whatpm/Whatpm/HTMLTable.pm

package Whatpm::HTMLTable;
use strict;

## An implementation of "Forming a table" algorithm in HTML5
sub form_table ($$$;$) {
  my (undef, $table_el, $onerror, $must_level) = @_;
  $onerror ||= sub { };
  $must_level ||= 'm';
  
  ## Step 1
  my $x_width = 0;

  ## Step 2
  my $y_height = 0;
  my $y_max_node;

  ## Step 3
  my $pending_tfoot = [];
  
  ## Step 4
  my $table = {
    #caption
    column => [],
    column_group => [],
    row => [], ## NOTE: HTML5 algorithm doesn't associate rows with <tr>s.
    row_group => [],
    cell => [],
    height => 0,
    width => 0,
  };
  
  my @column_has_anchored_cell;
  my @row_has_anchored_cell;
  my @column_generated_by;
  my @row_generated_by;
  
  ## Step 5
  my @table_child = @{$table_el->child_nodes};
  return $table unless @table_child;

  ## Step 6
  for (0..$#table_child) {
    my $el = $table_child[$_];
    next unless $el->node_type == 1; # ELEMENT_NODE
    next unless $el->manakai_local_name eq 'caption';
    my $nsuri = $el->namespace_uri;
    next unless defined $nsuri;
    next unless $nsuri eq q<http://www.w3.org/1999/xhtml>;
    $table->{caption} = {element => $el};
    splice @table_child, $_, 1, ();
    last;
  }

  my $process_row_group;
  my $end = sub {
    ## Step 19 (End)
    for (@$pending_tfoot) {
      $process_row_group->($_);
    }
    
    ## Step 20
    for (0 .. $x_width - 1) {
      unless ($column_has_anchored_cell[$_]) {
        if ($table->{column}->[$_]) {
          $onerror->(type => 'column with no anchored cell',
                     node => $table->{column}->[$_]->{element},
                     level => $must_level);
        } else {
          $onerror->(type => 'colspan creates column with no anchored cell',
                     node => $column_generated_by[$_],
                    level => $must_level);
        }
        last; # only one error.
      }
    }
    for (0 .. $y_height - 1) {
      unless ($row_has_anchored_cell[$_]) {
        if ($table->{row}->[$_]) {
          $onerror->(type => 'row with no anchored cell',
                     node => $table->{row}->[$_]->{element},
                     level => $must_level);
        } else {
          $onerror->(type => 'rowspan creates row with no anchored cell',
                     node => $row_generated_by[$_],
                     level => $must_level);
        }
        last; # only one error.
      }
    }
    
    ## Step 21
    #return $table;
  }; # $end

  ## Step 7, 8
  my $current_element;
  my $current_ln;
  NEXT_CHILD: {
    $current_element = shift @table_child;
    if (defined $current_element) {
      redo NEXT_CHILD unless $current_element->node_type == 1;
      my $nsuri = $current_element->namespace_uri;
      redo NEXT_CHILD unless defined $nsuri and
        $nsuri eq q<http://www.w3.org/1999/xhtml>;
      $current_ln = $current_element->manakai_local_name;

      redo NEXT_CHILD unless {
        colgroup => 1,
        thead => 1,
        tbody => 1,
        tfoot => 1,
        tr => 1,
      }->{$current_ln};
    } else {
      ## Step 6 2nd paragraph
      $end->();
      $table->{width} = $x_width;
      $table->{height} = $y_height;
      return $table;
    }
  } # NEXT_CHILD

  ## Step 9
  while ($current_ln eq 'colgroup') { # Step 9, Step 9.4
    ## Step 9.1: column groups
    my @col = grep {
      $_->node_type == 1 and
      defined $_->namespace_uri and
      $_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
      $_->manakai_local_name eq 'col'
    } @{$current_element->child_nodes};
    if (@col) {
      ## Step 1
      my $x_start = $x_width;
      
      ## Step 2, 6
      while (@col) {
        my $current_column = shift @col;
        
        ## Step 3: columns
        my $span = 1;
        my $col_span = $current_column->get_attribute_ns (undef, 'span');
        ## Parse non-negative integer
        if (defined $col_span and $col_span =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
          $span = $1 || 1;
        }
        ## ISSUE: If span=0, what is /span/ value?
        
        ## Step 4, 5
        $table->{column}->[$x_width++] = {element => $current_column}
            for 1..$span;
      }
      
      ## Step 7
      my $cg = {element => $current_element,
                x => $x_start, y => 0,
                width => $x_width - $x_start};
      $table->{column_group}->[$_] = $cg for $x_start .. $x_width - 1;
    } else { # no <col> children
      ## Step 1
      my $span = 1;
      my $col_span = $current_element->get_attribute_ns (undef, 'span');
      ## Parse non-negative integer
      if (defined $col_span and $col_span =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
        $span = $1 || 1;
      }
      ## ISSUE: If span=0, what is /span/ value?
      
