Whatpm/XML/Parser.pm.src

package Whatpm::XML::Parser;
use strict;

push our @ISA, 'Whatpm::HTML';
use Whatpm::HTML::Tokenizer qw/:token/;

sub parse_char_string ($$$;$$) {
  #my ($self, $s, $doc, $onerror, $get_wrapper) = @_;
  my $self = shift;
  my $s = ref $_[0] ? $_[0] : \($_[0]);
  require Whatpm::Charset::DecodeHandle;
  my $input = Whatpm::Charset::DecodeHandle::CharString->new ($s);
  return $self->parse_char_stream ($input, @_[1..$#_]);
} # parse_char_string

sub parse_char_stream ($$$;$$) {
  my $self = ref $_[0] ? shift : shift->new;
  my $input = $_[0];
  $self->{document} = $_[1];
  @{$self->{document}->child_nodes} = ();

  ## NOTE: |set_inner_html| copies most of this method's code

  $self->{confident} = 1 unless exists $self->{confident};
  $self->{document}->input_encoding ($self->{input_encoding})
      if defined $self->{input_encoding};
## TODO: |{input_encoding}| is needless?

  $self->{line_prev} = $self->{line} = 1;
  $self->{column_prev} = -1;
  $self->{column} = 0;
  $self->{set_nc} = sub {
    my $self = shift;

    my $char = '';
    if (defined $self->{next_nc}) {
      $char = $self->{next_nc};
      delete $self->{next_nc};
      $self->{nc} = ord $char;
    } else {
      $self->{char_buffer} = '';
      $self->{char_buffer_pos} = 0;

      my $count = $input->manakai_read_until
         ($self->{char_buffer}, qr/[^\x00\x0A\x0D]/, $self->{char_buffer_pos});
      if ($count) {
        $self->{line_prev} = $self->{line};
        $self->{column_prev} = $self->{column};
        $self->{column}++;
        $self->{nc}
            = ord substr ($self->{char_buffer}, $self->{char_buffer_pos}++, 1);
        return;
      }

      if ($input->read ($char, 1)) {
        $self->{nc} = ord $char;
      } else {
        $self->{nc} = -1;
        return;
      }
    }

    ($self->{line_prev}, $self->{column_prev})
        = ($self->{line}, $self->{column});
    $self->{column}++;
    
    if ($self->{nc} == 0x000A) { # LF
      !!!cp ('j1');
      $self->{line}++;
      $self->{column} = 0;
    } elsif ($self->{nc} == 0x000D) { # CR
      !!!cp ('j2');
## TODO: support for abort/streaming
      my $next = '';
      if ($input->read ($next, 1) and $next ne "\x0A") {
        $self->{next_nc} = $next;
      }
      $self->{nc} = 0x000A; # LF # MUST
      $self->{line}++;
      $self->{column} = 0;
    } elsif ($self->{nc} == 0x0000) { # NULL
      !!!cp ('j4');
      !!!parse-error (type => 'NULL');
      $self->{nc} = 0xFFFD; # REPLACEMENT CHARACTER # MUST
    }
  };

  $self->{read_until} = sub {
    #my ($scalar, $specials_range, $offset) = @_;
    return 0 if defined $self->{next_nc};

    my $pattern = qr/[^$_[1]\x00\x0A\x0D]/;
    my $offset = $_[2] || 0;

    if ($self->{char_buffer_pos} < length $self->{char_buffer}) {
      pos ($self->{char_buffer}) = $self->{char_buffer_pos};
      if ($self->{char_buffer} =~ /\G(?>$pattern)+/) {
        substr ($_[0], $offset)
            = substr ($self->{char_buffer}, $-[0], $+[0] - $-[0]);
        my $count = $+[0] - $-[0];
        if ($count) {
          $self->{column} += $count;
          $self->{char_buffer_pos} += $count;
          $self->{line_prev} = $self->{line};
          $self->{column_prev} = $self->{column} - 1;
          $self->{nc} = -1;
        }
        return $count;
      } else {
        return 0;
      }
    } else {
      my $count = $input->manakai_read_until ($_[0], $pattern, $_[2]);
      if ($count) {
        $self->{column} += $count;
        $self->{line_prev} = $self->{line};
        $self->{column_prev} = $self->{column} - 1;
        $self->{nc} = -1;
      }
      return $count;
    }
  }; # $self->{read_until}

  my $onerror = $_[2] || sub {
    my (%opt) = @_;
    my $line = $opt{token} ? $opt{token}->{line} : $opt{line};
    my $column = $opt{token} ? $opt{token}->{column} : $opt{column};
    warn "Parse error ($opt{type}) at line $line column $column\n";
  };
  $self->{parse_error} = sub {
    $onerror->(line => $self->{line}, column => $self->{column}, @_);
  };

  my $char_onerror = sub {
    my (undef, $type, %opt) = @_;
    !!!parse-error (layer => 'encode',
                    line => $self->{line}, column => $self->{column} + 1,
                    %opt, type => $type);
  }; # $char_onerror

  if ($_[3]) {
    $input = $_[3]->($input);
    $input->onerror ($char_onerror);
  } else {
    $input->onerror ($char_onerror) unless defined $input->onerror;
  }

