bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/list/ListThen.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.Expression;
   7 import org.simantics.scl.compiler.elaboration.expressions.Variable;
   8 import org.simantics.scl.compiler.errors.Locations;
   9 import org.simantics.scl.compiler.types.TMetaVar;
  10 import org.simantics.scl.compiler.types.Type;
  11 import org.simantics.scl.compiler.types.Types;
  12 import org.simantics.scl.compiler.types.exceptions.UnificationException;
  13 import org.simantics.scl.compiler.types.kinds.Kinds;
  14
  15 import gnu.trove.map.hash.TObjectIntHashMap;
  16 import gnu.trove.set.hash.THashSet;
  17 import gnu.trove.set.hash.TIntHashSet;
  18
  19 public class ListThen extends ListQualifier {
  20     public ListQualifier left;
  21     public Expression transformer;
  22     public Expression by; // optional
  23     TMetaVar cType;
  24
  25     public ListThen(Expression transformer, Expression by) {
  26         this.transformer = transformer;
  27         this.by = by;
  28     }
  29
  30     public void setLeft(ListQualifier inner) {
  31         this.left = inner;
  32     }
  33
  34     @Override
  35     public void checkType(TypingContext context) {
  36         left.checkType(context);
  37
  38         cType = Types.metaVar(Kinds.STAR);
  39         Type transformerType = Types.function(Types.list(cType), Types.list(cType));
  40         if(by != null) {
  41             by = by.checkType(context, Types.metaVar(Kinds.STAR));
  42             transformerType = Types.function(Types.function(cType, by.getType()), transformerType);
  43         }
  44         transformer = transformer.checkType(context, transformerType);
  45         if(!(Types.canonical(cType) instanceof TMetaVar)) {
  46             context.getErrorLog().log(location, "Transformation function must be generic on list elements.");
  47         }
  48     }
  49
  50     @Override
  51     public void collectVars(TObjectIntHashMap<Variable> allVars,
  52             TIntHashSet vars) {
  53         left.collectVars(allVars, vars);
  54         transformer.collectVars(allVars, vars);
  55         if(by != null)
  56             by.collectVars(allVars, vars);
  57     }
  58
  59     @Override
  60     public void collectFreeVariables(THashSet<Variable> vars) {
  61         left.collectFreeVariables(vars);
  62         transformer.collectFreeVariables(vars);
  63         if(by != null)
  64             by.collectFreeVariables(vars);
  65     }
  66
  67     @Override
  68     public CompiledQualifier compile(SimplificationContext context) {
  69         CompiledQualifier q = left.compile(context);
  70
  71         try {
  72             Types.unify(cType, q.pattern.getType());
  73         } catch (UnificationException e) {
  74             context.getErrorLog().log(location, "Transformation function must be generic on list elements.");
  75         }
  76
  77         if(by == null)
  78             q.value = context.apply(transformer, q.value);
  79         else
  80             q.value = context.apply(transformer, context.lambda(q.pattern.copy(), by), q.value);
  81         return q;
  82     }
  83
  84     @Override
  85     public void resolve(TranslationContext context) {
  86         transformer = transformer.resolve(context);
  87         left.resolve(context);
  88         if(by != null)
  89             by = by.resolve(context);
  90     }
  91
  92     @Override
  93     public void setLocationDeep(long loc) {
  94         if(location == Locations.NO_LOCATION) {
  95             location = loc;
  96             left.setLocationDeep(loc);
  97             transformer.setLocationDeep(loc);
  98             if(by != null)
  99                 by.setLocationDeep(loc);
 100         }
 101     }
 102
 103     @Override
 104     public void accept(ListQualifierVisitor visitor) {
 105         visitor.visit(this);
 106     }
 107
 108     @Override
 109     public ListQualifier accept(ListQualifierTransformer transformer) {
 110         return transformer.transform(this);
 111     }
 112 }