+++ /dev/null
-package org.simantics.scl.compiler.internal.deriving;
-
-import java.util.ArrayList;
-
-import org.simantics.scl.compiler.common.datatypes.Constructor;
-import org.simantics.scl.compiler.constants.IntegerConstant;
-import org.simantics.scl.compiler.elaboration.errors.NotPatternException;
-import org.simantics.scl.compiler.elaboration.expressions.EApply;
-import org.simantics.scl.compiler.elaboration.expressions.ELiteral;
-import org.simantics.scl.compiler.elaboration.expressions.EVar;
-import org.simantics.scl.compiler.elaboration.expressions.Expression;
-import org.simantics.scl.compiler.elaboration.modules.TypeConstructor;
-import org.simantics.scl.compiler.environment.AmbiguousNameException;
-import org.simantics.scl.compiler.environment.Environment;
-import org.simantics.scl.compiler.environment.Environments;
-import org.simantics.scl.compiler.errors.ErrorLog;
-import org.simantics.scl.compiler.internal.parsing.declarations.DDerivingInstanceAst;
-import org.simantics.scl.compiler.internal.parsing.declarations.DInstanceAst;
-import org.simantics.scl.compiler.internal.parsing.declarations.DValueAst;
-import org.simantics.scl.compiler.internal.parsing.expressions.Expressions;
-import org.simantics.scl.compiler.internal.parsing.translation.ProcessedDInstanceAst;
-import org.simantics.scl.compiler.internal.parsing.translation.ValueRepository;
-import org.simantics.scl.compiler.internal.parsing.types.TVarAst;
-import org.simantics.scl.compiler.types.TCon;
-
-class HashableDeriver implements InstanceDeriver {
-
- @Override
- public void derive(
- ErrorLog errorLog,
- Environment environment,
- ArrayList<ProcessedDInstanceAst> instancesAst,
- DDerivingInstanceAst der) {
- // Analyze
- if(der.types.length != 1) {
- errorLog.log(der.location, "Invalid number of parameters to " + der.name);
- return;
- }
- TVarAst headType = DerivingUtils.getHeadType(der.types[0]);
- if(headType == null) {
- errorLog.log(der.types[0].location, "Cannot derive Hashable instance for the type " + headType + ".");
- return;
- }
- TCon con;
- try {
- con = Environments.getTypeConstructorName(environment, headType.name);
- } catch (AmbiguousNameException e1) {
- errorLog.log(headType.location, e1.getMessage());
- return;
- }
- if(con == null) {
- errorLog.log(headType.location, "Couldn't resolve " + headType.name);
- return;
- }
- TypeConstructor tcon = environment.getTypeConstructor(con);
- if(tcon == null) {
- errorLog.log(headType.location, "Didn't find type constructor for " + headType.name);
- return;
- }
- if(tcon.isOpen) {
- errorLog.log(headType.location, "Cannot derive instance for open data types.");
- return;
- }
-
- // Generate
- DInstanceAst instanceAst = new DInstanceAst(der.location, der.context, der.name, der.types);
- ValueRepository valueDefs = new ValueRepository();
- int cId = 0;
- for(Constructor constructor : tcon.constructors) {
- int l = constructor.parameterTypes.length;
- String[] par = new String[l];
- for(int i=0;i<l;++i) {
- par[i] = "v" + i;
- }
- Expression lhs = new EApply(
- new EVar("hashP"),
- new EApply(new EVar(constructor.name.name), Expressions.vars(par)),
- new EVar("accum")
- );
- Expression value = new EVar("accum");
- for(int i=0;i<l;++i) {
- value = new EApply(new EVar("hashP"),
- new EVar(par[i]),
- value
- );
- }
- if(tcon.constructors.length > 1)
- value = new EApply(new EVar("hashP"),
- new ELiteral(new IntegerConstant(cId)),
- value
- );
-
- try {
- DValueAst valueAst = new DValueAst(lhs, value);
- valueAst.setLocationDeep(der.location);
- valueDefs.add(valueAst);
- } catch (NotPatternException e) {
- errorLog.log(e.getExpression().location, "Not a pattern.");
- }
- ++ cId;
- }
- instancesAst.add(new ProcessedDInstanceAst(instanceAst, valueDefs));
- }
-
-}