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|
-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007-2009, 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.
--
--
-- Abstract:
-- This file defines the Boot grammar and parser. The parser
-- is hand-written based on `parser combinators' technology.
--
import includer
import scanner
import ast
namespace BOOTTRAN
module parser
++ true when the current function definition has its parameters
++ written round parenthesis.
$sawParenthesizedHead := false
bpFirstToken()==
$stok:=
if null $inputStream
then shoeTokConstruct("ERROR","NOMORE",shoeTokPosn $stok)
else first $inputStream
$ttok:=shoeTokPart $stok
true
bpFirstTok()==
$stok:=
if null $inputStream
then shoeTokConstruct("ERROR","NOMORE",shoeTokPosn $stok)
else first $inputStream
$ttok:=shoeTokPart $stok
$bpParenCount>0 and EQCAR($stok,"KEY") =>
EQ($ttok,"SETTAB")=>
$bpCount:=$bpCount+1
bpNext()
EQ($ttok,"BACKTAB")=>
$bpCount:=$bpCount-1
bpNext()
EQ($ttok,"BACKSET")=>
bpNext()
true
true
bpNext() ==
$inputStream := rest($inputStream)
bpFirstTok()
bpNextToken() ==
$inputStream := rest($inputStream)
bpFirstToken()
bpState()== [$inputStream,$stack,$bpParenCount,$bpCount]
--cons($inputStream,$stack)
bpRestore(x)==
$inputStream:=first x
bpFirstToken()
$stack:=second x
$bpParenCount:=third x
$bpCount:=CADDDR x
true
bpPush x==$stack:=[x,:$stack]
bpPushId()==
$stack:= [bfReName $ttok,:$stack]
bpPop1()==
a:=first $stack
$stack:=rest $stack
a
bpPop2()==
a:=second $stack
RPLACD($stack,CDDR $stack)
a
bpPop3()==
a:=third $stack
RPLACD(rest $stack,CDDDR $stack)
a
bpIndentParenthesized f==
$bpCount:local:=0
a:=$stok
if bpEqPeek "OPAREN"
then
$bpParenCount:=$bpParenCount+1
bpNext()
if apply(f,nil) and bpFirstTok() and
(bpEqPeek "CPAREN" or bpParenTrap(a))
then
$bpParenCount:=$bpParenCount-1
bpNextToken()
$bpCount=0 => true
$inputStream:=append( bpAddTokens $bpCount,$inputStream)
bpFirstToken()
$bpParenCount=0 =>
bpCancel()
true
true
else if bpEqPeek "CPAREN"
then
bpPush bfTuple []
$bpParenCount:=$bpParenCount-1
bpNextToken()
true
else bpParenTrap(a)
else false
bpParenthesized f==
a:=$stok
if bpEqKey "OPAREN"
then
if apply(f,nil) and (bpEqKey "CPAREN" or bpParenTrap(a))
then true
else if bpEqKey "CPAREN"
then
bpPush bfTuple []
true
else bpParenTrap(a)
else false
bpBracket f==
a:=$stok
if bpEqKey "OBRACK"
then
if apply(f,nil) and (bpEqKey "CBRACK" or bpBrackTrap(a))
then bpPush bfBracket bpPop1 ()
else if bpEqKey "CBRACK"
then bpPush []
else bpBrackTrap(a)
else false
bpPileBracketed f==
if bpEqKey "SETTAB"
then if bpEqKey "BACKTAB"
then true
else if apply(f,nil) and
(bpEqKey "BACKTAB" or bpPileTrap())
then bpPush bfPile bpPop1()
else false
else false
bpListof(f,str1,g)==
if apply(f,nil)
then
if bpEqKey str1 and (apply(f,nil) or bpTrap())
then
a:=$stack
$stack:=nil
while bpEqKey str1 and (apply(f,nil) or bpTrap()) repeat 0
$stack:=[NREVERSE $stack,:a]
bpPush FUNCALL(g, [bpPop3(),bpPop2(),:bpPop1()])
else
true
else false
-- to do ,<backset>
bpListofFun(f,h,g)==
if apply(f,nil)
then
if apply(h,nil) and (apply(f,nil) or bpTrap())
then
a:=$stack
$stack:=nil
while apply(h,nil) and (apply(f,nil) or bpTrap()) repeat 0
$stack:=[NREVERSE $stack,:a]
bpPush FUNCALL(g, bfListOf [bpPop3(),bpPop2(),:bpPop1()])