      ## Step 2
      $x_width += $span;
      
      ## Step 3
      my $cg = {element => $current_element,
                x => $x_width - $span, y => 0,
                width => $span};
      $table->{column_group}->[$_] = $cg for $cg->{x} .. $x_width - 1;
    }
    
    ## Step 9.2, 9.3
    NEXT_CHILD: {
      $current_element = shift @table_child;
      if (defined $current_element) {
        redo NEXT_CHILD unless $current_element->node_type == 1;
        my $nsuri = $current_element->namespace_uri;
        redo NEXT_CHILD unless defined $nsuri and
          $nsuri eq q<http://www.w3.org/1999/xhtml>;
        $current_ln = $current_element->manakai_local_name;
        
        redo NEXT_CHILD unless {
          colgroup => 1,
          thead => 1,
          tbody => 1,
          tfoot => 1,
          tr => 1,
        }->{$current_ln};
      } else {
        ## End of subsection
        
        ## Step 5 of overall steps 2nd paragraph
        $end->();
        $table->{width} = $x_width;
        $table->{height} = $y_height;
        return $table;
      }
    } # NEXT_CHILD
  }

  ## Step 10
  my $y_current = 0;

  ## Step 11
  my @downward_growing_cells;

  my $growing_downward_growing_cells = sub {
    for (@downward_growing_cells) {
      for my $x ($_->[1] .. ($_->[1] + $_->[2] - 1)) {
        $table->{cell}->[$x]->[$y_current] = [$_->[0]];
        $_->[0]->{height}++;
      }
    }
  }; # $growing_downward_growing_cells

  my $process_row = sub {
    ## Step 1
    $y_height++ if $y_height == $y_current;
    
    ## Step 2
    my $x_current = 0;

    ## Step 3
    my $tr = shift;
    $table->{row}->[$y_current] = {element => $tr};
    my @tdth = grep {
      $_->node_type == 1 and
      defined $_->namespace_uri and
      $_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
      {td => 1, th => 1}->{$_->manakai_local_name}
    } @{$tr->child_nodes};
    my $current_cell = shift @tdth;

    ## Step 4
    $growing_downward_growing_cells->();

return unless $current_cell;
## ISSUE: Support for empty <tr></tr> (removed at revision 1376).

    CELL: while (1) {
      ## Step 5: cells
      $x_current++
        while ($x_current < $x_width and
               $table->{cell}->[$x_current]->[$y_current]);

      ## Step 6
      $x_width++ if $x_current == $x_width;

      ## Step 7
      my $colspan = 1;
      my $attr_value = $current_cell->get_attribute_ns (undef, 'colspan');
      if (defined $attr_value and $attr_value =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
        $colspan = $1 || 1;
      }
      
      ## Step 8
      my $rowspan = 1;
      my $attr_value = $current_cell->get_attribute_ns (undef, 'rowspan');
      if (defined $attr_value and $attr_value =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
        $rowspan = $1;
      }
      
      ## Step 9
      my $cell_grows_downward;
      if ($rowspan == 0) {
        $cell_grows_downward = 1;
        $rowspan = 1;
      }
      
      ## Step 10
      if ($x_width < $x_current + $colspan) { 
        @column_generated_by[$_] = $current_cell
          for $x_width .. $x_current + $colspan - 1;
        $x_width = $x_current + $colspan;
      }
      
      ## Step 11
      if ($y_height < $y_current + $rowspan) {
        @row_generated_by[$_] = $current_cell
            for $y_height .. $y_current + $rowspan - 1;
        $y_height = $y_current + $rowspan;
        $y_max_node = $current_cell;
      }
      
      ## Step 12
      my $cell = {
                  is_header => ($current_cell->manakai_local_name eq 'th'),
                  element => $current_cell,
                  x => $x_current, y => $y_current,
                  width => $colspan, height => $rowspan,
                 };
      $column_has_anchored_cell[$x_current] = 1;
      $row_has_anchored_cell[$y_current] = 1;
      for my $x ($x_current .. ($x_current + $colspan - 1)) {
        for my $y ($y_current .. ($y_current + $rowspan - 1)) {
          unless ($table->{cell}->[$x]->[$y]) {
            $table->{cell}->[$x]->[$y] = [$cell];
          } else {
            $onerror->(type => "cell overlapping:$x:$y", node => $current_cell,
                       level => $must_level);
            push @{$table->{cell}->[$x]->[$y]}, $cell;
          }
        }
      }

      ## Whether the cell is an empty data cell or not
      if (not $cell->{is_header}) {
        $cell->{is_empty} = 1;
        for my $node (@{$current_cell->child_nodes}) {
          my $nt = $node->node_type;
          if ($nt == 3 or $nt == 4) { # TEXT_NODE / CDATA_SECTION_NODE
            if ($node->data =~ /\P{Zs}/) { ## TOOD: non-Zs class
              delete $cell->{is_empty};
              last;
            }
          } elsif ($nt == 1) { # ELEMENT_NODE
            delete $cell->{is_empty};
            last;
          }
        }
        ## NOTE: Entity references are not supported
      }
      
      ## Step 13
      if ($cell_grows_downward) {
        push @downward_growing_cells, [$cell, $x_current, $colspan];
      }
      
      ## Step 14
      $x_current += $colspan;

      ## Step 15-17
      $current_cell = shift @tdth;
      if (defined $current_cell) {
        ## Step 16-17
        #
      } else {
        ## Step 15
        $y_current++;
        last CELL;
      }
    } # CELL
  }; # $process_row

