injectHighlightHandler <- function() {
code <- "
Shiny.addCustomMessageHandler('highlight-code', function(message) {
var id = message['id'];
setTimeout(function() {
var el = document.getElementById(id);
hljs.highlightBlock(el);
}, 100);
});
"
tags$script(code)
}
includeHighlightJs <- function() {
resources <- system.file("www/shared/highlight", package = "shiny")
list(
includeScript(file.path(resources, "highlight.pack.js")),
includeCSS(file.path(resources, "rstudio.css")),
injectHighlightHandler()
)
}
highlightCode <- function(session, id) {
session$sendCustomMessage("highlight-code", list(id = id))
}
rCodeContainer <- function(...) {
code <- HTML(as.character(tags$code(class = "language-r", ...)))
div(pre(code))
}
renderCode <- function(expr, env = parent.frame(), quoted = FALSE) {
func <- NULL
installExprFunction(expr, "func", env, quoted)
markRenderFunction(textOutput, function() {
paste(func(), collapse = "\n")
})
}
stableColumnLayout <- function(...) {
dots <- list(...)
n <- length(dots)
width <- 12 / n
class <- sprintf("col-xs-%s col-md-%s", width, width)
shiny::fluidRow(
lapply(dots, function(el) {
htmltools::tags$div(class = class, el)
})
)
}
isErrorMessage <- function(object) {
inherits(object, "error_message")
}
errorMessage <- function(type, message) {
structure(
list(type = type, message = message),
class = "error_message"
)
}
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