Check an Rd Object



Check an help file or the output of the parse_Rd function.


checkRd(Rd, defines = .Platform$OS.type, stages = "render",
        unknownOK = TRUE, listOK = TRUE, ..., def_enc = FALSE)



a filename or Rd object to use as input.


string(s) to use in #ifdef tests.


at which stage ("build", "install", or "render") should \Sexpr macros be executed? See the notes below.


unrecognized macros are treated as errors if FALSE, otherwise warnings.


unnecessary non-empty braces (e.g., around text, not as an argument) are treated as errors if FALSE, otherwise warnings.


additional parameters to pass to parse_Rd when Rd is a filename. One that is often useful is encoding.


logical: has the package declared an encoding, so tests for non-ASCII text are suppressed?


checkRd performs consistency checks on an Rd file, confirming that required sections are present, etc.

It accepts a filename for an Rd file, and will use parse_Rd to parse it before applying the checks. If so, warnings from parse_Rd are collected, together with those from the internal function prepare_Rd, which does the #ifdef and \Sexpr processing, drops sections that would not be rendered or are duplicated (and should not be) and removes empty sections.

An Rd object is passed through prepare_Rd, but it may already have been (and installed Rd objects have).

Warnings are given a ‘level’: those from prepare_Rd have level 0. These include

All text must be in a section
Only one tag name section is allowed: the first will be used
Section name is unrecognized and will be dropped
Dropping empty section name

checkRd itself can show

7 Tag tag name not recognized
7 \tabular format must be simple text
7 Unrecognized \tabular format: ...
7 Only n columns allowed in this table
7 Must have a tag name
7 Only one tag name is allowed
7 Tag tag name must not be empty
7 \docType must be plain text
5 Tag \method is only valid in \usage
5 Tag \dontrun is only valid in \examples
5 Tag tag name is invalid in a block name block
5 Title of \section must be non-empty plain text
5 \title content must be plain text
3 Empty section tag name
-1 Non-ASCII contents without declared encoding
-1 Non-ASCII contents in second part of \enc
-3 Tag \ldots is not valid in a code block
-3 Apparent non-ASCII contents without declared encoding
-3 Apparent non-ASCII contents in second part of \enc
-3 Unnecessary braces at ...
-3 \method not valid outside a code block

and variations with \method replaced by \S3method or \S4method.

Note that both prepare_Rd and checkRd have tests for an empty section: that in checkRd is stricter (essentially that nothing is output).


This may fail through an R error, but otherwise warnings are collected as returned as an object of class "checkRd", a character vector of messages. This class has a print method which only prints unique messages, and has argument minlevel that can be used to select only more serious messages. (This is set to -1 in R CMD check.)

Possible fatal errors are those from running the parser (e.g., a non-existent file, unclosed quoted string, non-ASCII input without a specified encoding) or from prepare_Rd (multiple \Rdversion declarations, invalid \encoding or \docType or \name sections, and missing or duplicate \name or \title sections).


Duncan Murdoch, Brian Ripley

See Also

parse_Rd, Rd2HTML.

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