cyclone/docs/Features.md

Features

This page summarizes the Scheme language features implemented by Cyclone.

R⁷RS Compliance

This is the status of features implemented from the R⁷RS Scheme Specification:

Section	Status	Comments
2.2 Whitespace and comments	Partial	No datum or block comments
2.3 Other notations
2.4 Datum labels	No
3.1 Variables, syntactic keywords, and regions
3.2 Disjointness of types	Yes
3.3 External representations
3.4 Storage model		No immutable types at this time.
3.5 Proper tail recursion	Yes
4.1 Primitive expression types
4.2 Derived expression types
4.3 Macros
5.1 Programs	Yes
5.2 Import declarations
5.3 Variable definitions	Partial	define-values is not implemented yet.
5.4 Syntax definitions
5.5 Record-type definitions
5.6 Libraries	Partial	Support is "good enough" but need to make it more robust
5.7 The REPL	Yes
6.1 Equivalence predicates	Yes	eqv? is not implemented, it is just an alias to eq?
6.2 Numbers	Partial	Integers and reals are supported, but most numeric functions are missing at this time.
6.3 Booleans	Yes	#true and #false are not recognized by parser.
6.4 Pairs and lists	Yes	member functions are predicates, member and assoc do not accept compare argument.
6.5 Symbols	Yes
6.6 Characters	Partial	No unicode support, char-ci predicates are not implemented.
6.7 Strings	Partial	No unicode support, string-ci functions are not implemented.
6.8 Vectors	Yes
6.9 Bytevectors		Not supported yet.
6.10 Control features	Partial	The map and for-each families of functions only support one "data" argument - for example, string-map only accepts one string. values and call-with-values are not implemented. dynamic-wind is limited, and does not work across calls to continuations.
6.11 Exceptions	Partial	Exceptions are implemented but error objects (and associated functions error-object, etc) are not at this time.
6.12 Environments and evaluation	Partial	Only eval is implemented at this time.
6.13 Input and output	Partial	Functions do not differentiate between binary and textual ports. Do not have support for input/output strings or bytevectors.
6.14 System interface		TODO: most of these are not implemented

Cyclone-specific

Cyclone also supports several non-standard features:

• system
• command-line-arguments
• what else?