1 package org.simantics.scl.compiler.internal.deriving;
3 import java.util.ArrayList;
5 import org.simantics.scl.compiler.common.datatypes.Constructor;
6 import org.simantics.scl.compiler.elaboration.errors.NotPatternException;
7 import org.simantics.scl.compiler.elaboration.expressions.EApply;
8 import org.simantics.scl.compiler.elaboration.expressions.EVar;
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.elaboration.modules.TypeConstructor;
13 import org.simantics.scl.compiler.environment.AmbiguousNameException;
14 import org.simantics.scl.compiler.environment.Environment;
15 import org.simantics.scl.compiler.environment.Environments;
16 import org.simantics.scl.compiler.errors.ErrorLog;
17 import org.simantics.scl.compiler.internal.parsing.declarations.DDerivingInstanceAst;
18 import org.simantics.scl.compiler.internal.parsing.declarations.DInstanceAst;
19 import org.simantics.scl.compiler.internal.parsing.declarations.DValueAst;
20 import org.simantics.scl.compiler.internal.parsing.expressions.Expressions;
21 import org.simantics.scl.compiler.internal.parsing.translation.ProcessedDInstanceAst;
22 import org.simantics.scl.compiler.internal.parsing.translation.ValueRepository;
23 import org.simantics.scl.compiler.internal.parsing.types.TVarAst;
24 import org.simantics.scl.compiler.types.TCon;
26 class EqDeriver implements InstanceDeriver {
31 Environment environment,
32 ArrayList<ProcessedDInstanceAst> instancesAst,
33 DDerivingInstanceAst der) {
35 if(der.types.length != 1) {
36 errorLog.log(der.location, "Invalid number of parameters to " + der.name);
39 TVarAst headType = DerivingUtils.getHeadType(der.types[0]);
40 if(headType == null) {
41 errorLog.log(der.types[0].location, "Cannot derive Eq instance for the type " + headType + ".");
46 con = Environments.getTypeConstructorName(environment, headType.name);
47 } catch (AmbiguousNameException e1) {
48 errorLog.log(headType.location, e1.getMessage());
52 errorLog.log(headType.location, "Couldn't resolve " + headType.name);
55 TypeConstructor tcon = environment.getTypeConstructor(con);
57 errorLog.log(headType.location, "Didn't find type constructor for " + headType.name);
61 errorLog.log(headType.location, "Cannot derive instance for open data types.");
66 DInstanceAst instanceAst = new DInstanceAst(der.location, der.context, der.name, der.types);
67 ValueRepository valueDefs = new ValueRepository();
68 for(Constructor constructor : tcon.constructors) {
69 int l = constructor.parameterTypes.length;
70 String[] par1 = new String[l];
71 String[] par2 = new String[l];
72 for(int i=0;i<l;++i) {
76 Expression lhs = new EApply(
78 new EApply(new EVar(constructor.name.name), Expressions.vars(par1)),
79 new EApply(new EVar(constructor.name.name), Expressions.vars(par2))
81 Expression value = new EVar("True");
82 for(int i=l-1;i>=0;--i)
91 DValueAst valueAst = new DValueAst(lhs, value);
92 valueAst.setLocationDeep(der.location);
93 valueDefs.add(valueAst);
94 } catch (NotPatternException e) {
95 errorLog.log(e.getExpression().location, "Not a pattern.");
99 Expression lhs = new EApply(
101 new EVariable(new Variable("_")),
102 new EVariable(new Variable("_")));
103 Expression value = new EVar("False");
105 DValueAst valueAst = new DValueAst(lhs, value);
106 valueAst.setLocationDeep(der.location);
107 valueDefs.add(valueAst);
108 /*valueDefs.addAnnotation("==", new DAnnotationAst(new EVar("@private"),
109 Collections.<Expression>emptyList()));*/
110 } catch (NotPatternException e) {
111 errorLog.log(e.getExpression().location, "Not a pattern.");
114 instancesAst.add(new ProcessedDInstanceAst(instanceAst, valueDefs));