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Subject: CQL Parsing Questions
Hi: I have two CQL questions which may be parser issues rather than CQL spec issues per se. (I am using Mike Taylor's Java parser.) 1. Unrecognized booleans I can't seem to get an error from the parser on unrecognized booleans (here 'but'): % cql 'foo=1 but bar=2' <searchClause> <index>bar</index> <relation> <value>=</value> </relation> <term>2</term> </searchClause> I asked Mike about this and he said: "It interacts badly with another, better rule, which says that index-relation pairs nested within a clause override those outside the clause -- so that title=(author=kernighan) is equivalent to author=kernighan " and following up with him he claimed this was cooked into the BNF although I don't pretend to understand the original BNF (my head hurts with all the recursion). The parser can be coaxed though to give an error by grouping as: % cql '(foo=1) but (bar=2)' Syntax error: expected boolean, got word: but (For reference a recognized boolean, 'and' say, is parsed as given below at end of message.) 2. Legal term characters From the production rule for simple strings I am assuming that a term such as '2009-09-09' should be valid (without quotes), and yet the parser complains as: % cql 'x=2009-09-09' Syntax error: expected boolean, got -9 Is that incorrect behaviour? Quoting the term of course produces a valid parse: % cql 'x="2009-09-09"' <searchClause> <index>x</index> <relation> <value>=</value> </relation> <term>2009-09-09</term> </searchClause> I wasn't sure where to send these questions. Like I said I did ask Mike about the first. Cheers, Tony * Recognized boolean (for reference) % cql 'foo=1 and bar=2' <triple> <boolean> <value>and</value> </boolean> <leftOperand> <searchClause> <index>foo</index> <relation> <value>=</value> </relation> <term>1</term> </searchClause> </leftOperand> <rightOperand> <searchClause> <index>bar</index> <relation> <value>=</value> </relation> <term>2</term> </searchClause> </rightOperand> </triple> ******************************************************************************** DISCLAIMER: This e-mail is confidential and should not be used by anyone who is not the original intended recipient. If you have received this e-mail in error please inform the sender and delete it from your mailbox or any other storage mechanism. Neither Macmillan Publishers Limited nor any of its agents accept liability for any statements made which are clearly the sender's own and not expressly made on behalf of Macmillan Publishers Limited or one of its agents. Please note that neither Macmillan Publishers Limited nor any of its agents accept any responsibility for viruses that may be contained in this e-mail or its attachments and it is your responsibility to scan the e-mail and attachments (if any). No contracts may be concluded on behalf of Macmillan Publishers Limited or its agents by means of e-mail communication. Macmillan Publishers Limited Registered in England and Wales with registered number 785998 Registered Office Brunel Road, Houndmills, Basingstoke RG21 6XS ********************************************************************************
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