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package SQL::Abstract::Formatter; require SQL::Abstract::Parts; # it loads us too, don't cross the streams use Moo; has indent_by => (is => 'ro', default => ' '); has max_width => (is => 'ro', default => 78); sub _join { shift; return SQL::Abstract::Parts::stringify(\@_); } sub format { my ($self, $join, @parts) = @_; $self->_fold_sql('', '', @{$self->_simplify($join, @parts)}); } sub _simplify { my ($self, $join, @parts) = @_; return '' unless @parts; return $parts[0] if @parts == 1 and !ref($parts[0]); return $self->_simplify(@{$parts[0]}) if @parts == 1; return [ $join, map ref() ? $self->_simplify(@$_) : $_, @parts ]; } sub _fold_sql { my ($self, $indent0, $indent, $join, @parts) = @_; my @res; my $w = $self->max_width; my $join_len = 0; (s/, \z/,\n/ and $join_len = 1) or s/\a /\n/ or $_ = "\n" for my $line_join = $join; my ($nl_pre, $nl_post) = split "\n", $line_join; my $line_orig = my $line = $indent0; my $next_indent = $indent.$self->indent_by; my $line_proto = $indent.$nl_post; PART: foreach my $idx (0..$#parts) { my $p = $parts[$idx]; #::DwarnT STARTPART => $p, \@res, $line, $line_orig; my $pre = ($line ne $line_orig ? $join : ''); my $j_part = $pre.(my $j = ref($p) ? $self->_join(@$p) : $p); if (length($j_part) + length($line) + $join_len <= $w) { $line .= $j_part; next PART; } my $innerdent = @res ? $next_indent : $indent0.$self->indent_by; if (ref($p) and $p->[1] eq '(' and $p->[-1] eq ')') { my $already = !($line eq $indent0 or $line eq $line_orig); push @res, $line.($already ? $join : '').'('."\n"; my (undef, undef, $inner) = @$p; my $folded = $self->_fold_sql($innerdent, $innerdent, @$inner); $folded =~ s/\n\z//; push @res, $folded."\n"; $line_orig = $line = $indent0.')'.($idx == $#parts ? '' : $join); next PART; } if ($line ne $line_orig) { push @res, $line.($idx == $#parts ? '' : $nl_pre)."\n"; } if (length($line = $line_proto.$j) <= $w) { next PART; } my $folded = $self->_fold_sql($line_proto, $innerdent, @$p); $folded =~ s/\n\z//; push @res, $folded.($idx == $#parts ? '' : $nl_pre)."\n"; $line_orig = $line = $idx == $#parts ? '' : $line_proto; } continue { #::DwarnT ENDPART => $parts[$idx], \@res, $line, $line_orig; } return join '', @res, $line; } 1;