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Issue 1027593005: [es6] remove --harmony-templates flag (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Remove extra references to harmony-templates stuff Created 5 years, 9 months ago
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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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