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-rw-r--r--pidl/lib/Parse/Yapp/Driver.pm471
1 files changed, 471 insertions, 0 deletions
diff --git a/pidl/lib/Parse/Yapp/Driver.pm b/pidl/lib/Parse/Yapp/Driver.pm
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+#
+# Module Parse::Yapp::Driver
+#
+# This module is part of the Parse::Yapp package available on your
+# nearest CPAN
+#
+# Any use of this module in a standalone parser make the included
+# text under the same copyright as the Parse::Yapp module itself.
+#
+# This notice should remain unchanged.
+#
+# (c) Copyright 1998-2001 Francois Desarmenien, all rights reserved.
+# (see the pod text in Parse::Yapp module for use and distribution rights)
+#
+
+package Parse::Yapp::Driver;
+
+require 5.004;
+
+use strict;
+
+use vars qw ( $VERSION $COMPATIBLE $FILENAME );
+
+$VERSION = '1.05';
+$COMPATIBLE = '0.07';
+$FILENAME=__FILE__;
+
+use Carp;
+
+#Known parameters, all starting with YY (leading YY will be discarded)
+my(%params)=(YYLEX => 'CODE', 'YYERROR' => 'CODE', YYVERSION => '',
+ YYRULES => 'ARRAY', YYSTATES => 'ARRAY', YYDEBUG => '');
+#Mandatory parameters
+my(@params)=('LEX','RULES','STATES');
+
+sub new {
+ my($class)=shift;
+ my($errst,$nberr,$token,$value,$check,$dotpos);
+ my($self)={ ERROR => \&_Error,
+ ERRST => \$errst,
+ NBERR => \$nberr,
+ TOKEN => \$token,
+ VALUE => \$value,
+ DOTPOS => \$dotpos,
+ STACK => [],
+ DEBUG => 0,
+ CHECK => \$check };
+
+ _CheckParams( [], \%params, \@_, $self );
+
+ exists($$self{VERSION})
+ and $$self{VERSION} < $COMPATIBLE
+ and croak "Yapp driver version $VERSION ".
+ "incompatible with version $$self{VERSION}:\n".
+ "Please recompile parser module.";
+
+ ref($class)
+ and $class=ref($class);
+
+ bless($self,$class);
+}
+
+sub YYParse {
+ my($self)=shift;
+ my($retval);
+
+ _CheckParams( \@params, \%params, \@_, $self );
+
+ if($$self{DEBUG}) {
+ _DBLoad();
+ $retval = eval '$self->_DBParse()';#Do not create stab entry on compile
+ $@ and die $@;
+ }
+ else {
+ $retval = $self->_Parse();
+ }
+ $retval
+}
+
+sub YYData {
+ my($self)=shift;
+
+ exists($$self{USER})
+ or $$self{USER}={};
+
+ $$self{USER};
+
+}
+
+sub YYErrok {
+ my($self)=shift;
+
+ ${$$self{ERRST}}=0;
+ undef;
+}
+
+sub YYNberr {
+ my($self)=shift;
+
+ ${$$self{NBERR}};
+}
+
+sub YYRecovering {
+ my($self)=shift;
+
+ ${$$self{ERRST}} != 0;
+}
+
+sub YYAbort {
+ my($self)=shift;
+
+ ${$$self{CHECK}}='ABORT';
+ undef;
+}
+
+sub YYAccept {
+ my($self)=shift;
+
+ ${$$self{CHECK}}='ACCEPT';
+ undef;
+}
+
+sub YYError {
+ my($self)=shift;
+
+ ${$$self{CHECK}}='ERROR';
+ undef;
+}
+
+sub YYSemval {
+ my($self)=shift;
+ my($index)= $_[0] - ${$$self{DOTPOS}} - 1;
+
+ $index < 0
+ and -$index <= @{$$self{STACK}}
+ and return $$self{STACK}[$index][1];
+
+ undef; #Invalid index
+}
+
+sub YYCurtok {
+ my($self)=shift;
+
+ @_
+ and ${$$self{TOKEN}}=$_[0];
+ ${$$self{TOKEN}};
+}
+
+sub YYCurval {
+ my($self)=shift;
+
+ @_
+ and ${$$self{VALUE}}=$_[0];
+ ${$$self{VALUE}};
+}
+
+sub YYExpect {
+ my($self)=shift;
+
+ keys %{$self->{STATES}[$self->{STACK}[-1][0]]{ACTIONS}}
+}
+
+sub YYLexer {
+ my($self)=shift;
+
+ $$self{LEX};
+}
+
+
+#################
+# Private stuff #
+#################
+
+
+sub _CheckParams {
+ my($mandatory,$checklist,$inarray,$outhash)=@_;
+ my($prm,$value);
+ my($prmlst)={};
+
+ while(($prm,$value)=splice(@$inarray,0,2)) {
+ $prm=uc($prm);
+ exists($$checklist{$prm})
+ or croak("Unknow parameter '$prm'");
+ ref($value) eq $$checklist{$prm}
+ or croak("Invalid value for parameter '$prm'");
+ $prm=unpack('@2A*',$prm);
+ $$outhash{$prm}=$value;
+ }
+ for (@$mandatory) {
+ exists($$outhash{$_})
+ or croak("Missing mandatory parameter '".lc($_)."'");
+ }
+}
+
+sub _Error {
+ print "Parse error.\n";
+}
+
+sub _DBLoad {
+ {
+ no strict 'refs';
+
+ exists(${__PACKAGE__.'::'}{_DBParse})#Already loaded ?
