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/* valascope.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 part of the symbol tree.
*/
public class Vala.Scope {
/**
* The symbol that owns this scope.
*/
public weak Symbol owner { get; set; }
/**
* The parent of this scope.
*/
public weak Scope parent_scope { get; set; }
private Map<string,Symbol> symbol_table;
private List<Symbol> anonymous_members;
/**
* Creates a new scope.
*
* @return newly created scope
*/
public Scope (Symbol? owner = null) {
this.owner = owner;
}
/**
* Adds the specified symbol with the specified name to the symbol table
* of this scope.
*
* @param name name for the specified symbol
* @param sym a symbol
*/
public void add (string? name, Symbol sym) {
// Ignore params-array parameters which can not be conflicted with
if (sym is Parameter && ((Parameter) sym).params_array) {
name = null;
}
if (name != null) {
if (symbol_table == null) {
symbol_table = new HashMap<string,Symbol> (str_hash, str_equal);
} else if (lookup (name) != null) {
owner.error = true;
if (owner.name == null && owner.parent_symbol == null) {
Report.error (sym.source_reference, "The root namespace already contains a definition for `%s'", name);
} else {
Report.error (sym.source_reference, "`%s' already contains a definition for `%s'", owner.get_full_name (), name);
}
Report.notice (lookup (name).source_reference, "previous definition of `%s' was here", name);
return;
}
symbol_table[(string) name] = sym;
} else {
if (anonymous_members == null) {
anonymous_members = new ArrayList<Symbol> ();
}
anonymous_members.add (sym);
}
sym.owner = this;
}
public void remove (string name) {
symbol_table.remove (name);
}
/**
* Returns the symbol stored in the symbol table with the specified
* name.
*
* @param name name of the symbol to be returned
* @return found symbol or null
*/
public Symbol? lookup (string name) {
if (symbol_table == null) {
return null;
}
Symbol sym = symbol_table[name];
if (sym != null && !sym.active) {
sym = null;
}
return sym;
}
/**
* Returns whether the specified scope is an ancestor of this scope.
*
* @param scope a scope or null for the root scope
* @return true if this scope is a subscope of the specified
* scope, false otherwise
*/
public bool is_subscope_of (Scope? scope) {
if (scope == this) {
return true;
}
// null scope is the root scope
if (scope == null) {
return true;
}
if (parent_scope != null) {
return parent_scope.is_subscope_of (scope);
}
return false;
}
public unowned Map<string,Symbol> get_symbol_table () {
return symbol_table;
}
}
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