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/* valainterface.vala
*
* Copyright (C) 2006-2010 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Represents a class declaration in the source code.
*/
public class Vala.Interface : ObjectTypeSymbol {
private List<DataType> prerequisites = new ArrayList<DataType> ();
private List<Symbol> virtuals = new ArrayList<Symbol> ();
/**
* Creates a new interface.
*
* @param name type name
* @param source_reference reference to source code
* @return newly created interface
*/
public Interface (string name, SourceReference? source_reference = null, Comment? comment = null) {
base (name, source_reference, comment);
}
/**
* Adds the specified interface or class to the list of prerequisites of
* this interface.
*
* @param type an interface or class reference
*/
public void add_prerequisite (DataType type) {
prerequisites.add (type);
type.parent_node = this;
}
/**
* Returns a copy of the base type list.
*
* @return list of base types
*/
public List<DataType> get_prerequisites () {
return prerequisites;
}
/**
* Adds the specified method as a member to this interface.
*
* @param m a method
*/
public override void add_method (Method m) {
if (m is CreationMethod) {
Report.error (m.source_reference, "construction methods may only be declared within classes and structs");
m.error = true;
return;
}
if (m.binding == MemberBinding.INSTANCE) {
m.this_parameter = new Parameter ("this", get_this_type ());
m.scope.add (m.this_parameter.name, m.this_parameter);
}
if (!(m.return_type is VoidType) && m.get_postconditions ().size > 0) {
m.result_var = new LocalVariable (m.return_type.copy (), "result", null, source_reference);
m.result_var.is_result = true;
}
base.add_method (m);
}
/**
* Adds the specified property as a member to this interface.
*
* @param prop a property
*/
public override void add_property (Property prop) {
if (prop.field != null) {
Report.error (prop.source_reference, "interface properties should be `abstract' or have `get' accessor and/or `set' mutator");
prop.error = true;
return;
}
base.add_property (prop);
prop.this_parameter = new Parameter ("this", new ObjectType (this));
prop.scope.add (prop.this_parameter.name, prop.this_parameter);
}
public virtual List<Symbol> get_virtuals () {
return virtuals;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_interface (this);
}
public override void accept_children (CodeVisitor visitor) {
foreach (DataType type in prerequisites) {
type.accept (visitor);
}
foreach (TypeParameter p in get_type_parameters ()) {
p.accept (visitor);
}
/* process enums first to avoid order problems in C code */
foreach (Enum en in get_enums ()) {
en.accept (visitor);
}
foreach (Method m in get_methods ()) {
m.accept (visitor);
}
foreach (Field f in get_fields ()) {
f.accept (visitor);
}
foreach (Constant c in get_constants ()) {
c.accept (visitor);
}
foreach (Property prop in get_properties ()) {
prop.accept (visitor);
}
foreach (Signal sig in get_signals ()) {
sig.accept (visitor);
}
foreach (Class cl in get_classes ()) {
cl.accept (visitor);
}
foreach (Struct st in get_structs ()) {
st.accept (visitor);
}
foreach (Delegate d in get_delegates ()) {
d.accept (visitor);
}
}
public override bool is_reference_type () {
return true;
}
public override bool is_subtype_of (TypeSymbol t) {
if (this == t) {
return true;
}
foreach (DataType prerequisite in prerequisites) {
if (prerequisite.data_type != null && prerequisite.data_type.is_subtype_of (t)) {
return true;
}
}
return false;
}
public override void replace_type (DataType old_type, DataType new_type) {
for (int i = 0; i < prerequisites.size; i++) {
if (prerequisites[i] == old_type) {
prerequisites[i] = new_type;
new_type.parent_node = this;
return;
}
}
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
var old_source_file = context.analyzer.current_source_file;
var old_symbol = context.analyzer.current_symbol;
if (source_reference != null) {
context.analyzer.current_source_file = source_reference.file;
}
context.analyzer.current_symbol = this;
foreach (DataType prerequisite_reference in get_prerequisites ()) {
// check whether prerequisite is at least as accessible as the interface
