adding space and indent functions

NAMESPACE

@@ -32,6 +32,7 @@ export(str_flatten_comma)
 export(str_glue)
 export(str_glue_data)
 export(str_ilike)
+export(str_indent)
 export(str_interp)
 export(str_length)
 export(str_like)
@@ -48,6 +49,7 @@ export(str_replace)
 export(str_replace_all)
 export(str_replace_na)
 export(str_sort)
+export(str_space)
 export(str_split)
 export(str_split_1)
 export(str_split_fixed)

R/indent.R

@@ -0,0 +1,39 @@
+#' Indent multiple strings
+#'
+#' @description
+#' `str_indent()` adds a customizable amount of spaces (or other characters)
+#' before every word, as if it was tabbed, and puts every word on a new line.
+#' @param indent_level controls the number of characters to add,
+#' @param indent_character controls what character is placed.
+#' @returns a newline separated list of words with a 'tab' character in between
+#' @seealso [str_spaceout()] to add spaces between words.
+#' @export
+#' @examples
+#' x <- c("why", "video", "cross", "extra", "deal", "authority")
+#' # Default options
+#' str_indent(x)
+#' # Extra indentation
+#' str_indent(x, indent_level = 4)
+#' # Using periods for visibility
+#' str_indent(x, indent_character = '.')
+#' # Both parameters changed
+#' str_indent(x, indent_level = 6, indent_character = '-')
+
+str_indent <- function(x, indent_level = 3, indent_character = ' ', collapse = NULL) {
+
+  if (indent_level < 0) {
+    stop("Invalid indent level, indent_level must be zero or positive.")
+  }
+  # Create a "tab" string out of 3 spaces or other character
+  indent <- paste0(rep(indent_character, indent_level), collapse = '')
+  new_strings <- gsub("(?m)^", indent, x, perl = TRUE)
+
+  # If vector not atomic, turns it into a single string separated by newlines
+  if (!is.null(collapse)) {
+    new_strings <- paste0(new_strings, collapse = collapse)
+  }
+
+  return(new_strings)
+  # perl must be TRUE to use regular expressions in baser
+}
+

R/space.R

@@ -0,0 +1,48 @@
+#' Split up strings
+#'
+#' @description
+#' `str_space()` adds a space wherever a lowercase letter is followed by an 
+#' uppercase letter, with modifiable functionality for special cases.
+#'
+#' @param split_style controls the placement of splits and can be 
+#' modified to the following styles:
+#' `acronyms`: splits at lowercase-uppercase and between two uppercase letters 
+#' followed by lowercase,
+#' `allcaps`: splits between all consecutive uppercase letters
+#' `default`: splits only when a lowercase letter is succeeded by an uppercase letter
+#' `everything`: splits between every character
+#' 
+#' @param split_char controls the character that splits words.
+#' This defaults to space but can be changed to anything.
+#'
+#' @seealso [str_indent()] to add tabs between words.
+#' @export
+#' @examples
+#' input <- "XMLHTTPRequestAndHTMLParser"
+#' # Default splitting
+#' str_space(input, split_style = "default")
+#' # Split acronyms
+#' str_space(input, split_style = "acronyms")
+#' # Split all consecutive uppercase letters
+#' str_space(input, split_style = "allcaps")
+#' # Split every character
+#' str_space(input, split_style = "everything")
+#'
+
+str_space <- function(x, split_style = "default", split_char = " ") {
+  if (split_style == "acronyms") {
+    # Splits at lowercase-uppercase and between two uppercase letters followed by lowercase
+    str_replace_all(x, "(?<=[a-z])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])", split_char)
+  } else if (split_style == "allcaps") {
+    # Splits between all consecutive uppercase letters
+    str_replace_all(x, "(?<=\\p{Lu})(?=\\p{Lu})", split_char)
+  } else if (split_style == "default") {
+    # Splits only when a lowercase letter is succeeded by an uppercase letter
+    str_replace_all(x, "(?<=[a-z])(?=[A-Z])", split_char)
+  } else if (split_style == "everything") {
+    # Splits between every character
+    str_replace_all(x, "(?<=.)(?=.)", split_char)
+  } else { 
+    stop("Invalid split_style. Choose from 'default', 'acronyms', 'allcaps', or 'everything'.")
+  }
+}

tests/testthat/test-indent.R

@@ -0,0 +1,21 @@
+test_that("indenting works on vectors of different lengths", {
+  expect_equal(str_indent(c("why", "video", "cross", "extra", "deal", "authority")),
+               c("   why", "   video", "   cross", "   extra", "   deal", "   authority"))
+
+  expect_equal(str_indent(c("why", "video", "cross", "extra", "deal", "authority")),
+  c("   why", "   video", "   cross", "   extra", "   deal", "   authority"))
+  expect_equal(str_indent("Jan\nFeb\nMar"), "   Jan\n   Feb\n   Mar")
+})
+
+test_that("indenting works on vectors of different lengths with optional indent character", {
+  expect_equal(str_indent(c("why", "video", "cross", "extra", "deal", "authority"),
+                          indent_character = ".", collapse = "\n"), "...why\n...video\n...cross\n...extra\n...deal\n...authority")
+  expect_equal(str_indent("Jan\nFeb\nMar", indent_character = "."), "...Jan\n...Feb\n...Mar")
+})
+
+test_that("indenting with collapse works", {
+
+  expect_equal(str_indent(c("why", "video", "cross", "extra", "deal", "authority"),
+                          indent_character = ".", collapse = "\n"),
+               "...why\n...video\n...cross\n...extra\n...deal\n...authority")
+})

tests/testthat/test-space.R

@@ -0,0 +1,6 @@
+test_that("str_space works", {
+  expect_equal(str_space("XMLHTTPRequestAndHTMLParser"), "XMLHTTPRequest And HTMLParser")
+  expect_equal(str_space("XMLHTTPRequestAndHTMLParser", "allcaps"), "X M L H T T P RequestAndH T M L Parser")
+  expect_equal(str_space("XMLHTTPRequestAndHTMLParser", "acronyms"), "XMLHTTP Request And HTML Parser")
+  expect_equal(str_space("XMLHTTPRequestAndHTMLParser", "everything"), "X M L H T T P R e q u e s t A n d H T M L P a r s e r")
+})