#!/usr/bin/perl -w
# Test clean_tree
use strict;
use Test::More tests => 3;
use_ok qw( Parse::Eyapp );
use_ok qw( Parse::Eyapp::Treeregexp );
#use Data::Dumper;
my $translationscheme = q{
%{
# head code is available at tree construction time
#use Data::Dumper;
%}
%defaultaction { $lhs->{n} = $_[1]->{n} }
%metatree
%left '-' '+'
%left '*'
%left NEG
%%
line: %name EXP
exp
;
exp:
%name PLUS
exp.left '+' exp.right
{ $lhs->{n} .= $left->{n} + $right->{n} }
| %name TIMES
exp.left '*' exp.right
{ $lhs->{n} = $left->{n} * $right->{n} }
| %name NUM $NUM
{ $lhs->{n} = $NUM->{attr} }
| '(' $exp ')' %begin { $exp }
| %name MINUS
exp.left '-' exp.right
{ $lhs->{n} = $left->{n} - $right->{n} }
| %name UMINUS
'-' $exp %prec NEG
{ $lhs->{n} = -$exp->{n} }
;
%%
# tail code is available at tree construction time
sub _Error { die "Syntax error.\n"; }
sub _Lexer {
my($parser)=shift;
$parser->YYData->{INPUT} or return('',undef);
$parser->YYData->{INPUT}=~s/^\s*//;
for ($parser->YYData->{INPUT}) {
s/^([0-9]+(?:\.[0-9]+)?)// and return('NUM',$1);
s/^([A-Za-z][A-Za-z0-9_]*)// and return('VAR',$1);
s/^(.)// and return($1,$1);
s/^\s*//;
}
}
sub Run {
my($self)=shift;
return $self->YYParse( yylex => \&_Lexer, yyerror => \&_Error );
}
}; # end translation scheme
sub is_syntactic_terminal {
my $self = shift;
return (ref($self) eq 'TERMINAL') and exists($self->{token}) and exists($self->{attr})
and ($self->{token} eq $self->{attr});
}
Parse::Eyapp->new_grammar(
input=>$translationscheme,
classname=>'Calc',
firstline =>7,
# outputfile => 'Calc.pm'
);
my $parser = Calc->new(); # Create the parser
$parser->YYData->{INPUT} = "2*(3-3)\n"; # Set the input
my $t = $parser->Run; # Parse it
#$Data::Dumper::Indent = 1;
#$Data::Dumper::Terse = 1;
#$Data::Dumper::Deepcopy = 1;
#print Dumper($t); # Show the tree
# Get the AST
$t->clean_tree(sub { (ref($_[0]) eq 'CODE') or is_syntactic_terminal($_[0]) });
#print Dumper($t); # Show the tree
my $expected_tree = bless( {
'children' => [
bless( {
'children' => [
bless( { 'children' => [] }, 'NUM' ),
bless( { 'children' => [
bless( { 'children' => [] }, 'NUM' ),
bless( { 'children' => [] }, 'NUM' )
]
}, 'MINUS' )
]
}, 'TIMES' )
]
}, 'EXP' );
is_deeply($t, $expected_tree, "clean_tree");