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# expr.yp
# Copyright (C) 2006 Jelmer Vernooij <jelmer@samba.org>
# Published under the GNU GPL
#
%left '->'
%right '!' '~'
%left '*' '/' '%'
%left '+' '-'
%left '<<' '>>'
%left '>' '<'
%left '==' '!='
%left '&'
%left '|'
%left '&&'
%left '||'
%left '?' ':'
%left NEG DEREF ADDROF INV
%left '.'
%%
exp: NUM
| TEXT { "\"$_[1]\"" }
| func
| var
| '~' exp %prec INV { "~$_[2]" }
| exp '+' exp { "$_[1] + $_[3]" }
| exp '-' exp { "$_[1] - $_[3]" }
| exp '*' exp { "$_[1] * $_[3]" }
| exp '%' exp { "$_[1] % $_[3]" }
| exp '<' exp { "$_[1] < $_[3]" }
| exp '>' exp { "$_[1] > $_[3]" }
| exp '|' exp { "$_[1] | $_[3]" }
| exp '==' exp { "$_[1] == $_[3]" }
| exp '<=' exp { "$_[1] <= $_[3]" }
| exp '=>' exp { "$_[1] => $_[3]" }
| exp '<<' exp { "$_[1] << $_[3]" }
| exp '>>' exp { "$_[1] >> $_[3]" }
| exp '!=' exp { "$_[1] != $_[3]" }
| exp '||' exp { "$_[1] || $_[3]" }
| exp '&&' exp { "$_[1] && $_[3]" }
| exp '&' exp { "$_[1] & $_[3]" }
| exp '?' exp ':' exp { "$_[1]?$_[3]:$_[5]" }
| '~' exp { "~$_[1]" }
| '!' exp { "not $_[1]" }
| exp '/' exp { "$_[1] / $_[3]" }
| '-' exp %prec NEG { "-$_[2]" }
| '&' exp %prec ADDROF { "&$_[2]" }
| exp '^' exp { "$_[1]^$_[3]" }
| '(' exp ')' { "($_[2])" }
;
possible_pointer:
VAR { $_[0]->_Lookup($_[1]) }
| '*' possible_pointer %prec DEREF { $_[0]->_Dereference($_[2]); "*$_[2]" }
;
var: possible_pointer { $_[0]->_Use($_[1]) }
| var '.' VAR { $_[0]->_Use("$_[1].$_[3]") }
| '(' var ')' { "($_[2])" }
| var '->' VAR { $_[0]->_Use("*$_[1]"); $_[1]."->".$_[3] }
;
func: VAR '(' opt_args ')' { "$_[1]($_[3])" };
opt_args: { "" } | args;
exp_or_possible_pointer: exp | possible_pointer;
args: exp_or_possible_pointer
| exp_or_possible_pointer ',' args { "$_[1], $_[3]" }
;
%%
package Parse::Pidl::Expr;
sub _Lexer {
my($parser)=shift;
$parser->YYData->{INPUT}=~s/^[ \t]//;
for ($parser->YYData->{INPUT}) {
if (s/^(0x[0-9A-Fa-f]+)//) {
$parser->YYData->{LAST_TOKEN} = $1;
return('NUM',$1);
}
if (s/^([0-9]+(?:\.[0-9]+)?)//) {
$parser->YYData->{LAST_TOKEN} = $1;
return('NUM',$1);
}
if (s/^([A-Za-z_][A-Za-z0-9_]*)//) {
$parser->YYData->{LAST_TOKEN} = $1;
return('VAR',$1);
}
if (s/^\"(.*?)\"//) {
$parser->YYData->{LAST_TOKEN} = $1;
return('TEXT',$1);
}
if (s/^(==|!=|<=|>=|->|\|\||<<|>>|&&)//s) {
$parser->YYData->{LAST_TOKEN} = $1;
return($1,$1);
}
if (s/^(.)//s) {
$parser->YYData->{LAST_TOKEN} = $1;
return($1,$1);
}
}
}
sub _Use($$)
{
my ($self, $x) = @_;
if (defined($self->YYData->{USE})) {
return $self->YYData->{USE}->($x);
}
return $x;
}
sub _Lookup($$)
{
my ($self, $x) = @_;
return $self->YYData->{LOOKUP}->($x);
}
sub _Dereference($$)
{
my ($self, $x) = @_;
if (defined($self->YYData->{DEREFERENCE})) {
$self->YYData->{DEREFERENCE}->($x);
}
}
sub _Error($)
{
my ($self) = @_;
if (defined($self->YYData->{LAST_TOKEN})) {
$self->YYData->{ERROR}->("Parse error in `".$self->YYData->{FULL_INPUT}."' near `". $self->YYData->{LAST_TOKEN} . "'");
} else {
$self->YYData->{ERROR}->("Parse error in `".$self->YYData->{FULL_INPUT}."'");
}
}
sub Run {
my($self, $data, $error, $lookup, $deref, $use) = @_;
$self->YYData->{FULL_INPUT} = $data;
$self->YYData->{INPUT} = $data;
$self->YYData->{LOOKUP} = $lookup;
$self->YYData->{DEREFERENCE} = $deref;
$self->YYData->{ERROR} = $error;
$self->YYData->{USE} = $use;
return $self->YYParse( yylex => \&_Lexer, yyerror => \&_Error);
}
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