Examples of ptolemy.data.expr.ParseTreeEvaluator

ptolemy.data.expr.ParseTreeEvaluator
This class evaluates a parse tree given a reference to its root node. It implements a visitor that visits the parse tree in depth-first order, evaluating each node and storing the result as a token in the node. Two exceptions are logic nodes and the ternary if node (the ? : construct), which do not necessarily evaluate all children nodes. @author Steve Neuendorffer @version $Id: ParseTreeEvaluator.java,v 1.101 2007/12/06 18:19:50 cxh Exp $ @since Ptolemy II 2.1 @Pt.ProposedRating Green (neuendor) @Pt.AcceptedRating Yellow (neuendor) @see ptolemy.data.expr.ASTPtRootNode

     *   not contain a parsable boolean matrix.
     */
    public BooleanMatrixToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);


        if (token instanceof BooleanMatrixToken) {
            boolean[][] value = ((BooleanMatrixToken) token).booleanMatrix();
            _initialize(value);
        } else {

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            }


            ASTPtRootNode parseTree = _parser.generateParseTree(string);


            if (_parseTreeEvaluator == null) {
                _parseTreeEvaluator = new ParseTreeEvaluator();
            }


            if (_scope == null) {
                _scope = new ExpressionScope();
            }

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    public Token evaluateExpression(String expression)
            throws PtalonRuntimeException {
        try {
            PtParser parser = new PtParser();


            ParseTreeEvaluator _parseTreeEvaluator = new ParseTreeEvaluator();
            ASTPtRootNode _parseTree = parser.generateParseTree(expression);
            Token result = _parseTreeEvaluator.evaluateParseTree(_parseTree,
                    _scope);
            return result;
        } catch (Exception ex) {
            throw new PtalonRuntimeException("Unable to evaluate expression\n"
                    + expression, ex);

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     *  possible.
     */
    public String evaluateString(String expression) {
        try {
            PtParser parser = new PtParser();
            ParseTreeEvaluator _parseTreeEvaluator = new ParseTreeEvaluator();
            ASTPtRootNode _parseTree = parser.generateParseTree(expression);
            Token result = _parseTreeEvaluator.evaluateParseTree(_parseTree,
                    _scope);
            if (result instanceof StringToken) {
                return ((StringToken) result).stringValue();
            }
            return result.toString();

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