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 => [],
  };
  
  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;

  my $process_row_group;
  my $end = sub {
    ## Step 20 (End)
    for (@$pending_tfoot) {
      $process_row_group->($_);
    }
    
    ## Step 21
    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 22
    #return $table;
  }; # $end

  ## Step 6, 7, 9
  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;

      if ($current_ln eq 'caption' and not defined $table->{caption}) {
        ## Step 8
        $table->{caption} = {element => $current_element};
        redo NEXT_CHILD; # Step 9
      }

      redo NEXT_CHILD unless {
        #caption => 1, ## Step 7
        colgroup => 1,
        thead => 1,
        tbody => 1,
        tfoot => 1,
        tr => 1,
      }->{$current_ln};
    } else {
      ## End of subsection

      ## Step 6 2nd paragraph
      $end->();
      return $table;
    }
  } # NEXT_CHILD

  ## Step 10
  while ($current_ln eq 'colgroup') { # Step 10, Step 10.4
    ## Step 10.1: 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 10.2, 10.3
    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->();
        return $table;
      }
    } # NEXT_CHILD
  }

  ## Step 11
  my $y_current = 0;

  ## Step 12
  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;
          }
        }
      }
      
      ## 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 13: 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->();
        return $table;
      }
    } # NEXT_CHILD

    ## Step 14
    if ($current_ln eq 'tr') {
      $process_row->($current_element);
      # advance (done at the first of ROWS)
      redo ROWS;
    }

    ## Step 15
    ## 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 16
    if ($current_ln eq 'tfoot') {
      push @$pending_tfoot, $current_element;
      # advance (done at the top of ROWS)
      redo ROWS;
    }

