def encode(self, word, max_length=-1):
        """Return the Metaphone code for a word.

        Based on Lawrence Philips' Pick BASIC code from 1990
        :cite:`Philips:1990`, as described in :cite:`Philips:1990b`.
        This incorporates some corrections to the above code, particularly
        some of those suggested by Michael Kuhn in :cite:`Kuhn:1995`.

        Parameters
        ----------
        word : str
            The word to transform
        max_length : int
            The maximum length of the returned Metaphone code (defaults to 64,
            but in Philips' original implementation this was 4)

        Returns
        -------
        str
            The Metaphone value

        Examples
        --------
        >>> pe = Metaphone()
        >>> pe.encode('Christopher')
        'KRSTFR'
        >>> pe.encode('Niall')
        'NL'
        >>> pe.encode('Smith')
        'SM0'
        >>> pe.encode('Schmidt')
        'SKMTT'

        """
        # Require a max_length of at least 4
        if max_length != -1:
            max_length = max(4, max_length)
        else:
            max_length = 64

        # As in variable sound--those modified by adding an "h"
        ename = ''.join(c for c in word.upper() if c.isalnum())
        ename = ename.replace('ß', 'SS')

        # Delete non-alphanumeric characters and make all caps
        if not ename:
            return ''
        if ename[0:2] in {'PN', 'AE', 'KN', 'GN', 'WR'}:
            ename = ename[1:]
        elif ename[0] == 'X':
            ename = 'S' + ename[1:]
        elif ename[0:2] == 'WH':
            ename = 'W' + ename[2:]

        # Convert to metaphone
        elen = len(ename) - 1
        metaph = ''
        for i in range(len(ename)):
            if len(metaph) >= max_length:
                break
            if (
                ename[i] not in {'G', 'T'}
                and i > 0
                and ename[i - 1] == ename[i]
            ):
                continue

            if ename[i] in self._uc_v_set and i == 0:
                metaph = ename[i]

            elif ename[i] == 'B':
                if i != elen or ename[i - 1] != 'M':
                    metaph += ename[i]

            elif ename[i] == 'C':
                if not (
                    i > 0
                    and ename[i - 1] == 'S'
                    and ename[i + 1 : i + 2] in self._frontv
                ):
                    if ename[i + 1 : i + 3] == 'IA':
                        metaph += 'X'
                    elif ename[i + 1 : i + 2] in self._frontv:
                        metaph += 'S'
                    elif i > 0 and ename[i - 1 : i + 2] == 'SCH':
                        metaph += 'K'
                    elif ename[i + 1 : i + 2] == 'H':
                        if (
                            i == 0
                            and i + 1 < elen
                            and ename[i + 2 : i + 3] not in self._uc_v_set
                        ):
                            metaph += 'K'
                        else:
                            metaph += 'X'
                    else:
                        metaph += 'K'

            elif ename[i] == 'D':
                if (
                    ename[i + 1 : i + 2] == 'G'
                    and ename[i + 2 : i + 3] in self._frontv
                ):
                    metaph += 'J'
                else:
                    metaph += 'T'

            elif ename[i] == 'G':
                if ename[i + 1 : i + 2] == 'H' and not (
                    i + 1 == elen or ename[i + 2 : i + 3] not in self._uc_v_set
                ):
                    continue
                elif i > 0 and (
                    (i + 1 == elen and ename[i + 1] == 'N')
                    or (i + 3 == elen and ename[i + 1 : i + 4] == 'NED')
                ):
                    continue
                elif (
                    i - 1 > 0
                    and i + 1 <= elen
                    and ename[i - 1] == 'D'
                    and ename[i + 1] in self._frontv
                ):
                    continue
                elif ename[i + 1 : i + 2] == 'G':
                    continue
                elif ename[i + 1 : i + 2] in self._frontv:
                    if i == 0 or ename[i - 1] != 'G':
                        metaph += 'J'
                    else:
                        metaph += 'K'
                else:
                    metaph += 'K'

            elif ename[i] == 'H':
                if (
                    i > 0
                    and ename[i - 1] in self._uc_v_set
                    and ename[i + 1 : i + 2] not in self._uc_v_set
                ):
                    continue
                elif i > 0 and ename[i - 1] in self._varson:
                    continue
                else:
                    metaph += 'H'

            elif ename[i] in {'F', 'J', 'L', 'M', 'N', 'R'}:
                metaph += ename[i]