else
true
else false
bpList(f,str1,g)==
if apply(f,nil)
then
if bpEqKey str1 and (apply(f,nil) or bpTrap())
then
a:=$stack
$stack:=nil
while bpEqKey str1 and (apply(f,nil) or bpTrap()) repeat 0
$stack:=[NREVERSE $stack,:a]
bpPush FUNCALL(g, [bpPop3(),bpPop2(),:bpPop1()])
else
bpPush FUNCALL(g, [bpPop1()])
else bpPush FUNCALL(g, [])
bpOneOrMore f==
apply(f,nil)=>
a:=$stack
$stack:=nil
while apply(f,nil) repeat 0
$stack:=[NREVERSE $stack,:a]
bpPush [bpPop2(),:bpPop1()]
false
-- s must transform the head of the stack
bpAnyNo s==
while apply(s,nil) repeat 0
true
-- AndOr(k,p,f)= k p
bpAndOr(keyword,p,f)==
bpEqKey keyword and (apply(p,nil) or bpTrap())
and bpPush FUNCALL(f, bpPop1())
bpConditional f==
if bpEqKey "IF" and (bpWhere() or bpTrap()) and
(bpEqKey "BACKSET" or true)
then
if bpEqKey "SETTAB"
then if bpEqKey "THEN"
then (apply(f,nil) or bpTrap()) and bpElse(f) and bpEqKey "BACKTAB"
else bpMissing "THEN"
else if bpEqKey "THEN"
then (apply(f,nil) or bpTrap()) and bpElse(f)
else bpMissing "then"
else false
bpElse(f)==
a:=bpState()
if bpBacksetElse()
then (apply(f,nil) or bpTrap()) and
bpPush bfIf(bpPop3(),bpPop2(),bpPop1())
else
bpRestore a
bpPush bfIfThenOnly(bpPop2(),bpPop1())
bpBacksetElse()==
if bpEqKey "BACKSET"
then bpEqKey "ELSE"
else bpEqKey "ELSE"
bpEqPeek s == EQCAR($stok,"KEY") and EQ(s,$ttok)
bpEqKey s == EQCAR($stok,"KEY") and EQ(s,$ttok) and bpNext()
bpEqKeyNextTok s == EQCAR($stok,"KEY") and EQ(s,$ttok) and
bpNextToken()
bpPileTrap() == bpMissing "BACKTAB"
bpBrackTrap(x) == bpMissingMate("]",x)
bpParenTrap(x) == bpMissingMate(")",x)
bpMissingMate(close,open)==
bpSpecificErrorAtToken(open, '"possibly missing mate")
bpMissing close
bpMissing s==
bpSpecificErrorHere(CONCAT(PNAME s,'" possibly missing"))
throw TRAPPOINT "TRAPPED"
bpCompMissing s == bpEqKey s or bpMissing s
bpTrap()==
bpGeneralErrorHere()
throw TRAPPOINT "TRAPPED"
bpRecoverTrap()==
bpFirstToken()
pos1 := shoeTokPosn $stok
bpMoveTo 0
pos2 := shoeTokPosn $stok
bpIgnoredFromTo(pos1, pos2)
bpPush [['"pile syntax error"]]
bpListAndRecover(f)==
a:=$stack
b:=nil
$stack:=nil
done:=false
c:=$inputStream
while not done repeat
-- $trapped:local:=false
found:=try apply(f,nil) catch TRAPPOINT
if found="TRAPPED"
then
$inputStream:=c
bpRecoverTrap()
else if not found
then
$inputStream:=c
bpGeneralErrorHere()
bpRecoverTrap()
if bpEqKey "BACKSET"
then
c:=$inputStream
else if bpEqPeek "BACKTAB" or null $inputStream
then
done:=true
else
$inputStream:=c
bpGeneralErrorHere()
bpRecoverTrap()
if bpEqPeek "BACKTAB" or null $inputStream
then done:=true
else
bpNext()
c:=$inputStream
b:=[bpPop1(),:b]
$stack:=a
bpPush NREVERSE b
bpMoveTo n==
null $inputStream => true
bpEqPeek "BACKTAB" =>
n=0 => true
bpNextToken()
$bpCount:=$bpCount-1
bpMoveTo(n-1)
bpEqPeek "BACKSET" =>
n=0 => true
bpNextToken()
bpMoveTo n
bpEqPeek "SETTAB" =>
bpNextToken()
bpMoveTo(n+1)
bpEqPeek "OPAREN" =>
bpNextToken()
$bpParenCount:=$bpParenCount+1
bpMoveTo n
bpEqPeek "CPAREN" =>
bpNextToken()
$bpParenCount:=$bpParenCount-1
bpMoveTo n
bpNextToken()
bpMoveTo n
-- A fully qualified name could be interpreted as a left reduction
-- of an '::' infix operator. At the moment, we don't use
-- that general interpretation.
