1 files changed, 167 insertions, 0 deletions
diff --git a/java/demo/Database/library/Grammar.java b/java/demo/Database/library/Grammar.java
new file mode 100644
index 00000000000..2b180cf139e
--- /dev/null
+++ b/java/demo/Database/library/Grammar.java
@@ -0,0 +1,167 @@
+// **********************************************************************
+//
+// Copyright (c) 2003-2008 ZeroC, Inc. All rights reserved.
+//
+// This copy of Ice is licensed to you under the terms described in the
+// ICE_LICENSE file included in this distribution.
+//
+// **********************************************************************
+
+class Grammar
+{
+    Grammar(Parser p)
+    {
+        _parser = p;
+        _scanner = new Scanner(_parser);
+    }
+
+    void
+    parse()
+    {
+        while(true)
+        {
+            try
+            {
+                _token = _scanner.nextToken();
+                if(_token == null)
+                {
+                    return;
+                }
+                else if(_token.type == Token.TOK_SEMI)
+                {
+                    // Continue
+                }
+                else if(_token.type == Token.TOK_HELP)
+                {
+                    _token = _scanner.nextToken();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+
+                    _parser.usage();
+                }
+                else if(_token.type == Token.TOK_EXIT)
+                {
+                    _token = _scanner.nextToken();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+
+                    return;
+                }
+                else if(_token.type == Token.TOK_ADD_BOOK)
+                {
+                    java.util.List s = strings();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+                    _parser.addBook(s);
+                }
+                else if(_token.type == Token.TOK_FIND_ISBN)
+                {
+                    java.util.List s = strings();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+                    _parser.findIsbn(s);
+                }
+                else if(_token.type == Token.TOK_FIND_AUTHORS)
+                {
+                    java.util.List s = strings();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+                    _parser.findAuthors(s);
+                }
+                else if(_token.type == Token.TOK_NEXT_FOUND_BOOK)
+                {
+                    _token = _scanner.nextToken();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+
+                    _parser.nextFoundBook();
+                }
+                else if(_token.type == Token.TOK_PRINT_CURRENT)
+                {
+                    _token = _scanner.nextToken();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+
+                    _parser.printCurrent();
+                }
+                else if(_token.type == Token.TOK_RENT_BOOK)
+                {
+                    java.util.List s = strings();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+                    _parser.rentCurrent(s);
+                }
+                else if(_token.type == Token.TOK_RETURN_BOOK)
+                {
+                    _token = _scanner.nextToken();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+                    _parser.returnCurrent();
+                }
+                else if(_token.type == Token.TOK_REMOVE_CURRENT)
+                {
+                    _token = _scanner.nextToken();
+                    if(_token.type != Token.TOK_SEMI)
+                    {
+                        throw new ParseError("Expected ';'");
+                    }
+
+                    _parser.removeCurrent();
+                }
+                else
+                {
+                    _parser.error("parse error");
+                }
+            }
+            catch(ParseError e)
+            {
+                _parser.error("Parse error: " + e.getMessage());
+            }
+        }
+    }
+
+    private java.util.List
+    strings()
+    {
+        java.util.List l = new java.util.ArrayList();
+        while(true)
+        {
+            _token = _scanner.nextToken();
+            if(_token.type != Token.TOK_STRING)
+            {
+                return l;
+            }
+            l.add(_token.value);
+        }
+    }
+
+    static private class ParseError extends RuntimeException
+    {
+        ParseError(String msg)
+        {
+            super(msg);
+        }
+    }
+
+    private Parser _parser;
+    private Scanner _scanner;
+    private Token _token;
+}