  $process_row_group = sub ($) {
    ## Step 1
    my $y_start = $y_height;

    ## Step 2
    for (grep {
      $_->node_type == 1 and
      defined $_->namespace_uri and
      $_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
      $_->manakai_local_name eq 'tr'
    } @{$_[0]->child_nodes}) {
      $process_row->($_);
    }

    ## Step 3
    if ($y_height > $y_start) {
      my $rg = {element => $current_element, ## ISSUE: "element being processed"?
                x => 0, y => $y_start,
                height => $y_height - $y_start};
      $table->{row_group}->[$_] = $rg for $y_start .. $y_height - 1;
    }

    ## Step 4
    ## Ending a row group
      ## Step 1
      while ($y_current < $y_height) {
        ## Step 1
        $growing_downward_growing_cells->();

        ## Step 2
        $y_current++;
      }
      ## Step 2
      @downward_growing_cells = ();
  }; # $process_row_group

  ## Step 12: rows
  unshift @table_child, $current_element;
  ROWS: {
    NEXT_CHILD: {
      $current_element = shift @table_child;
      if (defined $current_element) {
        redo NEXT_CHILD unless $current_element->node_type == 1;
        my $nsuri = $current_element->namespace_uri;
        redo NEXT_CHILD unless defined $nsuri and
          $nsuri eq q<http://www.w3.org/1999/xhtml>;
        $current_ln = $current_element->manakai_local_name;
      
        redo NEXT_CHILD unless {
          thead => 1,
          tbody => 1,
          tfoot => 1,
          tr => 1,
        }->{$current_ln};
      } else {
        ## Step 6 2nd paragraph
        $end->();
        $table->{width} = $x_width;
        $table->{height} = $y_height;
        return $table;
      }
    } # NEXT_CHILD

    ## Step 13
    if ($current_ln eq 'tr') {
      $process_row->($current_element);
      # advance (done at the first of ROWS)
      redo ROWS;
    }

    ## Step 14
    ## Ending a row group
      ## Step 1
      while ($y_current < $y_height) {
        ## Step 1
        $growing_downward_growing_cells->();

        ## Step 2
        $y_current++;
      }
      ## Step 2
      @downward_growing_cells = ();

    ## Step 15
    if ($current_ln eq 'tfoot') {
      push @$pending_tfoot, $current_element;
      # advance (done at the top of ROWS)
      redo ROWS;
    }

    ## Step 16
    # thead or tbody
    $process_row_group->($current_element);

    ## Step 17
    # Advance (done at the top of ROWS).

    ## Step 18
    redo ROWS;
  } # ROWS

  $end->();
  $table->{width} = $x_width;
  $table->{height} = $y_height;
  return $table;
} # form_table

sub assign_header ($$;$$) {
  my (undef, $table, $onerror, $must_level) = @_;
  $onerror ||= sub { };
  $must_level ||= 'm';

  my $assign_header = sub ($$$) {
    my $_cell = shift;
    my ($x, $y) = @_;

    for my $__cell (@{$_cell or []}) {
      if ($__cell and $__cell->{element} and
          not $__cell->{is_header} and
          not $__cell->{element}->has_attribute_ns (undef, 'headers')) {
        $__cell->{header}->{$x}->{$y} = 1;
      }
    }
  }; # $assign_header

  for my $x (0 .. $table->{width} - 1) {
    for my $y (0 .. $table->{height} - 1) {
      my $cell = $table->{cell}->[$x]->[$y];
      $cell = $cell->[0] if $cell; # anchored cell is always ->{cell}[][][0].
      next if $cell->{x} != $x;
      next if $cell->{y} != $y;
      if ($cell) {
        if ($cell->{is_header}) {
          my $scope = $cell->{element}->get_attribute_ns (undef, 'scope');
          $scope = $scope ? lc $scope : ''; ## TODO: case
          if ($scope eq 'row') {
            for my $_x ($x + $cell->{width} .. $table->{width} - 1) {
              for my $_y ($y .. $y + $cell->{height} - 1) {
                $assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
              }
            }
          } elsif ($scope eq 'col') {
            for my $_x ($x .. $x + $cell->{width} - 1) {
              for my $_y ($y .. $table->{height} - 1) {
                $assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
              }
            }
          } elsif ($scope eq 'rowgroup') {
            ## NOTE: A cell cannot exceed across a row group boundary.
            if ($table->{row_group}->[$y] and
                $table->{row_group}->[$y]->{height}) {
              for my $_x ($x .. $table->{width} - 1) {
                for my $_y ($y ..
                            $table->{row_group}->[$y]->{y} +
                            $table->{row_group}->[$y]->{height} - 1) {
                  $assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
                }
              }
            }
            ## TODO: Should we raise a warning?
          } elsif ($scope eq 'colgroup') {
            if ($table->{column_group}->[$x] and
                $table->{column_group}->{width} and
                $table->{column_group}->[$x]->{x} == $x) { # anchored
              for my $_x ($x .. 
                          $table->{column_group}->[$x]->{x} + 
                          $table->{column_group}->[$x]->{width} - 1) {
                for my $_y ($y .. $table->{height} - 1) {
                  $assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
                }
              }
            }
            ## TODO: Warning?
          } else { # auto
            ## 1.
            my $header_width = $cell->{width};
            W: for ($x + $cell->{width} .. $table->{width} - 1) {
              my $_cell = $table->{cell}->[$_]->[$y];
              for (@{$_cell or []}) {
                if ($_->{element} and not $_->{is_empty}) {
                  last W; # not empty
                }
              }
              $header_width++;
            } # W