-- When this routine is called, a symbol is already pushed on the
-- stack. When this routine finished execution, we have either
-- reduced a '::' and a name, or nothing. In either case, a
-- symbol is present on the stack.
bpQualifiedName() ==
bpEqPeek "COLON-COLON" =>
bpNext()
EQCAR($stok, "ID") and bpPushId() and bpNext()
and bpPush bfColonColon(bpPop2(), bpPop1())
false
++ Name:
++ ID
++ Name :: ID
bpName() ==
EQCAR( $stok,"ID") =>
bpPushId()
bpNext()
bpAnyNo function bpQualifiedName
false
++ Constant:
++ INTEGER
++ FLOAT
++ LISP
++ LISPEXPR
++ LINE
++ QUOTE S-Expression
++ STRING
bpConstTok() ==
MEMQ(shoeTokType $stok, '(INTEGER FLOAT)) =>
bpPush $ttok
bpNext()
EQCAR($stok,"LISP")=> bpPush bfReadLisp $ttok and bpNext()
EQCAR($stok,"LISPEXP")=> bpPush $ttok and bpNext()
EQCAR($stok,"LINE")=> bpPush ["+LINE", $ttok] and bpNext()
bpEqPeek "QUOTE" =>
bpNext()
(bpSexp() or bpTrap()) and
bpPush bfSymbol bpPop1()
bpString()
++ Subroutine of bpExportItem. Parses tails of ExportItem.
bpExportItemTail() ==
bpEqKey "BEC" and (bpAssign() or bpTrap()) and
bpPush %Assignment(bpPop2(), bpPop1())
or bpSimpleDefinitionTail()
++ ExportItem:
++ Structure
++ TypeAliasDefinition
++ Signature
++ Signature := Where
++ Signature == Where
bpExportItem() ==
bpEqPeek "STRUCTURE" => bpStruct()
a := bpState()
bpName() =>
bpEqPeek "COLON" =>
bpRestore a
bpSignature() or bpTrap()
bpExportItemTail() or true
bpRestore a
bpTypeAliasDefition()
false
++ ExportItemList:
++ Signature
++ ExportItemList Signature
bpExportItemList() ==
bpListAndRecover function bpExportItem
++ Exports:
++ pile-bracketed ExporItemList
bpExports() ==
bpPileBracketed function bpExportItemList
++ Parse a module definitoin
++ Module:
++ MODULE QUOTE String
bpModule() ==
bpEqKey "MODULE" =>
bpName() or bpTrap()
bpEqKey "WHERE" =>
bpExports() and bpPush %Module(bpPop2(), bpPop1())
bpPush %Module(bpPop1(),nil)
++ Parse a module import, or a import declaration for a foreign entity.