  $self->_initialize_tokenizer;
  $self->_initialize_tree_constructor;
  $self->_construct_tree;
  $self->_terminate_tree_constructor;

  delete $self->{parse_error}; # remove loop

  return $self->{document};
} # parse_char_stream

sub new ($) {
  my $class = shift;
  my $self = bless {
    level => {must => 'm',
              should => 's',
              warn => 'w',
              info => 'i',
              uncertain => 'u'},
  }, $class;
  $self->{set_nc} = sub {
    $self->{nc} = -1;
  };
  $self->{parse_error} = sub {
    # 
  };
  $self->{change_encoding} = sub {
    # if ($_[0] is a supported encoding) {
    #   run "change the encoding" algorithm;
    #   throw Whatpm::HTML::RestartParser (charset => $new_encoding);
    # }
  };
  $self->{application_cache_selection} = sub {
    #
  };
  return $self;
} # new

sub _initialize_tree_constructor ($) {
  my $self = shift;
  ## NOTE: $self->{document} MUST be specified before this method is called
  $self->{document}->strict_error_checking (0);
  ## TODO: Turn mutation events off # MUST
  $self->{document}->dom_config
      ->{'http://suika.fam.cx/www/2006/dom-config/strict-document-children'}
      = 0;
  $self->{document}->manakai_is_html (0);
  $self->{document}->set_user_data (manakai_source_line => 1);
  $self->{document}->set_user_data (manakai_source_column => 1);
} # _initialize_tree_constructor

sub _terminate_tree_constructor ($) {
  my $self = shift;
  $self->{document}->strict_error_checking (1);
  $self->{document}->dom_config
      ->{'http://suika.fam.cx/www/2006/dom-config/strict-document-children'}
      = 1;
  ## TODO: Turn mutation events on
} # _terminate_tree_constructor

## Tree construction stage


## NOTE: Differences from the XML5 draft are marked as "XML5:".

## XML5: No namespace support.

## XML5: XML5 has "empty tag token".  In this implementation, it is
## represented as a start tag token with $token->{self_closing} flag
## set to true.

## XML5: XML5 has "short end tag token".  In this implementation, it
## is represented as an end tag token with $token->{tag_name} flag set
## to an empty string.

## XML5: Start, main, end phases.  In this implementation, they are
## represented by insertion modes.

## Insertion modes
sub INITIAL_IM () { 0 }
sub BEFORE_ROOT_ELEMENT_IM () { 1 }
sub IN_ELEMENT_IM () { 2 }
sub AFTER_ROOT_ELEMENT_IM () { 3 }

{
my $token; ## TODO: change to $self->{t}

sub _construct_tree ($) {
  my ($self) = @_;

  !!!next-token;

  delete $self->{tainted};
  $self->{open_elements} = [];
  $self->{insertion_mode} = INITIAL_IM;
  
  while (1) {
    if ($self->{insertion_mode} == IN_ELEMENT_IM) {
      $self->_tree_in_element;
    } elsif ($self->{insertion_mode} == AFTER_ROOT_ELEMENT_IM) {
      $self->_tree_after_root_element;
    } elsif ($self->{insertion_mode} == BEFORE_ROOT_ELEMENT_IM) {
      $self->_tree_before_root_element;
    } elsif ($self->{insertion_mode} == INITIAL_IM) {
      $self->_tree_initial;
    } else {
      die "$0: Unknown XML insertion mode: $self->{insertion_mode}";
    }

    last if $token->{type} == ABORT_TOKEN;
  }
} # _construct_tree

sub _tree_initial ($) {
  my $self = shift;

  B: while (1) {
    if ($token->{type} == DOCTYPE_TOKEN) {
      ## XML5: No "DOCTYPE" token.
      
      my $doctype = $self->{document}->create_document_type_definition
          (defined $token->{name} ? $token->{name} : '');
      
      ## NOTE: Default value for both |public_id| and |system_id| attributes
      ## are empty strings, so that we don't set any value in missing cases.
      $doctype->public_id ($token->{public_identifier})
          if defined $token->{public_identifier};
      $doctype->system_id ($token->{system_identifier})
          if defined $token->{system_identifier};
      
      ## TODO: internal_subset
      
      $self->{document}->append_child ($doctype);
      
      $self->{insertion_mode} = BEFORE_ROOT_ELEMENT_IM;
      !!!next-token;
      return;
    } elsif ($token->{type} == START_TAG_TOKEN or
             $token->{type} == END_OF_FILE_TOKEN) {
      $self->{insertion_mode} = BEFORE_ROOT_ELEMENT_IM;
      ## Reprocess.
      return;
    } elsif ($token->{type} == COMMENT_TOKEN) {
      my $comment = $self->{document}->create_comment ($token->{data});
      $self->{document}->append_child ($comment);
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == PI_TOKEN) {
      my $pi = $self->{document}->create_processing_instruction
          ($token->{target}, $token->{data});
      $self->{document}->append_child ($pi);

