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eb9f5f9025
1) Give bootstrap deps a path so they can be used in static docs 2) Resolve dependencies before rendering page (whoops)
134 lines
4.0 KiB
R
134 lines
4.0 KiB
R
#' @include globals.R
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NULL
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#' Load the MathJax library and typeset math expressions
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#'
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#' This function adds MathJax to the page and typeset the math expressions (if
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#' found) in the content \code{...}. It only needs to be called once in an app
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#' unless the content is rendered \emph{after} the page is loaded, e.g. via
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#' \code{\link{renderUI}}, in which case we have to call it explicitly every
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#' time we write math expressions to the output.
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#' @param ... any HTML elements to apply MathJax to
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#' @export
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#' @examples withMathJax(helpText("Some math here $$\\alpha+\\beta$$"))
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#' # now we can just write "static" content without withMathJax()
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#' div("more math here $$\\sqrt{2}$$")
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withMathJax <- function(...) {
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path <- 'https://c328740.ssl.cf1.rackcdn.com/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
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tagList(
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tags$head(
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singleton(tags$script(src = path, type = 'text/javascript'))
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),
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...,
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tags$script(HTML('MathJax.Hub.Queue(["Typeset", MathJax.Hub]);'))
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)
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}
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renderPage <- function(ui, connection, showcase=0) {
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if (showcase > 0)
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ui <- tagList(tags$head(showcaseHead()), ui)
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result <- renderTags(ui)
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deps <- c(
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list(
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htmlDependency("jquery", "1.11.0", c(href="shared"), script = "jquery.js"),
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htmlDependency("shiny", packageVersion("shiny"), c(href="shared"),
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script = "shiny.js", stylesheet = "shiny.css")
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),
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result$dependencies
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)
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deps <- resolveDependencies(deps)
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deps <- lapply(deps, createWebDependency)
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depStr <- paste(sapply(deps, function(dep) {
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sprintf("%s[%s]", dep$name, dep$version)
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}), collapse = ";")
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depHtml <- renderDependencies(deps, "href")
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# write preamble
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writeLines(c('<!DOCTYPE html>',
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'<html>',
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'<head>',
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' <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>',
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sprintf(' <script type="application/shiny-singletons">%s</script>',
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paste(result$singletons, collapse = ',')
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),
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sprintf(' <script type="application/html-dependencies">%s</script>',
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depStr
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),
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depHtml
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),
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con = connection)
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writeLines(c(result$head,
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'</head>',
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'<body>',
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recursive=TRUE),
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con = connection)
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if (showcase > 0) {
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# in showcase mode, emit containing elements and app HTML
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writeLines(as.character(showcaseBody(result$html)),
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con = connection)
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} else {
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# in normal mode, write UI html directly to connection
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writeLines(result$html, con = connection)
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}
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# write end document
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writeLines(c('</body>',
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'</html>'),
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con = connection)
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}
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#' Create a Shiny UI handler
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#'
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#' Historically this function was used in ui.R files to register a user
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#' interface with Shiny. It is no longer required; simply ensure that the last
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#' expression to be returned from ui.R is a user interface. This function is
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#' kept for backwards compatibility with older applications. It returns the
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#' value that is passed to it.
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#'
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#' @param ui A user interace definition
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#' @return The user interface definition, without modifications or side effects.
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#'
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#' @export
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shinyUI <- function(ui) {
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.globals$ui <- list(ui)
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ui
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}
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uiHttpHandler <- function(ui, path = "/") {
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force(ui)
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function(req) {
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if (!identical(req$REQUEST_METHOD, 'GET'))
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return(NULL)
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if (req$PATH_INFO != path)
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return(NULL)
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textConn <- textConnection(NULL, "w")
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on.exit(close(textConn))
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showcaseMode <- .globals$showcaseDefault
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if (.globals$showcaseOverride) {
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mode <- showcaseModeOfReq(req)
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if (!is.null(mode))
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showcaseMode <- mode
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}
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uiValue <- if (is.function(ui)) {
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if (length(formals(ui)) > 0)
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ui(req)
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else
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ui()
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}
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else
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ui
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renderPage(uiValue, textConn, showcaseMode)
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html <- paste(textConnectionValue(textConn), collapse='\n')
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return(httpResponse(200, content=html))
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}
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}
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