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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef V8_BINDING_H__ | |
6 #define V8_BINDING_H__ | |
7 | |
8 #include "config.h" | |
9 | |
10 #include "MathExtras.h" | |
11 #include "PlatformString.h" | |
12 | |
13 #include <v8.h> | |
14 | |
15 namespace WebCore { | |
16 | |
17 // The string returned by this function is still owned by the argument | |
18 // and will be deallocated when the argument is deallocated. | |
19 inline const uint16_t* FromWebCoreString(const String& str) { | |
20 return reinterpret_cast<const uint16_t*>(str.characters()); | |
21 } | |
22 | |
23 // Convert v8 types to a WebCore::String. If the V8 string is not already | |
24 // an external string then it is transformed into an external string at this | |
25 // point to avoid repeated conversions. | |
26 String v8StringToWebCoreString( | |
27 v8::Handle<v8::String> obj, bool externalize); | |
28 String v8ValueToWebCoreString(v8::Handle<v8::Value> obj); | |
29 | |
30 // TODO(mbelshe): drop this in favor of the type specific | |
31 // v8ValueToWebCoreString when we rework the code generation. | |
32 inline String ToWebCoreString(v8::Handle<v8::Value> obj) { | |
33 return v8ValueToWebCoreString(obj); | |
34 } | |
35 | |
36 inline String ToWebCoreString(v8::Handle<v8::String> string) { | |
37 return v8StringToWebCoreString(string, true); | |
38 } | |
39 | |
40 // Convert v8 types to a WebCore::AtomicString. | |
41 AtomicString v8StringToAtomicWebCoreString(v8::Handle<v8::String> obj); | |
42 AtomicString v8ValueToAtomicWebCoreString(v8::Handle<v8::Value> obj); | |
43 | |
44 inline String valueToStringWithNullCheck(v8::Handle<v8::Value> value) { | |
45 if (value->IsNull()) return String(); | |
46 return ToWebCoreString(value); | |
47 } | |
48 | |
49 inline String valueToStringWithNullOrUndefinedCheck( | |
50 v8::Handle<v8::Value> value) { | |
51 if (value->IsNull() || value->IsUndefined()) return String(); | |
52 return ToWebCoreString(value); | |
53 } | |
54 | |
55 // Convert a value to a 32-bit integer. The conversion fails if the | |
56 // value cannot be converted to an integer or converts to nan or to an | |
57 // infinity. | |
58 // FIXME: Rename to toInt32() once V8 bindings migration is complete. | |
59 inline int ToInt32(v8::Handle<v8::Value> value, bool& ok) { | |
60 ok = true; | |
61 | |
62 // Fast case. The value is already a 32-bit integer. | |
63 if (value->IsInt32()) { | |
64 return value->Int32Value(); | |
65 } | |
66 | |
67 // Can the value be converted to a number? | |
68 v8::Local<v8::Number> number_object = value->ToNumber(); | |
69 if (number_object.IsEmpty()) { | |
70 ok = false; | |
71 return 0; | |
72 } | |
73 | |
74 // Does the value convert to nan or to an infinity? | |
75 double number_value = number_object->Value(); | |
76 if (isnan(number_value) || isinf(number_value)) { | |
77 ok = false; | |
78 return 0; | |
79 } | |
80 | |
81 // Can the value be converted to a 32-bit integer? | |
82 v8::Local<v8::Int32> int_value = value->ToInt32(); | |
83 if (int_value.IsEmpty()) { | |
84 ok = false; | |
85 return 0; | |
86 } | |
87 | |
88 // Return the result of the int32 conversion. | |
89 return int_value->Value(); | |
90 } | |
91 | |
92 // Convert a value to a 32-bit integer assuming the conversion cannot fail. | |
93 // FIXME: Rename to toInt32() once V8 bindings migration is complete. | |
94 inline int ToInt32(v8::Handle<v8::Value> value) { | |
95 bool ok; | |
96 return ToInt32(value, ok); | |
97 } | |
98 | |
99 inline String ToString(const String& string) { | |
100 return string; | |
101 } | |
102 | |
103 // Convert a string to a V8 string. | |
104 v8::Handle<v8::String> v8String(const String& str); | |
105 | |
106 inline v8::Handle<v8::String> v8UndetectableString(const String& str) { | |
107 return v8::String::NewUndetectable(FromWebCoreString(str), str.length()); | |
108 } | |
109 | |
110 // Return a V8 external string that shares the underlying buffer with the given | |
111 // WebCore string. The reference counting mechanism is used to keep the | |
112 // underlying buffer alive while the string is still live in the V8 engine. | |
113 v8::Local<v8::String> v8ExternalString(const String& str); | |
114 | |
115 inline v8::Handle<v8::Value> v8StringOrNull(const String& str) { | |
116 return str.isNull() | |
117 ? v8::Handle<v8::Value>(v8::Null()) | |
118 : v8::Handle<v8::Value>(v8String(str)); | |
119 } | |
120 | |
121 inline v8::Handle<v8::Value> v8StringOrUndefined(const String& str) { | |
122 return str.isNull() | |
123 ? v8::Handle<v8::Value>(v8::Undefined()) | |
124 : v8::Handle<v8::Value>(v8String(str)); | |
125 } | |
126 | |
127 inline v8::Handle<v8::Value> v8StringOrFalse(const String& str) { | |
128 return str.isNull() | |
129 ? v8::Handle<v8::Value>(v8::False()) | |
130 : v8::Handle<v8::Value>(v8String(str)); | |
131 } | |
132 | |
133 } // namespace WebCore | |
134 | |
135 #endif // V8_BINDING_H__ | |
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