++ Import:
++ IMPORT Signature FOR Name
++ IMPORT Name
bpImport() ==
bpEqKey "IMPORT" =>
a := bpState()
bpName() or bpTrap()
bpEqPeek "COLON" =>
bpRestore a
(bpSignature() or bpTrap()) and
(bpEqKey "FOR" or bpTrap()) and
(bpName() or bpTrap()) and
bpPush %ImportSignature(bpPop1(), bpPop1())
bpPush %Import bpPop1()
false
++
++ Namespace:
++ NAMESPACE Name
bpNamespace() ==
bpEqKey "NAMESPACE" and bpName() and
bpPush %Namespace bpPop1()
-- Parse a type alias defnition:
-- type-alias-definition:
-- identifier <=> logical-expression
bpTypeAliasDefition() ==
(bpTerm function bpIdList or bpTrap()) and
bpEqKey "TDEF" and bpLogical() and
bpPush %TypeAlias(bpPop2(), bpPop1())
++ Parse a signature declaration
++ Signature:
++ Name COLON Mapping
bpSignature() ==
bpName() and bpEqKey "COLON" and bpMapping()
and bpPush %Signature(bpPop2(), bpPop1())
++ SimpleMapping:
++ Application
++ Application -> Application
bpSimpleMapping() ==
bpApplication() =>
bpEqKey "ARROW" and (bpApplication() or bpTrap()) and
bpPush %Mapping(bpPop1(), bfUntuple bpPop1())
true
false
++ ArgtypeList:
++ ( ArgtypeSequence )
++ ArgtypeSequence:
++ Application
++ Application , ArgtypeSequence
bpArgtypeList() ==
bpTuple function bpApplication
++ Parse a mapping expression
++ Mapping:
++ ArgtypeList -> Application
++ SimpleMapping
bpMapping() ==
bpParenthesized function bpArgtypeList and
bpEqKey "ARROW" and bpApplication() and
bpPush %Mapping(bpPop1(), bfUntuple bpPop1())
or bpSimpleMapping()
bpCancel()==
a:=bpState()
if bpEqKeyNextTok "SETTAB"
then if bpCancel()
then if bpEqKeyNextTok "BACKTAB"
then true
else
bpRestore a
false
else
if bpEqKeyNextTok "BACKTAB"
then true
else
bpRestore a
false
else false
bpAddTokens n==
n=0 => nil
n>0=> cons(shoeTokConstruct("KEY","SETTAB",shoeTokPosn $stok),bpAddTokens(n-1))
cons(shoeTokConstruct("KEY","BACKTAB",shoeTokPosn $stok),bpAddTokens(n+1))
bpExceptions()==
bpEqPeek "DOT" or bpEqPeek "QUOTE" or
bpEqPeek "OPAREN" or bpEqPeek "CPAREN" or
bpEqPeek "SETTAB" or bpEqPeek "BACKTAB"
or bpEqPeek "BACKSET"
bpSexpKey()==
EQCAR( $stok,"KEY") and not bpExceptions()=>
a:=GET($ttok,"SHOEINF")
null a=> bpPush $ttok and bpNext()
bpPush a and bpNext()
false
bpAnyId()==
bpEqKey "MINUS" and (EQCAR($stok,"INTEGER") or bpTrap()) and
bpPush MINUS $ttok and bpNext() or
bpSexpKey() or
MEMQ(shoeTokType $stok, '(ID INTEGER STRING FLOAT))
and bpPush $ttok and bpNext()
bpSexp()==
bpAnyId() or
bpEqKey "QUOTE" and (bpSexp() or bpTrap())
and bpPush bfSymbol bpPop1() or
bpIndentParenthesized function bpSexp1
bpSexp1()== bpFirstTok() and
bpSexp() and
(bpEqKey "DOT" and bpSexp() and bpPush [bpPop2(),:bpPop1()] or
bpSexp1() and bpPush [bpPop2(),:bpPop1()]) or
bpPush nil
bpPrimary1() ==
bpName() or
bpDot() or
bpConstTok() or
bpConstruct() or
bpCase() or
bpStruct() or
bpPDefinition() or
bpBPileDefinition()
bpPrimary()== bpFirstTok() and (bpPrimary1() or bpPrefixOperator())
bpDot()== bpEqKey "DOT" and bpPush bfDot ()
bpPrefixOperator()==
EQCAR( $stok,"KEY") and
GET($ttok,"SHOEPRE") and bpPushId() and bpNext()
bpInfixOperator()==
EQCAR( $stok,"KEY") and
GET($ttok,"SHOEINF") and bpPushId() and bpNext()
bpSelector()==
bpEqKey "DOT" and (bpPrimary()
and bpPush(bfElt(bpPop2(),bpPop1()))
or bpPush bfSuffixDot bpPop1() )
bpOperator()== bpPrimary() and bpAnyNo function bpSelector
bpApplication()==