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == CHARACTER_TOKEN) {
      if (not $self->{tainted} and
          $token->{data} =~ s/^([\x09\x0A\x0C\x20]+)//) {
        #
      }
      
      if (length $token->{data}) {
        ## XML5: Ignore the token.

        unless ($self->{tainted}) {
          !!!parse-error (type => 'text outside of root element',
                          token => $token);
          $self->{tainted} = 1;
        }

        $self->{document}->manakai_append_text ($token->{data});
      }

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == END_TAG_TOKEN) {
      !!!parse-error (type => 'unmatched end tag',
                      text => $token->{tag_name},
                      token => $token);
      ## Ignore the token.
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == ABORT_TOKEN) {
      return;
    } else {
      die "$0: XML parser initial: Unknown token type $token->{type}";
    }
  } # B
} # _tree_initial

sub _tree_before_root_element ($) {
  my $self = shift;

  B: while (1) {
    if ($token->{type} == START_TAG_TOKEN) {
      my $ns; ## TODO:
      my $el = $self->{document}->create_element_ns ($ns, $token->{tag_name});
      $self->{document}->append_child ($el);

      if ($token->{self_closing}) {
        !!!ack ('ack');
        $self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
      } else {
        push @{$self->{open_elements}}, [$el, $token->{tag_name}];
        $self->{insertion_mode} = IN_ELEMENT_IM;
      }

      #delete $self->{tainted};

      !!!next-token;
      return;
    } elsif ($token->{type} == COMMENT_TOKEN) {
      my $comment = $self->{document}->create_comment ($token->{data});
      $self->{document}->append_child ($comment);
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == PI_TOKEN) {
      my $pi = $self->{document}->create_processing_instruction
          ($token->{target}, $token->{data});
      $self->{document}->append_child ($pi);

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == CHARACTER_TOKEN) {
      if (not $self->{tainted} and
          $token->{data} =~ s/^([\x09\x0A\x0C\x20]+)//) {
        #
      }
      
      if (length $token->{data}) {
        ## XML5: Ignore the token.

        unless ($self->{tainted}) {
          !!!parse-error (type => 'text outside of root element',
                          token => $token);
          $self->{tainted} = 1;
        }

        $self->{document}->manakai_append_text ($token->{data});
      }

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == END_OF_FILE_TOKEN) {
      !!!parse-error (type => 'no root element',
                      token => $token);
      
      $self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
      ## Reprocess.
      return;
    } elsif ($token->{type} == END_TAG_TOKEN) {
      !!!parse-error (type => 'unmatched end tag',
                      text => $token->{tag_name},
                      token => $token);
      ## Ignore the token.

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == DOCTYPE_TOKEN) {
      !!!parse-error (type => 'in html:#doctype',
                      token => $token);
      ## Ignore the token.
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == ABORT_TOKEN) {
      return;
    } else {
      die "$0: XML parser initial: Unknown token type $token->{type}";
    }
  } # B
} # _tree_before_root_element

sub _tree_in_element ($) {
  my $self = shift;
  
  B: while (1) {
    if ($token->{type} == CHARACTER_TOKEN) {
      $self->{open_elements}->[-1]->[0]->manakai_append_text ($token->{data});
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == START_TAG_TOKEN) {
      my $ns; ## TODO:
      my $el = $self->{document}->create_element_ns ($ns, $token->{tag_name});
      $self->{open_elements}->[-1]->[0]->append_child ($el);

      if ($token->{self_closing}) {
        !!!ack ('ack');
      } else {
        push @{$self->{open_elements}}, [$el, $token->{tag_name}];
      }
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == END_TAG_TOKEN) {
      if ($self->{tag_name} eq '') {
        ## Short end tag token.
        pop @{$self->{open_elements}};
      } elsif ($self->{open_elements}->[-1]->[1] eq $token->{tag_name}) {
        pop @{$self->{open_elements}};
      } else {
        !!!parse-error (type => 'unmatched end tag',
                        text => $token->{tag_name},
                        token => $token);
        
        ## Has an element in scope
        INSCOPE: for my $i (reverse $#{$self->{open_elements}}..0) {
          if ($self->{open_elements}->[$i]->[1] eq $token->{tag_name}) {
            splice @{$self->{open_elements}}, $i;
            last INSCOPE;
          }
        } # INSCOPE
      }
      
      unless (@{$self->{open_elements}}) {
        $self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
        !!!next-token;
        return;
      } else {
        ## Stay in the state.
        !!!next-token;
        redo B;
      }
    } elsif ($token->{type} == COMMENT_TOKEN) {
      my $comment = $self->{document}->create_comment ($token->{data});
      $self->{open_elements}->[-1]->[0]->append_child ($comment);
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == PI_TOKEN) {
      my $pi = $self->{document}->create_processing_instruction
          ($token->{target}, $token->{data});
      $self->{open_elements}->[-1]->[0]->append_child ($pi);

