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#include "qpatternistlocale_p.h"

#include "qabstractfunctionfactory_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

Expression::Ptr AbstractFunctionFactory::createFunctionCall(const QXmlName name,
                                                            const Expression::List &args,
                                                            const StaticContext::Ptr &context,
                                                            const SourceLocationReflection *const r)
{
    const FunctionSignature::Ptr sign(retrieveFunctionSignature(context->namePool(), name));

    if(!sign) /* The function doesn't exist(at least not in this factory). */
        return Expression::Ptr();

    /* May throw. */
    verifyArity(sign, context, args.count(), r);

    /* Ok, the function does exist and the arity is correct. */
    return retrieveExpression(name, args, sign);
}

void AbstractFunctionFactory::verifyArity(const FunctionSignature::Ptr &s,
                                          const StaticContext::Ptr &context,
                                          const xsInteger arity,
                                          const SourceLocationReflection *const r) const
{
    /* Same code in both branches, but more specific error messages in order
     * to improve usability. */
    if(s->maximumArguments() != FunctionSignature::UnlimitedArity &&
       arity > s->maximumArguments())
    {
        context->error(QtXmlPatterns::tr("%1 takes at most %n argument(s). "
                                         "%2 is therefore invalid.", 0, s->maximumArguments())
                          .arg(formatFunction(context->namePool(), s))
                          .arg(arity),
                       ReportContext::XPST0017,
                       r);
        return;
    }

    if(arity < s->minimumArguments())
    {
        context->error(QtXmlPatterns::tr("%1 requires at least %n argument(s). "
                                         "%2 is therefore invalid.", 0, s->minimumArguments())
                          .arg(formatFunction(context->namePool(), s))
                          .arg(arity),
                       ReportContext::XPST0017,
                       r);
        return;
    }
}

FunctionSignature::Hash AbstractFunctionFactory::functionSignatures() const
{
    return m_signatures;
}

QT_END_NAMESPACE
