exp.replace <- function(expression.in){
alias <- expression.in
expression.out <- expression.in
# test for percent-based text
expression.out <- sub(pattern='%', replacement='', x=expression.out)
expression.out <- sub(pattern='missing', replacement='is.na', x=expression.out)
if (grepl(pattern='==',x=expression.out)){
return(list(expression=expression.out,alias=alias))
} else {
expression.out <- sub(pattern='=', replacement='==', x=expression.out)
return(list(expression=expression.out,alias=alias))
}
}
date.replace <- function(date.form){
alias.date <- list("YYYY-mm-dd HH:MM" = "%Y-%m-%d %H:%M",
"mm/dd/YYYY HH:MM" = "%m/%d/%Y %H:%M")
if (!date.form %in% names(alias.date)){
stop(paste('date format ',date.form,' not supported'))
}
u.i <- which(grepl(date.form, names(alias.date)))
return(alias.date[[u.i]])
}
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