Examples with Expr org.eclipse.wst.xml.xpath2.processor.internal.ast.Expr used on opensource projects

Example 11 with Expr

use of org.eclipse.wst.xml.xpath2.processor.internal.ast.Expr in project webtools.sourceediting by eclipse.

the class DefaultEvaluator method visit.

/**
 * visit function call.
 *
 * @param e
 *            is the function call.
 * @return a new function or null
 */
public Object visit(FunctionCall e) {
    ArrayList args = new ArrayList();
    for (Iterator i = e.iterator(); i.hasNext(); ) {
        Expr arg = (Expr) i.next();
        // each argument will produce a result sequence
        args.add((ResultSequence) arg.accept(this));
    }
    try {
        Function function = e.function();
        if (function == null) {
            function = _sc.resolveFunction(e.name().asQName(), args.size());
            e.set_function(function);
        }
        return function.evaluate(args, _ec);
    } catch (DynamicError err) {
        report_error(err);
        // unreach
        return null;
    }
}

Example 12 with Expr

use of org.eclipse.wst.xml.xpath2.processor.internal.ast.Expr in project webtools.sourceediting by eclipse.

the class DefaultEvaluator method do_predicate.

// do the predicate for all items in focus
private ResultSequence do_predicate(Collection exprs) {
    ResultBuffer rs = new ResultBuffer();
    Focus focus = focus();
    int original_cp = focus.position();
    // check if predicate is single numeric constant
    if (exprs.size() == 1) {
        Expr expr = (Expr) exprs.iterator().next();
        if (expr instanceof XPathExpr) {
            XPathExpr xpe = (XPathExpr) expr;
            if (xpe.next() == null && xpe.slashes() == 0 && xpe.expr() instanceof FilterExpr) {
                FilterExpr fex = (FilterExpr) xpe.expr();
                if (fex.primary() instanceof IntegerLiteral) {
                    int pos = (((IntegerLiteral) fex.primary()).value().int_value()).intValue();
                    if (pos <= focus.last() && pos > 0) {
                        focus.set_position(pos);
                        rs.add(focus.context_item());
                    }
                    focus.set_position(original_cp);
                    return rs.getSequence();
                }
            }
        }
    }
    // go through all elements
    while (true) {
        // do the predicate
        // XXX saxon doesn't allow for predicates to have
        // commas... but XPath 2.0 spec seems to do
        ResultSequence res = do_expr(exprs.iterator());
        // in the sequence
        if (predicate_truth(res))
            rs.add(focus().context_item());
        if (!focus.advance_cp())
            break;
    }
    // restore
    focus.set_position(original_cp);
    return rs.getSequence();
}

Example 13 with Expr

use of org.eclipse.wst.xml.xpath2.processor.internal.ast.Expr in project webtools.sourceediting by eclipse.

the class StaticNameResolver method visitExprs.

private void visitExprs(Iterator i) {
    while (i.hasNext()) {
        Expr e = (Expr) i.next();
        e.accept(this);
    }
}

Example 14 with Expr

use of org.eclipse.wst.xml.xpath2.processor.internal.ast.Expr in project webtools.sourceediting by eclipse.

the class Normalizer method visit.

/**
 * @param qex
 *            is the Quantified expression.
 * @return qex expression.
 */
// XXX: code duplication
public Object visit(QuantifiedExpr qex) {
    QuantifiedExpr last = qex;
    Expr ret = qex.expr();
    int depth = 0;
    for (Iterator i = qex.iterator(); i.hasNext(); ) {
        VarExprPair ve = (VarExprPair) i.next();
        // ok we got nested fors...
        if (depth > 0) {
            Collection pairs = new ArrayList();
            pairs.add(ve);
            QuantifiedExpr qe = new QuantifiedExpr(qex.type(), pairs, ret);
            last.set_expr(qe);
            last = qe;
        }
        depth++;
    }
    // normalize return value, and set it to the last for expr
    ret.accept(this);
    // get rid of the pairs in the parent (original) for
    if (depth > 1)
        qex.truncate_pairs();
    return qex;
}

Example 15 with Expr

use of org.eclipse.wst.xml.xpath2.processor.internal.ast.Expr in project webtools.sourceediting by eclipse.

the class Normalizer method doForExpr.

// does a for and a quantified expression
// takes the iterator for var expr paris
private void doForExpr(Iterator iter, Expr expr) {
    Collection vars = new ArrayList();
    // go through expression and cache variables
    while (iter.hasNext()) {
        VarExprPair pair = (VarExprPair) iter.next();
        QName var = pair.varname();
        Expr e = pair.expr();
        // XXX this is wrong!
        // need to define new scope, and reference "inner scope"
        // [shadow outer vars]
        /*
			 * if(_sc.variable_exists(var)) report_error(new
			 * StaticNameError("Variable " + var.string() +
			 * " already defined"));
			 */
        // ok we can cheat here cuz we only care about variable
        // "presence" not its specific instance / value so we
        // can fakely shadow without creating explicit scopes
        // if variable already exists.... then leave it there...
        // [we do not need to create a new instance and delete
        // it at the end]
        // we only need to if variable does not exist
        // XXX: i fink this is all wrong
        vars.add(var);
        e.accept(this);
    }
    // add variables to scope
    for (Iterator i = vars.iterator(); i.hasNext(); ) {
        QName var = (QName) i.next();
    }
    // do the bounded expression
    expr.accept(this);
// remove variables
}