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|
$yysccsid = "@(#)yaccpar 1.8 (Berkeley) 01/20/91 (Perl 2.0 12/31/92)";
#define YYBYACC 1
$INT=257;
$FLOAT=258;
$STRING=259;
$IDENT=260;
$EQ=261;
$NE=262;
$GT=263;
$GE=264;
$LT=265;
$LE=266;
$L_SHIFT=267;
$R_SHIFT=268;
$EXP=269;
$UNARY=270;
$YYERRCODE=256;
@yylhs = ( -1,
0, 0, 1, 1, 1, 2, 2, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3,
);
@yylen = ( 2,
0, 2, 1, 2, 2, 1, 1, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 2, 2, 2, 2, 2, 3, 1,
1, 1, 1, 1,
);
@yydefred = ( 1,
0, 0, 31, 32, 33, 0, 0, 0, 0, 0,
6, 7, 0, 34, 2, 3, 0, 5, 0, 28,
27, 25, 26, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 24,
4, 0, 8, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
);
@yydgoto = ( 1,
15, 16, 17,
);
@yysindex = ( 0,
147, 30, 0, 0, 0, -60, -257, 375, 375, 375,
0, 0, 375, 0, 0, 0, 1, 0, 375, 0,
0, 0, 0, -28, 375, 375, 375, 375, 375, 375,
375, 375, 375, 375, 375, 375, 375, 375, 375, 0,
0, 166, 0, 130, 183, 301, 301, 109, 109, 109,
109, 172, 172, -26, -26, -27, -27, -27,
);
@yyrindex = ( 0,
0, 0, 0, 0, 0, -10, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 41, 0, 190, 78, 120, 124, 88, 94, 100,
108, 65, 74, 42, 54, 12, 20, 31,
);
@yygindex = ( 0,
0, 7, 445,
);
$YYTABLESIZE=635;
@yytable = ( 30,
19, 20, 0, 0, 40, 40, 40, 0, 18, 26,
12, 0, 43, 37, 35, 37, 36, 0, 38, 0,
38, 21, 30, 41, 0, 0, 0, 30, 0, 22,
30, 30, 30, 40, 30, 0, 30, 0, 26, 12,
23, 0, 37, 35, 0, 36, 0, 38, 30, 21,
29, 19, 21, 21, 21, 0, 21, 22, 21, 11,
22, 22, 22, 20, 22, 0, 22, 0, 23, 0,
21, 23, 23, 23, 17, 23, 0, 23, 22, 19,
0, 29, 19, 18, 19, 0, 19, 10, 11, 23,
0, 20, 0, 0, 20, 25, 20, 13, 20, 29,
19, 0, 17, 14, 0, 17, 0, 0, 0, 15,
0, 18, 20, 30, 18, 10, 0, 16, 10, 0,
0, 0, 0, 17, 25, 13, 0, 0, 13, 11,
0, 14, 18, 12, 14, 21, 10, 15, 0, 0,
15, 40, 0, 22, 0, 16, 13, 0, 16, 0,
37, 35, 14, 36, 23, 38, 12, 11, 15, 0,
11, 12, 40, 0, 12, 19, 16, 26, 0, 0,
0, 37, 35, 0, 36, 0, 38, 20, 11, 10,
0, 0, 12, 14, 7, 0, 13, 0, 17, 8,
0, 9, 0, 0, 0, 0, 0, 18, 40, 9,
0, 10, 0, 26, 40, 11, 0, 37, 35, 0,
36, 13, 38, 37, 35, 40, 36, 14, 38, 0,
0, 0, 0, 15, 37, 35, 0, 36, 0, 38,
9, 16, 27, 28, 29, 30, 31, 32, 33, 34,
39, 39, 39, 11, 0, 0, 0, 12, 9, 0,
30, 30, 30, 30, 30, 30, 30, 30, 30, 0,
0, 27, 28, 29, 30, 31, 32, 33, 34, 39,
0, 0, 21, 21, 21, 21, 21, 21, 21, 21,
22, 22, 22, 22, 22, 22, 22, 22, 0, 25,
0, 23, 23, 23, 23, 23, 23, 23, 23, 0,
0, 0, 19, 19, 19, 19, 19, 19, 19, 19,
0, 0, 0, 9, 20, 20, 20, 20, 20, 20,
20, 20, 0, 0, 0, 17, 17, 17, 17, 17,
17, 17, 17, 40, 18, 18, 18, 18, 18, 18,
18, 18, 37, 35, 0, 36, 0, 38, 13, 13,
13, 13, 13, 13, 14, 14, 14, 14, 14, 14,
15, 15, 15, 15, 15, 15, 0, 0, 16, 16,
16, 16, 16, 16, 0, 33, 34, 39, 0, 0,
11, 11, 0, 0, 12, 12, 0, 0, 0, 0,
27, 28, 29, 30, 31, 32, 33, 34, 39, 0,
0, 0, 2, 3, 4, 5, 6, 10, 0, 0,
0, 14, 7, 0, 13, 0, 0, 8, 0, 9,
0, 0, 0, 0, 0, 0, 27, 28, 29, 30,
31, 32, 33, 34, 39, 0, 0, 0, 0, 0,
39, 0, 0, 27, 28, 29, 30, 31, 32, 33,
34, 39, 21, 22, 23, 0, 0, 24, 0, 0,
0, 0, 0, 42, 0, 0, 0, 0, 0, 44,
45, 46, 47, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 29, 30, 31, 32, 33, 34, 39,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 3, 4, 5, 6,
);
@yycheck = ( 10,
61, 259, -1, -1, 33, 33, 33, -1, 2, 38,
10, -1, 41, 42, 43, 42, 45, -1, 47, -1,
47, 10, 33, 17, -1, -1, -1, 38, -1, 10,
41, 42, 43, 33, 45, -1, 47, -1, 38, 10,
10, -1, 42, 43, -1, 45, -1, 47, 59, 38,
10, 10, 41, 42, 43, -1, 45, 38, 47, 59,
41, 42, 43, 10, 45, -1, 47, -1, 38, -1,
59, 41, 42, 43, 10, 45, -1, 47, 59, 38,
