R: Compute name of URL relative to a base URL

getRelativeURL {XML} | R Documentation

## Compute name of URL relative to a base URL

### Description

This function is a convenience function for computing the fullly qualified URI of a document relative to a base URL. It handles the case where the document is already fully qualified and so ignores the base URL or, alternatively, is a relative document name and so prepends the base URL. It does not (yet) try to be clever by collapsing relative directories such as "..".

### Usage

    getRelativeURL(u, baseURL, sep = "/", addBase = TRUE,
                   simplify = TRUE, escapeQuery = FALSE)

### Arguments

`u` | the location of the target document whose fully qualified URI is to be determined.
`baseURL` | the base URL relative to which the value of `u` should be interpreted.
`sep` | the separator to use to separate elements of the path. For external URLs (e.g. accessed via HTTP, HTTPS, FTP), / should be used. For local files on Windows machines one might use `.Platform$file.sep`, but this is incorrect unless one knows that the resulting file is to be accessed using Windows file system notation, i.e. `C:\\my\\folder\\file`.
`addBase` | a logical controlling whether we prepend the base URL to the result.
`simplify` | a logical value that controls whether we attempt to simplify/normalize the path to remove `..` and `.`
`escapeQuery` | a logical value. Currently ignored.

### Details

This uses the function `parseURI` to compute the components of the different URIs.

### Value

A character string giving the fully qualified URI for `u`.

### Author(s)

Duncan Temple Lang

### See Also

`parseURI` which uses the libxml2 facilities for parsing URIs.

`xmlParse`, `xmlTreeParse`, `xmlInternalTreeParse`. XInclude and XML Schema import/include elements for computing relative locations of included/imported files..

### Examples

     getRelativeURL("http://www.omegahat.net", "http://www.r-project.org")

     getRelativeURL("bar.html", "http://www.r-project.org/")

     getRelativeURL("../bar.html", "http://www.r-project.org/")

[Package XML version 3.99-0.3 Index]