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-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007-2008, Gabriel Dos Reis.
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
--
-- - Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
--
-- - Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in
-- the documentation and/or other materials provided with the
-- distribution.
--
-- - Neither the name of The Numerical ALgorithms Group Ltd. nor the
-- names of its contributors may be used to endorse or promote products
-- derived from this software without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import ptrees
namespace BOOT
--% Macro expansion
-- Functions to transform parse forms.
--
-- Global variables:
-- $pfMacros is an alist [[id, state, body-pform], ...]
-- (set in newcompInit).
-- state is one of: mbody, mparam, mlambda
--
-- $macActive is a list of the bodies being expanded.
-- $posActive is a list of the parse forms where the bodies came from.
-- Beware: the name macroExpand is used by the old compiler.
macroExpanded pf ==
$macActive: local := []
$posActive: local := []
macExpand pf
macExpand pf ==
pfWhere? pf => macWhere pf
pfLambda? pf => macLambda pf
pfMacro? pf => macMacro pf
pfId? pf => macId pf
pfApplication? pf => macApplication pf
pfMapParts(function macExpand, pf)
macWhere pf ==
mac(pf,$pfMacros) where
mac(pf,$pfMacros) ==
-- pfWhereContext is before pfWhereExpr
pfMapParts(function macExpand, pf)
macLambda pf ==
mac(pf,$pfMacros) where
mac(pf,$pfMacros) ==
pfMapParts(function macExpand, pf)
macLambdaParameterHandling( replist , pform ) ==
pfLeaf? pform => []
pfLambda? pform => -- remove ( identifier . replacement ) from assoclist
parlist := [ pfTypedId p for p in pf0LambdaArgs pform ] -- extract parameters
for par in [ pfIdSymbol par for par in parlist ] repeat
replist := AlistRemoveQ(par,replist)
replist
pfMLambda? pform => -- construct assoclist ( identifier . replacement )
parlist := pf0MLambdaArgs pform -- extract parameter list
[[pfIdSymbol par ,:pfLeaf( pfAbSynOp par,GENSYM(),pfLeafPosition par)] for par in parlist ]
for p in pfParts pform repeat macLambdaParameterHandling( replist , p )
macSubstituteId( replist , pform ) ==
ex := AlistAssocQ( pfIdSymbol pform , replist )
ex =>
RPLPAIR(pform,CDR ex)
pform
pform
macSubstituteOuter( pform ) ==
mac0SubstituteOuter( macLambdaParameterHandling( [] , pform ) , pform )
mac0SubstituteOuter( replist , pform ) ==
pfId? pform => macSubstituteId( replist , pform )
pfLeaf? pform => pform
pfLambda? pform =>
tmplist := macLambdaParameterHandling( replist , pform )
for p in pfParts pform repeat mac0SubstituteOuter( tmplist , p )
pform
for p in pfParts pform repeat mac0SubstituteOuter( replist , p )
pform
-- This function adds the appropriate definition and returns
-- the original Macro pform.
macMacro pf ==
lhs := pfMacroLhs pf
rhs := pfMacroRhs pf
not pfId? lhs =>
ncSoftError (pfSourcePosition lhs, 'S2CM0001, [%pform lhs] )
pf
sy := pfIdSymbol lhs
mac0Define(sy, (pfMLambda? rhs => 'mlambda; 'mbody), macSubstituteOuter rhs)
pf
mac0Define(sy, state, body) ==
$pfMacros := cons([sy, state, body], $pfMacros)
-- Returns [state, body] or NIL.
mac0Get sy ==
IFCDR assoc(sy, $pfMacros)
-- Returns [sy, state] or NIL.
mac0GetName body ==
name := nil
for [sy,st,bd] in $pfMacros while not name repeat
if st = 'mlambda then
bd := pfMLambdaBody bd
EQ(bd, body) => name := [sy,st]
name
macId pf ==
sy := pfIdSymbol pf
not (got := mac0Get sy) => pf
[state, body] := got
state = 'mparam => body -- expanded already
state = 'mlambda => pfCopyWithPos( body , pfSourcePosition pf ) -- expanded later
pfCopyWithPos( mac0ExpandBody(body, pf, $macActive, $posActive) , pfSourcePosition pf )
macApplication pf ==
pf := pfMapParts(function macExpand, pf)
op := pfApplicationOp pf
not pfMLambda? op => pf
args := pf0ApplicationArgs pf
mac0MLambdaApply(op, args, pf, $pfMacros)
mac0MLambdaApply(mlambda, args, opf, $pfMacros) ==
params := pf0MLambdaArgs mlambda
body := pfMLambdaBody mlambda
#args ^= #params =>
pos := pfSourcePosition opf
ncHardError(pos,'S2CM0003, [#params,#args])
for p in params for a in args repeat
not pfId? p =>
pos := pfSourcePosition opf
ncHardError(pos, 'S2CM0004, [%pform p])
mac0Define(pfIdSymbol p, 'mparam, a)
mac0ExpandBody( body , opf, $macActive, $posActive)
mac0ExpandBody(body, opf, $macActive, $posActive) ==
MEMQ(body,$macActive) =>
[.,pf] := $posActive
posn := pfSourcePosition pf
mac0InfiniteExpansion(posn, body, $macActive)
$macActive := [body, :$macActive]
$posActive := [opf, :$posActive]
macExpand body
mac0InfiniteExpansion(posn, body, active) ==
blist := [body, :active]
[fname, :rnames] := [name b for b in blist] where
name b ==
got := mac0GetName b
not got => '"???"
[sy,st] := got
st = 'mlambda => CONCAT(PNAME sy, '"(...)")
PNAME sy
ncSoftError (posn, 'S2CM0005, _
[ [:[n,'"==>"] for n in reverse rnames], fname, %pform body ] )
body
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