    ## Step 17
    # thead or tbody
    $process_row_group->($current_element);

    ## Step 18
    # Advance (done at the top of ROWS).

    ## Step 19
    redo ROWS;
  } # ROWS

  $end->();
  return $table;
} # form_table

## TODO: Implement scope="" algorithm

1;
## $Date: 2008/05/05 06:57:07 $
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 $table = {
22			#caption
23			column => [],
24			column_group => [],
25	wakaba	1.9	row => [], ## NOTE: HTML5 algorithm doesn't associate rows with <tr>s.
26	wakaba	1.1	row_group => [],
27			cell => [],
28			};
29
30	wakaba	1.9	my @column_has_anchored_cell;
31			my @row_has_anchored_cell;
32	wakaba	1.1	my @column_generated_by;
33	wakaba	1.9	my @row_generated_by;
34
35			## Step 5
36			my @table_child = @{$table_el->child_nodes};
37			return $table unless @table_child;
38
39			my $process_row_group;
40			my $end = sub {
41			## Step 20 (End)
42			for (@$pending_tfoot) {
43			$process_row_group->($_);
44			}
45
46			## Step 21
47	wakaba	1.7	for (0 .. $x_width - 1) {
48	wakaba	1.9	unless ($column_has_anchored_cell[$_]) {
49	wakaba	1.1	if ($table->{column}->[$_]) {
50			$onerror->(type => 'column with no anchored cell',
51	wakaba	1.9	node => $table->{column}->[$_]->{element},
52			level => $must_level);
53	wakaba	1.1	} else {
54	wakaba	1.4	$onerror->(type => 'colspan creates column with no anchored cell',
55	wakaba	1.9	node => $column_generated_by[$_],
56			level => $must_level);
57	wakaba	1.1	}
58	wakaba	1.9	last; # only one error.
59	wakaba	1.1	}
60			}
61	wakaba	1.9	for (0 .. $y_height - 1) {
62			unless ($row_has_anchored_cell[$_]) {
63			if ($table->{row}->[$_]) {
64			$onerror->(type => 'row with no anchored cell',
65			node => $table->{row}->[$_]->{element},
66			level => $must_level);
67			} else {
68			$onerror->(type => 'rowspan creates row with no anchored cell',
69			node => $row_generated_by[$_],
70			level => $must_level);
71			}
72			last; # only one error.
73			}
74			}
75
76			## Step 22
77			#return $table;
78			}; # $end
79	wakaba	1.1
80	wakaba	1.8	## Step 6, 7, 9
81	wakaba	1.1	my $current_element;
82			my $current_ln;
83			NEXT_CHILD: {
84			$current_element = shift @table_child;
85			if (defined $current_element) {
86			redo NEXT_CHILD unless $current_element->node_type == 1;
87			my $nsuri = $current_element->namespace_uri;
88			redo NEXT_CHILD unless defined $nsuri and
89			$nsuri eq q<http://www.w3.org/1999/xhtml>;
90			$current_ln = $current_element->manakai_local_name;
91
92			if ($current_ln eq 'caption' and not defined $table->{caption}) {
93	wakaba	1.8	## Step 8
94	wakaba	1.1	$table->{caption} = {element => $current_element};
95	wakaba	1.8	redo NEXT_CHILD; # Step 9
96	wakaba	1.1	}
97
98			redo NEXT_CHILD unless {
99	wakaba	1.8	#caption => 1, ## Step 7
100	wakaba	1.1	colgroup => 1,
101			thead => 1,
102			tbody => 1,
103			tfoot => 1,
104			tr => 1,
105			}->{$current_ln};
106			} else {
107			## End of subsection
108	wakaba	1.9
109	wakaba	1.8	## Step 6 2nd paragraph
110	wakaba	1.9	$end->();
111			return $table;
112	wakaba	1.1	}
113			} # NEXT_CHILD
114
115	wakaba	1.8	## Step 10
116			while ($current_ln eq 'colgroup') { # Step 10, Step 10.4
117			## Step 10.1: column groups
118	wakaba	1.1	my @col = grep {
119			$_->node_type == 1 and
120			defined $_->namespace_uri and
121			$_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
122			$_->manakai_local_name eq 'col'
123			} @{$current_element->child_nodes};
124			if (@col) {
125			## Step 1
126	wakaba	1.7	my $x_start = $x_width;
127	wakaba	1.1
128			## Step 2, 6
129			while (@col) {
130			my $current_column = shift @col;
131
132			## Step 3: columns
133			my $span = 1;
134			my $col_span = $current_column->get_attribute_ns (undef, 'span');
135			## Parse non-negative integer
136			if (defined $col_span and $col_span =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
137			$span = $1 \|\| 1;
138			}
139			## ISSUE: If span=0, what is /span/ value?
140
141			## Step 4, 5
142	wakaba	1.7	$table->{column}->[++$x_width] = {element => $current_column}
143			for 1..$span;
144	wakaba	1.1	}
145
146			## Step 7
147			my $cg = {element => $current_element,
148	wakaba	1.7	x => $x_start, y => 0,
