For "foo" vs "Foo", the all-lowercase one wins

cpp/Candidate.cpp

@@ -18,6 +18,10 @@
 #include "standard.h"
 #include "Candidate.h"
 #include <cctype>
+#include <boost/algorithm/string.hpp>
+
+using boost::algorithm::all;
+using boost::algorithm::is_lower;
 
 namespace YouCompleteMe
 {
@@ -57,15 +61,18 @@ Bitset LetterBitsetFromString( const std::string &text )
   return letter_bitset;
 }
 
+
 Candidate::Candidate( const std::string &text )
   :
   text_( text ),
   word_boundary_chars_( GetWordBoundaryChars( text ) ),
+  text_is_lowercase_( all( text, is_lower() ) ),
   letters_present_( LetterBitsetFromString( text ) ),
   root_node_( new LetterNode( text ) )
 {
 }
 
+
 Result Candidate::QueryMatchResult( const std::string &query ) const
 {
   LetterNode *node = root_node_.get();
@@ -80,7 +87,8 @@ Result Candidate::QueryMatchResult( const std::string &query ) const
     node = list->front();
   }
 
-  return Result( true, &text_, word_boundary_chars_, query );
+  return Result( true, &text_, text_is_lowercase_, word_boundary_chars_,
+                 query );
 }
 
 } // namespace YouCompleteMe

cpp/Candidate.h

@@ -59,6 +59,7 @@ private:
 
   std::string text_;
   std::string word_boundary_chars_;
+  bool text_is_lowercase_;
   Bitset letters_present_;
   boost::scoped_ptr< LetterNode > root_node_;
 };

cpp/Result.cpp

@@ -52,12 +52,14 @@ Result::Result( bool is_subsequence )
   ratio_of_word_boundary_chars_in_query_( 0 ),
   word_boundary_char_utilization_( 0 ),
   query_is_candidate_prefix_( false ),
+  text_is_lowercase_( false ),
   text_( NULL )
 {
 }
 
 Result::Result( bool is_subsequence,
                 const std::string *text,
+                bool text_is_lowercase,
                 const std::string &word_boundary_chars,
                 const std::string &query )
   :
@@ -66,10 +68,11 @@ Result::Result( bool is_subsequence,
   ratio_of_word_boundary_chars_in_query_( 0 ),
   word_boundary_char_utilization_( 0 ),
   query_is_candidate_prefix_( false ),
+  text_is_lowercase_( text_is_lowercase ),
   text_( text )
 {
   if ( is_subsequence )
-    SetResultFeaturesFromQuery( query, word_boundary_chars );
+    SetResultFeaturesFromQuery( word_boundary_chars, query );
 }
 
 
@@ -82,6 +85,7 @@ Result::Result( const Result& other )
       other.ratio_of_word_boundary_chars_in_query_ ),
   word_boundary_char_utilization_( other.word_boundary_char_utilization_ ),
   query_is_candidate_prefix_( other.query_is_candidate_prefix_ ),
+  text_is_lowercase_( other.text_is_lowercase_ ),
   text_( other.text_ )
 {
 }
@@ -124,9 +128,7 @@ bool Result::operator< ( const Result &other ) const {
   }
 
   if ( query_is_candidate_prefix_ != other.query_is_candidate_prefix_ )
-  {
     return query_is_candidate_prefix_;
-  }
 
   if ( !equal_wb_ratios )
   {
@@ -142,17 +144,18 @@ bool Result::operator< ( const Result &other ) const {
   }
 
   if ( text_->length() != other.text_->length() )
-  {
     return text_->length() < other.text_->length();
-  }
+
+  if ( text_is_lowercase_ != other.text_is_lowercase_ )
+    return text_is_lowercase_;
 
   return *text_ < *other.text_;
 }
 
 
 void Result::SetResultFeaturesFromQuery(
-    const std::string &query,
-    const std::string &word_boundary_chars )
+    const std::string &word_boundary_chars,
+    const std::string &query)
 {
   if ( query.empty() || text_->empty() )
     return;

cpp/Result.h

@@ -30,6 +30,7 @@ public:
 
   Result( bool is_subsequence,
           const std::string *text,
+          bool text_is_lowercase,
           const std::string &word_boundary_chars,
           const std::string &query );
 
@@ -62,6 +63,7 @@ private:
   // number of word boundary matches / number of all word boundary chars
   double word_boundary_char_utilization_;
   bool query_is_candidate_prefix_;
+  bool text_is_lowercase_;
   const std::string *text_;
 
 };

cpp/tests/Completer_test.cpp

@@ -197,5 +197,17 @@ TEST_F( CompleterTest, ShorterCandidateWins )
 	                          "CompleterTest" ) );
 }
 
+TEST_F( CompleterTest, SameLowercaseCandidateWins )
+{
+	Pylist results;
+	Completer( Candidates(
+	        "foobar",
+	        "Foobar" ) ).GetCandidatesForQuery( "foo", results );
+
+	EXPECT_THAT( ToStringVector( results ),
+	             ElementsAre( "foobar",
+	                          "Foobar" ) );
+}
+
 } // namespace YouCompleteMe