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isURL =
function(file)
{
is.character(file) && grepl("^(http|ftp)", file)
}
############
#XXXXXXXXX
# This is now replaced by copying xmlTreeParse.
htmlTreeParse <-
#
# HTML parser that reads the entire `document' tree into memory
# and then converts it to an R/S object.
# Uses the libxml from Daniel Veillard at W3.org.
#
# asText treat the value of file as XML text, not the name of a file containing
# the XML text, and parse that.
# See also xml
#
function(file, ignoreBlanks = TRUE, handlers = NULL,
replaceEntities = FALSE, asText = inherits(file, "AsIs") || !isURL && grepl("^<", file), # could have a BOM
trim = TRUE,
isURL = is.character(file) && grepl("^(http|ftp)", file),
asTree = FALSE, useInternalNodes = FALSE,
encoding = character(),
useDotNames = length(grep("^\\.", names(handlers))) > 0,
xinclude = FALSE, addFinalizer = TRUE, error = function(...){},
options = integer(), parentFirst = FALSE)
{
if(TRUE)
{
doc = xmlTreeParse(file, ignoreBlanks, handlers, replaceEntities, asText, trim, validate = FALSE,
getDTD = FALSE, isURL, asTree, addAttributeNamespaces = FALSE,
useInternalNodes, isSchema = FALSE, fullNamespaceInfo = FALSE,
encoding, useDotNames, xinclude, addFinalizer, error, isHTML = TRUE, options = options)
class(doc) = c("HTMLInternalDocument", class(doc)[1])
return(doc)
}
if(length(file) > 1) {
file = paste(file, collapse = "\n")
if(!missing(asText) && !asText)
stop("multiple URIs passed to xmlTreeParse. If this is the content of the file, specify asText = TRUE")
asText = TRUE
}
if(missing(asText) && substring(file, 1, 1) == "<")
asText = TRUE
if(!asText && missing(isURL)) {
isURL <- length(grep("^(http|ftp)://", file, useBytes = TRUE, perl = TRUE))
}
# check whether we are treating the file name as
# a) the XML text itself, or b) as a URL.
# Otherwise, check if the file exists and report an error.
if(asText == FALSE && isURL == FALSE) {
if(file.exists(file) == FALSE)
stop(paste("File", file, "does not exist "))
}
if(!asText && !isURL)
file = path.expand(file)
old = setEntitySubstitution(replaceEntities)
on.exit(setEntitySubstitution(old))
if(!is.logical(xinclude)) {
if(inherits(xinclude, "numeric"))
xinclude = bitlist(xinclude)
else
xinclude = as.logical(xinclude)
}
.oldErrorHandler = setXMLErrorHandler(error)
on.exit(.Call("RS_XML_setStructuredErrorHandler", .oldErrorHandler, PACKAGE = "XML"), add = TRUE)
ans <- .Call("RS_XML_ParseTree", as.character(file), handlers,
as.logical(ignoreBlanks), as.logical(replaceEntities),
as.logical(asText), as.logical(trim),
FALSE, FALSE,
as.logical(isURL), FALSE,
as.logical(useInternalNodes), TRUE, FALSE, FALSE, as.character(encoding),
as.logical(useDotNames), xinclude, error, addFinalizer, options, as.logical(parentFirst), PACKAGE = "XML")
if(!missing(handlers) & !as.logical(asTree))
return(handlers)
if(inherits(ans, "XMLInternalDocument")) {
addDocFinalizer(ans, addFinalizer)
class(ans) = c("HTMLInternalDocument", class(ans))
}
ans
}
#XXXXXX
# This is another version that doesn't seem to release the document. Weird. I can't seem to find
# out who is holding onto it.
myHTMLParse =
function(file, ignoreBlanks = TRUE, handlers = NULL,
replaceEntities = FALSE, asText = inherits(file, "AsIs") || !isURL && grepl("^<", file), # could have a BOM
trim = TRUE,
isURL = is.character(file) && grepl("^(http|ftp)", file),
asTree = FALSE, useInternalNodes = FALSE,
encoding = character(),
useDotNames = length(grep("^\\.", names(handlers))) > 0,
xinclude = FALSE, addFinalizer = TRUE, error = function(...){})
{
doc = xmlTreeParse(file, ignoreBlanks, handlers, replaceEntities, asText, trim, validate = FALSE,
getDTD = FALSE, isURL, asTree, addAttributeNamespaces = FALSE,
useInternalNodes, isSchema = FALSE, fullNamespaceInfo = FALSE,
encoding, useDotNames, xinclude, addFinalizer, error, isHTML = TRUE)
class(doc) = c("HTMLInternalDocument", class(doc)[2])
return(doc)
}
hideParseErrors = function (...) NULL
htmlTreeParse = xmlTreeParse
formals(htmlTreeParse)$error = as.name("htmlErrorHandler") # as.name("hideParseErrors")
formals(htmlTreeParse)$isHTML = TRUE
htmlParse = htmlTreeParse
formals(htmlParse)$useInternalNodes = TRUE
parseURI =
function(uri)
{
if(is.na(uri))
return(structure(as.character(uri), class = "URI"))
u = .Call("R_parseURI", as.character(uri), PACKAGE = "XML")
if(u$port == 0)
u$port = as.integer(NA)
class(u) = "URI"
u
}
setOldClass("URI")
setOldClass("URL")
setAs("URI", "character",
function(from) {
if(from$scheme == "")
sprintf("%s%s%s",
from["path"],
if(from[["query"]] != "") sprintf("?%s", from[["query"]]) else "",
if(from[["fragment"]] != "") sprintf("#%s", from[["fragment"]]) else "" )
else
sprintf("%s://%s%s%s%s%s%s%s",
from[["scheme"]],
from[["user"]],
if(from[["user"]] != "") "@" else "",
from[["server"]],
if(!is.na(from[["port"]])) sprintf(":%d", as.integer(from[["port"]])) else "",
from["path"],
if(from[["query"]] != "") sprintf("?%s", from[["query"]]) else "",
if(from[["fragment"]] != "") sprintf("#%s", from[["fragment"]]) else ""
)
})
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