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* Copyright (C) 2006 Jürg Billeter
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* Jürg Billeter <j@bitron.ch>
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* Represents a node in the symbol tree.
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public class Vala.Symbol {
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* The code node that created this symbol, if applicable.
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public weak CodeNode node { get; set; }
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* The parent of this symbol.
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public weak Symbol parent_symbol { get; set; }
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public string name { get; set; }
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* Specifies whether this symbol is active.
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* Symbols may become inactive when they only apply to a part of a
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* scope. This is used for local variables not declared at the beginning
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* of the block to determine which variables need to be freed before
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public bool active { get; set; }
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private HashTable<string,Symbol> symbol_table = new HashTable.full (str_hash, str_equal, g_free, g_object_unref);
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* Creates a new symbol.
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* @param node the corresponding code node
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* @return newly created symbol
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public Symbol (CodeNode _node = null) {
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* Returns the fully expanded name of this symbol for use in
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* human-readable messages.
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public ref string get_full_name () {
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if (parent_symbol == null) {
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return parent_symbol.get_full_name ();
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if (parent_symbol.get_full_name () == null) {
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return "%s.%s".printf (parent_symbol.get_full_name (), name);
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* Adds the specified symbol with the specified name to the symbol table
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* @param name name for the specified symbol
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public void add (string! name, Symbol! sym) {
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symbol_table.insert (name, sym);
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sym.parent_symbol = this;
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* Returns the symbol stored in the symbol table with the specified
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* @param name name of the symbol to be returned
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* @return found symbol or null
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public Symbol lookup (string! name) {
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Symbol sym = symbol_table.lookup (name);
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if (sym != null && !sym.active) {