Examples of org.apache.commons.jexl2.parser.JexlNode

org.apache.commons.jexl2.parser.JexlNode
Base class for parser nodes - holds an 'image' of the token for later use. @since 2.0

    /** {@inheritDoc} */
    public Object visit(ASTBlock node, Object data) {
        builder.append("{ ");
        int num = node.jjtGetNumChildren();
        for (int i = 0; i < num; ++i) {
            JexlNode child = node.jjtGetChild(i);
            acceptStatement(child, data);
        }
        builder.append(" }");
        return data;
    }

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    /** {@inheritDoc} */
    public Object visit(ASTJexlScript node, Object data) {
        int num = node.jjtGetNumChildren();
        for (int i = 0; i < num; ++i) {
            JexlNode child = node.jjtGetChild(i);
            acceptStatement(child, data);
        }
        return data;
    }

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        return data;
    }


    /** {@inheritDoc} */
    public Object visit(ASTReferenceExpression node, Object data) {
        JexlNode first = node.jjtGetChild(0);
        builder.append('(');
        accept(first, data);
        builder.append(')');
        int num = node.jjtGetNumChildren();
        for (int i = 1; i < num; ++i) {

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         */
        Object left = node.jjtGetChild(0).jjtAccept(this, data);
        for (int c = 2, size = node.jjtGetNumChildren(); c < size; c += 2) {
            Object right = node.jjtGetChild(c).jjtAccept(this, data);
            try {
                JexlNode op = node.jjtGetChild(c - 1);
                if (op instanceof ASTAdditiveOperator) {
                    String which = op.image;
                    if ("+".equals(which)) {
                        left = arithmetic.add(left, right);
                        continue;
                    }
                    if ("-".equals(which)) {
                        left = arithmetic.subtract(left, right);
                        continue;
                    }
                    throw new UnsupportedOperationException("unknown operator " + which);
                }
                throw new IllegalArgumentException("unknown operator " + op);
            } catch (ArithmeticException xrt) {
                JexlNode xnode = findNullOperand(xrt, node, left, right);
                throw new JexlException(xnode, "+/- error", xrt);
            }
        }
        return left;
    }

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        // first objectNode is the identifier
        Object object = node.jjtGetChild(0).jjtAccept(this, data);
        // can have multiple nodes - either an expression, integer literal or reference
        int numChildren = node.jjtGetNumChildren();
        for (int i = 1; i < numChildren; i++) {
            JexlNode nindex = node.jjtGetChild(i);
            if (nindex instanceof JexlNode.Literal<?>) {
                object = nindex.jjtAccept(this, object);
            } else {
                Object index = nindex.jjtAccept(this, null);
                object = getAttribute(object, index, nindex);
            }
        }


        return object;

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    /** {@inheritDoc} */
    public Object visit(ASTAssignment node, Object data) {
        // left contains the reference to assign to
        int register = -1;
        JexlNode left = node.jjtGetChild(0);
        if (left instanceof ASTIdentifier) {
            ASTIdentifier var = (ASTIdentifier) left;
            register = var.getRegister();
            if (register < 0) {
                throw new JexlException(left, "unknown variable " + left.image);
            }
        } else if (!(left instanceof ASTReference)) {
            throw new JexlException(left, "illegal assignment form 0");
        }
        // right is the value expression to assign
        Object right = node.jjtGetChild(1).jjtAccept(this, data);


        // determine initial object & property:
        JexlNode objectNode = null;
        Object object = register >= 0 ? registers[register] : null;
        JexlNode propertyNode = null;
        Object property = null;
        boolean isVariable = true;
        int v = 0;
        StringBuilder variableName = null;
        // 1: follow children till penultimate, resolve dot/array

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            return arithmetic.divide(left, right);
        } catch (ArithmeticException xrt) {
            if (!strict) {
                return new Double(0.0);
            }
            JexlNode xnode = findNullOperand(xrt, node, left, right);
            throw new JexlException(xnode, "divide error", xrt);
        }
    }

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        /* second objectNode is the variable to iterate */
        Object iterableValue = node.jjtGetChild(1).jjtAccept(this, data);
        // make sure there is a value to iterate on and a statement to execute
        if (iterableValue != null && node.jjtGetNumChildren() >= 3) {
            /* third objectNode is the statement to execute */
            JexlNode statement = node.jjtGetChild(2);
            // get an iterator for the collection/array etc via the
            // introspector.
            Iterator<?> itemsIterator = uberspect.getIterator(iterableValue, node);
            if (itemsIterator != null) {
                while (itemsIterator.hasNext()) {
                    if (isCancelled()) {
                        throw new JexlException.Cancel(node);
                    }
                    // set loopVariable to value of iterator
                    Object value = itemsIterator.next();
                    if (register < 0) {
                        context.set(loopVariable.image, value);
                    } else {
                        registers[register] = value;
                    }
                    // execute statement
                    result = statement.jjtAccept(this, data);
                }
            }
        }
        return result;
    }

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    /** {@inheritDoc} */
    public Object visit(ASTJexlScript node, Object data) {
        int numChildren = node.jjtGetNumChildren();
        Object result = null;
        for (int i = 0; i < numChildren; i++) {
            JexlNode child = node.jjtGetChild(i);
            result = child.jjtAccept(this, data);
        }
        return result;
    }

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            return arithmetic.mod(left, right);
        } catch (ArithmeticException xrt) {
            if (!strict) {
                return new Double(0.0);
            }
            JexlNode xnode = findNullOperand(xrt, node, left, right);
            throw new JexlException(xnode, "% error", xrt);
        }
    }

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