-1, 41, 41, 10, 43, -1, 45, 10, 59, 59,
-1, 38, -1, -1, 41, 124, 43, 10, 45, 59,
59, -1, 38, 10, -1, 41, -1, -1, -1, 10,
-1, 38, 59, 124, 41, 38, -1, 10, 41, -1,
-1, -1, -1, 59, 124, 38, -1, -1, 41, 10,
-1, 38, 59, 10, 41, 124, 59, 38, -1, -1,
41, 33, -1, 124, -1, 38, 59, -1, 41, -1,
42, 43, 59, 45, 124, 47, 10, 38, 59, -1,
41, 38, 33, -1, 41, 124, 59, 38, -1, -1,
-1, 42, 43, -1, 45, -1, 47, 124, 59, 33,
-1, -1, 59, 37, 38, -1, 40, -1, 124, 43,
-1, 45, -1, -1, -1, -1, -1, 124, 33, 10,
-1, 124, -1, 38, 33, 59, -1, 42, 43, -1,
45, 124, 47, 42, 43, 33, 45, 124, 47, -1,
-1, -1, -1, 124, 42, 43, -1, 45, -1, 47,
41, 124, 261, 262, 263, 264, 265, 266, 267, 268,
269, 269, 269, 124, -1, -1, -1, 124, 59, -1,
261, 262, 263, 264, 265, 266, 267, 268, 269, -1,
-1, 261, 262, 263, 264, 265, 266, 267, 268, 269,
-1, -1, 261, 262, 263, 264, 265, 266, 267, 268,
261, 262, 263, 264, 265, 266, 267, 268, -1, 124,
-1, 261, 262, 263, 264, 265, 266, 267, 268, -1,
-1, -1, 261, 262, 263, 264, 265, 266, 267, 268,
-1, -1, -1, 124, 261, 262, 263, 264, 265, 266,
267, 268, -1, -1, -1, 261, 262, 263, 264, 265,
266, 267, 268, 33, 261, 262, 263, 264, 265, 266,
267, 268, 42, 43, -1, 45, -1, 47, 261, 262,
263, 264, 265, 266, 261, 262, 263, 264, 265, 266,
261, 262, 263, 264, 265, 266, -1, -1, 261, 262,
263, 264, 265, 266, -1, 267, 268, 269, -1, -1,
261, 262, -1, -1, 261, 262, -1, -1, -1, -1,
261, 262, 263, 264, 265, 266, 267, 268, 269, -1,
-1, -1, 256, 257, 258, 259, 260, 33, -1, -1,
-1, 37, 38, -1, 40, -1, -1, 43, -1, 45,
-1, -1, -1, -1, -1, -1, 261, 262, 263, 264,
265, 266, 267, 268, 269, -1, -1, -1, -1, -1,
269, -1, -1, 261, 262, 263, 264, 265, 266, 267,
268, 269, 8, 9, 10, -1, -1, 13, -1, -1,
-1, -1, -1, 19, -1, -1, -1, -1, -1, 25,
26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 38, 39, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, 263, 264, 265, 266, 267, 268, 269,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 257, 258, 259, 260,
);
$YYFINAL=1;
#ifndef YYDEBUG
#define YYDEBUG 0
#endif
$YYMAXTOKEN=270;
#if YYDEBUG
@yyname = (
"end-of-file",'','','','','','','','','',"'\\n'",'','','','','','','','','','','','','','','','','','','','',
'','',"'!'",'','','',"'%'","'&'",'',"'('","')'","'*'","'+'",'',"'-'",'',"'/'",'','','','','',
'','','','','','',"';'",'',"'='",'','','','','','','','','','','','','','','','','','','','','','','','','','','',
'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',"'|'",'','',
'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',
'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',
'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',
'','','','','','','','','','',"INT","FLOAT","STRING","IDENT","EQ","NE","GT","GE","LT",
"LE","L_SHIFT","R_SHIFT","EXP","UNARY",
);
@yyrule = (
"\$accept : stmt_list",
"stmt_list :",
"stmt_list : stmt_list stmt",
"stmt : terminator",
"stmt : expr terminator",
"stmt : error terminator",
"terminator : ';'",
"terminator : '\\n'",
"expr : '(' expr ')'",
"expr : expr '|' expr",
"expr : expr '&' expr",
"expr : expr EQ expr",
"expr : expr NE expr",
"expr : expr GT expr",
"expr : expr GE expr",
"expr : expr LT expr",
"expr : expr LE expr",
"expr : expr L_SHIFT expr",
"expr : expr R_SHIFT expr",
"expr : expr '+' expr",
"expr : expr '-' expr",
"expr : expr '*' expr",
"expr : expr '/' expr",
"expr : expr EXP expr",
"expr : expr '!'",
"expr : '-' expr",
"expr : '!' expr",
"expr : '+' expr",
"expr : '&' STRING",
"expr : IDENT '=' expr",
"expr : IDENT",
"expr : INT",
"expr : FLOAT",
