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Testing delayed evaluation in pipes
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`%>>>%`<-function(lhs,rhs){ | |
parent <- parent.frame() | |
env <- new.env(parent = parent) | |
chain_parts <- magrittr:::split_chain(match.call(), env = env) | |
eval(as.call(call("%>%",call("%>%",chain_parts$lhs$lhs,substitute(play)),chain_parts$lhs$rhs))) | |
} | |
play<-function(lhs){ | |
delayedexpr<-as.list(attr(lhs,"delayedeval")) | |
delayedFunc<-delayedexpr[[length(delayedexpr)]] | |
tmp_delayedFunc<-c(delayedFunc[[1]],quote(lhs)) | |
if(length(delayedFunc)>1){ | |
tmp_delayedFunc<-c(tmp_delayedFunc,as.list(delayedFunc)[-1]) | |
} | |
delayedexpr[[length(delayedexpr)]]<-as.call(tmp_delayedFunc) | |
eval(as.call(delayedexpr)) | |
} | |
`%||%` <- function (lhs, rhs) { | |
parent <- parent.frame() | |
env <- new.env(parent = parent) | |
chain_parts <- magrittr:::split_chain(match.call(), env = env) | |
tmp_lhs<-chain_parts[["lhs"]]$lhs | |
# delayedFunc<-as.list(tmp_lhs[[length(tmp_lhs)]])[[1]] | |
# tmp_lhs[[length(tmp_lhs)]]<-delayedFunc | |
#if rhs is an object, handle it this way | |
attr(rhs,'delayedeval')<-tmp_lhs | |
class(rhs)<-c(class(rhs),'delayedeval') | |
return(rhs) | |
} | |
set.seed(42) | |
df<-data.frame(x=LETTERS, | |
y=runif(26), | |
z=sample(letters,26,replace = TRUE)) | |
df2<-data.frame(x=LETTERS, | |
w=sample(c(1,2),size = 26,replace = TRUE)) | |
tmpvar1<-df2 %>% | |
filter(w==1) | |
left_join_test <- df %>% | |
mutate(vowel=LETTERS%in%c("A","E","I","O","U","Y")) %>% | |
filter(y>.5) %>% | |
left_join(tmpvar1,by="x") %>% | |
filter(!is.na(w)) | |
left_join_test2 <- df %>% | |
mutate(vowel=LETTERS%in%c("A","E","I","O","U","Y")) %>% | |
filter(y>.5) %>% | |
left_join(by="x") %||% | |
df2 %>% | |
filter(w==1) %>>>% | |
filter(!is.na(w)) | |
testthat::expect_equal(left_join_test2,left_join_test) | |
tmpvar2<-df2 %>% | |
filter(x%in%c("A","E","I","O","U","Y")) %>% | |
select(w) | |
cor_result <- df %>% | |
filter(x%in%c("A","E","I","O","U","Y")) %>% | |
select(y) %>% | |
cor(tmpvar2) | |
cor_test2 <- df %>% | |
filter(x%in%c("A","E","I","O","U","Y")) %>% | |
select(y) %>% | |
cor() %||% | |
df2 %>% | |
filter(x%in%c("A","E","I","O","U","Y")) %>% | |
select(w) %>% | |
play() | |
testthat::expect_equal(cor_test2,cor_result) | |
vortexing
commented
May 23, 2019
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