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qdap::mgsub()由于 R 版本问题，我需要在和之间切换textclean::mgsub()。函数几乎相同，除了参数的顺序：

qdap::mgsub(pattern,replacement,x)
textclean::mgsub(x,pattern,replacement)

我有很多我使用的代码qdap::mgsub()。不幸的是，当我将参数传递给函数时，我没有正确命名它们。所以我需要重新排序所有这些以便能够使用 textclean::mgsub()。

是否有（以编程方式）一种优雅的方式来在这两个函数之间切换而无需更改参数的顺序？

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3 回答 3

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考虑到@duckmayr 的回答，我想出了另一个解决方案来解决我的问题：

首先运行这个函数：

reorder_mgsub <- function(pattern,replacement,x){
  output <- textclean::mgsub(x,pattern,replacement)
  return(output)
}

第二：查找并替换qdap::mgsub为reorder_mgsub

这个解决方案可能不太优雅，因为我必须手动执行第 2 步，但对我来说效果很好。

于 2018-10-10T11:10:37.443 回答
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好吧，您还可以重新分配包中的原始函数以适合您的代码。

即使用mgsub的源代码，

reorder_mgsub <- function(pattern,replacement,x, leadspace = FALSE, trailspace = FALSE, 
fixed = TRUE, trim = FALSE, order.pattern = fixed, safe = FALSE, 
...){
    if (!is.null(list(...)$ignore.case) & fixed) {
        warning(paste0("`ignore.case = TRUE` can't be used with `fixed = TRUE`.\n", 
            "Do you want to set `fixed = FALSE`?"), call. = FALSE)
    }
    if (safe) {
        return(mgsub_regex_safe(x = x, pattern = pattern, replacement = replacement, 
            ...))
    }
    if (leadspace | trailspace) {
        replacement <- spaste(replacement, trailing = trailspace, 
            leading = leadspace)
    }
    if (fixed && order.pattern) {
        ord <- rev(order(nchar(pattern)))
        pattern <- pattern[ord]
        if (length(replacement) != 1) 
            replacement <- replacement[ord]
    }
    if (length(replacement) == 1) {
        replacement <- rep(replacement, length(pattern))
    }
    if (any(!nzchar(pattern))) {
        good_apples <- which(nzchar(pattern))
        pattern <- pattern[good_apples]
        replacement <- replacement[good_apples]
        warning(paste0("Empty pattern found (i.e., `pattern = \"\"`).\n", 
            "This pattern and replacement have been removed."), 
            call. = FALSE)
    }
    for (i in seq_along(pattern)) {
        x <- gsub(pattern[i], replacement[i], x, fixed = fixed, 
            ...)
    }
    if (trim) {
        x <- gsub("\\s+", " ", gsub("^\\s+|\\s+$", "", x, perl = TRUE), 
            perl = TRUE)
    }
    x
}

其次是

assignInNamespace('mgsub', reorder_mgsub, 'textclean')

它应该将您更新的函数分配给textclean包的命名空间，并且正在使用的任何代码textclean::mgsub现在都将使用您更新的函数。这样就无需更改所有代码。

于 2018-12-14T13:26:16.623 回答
1

您可以使用正则表达式替换您调用旧函数的每个文件的文本中的出现，使用如下函数：

replace_mgsub <- function(path) {
    file_text <- readr::read_file(path)
    file_text <- gsub("qdap::mgsub\\(([^, ]+) *, *([^, ]+) *, *([^\\)]) *\\)",
                      "textclean::mgsub\\(\\3, \\1, \\2\\)", file_text)
    readr::write_file(file_text, path)
}

然后你会调用每一个相关path的（我假设你知道你需要调用函数的文件列表；如果没有，请在下面评论，我可以在上面添加一些东西）。gsub()下面是该部分功能的演示：

file_text <- "qdap::mgsub(pattern,replacement,x)"
cat(gsub("qdap::mgsub\\(([^, ]+) *, *([^, ]+) *, *([^\\)]) *\\)",
         "textclean::mgsub\\(\\3, \\1, \\2\\)", file_text))
#> textclean::mgsub(x, pattern, replacement)
file_text <- "# I'll have in this part some irrelevant code
# to show it won't interfere with that
y = rnorm(1000)
qdap::mgsub(pattern,replacement,x)
z = rnorm(10)
# And also demonstrate multiple occurrences of the function
# as well as illustrate that it doesn't matter if you have spaces
# between comma separated arguments
qdap::mgsub(pattern, replacement, x)"
cat(gsub("qdap::mgsub\\(([^, ]+) *, *([^, ]+) *, *([^\\)]) *\\)",
         "textclean::mgsub\\(\\3, \\1, \\2\\)", file_text))
#> # I'll have in this part some irrelevant code
#> # to show it won't interfere with that
#> y = rnorm(1000)
#> textclean::mgsub(x, pattern, replacement)
#> z = rnorm(10)
#> # And also demonstrate multiple occurrences of the function
#> # as well as illustrate that it doesn't matter if you have spaces
#> # between comma separated arguments
#> textclean::mgsub(x, pattern, replacement)
于 2018-10-10T10:17:28.517 回答