128 lines
5.0 KiB
Markdown
128 lines
5.0 KiB
Markdown
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This product is developed at the second-grade course, Informatic Science
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Basic Experiment class at the University of Tokyo.
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# Picrin - a lightweight scheme interpreter
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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 technology)
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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 strategy)
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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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## 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 | incomplete | apply, call/cc, call/values, eval are not yet |
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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 | no | `include` and `include-ci` |
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| 4.2.1 Conditionals | incomplete | TODO: `cond-expand` |
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| 4.2.2 Binding constructs | incomplete | TODO: `let-values`, `let*-values` |
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| 4.2.3 Sequencing | yes | |
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| 4.2.4 Iteration | yes | TODO: `do` is unsafe when nested |
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| 4.2.5 Delayed evaluation | N/A | |
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| 4.2.6 Dynamic bindings | no | TODO: `make-parameter`, `parameterize` in C level |
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| 4.2.7 Exception handling | no | `guard` syntax. |
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| 4.2.8 Quasiquotation | incomplete | nested is unsupported |
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| 4.2.9 Case-lambda | N/A | |
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| 4.3.1 Bindings constructs for syntactic keywords | no | Instead, picrin provides so-called legacy macro facility (`define-macro`). |
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| 4.3.2 Pattern language | -- | see above. |
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| 4.3.3 Signaling errors in macro transformers | -- | see above. |
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| 5.1 Programs | yes | |
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| 5.2 Import declarations | no | |
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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 | no | |
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| 5.4 Syntax definitions | -- | see notes on section 4.3.1. |
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| 5.5 Recored-type definitions | no | |
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| 5.6.1 Library Syntax | no | |
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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 | 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 | incomplete | TODO: almost all functions in the section :-( |
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| 6.7 Strings | incomplete | |
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| 6.8 Vectors | incomplete | TODO: `vector-copy`, ...etc |
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| 6.9 Bytevectors | incomplete | TODO: string<->utf8 conversion, etc |
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| 6.10 Control features | incomplete | TODO: `string-map`, `vector-map`, ...etc |
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| 6.11 Exceptions | no | |
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| 6.12 Environments and evaluation | no | |
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| 6.13 Ports | incomplete | |
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| 6.14 System interface | incomplete | `exit` is unsafe when used with dynamic-wind |
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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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$ make build
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built executable binary will be under bin/ directory and shared library `libpicrin.so` under lib/.
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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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By default make command runs REPL with all debug flags enabled.
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$ make
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In the default option, when `make` command is called without arguments, it builds the binary and right after that dropped into the picrin interactive shell (REPL).
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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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Yuichi Nishiwaki (yuichi.nishiwaki at gmail.com)
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