V8CustomXPathNSResolver.cpp   [plain text]

// Copyright (c) 2008, Google Inc.
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//
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// modification, are permitted provided that the following conditions are
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// notice, this list of conditions and the following disclaimer.
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// distribution.
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//
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#include "config.h"
#include "V8CustomXPathNSResolver.h"

#if ENABLE(XPATH)

#include "PlatformString.h"
#include "V8Binding.h"
#include "V8Proxy.h"

namespace WebCore {

PassRefPtr<V8CustomXPathNSResolver> V8CustomXPathNSResolver::create(V8Proxy* proxy, v8::Handle<v8::Object> resolver)
{
    return adoptRef(new V8CustomXPathNSResolver(proxy, resolver));
}

V8CustomXPathNSResolver::V8CustomXPathNSResolver(V8Proxy* proxy, v8::Handle<v8::Object> resolver)
        : m_proxy(proxy)
        , m_resolver(resolver)
{
}

V8CustomXPathNSResolver::~V8CustomXPathNSResolver()
{
}

String V8CustomXPathNSResolver::lookupNamespaceURI(const String& prefix)
{
    V8Proxy* proxy = m_proxy;

    if (!proxy) {
        proxy = V8Proxy::retrieve();
        if (!proxy)
            return String();
    }

    v8::Handle<v8::Function> lookupNamespaceURIFunc;
    v8::Handle<v8::String> lookupNamespaceURIName = v8::String::New("lookupNamespaceURI");

    // Check if the resolver has a function property named lookupNamespaceURI.
    if (m_resolver->Has(lookupNamespaceURIName)) {
        v8::Handle<v8::Value> lookupNamespaceURI = m_resolver->Get(lookupNamespaceURIName);
        if (lookupNamespaceURI->IsFunction())
            lookupNamespaceURIFunc = v8::Handle<v8::Function>::Cast(lookupNamespaceURI);
    }

    if (lookupNamespaceURIFunc.IsEmpty() && !m_resolver->IsFunction()) {
        Frame* frame = proxy->frame();
        logInfo(frame, "XPathNSResolver does not have a lookupNamespaceURI method.", String());
        return String();
    }

    // Catch exceptions from calling the namespace resolver.
    v8::TryCatch try_catch;
    try_catch.SetVerbose(true);  // Print exceptions to console.

    const int argc = 1;
    v8::Handle<v8::Value> argv[argc] = { v8String(prefix) };
    v8::Handle<v8::Function> function = lookupNamespaceURIFunc.IsEmpty() ? v8::Handle<v8::Function>::Cast(m_resolver) : lookupNamespaceURIFunc;

    v8::Handle<v8::Value> retval = proxy->callFunction(function, m_resolver, argc, argv);

    // Eat exceptions from namespace resolver and return an empty string. This will most likely cause NAMESPACE_ERR.
    if (try_catch.HasCaught())
        return String();

    return toWebCoreStringWithNullCheck(retval);
}

} // namespace WebCore

#endif // ENABLE(XPATH)