1 | ###########################################################################
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2 | #
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3 | # GBHPlug.pm -- plugin for processing gb encoded html
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | # creates simple single-level document from .htm or .html files
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27 | # (case-insensitive match on filenames). Adds Title metadata
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28 | # taken from <title> tags if found otherwise first 100 characters
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29 | # outside of tags.
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30 | # will also attempt to include images which it will search for in
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31 | # the same directory as the document itself (it will also search
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32 | # directories relative to that directory).
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33 |
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34 | # this plugin currently does nothing with href links so relative links
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35 | # may become broken.
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36 |
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37 |
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38 | package GBHPlug;
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39 |
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40 | use BasPlug;
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41 | use sorttools;
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42 | use util;
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43 | use unicode;
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44 | use cnseg;
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45 | use gb;
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46 |
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47 |
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48 | sub BEGIN {
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49 | @ISA = ('BasPlug');
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50 | }
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51 |
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52 | sub new {
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53 | my ($class) = @_;
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54 | $self = new BasPlug ();
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55 |
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56 | return bless $self, $class;
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57 | }
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58 |
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59 | sub is_recursive {
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60 | my $self = shift (@_);
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61 |
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62 | return 0; # this is not a recursive plugin
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63 | }
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64 |
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65 |
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66 | # return number of files processed, undef if can't process
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67 | # Note that $base_dir might be "" and that $file might
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68 | # include directories
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69 | sub read {
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70 | my $self = shift (@_);
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71 | my ($pluginfo, $base_dir, $file, $metadata, $processor) = @_;
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72 |
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73 | my $filename = &util::filename_cat($base_dir, $file);
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74 | my $absdir = $filename;
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75 | $absdir =~ s/[^\/\\]*$//;
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76 |
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77 | return undef unless ($filename =~ /\.(html?(\.gz)?)$/i && (-e $filename));
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78 |
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79 | my $gz = 0;
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80 | if (defined $2) {
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81 | $gz = $2;
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82 | $gz = 1 if ($gz =~ /\.gz/i);
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83 | }
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84 |
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85 | print STDERR "GBHPlug: processing $filename\n" if $processor->{'verbosity'};
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86 |
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87 | # create a new document
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88 | my $doc_obj = new doc ($file, "indexed_doc");
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89 |
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90 | if ($gz) {
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91 | open (FILE, "zcat $filename |") || die "GBHPlug::read - ERROR: zcat can't open $filename\n";
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92 | } else {
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93 | open (FILE, $filename) || die "GBHPlug::read - ERROR: can't open $filename\n";
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94 | }
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95 | my $cursection = $doc_obj->get_top_section();
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96 |
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97 | my $text = "";
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98 | my $line = "";
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99 | my $title = "";
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100 | while (defined ($line = <FILE>)) {
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101 | $text .= $line;
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102 | }
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103 |
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104 | # convert to unicode
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105 | $text = &unicode::unicode2utf8(&gb::gb2unicode($text));
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106 | # segment the Chinese words
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107 | $text = &cnseg::segment($text);
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108 |
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109 | # we'll use the worthless alarm thingy to temporarily replace
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110 | # '\n' so we'd better check it doesn't occur naturally
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111 | if ($text =~ /\a/) {
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112 | print STDERR "GBHPlug::read - 'WARNING '\a' character occurs in text!!\n";
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113 | }
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114 |
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115 | # remove line breaks
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116 | $text =~ s/\n/\a/g;
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117 |
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118 | # see if there's a <title> tag
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119 | if ($text =~ /<title[^>]*>([^<]*)<\/title[^>]*>/i) {
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120 | if (defined $1) {
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121 | $title = $1;
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122 | }
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123 | }
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124 | # if no title use first 20 characters
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125 | if ($title eq "") {
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126 | my $tmptext = $text;
