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Functions to handle basic input output, these functions always read and write UTF-8 files and provide more explicit control over line endings.
library(brio)
#>
#> Attaching package: 'brio'
#> The following objects are masked from 'package:base':
#>
#> readLines, writeLines
write_lines(c("abc", "123"), "my-file")
# Write with windows newlines
write_lines(c("abc", "123"), "my-file-2", eol = "\r\n")
file_line_endings("my-file")
#> [1] "\n"
file_line_endings("my-file-2")
#> [1] "\r\n"
read_lines("my-file")
#> [1] "abc" "123"
unlink(c("my-file", "my-file-2"))brio also has readLines() and writeLines() functions drop-in replacements for base::readLines() and base::writeLines(). These functions are thin wrappers around brio::read_lines() and brio::write_lines(), with deliberately fewer features than the base equivalents. If you want to convert a package to using brio you can add the following line and re-document.
Speed is not necessarily a goal of brio, but it does end up being a nice side effect.
gen_random <- function(characters, num_lines, min, max) {
line_lengths <- sample.int(max - min, num_lines, replace = TRUE) + min
vapply(line_lengths, function(len) paste(sample(characters, len, replace = TRUE), collapse = ""), character(1))
}
set.seed(42)
# generate 1000 random lines between 100-1000 characters long
data <- gen_random(letters, 1000, min = 100, max = 1000)
brio::write_lines(data, "benchmark")Reading speeds are a decent amount faster with brio, mainly due to larger block sizes and avoidance of extra copies.
bench::mark(
brio::read_lines("benchmark"),
readr::read_lines("benchmark"),
base::readLines("benchmark")
)
#> # A tibble: 3 × 6
#> expression min median `itr/sec` mem_alloc `gc/sec`
#> <bch:expr> <bch:tm> <bch:tm> <dbl> <bch:byt> <dbl>
#> 1 brio::read_lines("benchmark") 886.62µs 891.11µs 1119. 8.05KB 0
#> 2 readr::read_lines("benchmark") 2.69ms 2.92ms 342. 12.72MB 19.7
#> 3 base::readLines("benchmark") 2.97ms 2.98ms 335. 31.39KB 0Write speeds are basically the same regardless of method, though brio does avoid some extra memory allocations.
bench::mark(
brio::write_lines(data, "benchmark"),
readr::write_lines(data, "benchmark"),
base::writeLines(data, "benchmark"),
check = FALSE
)
#> # A tibble: 3 × 6
#> expression min median `itr/sec` mem_alloc
#> <bch:expr> <bch:tm> <bch:tm> <dbl> <bch:byt>
#> 1 brio::write_lines(data, "benchmark") 496.02µs 518.1µs 1911. 0B
#> 2 readr::write_lines(data, "benchmark") 7.16ms 7.61ms 111. 106KB
#> 3 base::writeLines(data, "benchmark") 508.65µs 540.83µs 1809. 0B
#> # … with 1 more variable: `gc/sec` <dbl>
unlink("benchmark")Please note that the brio project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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