public EvaluationTree parse()
{
ExpressionLexer lexer = new ExpressionLexer(expression);
TokenStream tokenStream = lexer.lex();
SyntaxTree syntaxTree = new SyntaxTree(tokenStream);
syntaxTree.analyze();
SemanticTree semanticTree = new SemanticTree(syntaxTree);
semanticTree.analyze(declaration);
EvaluationTree evaluationTree = new EvaluationTree(semanticTree);
return(evaluationTree);
}
