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| author | deepakjadmin |
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| date | Thu, 15 Dec 2016 14:18:03 -0500 |
| parents | 73ae111cf86f |
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<html> <head> <title>MayaChemTools:Code:Graph::Path.pm</title> <meta http-equiv="content-type" content="text/html;charset=utf-8"> <link rel="stylesheet" type="text/css" href="../../../css/MayaChemToolsCode.css"> </head> <body leftmargin="20" rightmargin="20" topmargin="10" bottommargin="10"> <br/> <center> <a href="http://www.mayachemtools.org" title="MayaChemTools Home"><img src="../../../images/MayaChemToolsLogo.gif" border="0" alt="MayaChemTools"></a> </center> <br/> <pre> <a name="package-Graph::Path-"></a> 1 <span class="k">package </span><span class="i">Graph::Path</span><span class="sc">;</span> 2 <span class="c">#</span> 3 <span class="c"># $RCSfile: Path.pm,v $</span> 4 <span class="c"># $Date: 2015/02/28 20:49:06 $</span> 5 <span class="c"># $Revision: 1.25 $</span> 6 <span class="c">#</span> 7 <span class="c"># Author: Manish Sud <msud@san.rr.com></span> 8 <span class="c">#</span> 9 <span class="c"># Copyright (C) 2015 Manish Sud. All rights reserved.</span> 10 <span class="c">#</span> 11 <span class="c"># This file is part of MayaChemTools.</span> 12 <span class="c">#</span> 13 <span class="c"># MayaChemTools is free software; you can redistribute it and/or modify it under</span> 14 <span class="c"># the terms of the GNU Lesser General Public License as published by the Free</span> 15 <span class="c"># Software Foundation; either version 3 of the License, or (at your option) any</span> 16 <span class="c"># later version.</span> 17 <span class="c">#</span> 18 <span class="c"># MayaChemTools is distributed in the hope that it will be useful, but without</span> 19 <span class="c"># any warranty; without even the implied warranty of merchantability of fitness</span> 20 <span class="c"># for a particular purpose. See the GNU Lesser General Public License for more</span> 21 <span class="c"># details.</span> 22 <span class="c">#</span> 23 <span class="c"># You should have received a copy of the GNU Lesser General Public License</span> 24 <span class="c"># along with MayaChemTools; if not, see <http://www.gnu.org/licenses/> or</span> 25 <span class="c"># write to the Free Software Foundation Inc., 59 Temple Place, Suite 330,</span> 26 <span class="c"># Boston, MA, 02111-1307, USA.</span> 27 <span class="c">#</span> 28 29 <span class="k">use</span> <span class="w">strict</span><span class="sc">;</span> 30 <span class="k">use</span> <span class="w">Carp</span><span class="sc">;</span> 31 <span class="k">use</span> <span class="w">Exporter</span><span class="sc">;</span> 32 <span class="k">use</span> <span class="w">Storable</span> <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 33 <span class="k">use</span> <span class="w">Scalar::Util</span> <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 34 35 <span class="k">use</span> <span class="w">vars</span> <span class="q">qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS)</span><span class="sc">;</span> 36 37 <span class="i">@ISA</span> = <span class="q">qw(Exporter)</span><span class="sc">;</span> 38 <span class="i">@EXPORT</span> = <span class="q">qw()</span><span class="sc">;</span> 39 <span class="i">@EXPORT_OK</span> = <span class="q">qw()</span><span class="sc">;</span> 40 41 <span class="i">%EXPORT_TAGS</span> = <span class="s">(</span><span class="w">all</span> <span class="cm">=></span> <span class="s">[</span><span class="i">@EXPORT</span><span class="cm">,</span> <span class="i">@EXPORT_OK</span><span class="s">]</span><span class="s">)</span><span class="sc">;</span> 42 43 <span class="c"># Setup class variables...</span> 44 <span class="k">my</span><span class="s">(</span><span class="i">$ClassName</span><span class="cm">,</span> <span class="i">$ObjectID</span><span class="s">)</span><span class="sc">;</span> 45 <span class="i">_InitializeClass</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 46 47 <span class="c"># Overload Perl functions...</span> 48 <span class="k">use</span> <span class="w">overload</span> <span class="q">'""'</span> <span class="cm">=></span> <span class="q">'StringifyPath'</span><span class="cm">,</span> 49 50 <span class="q">'=='</span> <span class="cm">=></span> <span class="q">'_PathEqualOperator'</span><span class="cm">,</span> 51 <span class="q">'eq'</span> <span class="cm">=></span> <span class="q">'_PathEqualOperator'</span><span class="cm">,</span> 52 53 <span class="q">'fallback'</span> <span class="cm">=></span> <span class="k">undef</span><span class="sc">;</span> 54 55 <span class="c"># Class constructor...</span> <a name="new-"></a> 56 <span class="k">sub </span><span class="m">new</span> <span class="s">{</span> 57 <span class="k">my</span><span class="s">(</span><span class="i">$Class</span><span class="cm">,</span> <span class="i">@VertexIDs</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 58 59 <span class="c"># Initialize object...</span> 60 <span class="k">my</span> <span class="i">$This</span> = <span class="s">{</span><span class="s">}</span><span class="sc">;</span> 61 <span class="k">bless</span> <span class="i">$This</span><span class="cm">,</span> <span class="k">ref</span><span class="s">(</span><span class="i">$Class</span><span class="s">)</span> || <span class="i">$Class</span><span class="sc">;</span> 62 <span class="i">$This</span><span class="i">->_InitializePath</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 63 64 <span class="k">if</span> <span class="s">(</span><span class="i">@VertexIDs</span><span class="s">)</span> <span class="s">{</span> <span class="i">$This</span><span class="i">->AddVertices</span><span class="s">(</span><span class="i">@VertexIDs</span><span class="s">)</span><span class="sc">;</span> <span class="s">}</span> 65 66 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 67 <span class="s">}</span> 68 69 <span class="c"># Initialize object data...