()==1) {
@@ -583,7 +585,29 @@ public class TranslationContext extends TypeTranslationContext implements Enviro
         return Environments.getRuleset(environment, name);
     }
 
+    /**
+     * Tells that new existential variables are no longer allowed in this context.
+     */
     public void disallowNewExistentials() {
         getCurrentExistentialFrame().disallowNewExistentials = true;
     }
+
+    /**
+     * Marks that the expression is a result of expanding .. wildcard pattern in records.
+     */
+    public void addExpandedFromWildcard(Expression expression) {
+        if(expandedFromWildcard == null)
+            expandedFromWildcard = new THashSet<>();
+        expandedFromWildcard.add(expression);
+    }
+    
+    /**
+     * Asks if the expression is a result of expanding .. wildcard pattern in records.
+     */
+    public boolean isExpandedFromWildcard(Expression expression) {
+        if(expandedFromWildcard == null)
+            return false;
+        else
+            return expandedFromWildcard.contains(expression);
+    }
 }