Domovská stránka Prehľadávať Pomoc
Registrovať Prihlásiť sa
beoran
/
attl
1
0
Fork 0
Súbory Issues 0 Pull requesty 0 Wiki

A Tiny Tool Language.

Attl is a TCL-like embedded scripting language implemented in Go.

Branch: master
Branche Tagy
attl
ZIP TAR.GZ
Beoran e702d5e29e Add most ATTL files. 2 rokov pred
cmd e702d5e29e Add most ATTL files. 2 rokov pred
.gitignore 066a57a682 Initial commit 2 rokov pred
LICENSE e702d5e29e Add most ATTL files. 2 rokov pred
README.md e702d5e29e Add most ATTL files. 2 rokov pred
attl e702d5e29e Add most ATTL files. 2 rokov pred
attl.go e702d5e29e Add most ATTL files. 2 rokov pred
builtin.go e702d5e29e Add most ATTL files. 2 rokov pred
convert.go e702d5e29e Add most ATTL files. 2 rokov pred
effect.go e702d5e29e Add most ATTL files. 2 rokov pred
environment.go e702d5e29e Add most ATTL files. 2 rokov pred
go.mod e702d5e29e Add most ATTL files. 2 rokov pred
go.sum e702d5e29e Add most ATTL files. 2 rokov pred
parse.go e702d5e29e Add most ATTL files. 2 rokov pred
parse_test.go e702d5e29e Add most ATTL files. 2 rokov pred
support.go e702d5e29e Add most ATTL files. 2 rokov pred
support_test.go e702d5e29e Add most ATTL files. 2 rokov pred
tutorial.attl e702d5e29e Add most ATTL files. 2 rokov pred
value.go e702d5e29e Add most ATTL files. 2 rokov pred

README.md

attl

A Tiny Tool Language.

Attl is a TCL-like embedded scripting language implemented in Go.# ATTL

Introduction

Attl is A Tiny Tool Language, an embeddable, interpreted scripting language, implemented in Go, that somewhat resembles TCL and shell scripts, but with typed values, and LISP like semantics.

One notable feature is that the language itself has no key words, nor flow control by itself, but that this is provided by the commands that ATTL executes. This makes it possible to disable certain commands, or example, in case where it is desirable for the script to be not Turing complete.

The syntax is extremelty simple, and based on a rescursive descent LL1 parser, where the parser only considers the next character and the current state of parsing to deterine the meaning of the code. Code that is easy to parse by the computer is easy to understand by humans also, which is why the limitations of LL1 parsing are acceptable.

Grammar

The formal grammar of ATTL is as follows:

SCRIPT -> STATEMENTS . STATEMENTS -> STATEMENT OPTSTATEMENTS . OPTSTATEMENTS -> rs STATEMENT OPTSTATEMENTS | . STATEMENT -> OPTWS EXPRESSION . EXPRESSION -> COMMAND | BLOCK | comment | . OPTWS -> ws | . COMMAND -> ORDER PARAMETERS . ORDER -> LITERAL | EVALUATION . BLOCK -> ob STATEMENTS cb . PARAMETERS -> ws PARAMETER OPTPARAMETERS | . PARAMETER -> LITERAL | BLOCK | GETTER | EVALUATION | . EVALUATION -> oe COMMAND ce . GETTER -> get TARGET . TARGET -> GETTER | LITERAL . LITERAL -> word | string | integer . rs -> /[\n\r]+/ . ws -> /[\t ]+/ . word -> /[^ \t\n\$(){}][]+/ string -> /"[^"]+"/ | /[^]+`/ integer -> [+-]?[0-9]+ comment -> /#[^\n]+\n/ . get -> '$' . oe -> '[' . ce -> ']' . ob -> '{' . cb -> '}' .