question: private String extractContext ( String s , int position ) { StringBuilder sb = new StringBuilder ( ) ; int j = position - 1 ; char c = s . charAt ( j ) ; while ( j > 0 && c != ' ' && c != '_' ) { c = s . charAt ( -- j ) ; } String ps = j > 0 ? s . substring ( j + 1 , position ) : s . substring ( 0 , position ) ; ps = convert ( ps ) ; sb . append ( "ps:" ) ; sb . append ( ps ) ; sb . append ( " pw:" ) ; sb . append ( lexicon . hasWord ( ps ) ? 1 : 0 ) ; j = position + 1 ; c = s . charAt ( j ) ; while ( j < s . length ( ) && c != ' ' && c != '_' ) { c = s . charAt ( j ++ ) ; } String ns = j < s . length ( ) ? s . substring ( position + 1 , j - 1 ) : s . substring ( position + 1 ) ; ns = convert ( ns ) ; sb . append ( " ns:" ) ; sb . append ( ns ) ; sb . append ( " nw:" ) ; sb . append ( lexicon . hasWord ( ns ) ? 1 : 0 ) ; sb . append ( " ps+ns:" ) ; sb . append ( ps ) ; sb . append ( '+' ) ; sb . append ( ns ) ; return sb . toString ( ) ; }
target:  Extracts a context string for each whitespace position. 