1 | # plugin which process an HTML book directory
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2 |
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3 | package HBPlug;
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4 |
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5 | use html;
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6 | use BasPlug;
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7 |
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8 |
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9 | sub BEGIN {
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10 | @ISA = ('BasPlug');
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11 | }
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12 |
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13 | sub new {
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14 | my ($class) = @_;
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15 | $self = new BasPlug ();
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16 |
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17 | return bless $self, $class;
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18 | }
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19 |
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20 | sub is_recursive {
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21 | my $self = shift (@_);
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22 |
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23 | return 0; # this is not a recursive plugin
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24 | }
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25 |
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26 | sub HB_read_html_file {
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27 | my $self = shift (@_);
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28 | my ($htmlfile) = @_;
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29 |
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30 | # load in the file
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31 | if (!open (FILE, $htmlfile)) {
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32 | print STDERR "ERROR - could not open $htmlfile\n";
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33 | return "";
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34 | }
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35 |
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36 | my $line = "";
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37 | my $file = "";
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38 | my $foundbody = 0;
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39 | while (defined ($line = <FILE>)) {
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40 | # look for body tag
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41 | if (!$foundbody) {
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42 | if ($line =~ s/^.*<body[^>]*>//i) {
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43 | $foundbody = 1;
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44 | } else {
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45 | next;
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46 | }
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47 | }
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48 |
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49 | # check for symbol fonts
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50 | if ($line =~ /<font [^>]*?face\s*=\s*\"?(\w+)\"?/i) {
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51 | my $font = $1;
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52 | print STDERR "HBPlug::HB_read_html_file - warning font $font used\n"
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53 | if ($font !~ /^arial$/i);
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54 | }
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55 |
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56 |
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57 | $line =~ s/<\/p>//ig; # remove </p> tags
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58 | $line =~ s/<\/?(body|html|font)\b[^>]*>//ig; # remove any unwanted tags
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59 |
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60 | # convert any alphanumeric character entities to their extended
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61 | # ascii equivalent for indexing purposes
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62 | &html::convertcharentities ($line);
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63 |
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64 | $file .= $line;
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65 | }
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66 | close FILE;
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67 |
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68 | $file =~ s/\s+/ /g; # remove \n's
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69 |
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70 | return $file;
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71 | }
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72 |
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73 | sub HB_clean_section {
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74 | my $self = shift (@_);
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75 | my ($section) = @_;
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76 |
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77 | # remove tags without a starting tag from the section
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78 | my ($tag, $tagstart);
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79 | while ($section =~ /<\/([^>]{1,10})>/) {
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80 | $tag = $1;
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81 | $tagstart = index($section, "<$tag");
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82 | last if (($tagstart >= 0) && ($tagstart < index($section, "<\/$tag")));
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83 | $section =~ s/<\/$tag>//;
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84 | }
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85 |
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86 | # remove extra paragraph tags
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87 | while ($section =~ s/<p\b[^>]*>\s*<p\b/<p/ig) {}
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88 |
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89 | # remove extra stuff at the end of the section
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90 | while ($section =~ s/(<u>|<i>|<b>|<p\b[^>]*>| |\s)$//i) {}
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91 |
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92 | # add a newline at the beginning of each paragraph
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93 | $section =~ s/(.)\s*<p\b/$1\n\n<p/gi;
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94 |
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95 | # add a newline every 80 characters at a word boundary
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96 | # Note: this regular expression puts a line feed before
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97 | # the last word in each section, even when it is not
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98 | # needed.
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99 | $section =~ s/(.{1,80})\s/$1\n/g;
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100 |
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101 | # fix up the image links -- not sure what Rodger intended here - Stefan.
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102 | # $section =~ s/<img[^>]*?src=\"?([^\">]+)\"?[^>]*>/<img src=\"_linkOID_(_thisOID_\/$1)\"><br>/ig;
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103 | # $section =~ s/<<I>>\s*([^\.]+\.(png|jpg|gif))/<img src=\"_linkOID_(_thisOID_\/$1)\"><br>/ig;
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104 |
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105 | $section =~ s/<img[^>]*?src=\"?([^\">]+)\"?[^>]*>/<center><img src=\"_httpcollection_\/archives\/_thisOID_\/$1\"><\/center><br>/ig;
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106 | $section =~ s/<<I>>\s*([^\.]+\.(png|jpg|gif))/<center><img src=\"_httpcollection_\/archives\/_thisOID_\/$1\"><\/center><br>/ig;
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107 |
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108 | return $section;
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109 | }
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110 |
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111 |
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112 | sub shorten {
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113 | my $self = shift (@_);
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114 | my ($text) = @_;
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115 |
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116 | return "\"$text\"" if (length($text) < 100);
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117 |
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118 | return "\"" . substr ($text, 0, 50) . "\" ... \"" .
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119 | substr ($text, length($text)-50) . "\"";
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120 | }
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121 |
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122 |
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123 | # return 1 if processed, 0 if not processed
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124 | # Note that $base_dir might be "" and that $file might
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125 | # include directories
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126 | sub read {
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127 | my $self = shift (@_);
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128 | my ($pluginfo, $base_dir, $file, $metadata, $processor) = @_;
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129 |
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130 | # get the html filename and see if this is a HTML Book...
