event-sets: Combine events

In DavisVaughan/almanac3: Tools for Adjusting and Generating Dates Using a Grammar of Schedules

Description

Set operations between events are what make the grammar of schedules so powerful. For example, on_mday(25) & on_wday("Mon") takes the intersection of these two events, resulting in a new event that only occurs when the 25th day of the month is also a Monday.

• & / event_intersect(): Take the intersection of two events, creating a new event that occurs when both x and y occured.

• | / event_union(): Take the union of two events, creating a new event that occurs when either x or y occured.

• - / event_difference(): Take the difference of two events, creating a new event that occurs when x occured, but y did not.

• ! / event_invert(): Invert an event, creating a new event that occurs when x did not occur.

Usage

event_intersect(x, y)

event_union(x, y)

event_diff(x, y)

event_invert(x)

## S3 method for class 'event'
e1 & e2

## S3 method for class 'event'
e1 | e2

## S3 method for class 'event'
e1 - e2

## S3 method for class 'event'
!x

Arguments

x, y, e1, e2

[event] Events to perform a set operation on.

DavisVaughan/almanac3 documentation built on Oct. 30, 2019, 5:59 a.m.