+ and return;
+ }
+ my($fname)=__FILE__;
+ my(@drv);
+ open(DRV,"<$fname") or die "Report this as a BUG: Cannot open $fname";
+ while(<DRV>) {
+ /^\s*sub\s+_Parse\s*{\s*$/ .. /^\s*}\s*#\s*_Parse\s*$/
+ and do {
+ s/^#DBG>//;
+ push(@drv,$_);
+ }
+ }
+ close(DRV);
+
+ $drv[0]=~s/_P/_DBP/;
+ eval join('',@drv);
+}
+
+#Note that for loading debugging version of the driver,
+#this file will be parsed from 'sub _Parse' up to '}#_Parse' inclusive.
+#So, DO NOT remove comment at end of sub !!!
+sub _Parse {
+ my($self)=shift;
+
+ my($rules,$states,$lex,$error)
+ = @$self{ 'RULES', 'STATES', 'LEX', 'ERROR' };
+ my($errstatus,$nberror,$token,$value,$stack,$check,$dotpos)
+ = @$self{ 'ERRST', 'NBERR', 'TOKEN', 'VALUE', 'STACK', 'CHECK', 'DOTPOS' };
+
+#DBG> my($debug)=$$self{DEBUG};
+#DBG> my($dbgerror)=0;
+
+#DBG> my($ShowCurToken) = sub {
+#DBG> my($tok)='>';
+#DBG> for (split('',$$token)) {
+#DBG> $tok.= (ord($_) < 32 or ord($_) > 126)
+#DBG> ? sprintf('<%02X>',ord($_))
+#DBG> : $_;
+#DBG> }
+#DBG> $tok.='<';
+#DBG> };
+
+ $$errstatus=0;
+ $$nberror=0;
+ ($$token,$$value)=(undef,undef);
+ @$stack=( [ 0, undef ] );
+ $$check='';
+
+ while(1) {
+ my($actions,$act,$stateno);
+
+ $stateno=$$stack[-1][0];
+ $actions=$$states[$stateno];
+
+#DBG> print STDERR ('-' x 40),"\n";
+#DBG> $debug & 0x2
+#DBG> and print STDERR "In state $stateno:\n";
+#DBG> $debug & 0x08
+#DBG> and print STDERR "Stack:[".
+#DBG> join(',',map { $$_[0] } @$stack).
+#DBG> "]\n";
+
+
+ if (exists($$actions{ACTIONS})) {
+
+ defined($$token)
+ or do {
+ ($$token,$$value)=&$lex($self);
+#DBG> $debug & 0x01
+#DBG> and print STDERR "Need token. Got ".&$ShowCurToken."\n";
+ };
+
+ $act= exists($$actions{ACTIONS}{$$token})
+ ? $$actions{ACTIONS}{$$token}
+ : exists($$actions{DEFAULT})
+ ? $$actions{DEFAULT}
+ : undef;
+ }
+ else {
+ $act=$$actions{DEFAULT};
+#DBG> $debug & 0x01
+#DBG> and print STDERR "Don't need token.\n";
+ }
+
+ defined($act)
+ and do {
+
+ $act > 0
+ and do { #shift
+
+#DBG> $debug & 0x04
+#DBG> and print STDERR "Shift and go to state $act.\n";
+
+ $$errstatus
+ and do {
+ --$$errstatus;
+
+#DBG> $debug & 0x10
+#DBG> and $dbgerror
+#DBG> and $$errstatus == 0
+#DBG> and do {
+#DBG> print STDERR "**End of Error recovery.\n";
+#DBG> $dbgerror=0;
+#DBG> };
+ };
+
+
+ push(@$stack,[ $act, $$value ]);
+
+ $$token ne '' #Don't eat the eof
+ and $$token=$$value=undef;
+ next;
+ };
+
+ #reduce
+ my($lhs,$len,$code,@sempar,$semval);
+ ($lhs,$len,$code)=@{$$rules[-$act]};
+
+#DBG> $debug & 0x04
+#DBG> and $act
+#DBG> and print STDERR "Reduce using rule ".-$act." ($lhs,$len): ";
+
+ $act
+ or $self->YYAccept();
+
+ $$dotpos=$len;
+
+ unpack('A1',$lhs) eq '@' #In line rule
+ and do {
+ $lhs =~ /^\@[0-9]+\-([0-9]+)$/
+ or die "In line rule name '$lhs' ill formed: ".
