如何从 qdap::mgsub() 平滑切换到 textclean::mgsub()？

Question

由于 R 版本问题，我需要在 qdap::mgsub() 和 textclean::mgsub() 之间切换。除了参数的顺序之外，功能几乎相同：

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

我有很多使用qdap::mgsub() 的代码。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）一种优雅的方式在这两个函数之间切换而无需更改参数的顺序？

Answer 1

想了@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qdap::mgsub并将reorder_mgsub替换

此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。

Answer 2

您可以使用正则表达式替换您在其中调用旧函数的每个文件的文本中出现的位置，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)
}

然后你会调用每个相关的path（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）。下面是函数gsub()部分的演示：

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)

Answer 3

嗯，您也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
}

紧随其后

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，并且使用textclean::mgsub 的任何代码现在都将使用您更新的函数。这样就不需要修改所有的代码了。