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annotate trunk/src/cmd/ImportGraph.d @ 699:4c0ea78a7f8b

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Fixed cycle detection algorithm.
author Aziz K?ksal <aziz.koeksal@gmail.com>
date Sat, 26 Jan 2008 20:59:27 +0100
parents 1564e41f454e
children e10838e0b182
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1059295c2727 - Every command module has an execute method now.
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1 /++
1059295c2727 - Every command module has an execute method now.
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2 Author: Aziz Köksal
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3 License: GPL3
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4 +/
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5 module cmd.ImportGraph;
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fa6d3c52757d Moved SyntaxTree.d to new package 'ast'.
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7 import dil.ast.Node;
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05c375fb2d5c Moved dil.Declarations to dil.ast.Declarations.
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8 import dil.ast.Declarations;
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9 import dil.semantic.Module;
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10 import dil.parser.ImportParser;
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11 import dil.File;
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12 import dil.Settings;
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13 import tango.text.Regex : RegExp = Regex;
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14 import tango.io.FilePath;
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15 import tango.io.FileConst;
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16 import tango.text.Util;
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17 import common;
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18
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19 alias FileConst.PathSeparatorChar dirSep;
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20
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21 enum IGraphOption
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22 {
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23 None,
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24 IncludeUnlocatableModules = 1,
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25 PrintDot = 1<<1,
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26 HighlightCyclicEdges = 1<<2,
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27 HighlightCyclicVertices = 1<<3,
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28 GroupByPackageNames = 1<<4,
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29 GroupByFullPackageName = 1<<5,
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30 PrintPaths = 1<<6,
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31 PrintList = 1<<7,
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32 MarkCyclicModules = 1<<8,
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33 }
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34
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35 string findModulePath(string moduleFQNPath, string[] importPaths)
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36 {
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37 auto filePath = new FilePath();
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38 foreach (importPath; importPaths)
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39 {
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40 filePath.set(importPath);
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41 filePath.append(moduleFQNPath);
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42 foreach (moduleSuffix; [".d", ".di"/*interface file*/])
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43 {
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44 filePath.suffix(moduleSuffix);
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45 if (filePath.exists())
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46 return filePath.toString();
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47 }
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48 }
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49 return null;
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50 }
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51
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52 class Graph
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53 {
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54 Vertex[] vertices;
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55 Edge[] edges;
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56
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57 void addVertex(Vertex vertex)
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58 {
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59 vertex.id = vertices.length;
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60 vertices ~= vertex;
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61 }
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62
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63 void addEdge(Vertex from, Vertex to)
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64 {
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65 edges ~= new Edge(from, to);
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66 from.outgoing ~= to;
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67 to.incoming ~= from;
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68 }
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69
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70 /// Walks the graph and marks cyclic vertices and edges.
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71 void detectCycles()
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72 { // Cycles could also be detected in the GraphBuilder,
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73 // but having the code here makes things much clearer.
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74 bool visit(Vertex vertex)
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75 {
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76 if (vertex.status == Vertex.Status.Visiting)
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77 {
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78 vertex.isCyclic = true;
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79 return true;
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80 }
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81 if (vertex.status == Vertex.Status.Visited)
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82 return false;
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83 // Flag as visiting.
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84 vertex.status = Vertex.Status.Visiting;
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85 // Visit successors.
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86 foreach (outVertex; vertex.outgoing)
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87 vertex.isCyclic |= visit(outVertex);
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88 // Flag as visited.
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89 vertex.status = Vertex.Status.Visited;
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90 return false;
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91 }
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92 // Start visiting vertices.
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93 visit(vertices[0]);
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94
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95 foreach (edge; edges)
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96 if (edge.from.isCyclic && edge.to.isCyclic)
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97 edge.isCyclic = true;
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98 }
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99 }
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100
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101 /// Represents a directed connection between two vertices.