bpPrimary() and bpAnyNo function bpSelector and
(bpApplication() and
bpPush(bfApplication(bpPop2(),bpPop1())) or true)
++ Typing:
++ SimpleType
++ Mapping
bpTyping() ==
bpApplication() and
(bpEqKey "ARROW" and (bpApplication() or bpTrap()) and
bpPush %Mapping(bpPop1(), bfUntuple bpPop1()) or true) or bpMapping()
++ Tagged:
++ Name : Typing
bpTagged()==
bpApplication() and
(bpEqKey "COLON" and (bpTyping() or bpTrap()) and
bpPush bfTagged(bpPop2(),bpPop1()) or true)
bpExpt()== bpRightAssoc('(POWER),function bpTagged)
bpInfKey s==
EQCAR( $stok,"KEY") and
MEMBER($ttok,s) and bpPushId() and bpNext()
bpInfGeneric s== bpInfKey s and (bpEqKey "BACKSET" or true)
bpRightAssoc(o,p)==
a:=bpState()
if apply(p,nil)
then
while bpInfGeneric o and (bpRightAssoc(o,p) or bpTrap()) repeat
bpPush bfInfApplication(bpPop2(),bpPop2(),bpPop1())
true
else
bpRestore a
false
bpLeftAssoc(operations,parser)==
if apply(parser,nil)
then
while bpInfGeneric(operations) and
(apply(parser,nil) or bpTrap())
repeat
bpPush bfInfApplication(bpPop2(),bpPop2(),bpPop1())
true
else false
bpString()==
EQ(shoeTokType $stok,"STRING") and
bpPush(["QUOTE",INTERN $ttok]) and bpNext()
bpThetaName() ==
if EQCAR( $stok,"ID") and GET($ttok,"SHOETHETA")
then
bpPushId()
bpNext()
else false
bpReduceOperator()==
bpInfixOperator() or bpString()
or bpThetaName()
bpReduce()==
a:=bpState()
if bpReduceOperator() and bpEqKey "SLASH"
then
bpEqPeek "OBRACK" => (bpDConstruct() or bpTrap()) and
bpPush bfReduceCollect(bpPop2(),bpPop1())
(bpApplication() or bpTrap()) and
bpPush bfReduce(bpPop2(),bpPop1())
else
bpRestore a
false
bpTimes()==
bpReduce() or bpLeftAssoc('(TIMES SLASH),function bpExpt)
bpMinus()==
bpInfGeneric '(MINUS) and (bpTimes() or bpTrap())
and bpPush(bfApplication(bpPop2(),bpPop1()))
or bpTimes()
bpArith()==bpLeftAssoc('(PLUS MINUS),function bpMinus)
bpIs()==
bpArith() and (bpInfKey '(IS ISNT) and (bpPattern() or bpTrap())
and bpPush bfISApplication(bpPop2(),bpPop2(),bpPop1())
or true)
bpBracketConstruct(f)==
bpBracket f and bpPush bfConstruct bpPop1 ()
bpCompare()==
bpIs() and (bpInfKey '(SHOEEQ SHOENE LT LE GT GE IN)
and (bpIs() or bpTrap())
and bpPush bfInfApplication(bpPop2(),bpPop2(),bpPop1())
or true)
bpAnd()== bpLeftAssoc('(AND),function bpCompare)
bpThrow() ==
bpEqKey "THROW" and bpApplication() and
bpPush bfThrow bpPop1()
++ Try:
++ try Assign CatchItems
bpTry() ==
bpEqKey "TRY" and bpAssign() and
(bpEqKey "BACKSET" or true) and
(bpEqKey "CATCH" or bpMissing "CATCH") and
(bpPiledCatchItems() or bpSimpleCatch() or bpTrap()) and
bpPush bfTry(bpPop2(), bpPop1())
++ SimpleCatch:
++ catch Name
bpSimpleCatch() ==
bpCatchItem() and bpPush [bpPop1()]
bpPiledCatchItems() ==
bpPileBracketed function bpCatchItemList
bpCatchItemList() ==
bpListAndRecover function bpCatchItem
bpExceptionHead() ==
(bpName() or bpTrap()) and
((bpParenthesized function bpIdList and
bpPush bfNameArgs (bpPop2(),bpPop1()))
or bpName() and bpPush bfNameArgs(bpPop2(),bpPop1()))
or true
bpExceptionTail() ==
bpEqKey "EXIT" and (bpAssign() or bpTrap()) and
bpPush Exit(bpPop2(),bpPop1())
++ Exception:
++ ExpcetionHead
++ ExceptionHead => Assign
bpException() ==
bpExceptionHead() and (bpExceptionTail() or true)
++ Catch:
++ catch Exception
bpCatchItem() ==
(bpException() or bpTrap()) and
bpPush %Catch bpPop1()
++ Return:
++ RETURN Assign
bpReturn()==
