[jira] [Created] (LUCENE-5336) Add a simple QueryParser to parse human-entered queries.

["Jack Conradson (JIRA)" <ji...@apache.org>]

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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