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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# for compatibility with R versions earlier than 4.0.0
if (!exists("deparse1")) {
deparse1 <- function(expr, collapse = " ", width.cutoff = 500L, ...) {
paste(deparse(expr, width.cutoff, ...), collapse = collapse)
}
}
# for compatibility with R versions earlier than 3.6.0
if (!exists("str2lang")) {
str2lang <- function(s) {
parse(text = s, keep.source = FALSE)[[1]]
}
}
oxford_paste <- function(x, conjunction = "and", quote = TRUE) {
if (quote && is.character(x)) {
x <- paste0('"', x, '"')
}
if (length(x) < 2) {
return(x)
}
x[length(x)] <- paste(conjunction, x[length(x)])
if (length(x) > 2) {
return(paste(x, collapse = ", "))
} else {
return(paste(x, collapse = " "))
}
}
assert_is <- function(object, class) {
msg <- paste(substitute(object), "must be a", oxford_paste(class, "or"))
assert_that(inherits(object, class), msg = msg)
}
assert_is_list_of <- function(object, class) {
msg <- paste(substitute(object), "must be a list of", oxford_paste(class, "or"))
assert_that(is_list_of(object, class), msg = msg)
}
is_list_of <- function(object, class) {
is.list(object) && all(map_lgl(object, ~ inherits(., class)))
}
empty_named_list <- function() structure(list(), .Names = character(0))
r_symbolic_constants <- c(
"pi", "TRUE", "FALSE", "NULL", "Inf", "NA", "NaN",
"NA_integer_", "NA_real_", "NA_complex_", "NA_character_"
)
is_function <- function(expr, name) {
# We could have a quosure here if we have an expression like `sum({{ var }})`
if (is_quosure(expr)) {
expr <- quo_get_expr(expr)
}
if (!is.call(expr)) {
return(FALSE)
} else {
if (deparse(expr[[1]]) == name) {
return(TRUE)
}
out <- lapply(expr, is_function, name)
}
any(map_lgl(out, isTRUE))
}
all_funs <- function(expr) {
# It is not sufficient to simply do: setdiff(all.names, all.vars)
# here because that would fail to return the names of functions that
# share names with variables.
# To preserve duplicates, call `all.names()` not `all_names()` here.
if (is_quosure(expr)) {
expr <- quo_get_expr(expr)
}
names <- all.names(expr)
names[map_lgl(names, ~ is_function(expr, .))]
}
all_vars <- function(expr) {
setdiff(all.vars(expr), r_symbolic_constants)
}
all_names <- function(expr) {
setdiff(all.names(expr), r_symbolic_constants)
}
is_constant <- function(expr) {
length(all_vars(expr)) == 0
}
read_compressed_error <- function(e) {
msg <- conditionMessage(e)
if (grepl(" codec ", msg)) {
compression <- sub(".*Support for codec '(.*)'.*", "\\1", msg)
e$message <- paste0(
msg,
"\nIn order to read this file, you will need to reinstall arrow with additional features enabled.",
"\nSet one of these environment variables before installing:",
sprintf("\n\n * LIBARROW_MINIMAL=false (for all optional features, including '%s')", compression),
sprintf("\n * ARROW_WITH_%s=ON (for just '%s')", toupper(compression), compression),
"\n\nSee https://arrow.apache.org/docs/r/articles/install.html for details"
)
}
stop(e)
}
handle_parquet_io_error <- function(e, format) {
msg <- conditionMessage(e)
if (grepl("Parquet magic bytes not found in footer", msg) && length(format) > 1 && is_character(format)) {
# If length(format) > 1, that means it is (almost certainly) the default/not specified value
# so let the user know that they should specify the actual (not parquet) format
abort(c(
msg,
i = "Did you mean to specify a 'format' other than the default (parquet)?"
))
}
stop(e)
}
is_writable_table <- function(x) {
inherits(x, c("data.frame", "ArrowTabular"))
}
# This attribute is used when is_writable is passed into assert_that, and allows
# the call to form part of the error message when is_writable is FALSE
attr(is_writable_table, "fail") <- function(call, env) {
paste0(
deparse(call$x),
" must be an object of class 'data.frame', 'RecordBatch', or 'Table', not '",
class(env[[deparse(call$x)]])[[1]],
"'."
)
}
#' Recycle scalar values in a list of arrays
#'
#' @param arrays List of arrays
#' @return List of arrays with any vector/Scalar/Array/ChunkedArray values of length 1 recycled
#' @keywords internal
recycle_scalars <- function(arrays) {
# Get lengths of items in arrays
arr_lens <- map_int(arrays, NROW)
is_scalar <- arr_lens == 1
if (length(arrays) > 1 && any(is_scalar) && !all(is_scalar)) {
# Recycling not supported for tibbles and data.frames
if (all(map_lgl(arrays, ~ inherits(.x, "data.frame")))) {
abort(c(
"All input tibbles or data.frames must have the same number of rows",
x = paste(
"Number of rows in longest and shortest inputs:",
oxford_paste(c(max(arr_lens), min(arr_lens)))
)
))
}
max_array_len <- max(arr_lens)
arrays[is_scalar] <- lapply(arrays[is_scalar], repeat_value_as_array, max_array_len)
}
arrays
}
#' Take an object of length 1 and repeat it.
#'
#' @param object Object of length 1 to be repeated - vector, `Scalar`, `Array`, or `ChunkedArray`
#' @param n Number of repetitions
#'
#' @return `Array` of length `n`
#'
#' @keywords internal
repeat_value_as_array <- function(object, n) {
if (inherits(object, "ChunkedArray")) {
return(Scalar$create(object$chunks[[1]])$as_array(n))
}
return(Scalar$create(object)$as_array(n))
}
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