如何访问tibble列表以检查“UTF-8”是否运行导入R.

Question

TARGET：在导入和rbind之前检查文件列表是否具有相同的编码，如果不是相同的STOP运行

# files list & check encoding
FL_PATH <- list.files(path,pattern = "*.csv",full.name = T)
library(readr)
lapply(FL_PATH,guess_encoding)

# if there is "UTF-8" , STOP RUN , if "Shift_JIS" , RUN the next scripts below :

# import
library(rio)
DT <- rbindlist(lapply(FL_PATH ,import,sep=",",setclass = "data.table"))

# OVER 500 rows to run if the files are same encoding to rbind
DT[,"NEW_COL":="A"]
DT[,"NEW_COL_2":="B"]
.....

# result of --lapply(FL_PATH,guess_encoding)
> lapply(FL_PATH,guess_encoding)
[[1]]
# A tibble: 3 x 2
  encoding  confidence
  <chr>          <dbl>
1 Shift_JIS       0.8 
2 GB18030         0.76
3 Big5            0.46

[[2]]
# A tibble: 3 x 2
  encoding  confidence
  <chr>          <dbl>
1 GB18030         0.82
2 UTF-8       0.8 
3 Big5            0.44

• 问题1：如何访问lapply readr的结果变量以检测UTF-8和STOP（如果存在UTF-8，则必须修改R外的编码？）
• 问题2：如何使用“if＆STOP run”连接大量正常处理脚本？

Answer 1

首先，获得最可能的编码：

enc <- sapply(FL_PATH,function(x) guess_encoding(x)$encoding[1])

然后，如果任何文件是UTF-8，则停止执行。

if(any(grepl('UTF-8',enc)))
  stop('UTF-8 present') # This will stop with an error if true
# Now, read files and rbind
dlist <- lapply(FL_PATH,read_csv)
DT <- rbindlist(dlist)