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><A
NAME="TEST-PARSER"
>F.37. test_parser</A
></H1
><P
> <TT
CLASS="FILENAME"
>test_parser</TT
> is an example of a custom parser for full-text
search. It doesn't do anything especially useful, but can serve as
a starting point for developing your own parser.
</P
><P
> <TT
CLASS="FILENAME"
>test_parser</TT
> recognizes words separated by white space,
and returns just two token types:
</P><PRE
CLASS="PROGRAMLISTING"
>mydb=# SELECT * FROM ts_token_type('testparser');
tokid | alias | description
-------+-------+---------------
3 | word | Word
12 | blank | Space symbols
(2 rows)</PRE
><P>
These token numbers have been chosen to be compatible with the default
parser's numbering. This allows us to use its <CODE
CLASS="FUNCTION"
>headline()</CODE
>
function, thus keeping the example simple.
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>F.37.1. Usage</A
></H2
><P
> Installing the <TT
CLASS="LITERAL"
>test_parser</TT
> extension creates a text search
parser <TT
CLASS="LITERAL"
>testparser</TT
>. It has no user-configurable parameters.
</P
><P
> You can test the parser with, for example,
</P><PRE
CLASS="PROGRAMLISTING"
>mydb=# SELECT * FROM ts_parse('testparser', 'That''s my first own parser');
tokid | token
-------+--------
3 | That's
12 |
3 | my
12 |
3 | first
12 |
3 | own
12 |
3 | parser</PRE
><P>
</P
><P
> Real-world use requires setting up a text search configuration
that uses the parser. For example,
</P><PRE
CLASS="PROGRAMLISTING"
>mydb=# CREATE TEXT SEARCH CONFIGURATION testcfg ( PARSER = testparser );
CREATE TEXT SEARCH CONFIGURATION
mydb=# ALTER TEXT SEARCH CONFIGURATION testcfg
mydb-# ADD MAPPING FOR word WITH english_stem;
ALTER TEXT SEARCH CONFIGURATION
mydb=# SELECT to_tsvector('testcfg', 'That''s my first own parser');
to_tsvector
-------------------------------
'that':1 'first':3 'parser':5
(1 row)
mydb=# SELECT ts_headline('testcfg', 'Supernovae stars are the brightest phenomena in galaxies',
mydb(# to_tsquery('testcfg', 'star'));
ts_headline
-----------------------------------------------------------------
Supernovae <b>stars</b> are the brightest phenomena in galaxies
(1 row)</PRE
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