sourceutils {utils}R Documentation

Source Reference Utilities

Description

These functions extract information from source references.

Usage

getSrcFilename(x, full.names = FALSE, unique = TRUE)
getSrcDirectory(x, unique=TRUE) 
getSrcref(x)
getSrcLocation(x, which=c("line", "column", "byte", "parse"), first=TRUE)

Arguments

x An object (typically a function) containing source references.
full.names Whether to include the full path in the filename result.
unique Whether to list only unique filenames/directories.
which Which part of a source reference to extract.
first Whether to show the first (or last) location of the object.

Details

Each statement of a function will have its own source reference if options(keep.source=TRUE). These functions retrieve all of them.

The components are as follows:

line
The line number where the object starts or ends.
column
The column number where the object starts or ends.
byte
As for "column", but counting bytes, which may differ in case of multibyte characters.
parse
As for "line", but this ignores #line directives.

Value

getSrcFilename and getSrcDirectory return character vectors holding the filename/directory.

getSrcref returns a list of "srcref" objects or NULL if there are none.

getSrcLocation returns an integer vector of the requested type of locations.

See Also

srcref

Examples

fn <- function(x) {
  x + 1 # A comment, kept as part of the source
}			    

# Show the temporary file directory
# where the example was saved

getSrcDirectory(fn)  
getSrcLocation(fn, "line")

[Package utils version 2.13.0 Index]