解析器测试

函数ts_parse可以直接测试文本搜索解析器。

1. ts_parse(parser_name text, document text,
2. OUT tokid integer, OUT token text) returns setof record

ts_parse解析指定的document并返回一系列的记录,一条记录代表一个解析生成的token。每条记录包括标识token类型的tokid及token文本。例如:

1. openGauss=# SELECT * FROM ts_parse('default', '123 - a number');
2. tokid | token
3. -------+--------
4. 22 | 123
5. 12 |
6. 12 | -
7. 1 | a
8. 12 |
9. 1 | number
10. (6 rows)

函数ts_token_type返回指定解析器的token类型及其描述信息。

1. ts_token_type(parser_name text, OUT tokid integer,
2. OUT alias text, OUT description text) returns setof record

ts_token_type返回一个表,这个表描述了指定解析器可以识别的每种token类型。对于每个token类型,表中给出了整数类型的tokid–用于解析器标记对应的token类型;alias——命名分词器命令中的token类型及简单描述。比如:

1. openGauss=# SELECT * FROM ts_token_type('default');
2. tokid |      alias      |               description
3. -------+-----------------+------------------------------------------
4. 1 | asciiword       | Word, all ASCII
5. 2 | word            | Word, all letters
6. 3 | numword         | Word, letters and digits
7. 4 | email           | Email address
8. 5 | url             | URL
9. 6 | host            | Host
10. 7 | sfloat          | Scientific notation
11. 8 | version         | Version number
12. 9 | hword_numpart   | Hyphenated word part, letters and digits
13. 10 | hword_part      | Hyphenated word part, all letters
14. 11 | hword_asciipart | Hyphenated word part, all ASCII
15. 12 | blank           | Space symbols
16. 13 | tag             | XML tag
17. 14 | protocol        | Protocol head
18. 15 | numhword        | Hyphenated word, letters and digits
19. 16 | asciihword      | Hyphenated word, all ASCII
20. 17 | hword           | Hyphenated word, all letters
21. 18 | url_path        | URL path
22. 19 | file            | File or path name
23. 20 | float           | Decimal notation
24. 21 | int             | Signed integer
25. 22 | uint            | Unsigned integer
26. 23 | entity          | XML entity
27. (23 rows)