</span> 70 <span class="c">#</span> <a name="_InitializePath-"></a> 71 <span class="k">sub </span><span class="m">_InitializePath</span> <span class="s">{</span> 72 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 73 74 <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}} = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 75 <span class="s">}</span> 76 77 <span class="c"># Initialize class ...</span> <a name="_InitializeClass-"></a> 78 <span class="k">sub </span><span class="m">_InitializeClass</span> <span class="s">{</span> 79 <span class="c">#Class name...</span> 80 <span class="i">$ClassName</span> = <span class="w">__PACKAGE__</span><span class="sc">;</span> 81 <span class="s">}</span> 82 83 <span class="c"># Add a vertex to path after the end vertex...</span> 84 <span class="c">#</span> <a name="AddVertex-"></a> 85 <span class="k">sub </span><span class="m">AddVertex</span> <span class="s">{</span> 86 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$VertexID</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 87 88 <span class="k">if</span> <span class="s">(</span>!<span class="k">defined</span> <span class="i">$VertexID</span> <span class="s">)</span> <span class="s">{</span> 89 <span class="w">carp</span> <span class="q">"Warning: ${ClassName}->AddVertex: No vertex added: Vertex ID must be specified..."</span><span class="sc">;</span> 90 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 91 <span class="s">}</span> 92 <span class="k">push</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="i">$VertexID</span><span class="sc">;</span> 93 94 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 95 <span class="s">}</span> 96 97 <span class="c"># Add vertices to the path after the end vertex...</span> 98 <span class="c">#</span> <a name="AddVertices-"></a> 99 <span class="k">sub </span><span class="m">AddVertices</span> <span class="s">{</span> 100 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">@VertexIDs</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 101 102 <span class="k">if</span> <span class="s">(</span>!<span class="i">@VertexIDs</span><span class="s">)</span> <span class="s">{</span> 103 <span class="w">carp</span> <span class="q">"Warning: ${ClassName}->AddVertices: No vertices added: Vertices list is empty..."</span><span class="sc">;</span> 104 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 105 <span class="s">}</span> 106 <span class="k">push</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="i">@VertexIDs</span><span class="sc">;</span> 107 108 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 109 <span class="s">}</span> 110 111 <span class="c"># Add a vertex to path after the end vertex...</span> 112 <span class="c">#</span> <a name="PushVertex-"></a> 113 <span class="k">sub </span><span class="m">PushVertex</span> <span class="s">{</span> 114 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$VertexID</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 115 116 <span class="k">return</span> <span class="i">$This</span><span class="i">->AddVertex</span><span class="s">(</span><span class="i">$VertexID</span><span class="s">)</span><span class="sc">;</span> 117 <span class="s">}</span> 118 119 <span class="c"># Add vertices to the path after the end vertex...</span> 120 <span class="c">#</span> <a name="PushVertices-"></a> 121 <span class="k">sub </span><span class="m">PushVertices</span> <span class="s">{</span> 122 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">@VertexIDs</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 123 124 <span class="k">return</span> <span class="i">$This</span><span class="i">->AddVertices</span><span class="s">(</span><span class="i">@VertexIDs</span><span class="s">)</span><span class="sc">;</span> 125 <span class="s">}</span> 126 127 <span class="c"># Remove end vertex from path...</span> 128 <span class="c">#</span> <a name="PopVertex-"></a> 129 <span class="k">sub </span><span class="m">PopVertex</span> <span class="s">{</span> 130 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 131 132 <span class="k">if</span> <span class="s">(</span>!<span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="s">)</span> <span class="s">{</span> 133 <span class="w">carp</span> <span class="q">"Warning: ${ClassName}->PopVertex: No vertex removed: Path is empty..."</span><span class="sc">;</span> 134 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 135 <span class="s">}</span> 136 <span class="k">pop</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 137 138 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 139 <span class="s">}</span> 140 141 <span class="c"># Remove start vertex from path...</span> 142 <span class="c">#</span> <a name="ShiftVertex-"></a> 143 <span class="k">sub </span><span class="m">ShiftVertex</span> <span class="s">{</span> 144 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 145 146 <span class="k">if</span> <span class="s">(</span>!<span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="s">)</span> <span class="s">{</span> 147 <span class="w">carp</span> <span class="q">"Warning: ${ClassName}->ShiftVertex: No vertex removed: Path is empty..."