gerrit.simantics Code Review - simantics/platform.git/blob

   1 package org.simantics.scl.compiler.elaboration.expressions;
   2
   3 import java.util.Arrays;
   4
   5 import org.simantics.scl.compiler.constants.SCLConstructor;
   6 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
   7 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext.ExistentialFrame;
   8 import org.simantics.scl.compiler.elaboration.expressions.records.FieldAssignment;
   9 import org.simantics.scl.compiler.elaboration.modules.SCLValue;
  10 import org.simantics.scl.compiler.environment.AmbiguousNameException;
  11 import org.simantics.scl.compiler.errors.Locations;
  12
  13 import gnu.trove.map.hash.THashMap;
  14
  15 public class ERecord extends ASTExpression {
  16
  17     public static final boolean DEBUG = false;
  18
  19     public final EVar constructor;
  20     public final FieldAssignment[] fields;
  21
  22     public ERecord(EVar constructor, FieldAssignment[] fields) {
  23         this.constructor = constructor;
  24         this.fields = fields;
  25     }
  26
  27     @Override
  28     public Expression resolve(TranslationContext context) {
  29         return resolve(context, false);
  30     }
  31
  32     @Override
  33     public Expression resolveAsPattern(TranslationContext context) {
  34         return resolve(context, true);
  35     }
  36
  37     public Expression resolve(TranslationContext context, boolean asPattern) {
  38         SCLValue constructorValue;
  39         try {
  40             constructorValue = context.resolveRecordConstructor(location, constructor.name);
  41         } catch (AmbiguousNameException e) {
  42             context.getErrorLog().log(constructor.location, e.getMessage());
  43             return new EError(constructor.location);
  44         }
  45         if(constructorValue == null) {
  46             context.getErrorLog().log(constructor.location, "Couldn't resolve the record constructor " + constructor.name + ".");
  47             return new EError(constructor.location);
  48         }
  49         String[] parameterNames = constructorValue.parameterNames;
  50         if(parameterNames == null) {
  51             context.getErrorLog().log(constructor.location, "Value " + constructor.name + " is not a record constructor.");
  52             return new EError(constructor.location);
  53         }
  54         Expression[] parameters = translateFieldsToFunctionParameters(context, fields, parameterNames, false);
  55         if(parameters == null)
  56             return new EError(location);
  57         if(asPattern)
  58             for(int i=0;i<parameters.length;++i) {
  59                 Expression parameter = parameters[i];
  60                 if(parameter == null)
  61                     parameters[i] = Expressions.blank(null);
  62                 else
  63                     parameters[i] = parameter.resolveAsPattern(context);
  64             }
  65         else {
  66             boolean error = false;
  67             for(int i=0;i<parameters.length;++i) {
  68                 Expression parameter = parameters[i];
  69                 if(parameter == null) {
  70                     ExistentialFrame frame = context.getCurrentExistentialFrame();
  71                     if(frame == null || frame.disallowNewExistentials) {
  72                         context.getErrorLog().log(location, "Field " + parameterNames[i] + " not defined.");
  73                         error = true;
  74                     }
  75                     else
  76                         parameters[i] = frame.createBlank(location);
  77                 }
  78                 else
  79                     parameters[i] = parameter.resolve(context);
  80             }
  81             if(error)
  82                 return new EError(location);
  83         }
  84         EApply result = new EApply(new EConstant(constructorValue), parameters);
  85         result.setLocationDeep(location);
  86         return result;
  87     }
  88
  89     public static Expression[] translateFieldsToFunctionParameters(TranslationContext context, FieldAssignment[] fields, String[] fieldNames, boolean chrLiteral) {
  90         if(DEBUG) {
  91             System.out.println("translateFieldsToFunctionParameters");
  92             System.out.println("    fieldNames = " + Arrays.toString(fieldNames));
  93             System.out.print("    fields = {");
  94             for(int i=0;i<fields.length;++i) {
  95                 FieldAssignment field = fields[i];
  96                 if(i > 0)
  97                     System.out.print(", ");
  98                 System.out.print(field.name);
  99                 if(field.value != null) {
 100                     System.out.print(" = ");
 101                     System.out.print(field.value);
 102                 }
 103             }
 104             System.out.println("}");
 105         }
 106
 107         THashMap<String,FieldAssignment> recordMap = new THashMap<String,FieldAssignment>(fields.length);
 108         boolean error = false;
 109         FieldAssignment wildcardField = null;
 110         for(FieldAssignment field : fields) {
 111             if(field.value == null) {
 112                 String actualName = field.name;
 113                 if(actualName.equals(FieldAssignment.WILDCARD)) {
 114                     if(wildcardField != null)
 115                         context.getErrorLog().log(field.location, "The record has more than one wildcard.");
 116                     wildcardField = field;
 117                     continue;
 118                 }
 119                 if(actualName.charAt(0) == '?')
 120                     actualName = actualName.substring(1);
 121                 String bestMatch = null;
 122                 int bestMatchLength = 0;
 123                 for(int i=0;i<fieldNames.length;++i) {
 124                     String fieldName = fieldNames[i];
 125                     if(actualName.startsWith(fieldName) && fieldName.length() > bestMatchLength) {
 126                         bestMatch = fieldName;
 127                         bestMatchLength = fieldName.length();
 128                     }
 129                 }
 130                 if(bestMatch == null) {
 131                     context.getErrorLog().log(field.location, "Invalid shorthand field " + field.name + " is defined twice.");
 132                     error = true;
 133                 }
 134                 field.value = new EVar(field.location, field.name);
 135                 field.name = bestMatch;
 136             }
 137             if(recordMap.put(field.name, field) != null) {
 138                 context.getErrorLog().log(field.location, "Field " + field.name + " is defined more than once.");
 139                 error = true;
 140             }
 141         }
 142         if(error)
 143             return null;
 144         Expression[] parameters = new Expression[fieldNames.length];
 145         for(int i=0;i<fieldNames.length;++i) {
 146             FieldAssignment assignment = recordMap.remove(fieldNames[i]);
 147             if(assignment != null)
 148                 parameters[i] = assignment.value;
 149             else if(wildcardField != null) {
 150                 String variableName = fieldNames[i];
 151                 if(chrLiteral)
 152                     variableName = "?" + variableName;
 153                 parameters[i] = new EVar(wildcardField.location, variableName);
 154             }
 155         }
 156         if(!recordMap.isEmpty()) {
 157             for(FieldAssignment field : recordMap.values())
 158                 context.getErrorLog().log(field.location, "Field " + field.name + " is not defined in the constructor.");
 159             return null;
 160         }
 161         if(DEBUG)
 162             System.out.println(" => parameters = " + Arrays.toString(parameters));
 163         return parameters;
 164     }
 165
 166     @Override
 167     public void setLocationDeep(long loc) {
 168         if(location == Locations.NO_LOCATION) {
 169             location = loc;
 170             for(FieldAssignment field : fields)
 171                 if(field.value != null)
 172                     field.value.setLocationDeep(loc);
 173         }
 174     }
 175
 176     @Override
 177     public Expression accept(ExpressionTransformer transformer) {
 178         return transformer.transform(this);
 179     }
 180
 181     @Override
 182     public void accept(ExpressionVisitor visitor) {
 183         visitor.visit(this);
 184     }
 185 }