(bpEqKey "RETURN" and (bpAssign() or bpTrap()) and
bpPush bfReturnNoName bpPop1())
or bpThrow()
or bpAnd()
bpLogical()== bpLeftAssoc('(OR),function bpReturn)
bpExpression()==
bpEqKey "COLON" and (bpLogical() and
bpPush bfApplication ("COLON",bpPop1())
or bpTrap()) or bpLogical()
bpStatement()==
bpConditional function bpWhere or bpLoop()
or bpExpression()
or bpTry()
bpLoop()==
bpIterators() and
(bpCompMissing "REPEAT" and
(bpWhere() or bpTrap()) and
bpPush bfLp(bpPop2(),bpPop1()))
or
bpEqKey "REPEAT" and (bpLogical() or bpTrap()) and
bpPush bfLoop1 bpPop1 ()
bpSuchThat()==bpAndOr("BAR",function bpWhere,function bfSuchthat)
bpWhile()==bpAndOr ("WHILE",function bpLogical,function bfWhile)
bpUntil()==bpAndOr ("UNTIL",function bpLogical,function bfUntil)
bpForIn()==
bpEqKey "FOR" and (bpVariable() or bpTrap()) and (bpCompMissing "IN")
and ((bpSeg() or bpTrap()) and
(bpEqKey "BY" and (bpArith() or bpTrap()) and
bpPush bfForInBy(bpPop3(),bpPop2(),bpPop1())) or
bpPush bfForin(bpPop2(),bpPop1()))
bpSeg()==
bpArith() and
(bpEqKey "SEG" and
(bpArith() and bpPush(bfSegment2(bpPop2(),bpPop1()))
or bpPush(bfSegment1(bpPop1()))) or true)
bpIterator()==
bpForIn() or bpSuchThat() or bpWhile() or bpUntil()
bpIteratorList()==bpOneOrMore function bpIterator
and bpPush bfIterators bpPop1 ()
bpCrossBackSet()== bpEqKey "CROSS" and (bpEqKey "BACKSET" or true)
bpIterators()==
bpListofFun(function bpIteratorList,
function bpCrossBackSet,function bfCross)
bpAssign()==
a:=bpState()
if bpStatement()
then
if bpEqPeek "BEC"
then
bpRestore a
bpAssignment() or bpTrap()
else true
else
bpRestore a
false
bpAssignment()==
bpAssignVariable() and
bpEqKey "BEC" and
(bpAssign() or bpTrap()) and
bpPush bfAssign (bpPop2(),bpPop1())
-- should only be allowed in sequences
bpExit()==
bpAssign() and (bpEqKey "EXIT" and
((bpWhere() or bpTrap()) and
bpPush bfExit (bpPop2(),bpPop1()))
or true)
++ returns true if the next token introduces a definition.
bpBeginDefinition() ==
bpEqPeek "DEF" or
$sawParenthesizedHead and bpEqPeek "COLON"
bpDefinition()==
a:=bpState()
bpExit() =>
bpBeginDefinition() =>
bpRestore a
bpDef()
bpEqPeek "TDEF" =>
bpRestore a
bpTypeAliasDefition()
bpEqPeek "MDEF" =>
bpRestore a
bpMdef()
true
bpRestore a
false
bpStoreName()==
$op := first $stack
$wheredefs := nil
$typings := nil
$returnType := true -- assume we may return anything
true
bpReturnType() ==
-- a return type is acceptable for a function definition only
-- if its parameters are written in round parenthesis.
-- In particular, we reject the situation `foo x:Integer == ...'
$sawParenthesizedHead and bpEqKey "COLON" =>
bpApplication() or bpTrap()
$returnType := bpPop1()
true
true
bpDef() ==
bpName() and bpStoreName() and
bpDefTail() and bpPush bfCompDef bpPop1 ()
bpDDef() == bpName() and bpDefTail()
++ Parse the remaining of a simple definition.
bpSimpleDefinitionTail() ==
bpEqKey "DEF" and
(bpWhere() or bpTrap())
and bpPush bfSimpleDefinition(bpPop2(), bpPop1())
++ Parse the remaining of a compound definition.
bpCompoundDefinitionTail() ==
bpVariable() and bpReturnType() and
bpEqKey "DEF" and (bpWhere() or bpTrap())
and bpPush bfDefinition(bpPop3(),bpPop2(),bpPop1())
++ Parse the remainding of a definition. When we reach this point
++ we know we must parse a definition and we have already parsed
++ the name of the main operator in the definition.
