Examples of jmathexpr.util.pattern.ExpressionPattern.matches()

Class jmathexpr.util.pattern.ExpressionPattern

Examples of jmathexpr.util.pattern.ExpressionPattern.matches()

jmathexpr.util.pattern.ExpressionPattern.matches()
Tests whether this pattern matches the given expression. Constants and variables in the pattern must be substituted if this method returns true. @param expr an arbitrary expression @return true if this pattern matches the given expression

    }
    
    public static boolean isLinear(Expression expr, Variable x) {
        ExpressionPattern pattern = new PolynomialTermPattern(x, 1);
        
        if (pattern.matches(expr)) {
            return true;
        } else if (expr instanceof Negation) {
            return isLinear(((Negation) expr).getChild(), x);
        } else if (expr instanceof Division) {
            Expression lhs = ((Division) expr).lhs();

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        NavigableMap<NaturalNumber, Expression> coeffs = new TreeMap();
        TerminationPattern c = Numbers.constant("c");
        TerminationPattern n = Numbers.constant("n");
        ExpressionPattern cxn = new Multiplication(c, new Exponentiation(x, n));


        if (cxn.matches(term)) {
            coeffs.put((NaturalNumber) n.hit(), c.hit());
        } else {
            throw new IllegalArgumentException("Illegal polynomial term: " + term);
        }

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        for (Expression e : evaluated) {
            if (e.isConstant()) {
                if (e instanceof ANumber) { // 1 -> numbers
                    addToSelectionMap(selected, Naturals.one(), (ANumber) e);
                } else if (p.matches(e)) {
                    addToSelectionMap(selected, c.hit(), a.hit());
                } else {
                    addToSelectionMap(selected, e, Naturals.one());
                }
            }

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        ExpressionPattern p = new Multiplication(c, f);
        
        for (Expression e : evaluated) {
            if (e.isConstant()) {
                continue;
            } else if (p.matches(e)) {
                addToSelectionMap(selected, f.hit(), c.hit());
            } else {
                addToSelectionMap(selected, e, Naturals.one());
            }
        }

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                p = (ExpressionPattern) terms.get(i);
                
                if (p instanceof AnyPattern && i == terms.size() - 1) {
                    Sum rest = new Sum(expressions);
                    
                    return p.matches(rest);
                }
                
                for (int j = 0; j < expressions.size(); j++) { // ... to find a matching term
                    e = expressions.get(j);

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                }
                
                for (int j = 0; j < expressions.size(); j++) { // ... to find a matching term
                    e = expressions.get(j);


                    if (p.matches(e)) {
                        matchingPatterns.put(i, e);
                        expressions.remove(j);


                        return true;
                    }

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    private static boolean isQuadratic(Expression expr, Variable x) {
        NaturalNumber two = Naturals.getInstance().create(2);
        ExpressionPattern pattern = new PolynomialTermPattern(x, 2);
        
        if (pattern.matches(expr)) {
            return true;
        } else if (expr instanceof Negation) {
            return isQuadratic(((Negation) expr).getChild(), x);
        } else if (expr instanceof Division) {
            Expression lhs = ((Division) expr).lhs();

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