Nothing
#' Gets a list of IDs of transcripts that match a particular pattern.
#'
#' Gets a list of IDs of transcripts (i.e. transcript names) that match a
#' particular pattern.
#'
#' The results can be exhaustive, by omitting page.length and
#' page.number, or they can be a subset (a 'page') of results, by
#' given page.length and page.number values.
#'
#' The order of the list can be specified. If ommitted, the transcripts
#' are listed in ID order.
#'
#' The expression language is currently not well defined, but is based on JavaScript
#' syntax.
#'
#' \itemize{
#' \item{The \emph{labels} function can be used to represent a list of all the annotation
#' labels on a given layer. For example, each transcript can have multiple
#' participants, so the participant labels (names) are represented by:
#' \emph{labels('participant')}}
#' \item{Use the \emph{includes} function on a list to test whether the list contains a
#' given element. e.g. to match transcripts that include the participant 'Joe' use:
#' \emph{labels('participant').includes('Joe')}}
#' \item{Use the \emph{first} function to identify the first (or the only) annotation on
#' a given layer. e.g. the annotation representing the transcript's corpus is:
#' \emph{first('corpus')}}
#' \item{Single annotations have various attributes, including 'id', 'label', 'ordinal', etc.
#' e.g. the name of the transcript's corpus is:
#' \emph{first('corpus').label}}
#' \item{Regular expressions can be matched by using expressions like
#' '/regex/.test(str)', e.g. to test if the ID starts with 'BR' use:
#' \emph{/^BR.+/.test(id)}
#' or to test if the transcript's corpus includes a B use:
#' \emph{/.*B.*/.test(first('corpus').label)}}
#' }
#'
#' Expressions such as those in the examples can be used.
#'
#' @param labbcat.url URL to the LaBB-CAT instance
#' @param expression An expression that determines which transcripts match
#' @param page.length The maximum number of IDs to return, or null to return all
#' @param page.number The zero-based page number to return, or null to return the first page
#' @param order An expression that determines the order the transcripts are
#' listed in - if specified, this must include the keyword 'ASC' for ascending or 'DESC'
#' for descending order.
#' @return A list of transcript IDs (i.e. transcript names)
#'
#' @examples
#' \dontrun{
#' ## define the LaBB-CAT URL
#' labbcat.url <- "https://labbcat.canterbury.ac.nz/demo/"
#'
#' ## Get all transcripts whose names start with "BR"
#' transcripts <- getMatchingTranscriptIds(labbcat.url, "/^BR.+/.test(id)")
#'
#' ## Get the first twenty transcripts in the "QB" corpus
#' transcripts <- getMatchingTranscriptIds(
#' labbcat.url, "first('corpus').label = 'QB'", 20, 0)
#'
#' ## Get the second transcript that has "QB247_Jacqui" as a speaker
#' transcripts <- getMatchingTranscriptIds(
#' labbcat.url, "labels('participant').includes('QB247_Jacqui')", 1, 1)
#'
#' ## Get all transcripts in the QB corpus whose names start with "BR"
#' ## in word-count order
#' transcripts <- getMatchingTranscriptIds(
#' labbcat.url, "first('corpus').label = 'QB' && /^BR.+/.test(id)",
#' order="first('transcript_word_count').label ASC")
#' }
#'
#' @keywords transcript expression
#'
getMatchingTranscriptIds <- function(labbcat.url, expression, page.length = NULL, page.number = NULL, order = NULL) {
parameters <- list(expression=expression)
if (!is.null(page.length)) parameters <- append(parameters, list(pageLength=page.length))
if (!is.null(page.number)) parameters <- append(parameters, list(pageNumber=page.number))
if (!is.null(order)) parameters <- append(parameters, list(order=order))
resp <- store.get(labbcat.url, "getMatchingTranscriptIds", 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)
}
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.