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == END_OF_FILE_TOKEN) {
      !!!parse-error (type => 'in body:#eof',
                      token => $token);
      
      $self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
      !!!next-token;
      return;
    } elsif ($token->{type} == DOCTYPE_TOKEN) {
      !!!parse-error (type => 'in html:#doctype',
                      token => $token);
      ## Ignore the token.
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == ABORT_TOKEN) {
      return;
    } else {
      die "$0: XML parser initial: Unknown token type $token->{type}";
    }
  } # B
} # _tree_in_element

sub _tree_after_root_element ($) {
  my $self = shift;

  B: while (1) {
    if ($token->{type} == START_TAG_TOKEN) {
      !!!parse-error (type => 'second root element',
                      token => $token);

      ## XML5: Ignore the token.
      
      my $ns; ## TODO:
      my $el = $self->{document}->create_element_ns ($ns, $token->{tag_name});
      $self->{document}->append_child ($el);
      
      if ($token->{self_closing}) {
        !!!ack ('ack');
        ## Stay in the mode.
      } else {
        push @{$self->{open_elements}}, [$el, $token->{tag_name}];
        $self->{insertion_mode} = IN_ELEMENT_IM;
      }
      
      #delete $self->{tainted};

      !!!next-token;
      return;
    } elsif ($token->{type} == COMMENT_TOKEN) {
      my $comment = $self->{document}->create_comment ($token->{data});
      $self->{document}->append_child ($comment);
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == PI_TOKEN) {
      my $pi = $self->{document}->create_processing_instruction
          ($token->{target}, $token->{data});
      $self->{document}->append_child ($pi);

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == CHARACTER_TOKEN) {
      if (not $self->{tainted} and
          $token->{data} =~ s/^([\x09\x0A\x0C\x20]+)//) {
        #
      }
      
      if (length $token->{data}) {
        ## XML5: Ignore the token.

        unless ($self->{tainted}) {
          !!!parse-error (type => 'text outside of root element',
                          token => $token);
          $self->{tainted} = 1;
        }

        $self->{document}->manakai_append_text ($token->{data});
      }

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == END_OF_FILE_TOKEN) {
      ## Stop parsing.

      ## TODO: implement "stop parsing".

      $token = {type => ABORT_TOKEN};
      return;
    } elsif ($token->{type} == END_TAG_TOKEN) {
      !!!parse-error (type => 'unmatched end tag',
                      text => $token->{tag_name},
                      token => $token);
      ## Ignore the token.

      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == DOCTYPE_TOKEN) {
      !!!parse-error (type => 'in html:#doctype',
                      token => $token);
      ## Ignore the token.
      
      ## Stay in the mode.
      !!!next-token;
      next B;
    } elsif ($token->{type} == ABORT_TOKEN) {
      return;
    } else {
      die "$0: XML parser initial: Unknown token type $token->{type}";
    }
  } # B
} # _tree_after_root_element