            elif ename[i] == 'K':
                if i > 0 and ename[i - 1] == 'C':
                    continue
                else:
                    metaph += 'K'

            elif ename[i] == 'P':
                if ename[i + 1 : i + 2] == 'H':
                    metaph += 'F'
                else:
                    metaph += 'P'

            elif ename[i] == 'Q':
                metaph += 'K'

            elif ename[i] == 'S':
                if (
                    i > 0
                    and i + 2 <= elen
                    and ename[i + 1] == 'I'
                    and ename[i + 2] in 'OA'
                ):
                    metaph += 'X'
                elif ename[i + 1 : i + 2] == 'H':
                    metaph += 'X'
                else:
                    metaph += 'S'

            elif ename[i] == 'T':
                if (
                    i > 0
                    and i + 2 <= elen
                    and ename[i + 1] == 'I'
                    and ename[i + 2] in {'A', 'O'}
                ):
                    metaph += 'X'
                elif ename[i + 1 : i + 2] == 'H':
                    metaph += '0'
                elif ename[i + 1 : i + 3] != 'CH':
                    if ename[i - 1 : i] != 'T':
                        metaph += 'T'

            elif ename[i] == 'V':
                metaph += 'F'

            elif ename[i] in 'WY':
                if ename[i + 1 : i + 2] in self._uc_v_set:
                    metaph += ename[i]

            elif ename[i] == 'X':
                metaph += 'KS'

            elif ename[i] == 'Z':
                metaph += 'S'

        return metaph
def encode(self, word, max_length=-1):
        """Return the Metaphone code for a word.

        Based on Lawrence Philips' Pick BASIC code from 1990
        :cite:`Philips:1990`, as described in :cite:`Philips:1990b`.
        This incorporates some corrections to the above code, particularly
        some of those suggested by Michael Kuhn in :cite:`Kuhn:1995`.

        Parameters
        ----------
        word : str
            The word to transform
        max_length : int
            The maximum length of the returned Metaphone code (defaults to 64,
            but in Philips' original implementation this was 4)

        Returns
        -------
        str
            The Metaphone value

        Examples
        --------
        >>> pe = Metaphone()
        >>> pe.encode('Christopher')
        'KRSTFR'
        >>> pe.encode('Niall')
        'NL'
        >>> pe.encode('Smith')
        'SM0'
        >>> pe.encode('Schmidt')
        'SKMTT'

        """
        # Require a max_length of at least 4
        if max_length != -1:
            max_length = max(4, max_length)
        else:
            max_length = 64

        # As in variable sound--those modified by adding an "h"
        ename = ''.join(c for c in word.upper() if c.isalnum())
        ename = ename.replace('ß', 'SS')

        # Delete non-alphanumeric characters and make all caps
        if not ename:
            return ''
        if ename[0:2] in {'PN', 'AE', 'KN', 'GN', 'WR'}:
            ename = ename[1:]
        elif ename[0] == 'X':
            ename = 'S' + ename[1:]
        elif ename[0:2] == 'WH':
            ename = 'W' + ename[2:]

        # Convert to metaphone
        elen = len(ename) - 1
        metaph = ''
        for i in range(len(ename)):
            if len(metaph) >= max_length:
                break
            if (
                ename[i] not in {'G', 'T'}
                and i > 0
                and ename[i - 1] == ename[i]
            ):
                continue

            if ename[i] in self._uc_v_set and i == 0:
                metaph = ename[i]

            elif ename[i] == 'B':
                if i != elen or ename[i - 1] != 'M':
                    metaph += ename[i]

            elif ename[i] == 'C':
                if not (
                    i > 0
                    and ename[i - 1] == 'S'
                    and ename[i + 1 : i + 2] in self._frontv
                ):
                    if ename[i + 1 : i + 3] == 'IA':
                        metaph += 'X'
                    elif ename[i + 1 : i + 2] in self._frontv:
                        metaph += 'S'
                    elif i > 0 and ename[i - 1 : i + 2] == 'SCH':
                        metaph += 'K'
                    elif ename[i + 1 : i + 2] == 'H':
                        if (
                            i == 0
                            and i + 1 < elen
                            and ename[i + 2 : i + 3] not in self._uc_v_set
                        ):
                            metaph += 'K'
                        else:
                            metaph += 'X'
                    else:
                        metaph += 'K'

