1 | ###########################################################################
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2 | #
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3 | # HBSPlug.pm -- plugin for processing simple html (or text) books
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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 multi-level document from document containing
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27 | # <<TOC>> level tags. Metadata for each section is taken from any
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28 | # other tags on the same line as the <<TOC>>. e.g. <<Title>>xxxx<</Title>>
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29 | # sets Title metadata.
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30 |
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31 | # Everything else between TOC tags is treated as simple html (i.e. no
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32 | # processing of html links or any other HTMLPlug type stuff is done).
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33 |
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34 | # expects input files to have a .hb file extension by default (this can be
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35 | # changed by adding a -process_exp option
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36 |
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37 | # a file with the same name as the hb file but a .jpg extension is
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38 | # taken as the cover image (jpg files are blocked by this plugin)
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39 |
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40 | # HBSPlug is a simplification (and extension of) the HBPlug used
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41 | # by the Humanity Library collections. HBSPlug is faster as it expects
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42 | # the input files to be cleaner (The input to the HDL collections
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43 | # contains lots of excess html tags around <<TOC>> tags, uses <<I>>
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44 | # tags to specify images, and simply takes all text between <<TOC>>
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45 | # tags and start of text to be Title metadata). If you're marking up
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46 | # documents to be displayed in the same way as the HDL collections,
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47 | # use this plugin instead of HBPlug.
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48 |
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49 | package HBSPlug;
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50 |
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51 | use BasPlug;
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52 | use util;
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53 |
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54 | sub BEGIN {
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55 | @ISA = ('BasPlug');
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56 | }
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57 |
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58 | use strict;
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59 |
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60 | sub new {
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61 | my ($class) = @_;
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62 | my $self = new BasPlug ("HBSPlug", @_);
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63 |
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64 | return bless $self, $class;
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65 | }
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66 |
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67 | sub get_default_block_exp {
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68 | my $self = shift (@_);
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69 |
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70 | return q^\.jpg$^;
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71 | }
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72 |
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73 | sub get_default_process_exp {
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74 | my $self = shift (@_);
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75 |
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76 | return q^(?i)\.hb$^;
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77 | }
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78 |
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79 | # do plugin specific processing of doc_obj
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80 | sub process {
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81 | my $self = shift (@_);
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82 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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83 |
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84 | print STDERR "HBSPlug: processing $file\n"
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85 | if $self->{'verbosity'} > 1;
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86 |
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87 | my $cursection = $doc_obj->get_top_section();
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88 |
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89 | my $filename = &util::filename_cat($base_dir, $file);
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90 | my $absdir = $filename;
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91 | $absdir =~ s/[^\/\\]*$//;
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92 |
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93 | # add the cover image
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94 | my $coverimage = $filename;
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95 | $coverimage =~ s/\.[^\.]*$/\.jpg/i;
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96 | $doc_obj->associate_file($coverimage, "cover.jpg", "image/jpeg");
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97 |
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98 | my $title = "";
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99 |
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100 | # remove any leading rubbish
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101 | $$textref =~ s/^.*?(<<TOC)/$1/ios;
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102 |
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103 | my $curtoclevel = 1;
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104 | my $firstsection = 1;
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105 | my $toccount = 0;
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106 | while ($$textref =~ /\w/) {
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107 | $$textref =~ s/^<<TOC(\d+)>>([^\n]*)\n(.*?)(<<TOC|\Z)/$4/ios;
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108 | my $toclevel = $1;
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109 | my $metadata = $2;
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110 | my $sectiontext = $3;
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111 |
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112 | if ($toclevel == 2) {
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113 | $toccount ++;
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114 | }
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115 |
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116 | # close any sections below the current level and
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117 | # create a new section (special case for the firstsection)
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118 | while (($curtoclevel > $toclevel) ||
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119 | (!$firstsection && $curtoclevel == $toclevel)) {
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120 | $cursection = $doc_obj->get_parent_section ($cursection);
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121 | $curtoclevel--;
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122 | }
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123 | if ($curtoclevel+1 < $toclevel) {
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124 | print STDERR "WARNING - jump in toc levels in $filename " .