}

1;
1	wakaba	1.1	package Whatpm::XML::Parser;
2			use strict;
3
4			push our @ISA, 'Whatpm::HTML';
5			use Whatpm::HTML::Tokenizer qw/:token/;
6
7			sub parse_char_string ($$$;$$) {
8			#my ($self, $s, $doc, $onerror, $get_wrapper) = @_;
9			my $self = shift;
10			my $s = ref $_[0] ? $_[0] : \($_[0]);
11			require Whatpm::Charset::DecodeHandle;
12			my $input = Whatpm::Charset::DecodeHandle::CharString->new ($s);
13			return $self->parse_char_stream ($input, @_[1..$#_]);
14			} # parse_char_string
15
16			sub parse_char_stream ($$$;$$) {
17			my $self = ref $_[0] ? shift : shift->new;
18			my $input = $_[0];
19			$self->{document} = $_[1];
20			@{$self->{document}->child_nodes} = ();
21
22			## NOTE: \|set_inner_html\| copies most of this method's code
23
24			$self->{confident} = 1 unless exists $self->{confident};
25			$self->{document}->input_encoding ($self->{input_encoding})
26			if defined $self->{input_encoding};
27			## TODO: \|{input_encoding}\| is needless?
28
29			$self->{line_prev} = $self->{line} = 1;
30			$self->{column_prev} = -1;
31			$self->{column} = 0;
32			$self->{set_nc} = sub {
33			my $self = shift;
34
35			my $char = '';
36			if (defined $self->{next_nc}) {
37			$char = $self->{next_nc};
38			delete $self->{next_nc};
39			$self->{nc} = ord $char;
40			} else {
41			$self->{char_buffer} = '';
42			$self->{char_buffer_pos} = 0;
43
44			my $count = $input->manakai_read_until
45			($self->{char_buffer}, qr/[^\x00\x0A\x0D]/, $self->{char_buffer_pos});
46			if ($count) {
47			$self->{line_prev} = $self->{line};
48			$self->{column_prev} = $self->{column};
49			$self->{column}++;
50			$self->{nc}
51			= ord substr ($self->{char_buffer}, $self->{char_buffer_pos}++, 1);
52			return;
53			}
54
55			if ($input->read ($char, 1)) {
56			$self->{nc} = ord $char;
57			} else {
58			$self->{nc} = -1;
59			return;
60			}
61			}
62
63			($self->{line_prev}, $self->{column_prev})
64			= ($self->{line}, $self->{column});
65			$self->{column}++;
66
67			if ($self->{nc} == 0x000A) { # LF
68			!!!cp ('j1');
69			$self->{line}++;
70			$self->{column} = 0;
71			} elsif ($self->{nc} == 0x000D) { # CR
72			!!!cp ('j2');
73			## TODO: support for abort/streaming
74			my $next = '';
75			if ($input->read ($next, 1) and $next ne "\x0A") {
76			$self->{next_nc} = $next;
77			}
78			$self->{nc} = 0x000A; # LF # MUST
79			$self->{line}++;
80			$self->{column} = 0;
81			} elsif ($self->{nc} == 0x0000) { # NULL
82			!!!cp ('j4');
83			!!!parse-error (type => 'NULL');
84			$self->{nc} = 0xFFFD; # REPLACEMENT CHARACTER # MUST
85			}
86			};
87
88			$self->{read_until} = sub {
89			#my ($scalar, $specials_range, $offset) = @_;
90			return 0 if defined $self->{next_nc};
91
92			my $pattern = qr/[^$_[1]\x00\x0A\x0D]/;
93			my $offset = $_[2] \|\| 0;
94
95			if ($self->{char_buffer_pos} < length $self->{char_buffer}) {
96			pos ($self->{char_buffer}) = $self->{char_buffer_pos};
97			if ($self->{char_buffer} =~ /\G(?>$pattern)+/) {
98			substr ($_[0], $offset)
99			= substr ($self->{char_buffer}, $-[0], $+[0] - $-[0]);
100			my $count = $+[0] - $-[0];
101			if ($count) {
102			$self->{column} += $count;
103			$self->{char_buffer_pos} += $count;
104			$self->{line_prev} = $self->{line};
105			$self->{column_prev} = $self->{column} - 1;
106			$self->{nc} = -1;
107			}
108			return $count;
109			} else {
110			return 0;
111			}
112			} else {
113			my $count = $input->manakai_read_until ($_[0], $pattern, $_[2]);
114			if ($count) {
115			$self->{column} += $count;
116			$self->{line_prev} = $self->{line};
117			$self->{column_prev} = $self->{column} - 1;
118			$self->{nc} = -1;
119			}
120			return $count;
121			}
122			}; # $self->{read_until}
123
124			my $onerror = $_[2] \|\| sub {
125			my (%opt) = @_;
126			my $line = $opt{token} ? $opt{token}->{line} : $opt{line};
127			my $column = $opt{token} ? $opt{token}->{column} : $opt{column};
128			warn "Parse error ($opt{type}) at line $line column $column\n";
129			};
130			$self->{parse_error} = sub {
131			$onerror->(line => $self->{line}, column => $self->{column}, @_);
132			};
133
134			my $char_onerror = sub {
135			my (undef, $type, %opt) = @_;
136			!!!parse-error (layer => 'encode',
137			line => $self->{line}, column => $self->{column} + 1,
138			%opt, type => $type);
139			}; # $char_onerror
140
141			if ($_[3]) {
142			$input = $_[3]->($input);
143			$input->onerror ($char_onerror);
144			} else {
145			$input->onerror ($char_onerror) unless defined $input->onerror;
146			}
147
148			$self->_initialize_tokenizer;
149			$self->_initialize_tree_constructor;
150			$self->_construct_tree;
