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/* valascope.vala
*
* Copyright (C) 2006-2007 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 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;
using Gee;
/**
* 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;
/**
* Creates a new scope.
*
* @return newly created scope
*/
public Scope (construct Symbol owner = null) {
}
/**
* 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) {
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;
Report.error (owner.source_reference, "`%s' already contains a definition for `%s'".printf (owner.get_full_name (), name));
return;
}
symbol_table[name] = sym;
}
sym.owner = this;
}
/**
* 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;
}
}
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