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50 lines
2.5 KiB
Markdown
50 lines
2.5 KiB
Markdown
# Features
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This page summarizes the Scheme language features implemented by Cyclone.
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## R<sup>7</sup>RS Compliance
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This is the status of features implemented from the [R<sup>7</sup>RS Scheme Specification](http://trac.sacrideo.us/wg/wiki):
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Section | Status | Comments
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------- | ------ | ---------
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2.2 Whitespace and comments | Partial | No datum or block comments
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2.3 Other notations | |
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2.4 Datum labels | No |
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3.1 Variables, syntactic keywords, and regions | |
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3.2 Disjointness of types | Yes |
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3.3 External representations | |
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3.4 Storage model | | No immutable types at this time.
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3.5 Proper tail recursion | Yes |
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4.1 Primitive expression types | |
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4.2 Derived expression types | |
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4.3 Macros | |
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5.1 Programs | Yes |
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5.2 Import declarations | |
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5.3 Variable definitions | Partial | `define-values` is not implemented yet.
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5.4 Syntax definitions | |
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5.5 Record-type definitions | |
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5.6 Libraries | Partial | Support is "good enough" but need to make it more robust
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5.7 The REPL | Yes |
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6.1 Equivalence predicates | Yes | `eqv?` is not implemented, it is just an alias to `eq?`
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6.2 Numbers | Partial | Integers and reals are supported, but most numeric functions are missing at this time.
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6.3 Booleans | Yes | `#true` and `#false` are not recognized by parser.
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6.4 Pairs and lists | Yes | `member` functions are predicates, `member` and `assoc` do not accept `compare` argument.
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6.5 Symbols | Yes |
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6.6 Characters | Partial | No unicode support, `char-ci` predicates are not implemented.
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6.7 Strings | Partial | No unicode support, `string-ci` functions are not implemented.
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6.8 Vectors | Yes |
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6.9 Bytevectors | | Not supported yet.
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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.
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6.11 Exceptions | Partial | Exceptions are implemented but error objects (and associated functions `error-object`, etc) are not at this time.
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6.12 Environments and evaluation | Partial | Only `eval` is implemented at this time.
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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.
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6.14 System interface | | TODO: most of these are not implemented
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## Cyclone-specific
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Cyclone also supports several non-standard features:
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- `system`
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- `command-line-arguments`
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- what else?
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