// scopeDeclaredValue scopes a declared value (variable statement, variable member, type field).
func (sb *scopeBuilder) scopeDeclaredValue(node compilergraph.GraphNode, title string, option requiresInitializerOption, exprPredicate compilergraph.Predicate, context scopeContext) proto.ScopeInfo {
var exprScope *proto.ScopeInfo = nil
exprNode, hasExpression := node.TryGetNode(exprPredicate)
if hasExpression {
// Scope the expression.
exprScope = sb.getScope(exprNode, context)
if !exprScope.GetIsValid() {
return newScope().Invalid().GetScope()
}
}
// Load the declared type, if any.
declaredType, hasDeclaredType := sb.getDeclaredVariableType(node)
if !hasDeclaredType {
if exprScope == nil {
panic("Somehow ended up with no declared type and no expr scope")
}
return newScope().Valid().AssignableResolvedTypeOf(exprScope).GetScope()
}
// Compare against the type of the expression.
if hasExpression {
exprType := exprScope.ResolvedTypeRef(sb.sg.tdg)
if serr := exprType.CheckSubTypeOf(declaredType); serr != nil {
sb.decorateWithError(node, "%s '%s' has declared type '%v': %v", title, node.Get(parser.NodeVariableStatementName), declaredType, serr)
return newScope().Invalid().GetScope()
}
} else if option == requiresInitializer {
// Make sure if the type is non-nullable that there is an expression.
if !declaredType.IsNullable() {
sb.decorateWithError(node, "%s '%s' must have explicit initializer as its type '%v' is non-nullable", title, node.Get(parser.NodeVariableStatementName), declaredType)
return newScope().Invalid().Assignable(declaredType).GetScope()
}
}
return newScope().Valid().Assignable(declaredType).GetScope()
}