bpDefTail() ==
bpSimpleDefinitionTail()
or bpCompoundDefinitionTail()
bpMDefTail()==
-- bpEqKey "MDEF" and
-- (bpWhere() or bpTrap())
-- and bpPush bfMDefinition1(bpPop2(),bpPop1())
-- or
(bpVariable() or bpTrap()) and
bpEqKey "MDEF" and (bpWhere() or bpTrap())
and bpPush bfMDefinition(bpPop3(),bpPop2(),bpPop1())
bpMdef()== bpName() and bpStoreName() and bpMDefTail()
bpWhere()==
bpDefinition() and
(bpEqKey "WHERE" and (bpDefinitionItem() or bpTrap())
and bpPush bfWhere(bpPop1(),bpPop1()) or true)
bpDefinitionItem()==
a:=bpState()
if bpDDef()
then true
else
bpRestore a
if bpBDefinitionPileItems()
then true
else
bpRestore a
if bpPDefinitionItems()
then true
else
bpRestore a
bpWhere()
bpDefinitionPileItems()==
bpListAndRecover function bpDefinitionItem
and bpPush bfDefSequence bpPop1()
bpBDefinitionPileItems()== bpPileBracketed function bpDefinitionPileItems
bpSemiColonDefinition()==bpSemiListing
(function bpDefinitionItem,function bfDefSequence)
bpPDefinitionItems()==bpParenthesized function bpSemiColonDefinition
bpComma()==
bpModule() or bpImport() or bpNamespace() or
bpTuple function bpWhere
bpTuple(p)==bpListofFun(p,function bpCommaBackSet,function bfTuple)
bpCommaBackSet()== bpEqKey "COMMA" and (bpEqKey "BACKSET" or true)
bpSemiColon()==bpSemiListing (function bpComma,function bfSequence)
bpSemiListing(p,f)==bpListofFun(p,function bpSemiBackSet,f)
bpSemiBackSet()== bpEqKey "SEMICOLON" and (bpEqKey "BACKSET" or true)
bpPDefinition()== bpIndentParenthesized function bpSemiColon
bpPileItems()==
bpListAndRecover function bpSemiColon and bpPush bfSequence bpPop1()
bpBPileDefinition()== bpPileBracketed function bpPileItems
bpIteratorTail()==
(bpEqKey "REPEAT" or true) and bpIterators()
--bpExpression()== bpLogical()
bpConstruct()==bpBracket function bpConstruction
bpConstruction()==
bpComma() and
(bpIteratorTail() and
bpPush bfCollect (bpPop2(),bpPop1()) or
bpPush bfTupleConstruct bpPop1())
bpDConstruct()==bpBracket function bpDConstruction
bpDConstruction()==
bpComma() and
(bpIteratorTail() and
bpPush bfDCollect (bpPop2(),bpPop1()) or
bpPush bfDTuple bpPop1())
--PATTERN
--bpNameOrDot() == bpName() or bpDot() or bpEqual()
bpPattern()== bpBracketConstruct function bpPatternL
or bpName() or bpConstTok()
bpEqual()==
bpEqKey "SHOEEQ" and (bpApplication() or bpConstTok() or
bpTrap()) and bpPush bfEqual bpPop1()
bpRegularPatternItem() ==
bpEqual() or
bpConstTok() or bpDot() or
bpName() and
((bpEqKey "BEC" and (bpPattern() or bpTrap())
and bpPush bfAssign(bpPop2(),bpPop1())) or true)
or bpBracketConstruct function bpPatternL
bpRegularPatternItemL()==
bpRegularPatternItem() and bpPush [bpPop1()]
bpRegularList()==
bpListof(function bpRegularPatternItemL,"COMMA",function bfAppend)
bpPatternColon()==
bpEqKey "COLON" and (bpRegularPatternItem() or bpTrap())
and bpPush [bfColon bpPop1()]
-- only one colon
bpPatternL() == bpPatternList() and bpPush bfTuple bpPop1()
bpPatternList()==
if bpRegularPatternItemL()
then
while (bpEqKey "COMMA" and (bpRegularPatternItemL() or
(bpPatternTail()
and bpPush append(bpPop2(),bpPop1())
or bpTrap();false) )) repeat
bpPush append(bpPop2(),bpPop1())
true
else bpPatternTail()
bpPatternTail()==
bpPatternColon() and
(bpEqKey "COMMA" and (bpRegularList() or bpTrap())
and bpPush append (bpPop2(),bpPop1()) or true)
-- BOUND VARIABLE
++ We are parsing parameters in a function definition. We have
++ just seen a parameter name; we are attempting to see whether
++ it might be followed by a type annotation, or whether it actually
++ a form with a specific pattern structure, or whether it has
++ a default value.
