#!/usr/bin/perl -w
use strict;
#use Test::More qw(no_plan);
use Test::More tests => 5;
#use Test::Exception;
our $test_exception_installed;
BEGIN {
$test_exception_installed = 1;
eval { require Test::Exception };
$test_exception_installed = 0 if $@;
}
use_ok qw(Parse::Eyapp) or exit;
use Data::Dumper;
use_ok qw( Parse::Eyapp::Treeregexp) or exit;
my $translationscheme = q{
%{
# head code is available at tree construction time
use Data::Dumper;
our %sym; # symbol table
our %Op = ( PLUS => '+', MINUS => '-', 'TIMES' => '*', DIV => '/');
%}
%defaultaction { $lhs->{n} = eval " $left->{n} $Op{$lhs->type} $right->{n} " }
%metatree
%left '='
%left '-' '+'
%left '*' '/'
%%
line: %name EXP
exp <+ ';'> /* Expressions separated by semicolons */
{ $lhs->{n} = $_[1]->Last_child->{n} }
;
exp:
%name PLUS
exp.left '+' exp.right
| %name MINUS
exp.left '-' exp.right
| %name TIMES
exp.left '*' exp.right
| %name DIV
exp.left '/' exp.right
| %name NUM $NUM
{ $lhs->{n} = $NUM->{attr} }
| '(' $exp ')' %begin { $exp }
| %name VAR
$VAR
{ $lhs->{n} = $sym{$VAR->{attr}}->{n} }
| %name ASSIGN
$VAR '=' $exp
{ $lhs->{n} = $sym{$VAR->{attr}}->{n} = $exp->{n} }
;
%%
# tail code is available at tree construction time
sub _Error {
die "Syntax error.\n";
}
sub _Lexer {
my($parser)=shift;
for ($parser->YYData->{INPUT}) {
defined($_) or return('',undef);
s/^\s*//;
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
$Data::Dumper::Indent = 1;
$Data::Dumper::Terse = 1;
$Data::Dumper::Deepcopy = 1;
SKIP: {
skip "Test::Exception not installed", 1 unless $test_exception_installed;
Test::Exception::lives_ok { Parse::Eyapp->new_grammar(
input=>$translationscheme,
classname=>'main',
firstline => 6,
#outputfile => 'main.pm'
) } 'No errors in input translation scheme';
}
unless ($test_exception_installed) {
Parse::Eyapp->new_grammar(
input=>$translationscheme,
classname=>'main',
firstline => 6,
#outputfile => 'main.pm'
)
}
my $parser = main->new();
#print "Write a sequence of arithmetic expressions: " if is_interactive();
$parser->YYData->{INPUT} = 'a=2*3; b= 1+a; a*b'; # <>;
my $t = $parser->Run() or die "Syntax Error analyzing input";
$t->translation_scheme;
my $treestring = Dumper($t);
our %sym;
my $symboltable = Dumper(\%sym);
my $expectedsym = { 'a' => { 'n' => 6 }, 'b' => { 'n' => 7 } };
is_deeply(\%sym, $expectedsym, "symbol tables");
my $expected_result = 42;
is($t->{n}, $expected_result, "a=2*3; b= 1+a; a*b == 42");
# print <<"EOR";
# ***********Tree*************
# $treestring
# ******Symbol table**********
# $symboltable
# ************Result**********
# $t->{n}
#
# EOR