"expr : STRING",
"expr : '%'",
);
#endif
sub yyclearin { $yychar = -1; }
sub yyerrok { $yyerrflag = 0; }
$YYSTACKSIZE = $YYSTACKSIZE || $YYMAXDEPTH || 500;
$YYMAXDEPTH = $YYMAXDEPTH || $YYSTACKSIZE || 500;
$yyss[$YYSTACKSIZE] = 0;
$yyvs[$YYSTACKSIZE] = 0;
sub YYERROR { ++$yynerrs; &yy_err_recover; }
sub yy_err_recover
{
if ($yyerrflag < 3)
{
$yyerrflag = 3;
while (1)
{
if (($yyn = $yysindex[$yyss[$yyssp]]) &&
($yyn += $YYERRCODE) >= 0 &&
$yycheck[$yyn] == $YYERRCODE)
{
#if YYDEBUG
print "yydebug: state $yyss[$yyssp], error recovery shifting",
" to state $yytable[$yyn]\n" if $yydebug;
#endif
$yyss[++$yyssp] = $yystate = $yytable[$yyn];
$yyvs[++$yyvsp] = $yylval;
next yyloop;
}
else
{
#if YYDEBUG
print "yydebug: error recovery discarding state ",
$yyss[$yyssp], "\n" if $yydebug;
#endif
return(1) if $yyssp <= 0;
--$yyssp;
--$yyvsp;
}
}
}
else
{
return (1) if $yychar == 0;
#if YYDEBUG
if ($yydebug)
{
$yys = '';
if ($yychar <= $YYMAXTOKEN) { $yys = $yyname[$yychar]; }
if (!$yys) { $yys = 'illegal-symbol'; }
print "yydebug: state $yystate, error recovery discards ",
"token $yychar ($yys)\n";
}
#endif
$yychar = -1;
next yyloop;
}
0;
} # yy_err_recover
sub yyparse
{
#ifdef YYDEBUG
if ($yys = $ENV{'YYDEBUG'})
{
$yydebug = int($1) if $yys =~ /^(\d)/;
}
#endif
$yynerrs = 0;
$yyerrflag = 0;
$yychar = (-1);
$yyssp = 0;
$yyvsp = 0;
$yyss[$yyssp] = $yystate = 0;
yyloop: while(1)
{
yyreduce: {
last yyreduce if ($yyn = $yydefred[$yystate]);
if ($yychar < 0)
{
if (($yychar = &yylex) < 0) { $yychar = 0; }
#if YYDEBUG
if ($yydebug)
{
$yys = '';
if ($yychar <= $#yyname) { $yys = $yyname[$yychar]; }
if (!$yys) { $yys = 'illegal-symbol'; };
print "yydebug: state $yystate, reading $yychar ($yys)\n";
}
#endif
}
if (($yyn = $yysindex[$yystate]) && ($yyn += $yychar) >= 0 &&
$yycheck[$yyn] == $yychar)
{
#if YYDEBUG
print "yydebug: state $yystate, shifting to state ",
$yytable[$yyn], "\n" if $yydebug;
#endif
$yyss[++$yyssp] = $yystate = $yytable[$yyn];
$yyvs[++$yyvsp] = $yylval;
$yychar = (-1);
--$yyerrflag if $yyerrflag > 0;
next yyloop;
}
if (($yyn = $yyrindex[$yystate]) && ($yyn += $yychar) >= 0 &&
$yycheck[$yyn] == $yychar)
{
$yyn = $yytable[$yyn];
last yyreduce;
}
if (! $yyerrflag) {
&yyerror('syntax error');
++$yynerrs;
}
return(1) if &yy_err_recover;
} # yyreduce
#if YYDEBUG
print "yydebug: state $yystate, reducing by rule ",
"$yyn ($yyrule[$yyn])\n" if $yydebug;
#endif
$yym = $yylen[$yyn];
$yyval = $yyvs[$yyvsp+1-$yym];
switch:
{
if ($yyn == 4) {
#line 45 "calc.y"
{ print $yyvs[$yyvsp-1], "\n" if $yyvs[$yyvsp-0] eq "\n"; $P = $yyvs[$yyvsp-1];
last switch;
} }
if ($yyn == 5) {
#line 47 "calc.y"
{ &yyerrok;
last switch;
} }
if ($yyn == 6) {
#line 51 "calc.y"
{ $yyval = $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 7) {
#line 53 "calc.y"
{ $yyval = $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 8) {
#line 57 "calc.y"
{ $yyval = $yyvs[$yyvsp-1];
last switch;
} }
if ($yyn == 9) {
#line 59 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] || $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 10) {
#line 61 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] && $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 11) {
#line 63 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] == $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 12) {
#line 65 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] != $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 13) {