</span><span class="sc">;</span> 148 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 149 <span class="s">}</span> 150 <span class="k">shift</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 151 152 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 153 <span class="s">}</span> 154 155 <span class="c"># Add a vertex to path before the start vertex...</span> 156 <span class="c">#</span> <a name="UnshiftVertex-"></a> 157 <span class="k">sub </span><span class="m">UnshiftVertex</span> <span class="s">{</span> 158 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$VertexID</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 159 160 <span class="k">if</span> <span class="s">(</span>!<span class="k">defined</span> <span class="i">$VertexID</span> <span class="s">)</span> <span class="s">{</span> 161 <span class="w">carp</span> <span class="q">"Warning: ${ClassName}->UnshiftVertex: No vertex added: Vertex ID must be specified..."</span><span class="sc">;</span> 162 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 163 <span class="s">}</span> 164 <span class="k">unshift</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="i">$VertexID</span><span class="sc">;</span> 165 166 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 167 <span class="s">}</span> 168 169 <span class="c"># Add vertices to the path before the start vertex...</span> 170 <span class="c">#</span> <a name="UnshiftVertices-"></a> 171 <span class="k">sub </span><span class="m">UnshiftVertices</span> <span class="s">{</span> 172 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">@VertexIDs</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 173 174 <span class="k">if</span> <span class="s">(</span>!<span class="i">@VertexIDs</span><span class="s">)</span> <span class="s">{</span> 175 <span class="w">carp</span> <span class="q">"Warning: ${ClassName}->UnshiftVertices: No vertices added: Vertices list is empty..."</span><span class="sc">;</span> 176 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 177 <span class="s">}</span> 178 <span class="k">unshift</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="i">@VertexIDs</span><span class="sc">;</span> 179 180 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 181 <span class="s">}</span> 182 183 <span class="c"># Get length...</span> 184 <span class="c">#</span> <a name="GetLength-"></a> 185 <span class="k">sub </span><span class="m">GetLength</span> <span class="s">{</span> 186 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 187 188 <span class="k">return</span> <span class="k">scalar</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 189 <span class="s">}</span> 190 191 <span class="c"># Get start vertex...</span> 192 <span class="c">#</span> <a name="GetStartVertex-"></a> 193 <span class="k">sub </span><span class="m">GetStartVertex</span> <span class="s">{</span> 194 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 195 196 <span class="k">if</span> <span class="s">(</span>!<span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 197 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 198 <span class="s">}</span> 199 <span class="k">my</span><span class="s">(</span><span class="i">$Index</span><span class="s">)</span> = <span class="n">0</span><span class="sc">;</span> 200 <span class="k">return</span> <span class="i">$This</span><span class="i">->_GetVertex</span><span class="s">(</span><span class="i">$Index</span><span class="s">)</span><span class="sc">;</span> 201 <span class="s">}</span> 202 203 <span class="c"># Get end vertex...</span> 204 <span class="c">#</span> <a name="GetEndVertex-"></a> 205 <span class="k">sub </span><span class="m">GetEndVertex</span> <span class="s">{</span> 206 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 207 208 <span class="k">if</span> <span class="s">(</span>!<span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 209 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 210 <span class="s">}</span> 211 <span class="k">my</span><span class="s">(</span><span class="i">$Index</span><span class="s">)</span><span class="sc">;</span> 212 213 <span class="i">$Index</span> = <span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span> - <span class="n">1</span><span class="sc">;</span> 214 <span class="k">return</span> <span class="i">$This</span><span class="i">->_GetVertex</span><span class="s">(</span><span class="i">$Index</span><span class="s">)</span><span class="sc">;</span> 215 <span class="s">}</span> 216 217 <span class="c"># Get start and end vertices...</span> 218 <span class="c">#</span> <a name="GetTerminalVertices-"></a> 219 <span class="k">sub </span><span class="m">GetTerminalVertices</span> <span class="s">{</span> 220 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 221 222 <span class="k">return</span> <span class="s">(</span> <span class="i">$This</span><span class="i">->GetStartVertex</span><span class="s">(</span><span class="s">)</span><span class="cm">,</span> <span class="i">$This</span><span class="i">->GetEndVertex</span><span class="s">(</span><span class="s">)</span> <span class="s">)</span><span class="cm">,</span> 223 <span class="s">}</span> 224 225 <span class="c"># Get path vertices...</span> 226 <span class="c">#</span> <a name="GetVertices-"></a> 227 <span class="k">sub </span><span class="m">GetVertices</span> <span class="s">{</span> 228 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 229 230 <span class="k">return</span> <span class="k">wantarray</span> ? <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}} <span class="co">:</span> <span class="k">scalar</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 231 <span class="s">}</span> 232 233 <span class="c"># Get a specific vertex from path with indicies starting from 0...