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127 | $tmptext =~ s/<[^>]*>//g;
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128 | $title = substr ($tmptext, 0, 20);
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129 | }
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130 |
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131 | if ($title ne "") {
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132 | $doc_obj->add_utf8_metadata ($cursection, "Title", $title);
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133 | }
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134 |
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135 | # remove header rubbish
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136 | $text =~ s/^.*?<body[^>]*>//i;
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137 |
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138 | # and any other unwanted tags
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139 | $text =~ s/<(\/p|\/html|\/body)>//g;
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140 |
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141 | # fix up the image links
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142 | $text =~ s/(<img[^>]*?src\s*=\s*\"?)([^\">]+)(\"?[^>]*>)/
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143 | &replace_image_links($absdir, $doc_obj, $1, $2, $3)/ige;
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144 |
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145 | # put line breaks back in
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146 | $text =~ s/\a/\n/g;
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147 |
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148 | # add the text
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149 | $doc_obj->add_utf8_text($cursection, $text);
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150 |
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151 | # assume that any metadata passed to this plugin is already utf8
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152 | foreach $field (keys(%$metadata)) {
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153 | # $metadata->{$field} may be an array reference
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154 | if (ref ($metadata->{$field}) eq "ARRAY") {
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155 | map {
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156 | $doc_obj->add_utf8_metadata ($cursection, $field, $_);
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157 | } @{$metadata->{$field}};
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158 | } else {
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159 | $doc_obj->add_utf8_metadata ($cursection, $field, $metadata->{$field});
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160 | }
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161 | }
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162 |
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163 | # add OID
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164 | $doc_obj->set_OID ();
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165 |
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166 | # process the document
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167 | $processor->process($doc_obj);
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168 |
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169 | return 1; # processed the file
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170 | }
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171 |
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172 | sub replace_image_links {
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173 |
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174 | my ($dir, $doc_obj, $front, $link, $back) = @_;
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175 |
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176 | my ($filename, $error);
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177 | my $foundimage = 0;
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178 |
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179 | $link =~ s/\/\///;
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180 | my ($imagetype) = $link =~ /([^\.]*)$/;
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181 | $imagetype =~ tr/[A-Z]/[a-z]/;
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182 | if ($imagetype eq "jpg") {$imagetype = "jpeg";}
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183 | if ($imagetype !~ /^(jpg|gif|png)$/) {
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184 | print STDERR "GBHPlug: Warning - unknown image type ($imagetype)\n";
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185 | }
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186 | my ($imagefile) = $link =~ /([^\/]*)$/;
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187 | my ($imagepath) = $link =~ /^[^\/]*(.*)$/;
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188 |
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189 | if (defined $imagepath && $imagepath =~ /\w/) {
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190 | # relative link
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191 | $filename = &util::filename_cat ($dir, $imagepath);
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192 | if (-e $filename) {
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193 | $doc_obj->associate_file ($filename, $imagefile, "image/$imagetype");
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194 | $foundimage = 1;
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195 | } else {
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196 | $error = "GBHPlug: Warning - couldn't find image file $imagefile in either $filename or";
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197 | }
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198 | }
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199 |
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200 | if (!$foundimage) {
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201 | $filename = &util::filename_cat ($dir, $imagefile);
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202 | if (-e $filename) {
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203 | $doc_obj->associate_file ($filename, $imagefile, "image/$imagetype");
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204 | $foundimage = 1;
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205 | } elsif (defined $error) {
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206 | print STDERR "$error $filename\n";
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207 | } else {
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208 | print STDERR "GBHPlug: Warning - couldn't find image file $imagefile in $filename\n";
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209 | }
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210 | }
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211 |
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212 | if ($foundimage) {
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213 | return "${front}_httpdocimg_/${imagefile}${back}";
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214 | } else {
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215 | return "";
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216 | }
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217 | }
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218 |
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219 | 1;
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220 |
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221 |
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222 |
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223 |
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224 |
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225 |
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226 |
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227 |
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228 |
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229 |
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230 |
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