Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / types / TVar.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/types/TVar.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/types/TVar.java
new file mode 100644 (file)
index 0000000..1fca6c5
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/types/TVar.java
@@ -0,0 +1,142 @@
+package org.simantics.scl.compiler.types;
+
+import gnu.trove.map.hash.THashMap;
+import gnu.trove.map.hash.TObjectIntHashMap;
+import gnu.trove.set.hash.THashSet;
+
+import java.util.ArrayList;
+
+import org.simantics.scl.compiler.environment.Environment;
+import org.simantics.scl.compiler.internal.types.TypeHashCodeContext;
+import org.simantics.scl.compiler.internal.types.ast.TVarAst;
+import org.simantics.scl.compiler.internal.types.ast.TypeAst;
+import org.simantics.scl.compiler.types.exceptions.KindUnificationException;
+import org.simantics.scl.compiler.types.kinds.KMetaVar;
+import org.simantics.scl.compiler.types.kinds.Kind;
+import org.simantics.scl.compiler.types.kinds.Kinds;
+import org.simantics.scl.compiler.types.util.Polarity;
+import org.simantics.scl.compiler.types.util.TypeUnparsingContext;
+
+
+public class TVar extends Type {
+    public static final TVar[] EMPTY_ARRAY = new TVar[0];
+    
+    private Kind kind;
+    
+    TVar(Kind kind) {
+        this.kind = kind;
+    }
+    
+    public Kind getKind() {
+        if(kind instanceof KMetaVar)
+            kind = Kinds.canonical(kind);
+        return kind;
+    }
+
+    @Override
+    public Type replace(TVar var, Type replacement) {
+        if(this == var)
+            return replacement;
+        else
+            return this;
+    }
+
+    @Override
+    public TypeAst toTypeAst(TypeUnparsingContext context) {
+        return new TVarAst(context.getName(this));
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+        while(obj instanceof TMetaVar) {
+            TMetaVar metaVar = (TMetaVar)obj;
+            if(metaVar.ref == null)
+                return false;
+            else
+                obj = metaVar.ref;
+        }
+        return this == obj;
+    }
+    
+    @Override
+    public int hashCode() {
+        return System.identityHashCode(this);
+    }
+    
+    @Override
+    public void updateHashCode(TypeHashCodeContext context) {
+        TObjectIntHashMap<TVar> varHashCode = context.getVarHashCode();
+        if(varHashCode != null && varHashCode.containsKey(this))
+            context.append(varHashCode.get(this));
+        else
+            context.append(System.identityHashCode(this));
+    }
+
+    @Override
+    public void collectFreeVars(ArrayList<TVar> vars) {
+        if(!vars.contains(this))
+            vars.add(this);
+    }
+    
+    @Override
+    public void collectMetaVars(ArrayList<TMetaVar> vars) {
+    }
+    
+    @Override
+    public void collectMetaVars(THashSet<TMetaVar> vars) {
+    }
+    
+    @Override
+    public void collectEffectMetaVars(ArrayList<TMetaVar> vars) {
+    }
+
+    @Override
+    public boolean isGround() {
+        return false;
+    }
+
+       public Kind inferKind(Environment context) throws KindUnificationException {
+           if(kind == null)
+               kind = Kinds.metaVar();
+        return kind;
+    }
+
+    @Override
+    public boolean containsMetaVars() {
+        return false;
+    }
+
+    @Override
+    public void toName(TypeUnparsingContext context, StringBuilder b) {
+        b.append(context.getName(this));
+    }
+    
+    @Override
+    public int getClassId() {
+        return VAR_ID;
+    }
+    
+    @Override
+    public boolean contains(TMetaVar other) {
+        return false;
+    }
+
+    @Override
+    public Type convertMetaVarsToVars() {
+        return this;
+    }
+
+    @Override
+    public void addPolarity(Polarity polarity) {
+    }
+
+    @Override
+    public Type head() {
+        return this;
+    }
+
+    @Override
+    public Type copySkeleton(THashMap<TMetaVar, TMetaVar> metaVarMap) {
+        return this;
+    }
+}