Scheme 48 Manual -- SRFIs

Scheme 48 Manual | Contents | In Chapter: Libraries
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SRFIs

`SRFI' stands for `Scheme Request For Implementation'. An SRFI is a description of an extension to standard Scheme. Draft and final SRFI documents, a FAQ, and other information about SRFIs can be found at the SRFI web site.

Scheme 48 includes implementations of the following (final) SRFIs:

SRFI 1 - List Library
SRFI 2 - and-let*
SRFI 5 - let with signatures and rest arguments
SRFI 6 - Basic string ports
SRFI 7 - Program configuration
SRFI 8 - receive
SRFI 9 - Defining record types
SRFI 11 - Syntax for receiving multiple values
SRFI 13 - String Library
SRFI 14 - Character-Set Library (see note below)
SRFI 16 - Syntax for procedures of variable arity
SRFI 17 - Generalized set!
SRFI 22 - Running Scheme Scripts on Unix
SRFI 23 - Error reporting mechanism
SRFI 25 - Multi-dimensional Array Primitives
SRFI 26 - Notation for Specializing Parameters without Currying
SRFI 27 - Sources of Random Bits
SRFI 28 - Basic Format Strings
SRFI 31 - A special form rec for recursive evaluation
SRFI 37 - args-fold: a program argument processor
SRFI 42 - Eager Comprehensions
SRFI 45 - Primitives for Expressing Iterative Lazy Algorithms

Documentation on these can be found at the web site mentioned above.

SRFI 14 includes the procedure ->char-set which is not a standard Scheme identifier (in R⁵RS the only required identifier starting with - is - itself). In the Scheme 48 version of SRFI 14 we have renamed ->char-set as x->char-set.

The SRFI bindings can be accessed either by opening the appropriate structure (the structure srfi-n contains SRFI n) or by loading structure srfi-7 and then using the ,load-srfi-7-program command to load an SRFI 7-style program. The syntax for the command is

,load-srfi-7-program name filename

This creates a new structure and associated package, binds the structure to name in the configuration package, and then loads the program found in filename into the package.

As an example, if the file test.scm contains

(program (code (define x 10)))

this program can be loaded as follows:

> ,load-package srfi-7
> ,load-srfi-7-program test test.scm
[test]
> ,in test
test> x
10
test>

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