1 package org.simantics.scl.compiler.elaboration.expressions;
3 import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;
4 import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
5 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
6 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
7 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
8 import org.simantics.scl.compiler.elaboration.query.QExists;
9 import org.simantics.scl.compiler.elaboration.query.Query;
10 import org.simantics.scl.compiler.elaboration.query.compilation.QueryCompilationContext;
11 import org.simantics.scl.compiler.elaboration.query.compilation.QueryCompilationMode;
12 import org.simantics.scl.compiler.elaboration.query.compilation.UnsolvableQueryException;
13 import org.simantics.scl.compiler.errors.Locations;
14 import org.simantics.scl.compiler.types.Type;
15 import org.simantics.scl.compiler.types.Types;
16 import org.simantics.scl.compiler.types.exceptions.MatchException;
17 import org.simantics.scl.compiler.types.exceptions.UnificationException;
18 import org.simantics.scl.compiler.types.kinds.Kinds;
20 import gnu.trove.map.hash.TObjectIntHashMap;
21 import gnu.trove.set.hash.THashSet;
22 import gnu.trove.set.hash.TIntHashSet;
24 public class EWhen extends SimplifiableExpression {
27 public Expression action;
30 public EWhen(Query query, Expression action) {
35 public EWhen(long location, Query query, Expression action, Variable[] variables) {
37 throw new NullPointerException();
38 if(location == Locations.NO_LOCATION)
39 new Exception().printStackTrace();
40 this.location = location;
43 this.variables = variables;
47 public void collectVars(TObjectIntHashMap<Variable> allVars,
49 query.collectVars(allVars, vars);
50 action.collectVars(allVars, vars);
54 public void collectEffects(THashSet<Type> effects) {
55 throw new InternalCompilerError(location, getClass().getSimpleName() + " does not support collectEffects.");
59 protected void updateType() throws MatchException {
64 public Expression checkBasicType(TypingContext context, Type requiredType) {
66 Types.unify(requiredType, Types.UNIT);
67 } catch (UnificationException e) {
68 context.typeError(location, requiredType, Types.UNIT);
71 for(Variable variable : variables)
72 variable.setType(Types.metaVar(Kinds.STAR));
73 query.checkType(context);
74 action.checkIgnoredType(context);
77 return compile(context);
80 public Expression compile(TypingContext context) {
82 QueryCompilationContext queryCompilationContext =
83 new QueryCompilationContext(context, QueryCompilationMode.ITERATE, null, action);
84 new QExists(variables, query).generate(queryCompilationContext);
85 return queryCompilationContext.getContinuation();
86 } catch(UnsolvableQueryException e) {
87 context.getErrorLog().log(getLocation(), "Failed to compile the query.\n" + e.getMessage());
88 return new EError(getLocation());
93 public void collectFreeVariables(THashSet<Variable> vars) {
94 action.collectFreeVariables(vars);
95 query.collectFreeVariables(vars);
96 for(Variable var : variables)
101 public Expression resolve(TranslationContext context) {
102 context.pushExistentialFrame();
103 query = query.resolve(context);
104 action = action.resolve(context);
105 variables = context.popExistentialFrame();
110 public Expression replace(ReplaceContext context) {
111 Variable[] newVariables = new Variable[variables.length];
112 for(int i=0;i<variables.length;++i) {
113 Variable variable = variables[i];
114 Variable newVariable = new Variable(variable.name, variable.getType());
115 newVariables[i] = newVariable;
116 context.varMap.put(variable, new EVariable(newVariable));
118 EWhen result = new EWhen(location, query.replace(context), action.replace(context), newVariables);
119 for(int i=0;i<variables.length;++i)
120 context.varMap.remove(variables[i]);
125 public void setLocationDeep(long loc) {
126 if(location == Locations.NO_LOCATION) {
128 query.setLocationDeep(loc);
129 action.setLocationDeep(loc);
134 public void accept(ExpressionVisitor visitor) {
138 public Query getQuery() {
142 public Expression getAction() {
147 public Expression simplify(SimplificationContext context) {
148 throw new UnsupportedOperationException();
152 public Expression accept(ExpressionTransformer transformer) {
153 return transformer.transform(this);