class lolcode::Grammar::Actions;

method TOP($/) { my $block := $( $<block> ); $block.symbol('IT', :scope('lexical')); my $it := PAST::Var.new( :name( 'IT' ), :scope('lexical'), :viviself('Undef'), :isdecl(1)); $block.unshift($it); make $block; }

method statement ($/, $key) { if (($key eq 'expression')&&($<expression><tokens>[0]<identifier> ne 'VISIBLE')) { my $it := PAST::Var.new( :name( 'IT' ), :scope('lexical'), :viviself('Undef')); my $past := PAST::Op.new( :pasttype('bind'), :node( $/ ) ); $past.push( $it ); $past.push( $( $<expression> ) ); make $past; } else { make $( $/{$key} ); # For now } }

method declare($/) { our $?BLOCK; our @?BLOCK;

    my $name := ~$<variable><identifier>;

    my $var := PAST::Var.new( :name( $name ),
                        :viviself('Undef'),
                        :node( $/ )
                    );

    my $scope := 'lexical';
    if $<scope>[0] {
        if ~$<scope>[0] eq 'FARAWAY' {
            $scope := 'package';
        }
    }

    $var.scope(~$scope);
    unless $?BLOCK.symbol($name) {
        $?BLOCK.symbol($name, :scope($scope));
        $var.isdecl(1);
    }

    if ($<expression>) {
        $var.isdecl(1);
        # XXX Someone clever needs to refactor this into C<assign>
        my $past := PAST::Op.new( :pasttype('bind'), :node( $/ ) );
        $past.push( $var );
        $past.push( $( $<expression>[0] ) );
        make $past;
    }
    else {
        make $var;
    }
}

method assign($/) { my $past := PAST::Op.new( :pasttype('bind'), :node( $/ ) ); $past.push( $( $<variable> ) ); $past.push( $( $<expression> ) ); make $past; }

method function($/,$key) { our $?BLOCK; if $key eq 'params' { our $?BLOCK_SIGNATURE; my $arglist; $arglist := PAST::Stmts.new(); # if there are any parameters, get the PAST for each of them and # adjust the scope to parameter. for $<parameters> { my $param := PAST::Var.new(:name(~$_<identifier>), :scope('parameter'), :node($($_))); $param.isdecl(1); $arglist.push($param); } $?BLOCK_SIGNATURE := $arglist; } elsif $key eq 'block' { my $block := $( $<block> ); $block.blocktype('declaration'); $?BLOCK.symbol(~$<variable><identifier>, :arity($block.arity()));

        my $it := PAST::Var.new( :name( 'IT' ), :scope('lexical'), :viviself('Undef'), :isdecl(1));
        $block[1].unshift($it);

        $it := PAST::Var.new( :name( 'IT' ), :scope('lexical'));
        $block[1].push($it);
        $block.name(~$<variable><identifier>);
        make $block;
        #my $past := PAST::Op.new( :pasttype('bind'), :node( $/ ) );
        #$($<variable>).isdecl(1);
        #$past.push( $( $<variable> ) );
        #$past.push( $block );
        #make $past;
    }

}

method ifthen($/) { my $count := +$<expression> - 1; my $expr := $( $<expression>[$count] ); my $then := $( $<block>[$count] ); $then.blocktype('immediate'); my $past := PAST::Op.new( $expr, $then, :pasttype('if'), :node( $/ ) ); if ( $<else> ) { my $else := $( $<else>[0] ); $else.blocktype('immediate'); $past.push( $else ); } while ($count != 0) { $count := $count - 1; $expr := $( $<expression>[$count] ); $then := $( $<block>[$count] ); $then.blocktype('immediate'); $past := PAST::Op.new( $expr, $then, $past, :pasttype('if'), :node( $/ ) ); } $expr := $past.shift(); my $it := PAST::Var.new( :name( 'IT' ), :scope('lexical'), :viviself('Undef')); my $bind := PAST::Op.new( :pasttype('bind'), :node( $/ ) ); $bind.push( $it ); $bind.push( $expr ); $past.unshift( $it ); my $past := PAST::Stmts.new( $bind, $past, :node( $/ ) ); make $past; }

method switch($/) { my $count := +$<value> - 1; my $val := $( $<value>[$count] ); my $then := $( $<block>[$count] ); my $it := PAST::Var.new( :name( 'IT' ), :scope('lexical'), :viviself('Undef')); my $expr := PAST::Op.new(:pasttype('call'), :name('BOTH SAEM'), $it, $val); $then.blocktype('immediate'); my $past := PAST::Op.new( $expr, $then, :pasttype('if'), :node( $/ ) ); if ( $<else> ) { my $else := $( $<else>[0] ); $else.blocktype('immediate'); $past.push( $else ); } while ($count != 0) { $count := $count - 1; $val := $( $<value>[$count] ); $expr := PAST::Op.new(:pasttype('call'), :name('BOTH SAEM'), $it, $val); $then := $( $<block>[$count] ); $then.blocktype('immediate'); $past := PAST::Op.new( $expr, $then, $past, :pasttype('if'), :node( $/ ) ); } #$expr := $past.shift(); #my $it := PAST::Var.new( :name( 'IT' ), :scope('lexical'), :viviself('Undef')); #my $bind := PAST::Op.new( :pasttype('bind'), :node( $/ ) ); #$bind.push( $it ); #$bind.push( $expr ); #$past.unshift( $it ); my $past := PAST::Stmts.new( $past, :node( $/ ) ); make $past; }

