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. Can be abbreviated. |
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 the
"keep.source"
option is 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. Horizontal tabs are converted to spaces.
- byte
As for
"column"
, but counting bytes, which may differ in case of multibyte characters (and horizontal tabs).- 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
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")