* Fixes weeklies parsing, causing certain futures to be inaccessible in Algorithm
The FuturesExpiryFunction expects the contract month of the Future,
not the expiration. As a result, the contract gets filtered as a
weekly contract, rather than as a standard due to the discrepancy
between the expiry dates when the contract month differs from the
expiry date's month.
A very important fact to note is that futures can and do expire prior
to the contract month. BZ,(brent crude financial futures) expire two
months prior to the contract month, CL one month prior, etc.
There has been an addition that contains a "reverse" futures expiry function
lookup table. We use this to lookup the contract month to re-calculate
the Future expiry.
This PR also fixes dairy and adds extra expiry dates. Dairy can have
an expiry *after* the contract month, so a new path was added to the
SymbolRepresentation to ensure that these contracts are loaded
correctly.
* Address review: Adds tests and fixes bug in SymbolRepresentation
* Updates SID comment on `Date` property to reflect fact that we use
future expiry for its value
* Fixes bug in SymbolRepresentation where expiration day would always
be 01 when parsing a contract with an expiration after the contract
month
* Fixes bug in SybmolRepresentation where expiration year would be
four digits long when parsing a contract with an expiration after
the contract month
* Fixes some bad dairy expiry dates
* Adds tests for SymbolRepresentation and the futures filtering for
standard contracts
* Renames method used to extract delta between contract month and
expiry date
* Removes GH comment and restores Futures contract month expiry param
Gerardo Salazar
0f0a2bc9a8