bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/ERecord.java

   1 package org.simantics.scl.compiler.elaboration.expressions;
   2
   3 import org.simantics.scl.compiler.constants.SCLConstructor;
   4 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
   5 import org.simantics.scl.compiler.elaboration.expressions.records.FieldAssignment;
   6 import org.simantics.scl.compiler.elaboration.modules.SCLValue;
   7 import org.simantics.scl.compiler.environment.AmbiguousNameException;
   8 import org.simantics.scl.compiler.errors.Locations;
   9 import org.simantics.scl.compiler.internal.parsing.Token;
  10
  11 import gnu.trove.map.hash.THashMap;
  12
  13 public class ERecord extends ASTExpression {
  14
  15     Token constructor;
  16     FieldAssignment[] fields;
  17
  18     public ERecord(Token constructor, FieldAssignment[] fields) {
  19         this.constructor = constructor;
  20         this.fields = fields;
  21     }
  22
  23     @Override
  24     public Expression resolve(TranslationContext context) {
  25         return resolve(context, false);
  26     }
  27
  28     @Override
  29     public Expression resolveAsPattern(TranslationContext context) {
  30         return resolve(context, true);
  31     }
  32
  33     public Expression resolve(TranslationContext context, boolean asPattern) {
  34         SCLValue constructorValue;
  35         try {
  36             constructorValue = context.getEnvironment().getLocalNamespace().getValue(constructor.text);
  37         } catch (AmbiguousNameException e) {
  38             context.getErrorLog().log(constructor.location, e.getMessage());
  39             return new EError(constructor.location);
  40         }
  41         if(constructorValue == null) {
  42             context.getErrorLog().log(constructor.location, "Couldn't resolve the record constructor " + constructor.text + ".");
  43             return new EError(constructor.location);
  44         }
  45         if(!(constructorValue.getValue() instanceof SCLConstructor)) {
  46             context.getErrorLog().log(constructor.location, "Value " + constructor.text + " is not a record constructor.");
  47             return new EError(constructor.location);
  48         }
  49         String[] fieldNames = ((SCLConstructor)constructorValue.getValue()).recordFieldNames;
  50         if(fieldNames == null) {
  51             context.getErrorLog().log(constructor.location, "Value " + constructor.text + " is not a record constructor.");
  52             return new EError(constructor.location);
  53         }
  54         THashMap<String,FieldAssignment> recordMap = new THashMap<String,FieldAssignment>(fields.length);
  55         for(FieldAssignment field : fields) {
  56             if(field.value == null) {
  57                 String actualName = field.name;
  58                 if(actualName.charAt(0) == '?')
  59                         actualName = actualName.substring(1);
  60                 String bestMatch = null;
  61                 int bestMatchLength = 0;
  62                 for(int i=0;i<fieldNames.length;++i) {
  63                     String fieldName = fieldNames[i];
  64                     if(actualName.startsWith(fieldName) && fieldName.length() > bestMatchLength) {
  65                         bestMatch = fieldName;
  66                         bestMatchLength = fieldName.length();
  67                     }
  68                 }
  69                 if(bestMatch == null) {
  70                     context.getErrorLog().log(field.location, "Invalid shorthand field " + field.name + " is defined twice.");
  71                     return new EError(location);
  72                 }
  73                 field.value = new EVar(field.location, field.name);
  74                 field.name = bestMatch;
  75             }
  76             if(recordMap.put(field.name, field) != null) {
  77                 context.getErrorLog().log(field.location, "Field " + field.name + " is defined more than once.");
  78                 return new EError(location);
  79             }
  80         }
  81         Expression[] parameters = new Expression[fieldNames.length];
  82         boolean error = false;
  83         for(int i=0;i<fieldNames.length;++i) {
  84             FieldAssignment assignment = recordMap.remove(fieldNames[i]);
  85             if(assignment == null) {
  86                 if(asPattern) {
  87                     parameters[i] = Expressions.blank(null);
  88                 }
  89                 else {
  90                     context.getErrorLog().log(location, "Field " + fieldNames[i] + " not defined.");
  91                     error = true;
  92                 }
  93             }
  94             else
  95                 parameters[i] = asPattern
  96                         ? assignment.value.resolveAsPattern(context)
  97                         : assignment.value.resolve(context);
  98         }
  99         if(!recordMap.isEmpty()) {
 100             for(FieldAssignment field : recordMap.values())
 101                 context.getErrorLog().log(field.location, "Field " + field.name + " is not defined in the constructor.");
 102             error = true;
 103         }
 104         if(error)
 105             return new EError(location);
 106         else {
 107             EApply result = new EApply(new EConstant(constructorValue), parameters);
 108             result.setLocationDeep(location);
 109             return result;
 110         }
 111     }
 112
 113     @Override
 114     public void setLocationDeep(long loc) {
 115         if(location == Locations.NO_LOCATION) {
 116             location = loc;
 117             for(FieldAssignment field : fields)
 118                 if(field.value != null)
 119                     field.value.setLocationDeep(loc);
 120         }
 121     }
 122
 123     @Override
 124     public Expression accept(ExpressionTransformer transformer) {
 125         return transformer.transform(this);
 126     }
 127
 128     @Override
 129     public void accept(ExpressionVisitor visitor) {
 130         visitor.visit(this);
 131     }
 132 }