+ "report it as a BUG.\n";
+ $$dotpos = $1;
+ };
+
+ @sempar = $$dotpos
+ ? map { $$_[1] } @$stack[ -$$dotpos .. -1 ]
+ : ();
+
+ $semval = $code ? &$code( $self, @sempar )
+ : @sempar ? $sempar[0] : undef;
+
+ splice(@$stack,-$len,$len);
+
+ $$check eq 'ACCEPT'
+ and do {
+
+#DBG> $debug & 0x04
+#DBG> and print STDERR "Accept.\n";
+
+ return($semval);
+ };
+
+ $$check eq 'ABORT'
+ and do {
+
+#DBG> $debug & 0x04
+#DBG> and print STDERR "Abort.\n";
+
+ return(undef);
+
+ };
+
+#DBG> $debug & 0x04
+#DBG> and print STDERR "Back to state $$stack[-1][0], then ";
+
+ $$check eq 'ERROR'
+ or do {
+#DBG> $debug & 0x04
+#DBG> and print STDERR
+#DBG> "go to state $$states[$$stack[-1][0]]{GOTOS}{$lhs}.\n";
+
+#DBG> $debug & 0x10
+#DBG> and $dbgerror
+#DBG> and $$errstatus == 0
+#DBG> and do {
+#DBG> print STDERR "**End of Error recovery.\n";
+#DBG> $dbgerror=0;
+#DBG> };
+
+ push(@$stack,
+ [ $$states[$$stack[-1][0]]{GOTOS}{$lhs}, $semval ]);
+ $$check='';
+ next;
+ };
+
+#DBG> $debug & 0x04
+#DBG> and print STDERR "Forced Error recovery.\n";
+
+ $$check='';
+
+ };
+
+ #Error
+ $$errstatus
+ or do {
+
+ $$errstatus = 1;
+ &$error($self);
+ $$errstatus # if 0, then YYErrok has been called
+ or next; # so continue parsing
+
+#DBG> $debug & 0x10
+#DBG> and do {
+#DBG> print STDERR "**Entering Error recovery.\n";
+#DBG> ++$dbgerror;
+#DBG> };
+
+ ++$$nberror;
+
+ };
+
+ $$errstatus == 3 #The next token is not valid: discard it
+ and do {
+ $$token eq '' # End of input: no hope
+ and do {
+#DBG> $debug & 0x10
+#DBG> and print STDERR "**At eof: aborting.\n";
+ return(undef);
+ };
+
+#DBG> $debug & 0x10
+#DBG> and print STDERR "**Dicard invalid token ".&$ShowCurToken.".\n";
+
+ $$token=$$value=undef;
+ };
+
+ $$errstatus=3;
+
+ while( @$stack
+ and ( not exists($$states[$$stack[-1][0]]{ACTIONS})
+ or not exists($$states[$$stack[-1][0]]{ACTIONS}{error})
+ or $$states[$$stack[-1][0]]{ACTIONS}{error} <= 0)) {
+
+#DBG> $debug & 0x10
+#DBG> and print STDERR "**Pop state $$stack[-1][0].\n";
+
+ pop(@$stack);
+ }
+
+ @$stack
+ or do {
+
+#DBG> $debug & 0x10
+#DBG> and print STDERR "**No state left on stack: aborting.\n";
+
+ return(undef);
+ };
+
+ #shift the error token
+
+#DBG> $debug & 0x10
+#DBG> and print STDERR "**Shift \$error token and go to state ".
+#DBG> $$states[$$stack[-1][0]]{ACTIONS}{error}.
+#DBG> ".\n";
+
+ push(@$stack, [ $$states[$$stack[-1][0]]{ACTIONS}{error}, undef ]);
+
+ }
+
+ #never reached
+ croak("Error in driver logic. Please, report it as a BUG");
+
+}#_Parse
+#DO NOT remove comment
+
+1;
+
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