149			width => $x_width - $x_start};
150			$table->{column_group}->[$_] = $cg for $x_start .. $x_width - 1;
151	wakaba	1.1	} else { # no <col> children
152			## Step 1
153			my $span = 1;
154			my $col_span = $current_element->get_attribute_ns (undef, 'span');
155			## Parse non-negative integer
156			if (defined $col_span and $col_span =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
157			$span = $1 \|\| 1;
158			}
159			## ISSUE: If span=0, what is /span/ value?
160
161			## Step 2
162	wakaba	1.7	$x_width += $span;
163	wakaba	1.1
164			## Step 3
165			my $cg = {element => $current_element,
166	wakaba	1.7	x => $x_width - $span, y => 0,
167	wakaba	1.1	width => $span};
168	wakaba	1.7	$table->{column_group}->[$_] = $cg for $cg->{x} .. $x_width - 1;
169	wakaba	1.1	}
170
171	wakaba	1.8	## Step 10.2, 10.3
172	wakaba	1.1	NEXT_CHILD: {
173			$current_element = shift @table_child;
174			if (defined $current_element) {
175			redo NEXT_CHILD unless $current_element->node_type == 1;
176			my $nsuri = $current_element->namespace_uri;
177			redo NEXT_CHILD unless defined $nsuri and
178			$nsuri eq q<http://www.w3.org/1999/xhtml>;
179			$current_ln = $current_element->manakai_local_name;
180
181			redo NEXT_CHILD unless {
182			colgroup => 1,
183			thead => 1,
184			tbody => 1,
185			tfoot => 1,
186			tr => 1,
187			}->{$current_ln};
188			} else {
189			## End of subsection
190	wakaba	1.9
191	wakaba	1.1	## Step 5 of overall steps 2nd paragraph
192	wakaba	1.9	$end->();
193			return $table;
194	wakaba	1.1	}
195			} # NEXT_CHILD
196			}
197
198	wakaba	1.8	## Step 11
199	wakaba	1.1	my $y_current = 0;
200
201	wakaba	1.8	## Step 12
202	wakaba	1.1	my @downward_growing_cells;
203
204			my $growing_downward_growing_cells = sub {
205			for (@downward_growing_cells) {
206			for my $x ($_->[1] .. ($_->[1] + $_->[2] - 1)) {
207			$table->{cell}->[$x]->[$y_current] = [$_->[0]];
208			$_->[0]->{height}++;
209			}
210			}
211			}; # $growing_downward_growing_cells
212
213			my $process_row = sub {
214			## Step 1
215	wakaba	1.7	$y_height++ if $y_height == $y_current;
216	wakaba	1.1
217			## Step 2
218	wakaba	1.7	my $x_current = 0;
219
220	wakaba	1.1	## Step 3
221			my $tr = shift;
222	wakaba	1.9	$table->{row}->[$y_current] = {element => $tr};
223	wakaba	1.1	my @tdth = grep {
224			$_->node_type == 1 and
225			defined $_->namespace_uri and
226			$_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
227			{td => 1, th => 1}->{$_->manakai_local_name}
228			} @{$tr->child_nodes};
229	wakaba	1.7	my $current_cell = shift @tdth;
230
231			## Step 4
232			$growing_downward_growing_cells->();
233	wakaba	1.1
234	wakaba	1.9	return unless $current_cell;
235			## ISSUE: Support for empty <tr></tr> (removed at revision 1376).
236
237	wakaba	1.7	CELL: while (1) {
238			## Step 5: cells
239	wakaba	1.1	$x_current++
240	wakaba	1.7	while ($x_current < $x_width and
241	wakaba	1.1	$table->{cell}->[$x_current]->[$y_current]);
242
243	wakaba	1.7	## Step 6
244			$x_width++ if $x_current == $x_width;
245
246	wakaba	1.1	## Step 7
247			my $colspan = 1;
248			my $attr_value = $current_cell->get_attribute_ns (undef, 'colspan');
249			if (defined $attr_value and $attr_value =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
250			$colspan = $1 \|\| 1;
251			}
252
253	wakaba	1.7	## Step 8
254	wakaba	1.1	my $rowspan = 1;
255			my $attr_value = $current_cell->get_attribute_ns (undef, 'rowspan');
256			if (defined $attr_value and $attr_value =~ /^[\x09-\x0D\x20]*([0-9]+)/) {
257			$rowspan = $1;
258			}
259
260	wakaba	1.7	## Step 9
261	wakaba	1.1	my $cell_grows_downward;
262			if ($rowspan == 0) {
263			$cell_grows_downward = 1;
264			$rowspan = 1;
265			}
266
267	wakaba	1.7	## Step 10
268			if ($x_width < $x_current + $colspan) {
269	wakaba	1.1	@column_generated_by[$_] = $current_cell
270	wakaba	1.7	for $x_width .. $x_current + $colspan - 1;
271			$x_width = $x_current + $colspan;
272	wakaba	1.1	}
273
274	wakaba	1.7	## Step 11
275			if ($y_height < $y_current + $rowspan) {
276	wakaba	1.9	@row_generated_by[$_] = $current_cell
277			for $y_height .. $y_current + $rowspan - 1;
278	wakaba	1.7	$y_height = $y_current + $rowspan;
279	wakaba	1.1	$y_max_node = $current_cell;