</span> 234 <span class="c">#</span> <a name="GetVertex-"></a> 235 <span class="k">sub </span><span class="m">GetVertex</span> <span class="s">{</span> 236 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$Index</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 237 238 <span class="k">if</span> <span class="s">(</span><span class="i">$Index</span> < <span class="n">0</span><span class="s">)</span> <span class="s">{</span> 239 <span class="w">croak</span> <span class="q">"Error: ${ClassName}->GetValue: Index value must be a positive number..."</span><span class="sc">;</span> 240 <span class="s">}</span> 241 <span class="k">if</span> <span class="s">(</span><span class="i">$Index</span> >= <span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 242 <span class="w">croak</span> <span class="q">"Error: ${ClassName}->GetValue: Index vaue must be less than length of path..."</span><span class="sc">;</span> 243 <span class="s">}</span> 244 <span class="k">if</span> <span class="s">(</span>!<span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 245 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 246 <span class="s">}</span> 247 <span class="k">return</span> <span class="i">$This</span><span class="i">->_GetVertex</span><span class="s">(</span><span class="i">$Index</span><span class="s">)</span><span class="sc">;</span> 248 <span class="s">}</span> 249 250 <span class="c"># Get a vertex...</span> 251 <span class="c">#</span> <a name="_GetVertex-"></a> 252 <span class="k">sub </span><span class="m">_GetVertex</span> <span class="s">{</span> 253 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$Index</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 254 255 <span class="k">return</span> <span class="i">$This</span>->{<span class="w">Vertices</span>}[<span class="i">$Index</span>]<span class="sc">;</span> 256 <span class="s">}</span> 257 258 <span class="c"># Get path edges as pair of vertices or number of edges...</span> 259 <span class="c">#</span> <a name="GetEdges-"></a> 260 <span class="k">sub </span><span class="m">GetEdges</span> <span class="s">{</span> 261 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 262 263 <span class="k">if</span> <span class="s">(</span><span class="i">$This</span><span class="i">->GetLength</span> < <span class="n">1</span><span class="s">)</span> <span class="s">{</span> 264 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 265 <span class="s">}</span> 266 <span class="c"># Set up edges...</span> 267 <span class="k">my</span><span class="s">(</span><span class="i">$Index</span><span class="cm">,</span> <span class="i">$VertexID1</span><span class="cm">,</span> <span class="i">$VertexID2</span><span class="cm">,</span> <span class="i">@Vertices</span><span class="cm">,</span> <span class="i">@Edges</span><span class="s">)</span><span class="sc">;</span> 268 269 <span class="i">@Edges</span> = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 270 <span class="k">for</span> <span class="i">$Index</span> <span class="s">(</span><span class="n">0</span> .. <span class="s">(</span><span class="i">$#</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}} - <span class="n">1</span><span class="s">)</span> <span class="s">)</span> <span class="s">{</span> 271 <span class="i">$VertexID1</span> = <span class="i">$This</span>->{<span class="w">Vertices</span>}[<span class="i">$Index</span>]<span class="sc">;</span> 272 <span class="i">$VertexID2</span> = <span class="i">$This</span>->{<span class="w">Vertices</span>}[<span class="i">$Index</span> + <span class="n">1</span>]<span class="sc">;</span> 273 <span class="k">push</span> <span class="i">@Edges</span><span class="cm">,</span> <span class="s">(</span><span class="i">$VertexID1</span><span class="cm">,</span> <span class="i">$VertexID2</span><span class="s">)</span><span class="sc">;</span> 274 <span class="s">}</span> 275 276 <span class="k">return</span> <span class="k">wantarray</span> ? <span class="i">@Edges</span> <span class="co">:</span> <span class="s">(</span><span class="s">(</span><span class="k">scalar</span> <span class="i">@Edges</span><span class="s">)</span>/<span class="n">2</span><span class="s">)</span><span class="sc">;</span> 277 <span class="s">}</span> 278 279 <span class="c"># Is it a cycle?</span> 280 <span class="c">#</span> <a name="IsCycle-"></a> 281 <span class="k">sub </span><span class="m">IsCycle</span> <span class="s">{</span> 282 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 283 <span class="k">my</span><span class="s">(</span><span class="i">$StartVertex</span><span class="cm">,</span> <span class="i">$EndVertex</span><span class="s">)</span><span class="sc">;</span> 284 285 <span class="s">(</span><span class="i">$StartVertex</span><span class="cm">,</span> <span class="i">$EndVertex</span><span class="s">)</span> = <span class="i">$This</span><span class="i">->GetTerminalVertices</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 286 287 <span class="k">return</span> <span class="s">(</span><span class="i">$StartVertex</span> == <span class="i">$EndVertex</span><span class="s">)</span> ? <span class="n">1</span> <span class="co">:</span> <span class="n">0</span><span class="sc">;</span> 288 <span class="s">}</span> 289 290 <span class="c"># For a path to be an independent path, it must meet the following conditions:</span> 291 <span class="c"># . All other vertices are unique.</span> 292 <span class="c">#</span> <a name="IsIndependentPath-"></a> 293 <span class="k">sub </span><span class="m">IsIndependentPath</span> <span class="s">{</span> 294 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 295 296 <span class="c"># Make sure it has at least two vertices...