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Soundex.cpp
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Soundex.cpp
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#include "Soundex.h"
#include <map>
#include <stdio.h>
//#include <boost\assign.hpp>
const size_t maxCodeLength = 4 ;
char notDigit = '*';
std::string Soundex::padWithZero(const std::string& word ) const
{
size_t zerosNeeded = maxCodeLength - word.length();
return word + std::string(zerosNeeded, '0');
}
bool Soundex::isComplete( const std::string& encoding ) const
{
return encoding.length() == maxCodeLength - 1;
}
std::string Soundex::encode(const std::string& word) const
{
char front = upper( head ( word ) );
std::string rest = encodeDigits( word );
return padWithZero(front + rest);
}
char Soundex::encodeDigit( const char letter ) const
{
std::map< char, char > encodings;
// = boost::assign::map_list_of(1 , new MyObject(1))(2, new MyObject(2))(3, new MyObject(3));s
encodings.insert( std::make_pair( 'b', '1' ) );
encodings.insert( std::make_pair( 'c', '2' ) );
encodings.insert( std::make_pair( 'f', '1' ) );
encodings.insert( std::make_pair( 'p', '1' ) );
encodings.insert( std::make_pair( 'v', '1' ) );
encodings.insert( std::make_pair( 'g', '2' ) );
encodings.insert( std::make_pair( 'j', '2' ) );
encodings.insert( std::make_pair( 'k', '2' ) );
encodings.insert( std::make_pair( 'q', '2' ) );
encodings.insert( std::make_pair( 's', '2' ) );
encodings.insert( std::make_pair( 'x', '2' ) );
encodings.insert( std::make_pair( 'z', '2' ) );
encodings.insert( std::make_pair( 'd', '3' ) );
encodings.insert( std::make_pair( 't', '3' ) );
encodings.insert( std::make_pair( 'l', '4' ) );
encodings.insert( std::make_pair( 'm', '5' ) );
encodings.insert( std::make_pair( 'n', '5' ) );
encodings.insert( std::make_pair( 'r', '6' ) );
const char loweredLetter = lower( letter );
std::map< char, char >::iterator it = encodings.find( loweredLetter );
if( it == encodings.end() )
return notDigit;
char c = (it)->second;
return c;
}
std::string Soundex::encodeHead( const std::string& word ) const
{
const char front = lower( word[ 0 ] );
std::string rest = tail( word );
if ( front == rest[ 0 ] )
rest = tail( rest );
return rest;
}
std::string Soundex::encodeTail( const std::string& word ) const
{
std::string encoding = "";
for ( size_t i = 0 ; i < word.size() ; i++ )
{
if ( isComplete( encoding ) )
break;
encodeLetter( encoding, word[ i ], word[ i - 1]);
}
return encoding;
}
void Soundex::encodeLetter(std::string& encoding,
const char letter, const char lastLetter) const
{
const char digit = encodeDigit( letter );
const char last = lastDigit( encoding );
if ( digit != notDigit &&
( last != digit || isVowel( lastLetter ) )
)
encoding += digit;
}
bool Soundex::isVowel( const char letter ) const
{
return std::string("aeiouy").find(lower(letter)) != std::string::npos;
}
std::string Soundex::encodeDigits( const std::string& word ) const
{
return encodeTail( encodeHead( word ) );
}
char Soundex::lastDigit( const std::string& encoding ) const
{
if ( encoding.empty() )
return notDigit;
return encoding[ encoding.size() -1 ];
}
char Soundex::head( const std::string& word ) const
{
return word[ 0 ];
}
std::string Soundex::tail( const std::string& word ) const
{
return word.substr( 1 );
}
char Soundex::lower( const char c ) const {
return std::tolower( static_cast< unsigned char >( c ) );
}
char Soundex::upper( const char c ) const {
return std::toupper( static_cast< unsigned char >( c ) ) ;
}