[英]read roxygen2 @importFrom when reading R code
我想將R函數讀入環境並將其依賴的函數導入roxygen2內聯文檔中列出。 這模仿了加載R包的行為,但對於不屬於包的R腳本則這樣做。
如何在包外部獲取R函數並導入包中所依賴的R函數?
gh_file.R
是一個R函數,可從GitHub存儲庫下載文件。 它不是包的一部分,而是作為GitHub gist提供 。
一眼看到roxygen2注釋,表明gh_file.R
應該從其他包中導入幾個函數。
#' @importFrom gh gh
#' @importFrom stringi stri_match_all_regex
#' @importFrom purrr %||% keep
#' @importFrom base64enc base64decode
# read in the R function from GitHub Gist
library(devtools)
devtools::source_gist("gist.github.com/noamross/73944d85cad545ae89efaa4d90b049db",
filename = "gh_file.R")
# attempt to use new R function to import a .csv file from GitHub (FAILS)
ghurl <- "github.com/wpetry/RockyMountainAphids/blob/master/Palmer1952hostlist.csv"
aphids <- read.csv(text = readBin(gh_file(url = ghurl, to_disk = FALSE)))
返回錯誤:
Error in stri_match_all_regex(url, "(github\\.com/)?([^\\/]+)/([^\\/]+)/[^\\/]+/([^\\/]+)/([^\\?]+)") :
could not find function "stri_match_all_regex"
# load packages from which gh_file.R function imports
library(gh)
library(stringi)
library(purrr)
library(base64enc)
aphids <- read.csv(text = readBin(gh_file(url = ghurl, to_disk = FALSE), "character"))
head(aphids)
作品!
host host_common aphid
1 Abies concolor White Fir Cinara curvipes
2 Abies concolor White Fir Cinara occidentalis
3 Abies lasiocarpa Alpine Fir Cinara curvipes
4 Abies lasiocarpa Alpine Fir Cinara lasiocarpae
5 Abies lasiocarpa Alpine Fir Cinara occidentalis
6 Abies lasiocarpa Alpine Fir Mindarus abietinus
您可以解析腳本以獲得庫列表,然后加載它們。
loadlib <- function(fpath) {
l <- readLines(fpath)
libs <- lapply(strsplit(l[grepl("@import", l)], " "), `[[`, 3)
lapply(libs, library, character.only=TRUE)
}
loadlib("gh_file.R")
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