</span> 297 <span class="k">if</span> <span class="s">(</span><span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span> < <span class="n">2</span><span class="s">)</span> <span class="s">{</span> 298 <span class="k">return</span> <span class="n">0</span><span class="sc">;</span> 299 <span class="s">}</span> 300 301 <span class="c"># Check frequency of occurence for non-terminal vertices...</span> 302 <span class="k">my</span><span class="s">(</span><span class="i">$VertexID</span><span class="cm">,</span> <span class="i">$IndependenceStatus</span><span class="cm">,</span> <span class="i">@Vertices</span><span class="cm">,</span> <span class="i">%VerticesMap</span><span class="s">)</span><span class="sc">;</span> 303 304 <span class="i">@Vertices</span> = <span class="i">$This</span><span class="i">->GetVertices</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 305 <span class="k">shift</span> <span class="i">@Vertices</span><span class="sc">;</span> <span class="k">pop</span> <span class="i">@Vertices</span><span class="sc">;</span> 306 307 <span class="i">%VerticesMap</span> = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 308 <span class="i">$IndependenceStatus</span> = <span class="n">1</span><span class="sc">;</span> 309 310 <span class="j">VERTEXID:</span> <span class="k">for</span> <span class="i">$VertexID</span> <span class="s">(</span><span class="i">@Vertices</span><span class="s">)</span> <span class="s">{</span> 311 <span class="k">if</span> <span class="s">(</span><span class="k">exists</span> <span class="i">$VerticesMap</span>{<span class="i">$VertexID</span>} <span class="s">)</span> <span class="s">{</span> 312 <span class="i">$IndependenceStatus</span> = <span class="n">0</span><span class="sc">;</span> 313 <span class="k">last</span> <span class="j">VERTEXID</span><span class="sc">;</span> 314 <span class="s">}</span> 315 <span class="i">$VerticesMap</span>{<span class="i">$VertexID</span>} = <span class="i">$VertexID</span><span class="sc">;</span> 316 <span class="s">}</span> 317 <span class="k">return</span> <span class="i">$IndependenceStatus</span><span class="sc">;</span> 318 <span class="s">}</span> 319 320 <span class="c"># For a path to be an independent cyclic path, it must meet the following conditions:</span> 321 <span class="c"># . Termimal vertices are the same</span> 322 <span class="c"># . All other vertices are unique.</span> 323 <span class="c">#</span> <a name="IsIndependentCyclicPath-"></a> 324 <span class="k">sub </span><span class="m">IsIndependentCyclicPath</span> <span class="s">{</span> 325 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 326 327 <span class="c"># Make sure it's a cycle...</span> 328 <span class="k">if</span> <span class="s">(</span>!<span class="s">(</span><span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span> >= <span class="n">3</span> && <span class="i">$This</span><span class="i">->IsCycle</span><span class="s">(</span><span class="s">)</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 329 <span class="k">return</span> <span class="n">0</span><span class="sc">;</span> 330 <span class="s">}</span> 331 <span class="k">return</span> <span class="i">$This</span><span class="i">->IsIndependentPath</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 332 <span class="s">}</span> 333 334 <span class="c"># Is it a path object?</span> <a name="IsPath-"></a> 335 <span class="k">sub </span><span class="m">IsPath ($)</span> <span class="s">{</span> 336 <span class="k">my</span><span class="s">(</span><span class="i">$Object</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 337 338 <span class="k">return</span> <span class="i">_IsPath</span><span class="s">(</span><span class="i">$Object</span><span class="s">)</span><span class="sc">;</span> 339 <span class="s">}</span> 340 341 <span class="c"># Copy path...</span> 342 <span class="c">#</span> <a name="Copy-"></a> 343 <span class="k">sub </span><span class="m">Copy</span> <span class="s">{</span> 344 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 345 <span class="k">my</span><span class="s">(</span><span class="i">$NewPath</span><span class="s">)</span><span class="sc">;</span> 346 347 <span class="i">$NewPath</span> = <span class="i">Storable::dclone</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span><span class="sc">;</span> 348 349 <span class="k">return</span> <span class="i">$NewPath</span><span class="sc">;</span> 350 <span class="s">}</span> 351 352 <span class="c"># Reverse order of vertices in path...</span> 353 <span class="c">#</span> <a name="Reverse-"></a> 354 <span class="k">sub </span><span class="m">Reverse</span> <span class="s">{</span> 355 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 356 <span class="k">my</span><span class="s">(</span><span class="i">@VertexIDs</span><span class="s">)</span><span class="sc">;</span> 357 358 <span class="i">@VertexIDs</span> = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> <span class="k">push</span> <span class="i">@VertexIDs</span><span class="cm">,</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 359 360 <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}} = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> <span class="k">push</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="k">reverse</span> <span class="i">@VertexIDs</span><span class="sc">;</span> 361 362 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span> 363 <span class="s">}</span> 364 365 <span class="c"># Get vertices common between two paths...