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# kate: default-dictionary en_US
## This file is part of the 'stringi' package for R.
## Copyright (c) 2013-2024, Marek Gagolewski <https://www.gagolewski.com/>
## All rights reserved.
##
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## this list of conditions and the following disclaimer.
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## 2. Redistributions in binary form must reproduce the above copyright notice,
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#' @title
#' Pad (Center/Left/Right Align) a String
#'
#' @description
#' Add multiple \code{pad} characters at the given \code{side}(s) of each string
#' so that each output string is of total width of at least \code{width}.
#' These functions may be used to center or left/right-align each string.
#'
#' @details
#' Vectorized over \code{str}, \code{width}, and \code{pad}.
#' Each string in \code{pad} should consist of a code points of total width
#' equal to 1 or, if \code{use_length} is \code{TRUE}, exactly one code point.
#'
#' \code{stri_pad} is a convenience function, which dispatches
#' to \code{stri_pad_*}.
#'
#' Note that Unicode code points may have various widths when
#' printed on the console and that, by default, the function takes that
#' into account. By changing the state of the \code{use_length}
#' argument, this function starts acting like each code point
#' was of width 1. This feature should rather be used with
#' text in Latin script.
#'
#' See \code{\link{stri_trim_left}} (among others) for reverse operation.
#' Also check out \code{\link{stri_wrap}} for line wrapping.
#'
#' @param str character vector
#' @param width integer vector giving minimal output string lengths
#' @param side [\code{stri_pad} only] single character string;
#' sides on which padding character is added
#' (\code{left} (default), \code{right}, or \code{both})
#' @param pad character vector giving padding code points
#' @param use_length single logical value; should the number of code
#' points be used instead of the total code point width
#' (see \code{\link{stri_width}})?
#'
#' @return These functions return a character vector.
#'
#' @examples
#' stri_pad_left('stringi', 10, pad='#')
#' stri_pad_both('stringi', 8:12, pad='*')
#' # center on screen:
#' cat(stri_pad_both(c('the', 'string', 'processing', 'package'),
#' getOption('width')*0.9), sep='\n')
#' cat(stri_pad_both(c('\ud6c8\ubbfc\uc815\uc74c', # takes width into account
#' stri_trans_nfkd('\ud6c8\ubbfc\uc815\uc74c'), 'abcd'),
#' width=10), sep='\n')
#'
#' @family length
#' @rdname stri_pad
#' @export
stri_pad_both <- function(str, width = floor(0.9 * getOption("width")), pad = " ",
use_length = FALSE)
{
.Call(C_stri_pad, str, width, 2L, pad, use_length)
}
#' @rdname stri_pad
#' @export
stri_pad_left <- function(str, width = floor(0.9 * getOption("width")), pad = " ",
use_length = FALSE)
{
.Call(C_stri_pad, str, width, 0L, pad, use_length)
}
#' @rdname stri_pad
#' @export
stri_pad_right <- function(str, width = floor(0.9 * getOption("width")), pad = " ",
use_length = FALSE)
{
.Call(C_stri_pad, str, width, 1L, pad, use_length)
}
#' @rdname stri_pad
#' @export
stri_pad <- function(str, width = floor(0.9 * getOption("width")), side = c("left",
"right", "both"), pad = " ", use_length = FALSE)
{
# `left` is the default for compatibility with stringr
side <- match.arg(side) # this is slow
switch(side,
both = stri_pad_both(str, width, pad, use_length),
left = stri_pad_left(str, width, pad, use_length),
right = stri_pad_right(str, width, pad, use_length))
}
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