tame/src/symtable.xsl

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<?xml version="1.0"?>
<!--
Symbol table
Copyright (C) 2016 LoVullo Associates, Inc.
This file is part of TAME.
TAME is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
-->
<stylesheet version="2.0"
xmlns="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:f="http://mikegerwitz.com/hoxsl/apply"
xmlns:symtable="http://www.lovullo.com/tame/symtable"
xmlns:preproc="http://www.lovullo.com/rater/preproc">
<import href="symtable.xsl.apply" />
<!--
@node Symbol Table
@section Symbol Table
The @dfn{symbol table} holds declarations for each symbol known to
a@tie{}particular package.
Symbol tables are represented by @code{preproc:syms}
elements.@footnote{
The @code{preproc} namespace exists for legacy reasons;
it will change in the future.}
A @dfn{symbol} is an abstract representation of some object@mdash{
}a calculation, classification, typedef, etc.@mdash{
}containing the source location and useful metadata.
@todo{Document symbol format and metadata.}
Symbols are represented by @code{preproc:sym} elements.
-->
<!--
Produce a list of duplicate symbols in@tie{}@var{$symtable},
grouped by @code{@@name}.
All duplicates will be returned@mdash{
}that is, if @math{S_1} appears before duplicate @math{S_2}
in the symbol table, both@tie{}@math{S_1} and@tie{}@math{S_2}
will be returned.
If two symbols have duplicate @code{@@name}s but the same
@code{@@src},
then they are not considered to be duplicates,
@emph{unless} another duplicate symbol of the
same@tie{}@code{@@name} is found with a different @code{@@src},
in which case all symbols will be returned.
This allows sloppy comparison on concatenated symbol tables before
tidying it up.
Externs are ignored, since they represent symbols that need to be
satisfied at some point@mdash{
}this will be checked during linking.
Symbols (@code{preproc:sym} nodes) are returned by reference.
This method name is ``find'' duplicates rather than ``get'' to
emphasize that processing is performed, which is potentially
intensive given a large symbol table@tie{}@var{$symtable}.
-->
<function name="symtable:find-duplicates" as="element( preproc:sym )*">
<param name="symtable" as="element( preproc:syms )" />
<for-each-group select="$symtable/preproc:sym[
not( @extern = 'true' ) ]"
group-by="@name">
<!-- @src may be omitted to convey a local symbol -->
<variable name="srcs" as="xs:string*"
select="distinct-values(
for $sym in current-group()
return if ( exists( $sym/@src ) ) then
$sym/@src
else
'.' )" />
<sequence select="if ( count( $srcs ) gt 1 ) then
current-group()
else
()" />
</for-each-group>
</function>
<!--
@menu
* Symbol Format:: Anatomy of a symbol table entry
* Symbol Types:: Symbols describing various objects
@end menu
@lowersections
@include ../src/symtable/symbols.texi
@raisesections
-->
</stylesheet>