R 编码 - 用错误的字符保存为 UTF-8（我认为）

debugcn 发表于 Dev

格雷格

我有一个文件明确说它是 UTF-8，unix 命令file -i说它被编码为 UTF-8，但是当我将它加载到 R 中时（使用带有 UTF8 编码的 readr），我仍然可以清楚地分辨出多字节字符错了。当我指定“Windows-1252”（基于此图表，我很确定它最初的编码方式）作为编码时，我得到了更多不正确的字符。

我认为发生的事情是有人将这些不正确的字符保存为 UTF-8。有没有办法恢复原文？

以下是通过指定编码进行修复的尝试：

library(curl)
library(readr)
#> 
#> Attaching package: 'readr'
#> The following object is masked from 'package:curl':
#> 
#>     parse_date

text_file <- tempfile()
curl_download("https://dl.dropboxusercontent.com/s/7syikmmiduubsqv/test.txt", text_file)


# Default is UTF-8, other specifications add extra characters
read_lines(text_file)
#> [1] "{ProvÃƒÂncia}"
# read_lines(text_file, locale = locale(encoding = "UTF-8")) # same
read_lines(text_file, locale = locale(encoding = "Windows-1252"))
#> [1] "{ProvÃƒ<U+0083>Ã‚Ância}"
read_lines(text_file, locale = locale(encoding = "latin1"))
#> [1] "{ProvÃƒ<U+0083>Ã‚Ância}"

# Same as equivalent readr code
# readLines(text_file)
# readLines(text_file, encoding = "UTF-8")
# readLines(text_file, encoding = "UTF-8-BOM")
# readLines(text_file, encoding = "Windows-1252")

# Desired text: "{Prov\u00EDncia}"

更新

反向编码（例如Stat545示例）不起作用

iconv(read_lines(text_file), from = "UTF-8", to = "Latin1")
#> [1] "{ProvÃncia}"
iconv(read_lines(text_file), from = "UTF-8", to = "Windows-1252")
#> [1] "{ProvÃncia}"

格雷格

好吧，我想有更好的方法来解决这个问题，但在有人发布之前，这里有一个解决方案，可以从网站创建表格并将其替换为文本。

（需要纵梁）

# Create the Debugging table from http://www.i18nqa.com/debug/utf8-debug.html
# UTF-8 characters were interpreted as Windows-1252 and then saved
# as UTF-8
create_utf_crosswalk <- function() {
  # Affects Windows-1252 0x80 - 0xFF (but a few characters aren't in
  # the spec, so  remove them)
  hex_codes <- sprintf("%x", seq(strtoi("0x80"), strtoi("0xFF")))
  hex_codes <- hex_codes[!hex_codes %in% c("81", "8d", "8f", "90", "9f")]

  actual_chars_locale <- vapply(hex_codes, FUN.VALUE = character(1), function(x) {
    parse(text = paste0("'\\x", x, "'"))[[1]]
  })

  actual_chars_utf <- iconv(actual_chars_current, to = "UTF-8")

  mangled_chars_utf <- vapply(actual_chars_utf, FUN.VALUE = character(1), 
  function(
    Encoding(x) <- "Windows-1252"
    x
  })

  out <- actual_chars_utf
  names(out) <- mangled_chars_utf
  out
}

text_file <- tempfile()
curl::curl_download("https://dl.dropboxusercontent.com/s/7syikmmiduubsqv/test.txt", text_file)
test_text <- readr::read_lines(text_file)

utf_fix <- create_utf_crosswalk()

stringr::str_replace_all(test_text, utf_fix)
#> [1] "{Província}"

更新

想出了一个直接的解决方案，它适用于示例文本，但不适用于完整文件（也许我没有指定完全正确的文件编码）。

text <- readLines("https://dl.dropboxusercontent.com/s/7syikmmiduubsqv/test.txt")

fixed <- iconv(text, from = "UTF-8", to = "Windows-1252")
Encoding(fixed) <- "UTF-8"

fixed

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