            elif ename[i] == 'D':
                if (
                    ename[i + 1 : i + 2] == 'G'
                    and ename[i + 2 : i + 3] in self._frontv
                ):
                    metaph += 'J'
                else:
                    metaph += 'T'

            elif ename[i] == 'G':
                if ename[i + 1 : i + 2] == 'H' and not (
                    i + 1 == elen or ename[i + 2 : i + 3] not in self._uc_v_set
                ):
                    continue
                elif i > 0 and (
                    (i + 1 == elen and ename[i + 1] == 'N')
                    or (i + 3 == elen and ename[i + 1 : i + 4] == 'NED')
                ):
                    continue
                elif (
                    i - 1 > 0
                    and i + 1 <= elen
                    and ename[i - 1] == 'D'
                    and ename[i + 1] in self._frontv
                ):
                    continue
                elif ename[i + 1 : i + 2] == 'G':
                    continue
                elif ename[i + 1 : i + 2] in self._frontv:
                    if i == 0 or ename[i - 1] != 'G':
                        metaph += 'J'
                    else:
                        metaph += 'K'
                else:
                    metaph += 'K'

            elif ename[i] == 'H':
                if (
                    i > 0
                    and ename[i - 1] in self._uc_v_set
                    and ename[i + 1 : i + 2] not in self._uc_v_set
                ):
                    continue
                elif i > 0 and ename[i - 1] in self._varson:
                    continue
                else:
                    metaph += 'H'

            elif ename[i] in {'F', 'J', 'L', 'M', 'N', 'R'}:
                metaph += ename[i]

            elif ename[i] == 'K':
                if i > 0 and ename[i - 1] == 'C':
                    continue
                else:
                    metaph += 'K'

            elif ename[i] == 'P':
                if ename[i + 1 : i + 2] == 'H':
                    metaph += 'F'
                else:
                    metaph += 'P'

            elif ename[i] == 'Q':
                metaph += 'K'

            elif ename[i] == 'S':
                if (
                    i > 0
                    and i + 2 <= elen
                    and ename[i + 1] == 'I'
                    and ename[i + 2] in 'OA'
                ):
                    metaph += 'X'
                elif ename[i + 1 : i + 2] == 'H':
                    metaph += 'X'
                else:
                    metaph += 'S'

            elif ename[i] == 'T':
                if (
                    i > 0
                    and i + 2 <= elen
                    and ename[i + 1] == 'I'
                    and ename[i + 2] in {'A', 'O'}
                ):
                    metaph += 'X'
                elif ename[i + 1 : i + 2] == 'H':
                    metaph += '0'
                elif ename[i + 1 : i + 3] != 'CH':
                    if ename[i - 1 : i] != 'T':
                        metaph += 'T'

            elif ename[i] == 'V':
                metaph += 'F'

            elif ename[i] in 'WY':
                if ename[i + 1 : i + 2] in self._uc_v_set:
                    metaph += ename[i]

            elif ename[i] == 'X':
                metaph += 'KS'

            elif ename[i] == 'Z':
                metaph += 'S'