            ## 2.
            my $_x = $x + $header_width;

            ## 3.
            HORIZONTAL: {
              last HORIZONTAL if $_x == $table->{width}; # goto Vertical

              ## 4. # goto Vertical
              last HORIZONTAL
                  if $table->{cell}->[$_x]->[$y] and
                      $table->{cell}->[$_x]->[$y]->[0] and # anchored
                      $table->{cell}->[$_x]->[$y]->[0]->{is_header};

              ## 5.
              for my $_y ($y .. $y + $cell->{height} - 1) {
                $assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
              }

              ## 6.
              $_x++;

              ## 7.
              redo HORIZONTAL;
            } # HORIZONTAL

            ## 8. Vertical
            my $_y = $y + $cell->{height};

            VERTICAL: {
              ## 9. # goto END
              last VERTICAL if $_y == $table->{height};

              ## 10.
              if ($table->{cell}->[$x]->[$_y]) {
                my $h_cell = $table->{cell}->[$x]->[$_y]->[0]; # anchored cell
                if ($h_cell and $h_cell->{is_header}) {
                  ## 10.1.
                  my $width = $h_cell->{width};
                  W: for ($h_cell->{x} + $width .. $table->{width} - 1) {
                    my $_cell = $table->{cell}->[$_]->[$y];
                    for (@{$_cell or []}) {
                      if ($_->{element} and not $_->{is_empty}) {
                        last W; # not empty
                      }
                    }
                    $width++;
                  } # W
                    
                  ## 10.2. # goto end
                  last VERTICAL if $width == $header_width;
                } # 10.
              }

              ## 11.
              for my $_x ($x .. $x + $header_width - 1) {
                $assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
              }

