R: File content analysis

extract.file.parse {inlinedocs} | R Documentation

## File content analysis

### Description

Using the base `parse` function, analyse the file to link preceding "prefix" comments to each active chunk. Those comments form the default description for that chunk. The analysis also looks for S4 class "setClass" calls and R.oo setConstructorS3 and setMethodS3 calls in order to link the documentation of those properly.

### Usage

    extract.file.parse(code)

### Arguments

`code` | Lines of R source code in a character vector - note that any nested `source` statements are ignored when scanning for class definitions.

### Details

If the definition chunk does not contain a description, any immediately preceding sequence consecutive "prefix" lines will be used instead.

Class and method definitions can take several forms, determined by expression type:

assignment (<-)

  Ordinary assignment of value/function;

setClass

  Definition of S4 class;

setConstructorS3

  Definition of S3 class using R.oo package;

setMethodS3

  Definition of method for S3 class using R.oo package.

Additionally, the value may be a name of a function defined elsewhere, in which case the documentation should be copied from that other definition. This is handled using the concept of documentation links.

The `setMethodS3` calls introduce additional complexity: they will define an additional S3 generic (which needs documentation to avoid warnings at package build time) unless one already exists. This also is handled by "linking" documentation. A previously unseen generic is linked to the first defining instances, subsequent definitions of that generic also link back to the first defining instance.

### Value

Returns an invisible list of .DocLink objects.

### Author(s)

Toby Dylan Hocking <toby@sg.cs.titech.ac.jp> [aut, cre], Keith Ponting [aut], Thomas Wutzler [aut], Philippe Grosjean [aut], Markus Müller [aut], R Core Team [ctb, cph]

[Package inlinedocs version 2013.9.3 Index]