91 lines
5.4 KiB
ReStructuredText
91 lines
5.4 KiB
ReStructuredText
Language
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========
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Picrin's core language is the R7RS scheme with some powerful extensions. Please visit http://r7rs.org/ for the information of R7RS's design and underlying thoughts.
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The REPL
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--------
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At the REPL start-up time, some usuful built-in libraries listed below will be automatically imported.
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- ``(scheme base)``
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- ``(scheme load)``
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- ``(scheme process-context)``
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- ``(scheme write)``
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- ``(scheme file)``
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- ``(scheme inexact)``
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- ``(scheme cxr)``
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- ``(scheme lazy)``
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- ``(scheme time)``
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- ``(scheme case-lambda)``
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- ``(scheme read)``
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Compliance with R7RS
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---------------------
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================================================ ========== ==========================================================================================================================
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section status comments
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================================================ ========== ==========================================================================================================================
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2.2 Whitespace and comments yes
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2.3 Other notations incomplete #e #i #b #o #d #x
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2.4 Datum labels yes
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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 yes
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3.5 Proper tail recursion yes As the report specifies, ``apply``, ``call/cc``, and ``call-with-values`` perform tail calls
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4.1.1 Variable references yes
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4.1.2 Literal expressions yes
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4.1.3 Procedure calls yes In picrin ``()`` is self-evaluating
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4.1.4 Procedures yes
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4.1.5 Conditionals yes In picrin ``(if #f #f)`` returns ``#f``
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4.1.6 Assignments yes
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4.1.7 Inclusion incomplete ``include-ci``
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4.2.1 Conditionals incomplete TODO: ``cond-expand``
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4.2.2 Binding constructs yes
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4.2.3 Sequencing yes
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4.2.4 Iteration yes
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4.2.5 Delayed evaluation N/A
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4.2.6 Dynamic bindings yes
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4.2.7 Exception handling no ``guard`` syntax.
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4.2.8 Quasiquotation yes can be safely nested. TODO: multiple argument for unquote
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4.2.9 Case-lambda N/A
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4.3.1 Bindings constructs for syntactic keywords incomplete [#]_
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4.3.2 Pattern language yes ``syntax-rules``
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4.3.3 Signaling errors in macro transformers yes
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5.1 Programs yes
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5.2 Import declarations incomplete only simple import declarations, no support for import with renaming.
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5.3.1 Top level definitions yes
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5.3.2 Internal definitions yes TODO: interreferential definitions
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5.3.3 Multiple-value definitions yes
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5.4 Syntax definitions yes
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5.5 Recored-type definitions yes
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5.6.1 Library Syntax incomplete In picrin, libraries can be reopend and can be nested.
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5.6.2 Library example N/A
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5.7 The REPL yes
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6.1 Equivalence predicates yes
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6.2.1 Numerical types yes picrin has only two types of internal representation of numbers: fixnum and double float. It still comforms the R7RS spec.
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6.2.2 Exactness yes
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6.2.3 Implementation restrictions yes
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6.2.4 Implementation extensions yes
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6.2.5 Syntax of numerical constants yes
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6.2.6 Numerical operations yes ``denominator``, ``numerator``, and ``rationalize`` are not supported for now. Also, picrin does not provide complex library procedures.
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6.2.7 Numerical input and output incomplete only partial support supplied.
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6.3 Booleans yes
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6.4 Pairs and lists yes ``list?`` is safe for using against circular list.
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6.5 Symbols yes
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6.6 Characters yes
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6.7 Strings yes
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6.8 Vectors yes
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6.9 Bytevectors yes
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6.10 Control features yes
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6.11 Exceptions yes ``raise-continuable`` is not supported
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6.12 Environments and evaluation N/A
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6.13.1 Ports yes
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6.13.2 Input yes
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6.13.3 Output yes
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6.14 System interface yes
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================================================ ========== ==========================================================================================================================
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.. [#] Picrin provides hygienic macros in addition to so-called legacy macro (``define-macro``), such as syntactic closure, explicit renaming macro, and implicit renaming macro. As of now let-syntax and letrec-syntax are not provided.
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