165 lines
6.1 KiB
Markdown
165 lines
6.1 KiB
Markdown
# Picrin [](https://travis-ci.org/wasabiz/picrin)
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Picrin is a lightweight scheme implementation intended to comply with full R7RS specification. Its code is written in pure C99 and does not requires any special external libraries installed on the platform.
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## Features
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- R7RS compatibility (but partial support)
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- reentrant design (all VM states are stored in single global state object)
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- bytecode interpreter (based on Stack VM)
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- direct threaded VM
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- Internal representation by Nan-Boxing
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- conservative call/cc implementation (users can freely interleave native stack with VM stack)
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- exact GC (simple mark and sweep, partially reference count is used as well)
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- support full set hygienic macro transformers, including implicit renaming macros
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- extended library syntax
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- advanced REPL support (multi-line input, etc)
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- tiny & portable library (all functions will be in `libpicrin.so`)
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## Libraries
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- `(scheme base)`
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- `(scheme write)`
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- `(scheme cxr)`
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- `(scheme file)`
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- `(scheme inexact)`
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- `(scheme time)`
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- `(scheme process-context)`
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- `(scheme load)`
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- `(picrin macro)`
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- `define-macro`
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- `gensym`
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- `macroexpand`
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Old-fashioned macro facility.
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- `make-syntactic-closure`
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- `identifier?`
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- `identifier=?`
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Syntactic closures.
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- `er-macro-transformer`
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- `ir-macro-transformer`
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Explicit renaming macro families.
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- `(srfi 1)`
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List manipulation library.
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## Compliance with R7RS
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| section | status | comments |
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| --- | --- | --- |
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| 2.2 Whitespace and comments | incomplete | block comments are not implemented |
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| 2.3 Other notations | incomplete | #e #i #b #o #d #x |
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| 2.4 Datum labels | no | unsupported |
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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`. TODO: Once `read` is implemented rewrite `include` macro with it. |
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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 |
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| 4.2.9 Case-lambda | N/A | |
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| 4.3.1 Bindings constructs for syntactic keywords | incomplete | (*1) |
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| 4.3.2 Pattern language | no | `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 | TODO: internal macro definition is not supported. |
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| 5.5 Recored-type definitions | no | |
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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 | TODO: equal? must terminate if circular structure is given |
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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 | no | |
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| 6.3 Booleans | yes | |
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| 6.4 Pairs and lists | yes | |
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| 6.5 Symbols | yes | |
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| 6.6 Characters | yes | |
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| 6.7 Strings | yes | `substring` is not provided |
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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 | TODO: native error handling |
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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 | incomplete | |
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| 6.13.3 Output | yes | TODO: `write`, `write-shared` and `display` are unsafe against circular objects |
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| 6.14 System interface | yes | |
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1. 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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## Homepage
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Currently picrin is hosted on Github. You can freely send a bug report or pull-request, and fork the repository.
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https://github.com/wasabiz/picrin
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## How to use it
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- build
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A built executable binary will be under bin/ directory and a shared library `libpicrin.so` under lib/.
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$ make
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If you want to build picrin on other systems than x86_64, make sure PIC_NAN_BOXING flag is turned off (see include/config.h for detail).
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- run
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Simply directly run the binary `bin/picrin` from terminal, or you can use `make` to execute it like this.
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$ make run
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- debug-run
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When `make` command is called with an argument `debug`, it builds the binary with all debug flags enabled (PIC_GC_STRESS, VM_DEBUG, DEBUG).
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$ make debug
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- install
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As of now picrin does not provide a command automatically installs the binary. If you want to place picrin library and binary in a parmanent directory, please do it by hand.
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## Requirement
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picrin scheme depends on some external libraries to build the binary:
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- bison
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- yacc
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- make
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- gcc
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- readline
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The compilation is tested only on Mac OSX. I think (or hope) it'll be ok to compile and run on other operating systems such as Linux or Windows, but there's no guarantee :(
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## Authors
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See `AUTHORS`
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