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All these four cql expressions result in the same parse tree when sent to new CQLParser().parse(cql).toXCQL():

foo bar
"foo bar"
cql.serverChoice=foo bar
cql.serverChoice="foo bar"

When sending these other four cql expressions only the two quoted work, the two unquoted result in CQLParseException: expected index or term, got EOF:

foo bar.baz
"foo bar.baz"
cql.serverChoice=foo bar.baz
cql.serverChoice="foo bar.baz"

This is inconsistent. Either accept all unquoted or no unquoted expressions.

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The line here in the CQLLexer allows certain characters from being escaped:

The CQL spec says:

Double quotes enclosing a sequence of any characters except double quote (unless preceded by backslash ()). Backslash escapes the character following it. The resultant value includes all backslash characters except those releasing a double quote (this allows other systems to interpret the backslash character). The surrounding double quotes are not included.

I'm curious why those specific characters are included and how those characters mean that they release a double quote.

It is actually making it impossible for me to represent a Windows-style file path, for example:

file = some\\path\\in\\windows\.exe

This gets turned into:

file = some\\path\\in\\windows.exe

because the . character is not on that list.

I happen to have a regular expression interpreter following the CQL parse that needs the value to be file = some\\path\\in\\windows\.exe. If I know that the CQL parser is consistently escaping the following character, I could just pass in: file=some\\\\path\\\\in\\\\windows\\.exe or if it consistently ignores it: file=some\\path\\in\\windows\.exe.

Hello ,
what I need is a parser that starting from DDL (create, alter tables and other instructions) will get info about the schema into a java object.

Trying to use this library I'm getting CQLParseException:

Error parsing cql schema org.z3950.zing.cql.CQLParseException: expected boolean, got '('

Error parsing cql schema org.z3950.zing.cql.CQLParseException: expected index or term, got EOF

This library is suitable for this type of thing?
Thanks in advance