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125 | "from $curtoclevel to $toclevel\n";
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126 | }
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127 | while ($curtoclevel < $toclevel) {
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128 | $curtoclevel++;
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129 | $cursection =
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130 | $doc_obj->insert_section($doc_obj->get_end_child($cursection));
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131 | }
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132 |
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133 | # sort out metadata
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134 | while ($metadata =~ s/^.*?<<([^>]*)>>(.*?)<<[^>]*>>//) {
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135 | my $metakey = $1;
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136 | my $metavalue = $2;
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137 |
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138 | if ($metavalue ne "" && $metakey ne "") {
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139 | # make sure key fits in with gsdl naming scheme
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140 | $metakey =~ tr/[A-Z]/[a-z]/;
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141 | $metakey = ucfirst ($metakey);
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142 | $doc_obj->add_utf8_metadata ($cursection, $metakey, $metavalue);
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143 | }
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144 | }
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145 |
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146 | # remove header rubbish
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147 | $sectiontext =~ s/^.*?<body[^>]*>//ios;
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148 |
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149 | # and any other unwanted tags
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150 | $sectiontext =~ s/<(\/p|\/html|\/body)>//isg;
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151 |
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152 | # fix up the image links
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153 | $sectiontext =~ s/(<img[^>]*?src\s*=\s*\"?)([^\">]+)(\"?[^>]*>)/
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154 | &replace_image_links($absdir, $doc_obj, $1, $2, $3)/isge;
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155 |
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156 | # add the text
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157 | $doc_obj->add_utf8_text($cursection, $sectiontext);
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158 |
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159 | $firstsection = 0;
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160 |
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161 | $$textref =~ s/^\s+//s;
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162 | }
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163 |
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164 | return 1;
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165 | }
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166 |
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167 | sub replace_image_links {
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168 |
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169 | my ($dir, $doc_obj, $front, $link, $back) = @_;
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170 |
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171 | my ($filename, $error);
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172 | my $foundimage = 0;
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173 |
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174 | $link =~ s/\/\///;
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175 | my ($imagetype) = $link =~ /([^\.]*)$/;
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176 | $imagetype =~ tr/[A-Z]/[a-z]/;
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177 | if ($imagetype eq "jpg") {$imagetype = "jpeg";}
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178 | if ($imagetype !~ /^(jpeg|gif|png)$/) {
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179 | print STDERR "HBSPlug: Warning - unknown image type ($imagetype)\n";
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180 | }
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181 | my ($imagefile) = $link =~ /([^\/]*)$/;
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182 | my ($imagepath) = $link =~ /^[^\/]*(.*)$/;
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183 |
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184 | if (defined $imagepath && $imagepath =~ /\w/) {
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185 | # relative link
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186 | $filename = &util::filename_cat ($dir, $imagepath);
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187 | if (-e $filename) {
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188 | $doc_obj->associate_file ($filename, $imagefile, "image/$imagetype");
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189 | $foundimage = 1;
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190 | } else {
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191 | $error = "HBSPlug: Warning - couldn't find image file $imagefile in either $filename or";
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192 | }
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193 | }
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194 |
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195 | if (!$foundimage) {
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196 | $filename = &util::filename_cat ($dir, $imagefile);
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197 | if (-e $filename) {
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198 | $doc_obj->associate_file ($filename, $imagefile, "image/$imagetype");
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199 | $foundimage = 1;
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200 | } elsif (defined $error) {
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201 | print STDERR "$error $filename\n";
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202 | } else {
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203 | print STDERR "HBSPlug: Warning - couldn't find image file $imagefile in $filename\n";
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204 | }
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205 | }
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206 |
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207 | if ($foundimage) {
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208 | return "${front}_httpdocimg_/${imagefile}${back}";
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209 | } else {
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210 | return "";
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211 | }
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212 | }
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213 |
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214 | 1;
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