Examples with HashValueVisitor org.matheclipse.core.visit.HashValueVisitor used on opensource projects

Example 1 with HashValueVisitor

use of org.matheclipse.core.visit.HashValueVisitor in project symja_android_library by axkr.

the class HashedOrderlessMatcher method evaluateRepeated.

/**
	 * Evaluate an <code>Orderless</code> AST with the defined
	 * <code>HashedPatternRules</code> as long as the header of the given
	 * expression equals the evaluated expression.
	 * 
	 * @param orderlessAST
	 * @return
	 * @see HashedPatternRules
	 */
public IAST evaluateRepeated(final IAST orderlessAST) {
    if (orderlessAST.isEvalFlagOn(IAST.IS_HASH_EVALED)) {
        return F.NIL;
    }
    IAST temp = orderlessAST;
    if (checkMinimmumASTs(temp)) {
        boolean evaled = false;
        int[] hashValues;
        if (!fPatternHashRuleMap.isEmpty()) {
            IExpr head = orderlessAST.head();
            IAST result = F.NIL;
            while (temp.isPresent()) {
                hashValues = new int[(temp.size() - 1)];
                HashValueVisitor v = new HashValueVisitor();
                for (int i = 0; i < hashValues.length; i++) {
                    hashValues[i] = temp.get(i + 1).accept(v);
                    v.setUp();
                }
                result = evaluateHashedValues(temp, fPatternHashRuleMap, hashValues);
                if (result.isPresent()) {
                    temp = result;
                    evaled = true;
                    if (!temp.head().equals(head)) {
                        temp.setEvalFlags(IAST.IS_HASH_EVALED);
                        return temp;
                    }
                } else {
                    break;
                }
            }
        }
        if (!fHashRuleMap.isEmpty()) {
            hashValues = new int[(temp.size() - 1)];
            for (int i = 0; i < hashValues.length; i++) {
                hashValues[i] = temp.get(i + 1).head().hashCode();
            }
            IAST result = evaluateHashedValues(temp, fHashRuleMap, hashValues);
            if (result.isPresent()) {
                result.setEvalFlags(IAST.IS_HASH_EVALED);
                return result;
            }
        }
        if (evaled) {
            temp.setEvalFlags(IAST.IS_HASH_EVALED);
            return temp;
        }
    }
    orderlessAST.setEvalFlags(IAST.IS_HASH_EVALED);
    return F.NIL;
}

Example 2 with HashValueVisitor

use of org.matheclipse.core.visit.HashValueVisitor in project symja_android_library by axkr.

the class HashedOrderlessMatcher method evaluate.

/**
	 * Evaluate an <code>Orderless</code> AST only once with the defined
	 * <code>HashedPatternRules</code>.
	 * 
	 * @param orderlessAST
	 * @return
	 * @see HashedPatternRules
	 */
public IAST evaluate(final IAST orderlessAST) {
    // TODO Performance hotspot
    int[] hashValues = new int[(orderlessAST.size() - 1)];
    if (!fPatternHashRuleMap.isEmpty()) {
        HashValueVisitor v = new HashValueVisitor();
        for (int i = 0; i < hashValues.length; i++) {
            hashValues[i] = orderlessAST.get(i + 1).accept(v);
            v.setUp();
        }
        IAST result = evaluateHashedValues(orderlessAST, fPatternHashRuleMap, hashValues);
        if (result.isPresent()) {
            return result;
        }
    }
    if (!fHashRuleMap.isEmpty()) {
        for (int i = 0; i < hashValues.length; i++) {
            hashValues[i] = orderlessAST.get(i + 1).head().hashCode();
        }
        return evaluateHashedValues(orderlessAST, fHashRuleMap, hashValues);
    }
    return F.NIL;
}