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xmlErrorCumulator =
function(class = "XMLParserErrorList", immediate = TRUE)
{
messages = character()
function(msg, ...) {
# curently discards all the extra information.
if(length(grep("\\\n$", msg)) == 0)
paste(msg, "\n", sep = "")
if(immediate)
cat(msg)
if(length(msg) == 0) {
# collapse into string. Probably want to leave as separate elements of a character vector.
# Make into real objects with the ... information.
e = simpleError(paste(1:length(messages), messages, sep = ": ",collapse = ""))
class(e) = c(class, class(e))
stop(e)
}
messages <<- c(messages, msg)
}
}
xmlStop =
#
# Never used anymore.
# Related to the non-structed error handling.
function(msg, class = "XMLParserError")
{
err = simpleError(msg)
class(err) = c(class , class(err))
stop(err)
}
makeXMLError =
function(msg, code, domain, line, col, level, filename, class = "XMLError")
{
err = simpleError(msg)
err$code = getEnumValue(code, xmlParserErrors)
err$domain = getEnumValue(domain, xmlErrorDomain)
err$line = line
err$col = col
err$level = getEnumValue(level, xmlErrorLevel)
err$filename = filename
class(err) = c(class, class(err))
err
}
htmlErrorHandler =
function(msg, code, domain, line, col, level, filename, class = "XMLError")
{
e = makeXMLError(msg, code, domain, line, col, level, filename, class)
dom = names(e$domain)
class(e) = c(names(e$code),
sprintf("%s_Error", gsub("_FROM_", "_", dom)),
class(e))
if(e$code == xmlParserErrors["XML_IO_LOAD_ERROR"])
stop(e)
}
xmlStructuredStop =
function(msg, code, domain, line, col, level, filename, class = "XMLError")
{
err = makeXMLError(msg, code, domain, line, col, level, filename, class)
stop(err)
}
xmlErrorFun =
function()
{
errors = list()
h = function(msg, code, domain, line, col, level, filename) {
if(length(msg) == 0)
return(TRUE)
err = list(msg = msg, code = code,
domain = domain, line = line,
col = col, level = level, filename = filename)
err = fixXMLError(err)
errors[[length(errors) + 1]] <<- err
}
structure(list(handler = h, errors = function() structure(errors, class = "XMLStructuredErrorList"), reset = function() errors <<- list),
class = "XMLStructuredErrorCumulator")
}
setOldClass("XMLStructuredErrorList")
print.XMLStructuredErrorList =
function(x, ...) {
if(length(x) == 0)
print(NULL)
else
print(t(sapply(x, function(x) unlist(x[c("line", "msg")]))))
}
getXMLErrors=
#
# This attempts to read the specified file using the function given in parse
# and then returns a list of the errors in the document.
# This a somewhat convenient mechanism for fixing up, e.g., malformed HTML
# pages or other XML documents.
function(filename, parse = xmlParse, ...)
{
f = xmlErrorFun()
opts = options()
options(error = NULL)
on.exit(options(opts))
tryCatch(parse(filename, ..., error = f$handler), error = function(e){})
f$errors()
}
# Low level error handler
setXMLErrorHandler =
function(fun)
{
prev = .Call("RS_XML_getStructuredErrorHandler", PACKAGE = "XML")
sym = getNativeSymbolInfo("R_xmlStructuredErrorHandler", "XML")$address
.Call("RS_XML_setStructuredErrorHandler", list(fun, sym), PACKAGE = "XML")
prev
}
fixXMLError =
function(err)
{
err$domain = getEnumValue(err$domain, xmlErrorDomain)
err$code = getEnumValue(err$code, xmlParserErrors)
err$level = getEnumValue(err$level, xmlErrorLevel)
class(err) = "XMLError"
err
}
getEnumValue =
function(value, defs)
{
# might use for the class.
name = substitute(defs)
i = which(value == defs)
defs[i]
}
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