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extensionToIMT <- function(filename, ext=NULL, default=NA) {
if (is.null(ext)) {
# If URI, drop any URI arguments
if (isUrl(filename)) {
filename <- splitUrl(filename)$path
}
ext <- gsub(".*[.]([^.]+)$", "\\1", filename)
}
ext <- tolower(ext)
type <- switch(ext,
"asciidoc" = "application/x-asciidoc",
"atom" = "application/atom+xml",
"brew" = "application/x-brew",
"css" = "text/css",
"csv" = "text/csv",
"deb" = "application/x-deb",
"dtd" = "application/xml-dtd",
"htm" = "text/html",
"html" = "text/html",
"js" = "application/javascript",
"json" = "application/json",
"kml" = "application/vnd.google-earth.kml+xml",
"ltx" = "application/x-latex", # To allow static LaTeX vignettes
"md" = "application/x-markdown",
"pdf" = "application/pdf",
"ps" = "application/postscript",
"r" = "application/R",
"rdf" = "application/rdf+xml",
"rhtml" = "application/x-rhtml",
"rmd" = "application/x-rmd",
"rnw" = "application/x-rnw",
"rrst" = "application/x-rrst",
"rsp" = "application/x-rsp",
"rss" = "application/rss+xml",
"rtex" = "application/x-rtex",
"svg" = "image/svg+xml",
"tex" = "application/x-latex",
"txt" = "text/plain",
"vcard" = "text/vcard",
"vcf" = "text/vcard",
"vrml" = "model/vrml",
"xhtml" = "application/xhtml+xml",
"xml" = "text/xml", # also "application/xml"
"xul" = "application/application/vnd.mozilla.xul+xml",
default
)
type
} # extensionToIMT()
escapeRspTags <- function(s) {
s <- gsub(.rspBracketOpen, .rspBracketOpenEscape, s, fixed=TRUE)
s <- gsub(.rspBracketClose, .rspBracketCloseEscape, s, fixed=TRUE)
s
} # escapeRspTags()
unescapeRspTags <- function(s) {
s <- gsub(.rspBracketOpenEscape, .rspBracketOpen, s, fixed=TRUE)
s <- gsub(.rspBracketCloseEscape, .rspBracketClose, s, fixed=TRUE)
s
} # unescapeRspTags()
escapeRspContent <- function(s, srcCT, targetCT, verbose=FALSE) {
ct <- list(src=srcCT, target=targetCT)
if (!is.list(ct$src)) {
ct$src <- parseInternetMediaType(ct$src)
}
if (!is.list(ct$target)) {
ct$target <- parseInternetMediaType(ct$target)
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# (1a) Validate the source content type
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
knownSourceTypes <- c("text/plain", "application/x-rsp", "application/x-latex", "application/x-tex")
if (!is.element(ct$src$contentType, knownSourceTypes)) {
msg <- sprintf("Source content type '%s' is unknown. Will use 'text/plain' for escaping.", ct$src$contentType)
warning(msg)
verbose && cat(verbose, msg)
ct$src <- parseInternetMediaType("text/plain")
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# (1b) Validate the target content type
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
knownTargetTypes <- c("text/plain", "application/x-latex", "application/x-tex")
if (!is.element(ct$target$contentType, knownTargetTypes)) {
msg <- sprintf("Target content type '%s' is unknown. Will use 'text/plain' for escaping.", ct$target$contentType)
warning(msg)
verbose && cat(verbose, msg)
ct$target <- parseInternetMediaType("text/plain")
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# (2) "Merge" content types with the same escape rules
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
for (key in names(ct)) {
type <- ct[[key]]$contentType
type <- sub("application/x-latex", "application/x-tex", type)
ct[[key]]$contentType <- type
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# (3) Escape text from source to target content type
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
srcArgs <- ct$src$args
srcArgsS <- paste(paste(names(srcArgs), srcArgs, sep="="), collapse=" ")
targetArgs <- ct$target$args
targetArgsS <- paste(paste(names(targetArgs), targetArgs, sep="="), collapse=" ")
verbose && printf(verbose, "Translating content of type '%s' (%s) into type '%s' (%s).\n", ct$src$contentType, srcArgsS, ct$target$contentType, targetArgsS)
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# 'text/plain' -> ...
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if (ct$src$contentType == "text/plain") {
if (ct$target$contentType == "text/plain") {
s <- escapeRspTags(s)
} else if (ct$target$contentType == "application/x-tex") {
env <- ct$src$args["environment"]
if (is.null(env) || is.na(env)) env <- ""
env <- unlist(strsplit(env, split=",", fixed=TRUE), use.names=FALSE)
env <- trim(env)
if (is.element("math", env)) {
}
replace <- c("\\"="\\textbackslash", "{"="\\{", "}"="\\}",
"&"="\\&", "%"="\\%", "$"="\\$", "#"="\\#",
"_"="\\_",
"~"="\\~{}", "^"="\\^{}"); # <== ?
search <- names(replace)
for (ii in seq_along(replace)) {
s <- gsub(search[ii], replace[ii], s, fixed=TRUE)
}
}
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# 'application/x-rsp' -> ...
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if (ct$src$contentType == "application/x-rsp") {
escaped <- identical(unname(ct$src$args["escaped"]), "TRUE")
if (escaped) {
s <- unescapeRspTags(s)
}
if (ct$target$contentType == "text/plain") {
} else if (ct$target$contentType == "application/x-tex") {
}
}
as.character(s)
} # escapeRspContent()
# \references{
# [1] \emph{Internet Media Type},
# \url{https://www.wikipedia.org/wiki/Internet_media_type}
# }
parseInternetMediaType <- function(s, ...) {
# Nothing to do?
if (is.na(s)) {
return(s)
}
# Example e.g. "text/html; charset=UTF-8"
s <- trim(s)
pattern <- "^([^/]*)/([^;]*)(|;[ ]*(.*))$"
if (regexpr(pattern, s) == -1L) {
throw("Syntax error: Not an internet media type: ", sQuote(s))
}
# Extract: <type>/<subtype>
type <- gsub(pattern, "\\1", s)
subtype <- gsub(pattern, "\\2", s)
# Extract: <name>=<value>*
argsS <- gsub(pattern, "\\4", s)
patternS <- "^([^=]*)=([^ ]*)(.*)"
args <- NULL
while(nchar(argsS <- trim(argsS)) > 0L) {
if (regexpr(patternS, argsS) == -1L) {
throw("Syntax error: Invalid internet media type argument: ", sQuote(argsS))
}
name <- gsub(patternS, "\\1", argsS)
value <- gsub(patternS, "\\2", argsS)
names(value) <- name
args <- c(args, value)
argsS <- gsub(patternS, "\\3", argsS)
}
list(
contentType=sprintf("%s/%s", type, subtype),
type=type,
subtype=subtype,
args=args
)
} # parseInternetMediaType()
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