| /******************************************************************************* |
| * Copyright (c) 2011 NumberFour AG |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0. |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * NumberFour AG - initial API and Implementation (Alex Panchenko) |
| *******************************************************************************/ |
| package org.eclipse.dltk.javascript.parser; |
| |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.eclipse.dltk.javascript.ast.JSDeclaration; |
| import org.eclipse.dltk.javascript.ast.JSScope; |
| import org.eclipse.dltk.javascript.ast.LabelledStatement; |
| |
| public class SymbolTable { |
| private final Map<String, SymbolKind> symbols = new HashMap<String, SymbolKind>(); |
| |
| private final Set<String> labels = new HashSet<String>(); |
| |
| private final JSScope scope; |
| |
| public SymbolTable(JSScope scope) { |
| this.scope = scope; |
| } |
| |
| public SymbolKind canAdd(String name) { |
| return symbols.get(name); |
| } |
| |
| public SymbolKind add(String name, SymbolKind kind) { |
| return add(name, kind, null); |
| } |
| |
| public SymbolKind add(String name, SymbolKind kind, JSDeclaration node) { |
| if (node != null) { |
| scope.addDeclaration(node); |
| } |
| SymbolKind prev = symbols.get(name); |
| if (prev != null) { |
| return prev; |
| } |
| symbols.put(name, kind); |
| return null; |
| } |
| |
| public boolean addLabel(LabelledStatement statement) { |
| final String label = statement.getLabel().getText(); |
| if (labels.contains(label)) { |
| return false; |
| } |
| labels.add(label); |
| return true; |
| } |
| |
| public boolean hasLabel(String label) { |
| return labels.contains(label); |
| } |
| } |