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131 | my ($jobnumber);
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132 | if ($file =~ /[\\\/]/) {
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133 | ($jobnumber) = $file =~ /[\\\/]([^\\\/]+)$/;
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134 | } else {
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135 | ($jobnumber) = $file =~ /^([^\\\/]+)$/;
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136 | }
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137 | return 0 unless defined $jobnumber;
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138 | my $htmlfile = "$base_dir$file/$jobnumber.htm";
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139 | return 0 unless -e $htmlfile;
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140 |
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141 | print STDERR "HBPlug: processing $file\n";
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142 |
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143 | # read in the file and do basic html cleaning (removing header etc)
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144 | my $html = $self->HB_read_html_file ($htmlfile);
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145 |
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146 | # create a new document
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147 | my $doc_obj = new doc ($file, "indexed_doc");
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148 |
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149 | # copy the book cover if it exists
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150 | my $bookcover = "$base_dir$file/$jobnumber.jpg";
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151 | $doc_obj->associate_file($bookcover, "cover.jpg", "image/jpeg")
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152 | if -e $bookcover;
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153 |
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154 | # process the file one section at a time
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155 | my $curtoclevel = 1;
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156 | my $cursection = $doc_obj->get_top_section();
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157 | my $firstsection = 1;
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158 | while (length ($html) > 0) {
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159 | if ($html =~ s/^.*?<p\b[^>]*>((<b>|<i>|<u>|\s)*)<<TOC(\d+)>>\s*(.*?)<p\b/<p/i) {
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160 | my $toclevel = $3;
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161 | my $title = $4;
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162 | my $sectiontext = "";
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163 | if ($html =~ s/^(.*?)(<p\b[^>]*>((<b>|<i>|<u>|\s)*)<<TOC\d+>>)/$2/i) {
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164 | $sectiontext = $1;
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165 | } else {
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166 | $sectiontext = $html;
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167 | $html = "";
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168 | }
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169 |
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170 | # remove tags and extra spaces from the title
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171 | $title =~ s/<\/?[^>]+>//g;
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172 | $title =~ s/^\s+|\s+$//g;
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173 |
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174 | # close any sections below the current level and
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175 | # create a new section (special case for the firstsection)
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176 | while (($curtoclevel > $toclevel) ||
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177 | (!$firstsection && $curtoclevel == $toclevel)) {
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178 | $cursection = $doc_obj->get_parent_section ($cursection);
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179 | $curtoclevel--;
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180 | }
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181 | if ($curtoclevel+1 < $toclevel) {
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182 | print STDERR "WARNING - jump in toc levels in $htmlfile " .
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183 | "from $curtoclevel to $toclevel\n";
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184 | }
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185 | while ($curtoclevel < $toclevel) {
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186 | $curtoclevel++;
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187 | $cursection =
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188 | $doc_obj->insert_section($doc_obj->get_end_child($cursection));
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189 | }
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190 |
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191 | # add the metadata to this section
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192 | if (!$firstsection || !defined($metadata->{'Title'})) {
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193 | $doc_obj->add_metadata ($cursection, "Title", $title);
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194 | }
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195 | if ($firstsection) {
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196 | foreach $field (keys(%$metadata)) {
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197 | # Subjects may be a colon separated list
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198 | if ($field eq "Subject") {
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199 | my @subjects = split /:/, $metadata->{'Subject'};
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200 | foreach $subject (@subjects) {
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201 | $doc_obj->add_metadata ($cursection, 'Subject', $subject);
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202 | }
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203 | } else {
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204 | $doc_obj->add_metadata ($cursection, $field, $metadata->{$field});
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205 | }
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206 | }
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207 | $firstsection = 0;
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208 | }
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209 |
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210 | # clean up the section html
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211 | $sectiontext = $self->HB_clean_section($sectiontext);
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212 |
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213 | # associate any files
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214 | # map { $doc_obj->associate_file("$base_dir$file/$1", $1)
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215 | # if /_linkOID_\(_thisOID_\/([^\)]+)\)/; 0; }
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216 | # split (/(_linkOID_\(_thisOID_\/[^\)]+\))/, $sectiontext);
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217 |
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218 | map { $doc_obj->associate_file("$base_dir$file/$1", $1)
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219 | if /_httpcollection_\/archives\/_thisOID_\/([^\"]+)\"/; 0; }
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220 | split (/(_httpcollection_\/archives\/_thisOID_\/[^\"]+\")/, $sectiontext);
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221 |
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222 | # add the text for this section
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223 | $doc_obj->add_text ($cursection, $sectiontext);
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224 |
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225 | } else {
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226 | print STDERR "WARNING - leftover text\n" , $self->shorten($html),
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227 | "\nin $htmlfile\n";
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228 | last;
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229 | }
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230 | }
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231 |
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232 | # add a OID
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233 | $doc_obj->set_OID ();
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234 |
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235 | print STDERR "OID: ", $doc_obj->get_OID(), "\n";
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236 |
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237 | # process the document
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238 | $processor->process($doc_obj);
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239 |
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240 | return 1; # processed the file
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241 | }
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242 |
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243 |
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244 | 1;
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