[antlr-interest] Help with simple Logic or Query Syntax.
Mark R. Diggory
mdiggory at latte.harvard.edu
Fri Feb 3 13:34:52 PST 2006
Hello,
I'm attempting to create a parser for some simple query syntax our
project maintains, its similar but simpler to that of Lucene. The basic
syntax is
term op value BOOL term op value with parentheses and double quotes
allowed around values. So for instance as an example:
(title="Something cool" AND author=foo AND date>=2001) OR "Something
Completely Different"
I'm challenged in that while I grok BNF, I can't read write it yet: At
least I know the basics of our syntax as a starting point, I'm unsure if
this is correct.
query ::= term (bool term)*
term ::= (index op value) | value
term ::= word
value ::= word and quoted words
op ::= < > = <> != <= =>
bool ::= AND OR NOT
thanks for any tips,
Mark
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