| 1 | #
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| 2 | # Module Parse::Yapp::Driver
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| 3 | #
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| 4 | # This module is part of the Parse::Yapp package available on your
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| 5 | # nearest CPAN
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| 6 | #
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| 7 | # Any use of this module in a standalone parser make the included
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| 8 | # text under the same copyright as the Parse::Yapp module itself.
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| 9 | #
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| 10 | # This notice should remain unchanged.
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| 11 | #
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| 12 | # (c) Copyright 1998-2001 Francois Desarmenien, all rights reserved.
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| 13 | # (see the pod text in Parse::Yapp module for use and distribution rights)
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| 14 | #
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| 15 |
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| 16 | package Parse::Yapp::Driver;
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| 17 |
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| 18 | require 5.004;
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| 19 |
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| 20 | use strict;
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| 21 |
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| 22 | use vars qw ( $VERSION $COMPATIBLE $FILENAME );
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| 23 |
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| 24 | $VERSION = '1.05';
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| 25 | $COMPATIBLE = '0.07';
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| 26 | $FILENAME=__FILE__;
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| 27 |
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| 28 | use Carp;
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| 29 |
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| 30 | #Known parameters, all starting with YY (leading YY will be discarded)
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| 31 | my(%params)=(YYLEX => 'CODE', 'YYERROR' => 'CODE', YYVERSION => '',
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| 32 | YYRULES => 'ARRAY', YYSTATES => 'ARRAY', YYDEBUG => '');
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| 33 | #Mandatory parameters
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| 34 | my(@params)=('LEX','RULES','STATES');
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| 35 |
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| 36 | sub new {
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| 37 | my($class)=shift;
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| 38 | my($errst,$nberr,$token,$value,$check,$dotpos);
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| 39 | my($self)={ ERROR => \&_Error,
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| 40 | ERRST => \$errst,
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| 41 | NBERR => \$nberr,
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| 42 | TOKEN => \$token,
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| 43 | VALUE => \$value,
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| 44 | DOTPOS => \$dotpos,
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| 45 | STACK => [],
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| 46 | DEBUG => 0,
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| 47 | CHECK => \$check };
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| 48 |
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| 49 | _CheckParams( [], \%params, \@_, $self );
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| 50 |
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| 51 | exists($$self{VERSION})
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| 52 | and $$self{VERSION} < $COMPATIBLE
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| 53 | and croak "Yapp driver version $VERSION ".
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| 54 | "incompatible with version $$self{VERSION}:\n".
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| 55 | "Please recompile parser module.";
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| 56 |
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| 57 | ref($class)
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| 58 | and $class=ref($class);
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| 59 |
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| 60 | bless($self,$class);
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| 61 | }
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| 62 |
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| 63 | sub YYParse {
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| 64 | my($self)=shift;
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| 65 | my($retval);
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| 66 |
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| 67 | _CheckParams( \@params, \%params, \@_, $self );
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| 68 |
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| 69 | if($$self{DEBUG}) {
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| 70 | _DBLoad();
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| 71 | $retval = eval '$self->_DBParse()';#Do not create stab entry on compile
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| 72 | $@ and die $@;
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| 73 | }
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| 74 | else {
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| 75 | $retval = $self->_Parse();
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| 76 | }
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| 77 | $retval
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| 78 | }
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| 79 |
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| 80 | sub YYData {
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| 81 | my($self)=shift;
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| 82 |
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| 83 | exists($$self{USER})
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| 84 | or $$self{USER}={};
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| 85 |
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| 86 | $$self{USER};
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| 87 |
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| 88 | }
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| 89 |
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| 90 | sub YYErrok {
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| 91 | my($self)=shift;
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| 92 |
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| 93 | ${$$self{ERRST}}=0;
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| 94 | undef;
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| 95 | }
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| 96 |
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| 97 | sub YYNberr {
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| 98 | my($self)=shift;
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| 99 |
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| 100 | ${$$self{NBERR}};
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| 101 | }
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| 102 |
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| 103 | sub YYRecovering {
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| 104 | my($self)=shift;
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| 105 |
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| 106 | ${$$self{ERRST}} != 0;
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| 107 | }
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| 108 |
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| 109 | sub YYAbort {
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| 110 | my($self)=shift;
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| 111 |