</span> 366 <span class="c">#</span> <a name="GetCommonVertices-"></a> 367 <span class="k">sub </span><span class="m">GetCommonVertices</span> <span class="s">{</span> 368 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$Other</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 369 <span class="k">my</span><span class="s">(</span><span class="i">$VertexID</span><span class="cm">,</span> <span class="i">@CommonVertices</span><span class="cm">,</span> <span class="i">%OtherVerticesMap</span><span class="s">)</span><span class="sc">;</span> 370 371 <span class="c"># Setup a vertices hash for a quick look up...</span> 372 <span class="i">%OtherVerticesMap</span> = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 373 <span class="k">for</span> <span class="i">$VertexID</span> <span class="s">(</span><span class="i">$Other</span><span class="i">->GetVertices</span><span class="s">(</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 374 <span class="i">$OtherVerticesMap</span>{<span class="i">$VertexID</span>} = <span class="i">$VertexID</span><span class="sc">;</span> 375 <span class="s">}</span> 376 377 <span class="i">@CommonVertices</span> = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 378 <span class="k">for</span> <span class="i">$VertexID</span> <span class="s">(</span><span class="i">$This</span><span class="i">->GetVertices</span><span class="s">(</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 379 <span class="k">if</span> <span class="s">(</span><span class="i">$OtherVerticesMap</span>{<span class="i">$VertexID</span>}<span class="s">)</span> <span class="s">{</span> 380 <span class="k">push</span> <span class="i">@CommonVertices</span><span class="cm">,</span> <span class="i">$VertexID</span> 381 <span class="s">}</span> 382 <span class="s">}</span> 383 <span class="k">return</span> <span class="k">wantarray</span> ? <span class="i">@CommonVertices</span> <span class="co">:</span> <span class="k">scalar</span> <span class="i">@CommonVertices</span><span class="sc">;</span> 384 <span class="s">}</span> 385 386 <span class="c"># Join the existing path with a new path specifed using a path object of a list of</span> 387 <span class="c"># verticies.</span> 388 <span class="c">#</span> <a name="Join-"></a> 389 <span class="k">sub </span><span class="m">Join</span> <span class="s">{</span> 390 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">@Values</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 391 392 <span class="k">return</span> <span class="i">$This</span><span class="i">->_Join</span><span class="s">(</span><span class="i">@Values</span><span class="s">)</span><span class="sc">;</span> 393 <span class="s">}</span> 394 395 <span class="c"># Join the existing path with a new path specifed using a path object at a specified</span> 396 <span class="c"># vertex.</span> 397 <span class="c">#</span> <a name="JoinAtVertex-"></a> 398 <span class="k">sub </span><span class="m">JoinAtVertex</span> <span class="s">{</span> 399 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$Other</span><span class="cm">,</span> <span class="i">$CenterVertexID</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 400 401 <span class="c"># Make sure CenterVertexID is end vertex in This and start vertex in Other before</span> 402 <span class="c"># joining them...</span> 403 <span class="k">if</span> <span class="s">(</span><span class="i">$This</span><span class="i">->GetEndVertex</span><span class="s">(</span><span class="s">)</span> != <span class="i">$CenterVertexID</span><span class="s">)</span> <span class="s">{</span> 404 <span class="i">$This</span><span class="i">->Reverse</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 405 <span class="s">}</span> 406 <span class="k">if</span> <span class="s">(</span><span class="i">$Other</span><span class="i">->GetStartVertex</span><span class="s">(</span><span class="s">)</span> != <span class="i">$CenterVertexID</span><span class="s">)</span> <span class="s">{</span> 407 <span class="i">$Other</span><span class="i">->Reverse</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 408 <span class="s">}</span> 409 <span class="k">return</span> <span class="i">$This</span><span class="i">->_Join</span><span class="s">(</span><span class="i">$Other</span><span class="s">)</span><span class="sc">;</span> 410 <span class="s">}</span> 411 412 <span class="c"># Join the existing path with a new path specifed using a path object of a list of</span> 413 <span class="c"># verticies.</span> 414 <span class="c">#</span> 415 <span class="c"># Notes:</span> 416 <span class="c"># . Paths must have a common terminal vertex.</span> 417 <span class="c"># . Based on the common terminal vertex found, new path vertices are added to the</span> 418 <span class="c"># current path in one of the four ways:</span> 419 <span class="c"># . New path at end of current path with same vertices order : EndVertex = NewStartVertex</span> 420 <span class="c"># . New path at end of current path with reversed vertices order: EndVertex = NewEndVertex</span> 421 <span class="c"># . New path at front of current path with same vertices order: StartVertex = NewEndVertex</span> 422 <span class="c"># . New path at front of current path with reversed vertices order: StartVertex = NewStartVertex</span> 423 <span class="c">#</span> <a name="_Join-"></a> 424 <span class="k">sub </span><span class="m">_Join</span> <span class="s">{</span> 425 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">@Values</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 426 427 <span class="k">if</span> <span class="s">(</span>!<span class="i">@Values</span><span class="s">)</span> <span class="s">{</span> 428 <span class="k">return</span><span class="sc">;</span> 429 <span class="s">}</span> 430 431 <span class="c"># Get a list of new vertex IDs..