[IE] First round of ATL removal

src/plugin/PluginUtil.cpp

 #include "PluginStdAfx.h"
 #include <algorithm>
 #include <stdexcept>
 #include <vector>
+#include <cctype>
 
 #include "../shared/Utils.h"
 #include "PluginUtil.h"
 #include "PluginSettings.h"
 
-BString::BString(const std::wstring& value)
-    : value(::SysAllocString(value.c_str()))
-{
-}
-
-BString::~BString()
-{
-  ::SysFreeString(value);
-}
-
-BString::operator BSTR()
-{
-  return value;
-}
-
 std::wstring HtmlFolderPath()
 {
   return GetDllDir() + L"html\\templates\\";
 }
 
 std::wstring UserSettingsFileUrl()
 {
   return FileUrl(HtmlFolderPath() + L"index.html");
 }
 
 std::wstring FirstRunPageFileUrl()
 {
   return FileUrl(HtmlFolderPath() + L"firstRun.html");
 }
 
 std::wstring FileUrl(const std::wstring& path)
 {
   std::wstring url = path;
   std::replace(url.begin(), url.end(), L'\\', L'/');
   return L"file:///" + url;
 }
+
+/**
+  * Case-insensitive wide-string equality
+  *
+  * We only use any kind of case-insensitive comparison in 'InjectABP'.
+  */
+bool ABP::util::wstring_equal_ci( std::wstring & a, std::wstring & b )
+{

[Oleksandr, 2014/06/26 00:48:43]

Since these functions are generic enough, I think it would be appropriate to
move them to Utils.cpp instead.

[Eric, 2014/06/26 15:13:56]

I'm OK with that.

I'd prefer to do it in a separate step; dealing with this large patch set is
already problematic.

+  /*
+   * We don't need ordering, so first just compare lengths.
+   */
+  size_t n = a.length();
+  if ( n != b.length() )
+  {
+    return false;
+  }
+  // Assert 'a' and 'b' have the same length
+  for ( size_t j = 0 ; j < n ; ++ j )
+  {
+    if ( std::tolower( a[j] ) != std::tolower( b[j] ) )

[sergei, 2014/07/08 11:58:34]

Strictly speaking it's not a correct implementation. I would prefer to use
Windows API here for string comparison.

[Eric, 2014/07/08 17:46:37]

That's right, it's not correct for every purpose. The only way it's used,
however, is to compare file names in exactly one place. Amusingly, it's mostly
irrelevant there, because IE 11 seems to converting a "file://" URL to a Windows
path name, so the comparison is failing anyway and needs to be rewritten.

+    {
+      return false;
+    }
+  }
+  return true;
+}
+
+void ABP::util::trim( std::wstring & s )
+{

[Oleksandr, 2014/06/26 00:48:43]

We already gave AdblockPlus::Utils::TrimString

[Eric, 2014/06/26 15:13:56]

I noticed that after I posted the review.

+  static wchar_t whitespace[] = L" \r\n\t";
+  size_t len = s.length();
+  if ( len == 0 )
+  {
+    return;
+  }
+  size_t n = s.find_first_not_of( whitespace, 0, 4 );
+  // Assert substring s[0,n) is all whitespace
+  // If n==0, the interval is empty.
+  // If n==wstring::npos, the whole string matched
+  if ( n == std::wstring::npos )
+  {
+    s.clear();
+    return;
+  }
+  else if ( n > 0 )
+  {
+    s.erase( 0, n );
+    len -= n;
+    if ( len == 0 )
+    {
+      return;
+    }
+  }
+  // Assert 's' is not empty
+  // Assert the first character of 's' is not whitespace
+  // Assert len == s.length()
+  n = s.find_last_not_of( whitespace, len, 4 ) + 1;
+  if ( n < len )
+  {
+    s.erase( n );
+  }
+}
+
+void ABP::util::trim_leading( std::wstring & s )
+{
+  static wchar_t whitespace[] = L" \r\n\t";
+  if ( s.length() == 0 )
+  {
+    return;
+  }
+  size_t n = s.find_first_not_of( whitespace, 0, 4 );
+  // Assert substring s[0,n) is all whitespace
+  // If n==0, the interval is empty, that is, no leading whitespace
+  // If n==wstring::npos, the whole string matched, that is, it's all whitespace
+  if ( n == std::wstring::npos )
+  {
+    s.clear();
+  }
+  else if ( n > 0 )
+  {
+    s.erase( 0, n );
+  }
+}
+
+void ABP::util::trim_trailing( std::wstring & s )
+{
+  static wchar_t whitespace[] = L" \r\n\t";
+  size_t len = s.length();
+  if ( len == 0 )
+  {
+    return;
+  }
+  // Assert 's' is not empty
+  size_t n = s.find_last_not_of( whitespace, len, 4 ) + 1;
+  if ( n < len )
+  {
+    s.erase( n );
+  }
+}
+
+void ABP::util::to_lower( std::wstring & s )
+{
+  size_t n = s.length();
+  for ( size_t j = 0 ; j < n ; ++j )
+  {
+    s[ j ] = tolower( s[ j ] );
+  }
+}
+
+std::wstring ABP::util::extract_token( const std::wstring source, size_t & start, const std::wstring tokens )
+{
+  // Skip initial tokens
+  size_t begin = source.find_first_not_of( tokens, start );
+  if ( begin == std::wstring::npos )
+  {
+    // Assert the source is all whitespace following the start position.
+    start = begin;
+    return std::wstring();
+  }
+  // Assert n < source.length
+  // Assert source[ start, n ) is all whitespace ( an empty interval if start == n )
+  // Assert source[ n ] is not whitespace
+  size_t end = source.find_first_of( tokens, begin + 1 );
+  if ( end == std::wstring::npos )
+  {
+    start = std::wstring::npos;
+    return source.substr( begin );
+  } 
+  if ( end + 1 >= source.length() ) {
+    start = std::wstring::npos;
+  } else {
+    start = end + 1;
+  }
+  return source.substr( begin, end - begin );
+}