implode-asfix — maps an asfix parse tree to an abstract syntax tree
implode-asfix
[--lex]
[--layout]
[--lit]
[--alt]
[--appl]
[--nt]
[--inj]
[--list]
[--seq]
[--pt]
[--concrete]
[-i file | --input file]
[-o file | --output file]
[-b]
[-S | --silent]
[--verbose level]
[--k level | --keep level]
[-h | -? | --help]
[--about]
[--version]
The implode-asfix utility maps an AsFix tree to an abstract syntax tree. The mapping performs several transformations, including:
remove layout
flatten lexical subtrees to strings
replace appl(prod(...),[...]) applications by
constructor applications, if the production is annotated
with a cons(...) attribute.
The input tree is required to be in AsFix2 format. See the AsFix section for more information about the AsFix format.
Implode Options
--altFlatten alternatives.
--appl
Replace appl applications by constructor applications.
--concrete
Skip concrete syntax parts of a Stratego program. Concrete
syntax starts a ToTerm,
ToStrategy or
ToBuild and stops at
FromTerm or
FromApp.
--injRemove injections from the parse tree.
--layoutRemove layout nodes from the parse tree.
--lexFlatten lexical substrings to strings.
--listFlatten lists.
--litRemove literal nodes from the parse tree.
--nt
Replace appl application by non-terminal applications.
--pt
Remove the outer pt constructor from the
parse tree
--seqReplace sequences by tuples
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.
The implosion of parse trees by implode-asfix uses the
cons annotation of SDF productions. For
instance, the following annotation are typical for a small
expression language.
module Exp
exports
context-free start-symbols Exp
sorts Id IntConst Exp
lexical syntax
[\ \t\n] -> LAYOUT
[a-zA-Z]+ -> Id
[0-9]+ -> IntConst
context-free syntax
Id -> Exp {cons("Var")}
IntConst -> Exp {cons("Int")}
Exp "*" Exp -> Exp {left, cons("Mul")}
Exp "/" Exp -> Exp {left, cons("Div")}
Exp "%" Exp -> Exp {left, cons("Mod")}
Exp "+" Exp -> Exp {left, cons("Plus")}
Exp "-" Exp -> Exp {left, cons("Minus")}
context-free priorities
{left:
Exp "*" Exp -> Exp
Exp "/" Exp -> Exp
Exp "%" Exp -> Exp
}
> {left:
Exp "+" Exp -> Exp
Exp "-" Exp -> Exp
}
Invoking sglr followed by implode-asfix results in an abstract syntax tree.
$ echo "1 + 2 * 3" | sglr -2 -p Exp.def.tbl | implode-asfix
Plus(Int("1"),Mul(Int("2"),Int("3")))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.