components/autofill/core/common/autofill_util.cc

   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/metrics/field_trial.h"
  13 #include "base/strings/string_piece.h"
  14 #include "base/strings/string_split.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "components/autofill/core/common/autofill_switches.h"
  18
  19 namespace autofill {
  20
  21 namespace {
  22
  23 const char kSplitCharacters[] = " .,-_@";
  24
  25 template <typename Char>
  26 struct Compare : base::CaseInsensitiveCompareASCII<Char> {
  27   explicit Compare(bool case_sensitive) : case_sensitive_(case_sensitive) {}
  28   bool operator()(Char x, Char y) const {
  29     return case_sensitive_ ? (x == y)
  30                            : base::CaseInsensitiveCompareASCII<Char>::
  31                              operator()(x, y);
  32   }
  33
  34  private:
  35   bool case_sensitive_;
  36 };
  37
  38 }  // namespace
  39
  40 bool IsFeatureSubstringMatchEnabled() {
  41   return base::CommandLine::ForCurrentProcess()->HasSwitch(
  42       switches::kEnableSuggestionsWithSubstringMatch);
  43 }
  44
  45 bool IsKeyboardAccessoryEnabled() {
  46 #if defined(OS_ANDROID)
  47   return base::CommandLine::ForCurrentProcess()->HasSwitch(
  48              switches::kEnableAccessorySuggestionView) ||
  49          (base::FieldTrialList::FindFullName("AutofillKeyboardAccessory") ==
  50               "Enabled" &&
  51           !base::CommandLine::ForCurrentProcess()->HasSwitch(
  52               switches::kDisableAccessorySuggestionView));
  53 #else  // !defined(OS_ANDROID)
  54   return false;
  55 #endif
  56 }
  57
  58 bool FieldIsSuggestionSubstringStartingOnTokenBoundary(
  59     const base::string16& suggestion,
  60     const base::string16& field_contents,
  61     bool case_sensitive) {
  62   if (!IsFeatureSubstringMatchEnabled()) {
  63     return base::StartsWith(suggestion, field_contents,
  64                             case_sensitive
  65                                 ? base::CompareCase::SENSITIVE
  66                                 : base::CompareCase::INSENSITIVE_ASCII);
  67   }
  68
  69   return suggestion.length() >= field_contents.length() &&
  70          GetTextSelectionStart(suggestion, field_contents, case_sensitive) !=
  71              base::string16::npos;
  72 }
  73
  74 size_t GetTextSelectionStart(const base::string16& suggestion,
  75                              const base::string16& field_contents,
  76                              bool case_sensitive) {
  77   const base::string16 kSplitChars = base::ASCIIToUTF16(kSplitCharacters);
  78
  79   // Loop until we find either the |field_contents| is a prefix of |suggestion|
  80   // or character right before the match is one of the splitting characters.
  81   for (base::string16::const_iterator it = suggestion.begin();
  82        (it = std::search(
  83             it, suggestion.end(), field_contents.begin(), field_contents.end(),
  84             Compare<base::string16::value_type>(case_sensitive))) !=
  85            suggestion.end();
  86        ++it) {
  87     if (it == suggestion.begin() ||
  88         kSplitChars.find(*(it - 1)) != std::string::npos) {
  89       // Returns the character position right after the |field_contents| within
  90       // |suggestion| text as a caret position for text selection.
  91       return it - suggestion.begin() + field_contents.size();
  92     }
  93   }
  94
  95   // Unable to find the |field_contents| in |suggestion| text.
  96   return base::string16::npos;
  97 }
  98
  99 }  // namespace autofill