1 | ###########################################################################
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2 | #
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3 | # parseargv.pm --
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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 | package parsargv;
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27 | #
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28 | # parse(ARGVREF, [SPEC, VARREF] ...)
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29 | #
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30 | # Parse command line arguments.
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31 | #
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32 | # ARGVREF is an array reference, usually to @ARGV. The remaining
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33 | # arguments are paired (SPEC, VARREF). SPEC is a specification string
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34 | # for a particular argument; VARREF is a variable reference that will
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35 | # receive the argument.
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36 | #
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37 | # SPEC is in one of the following forms:
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38 | #
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39 | # ARG/REGEX/DEFAULT ARG is the name of command line argument. REGEX is
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40 | # a regular expression that gives legal values for the argument.
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41 | # DEFAULT is the default value assigned to VARREF if the option does
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42 | # not appear on the command line. Example
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43 | #
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44 | #
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45 | # ARG/REGEX ARG and REGEX are as above. Since no default is given, ARG
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46 | # must appear on the command line; if it doesn't, parse() returns 0.
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47 | #
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48 | # ARG ARG is as above. ARG is a boolean option. VARREF is assigned 0 if ARG
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49 | # is not on the command line; 1 otherwise.
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50 | #
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51 | # SPEC may start with a punctuation character, in which case this
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52 | # character will be used instead of '/' as a delimiter. Useful when '/'
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53 | # is needed in the REGEX part.
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54 | #
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55 | # VARREF is a reference to a scalar or an array. If VARREF is an array
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56 | # reference, then multiple command line options are allowed an append. Example:
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57 | #
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58 | # Command line: -day mon -day fri
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59 | #
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60 | # parse(\@ARGV, "day/(mon|tue|wed|thu|fri)", \@days)
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61 | #
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62 | # days => ('mon', 'fri')
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63 | #
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64 | # Returns 0 if there was an error, nonzero otherwise.
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65 | #
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66 | sub parse
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67 | {
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68 | my $arglist = shift;
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69 | my ($spec, $var);
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70 | my %option;
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71 |
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72 | while (($spec, $var) = splice(@_, 0, 2))
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73 | {
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74 | die "Variable for $spec is not a valid type."
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75 | unless ref($var) eq 'SCALAR' || ref($var) eq 'ARRAY';
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76 |
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77 | my $delimiter;
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78 | if ($spec !~ /^\w/)
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79 | {
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80 | $delimiter = substr($spec, 0, 1);
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81 | $spec = substr($spec, 1);
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82 | }
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83 | else
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84 | {
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85 | $delimiter = '/';
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86 | }
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87 | my ($name, $regex, $default) = split(/$delimiter/, $spec, 3);
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88 |
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89 | if ($name)
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90 | {
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91 | if ($default && $default !~ /$regex/)
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92 | {
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93 | die "Default value for $name doesn't match regex ($spec).";
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94 | }
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95 | $option{$name} = {'name' => $name,
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96 | 'regex' => $regex,
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97 | 'default' => $default,
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98 | 'varref' => $var,
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99 | 'set' => 0};
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100 | }
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101 | else
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102 | {
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103 | die "Invalid argument ($spec) for parsargv.";
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104 | }
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105 | }
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106 |
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107 | my @argv;
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108 | my $arg;
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109 | my $parse_options = 1;
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110 | my $errors = 0;
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111 |
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112 | while ($arg = shift(@$arglist))
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113 | {
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114 | if ($parse_options && $arg eq '--')
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115 | {
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116 | $parse_options = 0;
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117 | next;
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118 | }
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119 |
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120 | if ($parse_options && $arg =~ /^-+\w/)
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121 | {
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122 | $arg =~ s/^-+//;
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123 |
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124 | if (defined $option{$arg})
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125 | {
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126 | &process_arg($option{$arg}, $arglist, \$errors);
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127 | }
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128 | else
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129 | {
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130 | print STDERR "$arg is not a valid option.\n";
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131 | $errors++;
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132 | }
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133 | }
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134 | else
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135 | {
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136 | push(@argv, $arg);
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137 | }
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138 | }
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139 | @$arglist = @argv;
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140 |
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141 | foreach $arg (keys %option)
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142 | {
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143 | if ($option{$arg}->{'set'} == 0)
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144 | {
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145 | if (defined $option{$arg}->{'default'})
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146 | {
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147 | &set_var($option{$arg}, $option{$arg}->{'default'});
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148 | }
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149 | elsif (!$option{$arg}->{'regex'})
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150 | {
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151 | &set_var($option{$arg}, 0)
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152 | }
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153 | elsif (ref($option{$arg}->{'varref'}) ne 'ARRAY')
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154 | {
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155 | print STDERR "Missing command line argument -$arg.\n";
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156 | $errors++;
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157 | }
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158 | }
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159 | }
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160 | return $errors == 0;
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161 | }
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162 |
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163 | sub process_arg
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164 | {
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165 | my ($option, $arglist, $errors) = @_;
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166 |
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167 | if ($option->{'regex'} && @$arglist > 0 && $arglist->[0] !~ /^-+\w/)
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168 | {
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169 | if ($arglist->[0] =~ /$option->{'regex'}/)
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170 | {
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171 | &set_var($option, shift(@$arglist));
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172 | }
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173 | else
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174 | {
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175 | print STDERR "Bad value for -$option->{'name'} argument.\n";
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176 | $$errors++;
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177 | }
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178 | }
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179 | elsif (!$option->{'regex'})
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180 | {
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181 | &set_var($option, 1);
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182 | }
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183 | else
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184 | {
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185 | print STDERR "No value given for -$option->{'name'}.\n";
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186 | $$errors++;
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187 | }
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188 | }
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189 |
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190 | sub set_var
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191 | {
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192 | my ($option, $value) = @_;
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193 | my $type = ref($option->{'varref'});
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194 |
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195 | if ($type eq 'SCALAR')
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196 | {
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197 | ${$option->{'varref'}} = $value;
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198 | }
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199 | elsif ($type eq 'ARRAY')
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200 | {
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201 | push(@{$option->{'varref'}}, $value);
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202 | }
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203 | $option->{'set'} = 1;
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204 | }
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205 |
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206 | 1;
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