解析器测试
函数ts_parse可以直接测试文本搜索解析器。
ts_parse(parser_name text, document text,
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:
openGauss=# SELECT * FROM ts_parse('default', '123 - a number');
tokid | token
-------+--------
22 | 123
12 |
12 | -
1 | a
12 |
1 | number
(6 rows)
函数ts_token_type返回指定解析器的token类型及其描述信息。
ts_token_type(parser_name text, OUT tokid integer,
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:
openGauss=# SELECT * FROM ts_token_type('default');
tokid | alias | description
-------+-----------------+------------------------------------------
1 | asciiword | Word, all ASCII
2 | word | Word, all letters
3 | numword | Word, letters and digits
4 | email | Email address
5 | url | URL
6 | host | Host
7 | sfloat | Scientific notation
8 | version | Version number
9 | hword_numpart | Hyphenated word part, letters and digits
10 | hword_part | Hyphenated word part, all letters
11 | hword_asciipart | Hyphenated word part, all ASCII
12 | blank | Space symbols
13 | tag | XML tag
14 | protocol | Protocol head
15 | numhword | Hyphenated word, letters and digits
16 | asciihword | Hyphenated word, all ASCII
17 | hword | Hyphenated word, all letters
18 | url_path | URL path
19 | file | File or path name
20 | float | Decimal notation
21 | int | Signed integer
22 | uint | Unsigned integer
23 | entity | XML entity
(23 rows)