R: Source Reference Utilities

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 2.15.1 Index]