1 // Copyright (c) 2008, Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 // * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 #include "config.h"
31 #include "V8CustomXPathNSResolver.h"
32
33 #if ENABLE(XPATH)
34
35 #include "PlatformString.h"
36 #include "V8Binding.h"
37 #include "V8Proxy.h"
38
39 namespace WebCore {
40
create(v8::Handle<v8::Object> resolver)41 PassRefPtr<V8CustomXPathNSResolver> V8CustomXPathNSResolver::create(v8::Handle<v8::Object> resolver)
42 {
43 return adoptRef(new V8CustomXPathNSResolver(resolver));
44 }
45
V8CustomXPathNSResolver(v8::Handle<v8::Object> resolver)46 V8CustomXPathNSResolver::V8CustomXPathNSResolver(v8::Handle<v8::Object> resolver)
47 : m_resolver(resolver)
48 {
49 }
50
~V8CustomXPathNSResolver()51 V8CustomXPathNSResolver::~V8CustomXPathNSResolver()
52 {
53 }
54
lookupNamespaceURI(const String & prefix)55 String V8CustomXPathNSResolver::lookupNamespaceURI(const String& prefix)
56 {
57 v8::Handle<v8::Function> lookupNamespaceURIFunc;
58 v8::Handle<v8::String> lookupNamespaceURIName = v8::String::New("lookupNamespaceURI");
59
60 // Check if the resolver has a function property named lookupNamespaceURI.
61 if (m_resolver->Has(lookupNamespaceURIName)) {
62 v8::Handle<v8::Value> lookupNamespaceURI = m_resolver->Get(lookupNamespaceURIName);
63 if (lookupNamespaceURI->IsFunction())
64 lookupNamespaceURIFunc = v8::Handle<v8::Function>::Cast(lookupNamespaceURI);
65 }
66
67 if (lookupNamespaceURIFunc.IsEmpty() && !m_resolver->IsFunction()) {
68 Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
69 logInfo(frame, "XPathNSResolver does not have a lookupNamespaceURI method.", String());
70 return String();
71 }
72
73 // Catch exceptions from calling the namespace resolver.
74 v8::TryCatch try_catch;
75 try_catch.SetVerbose(true); // Print exceptions to console.
76
77 const int argc = 1;
78 v8::Handle<v8::Value> argv[argc] = { v8String(prefix) };
79 v8::Handle<v8::Function> function = lookupNamespaceURIFunc.IsEmpty() ? v8::Handle<v8::Function>::Cast(m_resolver) : lookupNamespaceURIFunc;
80
81 V8Proxy* proxy = V8Proxy::retrieve();
82 v8::Handle<v8::Value> retval = proxy->callFunction(function, m_resolver, argc, argv);
83
84 // Eat exceptions from namespace resolver and return an empty string. This will most likely cause NAMESPACE_ERR.
85 if (try_catch.HasCaught())
86 return String();
87
88 return toWebCoreStringWithNullCheck(retval);
89 }
90
91 } // namespace WebCore
92
93 #endif // ENABLE(XPATH)
94