        return metaph
def encode ( self , word , max_length = - 1 ) : # Require a max_length of at least 4 if max_length != - 1 : max_length = max ( 4 , max_length ) else : max_length = 64 # As in variable sound--those modified by adding an "h" ename = '' . join ( c for c in word . upper ( ) if c . isalnum ( ) ) ename = ename . replace ( 'ß', SS') # Delete non-alphanumeric characters and make all caps if not ename : return '' if ename [ 0 : 2 ] in { 'PN' , 'AE' , 'KN' , 'GN' , 'WR' } : ename = ename [ 1 : ] elif ename [ 0 ] == 'X' : ename = 'S' + ename [ 1 : ] elif ename [ 0 : 2 ] == 'WH' : ename = 'W' + ename [ 2 : ] # Convert to metaphone elen = len ( ename ) - 1 metaph = '' for i in range ( len ( ename ) ) : if len ( metaph ) >= max_length : break if ( ename [ i ] not in { 'G' , 'T' } and i > 0 and ename [ i - 1 ] == ename [ i ] ) : continue if ename [ i ] in self . _uc_v_set and i == 0 : metaph = ename [ i ] elif ename [ i ] == 'B' : if i != elen or ename [ i - 1 ] != 'M' : metaph += ename [ i ] elif ename [ i ] == 'C' : if not ( i > 0 and ename [ i - 1 ] == 'S' and ename [ i + 1 : i + 2 ] in self . _frontv ) : if ename [ i + 1 : i + 3 ] == 'IA' : metaph += 'X' elif ename [ i + 1 : i + 2 ] in self . _frontv : metaph += 'S' elif i > 0 and ename [ i - 1 : i + 2 ] == 'SCH' : metaph += 'K' elif ename [ i + 1 : i + 2 ] == 'H' : if ( i == 0 and i + 1 < elen and ename [ i + 2 : i + 3 ] not in self . _uc_v_set ) : metaph += 'K' else : metaph += 'X' else : metaph += 'K' elif ename [ i ] == 'D' : if ( ename [ i + 1 : i + 2 ] == 'G' and ename [ i + 2 : i + 3 ] in self . _frontv ) : metaph += 'J' else : metaph += 'T' elif ename [ i ] == 'G' : if ename [ i + 1 : i + 2 ] == 'H' and not ( i + 1 == elen or ename [ i + 2 : i + 3 ] not in self . _uc_v_set ) : continue elif i > 0 and ( ( i + 1 == elen and ename [ i + 1 ] == 'N' ) or ( i + 3 == elen and ename [ i + 1 : i + 4 ] == 'NED' ) ) : continue elif ( i - 1 > 0 and i + 1 <= elen and ename [ i - 1 ] == 'D' and ename [ i + 1 ] in self . _frontv ) : continue elif ename [ i + 1 : i + 2 ] == 'G' : continue elif ename [ i + 1 : i + 2 ] in self . _frontv : if i == 0 or ename [ i - 1 ] != 'G' : metaph += 'J' else : metaph += 'K' else : metaph += 'K' elif ename [ i ] == 'H' : if ( i > 0 and ename [ i - 1 ] in self . _uc_v_set and ename [ i + 1 : i + 2 ] not in self . _uc_v_set ) : continue elif i > 0 and ename [ i - 1 ] in self . _varson : continue else : metaph += 'H' elif ename [ i ] in { 'F' , 'J' , 'L' , 'M' , 'N' , 'R' } : metaph += ename [ i ] elif ename [ i ] == 'K' : if i > 0 and ename [ i - 1 ] == 'C' : continue else : metaph += 'K' elif ename [ i ] == 'P' : if ename [ i + 1 : i + 2 ] == 'H' : metaph += 'F' else : metaph += 'P' elif ename [ i ] == 'Q' : metaph += 'K' elif ename [ i ] == 'S' : if ( i > 0 and i + 2 <= elen and ename [ i + 1 ] == 'I' and ename [ i + 2 ] in 'OA' ) : metaph += 'X' elif ename [ i + 1 : i + 2 ] == 'H' : metaph += 'X' else : metaph += 'S' elif ename [ i ] == 'T' : if ( i > 0 and i + 2 <= elen and ename [ i + 1 ] == 'I' and ename [ i + 2 ] in { 'A' , 'O' } ) : metaph += 'X' elif ename [ i + 1 : i + 2 ] == 'H' : metaph += '0' elif ename [ i + 1 : i + 3 ] != 'CH' : if ename [ i - 1 : i ] != 'T' : metaph += 'T' elif ename [ i ] == 'V' : metaph += 'F' elif ename [ i ] in 'WY' : if ename [ i + 1 : i + 2 ] in self . _uc_v_set : metaph += ename [ i ] elif ename [ i ] == 'X' : metaph += 'KS' elif ename [ i ] == 'Z' : metaph += 'S' return metaph
Return the Metaphone code for a word.

        Based on Lawrence Philips' Pick BASIC code from 1990
        :cite:`Philips:1990`, as described in :cite:`Philips:1990b`.
        This incorporates some corrections to the above code, particularly
        some of those suggested by Michael Kuhn in :cite:`Kuhn:1995`.

        Parameters
        ----------
        word : str
            The word to transform
        max_length : int
            The maximum length of the returned Metaphone code (defaults to 64,
            but in Philips' original implementation this was 4)

        Returns
        -------
        str
            The Metaphone value

        Examples
        --------
        >>> pe = Metaphone()
        >>> pe.encode('Christopher')
        'KRSTFR'
        >>> pe.encode('Niall')
        'NL'
        >>> pe.encode('Smith')
        'SM0'
        >>> pe.encode('Schmidt')
        'SKMTT'
Return the Metaphone code for a word .