fix code parser for := operator

DESCRIPTION

@@ -35,6 +35,7 @@ Imports:
     utils
 Suggests:
     cli (>= 3.4.0),
+    data.table (>= 1.16.2),
     knitr (>= 1.42),
     rmarkdown (>= 2.23),
     shiny (>= 1.6.0),
@@ -47,7 +48,7 @@ RdMacros:
     lifecycle
 Config/Needs/verdepcheck: mllg/checkmate, r-lib/lifecycle, r-lib/rlang,
     r-lib/cli, yihui/knitr, rstudio/rmarkdown, rstudio/shiny,
-    r-lib/testthat, r-lib/withr
+    r-lib/testthat, r-lib/withr, Rdatatable/data.table
 Config/Needs/website: insightsengineering/nesttemplate
 Encoding: UTF-8
 Language: en-US

R/utils-get_code_dependency.R

@@ -106,6 +106,7 @@ extract_calls <- function(pd) {
   calls <- Filter(function(call) !(nrow(call) == 1 && call$token == "';'"), calls)
   calls <- Filter(Negate(is.null), calls)
   calls <- fix_shifted_comments(calls)
+  calls <- remove_dt_assign(calls)
   fix_arrows(calls)
 }
 
@@ -148,6 +149,22 @@ fix_shifted_comments <- function(calls) {
 #' which is \code{`<-`(y,x)} instead of traditional `y <- x`.
 #' @keywords internal
 #' @noRd
+remove_dt_assign <- function(calls) {
+  checkmate::assert_list(calls)
+  lapply(calls, function(call) {
+    dt_assign <-
+      which(call$token == "LEFT_ASSIGN" & call$text == ":=")
+    if (length(dt_assign) > 0) {
+      call[-dt_assign, ]
+    } else {
+      call
+    }
+  })
+}
+
+#' Fixes edge case of `:=` assignment operator being treated as assignemnt.
+#' @keywords internal
+#' @noRd
 fix_arrows <- function(calls) {
   checkmate::assert_list(calls)
   lapply(calls, function(call) {

tests/testthat/test-qenv_eval_code.R

@@ -105,6 +105,16 @@ testthat::test_that("eval_code accepts calls containing only comments and empty
   testthat::expect_identical(get_code(eval_code(qenv(), code)), code)
 })
 
+testthat::test_that("eval_code does not treat := as an assignment operator", {
+  testthat::skip_if_not_installed("data.table")
+  code <- "
+  iris <- data.table::data.table(iris) %>%
+    .[, NewSpecies := factor(Species)]
+  "
+  q <- eval_code(qenv(), code)
+  testthat::expect_identical(get_code(q), code)
+})
+
 # comments ----------
 testthat::test_that("comments fall into proper calls", {
   # If comment is on top, it gets moved to the first call.