280			}
281
282	wakaba	1.7	## Step 12
283	wakaba	1.1	my $cell = {
284	wakaba	1.2	is_header => ($current_cell->manakai_local_name eq 'th'),
285	wakaba	1.1	element => $current_cell,
286			x => $x_current, y => $y_current,
287			width => $colspan, height => $rowspan,
288			};
289	wakaba	1.9	$column_has_anchored_cell[$x_current] = 1;
290			$row_has_anchored_cell[$y_current] = 1;
291	wakaba	1.1	for my $x ($x_current .. ($x_current + $colspan - 1)) {
292			for my $y ($y_current .. ($y_current + $rowspan - 1)) {
293			unless ($table->{cell}->[$x]->[$y]) {
294			$table->{cell}->[$x]->[$y] = [$cell];
295			} else {
296	wakaba	1.9	$onerror->(type => "cell overlapping:$x:$y", node => $current_cell,
297			level => $must_level);
298	wakaba	1.1	push @{$table->{cell}->[$x]->[$y]}, $cell;
299			}
300			}
301			}
302
303	wakaba	1.7	## Step 13
304	wakaba	1.1	if ($cell_grows_downward) {
305			push @downward_growing_cells, [$cell, $x_current, $colspan];
306			}
307
308	wakaba	1.7	## Step 14
309	wakaba	1.1	$x_current += $colspan;
310	wakaba	1.7
311			## Step 15-17
312			$current_cell = shift @tdth;
313			if (defined $current_cell) {
314			## Step 16-17
315			#
316			} else {
317			## Step 15
318			$y_current++;
319			last CELL;
320			}
321			} # CELL
322	wakaba	1.1	}; # $process_row
323
324	wakaba	1.9	$process_row_group = sub ($) {
325	wakaba	1.8	## Step 1
326			my $y_start = $y_height;
327
328			## Step 2
329			for (grep {
330			$_->node_type == 1 and
331			defined $_->namespace_uri and
332			$_->namespace_uri eq q<http://www.w3.org/1999/xhtml> and
333			$_->manakai_local_name eq 'tr'
334			} @{$_[0]->child_nodes}) {
335			$process_row->($_);
336			}
337
338			## Step 3
339			if ($y_height > $y_start) {
340			my $rg = {element => $current_element, ## ISSUE: "element being processed"?
341			x => 0, y => $y_start,
342			height => $y_height - $y_start};
343			$table->{row_group}->[$_] = $rg for $y_start .. $y_height - 1;
344			}
345
346			## Step 4
347			## Ending a row group
348			## Step 1
349			while ($y_current < $y_height) {
350			## Step 1
351			$growing_downward_growing_cells->();
352
353			## Step 2
354			$y_current++;
355			}
356	wakaba	1.9	## Step 2
357	wakaba	1.8	@downward_growing_cells = ();
358			}; # $process_row_group
359
360			## Step 13: rows
361	wakaba	1.1	unshift @table_child, $current_element;
362			ROWS: {
363			NEXT_CHILD: {
364			$current_element = shift @table_child;
365			if (defined $current_element) {
366			redo NEXT_CHILD unless $current_element->node_type == 1;
367			my $nsuri = $current_element->namespace_uri;
368			redo NEXT_CHILD unless defined $nsuri and
369			$nsuri eq q<http://www.w3.org/1999/xhtml>;
370			$current_ln = $current_element->manakai_local_name;
371
372			redo NEXT_CHILD unless {
373			thead => 1,
374			tbody => 1,
375			tfoot => 1,
376			tr => 1,
377			}->{$current_ln};
378			} else {
379	wakaba	1.8	## Step 6 2nd paragraph
380	wakaba	1.9	$end->();
381			return $table;
382	wakaba	1.1	}
383			} # NEXT_CHILD
384
385	wakaba	1.8	## Step 14
386	wakaba	1.1	if ($current_ln eq 'tr') {
387			$process_row->($current_element);
388	wakaba	1.8	# advance (done at the first of ROWS)
389	wakaba	1.1	redo ROWS;
390			}
391
392	wakaba	1.8	## Step 15
393	wakaba	1.1	## Ending a row group
394			## Step 1
395	wakaba	1.7	while ($y_current < $y_height) {
396	wakaba	1.1	## Step 1
397	wakaba	1.9	$growing_downward_growing_cells->();
398
399			## Step 2
400	wakaba	1.1	$y_current++;
401			}
402	wakaba	1.9	## Step 2
403	wakaba	1.1	@downward_growing_cells = ();
404
405			## Step 16
406	wakaba	1.8	if ($current_ln eq 'tfoot') {
407			push @$pending_tfoot, $current_element;
408			# advance (done at the top of ROWS)
409			redo ROWS;
410	wakaba	1.1	}
411
412			## Step 17
413	wakaba	1.8	# thead or tbody
414			$process_row_group->($current_element);
415	wakaba	1.1
416			## Step 18
417	wakaba	1.8	# Advance (done at the top of ROWS).
418	wakaba	1.1
419			## Step 19
420	wakaba	1.8	redo ROWS;
421	wakaba	1.1	} # ROWS
422	wakaba	1.8
423	wakaba	1.9	$end->();
424	wakaba	1.8	return $table;
425	wakaba	1.1	} # form_table
426
427			## TODO: Implement scope="" algorithm
428
429			1;
430	wakaba	1.9	## $Date: 2008/05/05 06:57:07 $