1// Copyright (c) 2008, Google Inc.
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3//
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5// modification, are permitted provided that the following conditions are
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12// in the documentation and/or other materials provided with the
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17//
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28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30#include "config.h"
31#include "bindings/core/v8/custom/V8CustomXPathNSResolver.h"
32
33#include "bindings/core/v8/ScriptController.h"
34#include "bindings/core/v8/V8Binding.h"
35#include "core/dom/ExecutionContext.h"
36#include "core/frame/FrameConsole.h"
37#include "core/frame/FrameHost.h"
38#include "core/frame/LocalDOMWindow.h"
39#include "core/frame/LocalFrame.h"
40#include "core/inspector/ConsoleMessage.h"
41#include "core/inspector/ScriptCallStack.h"
42#include "wtf/text/WTFString.h"
43
44namespace blink {
45
46PassRefPtrWillBeRawPtr<V8CustomXPathNSResolver> V8CustomXPathNSResolver::create(v8::Handle<v8::Object> resolver, v8::Isolate* isolate)
47{
48    return adoptRefWillBeNoop(new V8CustomXPathNSResolver(resolver, isolate));
49}
50
51V8CustomXPathNSResolver::V8CustomXPathNSResolver(v8::Handle<v8::Object> resolver, v8::Isolate* isolate)
52    : m_resolver(resolver)
53    , m_isolate(isolate)
54{
55}
56
57AtomicString V8CustomXPathNSResolver::lookupNamespaceURI(const String& prefix)
58{
59    v8::Handle<v8::Function> lookupNamespaceURIFunc;
60    v8::Handle<v8::String> lookupNamespaceURIName = v8AtomicString(m_isolate, "lookupNamespaceURI");
61
62    // Check if the resolver has a function property named lookupNamespaceURI.
63    if (m_resolver->Has(lookupNamespaceURIName)) {
64        v8::Handle<v8::Value> lookupNamespaceURI = m_resolver->Get(lookupNamespaceURIName);
65        if (lookupNamespaceURI->IsFunction())
66            lookupNamespaceURIFunc = v8::Handle<v8::Function>::Cast(lookupNamespaceURI);
67    }
68
69    if (lookupNamespaceURIFunc.IsEmpty() && !m_resolver->IsFunction()) {
70        LocalFrame* frame = callingDOMWindow(m_isolate)->frame();
71        if (frame && frame->host())
72            frame->console().addMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, "XPathNSResolver does not have a lookupNamespaceURI method."));
73        return nullAtom;
74    }
75
76    // Catch exceptions from calling the namespace resolver.
77    v8::TryCatch tryCatch;
78    tryCatch.SetVerbose(true); // Print exceptions to console.
79
80    const int argc = 1;
81    v8::Handle<v8::Value> argv[argc] = { v8String(m_isolate, prefix) };
82    v8::Handle<v8::Function> function = lookupNamespaceURIFunc.IsEmpty() ? v8::Handle<v8::Function>::Cast(m_resolver) : lookupNamespaceURIFunc;
83
84    v8::Handle<v8::Value> retval = ScriptController::callFunction(callingExecutionContext(m_isolate), function, m_resolver, argc, argv, m_isolate);
85
86    // Eat exceptions from namespace resolver and return an empty string. This will most likely cause NamespaceError.
87    if (tryCatch.HasCaught())
88        return nullAtom;
89
90    TOSTRING_DEFAULT(V8StringResource<TreatNullAsNullString>, returnString, retval, nullAtom);
91    return returnString;
92}
93
94void V8CustomXPathNSResolver::trace(Visitor* visitor)
95{
96    XPathNSResolver::trace(visitor);
97}
98
99} // namespace blink
100