method block($/,$key) { our $?BLOCK; our @?BLOCK; if $key eq 'open' { our $?BLOCK_SIGNATURE; $?BLOCK := PAST::Block.new( PAST::Stmts.new(), :node($/), :lexical(1) ); @?BLOCK.unshift($?BLOCK); my $iter := $?BLOCK_SIGNATURE.iterator(); $?BLOCK.arity(0); for $iter { $?BLOCK.arity($?BLOCK.arity() + 1); $?BLOCK[0].push($_); $?BLOCK.symbol($_.name(), :scope('lexical')); } } elsif $key eq 'close' { #my $past := PAST::Block.new( :blocktype('declaration'), :node( $/ ) ); my $past := @?BLOCK.shift(); $?BLOCK := @?BLOCK[0]; my $stmts := PAST::Stmts.new( :node( $/ ) ); for $<statement> { $stmts.push( $( $_ ) ); } $past.push($stmts); make $past; } }

method value($/, $key) { make $( $/{$key} ); }

method bang($/) { make PAST::Val.new( :value( ~$/ ), :returns('String'), :node($/) ); }

sub find_in_blocks($name) { our $?BLOCK; our @?BLOCK; if $?BLOCK.symbol(~$name) { return $?BLOCK.symbol($name); } for @?BLOCK { if $_.symbol(~$name) { return $_.symbol($name); } } return 0; }

sub is_sub($name) { my $sym := find_in_blocks($name); if $sym && defined($sym<arity>) { return 1; } my $lex := lookup($name); if lookup_class($lex) eq 'Sub' { return 1; } return 0; }

sub get_item($name) { if is_sub($name) { return PAST::Op.new( :name($name), :pasttype('call') ); } else { my $var := PAST::Var.new(:name($name)); my $sym := find_in_blocks($name); if $sym && defined($sym<scope>) { $var<scope> := $sym<scope> } return $var; } }

sub get_arity($name) { my $sym := find_in_blocks($name); if $sym { return $sym<arity>; } else { my $lex := lookup($name); my $ii := get_inspect_info($lex); if $ii<pos_slurpy> { return -1; } else { return $lex.arity(); } } }

method expression($/) { my @subs; my @vals; my @arity; my $mkay := 'mkay';

    for $<tokens> {
        if($_<identifier>) {
            my $name := ~$_<identifier>;
            my $item := get_item($name);
            if is_sub($name) {
                my $arity := get_arity($name);
                $item<arity> := $arity;
                @subs.push($item);
                @arity.unshift($arity + 0);
                if @arity[0] == -1 { @vals.push($mkay) }
            }
            else {
                @vals.push($item);
                if defined(@arity[0]) {@arity[0]--};
            }
        }
        else {
            my $item := $( $_ );
            @vals.push($item);
            if defined(@arity[0]) {@arity[0]--};
        }

        while defined(@arity[0]) && @arity[0] == 0 {
            my $sub := @subs.pop();
            @arity.shift();
            my $arity := $sub<arity> + 0;
            while $arity > 0 {
                $sub.unshift(@vals.pop());
                $arity--;
            }
            @vals.push($sub);
            if defined(@arity[0]) {@arity[0]--};
        }
    }

    if @vals[0] eq $mkay {
        @vals.shift();
        my $sub := @subs.pop();
        while +@vals {
            $sub.unshift(@vals.pop());
        }
        @vals.push($sub);
    }
    make @vals[0];
}

method integer($/) { make PAST::Val.new( :value( ~$/ ), :returns('Integer'), :node($/) ); }

method float($/) { make PAST::Val.new( :value( ~$/ ), :returns('Float'), :node($/) ); }

method boolean($/) { if (~$/ eq 'FAIL' ) { make PAST::Val.new( :value( 0 ), :returns('Boolean'), :node($/) ); } else { make PAST::Val.new( :value( 1 ), :returns('Boolean'), :node($/) ); } }

method quote($/) { make PAST::Val.new( :value( $($<yarn_literal>) ), :node($/) ); }

method variable ($/) { if ($<identifier> eq 'IT') { make PAST::Var.new( :name( 'IT' ), :scope('lexical'), :viviself('Undef')); } else { our $?BLOCK; our @?BLOCK;

        my $var := PAST::Var.new( :name( $<identifier> ),
                            :scope('lexical'),
                            :viviself('Undef'),
                            :node( $/ )
                        );
        if $?BLOCK.symbol($<identifier>) {
            my $scope := '' ~ $?BLOCK.symbol($<identifier>)<scope>;
            $var.scope(~$scope);
        }
        else {
            our @?BLOCK;
            my $exists := 0;
            my $scope;
            for @?BLOCK {
                if $_ {
                    my $sym_table := $_.symbol(~$<identifier>);
                    if $sym_table {
                        $exists := 1;
                        $scope := '' ~ $sym_table<scope>;
                    }
                }
            }
            if $exists == 0 {
                $var.scope('package');
            }
            else {
                $var.scope($scope);
            }
        }

        make $var;
    }
}

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