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| 112 | ${$$self{CHECK}}='ABORT';
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| 113 | undef;
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| 114 | }
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| 115 |
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| 116 | sub YYAccept {
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| 117 | my($self)=shift;
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| 118 |
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| 119 | ${$$self{CHECK}}='ACCEPT';
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| 120 | undef;
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| 121 | }
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| 122 |
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| 123 | sub YYError {
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| 124 | my($self)=shift;
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| 125 |
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| 126 | ${$$self{CHECK}}='ERROR';
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| 127 | undef;
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| 128 | }
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| 129 |
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| 130 | sub YYSemval {
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| 131 | my($self)=shift;
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| 132 | my($index)= $_[0] - ${$$self{DOTPOS}} - 1;
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| 133 |
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| 134 | $index < 0
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| 135 | and -$index <= @{$$self{STACK}}
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| 136 | and return $$self{STACK}[$index][1];
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| 137 |
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| 138 | undef; #Invalid index
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| 139 | }
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| 140 |
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| 141 | sub YYCurtok {
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| 142 | my($self)=shift;
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| 143 |
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| 144 | @_
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| 145 | and ${$$self{TOKEN}}=$_[0];
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| 146 | ${$$self{TOKEN}};
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| 147 | }
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| 148 |
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| 149 | sub YYCurval {
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| 150 | my($self)=shift;
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| 151 |
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| 152 | @_
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| 153 | and ${$$self{VALUE}}=$_[0];
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| 154 | ${$$self{VALUE}};
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| 155 | }
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| 156 |
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| 157 | sub YYExpect {
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| 158 | my($self)=shift;
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| 159 |
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| 160 | keys %{$self->{STATES}[$self->{STACK}[-1][0]]{ACTIONS}}
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| 161 | }
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| 162 |
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| 163 | sub YYLexer {
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| 164 | my($self)=shift;
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| 165 |
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| 166 | $$self{LEX};
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| 167 | }
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| 168 |
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| 169 |
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| 170 | #################
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| 171 | # Private stuff #
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| 172 | #################
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| 173 |
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| 174 |
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| 175 | sub _CheckParams {
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| 176 | my($mandatory,$checklist,$inarray,$outhash)=@_;
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| 177 | my($prm,$value);
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| 178 | my($prmlst)={};
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| 179 |
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| 180 | while(($prm,$value)=splice(@$inarray,0,2)) {
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| 181 | $prm=uc($prm);
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| 182 | exists($$checklist{$prm})
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| 183 | or croak("Unknow parameter '$prm'");
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| 184 | ref($value) eq $$checklist{$prm}
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| 185 | or croak("Invalid value for parameter '$prm'");
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| 186 | $prm=unpack('@2A*',$prm);
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| 187 | $$outhash{$prm}=$value;
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| 188 | }
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| 189 | for (@$mandatory) {
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| 190 | exists($$outhash{$_})
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| 191 | or croak("Missing mandatory parameter '".lc($_)."'");
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| 192 | }
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| 193 | }
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| 194 |
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| 195 | sub _Error {
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| 196 | print "Parse error.\n";
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| 197 | }
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| 198 |
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| 199 | sub _DBLoad {
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| 200 | {
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| 201 | no strict 'refs';
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| 202 |
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| 203 | exists(${__PACKAGE__.'::'}{_DBParse})#Already loaded ?
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| 204 | and return;
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| 205 | }
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| 206 | my($fname)=__FILE__;
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| 207 | my(@drv);
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| 208 | open(DRV,"<$fname") or die "Report this as a BUG: Cannot open $fname";
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| 209 | while(<DRV>) {
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| 210 | /^\s*sub\s+_Parse\s*{\s*$/ .. /^\s*}\s*#\s*_Parse\s*$/
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| 211 | and do {
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| 212 | s/^#DBG>//;
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| 213 | push(@drv,$_);
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| 214 | }
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| 215 | }
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| 216 | close(DRV);
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| 217 |
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| 218 | $drv[0]=~s/_P/_DBP/;
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| 219 | eval join('',@drv);
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| 220 | }
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| 221 |
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| 222 | #Note that for loading debugging version of the driver,
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| 223 | #this file will be parsed from 'sub _Parse' up to '}#_Parse' inclusive.
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| 224 | #So, DO NOT remove comment at end of sub !!!