#line 67 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] > $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 14) {
#line 69 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] >= $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 15) {
#line 71 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] < $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 16) {
#line 73 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] <= $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 17) {
#line 75 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] << $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 18) {
#line 77 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] >> $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 19) {
#line 79 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] + $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 20) {
#line 81 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] - $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 21) {
#line 83 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] * $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 22) {
#line 85 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] / $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 23) {
#line 87 "calc.y"
{ $yyval = $yyvs[$yyvsp-2] ** $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 24) {
#line 89 "calc.y"
{ $yyval = &fact($yyvs[$yyvsp-1]);
last switch;
} }
if ($yyn == 25) {
#line 91 "calc.y"
{ $yyval = -$yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 26) {
#line 93 "calc.y"
{ $yyval = !$yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 27) {
#line 95 "calc.y"
{ $yyval = $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 28) {
#line 97 "calc.y"
{ $yyval = eval($yyvs[$yyvsp-0]);
last switch;
} }
if ($yyn == 29) {
#line 99 "calc.y"
{ eval '$V{'.$yyvs[$yyvsp-2].'}=('.$yyvs[$yyvsp-0].'); 1' || &yyerror($@); $yyval = $V{$yyvs[$yyvsp-2]};
last switch;
} }
if ($yyn == 30) {
#line 101 "calc.y"
{ if (! defined $V{$yyvs[$yyvsp-0]}) {
&yyerror($yyvs[$yyvsp-0].": undefined variable");
$V{$yyvs[$yyvsp-0]} = 0;
}
$yyval = $V{$yyvs[$yyvsp-0]};
last switch;
} }
if ($yyn == 31) {
#line 108 "calc.y"
{ $yyval = $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 32) {
#line 110 "calc.y"
{ $yyval = $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 33) {
#line 112 "calc.y"
{ $yyval = $yyvs[$yyvsp-0];
last switch;
} }
if ($yyn == 34) {
#line 114 "calc.y"
{ $yyval = $P;
last switch;
} }
#line 533 "calc.tab.pl"
} # switch
$yyssp -= $yym;
$yystate = $yyss[$yyssp];
$yyvsp -= $yym;
$yym = $yylhs[$yyn];
if ($yystate == 0 && $yym == 0)
{
#if YYDEBUG
print "yydebug: after reduction, shifting from state 0 ",
"to state $YYFINAL\n" if $yydebug;
#endif
$yystate = $YYFINAL;
$yyss[++$yyssp] = $YYFINAL;
$yyvs[++$yyvsp] = $yyval;
if ($yychar < 0)
{
if (($yychar = &yylex) < 0) { $yychar = 0; }
#if YYDEBUG
if ($yydebug)
{
$yys = '';
if ($yychar <= $#yyname) { $yys = $yyname[$yychar]; }
if (!$yys) { $yys = 'illegal-symbol'; }
print "yydebug: state $YYFINAL, reading $yychar ($yys)\n";
}
#endif
}
return(0) if $yychar == 0;
next yyloop;
}
if (($yyn = $yygindex[$yym]) && ($yyn += $yystate) >= 0 &&
$yyn <= $#yycheck && $yycheck[$yyn] == $yystate)
{
$yystate = $yytable[$yyn];
} else {
$yystate = $yydgoto[$yym];
}
#if YYDEBUG
print "yydebug: after reduction, shifting from state ",
"$yyss[$yyssp] to state $yystate\n" if $yydebug;
#endif
$yyss[++$yyssp] = $yystate;
$yyvs[++$yyvsp] = $yyval;
} # yyloop
} # yyparse
#line 118 "calc.y"
