rtg2sig — generates a Stratego signature from a regular tree grammar (RTG)
rtg2sig
[--module name]
[-i file | --input file]
[-o file | --output file]
[-b]
[-S | --silent]
[--verbose level]
[-k level | --keep level]
[-h | -? | --help]
[--about]
[--version]
The rtg2sig utility is used to generates a Stratego signature from a regular tree grammar.
Module Options
--module name
Specifies that the module name of the resulting Stratego file should
be name. If --module is
not given, the output file name is used. If that is not known, the
input file name is used.
Common Input/Output Options
-i file
The input term given by the file name file
In the absence of the -i option, input
will be read from stdin.
-o file
The output will be written to the file given by the file name
file
In the absence of the -o option,
output will be written to stdout.
-bThe output will be written in the binary (BAF) ATerm format.
ATerms in the BAF format require a lot less space than ones in the TAF format, but the Java ATerm library does not currently support baf ATerms. ATerms in the baf format is the preferred format of exchange between Stratego tools.
Common Debugging Options
--about
See --version.
-h, -?, --helpDisplay usage information.
--keep int
Keep intermediate results produced by the internal stages in the
pretty-printing process. This is only useful for debugging. A high
value of int indicates increased eagerness
for keeping intermediate results.
Default setting is 0, indicating that no intermediates will be kept.
-S, --silent
Silent execution. Same as --verbose .
0
--verbose int
Set verbosity level to numerical value int. The
higher the number, the more information about pp-aterm's inner workings are
printed.
Alternatively, int can be set to either of the
following verbosity levels, given in increasing order of verbosity:
emergency, alert, critical,
error, warning, notice,
info, debug, vomit.
--versionDisplays the tool name and version.
Consider the regular tree grammar given below (the exciting part about how we created this from an SDF definition can be gleaned from the example for sdf2rtg):
regular tree grammar
start Exp
productions
Exp -> Minus(Exp,Exp)
Exp -> Plus(Exp,Exp)
Exp -> Mod(Exp,Exp)
Exp -> Div(Exp,Exp)
Exp -> Mul(Exp,Exp)
Exp -> Int(IntConst)
Exp -> Var(Id)
IntConst -> <string>
Id -> <string>
Provided that this this regular tree grammar is stored in the file
Exp.rtg, it can be converted into a Stratego
signature using rtg2sig, as follows:
$ rtg2sig -i Exp.rtg -o Exp.str
The resulting Stratego signature given below may be used directly
by your Stratego programs by importing the Exp module.
module Exp
imports list-cons option
signature
constructors
Minus : Exp * Exp -> Exp
Plus : Exp * Exp -> Exp
Mod : Exp * Exp -> Exp
Div : Exp * Exp -> Exp
Mul : Exp * Exp -> Exp
Int : IntConst -> Exp
Var : Id -> Exp
: String -> IntConst
: String -> Id
Copyright (C) 2002-2005 Eelco Visser <visser@acm.org>
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.