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#' @include globals.R
NULL
#' Load the MathJax library and typeset math expressions
#'
#' This function adds MathJax to the page and typeset the math expressions (if
#' found) in the content \code{...}. It only needs to be called once in an app
#' unless the content is rendered \emph{after} the page is loaded, e.g. via
#' \code{\link{renderUI}}, in which case we have to call it explicitly every
#' time we write math expressions to the output.
#' @param ... any HTML elements to apply MathJax to
#' @export
#' @examples withMathJax(helpText("Some math here $$\\alpha+\\beta$$"))
#' # now we can just write "static" content without withMathJax()
#' div("more math here $$\\sqrt{2}$$")
withMathJax <- function(...) {
path <- 'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
tagList(
tags$head(
singleton(tags$script(src = path, type = 'text/javascript'))
),
...,
tags$script(HTML('if (window.MathJax) MathJax.Hub.Queue(["Typeset", MathJax.Hub]);'))
)
}
renderPage <- function(ui, connection, showcase=0, testMode=FALSE) {
# If the ui is a NOT complete document (created by htmlTemplate()), then do some
# preprocessing and make sure it's a complete document.
if (!inherits(ui, "html_document")) {
if (showcase > 0)
ui <- showcaseUI(ui)
# Wrap ui in body tag if it doesn't already have a single top-level body tag.
if (!(inherits(ui, "shiny.tag") && ui$name == "body"))
ui <- tags$body(ui)
# Put the body into the default template
ui <- htmlTemplate(
system.file("template", "default.html", package = "shiny"),
body = ui
)
}
shiny_deps <- list(
htmlDependency("json2", "2014.02.04", c(href="shared"), script = "json2-min.js"),
htmlDependency("jquery", "1.12.4", c(href="shared"), script = "jquery.min.js"),
htmlDependency("babel-polyfill", "6.7.2", c(href="shared"), script = "babel-polyfill.min.js"),
htmlDependency("shiny", utils::packageVersion("shiny"), c(href="shared"),
script = if (getOption("shiny.minified", TRUE)) "shiny.min.js" else "shiny.js",
stylesheet = "shiny.css")
)
if (testMode) {
# Add code injection listener if in test mode
shiny_deps[[length(shiny_deps) + 1]] <-
htmlDependency("shiny-testmode", utils::packageVersion("shiny"),
c(href="shared"), script = "shiny-testmode.js")
}
html <- renderDocument(ui, shiny_deps, processDep = createWebDependency)
writeUTF8(html, con = connection)
}
#' Create a Shiny UI handler
#'
#' Historically this function was used in ui.R files to register a user
#' interface with Shiny. It is no longer required as of Shiny 0.10; simply
#' ensure that the last expression to be returned from ui.R is a user interface.
#' This function is kept for backwards compatibility with older applications. It
#' returns the value that is passed to it.
#'
#' @param ui A user interace definition
#' @return The user interface definition, without modifications or side effects.
#' @export
shinyUI <- function(ui) {
.globals$ui <- list(ui)
ui
}
uiHttpHandler <- function(ui, uiPattern = "^/$") {
force(ui)
function(req) {
if (!identical(req$REQUEST_METHOD, 'GET'))
return(NULL)
if (!isTRUE(grepl(uiPattern, req$PATH_INFO)))
return(NULL)
textConn <- file(open = "w+")
on.exit(close(textConn))
showcaseMode <- .globals$showcaseDefault
if (.globals$showcaseOverride) {
mode <- showcaseModeOfReq(req)
if (!is.null(mode))
showcaseMode <- mode
}
testMode <- .globals$testMode %OR% FALSE
# Create a restore context using query string
bookmarkStore <- getShinyOption("bookmarkStore", default = "disable")
if (bookmarkStore == "disable") {
# If bookmarking is disabled, use empty context
restoreContext <- RestoreContext$new()
} else {
restoreContext <- RestoreContext$new(req$QUERY_STRING)
}
withRestoreContext(restoreContext, {
uiValue <- NULL
if (is.function(ui)) {
if (length(formals(ui)) > 0) {
# No corresponding ..stacktraceoff.., this is pure user code
uiValue <- ..stacktraceon..(ui(req))
} else {
# No corresponding ..stacktraceoff.., this is pure user code
uiValue <- ..stacktraceon..(ui())
}
} else {
if (getCurrentRestoreContext()$active) {
warning("Trying to restore saved app state, but UI code must be a function for this to work! See ?enableBookmarking")
}
uiValue <- ui
}
})
if (is.null(uiValue))
return(NULL)
renderPage(uiValue, textConn, showcaseMode, testMode)
html <- paste(readLines(textConn, encoding = 'UTF-8'), collapse='\n')
return(httpResponse(200, content=enc2utf8(html)))
}
}
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