151			$self->_terminate_tree_constructor;
152
153			delete $self->{parse_error}; # remove loop
154
155			return $self->{document};
156			} # parse_char_stream
157
158			sub new ($) {
159			my $class = shift;
160			my $self = bless {
161			level => {must => 'm',
162			should => 's',
163			warn => 'w',
164			info => 'i',
165			uncertain => 'u'},
166			}, $class;
167			$self->{set_nc} = sub {
168			$self->{nc} = -1;
169			};
170			$self->{parse_error} = sub {
171			#
172			};
173			$self->{change_encoding} = sub {
174			# if ($_[0] is a supported encoding) {
175			# run "change the encoding" algorithm;
176			# throw Whatpm::HTML::RestartParser (charset => $new_encoding);
177			# }
178			};
179			$self->{application_cache_selection} = sub {
180			#
181			};
182			return $self;
183			} # new
184
185			sub _initialize_tree_constructor ($) {
186			my $self = shift;
187			## NOTE: $self->{document} MUST be specified before this method is called
188			$self->{document}->strict_error_checking (0);
189			## TODO: Turn mutation events off # MUST
190			$self->{document}->dom_config
191			->{'http://suika.fam.cx/www/2006/dom-config/strict-document-children'}
192			= 0;
193			$self->{document}->manakai_is_html (0);
194			$self->{document}->set_user_data (manakai_source_line => 1);
195			$self->{document}->set_user_data (manakai_source_column => 1);
196			} # _initialize_tree_constructor
197
198			sub _terminate_tree_constructor ($) {
199			my $self = shift;
200			$self->{document}->strict_error_checking (1);
201			$self->{document}->dom_config
202			->{'http://suika.fam.cx/www/2006/dom-config/strict-document-children'}
203			= 1;
204			## TODO: Turn mutation events on
205			} # _terminate_tree_constructor
206
207			## Tree construction stage
208
209
210			## NOTE: Differences from the XML5 draft are marked as "XML5:".
211
212			## XML5: No namespace support.
213
214			## XML5: XML5 has "empty tag token". In this implementation, it is
215			## represented as a start tag token with $token->{self_closing} flag
216			## set to true.
217
218			## XML5: XML5 has "short end tag token". In this implementation, it
219			## is represented as an end tag token with $token->{tag_name} flag set
220			## to an empty string.
221
222			## XML5: Start, main, end phases. In this implementation, they are
223			## represented by insertion modes.
224
225			## Insertion modes
226			sub INITIAL_IM () { 0 }
227			sub BEFORE_ROOT_ELEMENT_IM () { 1 }
228			sub IN_ELEMENT_IM () { 2 }
229			sub AFTER_ROOT_ELEMENT_IM () { 3 }
230
231			{
232			my $token; ## TODO: change to $self->{t}
233
234			sub _construct_tree ($) {
235			my ($self) = @_;
236
237			!!!next-token;
238
239			delete $self->{tainted};
240			$self->{open_elements} = [];
241			$self->{insertion_mode} = INITIAL_IM;
242
243			while (1) {
244			if ($self->{insertion_mode} == IN_ELEMENT_IM) {
245			$self->_tree_in_element;
246			} elsif ($self->{insertion_mode} == AFTER_ROOT_ELEMENT_IM) {
247			$self->_tree_after_root_element;
248			} elsif ($self->{insertion_mode} == BEFORE_ROOT_ELEMENT_IM) {
249			$self->_tree_before_root_element;
250			} elsif ($self->{insertion_mode} == INITIAL_IM) {
251			$self->_tree_initial;
252			} else {
253			die "$0: Unknown XML insertion mode: $self->{insertion_mode}";
254			}
255
256			last if $token->{type} == ABORT_TOKEN;
257			}
258			} # _construct_tree
259
260			sub _tree_initial ($) {
261			my $self = shift;
262
263			B: while (1) {
264			if ($token->{type} == DOCTYPE_TOKEN) {
265			## XML5: No "DOCTYPE" token.
266
267			my $doctype = $self->{document}->create_document_type_definition
268			(defined $token->{name} ? $token->{name} : '');
269
270			## NOTE: Default value for both \|public_id\| and \|system_id\| attributes
271			## are empty strings, so that we don't set any value in missing cases.
272			$doctype->public_id ($token->{public_identifier})
273			if defined $token->{public_identifier};
274			$doctype->system_id ($token->{system_identifier})
275			if defined $token->{system_identifier};
276
277			## TODO: internal_subset
278
279			$self->{document}->append_child ($doctype);
280
281			$self->{insertion_mode} = BEFORE_ROOT_ELEMENT_IM;
282			!!!next-token;
283			return;
284			} elsif ($token->{type} == START_TAG_TOKEN or
285			$token->{type} == END_OF_FILE_TOKEN) {
286			$self->{insertion_mode} = BEFORE_ROOT_ELEMENT_IM;
287			## Reprocess.
288			return;
289			} elsif ($token->{type} == COMMENT_TOKEN) {
290			my $comment = $self->{document}->create_comment ($token->{data});
291			$self->{document}->append_child ($comment);
292
293			## Stay in the mode.