              ## 12.
              $_y++;

              ## 13. # goto vertical (wrong)
              redo VERTICAL;
            } # VERTICAL

            ## 14. End
            # (we have already done)
          }
        } else { # data cell
          
        }
      }
    }
  }


  ## NOTE: The "tree order" constraints in the spec algorithm are irrelevant
  ## in fact.
} # assign_header

1;
## $Date: 2008/05/05 08:36:55 $
1	wakaba	1.1	package Whatpm::HTMLTable;
2			use strict;
3
4			## An implementation of "Forming a table" algorithm in HTML5
5	wakaba	1.9	sub form_table ($$$;$) {
6			my (undef, $table_el, $onerror, $must_level) = @_;
7	wakaba	1.2	$onerror \|\|= sub { };
8	wakaba	1.9	$must_level \|\|= 'm';
9	wakaba	1.1
10			## Step 1
11	wakaba	1.7	my $x_width = 0;
12	wakaba	1.1
13			## Step 2
14	wakaba	1.7	my $y_height = 0;
15	wakaba	1.1	my $y_max_node;
16	wakaba	1.8
17			## Step 3
18			my $pending_tfoot = [];
19	wakaba	1.1
20	wakaba	1.8	## Step 4
21	wakaba	1.1	my $table = {
22			#caption
23			column => [],
24			column_group => [],
25	wakaba	1.9	row => [], ## NOTE: HTML5 algorithm doesn't associate rows with <tr>s.
26	wakaba	1.1	row_group => [],
27			cell => [],
28	wakaba	1.11	height => 0,
29			width => 0,
30	wakaba	1.1	};
31
32	wakaba	1.9	my @column_has_anchored_cell;
33			my @row_has_anchored_cell;
34	wakaba	1.1	my @column_generated_by;
35	wakaba	1.9	my @row_generated_by;
36
37			## Step 5
38			my @table_child = @{$table_el->child_nodes};
39			return $table unless @table_child;
40
41	wakaba	1.10	## Step 6
42			for (0..$#table_child) {
43			my $el = $table_child[$_];
44			next unless $el->node_type == 1; # ELEMENT_NODE
45			next unless $el->manakai_local_name eq 'caption';
46			my $nsuri = $el->namespace_uri;
47			next unless defined $nsuri;
48			next unless $nsuri eq q<http://www.w3.org/1999/xhtml>;
49			$table->{caption} = {element => $el};
50			splice @table_child, $_, 1, ();
51			last;
52			}
53
54	wakaba	1.9	my $process_row_group;
55			my $end = sub {
56	wakaba	1.10	## Step 19 (End)
57	wakaba	1.9	for (@$pending_tfoot) {
58			$process_row_group->($_);
59			}
60
61	wakaba	1.10	## Step 20
62	wakaba	1.7	for (0 .. $x_width - 1) {
63	wakaba	1.9	unless ($column_has_anchored_cell[$_]) {
64	wakaba	1.1	if ($table->{column}->[$_]) {
65			$onerror->(type => 'column with no anchored cell',
66	wakaba	1.9	node => $table->{column}->[$_]->{element},
67			level => $must_level);
68	wakaba	1.1	} else {
69	wakaba	1.4	$onerror->(type => 'colspan creates column with no anchored cell',
70	wakaba	1.9	node => $column_generated_by[$_],
71			level => $must_level);
72	wakaba	1.1	}
73	wakaba	1.9	last; # only one error.
74	wakaba	1.1	}
75			}
76	wakaba	1.9	for (0 .. $y_height - 1) {
77			unless ($row_has_anchored_cell[$_]) {
78			if ($table->{row}->[$_]) {
79			$onerror->(type => 'row with no anchored cell',
80			node => $table->{row}->[$_]->{element},
81			level => $must_level);
82			} else {
83			$onerror->(type => 'rowspan creates row with no anchored cell',
84			node => $row_generated_by[$_],
85			level => $must_level);
86			}
87			last; # only one error.
88			}
89			}
90
91	wakaba	1.10	## Step 21
92	wakaba	1.9	#return $table;
93			}; # $end
94	wakaba	1.1
95	wakaba	1.10	## Step 7, 8
96	wakaba	1.1	my $current_element;
97			my $current_ln;
98			NEXT_CHILD: {
99			$current_element = shift @table_child;
100			if (defined $current_element) {
101			redo NEXT_CHILD unless $current_element->node_type == 1;
102			my $nsuri = $current_element->namespace_uri;
103			redo NEXT_CHILD unless defined $nsuri and
104			$nsuri eq q<http://www.w3.org/1999/xhtml>;
105			$current_ln = $current_element->manakai_local_name;
106
107			redo NEXT_CHILD unless {
108			colgroup => 1,
109			thead => 1,
110			tbody => 1,
111			tfoot => 1,
112			tr => 1,
113			}->{$current_ln};
114			} else {
115	wakaba	1.8	## Step 6 2nd paragraph
116	wakaba	1.9	$end->();
117	wakaba	1.11	$table->{width} = $x_width;
118			$table->{height} = $y_height;
119	wakaba	1.9	return $table;
120	wakaba	1.1	}
121			} # NEXT_CHILD
122
123	wakaba	1.10	## Step 9
124			while ($current_ln eq 'colgroup') { # Step 9, Step 9.4
125			## Step 9.1: column groups
126	wakaba	1.1	my @col = grep {
127			$_->node_type == 1 and
128			defined $_->namespace_uri and
129			$_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
130			$_->manakai_local_name eq 'col'
131			} @{$current_element->child_nodes};
132			if (@col) {
133			## Step 1
134	wakaba	1.7	my $x_start = $x_width;
135	wakaba	1.1
136			## Step 2, 6
137			while (@col) {
138			my $current_column = shift @col;
139
140			## Step 3: columns
141			my $span = 1;
142			my $col_span = $current_column->get_attribute_ns (undef, 'span');
143			## Parse non-negative integer
