Examples of PtParser

ptolemy.data.expr.PtParser
This file implements an expression parser for Ptolemy II using the JavaCC parser generator. It can handle all the basic arithmetic operators (*, /, +, -, %, ^), relational operators (<, <=,>, >=, == !=), logical operators(&&, ||, !), bitwise operators (&, |, #, ~) and, using reflection, all of the functionality available in the java.lang.Math package.
By editing the ASTFunctionNode file it is also relatively easy to allow references to other functions. This provides an easy mechanism to extend the range to the parser e.g. have a tcl(...) function that passes the string to a Tcl interpreter and retuns the result.
Functional if is supported via the following syntax: (boolean) ? (value1) : (value2)
Extensibility is also supported by allowing method calls on the Tokens, the syntax is (value1).method(comma separated arguments)
JavaCC by itself simply generates a file (and support files) that allow an input to be parsed, it does not return a parse tree. For the purposes of type checking we require a parse tree, and this is obtained using JJTree, a preprocessor for JavaCC.
JJtree operates by annotating the grammar file to support the generation of the parse tree. Thus the process is

X.jjt --> JJTREE --> X.jj --> JAVACC --> X.java + support files

The parser can also be passed a symbol table of ptolemy.data.expr.Variables which the expression to be parsed can reference.
Anything between quotes(") or apostrophes(') is taken to be one string. Strings are allowed to contain newlines or carriage returns. In addition, these characters, as well as other special characters, can be escaped using the standard Java syntax (\n, \t, \077, etc.).
The expressions recognized follow as close as possible the syntax of Java. In particular the operator precedences implemented here follow exactly those in Java. Any type conversions that are performed are lossless. If the user wants lossy conversions, explicit casts will be necessary.
Complex number are specified by an i or j after the imaginary part of the number. Long numbers are specified by an l or L after an integer number.
Users can register constants with the parser and also register classes where functions that may be called are defined. For a more thorough description of what the Parser is designed to do, please consult the Ptolemy II design document (or contact nsmyth@eecs)
Note that the parsers created by JavaCC generally have quite a bit of internal state. On the other hand, the parse trees generated by this parser are much smaller. It is also fairly cheap to traverse a parse tree in order to evaluate it. Thus it is usually preferable to cache parse trees and create a new parser when the cached parse tree becomes invalid. @author Neil Smyth, Steve Neuendorffer @version $Id: PtParser.java,v 1.143.4.1 2008/03/25 22:31:39 cxh Exp $ @since Ptolemy II 1.0 @Pt.ProposedRating Yellow (nsmyth) @Pt.AcceptedRating Yellow (yuhong) @see ptolemy.data.expr.ASTPtBitwiseNode @see ptolemy.data.expr.ASTPtFunctionApplicationNode @see ptolemy.data.expr.ASTPtFunctionDefinitionNode @see ptolemy.data.expr.ASTPtFunctionalIfNode @see ptolemy.data.expr.ASTPtLeafNode @see ptolemy.data.expr.ASTPtLogicalNode @see ptolemy.data.expr.ASTPtMethodCallNode @see ptolemy.data.expr.ASTPtProductNode @see ptolemy.data.expr.ASTPtRelationalNode @see ptolemy.data.expr.ASTPtRootNode @see ptolemy.data.expr.ASTPtSumNode @see ptolemy.data.expr.ASTPtUnaryNode @see ptolemy.data.Token

Examples of ptolemy.data.expr.PtParser

     *  @param init A string expression of a 2-D fix matrix.
     *  @exception IllegalActionException If the string does
     *   not contain a parsable 2-D fix matrix.
     */
    public FixMatrixToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);


        if (token instanceof FixMatrixToken) {
            FixPoint[][] value = ((FixMatrixToken) token).fixMatrix();
            _initialize(value, null);

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Examples of ptolemy.data.expr.PtParser

     *   expression language syntax.
     *  @exception IllegalActionException If the string does
     *   not contain a parsable fixed point number.
     */
    public FixToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);


        if (token instanceof FixToken) {
            _value = ((FixToken) token).fixValue();
        } else {

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Examples of ptolemy.data.expr.PtParser