294			!!!next-token;
295			next B;
296			} elsif ($token->{type} == PI_TOKEN) {
297			my $pi = $self->{document}->create_processing_instruction
298			($token->{target}, $token->{data});
299			$self->{document}->append_child ($pi);
300
301			## Stay in the mode.
302			!!!next-token;
303			next B;
304			} elsif ($token->{type} == CHARACTER_TOKEN) {
305			if (not $self->{tainted} and
306			$token->{data} =~ s/^([\x09\x0A\x0C\x20]+)//) {
307			#
308			}
309
310			if (length $token->{data}) {
311			## XML5: Ignore the token.
312
313			unless ($self->{tainted}) {
314			!!!parse-error (type => 'text outside of root element',
315			token => $token);
316			$self->{tainted} = 1;
317			}
318
319			$self->{document}->manakai_append_text ($token->{data});
320			}
321
322			## Stay in the mode.
323			!!!next-token;
324			next B;
325			} elsif ($token->{type} == END_TAG_TOKEN) {
326			!!!parse-error (type => 'unmatched end tag',
327			text => $token->{tag_name},
328			token => $token);
329			## Ignore the token.
330
331			## Stay in the mode.
332			!!!next-token;
333			next B;
334			} elsif ($token->{type} == ABORT_TOKEN) {
335			return;
336			} else {
337			die "$0: XML parser initial: Unknown token type $token->{type}";
338			}
339			} # B
340			} # _tree_initial
341
342			sub _tree_before_root_element ($) {
343			my $self = shift;
344
345			B: while (1) {
346			if ($token->{type} == START_TAG_TOKEN) {
347			my $ns; ## TODO:
348			my $el = $self->{document}->create_element_ns ($ns, $token->{tag_name});
349			$self->{document}->append_child ($el);
350
351			if ($token->{self_closing}) {
352			!!!ack ('ack');
353			$self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
354			} else {
355			push @{$self->{open_elements}}, [$el, $token->{tag_name}];
356			$self->{insertion_mode} = IN_ELEMENT_IM;
357			}
358
359			#delete $self->{tainted};
360
361			!!!next-token;
362			return;
363			} elsif ($token->{type} == COMMENT_TOKEN) {
364			my $comment = $self->{document}->create_comment ($token->{data});
365			$self->{document}->append_child ($comment);
366
367			## Stay in the mode.
368			!!!next-token;
369			next B;
370			} elsif ($token->{type} == PI_TOKEN) {
371			my $pi = $self->{document}->create_processing_instruction
372			($token->{target}, $token->{data});
373			$self->{document}->append_child ($pi);
374
375			## Stay in the mode.
376			!!!next-token;
377			next B;
378			} elsif ($token->{type} == CHARACTER_TOKEN) {
379			if (not $self->{tainted} and
380			$token->{data} =~ s/^([\x09\x0A\x0C\x20]+)//) {
381			#
382			}
383
384			if (length $token->{data}) {
385			## XML5: Ignore the token.
386
387			unless ($self->{tainted}) {
388			!!!parse-error (type => 'text outside of root element',
389			token => $token);
390			$self->{tainted} = 1;
391			}
392
393			$self->{document}->manakai_append_text ($token->{data});
394			}
395
396			## Stay in the mode.
397			!!!next-token;
398			next B;
399			} elsif ($token->{type} == END_OF_FILE_TOKEN) {
400			!!!parse-error (type => 'no root element',
401			token => $token);
402
403			$self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
404			## Reprocess.
405			return;
406			} elsif ($token->{type} == END_TAG_TOKEN) {
407			!!!parse-error (type => 'unmatched end tag',
408			text => $token->{tag_name},
409			token => $token);
410			## Ignore the token.
411
412			## Stay in the mode.
413			!!!next-token;
414			next B;
415			} elsif ($token->{type} == DOCTYPE_TOKEN) {
416			!!!parse-error (type => 'in html:#doctype',
417			token => $token);
418			## Ignore the token.
419
420			## Stay in the mode.
421			!!!next-token;
422			next B;
423			} elsif ($token->{type} == ABORT_TOKEN) {
424			return;
425			} else {
426			die "$0: XML parser initial: Unknown token type $token->{type}";
427			}
428			} # B
429			} # _tree_before_root_element
430
431			sub _tree_in_element ($) {
432			my $self = shift;
433
434			B: while (1) {
435			if ($token->{type} == CHARACTER_TOKEN) {
436			$self->{open_elements}->[-1]->[0]->manakai_append_text ($token->{data});
437
438			## Stay in the mode.
439			!!!next-token;
440			next B;
441			} elsif ($token->{type} == START_TAG_TOKEN) {
442			my $ns; ## TODO:
443			my $el = $self->{document}->create_element_ns ($ns, $token->{tag_name});
444			$self->{open_elements}->[-1]->[0]->append_child ($el);
445
446			if ($token->{self_closing}) {
447			!!!ack ('ack');
448			} else {
449			push @{$self->{open_elements}}, [$el, $token->{tag_name}];
450			}
451
452			## Stay in the mode.
453			!!!next-token;
454			next B;
455			} elsif ($token->{type} == END_TAG_TOKEN) {