144			if (defined $col_span and $col_span =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
145			$span = $1 \|\| 1;
146			}
147			## ISSUE: If span=0, what is /span/ value?
148
149			## Step 4, 5
150	wakaba	1.11	$table->{column}->[$x_width++] = {element => $current_column}
151	wakaba	1.7	for 1..$span;
152	wakaba	1.1	}
153
154			## Step 7
155			my $cg = {element => $current_element,
156	wakaba	1.7	x => $x_start, y => 0,
157			width => $x_width - $x_start};
158			$table->{column_group}->[$_] = $cg for $x_start .. $x_width - 1;
159	wakaba	1.1	} else { # no <col> children
160			## Step 1
161			my $span = 1;
162			my $col_span = $current_element->get_attribute_ns (undef, 'span');
163			## Parse non-negative integer
164			if (defined $col_span and $col_span =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
165			$span = $1 \|\| 1;
166			}
167			## ISSUE: If span=0, what is /span/ value?
168
169			## Step 2
170	wakaba	1.7	$x_width += $span;
171	wakaba	1.1
172			## Step 3
173			my $cg = {element => $current_element,
174	wakaba	1.7	x => $x_width - $span, y => 0,
175	wakaba	1.1	width => $span};
176	wakaba	1.7	$table->{column_group}->[$_] = $cg for $cg->{x} .. $x_width - 1;
177	wakaba	1.1	}
178
179	wakaba	1.10	## Step 9.2, 9.3
180	wakaba	1.1	NEXT_CHILD: {
181			$current_element = shift @table_child;
182			if (defined $current_element) {
183			redo NEXT_CHILD unless $current_element->node_type == 1;
184			my $nsuri = $current_element->namespace_uri;
185			redo NEXT_CHILD unless defined $nsuri and
186			$nsuri eq q<http://www.w3.org/1999/xhtml>;
187			$current_ln = $current_element->manakai_local_name;
188
189			redo NEXT_CHILD unless {
190			colgroup => 1,
191			thead => 1,
192			tbody => 1,
193			tfoot => 1,
194			tr => 1,
195			}->{$current_ln};
196			} else {
197			## End of subsection
198	wakaba	1.9
199	wakaba	1.1	## Step 5 of overall steps 2nd paragraph
200	wakaba	1.9	$end->();
201	wakaba	1.11	$table->{width} = $x_width;
202			$table->{height} = $y_height;
203	wakaba	1.9	return $table;
204	wakaba	1.1	}
205			} # NEXT_CHILD
206			}
207
208	wakaba	1.10	## Step 10
209	wakaba	1.1	my $y_current = 0;
210
211	wakaba	1.10	## Step 11
212	wakaba	1.1	my @downward_growing_cells;
213
214			my $growing_downward_growing_cells = sub {
215			for (@downward_growing_cells) {
216			for my $x ($_->[1] .. ($_->[1] + $_->[2] - 1)) {
217			$table->{cell}->[$x]->[$y_current] = [$_->[0]];
218			$_->[0]->{height}++;
219			}
220			}
221			}; # $growing_downward_growing_cells
222
223			my $process_row = sub {
224			## Step 1
225	wakaba	1.7	$y_height++ if $y_height == $y_current;
226	wakaba	1.1
227			## Step 2
228	wakaba	1.7	my $x_current = 0;
229
230	wakaba	1.1	## Step 3
231			my $tr = shift;
232	wakaba	1.9	$table->{row}->[$y_current] = {element => $tr};
233	wakaba	1.1	my @tdth = grep {
234			$_->node_type == 1 and
235			defined $_->namespace_uri and
236			$_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
237			{td => 1, th => 1}->{$_->manakai_local_name}
238			} @{$tr->child_nodes};
239	wakaba	1.7	my $current_cell = shift @tdth;
240
241			## Step 4
242			$growing_downward_growing_cells->();
243	wakaba	1.1
244	wakaba	1.9	return unless $current_cell;
245			## ISSUE: Support for empty <tr></tr> (removed at revision 1376).
246
247	wakaba	1.7	CELL: while (1) {
248			## Step 5: cells
249	wakaba	1.1	$x_current++
250	wakaba	1.7	while ($x_current < $x_width and
251	wakaba	1.1	$table->{cell}->[$x_current]->[$y_current]);
252
253	wakaba	1.7	## Step 6
254			$x_width++ if $x_current == $x_width;
255
256	wakaba	1.1	## Step 7
257			my $colspan = 1;
258			my $attr_value = $current_cell->get_attribute_ns (undef, 'colspan');
259			if (defined $attr_value and $attr_value =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
260			$colspan = $1 \|\| 1;
261			}
262
263	wakaba	1.7	## Step 8
264	wakaba	1.1	my $rowspan = 1;
265			my $attr_value = $current_cell->get_attribute_ns (undef, 'rowspan');
266			if (defined $attr_value and $attr_value =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
267			$rowspan = $1;
268			}
269
270	wakaba	1.7	## Step 9
271	wakaba	1.1	my $cell_grows_downward;
272			if ($rowspan == 0) {
273			$cell_grows_downward = 1;
274			$rowspan = 1;
275			}
276
277	wakaba	1.7	## Step 10
278			if ($x_width < $x_current + $colspan) {
279	wakaba	1.1	@column_generated_by[$_] = $current_cell
280	wakaba	1.7	for $x_width .. $x_current + $colspan - 1;
281			$x_width = $x_current + $colspan;
282	wakaba	1.1	}
283
284	wakaba	1.7	## Step 11
285			if ($y_height < $y_current + $rowspan) {
286	wakaba	1.9	@row_generated_by[$_] = $current_cell
287			for $y_height .. $y_current + $rowspan - 1;
288	wakaba	1.7	$y_height = $y_current + $rowspan;
289	wakaba	1.1	$y_max_node = $current_cell;
290			}
