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>Appendix F. Additional Supplied Modules</TD
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CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="UNACCENT"
>F.37. unaccent</A
></H1
><P
> <TT
CLASS="FILENAME"
>unaccent</TT
> removes accents (diacritic signs) from a lexeme.
It's a filtering dictionary, that means its output is
always passed to the next dictionary (if any), contrary to the standard
behaviour. Currently, it supports most important accents from european
languages.
</P
><P
> Limitation: Current implementation of <TT
CLASS="FILENAME"
>unaccent</TT
>
dictionary cannot be used as a normalizing dictionary for
<TT
CLASS="FILENAME"
>thesaurus</TT
> dictionary.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118937"
>F.37.1. Configuration</A
></H2
><P
> A <TT
CLASS="LITERAL"
>unaccent</TT
> dictionary accepts the following options:
</P
><P
></P
><UL
><LI
><P
> <TT
CLASS="LITERAL"
>RULES</TT
> is the base name of the file containing the list of
translation rules. This file must be stored in
<TT
CLASS="FILENAME"
>$SHAREDIR/tsearch_data/</TT
> (where <TT
CLASS="LITERAL"
>$SHAREDIR</TT
> means
the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> installation's shared-data directory).
Its name must end in <TT
CLASS="LITERAL"
>.rules</TT
> (which is not to be included in
the <TT
CLASS="LITERAL"
>RULES</TT
> parameter).
</P
></LI
></UL
><P
> The rules file has the following format:
</P
><P
></P
><UL
><LI
><P
> Each line represents pair: character_with_accent character_without_accent
</P><PRE
CLASS="PROGRAMLISTING"
>À A
Á A
 A
à A
Ä A
Å A
Æ A
</PRE
><P>
</P
></LI
></UL
><P
> Look at <TT
CLASS="FILENAME"
>unaccent.rules</TT
>, which is installed in
<TT
CLASS="FILENAME"
>$SHAREDIR/tsearch_data/</TT
>, for an example.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118958"
>F.37.2. Usage</A
></H2
><P
> Running the installation script creates a text search template
<TT
CLASS="LITERAL"
>unaccent</TT
> and a dictionary <TT
CLASS="LITERAL"
>unaccent</TT
>
based on it, with default parameters. You can alter the
parameters, for example
</P><PRE
CLASS="PROGRAMLISTING"
>=# ALTER TEXT SEARCH DICTIONARY unaccent (RULES='my_rules');</PRE
><P>
or create new dictionaries based on the template.
</P
><P
> To test the dictionary, you can try
</P><PRE
CLASS="PROGRAMLISTING"
>=# select ts_lexize('unaccent','Hôtel');
ts_lexize
-----------
{Hotel}
(1 row)</PRE
><P>
</P
><P
> Filtering dictionary are useful for correct work of
<CODE
CLASS="FUNCTION"
>ts_headline</CODE
> function.
</P><PRE
CLASS="PROGRAMLISTING"
>=# CREATE TEXT SEARCH CONFIGURATION fr ( COPY = french );
=# ALTER TEXT SEARCH CONFIGURATION fr
ALTER MAPPING FOR hword, hword_part, word
WITH unaccent, french_stem;
=# select to_tsvector('fr','Hôtels de la Mer');
to_tsvector
-------------------
'hotel':1 'mer':4
(1 row)
=# select to_tsvector('fr','Hôtel de la Mer') @@ to_tsquery('fr','Hotels');
?column?
----------
t
(1 row)
=# select ts_headline('fr','Hôtel de la Mer',to_tsquery('fr','Hotels'));
ts_headline
------------------------
<b>Hôtel</b>de la Mer
(1 row) </PRE
><P>
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118969"
>F.37.3. Function</A
></H2
><P
> <CODE
CLASS="FUNCTION"
>unaccent</CODE
> function removes accents (diacritic signs) from
argument string. Basically, it's a wrapper around
<TT
CLASS="FILENAME"
>unaccent</TT
> dictionary.
</P
><PRE
CLASS="SYNOPSIS"
> unaccent([<SPAN
CLASS="OPTIONAL"
><TT
CLASS="REPLACEABLE"
><I
>dictionary</I
></TT
>,
</SPAN
>] <TT
CLASS="REPLACEABLE"
><I
>string</I
></TT
>)
returns <TT
CLASS="TYPE"
>text</TT
>
</PRE
><P
></P><PRE
CLASS="PROGRAMLISTING"
>SELECT unaccent('unaccent','Hôtel');
SELECT unaccent('Hôtel');</PRE
><P>
</P
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