456			if ($self->{tag_name} eq '') {
457			## Short end tag token.
458			pop @{$self->{open_elements}};
459			} elsif ($self->{open_elements}->[-1]->[1] eq $token->{tag_name}) {
460			pop @{$self->{open_elements}};
461			} else {
462			!!!parse-error (type => 'unmatched end tag',
463			text => $token->{tag_name},
464			token => $token);
465
466			## Has an element in scope
467			INSCOPE: for my $i (reverse $#{$self->{open_elements}}..0) {
468			if ($self->{open_elements}->[$i]->[1] eq $token->{tag_name}) {
469			splice @{$self->{open_elements}}, $i;
470			last INSCOPE;
471			}
472			} # INSCOPE
473			}
474
475			unless (@{$self->{open_elements}}) {
476			$self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
477			!!!next-token;
478			return;
479			} else {
480			## Stay in the state.
481			!!!next-token;
482			redo B;
483			}
484			} elsif ($token->{type} == COMMENT_TOKEN) {
485			my $comment = $self->{document}->create_comment ($token->{data});
486			$self->{open_elements}->[-1]->[0]->append_child ($comment);
487
488			## Stay in the mode.
489			!!!next-token;
490			next B;
491			} elsif ($token->{type} == PI_TOKEN) {
492			my $pi = $self->{document}->create_processing_instruction
493			($token->{target}, $token->{data});
494			$self->{open_elements}->[-1]->[0]->append_child ($pi);
495
496			## Stay in the mode.
497			!!!next-token;
498			next B;
499			} elsif ($token->{type} == END_OF_FILE_TOKEN) {
500			!!!parse-error (type => 'in body:#eof',
501			token => $token);
502
503			$self->{insertion_mode} = AFTER_ROOT_ELEMENT_IM;
504			!!!next-token;
505			return;
506			} elsif ($token->{type} == DOCTYPE_TOKEN) {
507			!!!parse-error (type => 'in html:#doctype',
508			token => $token);
509			## Ignore the token.
510
511			## Stay in the mode.
512			!!!next-token;
513			next B;
514			} elsif ($token->{type} == ABORT_TOKEN) {
515			return;
516			} else {
517			die "$0: XML parser initial: Unknown token type $token->{type}";
518			}
519			} # B
520			} # _tree_in_element
521
522			sub _tree_after_root_element ($) {
523			my $self = shift;
524
525			B: while (1) {
526			if ($token->{type} == START_TAG_TOKEN) {
527			!!!parse-error (type => 'second root element',
528			token => $token);
529
530			## XML5: Ignore the token.
531
532			my $ns; ## TODO:
533			my $el = $self->{document}->create_element_ns ($ns, $token->{tag_name});
534			$self->{document}->append_child ($el);
535
536			if ($token->{self_closing}) {
537			!!!ack ('ack');
538			## Stay in the mode.
539			} else {
540			push @{$self->{open_elements}}, [$el, $token->{tag_name}];
541			$self->{insertion_mode} = IN_ELEMENT_IM;
542			}
543
544			#delete $self->{tainted};
545
546			!!!next-token;
547			return;
548			} elsif ($token->{type} == COMMENT_TOKEN) {
549			my $comment = $self->{document}->create_comment ($token->{data});
550			$self->{document}->append_child ($comment);
551
552			## Stay in the mode.
553			!!!next-token;
554			next B;
555			} elsif ($token->{type} == PI_TOKEN) {
556			my $pi = $self->{document}->create_processing_instruction
557			($token->{target}, $token->{data});
558			$self->{document}->append_child ($pi);
559
560			## Stay in the mode.
561			!!!next-token;
562			next B;
563			} elsif ($token->{type} == CHARACTER_TOKEN) {
564			if (not $self->{tainted} and
565			$token->{data} =~ s/^([\x09\x0A\x0C\x20]+)//) {
566			#
567			}
568
569			if (length $token->{data}) {
570			## XML5: Ignore the token.
571
572			unless ($self->{tainted}) {
573			!!!parse-error (type => 'text outside of root element',
574			token => $token);
575			$self->{tainted} = 1;
576			}
577
578			$self->{document}->manakai_append_text ($token->{data});
579			}
580
581			## Stay in the mode.
582			!!!next-token;
583			next B;
584			} elsif ($token->{type} == END_OF_FILE_TOKEN) {
585			## Stop parsing.
586
587			## TODO: implement "stop parsing".
588
589			$token = {type => ABORT_TOKEN};
590			return;
591			} elsif ($token->{type} == END_TAG_TOKEN) {
592			!!!parse-error (type => 'unmatched end tag',
593			text => $token->{tag_name},
594			token => $token);
595			## Ignore the token.
596
597			## Stay in the mode.
598			!!!next-token;
599			next B;
600			} elsif ($token->{type} == DOCTYPE_TOKEN) {
601			!!!parse-error (type => 'in html:#doctype',
602			token => $token);
603			## Ignore the token.
604
605			## Stay in the mode.
606			!!!next-token;
607			next B;
608			} elsif ($token->{type} == ABORT_TOKEN) {
609			return;
610			} else {
611			die "$0: XML parser initial: Unknown token type $token->{type}";
612			}
613			} # B
614			} # _tree_after_root_element
615
616			}
617
618			1;