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| 225 | sub _Parse {
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| 226 | my($self)=shift;
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| 227 |
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| 228 | my($rules,$states,$lex,$error)
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| 229 | = @$self{ 'RULES', 'STATES', 'LEX', 'ERROR' };
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| 230 | my($errstatus,$nberror,$token,$value,$stack,$check,$dotpos)
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| 231 | = @$self{ 'ERRST', 'NBERR', 'TOKEN', 'VALUE', 'STACK', 'CHECK', 'DOTPOS' };
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| 232 |
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| 233 | #DBG> my($debug)=$$self{DEBUG};
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| 234 | #DBG> my($dbgerror)=0;
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| 235 |
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| 236 | #DBG> my($ShowCurToken) = sub {
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| 237 | #DBG> my($tok)='>';
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| 238 | #DBG> for (split('',$$token)) {
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| 239 | #DBG> $tok.= (ord($_) < 32 or ord($_) > 126)
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| 240 | #DBG> ? sprintf('<%02X>',ord($_))
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| 241 | #DBG> : $_;
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| 242 | #DBG> }
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| 243 | #DBG> $tok.='<';
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| 244 | #DBG> };
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| 245 |
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| 246 | $$errstatus=0;
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| 247 | $$nberror=0;
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| 248 | ($$token,$$value)=(undef,undef);
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| 249 | @$stack=( [ 0, undef ] );
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| 250 | $$check='';
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| 251 |
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| 252 | while(1) {
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| 253 | my($actions,$act,$stateno);
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| 254 |
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| 255 | $stateno=$$stack[-1][0];
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| 256 | $actions=$$states[$stateno];
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| 257 |
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| 258 | #DBG> print STDERR ('-' x 40),"\n";
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| 259 | #DBG> $debug & 0x2
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| 260 | #DBG> and print STDERR "In state $stateno:\n";
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| 261 | #DBG> $debug & 0x08
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| 262 | #DBG> and print STDERR "Stack:[".
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| 263 | #DBG> join(',',map { $$_[0] } @$stack).
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| 264 | #DBG> "]\n";
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| 265 |
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| 266 |
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| 267 | if (exists($$actions{ACTIONS})) {
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| 268 |
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| 269 | defined($$token)
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| 270 | or do {
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| 271 | ($$token,$$value)=&$lex($self);
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| 272 | #DBG> $debug & 0x01
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| 273 | #DBG> and print STDERR "Need token. Got ".&$ShowCurToken."\n";
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| 274 | };
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| 275 |
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| 276 | $act= exists($$actions{ACTIONS}{$$token})
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| 277 | ? $$actions{ACTIONS}{$$token}
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| 278 | : exists($$actions{DEFAULT})
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| 279 | ? $$actions{DEFAULT}
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| 280 | : undef;
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| 281 | }
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| 282 | else {
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| 283 | $act=$$actions{DEFAULT};
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| 284 | #DBG> $debug & 0x01
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| 285 | #DBG> and print STDERR "Don't need token.\n";
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| 286 | }
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| 287 |
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| 288 | defined($act)
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| 289 | and do {
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| 290 |
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| 291 | $act > 0
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| 292 | and do { #shift
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| 293 |
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| 294 | #DBG> $debug & 0x04
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| 295 | #DBG> and print STDERR "Shift and go to state $act.\n";
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| 296 |
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| 297 | $$errstatus
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| 298 | and do {
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| 299 | --$$errstatus;
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| 300 |
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| 301 | #DBG> $debug & 0x10
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| 302 | #DBG> and $dbgerror
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| 303 | #DBG> and $$errstatus == 0
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| 304 | #DBG> and do {
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| 305 | #DBG> print STDERR "**End of Error recovery.\n";
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| 306 | #DBG> $dbgerror=0;
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| 307 | #DBG> };
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| 308 | };
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| 309 |
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| 310 |
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| 311 | push(@$stack,[ $act, $$value ]);
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| 312 |
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| 313 | $$token ne '' #Don't eat the eof
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| 314 | and $$token=$$value=undef;
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| 315 | next;
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| 316 | };
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| 317 |
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| 318 | #reduce
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| 319 | my($lhs,$len,$code,@sempar,$semval);
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| 320 | ($lhs,$len,$code)=@{$$rules[-$act]};
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| 321 |
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| 322 | #DBG> $debug & 0x04
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| 323 | #DBG> and $act
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| 324 | #DBG> and print STDERR "Reduce using rule ".-$act." ($lhs,$len): ";
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| 325 |
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| 326 | $act
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| 327 | or $self->YYAccept();
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| 328 |
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| 329 | $$dotpos=$len;
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| 330 |
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| 331 | unpack('A1',$lhs) eq '@' #In line rule
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| 332 | and do {
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| 333 | $lhs =~ /^\@[0-9]+\-([0-9]+)$/
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| 334 | or die "In line rule name '$lhs' ill formed: ".
