read_xml: Read HTML or XML.

Description

Read HTML or XML.

Usage

read_xml(x, encoding = "", ..., as_html = FALSE, options = "NOBLANKS")
read_html(x, encoding = "", ..., options = c("RECOVER", "NOERROR",
  "NOBLANKS"))
# S3 method for character
read_xml(x, encoding = "", ..., as_html = FALSE,
  options = "NOBLANKS")
# S3 method for raw
read_xml(x, encoding = "", base_url = "", ...,
  as_html = FALSE, options = "NOBLANKS")
# S3 method for connection
read_xml(x, encoding = "", n = 64 * 1024,
  verbose = FALSE, ..., base_url = "", as_html = FALSE,
  options = "NOBLANKS")

Arguments

A string, a connection, or a raw vector.

A string can be either a path, a url or literal xml. Urls will be converted into connections either using base::url or, if installed, curl::curl. Local paths ending in .gz, .bz2, .xz, .zip will be automatically uncompressed.

If a connection, the complete connection is read into a raw vector before being parsed.

encoding

Specify a default encoding for the document. Unless otherwise specified XML documents are assumed to be in UTF-8 or UTF-16. If the document is not UTF-8/16, and lacks an explicit encoding directive, this allows you to supply a default.

...

Additional arguments passed on to methods.

as_html

Optionally parse an xml file as if it's html.

options

Set parsing options for the libxml2 parser. Zero of more of

RECOVER: recover on errors
NOENT: substitute entities
DTDLOAD: load the external subset
DTDATTR: default DTD attributes
DTDVALID: validate with the DTD
NOERROR: suppress error reports
NOWARNING: suppress warning reports
PEDANTIC: pedantic error reporting
NOBLANKS: remove blank nodes
SAX1: use the SAX1 interface internally
XINCLUDE: Implement XInclude substitition
NONET: Forbid network access
NODICT: Do not reuse the context dictionary
NSCLEAN: remove redundant namespaces declarations
NOCDATA: merge CDATA as text nodes
NOXINCNODE: do not generate XINCLUDE START/END nodes
COMPACT: compact small text nodes; no modification of the tree allowed afterwards (will possibly crash if you try to modify the tree)
OLD10: parse using XML-1.0 before update 5
NOBASEFIX: do not fixup XINCLUDE xml:base uris
HUGE: relax any hardcoded limit from the parser
OLDSAX: parse using SAX2 interface before 2.7.0
IGNORE_ENC: ignore internal document encoding hint
BIG_LINES: Store big lines numbers in text PSVI field

base_url

When loading from a connection, raw vector or literal html/xml, this allows you to specify a base url for the document. Base urls are used to turn relative urls into absolute urls.

If file is a connection, the number of bytes to read per iteration. Defaults to 64kb.

verbose

When reading from a slow connection, this prints some output on every iteration so you know its working.

Value

An XML document. HTML is normalised to valid XML - this may not be exactly the same transformation performed by the browser, but it's a reasonable approximation.

Examples

Run this code

# NOT RUN {
# Literal xml/html is useful for small examples
read_xml("<foo><bar /></foo>")
read_html("<html><title>Hi<title></html>")
read_html("<html><title>Hi")

# From a local path
read_html(system.file("extdata", "r-project.html", package = "xml2"))

# From a url
cd <- read_xml(xml2_example("cd_catalog.xml"))
me <- read_html("http://had.co.nz")
# }

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