     *  @param init A string expression of a 2-D complex matrix.
     *  @exception IllegalActionException If the string does
     *   not contain a parsable 2-D complex matrix.
     */
    public ComplexMatrixToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);


        if (token instanceof ComplexMatrixToken) {
            Complex[][] value = ((ComplexMatrixToken) token).complexMatrix();
            _initialize(value, DO_COPY);

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Examples of ptolemy.data.expr.PtParser

     *  @param init A string expression of a 2-D long matrix.
     *  @exception IllegalActionException If the string does
     *   not contain a parsable 2-D long matrix.
     */
    public LongMatrixToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);


        if (token instanceof LongMatrixToken) {
            long[][] value = ((LongMatrixToken) token).longMatrix();
            _initialize(value, DO_COPY);

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Examples of ptolemy.data.expr.PtParser

     *  @param init A string expression of a 2-D int matrix.
     *  @exception IllegalActionException If the string does
     *   not contain a parsable 2-D int matrix.
     */
    public IntMatrixToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);


        if (token instanceof IntMatrixToken) {
            int[][] value = ((IntMatrixToken) token).intMatrix();
            _initialize(value);

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Examples of ptolemy.data.expr.PtParser

     *  <code>function(x,y) 4+x+y</code>.
     *  @exception IllegalActionException If an error occurs, or the
     *  string cannot be parsed into a function.
     */
    public FunctionToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        ParseTreeTypeInference inference = new ParseTreeTypeInference();
        inference.inferTypes(tree);


        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);

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Examples of ptolemy.data.expr.PtParser

     *  @param init A string expression of a 2-D double matrix.
     *  @exception IllegalActionException If the string does
     *   not contain a parsable 2-D double matrix.
     */
    public DoubleMatrixToken(String init) throws IllegalActionException {
        PtParser parser = new PtParser();
        ASTPtRootNode tree = parser.generateParseTree(init);
        Token token = (new ParseTreeEvaluator()).evaluateParseTree(tree);


        if (token instanceof DoubleMatrixToken) {
            double[][] value = ((DoubleMatrixToken) token).doubleMatrix();
            _initialize(value);

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Examples of ptolemy.data.expr.PtParser

            SootClass entityClass, String expression, Map nameToFieldOrLocal,
            Map nameToType, JimpleBody body, Unit insertPoint) {
        Local local;


        try {
            PtParser parser = new PtParser();
            ASTPtRootNode parseTree = parser.generateParseTree(expression);
            ActorCodeGenerationScope scope = new ActorCodeGenerationScope(
                    entity, entityClass, nameToFieldOrLocal, nameToType, body,
                    insertPoint);
            ParseTreeCodeGenerator generator = new ParseTreeCodeGenerator();
            local = generator.generateCode(parseTree, body, insertPoint, scope);

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Examples of ptolemy.data.expr.PtParser


        try {
            // Note that the parser is NOT retained, since in most
            // cases the expression doesn't change, and the parser
            // requires a large amount of memory.
            PtParser parser = new PtParser();
            ASTPtRootNode parseTree = parser.generateParseTree(actor.expression
                    .getExpression());


            _cParseTreeCodeGenerator.evaluateParseTree(parseTree,
                    new VariableScope(actor));
        } catch (IllegalActionException ex) {

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Examples of ptolemy.data.expr.PtParser

                    throw new PtalonRuntimeException(
                            "Unable to set token for name " + paramName, ex);
                }
            }
            try {
                PtParser parser = new PtParser();
                ParseTreeEvaluator _parseTreeEvaluator = new ParseTreeEvaluator();
                for (String parameterName : _parameters.keySet()) {
                    String expression = _parameters.get(parameterName);
                    if (expression == null) {
                        throw new PtalonRuntimeException(
                                "Unable to find expression label for "
                                        + "parameter " + parameterName);
                    }
                    ASTPtRootNode _parseTree = parser
                            .generateParseTree(expression);
                    Parameter parameter = (Parameter) actor
                            .getAttribute(parameterName);
                    if (parameter == null) {
                        String uniqueName = actor.uniqueName(parameterName);

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