bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/list/ListAssignment.java

   1 package org.simantics.scl.compiler.elaboration.expressions.list;
   2
   3 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
   4 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
   5 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
   6 import org.simantics.scl.compiler.elaboration.expressions.Case;
   7 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
   8 import org.simantics.scl.compiler.elaboration.expressions.Expression;
   9 import org.simantics.scl.compiler.elaboration.expressions.Variable;
  10 import org.simantics.scl.compiler.errors.Locations;
  11 import org.simantics.scl.compiler.types.Type;
  12
  13 import gnu.trove.map.hash.TObjectIntHashMap;
  14 import gnu.trove.set.hash.THashSet;
  15 import gnu.trove.set.hash.TIntHashSet;
  16
  17 public class ListAssignment extends ListQualifier {
  18     public Expression pattern;
  19     public Expression value;
  20
  21     public ListAssignment(Expression pattern, Expression value) {
  22         this.pattern = pattern;
  23         this.value = value;
  24     }
  25
  26     @Override
  27     public void checkType(TypingContext context) {
  28         value = value.inferType(context);
  29         pattern.checkTypeAsPattern(context, value.getType());
  30     }
  31
  32     @Override
  33     public void collectRefs(TObjectIntHashMap<Object> allRefs,
  34             TIntHashSet refs) {
  35         value.collectRefs(allRefs, refs);
  36     }
  37
  38     @Override
  39     public void collectVars(TObjectIntHashMap<Variable> allVars,
  40             TIntHashSet vars) {
  41         value.collectVars(allVars, vars);
  42     }
  43
  44     @Override
  45     public void collectFreeVariables(THashSet<Variable> vars) {
  46         value.collectFreeVariables(vars);
  47         pattern.collectFreeVariables(vars);
  48     }
  49
  50     @Override
  51     public CompiledQualifier compile(SimplificationContext context) {
  52         if(pattern instanceof EVariable)
  53             return new CompiledQualifier(context.singletonList(value), pattern);
  54         else {
  55             THashSet<Variable> variables = pattern.getFreeVariables();
  56             Variable[] variableArray = variables.toArray(new Variable[variables.size()]);
  57             Expression[] variableExps = new Expression[variableArray.length];
  58             for(int i=0;i<variableArray.length;++i)
  59                 variableExps[i] = new EVariable(variableArray[i]);
  60             Expression newPattern = context.tuple(variableExps);
  61
  62             EVariable blank = context.blank();
  63             blank.getVariable().setType(pattern.getType());
  64
  65             return new CompiledQualifier(
  66                 context.match(value,
  67                         new Case(pattern, context.singletonList(newPattern.copy())),
  68                         new Case(blank, context.emptyList(newPattern.getType()))
  69                         ),
  70                         newPattern
  71                     );
  72         }
  73     }
  74
  75     @Override
  76     public void resolve(TranslationContext context) {
  77         value = value.resolve(context);
  78         pattern = pattern.resolveAsPattern(context);
  79     }
  80
  81     @Override
  82     public void collectEffects(THashSet<Type> effects) {
  83         pattern.collectEffects(effects);
  84         value.collectEffects(effects);
  85     }
  86
  87     @Override
  88     public void setLocationDeep(long loc) {
  89         if(location == Locations.NO_LOCATION) {
  90             location = loc;
  91             pattern.setLocationDeep(loc);
  92             value.setLocationDeep(loc);
  93         }
  94     }
  95
  96     @Override
  97     public void accept(ListQualifierVisitor visitor) {
  98         visitor.visit(this);
  99     }
 100
 101     @Override
 102     public ListQualifier accept(ListQualifierTransformer transformer) {
 103         return transformer.transform(this);
 104     }
 105 }