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 java.util.Set;
   4
   5 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
   6 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
   7 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
   8 import org.simantics.scl.compiler.elaboration.expressions.Case;
   9 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
  10 import org.simantics.scl.compiler.elaboration.expressions.Expression;
  11 import org.simantics.scl.compiler.elaboration.expressions.Variable;
  12 import org.simantics.scl.compiler.errors.Locations;
  13
  14 import gnu.trove.map.hash.TObjectIntHashMap;
  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 collectVars(TObjectIntHashMap<Variable> allVars,
  34             TIntHashSet vars) {
  35         value.collectVars(allVars, vars);
  36     }
  37
  38     @Override
  39     public CompiledQualifier compile(SimplificationContext context) {
  40         if(pattern instanceof EVariable)
  41             return new CompiledQualifier(context.singletonList(value), pattern);
  42         else {
  43             Set<Variable> variables = pattern.getFreeVariables();
  44             Variable[] variableArray = variables.toArray(new Variable[variables.size()]);
  45             Expression[] variableExps = new Expression[variableArray.length];
  46             for(int i=0;i<variableArray.length;++i)
  47                 variableExps[i] = new EVariable(variableArray[i]);
  48             Expression newPattern = context.tuple(variableExps);
  49
  50             EVariable blank = context.blank();
  51             blank.getVariable().setType(pattern.getType());
  52
  53             return new CompiledQualifier(
  54                 context.match(value,
  55                         new Case(pattern, context.singletonList(newPattern.copy())),
  56                         new Case(blank, context.emptyList(newPattern.getType()))
  57                         ),
  58                         newPattern
  59                     );
  60         }
  61     }
  62
  63     @Override
  64     public void resolve(TranslationContext context) {
  65         value = value.resolve(context);
  66         pattern = pattern.resolveAsPattern(context);
  67     }
  68
  69     @Override
  70     public void setLocationDeep(long loc) {
  71         if(location == Locations.NO_LOCATION) {
  72             location = loc;
  73             pattern.setLocationDeep(loc);
  74             value.setLocationDeep(loc);
  75         }
  76     }
  77
  78     @Override
  79     public void accept(ListQualifierVisitor visitor) {
  80         visitor.visit(this);
  81     }
  82
  83     @Override
  84     public ListQualifier accept(ListQualifierTransformer transformer) {
  85         return transformer.transform(this);
  86     }
  87 }