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1 // Copyright 2015 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 #include "components/autofill/core/common/autofill_util.h" | |
6 | |
7 #include <algorithm> | |
8 #include <vector> | |
9 | |
10 #include "base/command_line.h" | |
11 #include "base/i18n/case_conversion.h" | |
12 #include "base/strings/string_piece.h" | |
13 #include "base/strings/string_split.h" | |
14 #include "base/strings/string_util.h" | |
15 #include "base/strings/utf_string_conversions.h" | |
16 #include "components/autofill/core/common/autofill_switches.h" | |
17 | |
18 namespace autofill { | |
19 | |
20 namespace { | |
21 | |
22 const char kSplitCharacters[] = " .,-_@"; | |
23 | |
24 template <typename Char> | |
25 struct Compare : base::CaseInsensitiveCompare<Char> { | |
26 explicit Compare(bool case_sensitive) : case_sensitive_(case_sensitive) {} | |
27 bool operator()(Char x, Char y) const { | |
28 return case_sensitive_ ? (x == y) : base::CaseInsensitiveCompare<Char>:: | |
29 operator()(x, y); | |
30 } | |
31 | |
32 private: | |
33 bool case_sensitive_; | |
34 }; | |
35 | |
36 } // namespace | |
37 | |
38 bool IsFeatureSubstringMatchEnabled() { | |
39 return base::CommandLine::ForCurrentProcess()->HasSwitch( | |
40 switches::kEnableSuggestionsWithSubstringMatch); | |
41 } | |
42 | |
43 bool FieldIsSuggestionSubstringStartingOnTokenBoundary( | |
44 const base::string16& suggestion, | |
45 const base::string16& field_contents, | |
46 bool case_sensitive) { | |
47 return IsFeatureSubstringMatchEnabled() && | |
48 suggestion.length() >= field_contents.length() && | |
49 GetTextSelectionStart(suggestion, field_contents, case_sensitive) != | |
50 base::string16::npos; | |
51 } | |
52 | |
53 size_t GetTextSelectionStart(const base::string16& suggestion, | |
54 const base::string16& field_contents, | |
55 bool case_sensitive) { | |
56 const base::string16 kSplitChars = base::ASCIIToUTF16(kSplitCharacters); | |
57 base::string16::const_iterator it = suggestion.begin(); | |
58 | |
59 // Loop until we find either the |field_contents| is a prefix of |suggestion| | |
60 // or character right before the match is one of the splitting characters. | |
61 do { | |
62 it = std::search(it, suggestion.end(), field_contents.begin(), | |
63 field_contents.end(), | |
64 Compare<base::string16::value_type>(case_sensitive)); | |
65 if (it == suggestion.end()) | |
66 break; | |
vabr (Chromium)
2015/07/13 14:04:26
nit: Why not just
return base::string16::npos;
Pritam Nikam
2015/07/14 10:30:07
Restored to for(...) instead.
| |
67 | |
68 if (it == suggestion.begin() || | |
69 kSplitChars.find(*(it - 1)) != std::string::npos) { | |
70 // Returns the character position right after the |field_contents| within | |
71 // |suggestion| text as a caret position for text selection. | |
72 return it - suggestion.begin() + field_contents.size(); | |
73 } | |
74 | |
75 ++it; | |
76 } while (it != suggestion.end()); | |
77 | |
78 // Unable to find the |field_contents| in |suggestion| text. | |
79 return base::string16::npos; | |
80 } | |
81 | |
82 } // namespace autofill | |
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