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| 335 | "report it as a BUG.\n";
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| 336 | $$dotpos = $1;
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| 337 | };
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| 338 |
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| 339 | @sempar = $$dotpos
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| 340 | ? map { $$_[1] } @$stack[ -$$dotpos .. -1 ]
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| 341 | : ();
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| 342 |
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| 343 | $semval = $code ? &$code( $self, @sempar )
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| 344 | : @sempar ? $sempar[0] : undef;
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| 345 |
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| 346 | splice(@$stack,-$len,$len);
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| 347 |
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| 348 | $$check eq 'ACCEPT'
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| 349 | and do {
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| 350 |
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| 351 | #DBG> $debug & 0x04
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| 352 | #DBG> and print STDERR "Accept.\n";
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| 353 |
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| 354 | return($semval);
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| 355 | };
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| 356 |
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| 357 | $$check eq 'ABORT'
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| 358 | and do {
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| 359 |
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| 360 | #DBG> $debug & 0x04
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| 361 | #DBG> and print STDERR "Abort.\n";
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| 362 |
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| 363 | return(undef);
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| 364 |
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| 365 | };
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| 366 |
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| 367 | #DBG> $debug & 0x04
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| 368 | #DBG> and print STDERR "Back to state $$stack[-1][0], then ";
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| 369 |
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| 370 | $$check eq 'ERROR'
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| 371 | or do {
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| 372 | #DBG> $debug & 0x04
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| 373 | #DBG> and print STDERR
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| 374 | #DBG> "go to state $$states[$$stack[-1][0]]{GOTOS}{$lhs}.\n";
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| 375 |
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| 376 | #DBG> $debug & 0x10
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| 377 | #DBG> and $dbgerror
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| 378 | #DBG> and $$errstatus == 0
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| 379 | #DBG> and do {
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| 380 | #DBG> print STDERR "**End of Error recovery.\n";
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| 381 | #DBG> $dbgerror=0;
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| 382 | #DBG> };
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| 383 |
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| 384 | push(@$stack,
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| 385 | [ $$states[$$stack[-1][0]]{GOTOS}{$lhs}, $semval ]);
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| 386 | $$check='';
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| 387 | next;
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| 388 | };
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| 389 |
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| 390 | #DBG> $debug & 0x04
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| 391 | #DBG> and print STDERR "Forced Error recovery.\n";
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| 392 |
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| 393 | $$check='';
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| 394 |
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| 395 | };
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| 396 |
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| 397 | #Error
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| 398 | $$errstatus
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| 399 | or do {
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| 400 |
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| 401 | $$errstatus = 1;
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| 402 | &$error($self);
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| 403 | $$errstatus # if 0, then YYErrok has been called
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| 404 | or next; # so continue parsing
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| 405 |
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| 406 | #DBG> $debug & 0x10
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| 407 | #DBG> and do {
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| 408 | #DBG> print STDERR "**Entering Error recovery.\n";
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| 409 | #DBG> ++$dbgerror;
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| 410 | #DBG> };
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| 411 |
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| 412 | ++$$nberror;
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| 413 |
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| 414 | };
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| 415 |
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| 416 | $$errstatus == 3 #The next token is not valid: discard it
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| 417 | and do {
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| 418 | $$token eq '' # End of input: no hope
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| 419 | and do {
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| 420 | #DBG> $debug & 0x10
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| 421 | #DBG> and print STDERR "**At eof: aborting.\n";
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| 422 | return(undef);
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| 423 | };
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| 424 |
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| 425 | #DBG> $debug & 0x10
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| 426 | #DBG> and print STDERR "**Dicard invalid token ".&$ShowCurToken.".\n";
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| 427 |
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| 428 | $$token=$$value=undef;
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| 429 | };
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| 430 |
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| 431 | $$errstatus=3;
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| 432 |
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| 433 | while( @$stack
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| 434 | and ( not exists($$states[$$stack[-1][0]]{ACTIONS})
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| 435 | or not exists($$states[$$stack[-1][0]]{ACTIONS}{error})
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| 436 | or $$states[$$stack[-1][0]]{ACTIONS}{error} <= 0)) {
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| 437 |
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| 438 | #DBG> $debug & 0x10
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| 439 | #DBG> and print STDERR "**Pop state $$stack[-1][0].\n";
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| 440 |
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| 441 | pop(@$stack);
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| 442 | }
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| 443 |
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| 444 | @$stack
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| 445 | or do {
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| 446 |
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| 447 | #DBG> $debug & 0x10
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| 448 | #DBG> and print STDERR "**No state left on stack: aborting.\n";
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| 449 |
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| 450 | return(undef);
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| 451 | };
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| 452 |
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| 453 | #shift the error token
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| 454 |
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| 455 | #DBG> $debug & 0x10
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| 456 | #DBG> and print STDERR "**Shift \$error token and go to state ".
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| 457 | #DBG> $$states[$$stack[-1][0]]{ACTIONS}{error}.
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| 458 | #DBG> ".\n";
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| 459 |
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| 460 | push(@$stack, [ $$states[$$stack[-1][0]]{ACTIONS}{error}, undef ]);
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| 461 |
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| 462 | }
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| 463 |
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| 464 | #never reached
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| 465 | croak("Error in driver logic. Please, report it as a BUG");
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| 466 |
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| 467 | }#_Parse
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| 468 | #DO NOT remove comment
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| 469 |
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| 470 | 1;
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| 471 |
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