291
292	wakaba	1.7	## Step 12
293	wakaba	1.1	my $cell = {
294	wakaba	1.2	is_header => ($current_cell->manakai_local_name eq 'th'),
295	wakaba	1.1	element => $current_cell,
296			x => $x_current, y => $y_current,
297			width => $colspan, height => $rowspan,
298			};
299	wakaba	1.9	$column_has_anchored_cell[$x_current] = 1;
300			$row_has_anchored_cell[$y_current] = 1;
301	wakaba	1.1	for my $x ($x_current .. ($x_current + $colspan - 1)) {
302			for my $y ($y_current .. ($y_current + $rowspan - 1)) {
303			unless ($table->{cell}->[$x]->[$y]) {
304			$table->{cell}->[$x]->[$y] = [$cell];
305			} else {
306	wakaba	1.9	$onerror->(type => "cell overlapping:$x:$y", node => $current_cell,
307			level => $must_level);
308	wakaba	1.1	push @{$table->{cell}->[$x]->[$y]}, $cell;
309			}
310			}
311			}
312	wakaba	1.11
313			## Whether the cell is an empty data cell or not
314			if (not $cell->{is_header}) {
315			$cell->{is_empty} = 1;
316			for my $node (@{$current_cell->child_nodes}) {
317			my $nt = $node->node_type;
318			if ($nt == 3 or $nt == 4) { # TEXT_NODE / CDATA_SECTION_NODE
319			if ($node->data =~ /\P{Zs}/) { ## TOOD: non-Zs class
320			delete $cell->{is_empty};
321			last;
322			}
323			} elsif ($nt == 1) { # ELEMENT_NODE
324			delete $cell->{is_empty};
325			last;
326			}
327			}
328			## NOTE: Entity references are not supported
329			}
330	wakaba	1.1
331	wakaba	1.7	## Step 13
332	wakaba	1.1	if ($cell_grows_downward) {
333			push @downward_growing_cells, [$cell, $x_current, $colspan];
334			}
335
336	wakaba	1.7	## Step 14
337	wakaba	1.1	$x_current += $colspan;
338	wakaba	1.7
339			## Step 15-17
340			$current_cell = shift @tdth;
341			if (defined $current_cell) {
342			## Step 16-17
343			#
344			} else {
345			## Step 15
346			$y_current++;
347			last CELL;
348			}
349			} # CELL
350	wakaba	1.1	}; # $process_row
351
352	wakaba	1.9	$process_row_group = sub ($) {
353	wakaba	1.8	## Step 1
354			my $y_start = $y_height;
355
356			## Step 2
357			for (grep {
358			$_->node_type == 1 and
359			defined $_->namespace_uri and
360			$_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
361			$_->manakai_local_name eq 'tr'
362			} @{$_[0]->child_nodes}) {
363			$process_row->($_);
364			}
365
366			## Step 3
367			if ($y_height > $y_start) {
368			my $rg = {element => $current_element, ## ISSUE: "element being processed"?
369			x => 0, y => $y_start,
370			height => $y_height - $y_start};
371			$table->{row_group}->[$_] = $rg for $y_start .. $y_height - 1;
372			}
373
374			## Step 4
375			## Ending a row group
376			## Step 1
377			while ($y_current < $y_height) {
378			## Step 1
379			$growing_downward_growing_cells->();
380
381			## Step 2
382			$y_current++;
383			}
384	wakaba	1.9	## Step 2
385	wakaba	1.8	@downward_growing_cells = ();
386			}; # $process_row_group
387
388	wakaba	1.10	## Step 12: rows
389	wakaba	1.1	unshift @table_child, $current_element;
390			ROWS: {
391			NEXT_CHILD: {
392			$current_element = shift @table_child;
393			if (defined $current_element) {
394			redo NEXT_CHILD unless $current_element->node_type == 1;
395			my $nsuri = $current_element->namespace_uri;
396			redo NEXT_CHILD unless defined $nsuri and
397			$nsuri eq q<http://www.w3.org/1999/xhtml>;
398			$current_ln = $current_element->manakai_local_name;
399
400			redo NEXT_CHILD unless {
401			thead => 1,
402			tbody => 1,
403			tfoot => 1,
404			tr => 1,
405			}->{$current_ln};
406			} else {
407	wakaba	1.8	## Step 6 2nd paragraph
408	wakaba	1.9	$end->();
409	wakaba	1.11	$table->{width} = $x_width;
410			$table->{height} = $y_height;
411	wakaba	1.9	return $table;
412	wakaba	1.1	}
413			} # NEXT_CHILD
414
415	wakaba	1.10	## Step 13
416	wakaba	1.1	if ($current_ln eq 'tr') {
417			$process_row->($current_element);
418	wakaba	1.8	# advance (done at the first of ROWS)
419	wakaba	1.1	redo ROWS;
420			}
421
422	wakaba	1.10	## Step 14
423	wakaba	1.1	## Ending a row group
424			## Step 1
425	wakaba	1.7	while ($y_current < $y_height) {
426	wakaba	1.1	## Step 1
427	wakaba	1.9	$growing_downward_growing_cells->();
428
429			## Step 2
430	wakaba	1.1	$y_current++;
431			}
432	wakaba	1.9	## Step 2
433	wakaba	1.1	@downward_growing_cells = ();
434
435	wakaba	1.10	## Step 15
436	wakaba	1.8	if ($current_ln eq 'tfoot') {
437			push @$pending_tfoot, $current_element;
438			# advance (done at the top of ROWS)
439			redo ROWS;
440	wakaba	1.1	}
441
442	wakaba	1.10	## Step 16
443	wakaba	1.8	# thead or tbody
444			$process_row_group->($current_element);
445	wakaba	1.1
446	wakaba	1.10	## Step 17
447	wakaba	1.8	# Advance (done at the top of ROWS).
448	wakaba	1.1
449	wakaba	1.10	## Step 18
450	wakaba	1.8	redo ROWS;
451	wakaba	1.1	} # ROWS
452	wakaba	1.8
453	wakaba	1.9	$end->();
