Jack Conradson created LUCENE-5336:
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Summary: Add a simple QueryParser to parse human-entered queries.
Key: LUCENE-5336
URL: https://issues.apache.org/jira/browse/LUCENE-5336
Project: Lucene - Core
Issue Type: Improvement
Reporter: Jack Conradson
I would like to add a new simple QueryParser to Lucene that is designed to
parse human-entered queries. This parser will operate on an entire entered
query using a specified single field or a set of weighted fields (using term
boost).
All features/operations in this parser can be enabled or disabled depending on
what is necessary for the user. A default operator may be specified as either
'MUST' representing 'and' or 'SHOULD' representing 'or.' The
features/operations that this parser will include are the following:
* AND specified as '+'
* OR specified as '|'
* NOT specified as '-'
* PHRASE surrounded by double quotes
* PREFIX specified as '*'
* PRECEDENCE surrounded by '(' and ')'
* WHITESPACE specified as ' ' '\n' '\r' and '\t' will cause the default
operator to be used
* ESCAPE specified as '\' will allow operators to be used in terms
The key differences between this parser and other existing parsers will be the
following:
* No exceptions will be thrown, and errors in syntax will be ignored. The
parser will do a best-effort interpretation of any query entered.
* It uses minimal syntax to express queries. All available operators are
single characters or pairs of single characters.
* The parser is hand-written and in a single Java file making it easy to modify.
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