bpRegularBVItemTail() ==
bpEqKey "COLON" and (bpApplication() or bpTrap()) and
bpPush bfTagged(bpPop2(), bpPop1())
or bpEqKey "BEC" and (bpPattern() or bpTrap()) and
bpPush bfAssign(bpPop2(),bpPop1())
or bpEqKey "IS" and (bpPattern() or bpTrap()) and
bpPush bfAssign(bpPop2(),bpPop1())
or bpEqKey "DEF" and (bpApplication() or bpTrap()) and
bpPush %DefaultValue(bpPop2(), bpPop1())
bpRegularBVItem() ==
bpBVString()
or bpConstTok()
or (bpName() and (bpRegularBVItemTail() or true))
or bpBracketConstruct function bpPatternL
bpBVString()==
EQ(shoeTokType $stok,"STRING") and
bpPush(["BVQUOTE",INTERN $ttok]) and bpNext()
bpRegularBVItemL() ==
bpRegularBVItem() and bpPush [bpPop1()]
bpColonName()==
bpEqKey "COLON" and (bpName() or bpBVString() or bpTrap())
-- at most one colon at end
bpBoundVariablelist()==
if bpRegularBVItemL()
then
while (bpEqKey "COMMA" and (bpRegularBVItemL() or
(bpColonName()
and bpPush bfColonAppend(bpPop2(),bpPop1())
or bpTrap();false) )) repeat
bpPush append(bpPop2(),bpPop1())
true
else bpColonName() and bpPush bfColonAppend(nil,bpPop1())
++ Mark the start of parameter list enclosed in round parenthesis
bpBeginParameterList() ==
$sawParenthesizedHead := false
true
++ Mark the end of parameter list enclosed in round parenthesis
bpEndParameterList() ==
$sawParenthesizedHead := true
bpVariable()==
bpBeginParameterList() and
bpParenthesized function bpBoundVariablelist and
bpPush bfTupleIf bpPop1() and bpEndParameterList()
or bpBracketConstruct function bpPatternL
or bpName() or bpConstTok()
bpAssignVariable()==
bpBracketConstruct function bpPatternL or bpAssignLHS()
bpAssignLHS()==
bpName() and (bpEqKey "COLON" and (bpApplication() or bpTrap())
and bpPush bfLocal(bpPop2(),bpPop1())
or bpEqKey "DOT" and bpList(function bpPrimary,"DOT",
function bfListOf)
and bpChecknull() and
bpPush bfTuple([bpPop2(),:bpPop1()])
or true)
bpChecknull()==
a:=bpPop1()
if null a
then bpTrap()
else bpPush a
bpStruct()==
bpEqKey "STRUCTURE" and
(bpName() or bpTrap()) and
(bpEqKey "DEF" or bpTrap()) and
bpTypeList() and bpPush bfStruct(bpPop2(),bpPop1())
bpTypeList() == bpPileBracketed function bpTypeItemList
or bpTerm function bpIdList and bpPush [bpPop1()]
bpTypeItem() ==
bpTerm function bpIdList
bpTypeItemList() ==
bpListAndRecover function bpTypeItem
bpTerm idListParser ==
(bpName() or bpTrap()) and
((bpParenthesized idListParser and
bpPush bfNameArgs (bpPop2(),bpPop1()))
or bpName() and bpPush bfNameArgs(bpPop2(),bpPop1()))
or bpPush(bfNameOnly bpPop1())
bpIdList()== bpTuple function bpName
bpCase()==
bpEqKey "CASE" and
(bpWhere() or bpTrap()) and
(bpEqKey "OF" or bpMissing "OF") and
bpPiledCaseItems()
bpPiledCaseItems()==
bpPileBracketed function bpCaseItemList and
bpPush bfCase(bpPop2(),bpPop1())
bpCaseItemList()==
bpListAndRecover function bpCaseItem
bpCasePatternVar() ==
bpName() or bpDot()
bpCasePatternVarList() ==
bpTuple function bpCasePatternVar
bpCaseItem()==
(bpTerm function bpCasePatternVarList or bpTrap()) and
(bpEqKey "EXIT" or bpTrap()) and
(bpWhere() or bpTrap()) and
bpPush bfCaseItem (bpPop2(),bpPop1())
|