Nothing
`+.timeline` <- function(e1,e2){
if(missing(e2))return(e1)
# two timepoints
if(inherits(e1,'timepoint') && inherits(e2,'timepoint'))stop('addition is undefined for two timepoints')
# one timepoint
if(inherits(e1,'timepoint')){
as <- class(e1)[[1]]
e2 <- as.second(e2)
}
if(inherits(e2,'timepoint')){
as <- class(e2)[[1]]
e1 <- as.second(e1)
}
# zero timepoints, two durations
if(inherits(e1,'duration') && inherits(e2,'duration')){
as <- class(e1)[[1]]
if(!identical(class(e1)[[1]],class(e2)[[1]])){
message('coercing to ',class(e1)[[1]])
e2 <- match.fun(glue('as.',as))(e2)
}
}
# zero timepoints, one duration
if(inherits(e1,'duration') && !inherits(e2,'timeline')){
as <- class(e1)[[1]]
e2 <- match.fun(glue('as.',as))(e2)
}
if(inherits(e2,'duration') && !inherits(e1,'timeline')){
as <- class(e2)[[1]]
e1 <- match.fun(glue('as.',as))(e1)
}
e1 <- as.numeric(e1)
e2 <- as.numeric(e2)
res <- e1 + e2
res <- match.fun(glue('as.',as))(res)
res
}
`-.timeline` <- function(e1,e2){
if(missing(e2)) if(any(c('mDateTime','mDate') %in% class(e1)))warning('negative mDate and mDateTime may not be meaningful')
if(missing(e2))return(e1 * (-1))
# x - timepoint
#if(inherits(e2,'timepoint'))stop('subtracting a timepoint is undefined')
if(inherits(e2,'timepoint') && !inherits(e1,'timepoint') )stop('subtracting a timepoint from non-timepoint is undefined')
# timepoint - timepoint
# timepoint - duration
# timepoint - any
if(inherits(e1,'timepoint')){
if(inherits(e2,'timepoint'))e1 <- as.second(e1)
as <- class(e1)[[1]]
e2 <- as.second(e2)
}
# duration - duration
# duration - any
if(inherits(e1,'duration')){
as <- class(e1)[[1]]
e2 <- match.fun(glue('as.',as))(e2)
}
# any - duration
if(!inherits(e1,'timeline')){
as <- class(e2)[[1]]
e1 <- match.fun(glue('as.',as))(e1)
}
e1 <- as.numeric(e1)
e2 <- as.numeric(e2)
res <- e1 - e2
res <- match.fun(glue('as.',as))(res)
res
}
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