minutemap 0.1.1

Provides a data type for mapping a value to every minute of a year and then resolve a value given a date

(YEARLY) MINUTE MAP

The idea is you can specify a value (int by default) for any and every minute of an entire year. Which particular year isn't representable. Hierarchical specifiiers and priority matching rules are employed to determine the value for any given minute of the year. A specification takes the form of a set of <expression, value> pairs in JSON or as a dictionary.

An expression is a dot-separated sequence of time tokens. The wildcard "*" may appear as a standalone spec or as a leaf segment, and means "everything else" not matched my siblings at this level.

The method YearMinuteMap.get_value() takes a datetime, and returns a value by selecting the most specific matching spec's value . Example:

my_minute_map =  {
  "*": 8,
  "h5-10": 28,
  "h19": {
    "*": 18,
    "m30-59": 22
  },
  "q2": {
    "h0-4": 10,
    "h5-10": 30,
    "h11-18": 10,
    "h19-23": 20,
  },
  "q3": {
    "h0-4": 12,
    "h5-10": 32,
    "h11-18": 12,
    "h19-23": 20,
    "sun": {
      "h0-4": 14,
      "h5-10": 34,
      "h11-18": 14,
      "h19-23": 23,
    }
  }
}
spec = YearMinuteMap(my_minute_map)
spec.get_value(my_date) # -> value

Input may be a flat or arbitrarily nested dict; nested dicts are flattened by joining their key paths with ".". Both dict and JSON string are accepted. Flat Example:

  {
    "*": 1,
    "q1": 2,
    "q1.sun.h1-10.m1": 3
    "q1.sun.h1-10.m2": 4
  }

EBNF for expression:

SPEC      ::= "*" | PATH
PATH      ::=
  ( QTR | ( "." ( _DOM | _DOW | _HH | MM ) )? )
  | ( MOY | ( "." ( _DOM | _DOW | _HH | MM ) )? )
  | WOY ( "." ( _DOW | _HH | MM ) )?
  | DOY ( "." ( _HH | MM ) )?
  | _DOM
  | _DOW
  | _HH
  | MM
_DOM        = DOM ( "." ( _HH | MM ) )?
_DOW        = DOW ( "." ( _HH | MM ) )?
_HH         = HH ( "." MM )?
QTR       ::= "q1" | "q2" | "q3" | "q4"
MOY       ::= "moy" RANGE      // 1-12
WOY       ::= "woy" RANGE      // 1–53 (ISO weeks can be 53)
DOY       ::= "doy" RANGE      // 1–366
DOM       ::= "dom" RANGE      // 1–31
DOW       ::= "dow" RANGE      // 1-7
HH        ::= "h" RANGE        // 0–23
MM        ::= "m" RANGE        // 0–59
RANGE     ::= DIGITS | DIGITS "-" DIGITS

The grammar does not allow use of the same type of token twice (ex "dom12.dom13") or certain chaining (ex "q1.apr").

MOY and DOW have aliases MONTH and WEEKDAY not shown in EBNF:

MONTH     ::= "jan" | "feb" | "mar" | "apr" | "may" | "jun" |
              "jul" | "aug" | "sep" | "oct" | "nov" | "dec"
WEEKDAY   ::= "mon" | "tue" | "wed" | "thu" | "fri" | "sat" | "sun"

Token reference:

    q1..q4          Quarter (maps to moy range internally)
    moy<range>      Month of year    1-12   (aliases: jan…dec)
    woy<range>      ISO week         1-53
    doy<range>      Day of year      1-366
    dom<range>      Day of month     1-31
    dow<range>      Day of week      1-7    (aliases: mon…sun, 1=Mon)
    h<range>        Hour             0-23
    m<range>        Minute           0-59
    *               Wildcard leaf — "match everything from here"
    RANGE ::= DIGITS | DIGITS "-" DIGITS

Tie breaking:

Longer (more dots) paths beat shorter ones. The following order is used for tie breaks (TODO: allow user to specify ordering):

    QTR < MOY < DOW < DOM < WOY < DOY < HH < MM