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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.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1. Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
##
## 2. Redistributions in binary form must reproduce the above copyright notice,
## this list of conditions and the following disclaimer in the documentation
## and/or other materials provided with the distribution.
##
## 3. Neither the name of the copyright holder nor the names of its
## contributors may be used to endorse or promote products derived from
## this software without specific prior written permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
## BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
## FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
## PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
## OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
## WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
## OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
## EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#' @title
#' Count the Number of Pattern Occurrences
#'
#' @description
#' These functions count the number of occurrences
#' of a pattern in a string.
#'
#' @details
#' Vectorized over \code{str} and \code{pattern} (with recycling
#' of the elements in the shorter vector if necessary). This allows to,
#' for instance, search for one pattern in each given string,
#' search for each pattern in one given string,
#' and search for the i-th pattern within the i-th string.
#'
#' If \code{pattern} is empty, then the result is \code{NA}
#' and a warning is generated.
#'
#' \code{stri_count} is a convenience function.
#' It calls either \code{stri_count_regex},
#' \code{stri_count_fixed}, \code{stri_count_coll},
#' or \code{stri_count_charclass}, depending on the argument used.
#'
#' @param str character vector; strings to search in
#' @param pattern,regex,fixed,coll,charclass character vector;
#' search patterns; for more details refer to \link{stringi-search}
#' @param opts_collator,opts_fixed,opts_regex a named list used to tune up
#' the search engine's settings; see
#' \code{\link{stri_opts_collator}}, \code{\link{stri_opts_fixed}},
#' and \code{\link{stri_opts_regex}}, respectively; \code{NULL}
#' for the defaults
#' @param ... supplementary arguments passed to the underlying functions,
#' including additional settings for \code{opts_collator}, \code{opts_regex},
#' \code{opts_fixed}, and so on
#'
#' @return All the functions return an integer vector.
#'
#' @examples
#' s <- 'Lorem ipsum dolor sit amet, consectetur adipisicing elit.'
#' stri_count(s, fixed='dolor')
#' stri_count(s, regex='\\p{L}+')
#'
#' stri_count_fixed(s, ' ')
#' stri_count_fixed(s, 'o')
#' stri_count_fixed(s, 'it')
#' stri_count_fixed(s, letters)
#' stri_count_fixed('babab', 'b')
#' stri_count_fixed(c('stringi', '123'), 'string')
#'
#' stri_count_charclass(c('stRRRingi', 'STrrrINGI', '123'),
#' c('\\p{Ll}', '\\p{Lu}', '\\p{Zs}'))
#' stri_count_charclass(' \t\n', '\\p{WHITE_SPACE}') # white space - binary property
#' stri_count_charclass(' \t\n', '\\p{Z}') # white-space - general category (note the difference)
#'
#' stri_count_regex(s, '(s|el)it')
#' stri_count_regex(s, 'i.i')
#' stri_count_regex(s, '.it')
#' stri_count_regex('bab baab baaab', c('b.*?b', 'b.b'))
#' stri_count_regex(c('stringi', '123'), '^(s|1)')
#'
#' @family search_count
#' @export
#' @rdname stri_count
stri_count <- function(str, ..., regex, fixed, coll, charclass)
{
providedarg <- c(
regex = !missing(regex),
fixed = !missing(fixed),
coll = !missing(coll),
charclass = !missing(charclass))
if (sum(providedarg) != 1)
stop("you have to specify either `regex`, `fixed`, `coll`, or `charclass`")
if (providedarg["regex"])
stri_count_regex(str, regex, ...)
else if (providedarg["fixed"])
stri_count_fixed(str, fixed, ...)
else if (providedarg["coll"])
stri_count_coll(str, coll, ...)
else if (providedarg["charclass"])
stri_count_charclass(str, charclass, ...)
}
#' @export
#' @rdname stri_count
stri_count_charclass <- function(str, pattern) {
.Call(C_stri_count_charclass, str, pattern)
}
#' @export
#' @rdname stri_count
stri_count_coll <- function(str, pattern, ..., opts_collator = NULL)
{
if (!missing(...))
opts_collator <- do.call(stri_opts_collator, as.list(c(opts_collator, ...)))
.Call(C_stri_count_coll, str, pattern, opts_collator)
}
#' @export
#' @rdname stri_count
stri_count_fixed <- function(str, pattern, ..., opts_fixed = NULL)
{
if (!missing(...))
opts_fixed <- do.call(stri_opts_fixed, as.list(c(opts_fixed, ...)))
.Call(C_stri_count_fixed, str, pattern, opts_fixed)
}
#' @export
#' @rdname stri_count
stri_count_regex <- function(str, pattern, ..., opts_regex = NULL)
{
if (!missing(...))
opts_regex <- do.call(stri_opts_regex, as.list(c(opts_regex, ...)))
.Call(C_stri_count_regex, str, pattern, opts_regex)
}
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