if (!context.analyzer.is_type_accessible (this, prerequisite_reference)) {
error = true;
Report.error (source_reference, "prerequisite `%s' is less accessible than interface `%s'".printf (prerequisite_reference.to_string (), get_full_name ()));
return false;
}
}
/* check prerequisites */
Class prereq_class = null;
foreach (DataType prereq in get_prerequisites ()) {
TypeSymbol class_or_interface = prereq.data_type;
/* skip on previous errors */
if (class_or_interface == null) {
error = true;
continue;
}
if (!(class_or_interface is ObjectTypeSymbol)) {
error = true;
Report.error (source_reference, "Prerequisite `%s' of interface `%s' is not a class or interface".printf (get_full_name (), class_or_interface.to_string ()));
return false;
}
/* interfaces are not allowed to have multiple instantiable prerequisites */
if (class_or_interface is Class) {
if (prereq_class != null) {
error = true;
Report.error (source_reference, "%s: Interfaces cannot have multiple instantiable prerequisites (`%s' and `%s')".printf (get_full_name (), class_or_interface.get_full_name (), prereq_class.get_full_name ()));
return false;
}
prereq_class = (Class) class_or_interface;
}
}
foreach (DataType type in prerequisites) {
type.check (context);
}
foreach (TypeParameter p in get_type_parameters ()) {
p.check (context);
}
foreach (Enum en in get_enums ()) {
en.check (context);
}
foreach (Field f in get_fields ()) {
f.check (context);
}
foreach (Constant c in get_constants ()) {
c.check (context);
}
if (context.abi_stability) {
foreach (Symbol s in get_members ()) {
if (s is Method) {
var m = (Method) s;
m.check (context);
if (m.is_virtual || m.is_abstract) {
virtuals.add (m);
}
} else if (s is Signal) {
var sig = (Signal) s;
sig.check (context);
if (sig.is_virtual) {
virtuals.add (sig);
}
} else if (s is Property) {
var prop = (Property) s;
prop.check (context);
if (prop.is_virtual || prop.is_abstract) {
virtuals.add (prop);
}
}
}
} else {
foreach (Method m in get_methods ()) {
m.check (context);
if (m.is_virtual || m.is_abstract) {
virtuals.add (m);
}
}
foreach (Signal sig in get_signals ()) {
sig.check (context);
if (sig.is_virtual) {
virtuals.add (sig);
}
}
foreach (Property prop in get_properties ()) {
prop.check (context);
if (prop.is_virtual || prop.is_abstract) {
virtuals.add (prop);
}
}
}
foreach (Class cl in get_classes ()) {
cl.check (context);
}
foreach (Struct st in get_structs ()) {
st.check (context);
}
foreach (Delegate d in get_delegates ()) {
d.check (context);
}
Map<int, Symbol>? positions = new HashMap<int, Symbol> ();
bool ordered_seen = false;
bool unordered_seen = false;
foreach (Symbol sym in virtuals) {
int ordering = sym.get_attribute_integer ("CCode", "ordering", -1);
if (ordering < -1) {
Report.error (sym.source_reference, "%s: Invalid ordering".printf (sym.get_full_name ()));
// Mark state as invalid
error = true;
ordered_seen = true;
unordered_seen = true;
continue;
}
bool ordered = ordering != -1;
if (ordered && unordered_seen && !ordered_seen) {
Report.error (sym.source_reference, "%s: Cannot mix ordered and unordered virtuals".printf (sym.get_full_name ()));
error = true;
}
ordered_seen = ordered_seen || ordered;
if (!ordered && !unordered_seen && ordered_seen) {
Report.error (sym.source_reference, "%s: Cannot mix ordered and unordered virtuals".printf (sym.get_full_name ()));
error = true;
}
unordered_seen = unordered_seen || !ordered;
if (!ordered_seen || !unordered_seen) {
if (ordered) {
Symbol? prev = positions[ordering];
if (prev != null) {
Report.error (sym.source_reference, "%s: Duplicate ordering (previous virtual with the same position is %s)".printf (sym.get_full_name (), prev.name));
error = true;
}
positions[ordering] = sym;
}
}
}
if (ordered_seen) {
for (int i = 0; i < virtuals.size; i++) {
Symbol? sym = positions[i];
if (sym == null) {
Report.error (source_reference, "%s: Gap in ordering in position %d".printf (get_full_name (), i));
error = true;
}
if (!error) {
virtuals[i] = sym;
}
}
}
context.analyzer.current_source_file = old_source_file;
context.analyzer.current_symbol = old_symbol;
return !error;
}
}
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