454	wakaba	1.11	$table->{width} = $x_width;
455			$table->{height} = $y_height;
456	wakaba	1.8	return $table;
457	wakaba	1.1	} # form_table
458
459	wakaba	1.11	sub assign_header ($$;$$) {
460			my (undef, $table, $onerror, $must_level) = @_;
461			$onerror \|\|= sub { };
462			$must_level \|\|= 'm';
463
464			my $assign_header = sub ($$$) {
465			my $_cell = shift;
466			my ($x, $y) = @_;
467
468			for my $__cell (@{$_cell or []}) {
469			if ($__cell and $__cell->{element} and
470			not $__cell->{is_header} and
471			not $__cell->{element}->has_attribute_ns (undef, 'headers')) {
472			$__cell->{header}->{$x}->{$y} = 1;
473			}
474			}
475			}; # $assign_header
476
477			for my $x (0 .. $table->{width} - 1) {
478			for my $y (0 .. $table->{height} - 1) {
479			my $cell = $table->{cell}->[$x]->[$y];
480			$cell = $cell->[0] if $cell; # anchored cell is always ->{cell}[][][0].
481			next if $cell->{x} != $x;
482			next if $cell->{y} != $y;
483			if ($cell) {
484			if ($cell->{is_header}) {
485			my $scope = $cell->{element}->get_attribute_ns (undef, 'scope');
486			$scope = $scope ? lc $scope : ''; ## TODO: case
487			if ($scope eq 'row') {
488			for my $_x ($x + $cell->{width} .. $table->{width} - 1) {
489			for my $_y ($y .. $y + $cell->{height} - 1) {
490			$assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
491			}
492			}
493			} elsif ($scope eq 'col') {
494			for my $_x ($x .. $x + $cell->{width} - 1) {
495			for my $_y ($y .. $table->{height} - 1) {
496			$assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
497			}
498			}
499			} elsif ($scope eq 'rowgroup') {
500			## NOTE: A cell cannot exceed across a row group boundary.
501			if ($table->{row_group}->[$y] and
502			$table->{row_group}->[$y]->{height}) {
503			for my $_x ($x .. $table->{width} - 1) {
504			for my $_y ($y ..
505			$table->{row_group}->[$y]->{y} +
506			$table->{row_group}->[$y]->{height} - 1) {
507			$assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
508			}
509			}
510			}
511			## TODO: Should we raise a warning?
512			} elsif ($scope eq 'colgroup') {
513			if ($table->{column_group}->[$x] and
514			$table->{column_group}->{width} and
515			$table->{column_group}->[$x]->{x} == $x) { # anchored
516			for my $_x ($x ..
517			$table->{column_group}->[$x]->{x} +
518			$table->{column_group}->[$x]->{width} - 1) {
519			for my $_y ($y .. $table->{height} - 1) {
520			$assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
521			}
522			}
523			}
524			## TODO: Warning?
525			} else { # auto
526			## 1.
527			my $header_width = $cell->{width};
528			W: for ($x + $cell->{width} .. $table->{width} - 1) {
529			my $_cell = $table->{cell}->[$_]->[$y];
530			for (@{$_cell or []}) {
531			if ($_->{element} and not $_->{is_empty}) {
532			last W; # not empty
533			}
534			}
535			$header_width++;
536			} # W
537
538			## 2.
539			my $_x = $x + $header_width;
540
541			## 3.
542			HORIZONTAL: {
543			last HORIZONTAL if $_x == $table->{width}; # goto Vertical
544
545			## 4. # goto Vertical
546			last HORIZONTAL
547			if $table->{cell}->[$_x]->[$y] and
548			$table->{cell}->[$_x]->[$y]->[0] and # anchored
549			$table->{cell}->[$_x]->[$y]->[0]->{is_header};
550
551			## 5.
552			for my $_y ($y .. $y + $cell->{height} - 1) {
553			$assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
554			}
555
556			## 6.
557			$_x++;
558
559			## 7.
560			redo HORIZONTAL;
561			} # HORIZONTAL
562
563			## 8. Vertical
564			my $_y = $y + $cell->{height};
565
566			VERTICAL: {
567			## 9. # goto END
568			last VERTICAL if $_y == $table->{height};
569
570			## 10.
571			if ($table->{cell}->[$x]->[$_y]) {
572			my $h_cell = $table->{cell}->[$x]->[$_y]->[0]; # anchored cell
573			if ($h_cell and $h_cell->{is_header}) {
574			## 10.1.
575			my $width = $h_cell->{width};
576			W: for ($h_cell->{x} + $width .. $table->{width} - 1) {
577			my $_cell = $table->{cell}->[$_]->[$y];
578			for (@{$_cell or []}) {
579			if ($_->{element} and not $_->{is_empty}) {
580			last W; # not empty
581			}
582			}
583			$width++;
584			} # W
585
586			## 10.2. # goto end
587			last VERTICAL if $width == $header_width;
588			} # 10.
589			}
590
591			## 11.
592			for my $_x ($x .. $x + $header_width - 1) {
593			$assign_header->($table->{cell}->[$_x]->[$_y] => $x, $y);
594			}
595
596			## 12.
597			$_y++;
598
599			## 13. # goto vertical (wrong)
600			redo VERTICAL;
601			} # VERTICAL
602
603			## 14. End
604			# (we have already done)
605			}
606			} else { # data cell
607
608			}
609			}
610			}
611			}
612
613
614			## NOTE: The "tree order" constraints in the spec algorithm are irrelevant
615			## in fact.
616			} # assign_header
617	wakaba	1.1
618			1;
619	wakaba	1.11	## $Date: 2008/05/05 08:36:55 $