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#' Gets the number of annotations matching a particular pattern.
#'
#' Returns the number of annotations in the corpus that match the given expression.
#'
#'
#' @param labbcat.url URL to the LaBB-CAT instance
#' @param expression An expression that determines which annotations match. This must
#' match by either id or layer.id.
#' The expression language is currently not well defined, but is based on JavaScript
#' syntax. e.g.
#'
#' \itemize{
#' \item{id == 'ew_0_456'}
#' \item{['ew_2_456', 'ew_2_789', 'ew_2_101112'].includes(id)}
#' \item{layerId == 'orthography' && !/th[aeiou].+/.test(label)}
#' \item{graph.id == 'AdaAicheson-01.trs' && layer.id == 'orthography' &&
#' start.offset > 10.5}
#' \item{layer.id == 'utterance' && all('word').includes('ew_0_456')}
#' \item{layerId = 'utterance' && labels('orthography').includes('foo')}
#' \item{layerId = 'utterance' && labels('participant').includes('Ada')}
#' }
#'
#' @return The number of annotations that match the expression.
#'
#' @seealso
#' \code{\link{getMatchingAnnotations}}
#' @examples
#' \dontrun{
#' ## define the LaBB-CAT URL
#' labbcat.url <- "https://labbcat.canterbury.ac.nz/demo/"
#'
#' ## count the number of topic tags that include the word 'quake'
#' countMatchingAnnotations(labbcat.url, "layer.id == 'topic' && /.*quake.*/.test(label)")
#' }
#'
#' @keywords annotation expression
#'
countMatchingAnnotations <- function(labbcat.url, expression) {
parameters <- list(expression=expression)
resp <- store.get(labbcat.url, "countMatchingAnnotations", parameters)
if (is.null(resp)) return()
resp.content <- httr::content(resp, as="text", encoding="UTF-8")
if (httr::status_code(resp) != 200) { # 200 = OK
print(paste("ERROR: ", httr::http_status(resp)$message))
print(resp.content)
return()
}
resp.json <- jsonlite::fromJSON(resp.content)
for (error in resp.json$errors) print(error)
return(resp.json$model)
}
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