// handles assignment to subscription expression
@Override
public RType afterSubscriptionType(
List<RExpression> indices, RType valueType, boolean isSingleBracket) {
if (indices.isEmpty()) {
return this;
}
if (indices.size() > 1) {
return RUnknownType.INSTANCE;
}
if (isSingleBracket && valueType instanceof RListType) {
RListType list = (RListType) valueType;
if (!list.myPrecise) {
return RUnknownType.INSTANCE;
}
if (list.myPositionalTypes.isEmpty()) {
return RUnknownType.INSTANCE;
}
valueType = list.myPositionalTypes.get(0).myType;
}
RExpression index = indices.get(0);
RListType resultType = new RListType(this);
if (index instanceof RStringLiteralExpression) {
String quoted = index.getText();
String indexName = quoted.substring(1, quoted.length() - 1);
if (valueType instanceof RNullType) {
resultType.removeField(indexName);
} else {
resultType.addField(indexName, valueType);
}
}
if (index instanceof RNumericLiteralExpression) {
try {
int i = Integer.parseInt(index.getText());
if (valueType instanceof RNullType) {
resultType.removeField(i - 1);
} else {
resultType.addField(i - 1, valueType);
}
} catch (NumberFormatException e) {
// do nothing
}
}
return resultType;
}
@Override
public RType afterMemberType(String tag, RType valueType) {
RListType clone = clone();
if (valueType instanceof RNullType) {
clone.removeField(tag);
} else {
clone.addField(tag, valueType);
}
return clone;
}