# Prompt the user on STDERR, but only prompt if STDERR and the input
# file are both terminals.
# read from STDIN if no files are named on the command line
unshift(@ARGV, '-') if $#ARGV < $[;
# After finishing a file, open the next one. Return whether there
# really is a next one that was opened.
sub next_file
{
while ($ARGV = shift(@ARGV)) {
if (! open(ARGV, $ARGV)) {
print STDERR "$ARGV: cannot open file: $!\n";
next;
}
$prompt = (-t ARGV && -t STDERR) ? '(Calc) ' : '';
last;
}
$ARGV >= $[;
}
# print he prompt
sub prompt
{
print STDERR $prompt if $prompt;
}
# print an error message
sub yyerror
{
print STDERR "\"$ARGV\", " if $ARGV ne '-';
print STDERR "line $.: ", @_, "\n";
}
# Hand-coded lex until I write lex -p, too!
sub yylex
{
lexloop:
{
# get a line of input, if we need it.
if ($line eq '') {
&prompt;
$line = <ARGV>;
if ($line eq '') {
close(ARGV);
&next_file || return(0);
}
}
# Skip over white space, and grab the first character.
# If there is no such character, then grab the next line.
$line =~ s/^[ \t\f\r\v]*(.|\n)// || next lexloop;
local($char) = $1;
if ($char eq '#') {
# comment, so discard the line
$line = "\n";
&yylex;
} elsif ($char =~ /^['"]/) {
# collect the string
if ($line =~ s/^([^$char]*)$char//) {
$yylval = $1;
} else {
&yyerror('unterminated string');
$yylval = '';
}
$STRING;
} elsif ($char =~ /^\d/) {
# number, is it integer or float?
if ($line =~ s/^(\d+)//) {
$yylval = int($char . $1);
} else {
$yylval = int($char);
}
$type = $INT;
if ($line =~ s/^(\.\d*)//) {
$tmp = "0$1";
$yylval += $tmp;
$type = $FLOAT;
}
if ($line =~ s/^[eE]([-+]*\d+)//) {
$yylval *= 10 ** $1;
$type = $FLOAT;
}
$type;
} elsif ($char =~ /^\w/) {
# identifier
$line =~ s/^([\w\d]*)//;
$yylval = $char.$1;
$IDENT;
} elsif ($char eq '*' && $line =~ s/^\*//) {
$EXP;
} elsif ($char eq '!' && $line =~ s/^=//) {
$NE;
} elsif ($char eq '=' && $line =~ s/^=//) {
$EQ;
} elsif ($char =~ /^[<>]/ && $line =~ s/^=//) {
$char eq '<' ? $LE : $GE;
} elsif ($char =~ /^[<>]/ && $line =~ s/^$char//) {
$char eq '<' ? $L_SHIFT : $R_SHIFT;
} else {
$yylval = $char;
ord($char);
}
}
}
# factorial
sub fact
{
local($n) = @_;
local($f) = 1;
$f *= $n-- while ($n > 1) ;
$f;
}
# catch signals
sub catch
{
local($signum) = @_;
print STDERR "\n" if (-t STDERR && -t STDIN);
&yyerror("Floating point exception") if $signum = 8;
next outer;
}
$SIG{'INT'} = 'catch';
$SIG{'FPE'} = 'catch';
select(STDERR); $| = 1;
select(STDOUT);
&next_file;
# main program
outer: while(1)
{
$line = '';
eval '$status = &yyparse;';
exit $status if ! $@;
&yyerror($@);
}
#line 719 "calc.tab.pl"
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