</span> 432 <span class="k">my</span><span class="s">(</span><span class="i">$NewPath</span><span class="cm">,</span> <span class="i">$FirstValue</span><span class="cm">,</span> <span class="i">$TypeOfFirstValue</span><span class="cm">,</span> <span class="i">@NewVertexIDs</span><span class="s">)</span><span class="sc">;</span> 433 434 <span class="i">$NewPath</span> = <span class="i">$This</span><span class="i">->Copy</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 435 436 <span class="i">@NewVertexIDs</span> = <span class="s">(</span><span class="s">)</span><span class="sc">;</span> 437 <span class="i">$FirstValue</span> = <span class="i">$Values</span>[<span class="n">0</span>]<span class="sc">;</span> 438 <span class="i">$TypeOfFirstValue</span> = <span class="k">ref</span> <span class="i">$FirstValue</span><span class="sc">;</span> 439 <span class="k">if</span> <span class="s">(</span><span class="i">$TypeOfFirstValue</span> =~ <span class="q">/^(SCALAR|HASH|CODE|REF|GLOB)/</span><span class="s">)</span> <span class="s">{</span> 440 <span class="w">croak</span> <span class="q">"Error: ${ClassName}->JoinPath: Trying to add vertices to path object with a reference to unsupported value format..."</span><span class="sc">;</span> 441 <span class="s">}</span> 442 443 <span class="k">if</span> <span class="s">(</span><span class="i">_IsPath</span><span class="s">(</span><span class="i">$FirstValue</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 444 <span class="c"># It's another path object...</span> 445 <span class="k">push</span> <span class="i">@NewVertexIDs</span><span class="cm">,</span> <span class="i">@</span>{<span class="i">$FirstValue</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 446 <span class="s">}</span> 447 <span class="k">elsif</span> <span class="s">(</span><span class="i">$TypeOfFirstValue</span> =~ <span class="q">/^ARRAY/</span><span class="s">)</span> <span class="s">{</span> 448 <span class="c"># It's array reference...</span> 449 <span class="k">push</span> <span class="i">@NewVertexIDs</span><span class="cm">,</span> <span class="i">@</span>{<span class="i">$FirstValue</span>}<span class="sc">;</span> 450 <span class="s">}</span> 451 <span class="k">else</span> <span class="s">{</span> 452 <span class="c"># It's a list of values...</span> 453 <span class="k">push</span> <span class="i">@NewVertexIDs</span><span class="cm">,</span> <span class="i">@Values</span><span class="sc">;</span> 454 <span class="s">}</span> 455 <span class="k">my</span><span class="s">(</span><span class="i">$StartVertex</span><span class="cm">,</span> <span class="i">$EndVertex</span><span class="cm">,</span> <span class="i">$NewStartVertex</span><span class="cm">,</span> <span class="i">$NewEndVertex</span><span class="s">)</span><span class="sc">;</span> 456 457 <span class="s">(</span><span class="i">$StartVertex</span><span class="cm">,</span> <span class="i">$EndVertex</span><span class="s">)</span> = <span class="i">$NewPath</span><span class="i">->GetTerminalVertices</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span> 458 <span class="s">(</span><span class="i">$NewStartVertex</span><span class="cm">,</span> <span class="i">$NewEndVertex</span><span class="s">)</span> = <span class="s">(</span><span class="i">$NewVertexIDs</span>[<span class="n">0</span>]<span class="cm">,</span> <span class="i">$NewVertexIDs</span>[<span class="i">$#NewVertexIDs</span>]<span class="s">)</span><span class="sc">;</span> 459 460 <span class="k">if</span> <span class="s">(</span>!<span class="s">(</span><span class="i">$EndVertex</span> == <span class="i">$NewStartVertex</span> || <span class="i">$EndVertex</span> == <span class="i">$NewEndVertex</span> || <span class="i">$StartVertex</span> == <span class="i">$NewEndVertex</span> || <span class="i">$StartVertex</span> == <span class="i">$NewStartVertex</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 461 <span class="w">carp</span> <span class="q">"Warning: ${ClassName}->JoinPath: Paths can't be joined: No common terminal vertex found..."</span><span class="sc">;</span> 462 <span class="k">return</span> <span class="k">undef</span><span class="sc">;</span> 463 <span class="s">}</span> 464 465 <span class="k">if</span> <span class="s">(</span><span class="i">$EndVertex</span> == <span class="i">$NewStartVertex</span><span class="s">)</span> <span class="s">{</span> 466 <span class="c"># Take out EndVertex and add new path at the end...</span> 467 <span class="k">pop</span> <span class="i">@</span>{<span class="i">$NewPath</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 468 <span class="k">push</span> <span class="i">@</span>{<span class="i">$NewPath</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="i">@NewVertexIDs</span><span class="sc">;</span> 469 <span class="s">}</span> 470 <span class="k">elsif</span> <span class="s">(</span><span class="i">$EndVertex</span> == <span class="i">$NewEndVertex</span><span class="s">)</span> <span class="s">{</span> 471 <span class="c"># Take out EndVertex and add new path at the end with reversed vertex order...</span> 472 <span class="k">pop</span> <span class="i">@</span>{<span class="i">$NewPath</span>->{<span class="w">Vertices</span>}}<span class="sc">;</span> 473 <span class="k">push</span> <span class="i">@</span>{<span class="i">$NewPath</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="k">reverse</span> <span class="i">@NewVertexIDs</span><span class="sc">;</span> 474 <span class="s">}</span> 475 <span class="k">elsif</span> <span class="s">(</span><span class="i">$StartVertex</span> == <span class="i">$NewEndVertex</span><span class="s">)</span> <span class="s">{</span> 476 <span class="c"># Take out NewEndVertex and add new path at the front...