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1 // Copyright 2014 the V8 project 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 "use strict"; | |
6 | |
7 var callSiteCache = new $Map; | |
8 | |
9 function SameCallSiteElements(rawStrings, other) { | |
10 var length = rawStrings.length; | |
11 var other = other.raw; | |
12 | |
13 if (length !== other.length) return false; | |
14 | |
15 for (var i = 0; i < length; ++i) { | |
16 if (rawStrings[i] !== other[i]) return false; | |
17 } | |
18 | |
19 return true; | |
20 } | |
21 | |
22 | |
23 function GetCachedCallSite(siteObj, hash) { | |
24 var obj = %MapGet(callSiteCache, hash); | |
25 | |
26 if (IS_UNDEFINED(obj)) return; | |
27 | |
28 var length = obj.length; | |
29 for (var i = 0; i < length; ++i) { | |
30 if (SameCallSiteElements(siteObj, obj[i])) return obj[i]; | |
31 } | |
32 } | |
33 | |
34 | |
35 function SetCachedCallSite(siteObj, hash) { | |
36 var obj = %MapGet(callSiteCache, hash); | |
37 var array; | |
38 | |
39 if (IS_UNDEFINED(obj)) { | |
40 array = new InternalArray(1); | |
41 array[0] = siteObj; | |
42 %MapSet(callSiteCache, hash, array); | |
43 } else { | |
44 obj.push(siteObj); | |
45 } | |
46 | |
47 return siteObj; | |
48 } | |
49 | |
50 | |
51 function GetTemplateCallSite(siteObj, rawStrings, hash) { | |
52 var cached = GetCachedCallSite(rawStrings, hash); | |
53 | |
54 if (!IS_UNDEFINED(cached)) return cached; | |
55 | |
56 %AddNamedProperty(siteObj, "raw", %ObjectFreeze(rawStrings), | |
57 READ_ONLY | DONT_ENUM | DONT_DELETE); | |
58 | |
59 return SetCachedCallSite(%ObjectFreeze(siteObj), hash); | |
60 } | |
61 | |
62 | |
63 // ES6 Draft 10-14-2014, section 21.1.2.4 | |
64 function StringRaw(callSite) { | |
65 // TODO(caitp): Use rest parameters when implemented | |
66 var numberOfSubstitutions = %_ArgumentsLength(); | |
67 var cooked = ToObject(callSite); | |
68 var raw = ToObject(cooked.raw); | |
69 var literalSegments = ToLength(raw.length); | |
70 if (literalSegments <= 0) return ""; | |
71 | |
72 var result = ToString(raw[0]); | |
73 | |
74 for (var i = 1; i < literalSegments; ++i) { | |
75 if (i < numberOfSubstitutions) { | |
76 result += ToString(%_Arguments(i)); | |
77 } | |
78 result += ToString(raw[i]); | |
79 } | |
80 | |
81 return result; | |
82 } | |
83 | |
84 | |
85 function ExtendStringForTemplates() { | |
86 %CheckIsBootstrapping(); | |
87 | |
88 // Set up the non-enumerable functions on the String object. | |
89 InstallFunctions($String, DONT_ENUM, $Array( | |
90 "raw", StringRaw | |
91 )); | |
92 } | |
93 | |
94 ExtendStringForTemplates(); | |
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