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/* valaelementaccess.vala
*
* Copyright (C) 2006-2008 Raffaele Sandrini, 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:
* Raffaele Sandrini <raffaele@sandrini.ch>
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
using Gee;
/**
* Represents an array access expression e.g. "a[1,2]".
*/
public class Vala.ElementAccess : Expression {
/**
* Expression representing the container on wich we want to access.
*/
public Expression container { get; set; }
/**
* Expressions representing the indices we want to access inside the container.
*/
private Gee.List<Expression> indices = new ArrayList<Expression> ();
public void append_index (Expression index) {
indices.add (index);
index.parent_node = this;
}
public Gee.List<Expression> get_indices () {
return new ReadOnlyList<Expression> (indices);
}
public ElementAccess (Expression container, SourceReference source_reference) {
this.source_reference = source_reference;
this.container = container;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_element_access (this);
visitor.visit_expression (this);
}
public override void accept_children (CodeVisitor visitor) {
container.accept (visitor);
foreach (Expression e in indices) {
e.accept (visitor);
}
}
public override void replace_expression (Expression old_node, Expression new_node) {
if (container == old_node) {
container = new_node;
}
int index = indices.index_of (old_node);
if (index >= 0 && new_node.parent_node == null) {
indices[index] = new_node;
new_node.parent_node = this;
}
}
public override bool is_pure () {
foreach (Expression index in indices) {
if (!index.is_pure ()) {
return false;
}
}
return container.is_pure ();
}
public override bool check (SemanticAnalyzer analyzer) {
if (checked) {
return !error;
}
checked = true;
container.check (analyzer);
if (container.value_type == null) {
/* don't proceed if a child expression failed */
error = true;
return false;
}
var container_type = container.value_type.data_type;
if (container is MemberAccess && container.symbol_reference is Signal) {
// signal detail access
if (get_indices ().size != 1) {
error = true;
Report.error (source_reference, "Element access with more than one dimension is not supported for signals");
return false;
}
get_indices ().get (0).target_type = analyzer.string_type.copy ();
}
foreach (Expression index in get_indices ()) {
index.check (analyzer);
}
bool index_int_type_check = true;
var pointer_type = container.value_type as PointerType;
/* assign a value_type when possible */
if (container.value_type is ArrayType) {
var array_type = (ArrayType) container.value_type;
value_type = array_type.element_type.copy ();
if (!lvalue) {
value_type.value_owned = false;
}
} else if (pointer_type != null && !pointer_type.base_type.is_reference_type_or_type_parameter ()) {
value_type = pointer_type.base_type.copy ();
} else if (container_type == analyzer.string_type.data_type) {
if (get_indices ().size != 1) {
error = true;
Report.error (source_reference, "Element access with more than one dimension is not supported for strings");
return false;
}
value_type = analyzer.unichar_type;
} else if (container_type != null && analyzer.list_type != null && analyzer.map_type != null &&
(container_type.is_subtype_of (analyzer.list_type) || container_type.is_subtype_of (analyzer.map_type))) {
Gee.List<Expression> indices = get_indices ();
if (indices.size != 1) {
error = true;
Report.error (source_reference, "Element access with more than one dimension is not supported for the specified type");
return false;
}
Iterator<Expression> indices_it = indices.iterator ();
indices_it.next ();
var index = indices_it.get ();
index_int_type_check = false;
// lookup symbol in interface instead of class as implemented interface methods are not in VAPI files
Symbol get_sym = null;
if (container_type.is_subtype_of (analyzer.list_type)) {
get_sym = analyzer.list_type.scope.lookup ("get");
} else if (container_type.is_subtype_of (analyzer.map_type)) {
get_sym = analyzer.map_type.scope.lookup ("get");
}
var get_method = (Method) get_sym;
Gee.List<FormalParameter> get_params = get_method.get_parameters ();
Iterator<FormalParameter> get_params_it = get_params.iterator ();
get_params_it.next ();
var get_param = get_params_it.get ();
var index_type = get_param.parameter_type;
if (index_type.type_parameter != null) {
index_type = analyzer.get_actual_type (container.value_type, get_method, get_param.parameter_type, this);
}
if (!index.value_type.compatible (index_type)) {
error = true;
Report.error (source_reference, "index expression: Cannot convert from `%s' to `%s'".printf (index.value_type.to_string (), index_type.to_string ()));
return false;
}
value_type = analyzer.get_actual_type (container.value_type, get_method, get_method.return_type, this).copy ();
if (lvalue) {
// get () returns owned value, set () accepts unowned value
value_type.value_owned = false;
}
} else if (container is MemberAccess && container.symbol_reference is Signal) {
index_int_type_check = false;
symbol_reference = container.symbol_reference;
value_type = container.value_type;
} else {
error = true;
Report.error (source_reference, "The expression `%s' does not denote an Array".printf (container.value_type.to_string ()));
}
if (index_int_type_check) {
/* check if the index is of type integer */
foreach (Expression e in get_indices ()) {
/* don't proceed if a child expression failed */
if (e.value_type == null) {
return false;
}
/* check if the index is of type integer */
if (!(e.value_type.data_type is Struct) || !((Struct) e.value_type.data_type).is_integer_type ()) {
error = true;
Report.error (e.source_reference, "Expression of integer type expected");
}
}
}
return !error;
}
public override void get_defined_variables (Collection<LocalVariable> collection) {
container.get_defined_variables (collection);
foreach (Expression index in indices) {
index.get_defined_variables (collection);
}
}
public override void get_used_variables (Collection<LocalVariable> collection) {
container.get_used_variables (collection);
foreach (Expression index in indices) {
index.get_used_variables (collection);
}
}
}
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