</span> 477 <span class="k">pop</span> <span class="i">@NewVertexIDs</span><span class="sc">;</span> 478 <span class="k">unshift</span> <span class="i">@</span>{<span class="i">$NewPath</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="i">@NewVertexIDs</span><span class="sc">;</span> 479 <span class="s">}</span> 480 <span class="k">elsif</span> <span class="s">(</span><span class="i">$StartVertex</span> == <span class="i">$NewStartVertex</span><span class="s">)</span> <span class="s">{</span> 481 <span class="c"># Take out NewStartVertex and add new path at the front...</span> 482 <span class="k">shift</span> <span class="i">@NewVertexIDs</span><span class="sc">;</span> 483 <span class="k">unshift</span> <span class="i">@</span>{<span class="i">$NewPath</span>->{<span class="w">Vertices</span>}}<span class="cm">,</span> <span class="k">reverse</span> <span class="i">@NewVertexIDs</span><span class="sc">;</span> 484 <span class="s">}</span> 485 486 <span class="k">return</span> <span class="i">$NewPath</span><span class="cm">,</span> 487 <span class="s">}</span> 488 489 <span class="c"># Compare two paths...</span> 490 <span class="c">#</span> <a name="_PathEqualOperator-"></a> 491 <span class="k">sub </span><span class="m">_PathEqualOperator</span> <span class="s">{</span> 492 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$Other</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 493 494 <span class="k">if</span> <span class="s">(</span>!<span class="s">(</span><span class="k">defined</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> && <span class="i">_IsPath</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> && <span class="k">defined</span><span class="s">(</span><span class="i">$Other</span><span class="s">)</span> && <span class="i">_IsPath</span><span class="s">(</span><span class="i">$Other</span><span class="s">)</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 495 <span class="w">croak</span> <span class="q">"Error: ${ClassName}->_PathEqualOperator: Path equal comparison failed: Both object must be paths..."</span><span class="sc">;</span> 496 <span class="s">}</span> 497 498 <span class="k">if</span> <span class="s">(</span><span class="i">$This</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span> != <span class="i">$Other</span><span class="i">->GetLength</span><span class="s">(</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span> 499 <span class="k">return</span> <span class="n">0</span><span class="sc">;</span> 500 <span class="s">}</span> 501 <span class="k">my</span><span class="s">(</span><span class="i">$ThisID</span><span class="cm">,</span> <span class="i">$OtherID</span><span class="cm">,</span> <span class="i">$ReverseOtherID</span><span class="s">)</span><span class="sc">;</span> 502 503 <span class="i">$ThisID</span> = <span class="k">join</span><span class="s">(</span><span class="q">'-'</span><span class="cm">,</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="s">)</span><span class="sc">;</span> 504 <span class="i">$OtherID</span> = <span class="k">join</span><span class="s">(</span><span class="q">'-'</span><span class="cm">,</span> <span class="i">@</span>{<span class="i">$Other</span>->{<span class="w">Vertices</span>}}<span class="s">)</span><span class="sc">;</span> 505 <span class="i">$ReverseOtherID</span> = <span class="k">join</span><span class="s">(</span><span class="q">'-'</span><span class="cm">,</span> <span class="k">reverse</span><span class="s">(</span><span class="i">@</span>{<span class="i">$Other</span>->{<span class="w">Vertices</span>}}<span class="s">)</span><span class="s">)</span><span class="sc">;</span> 506 507 <span class="k">return</span> <span class="s">(</span><span class="i">$ThisID</span> =~ <span class="q">/^($OtherID|$ReverseOtherID)$/</span><span class="s">)</span> ? <span class="n">1</span> <span class="co">:</span> <span class="n">0</span><span class="sc">;</span> 508 <span class="s">}</span> 509 510 <span class="c"># Return a string containing vertices in the path...</span> <a name="StringifyPath-"></a> 511 <span class="k">sub </span><span class="m">StringifyPath</span> <span class="s">{</span> 512 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 513 <span class="k">my</span><span class="s">(</span><span class="i">$PathString</span><span class="s">)</span><span class="sc">;</span> 514 515 <span class="i">$PathString</span> = <span class="q">"Path: "</span> . <span class="k">join</span><span class="s">(</span><span class="q">'-'</span><span class="cm">,</span> <span class="i">@</span>{<span class="i">$This</span>->{<span class="w">Vertices</span>}}<span class="s">)</span><span class="sc">;</span> 516 517 <span class="k">return</span> <span class="i">$PathString</span><span class="sc">;</span> 518 <span class="s">}</span> 519 520 <span class="c"># Is it a path object?</span> <a name="_IsPath-"></a> 521 <span class="k">sub </span><span class="m">_IsPath</span> <span class="s">{</span> 522 <span class="k">my</span><span class="s">(</span><span class="i">$Object</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> 523 524 <span class="k">return</span> <span class="s">(</span><span class="i">Scalar::Util::blessed</span><span class="s">(</span><span class="i">$Object</span><span class="s">)</span> && <span class="i">$Object</span><span class="i">->isa</span><span class="s">(</span><span class="i">$ClassName</span><span class="s">)</span><span class="s">)</span> ? <span class="n">1</span> <span class="co">:</span> <span class="n">0</span><span class="sc">;</span> 525 <span class="s">}</span> 526 <a name="EOF-"></a></pre> <p> </p> <br /> <center> <img src="../../../images/h2o2.png"> </center> </body> </html>