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102 class Edge
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103 {
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104 Vertex from; /// Coming from vertex.
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105 Vertex to; /// Going to vertex.
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106 bool isCyclic;
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107
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108 this(Vertex from, Vertex to)
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109 {
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110 this.from = from;
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111 this.to = to;
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112 }
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113 }
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114
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115 /// Represents a module in the graph.
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116 class Vertex
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117 {
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118 Module modul; /// The module represented by this vertex.
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119 uint id; /// The nth vertex in the graph.
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120 Vertex[] incoming; /// Also called predecessors.
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121 Vertex[] outgoing; /// Also called successors.
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122 bool isCyclic; /// Whether this vertex is in a cyclic relationship with other vertices.
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123
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124 enum Status : ubyte
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125 { None, Visiting, Visited }
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126 Status status; /// Used by the cycle detection algorithm.
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127 }
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128
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129 class GraphBuilder
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130 {
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131 Graph graph;
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132 IGraphOption options;
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133 string[] importPaths; /// Where to look for modules.
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134 Vertex[string] loadedModulesTable; /// Maps FQN paths to modules.
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135 bool delegate(string) filterPredicate;
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136
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137 this()
375
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138 {
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139 this.graph = new Graph;
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140 }
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141
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142 /// Start building the graph and return that.
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143 Graph start(string fileName)
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144 {
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145 loadModule(fileName);
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146 return graph;
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147 }
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148
698
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149 /++
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150 Loads all modules recursively and builds the graph at the same time.
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151 Params:
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152 moduleFQNPath = e.g.: dil/ast/Node (module FQN = dil.ast.Node)
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153 +/
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154 Vertex loadModule(string moduleFQNPath)
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155 {
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156 // Filter out modules.
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157 if (filterPredicate(moduleFQNPath))
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158 return null;
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159
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160 // Look up in table if the module is already loaded.
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161 auto pVertex = moduleFQNPath in loadedModulesTable;
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162 if (pVertex !is null)
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163 return *pVertex; // Return already loaded module.
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164
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165 // Locate the module in the file system.
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166 auto moduleFilePath = findModulePath(moduleFQNPath, importPaths);
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167
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168 Vertex vertex;
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169
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170 if (moduleFilePath is null)
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171 { // Module not found.
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172 if (options & IGraphOption.IncludeUnlocatableModules)
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173 { // Include module nevertheless.
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174 vertex = new Vertex;
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175 vertex.modul = new Module("");
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176 vertex.modul.setFQN(replace(moduleFQNPath, dirSep, '.'));
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177 graph.addVertex(vertex);
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178 loadedModulesTable[moduleFQNPath] = vertex;
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179 }
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180 }
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181 else
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182 {
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183 auto modul = new Module(moduleFilePath);
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184 // Use lightweight ImportParser.
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185 modul.parser = new ImportParser(loadFile(moduleFilePath), moduleFilePath);
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186 modul.parse();
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187
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188 vertex = new Vertex;
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189 vertex.modul = modul;
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190
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191 graph.addVertex(vertex);
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192 loadedModulesTable[modul.getFQNPath()] = vertex;
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193 // Load modules which this module depends on.
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194 foreach (moduleFQNPath_; modul.getImportPaths())
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195 {
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196 auto loaded = loadModule(moduleFQNPath_);
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197 if (loaded !is null)
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198 graph.addEdge(vertex, loaded);
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199 }
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200 }
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201 return vertex;
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202 }
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203 }
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204
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205 void execute(string filePathString, string[] importPaths, string[] strRegexps, uint levels, IGraphOption options)
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206 {
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207 // Init regular expressions.
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208 RegExp[] regexps;
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209 foreach (strRegexp; strRegexps)
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210 regexps ~= new RegExp(strRegexp);
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211
367
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212 // Add directory of file and global directories to import paths.
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213 auto filePath = new FilePath(filePathString);
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214 auto fileDir = filePath.folder();
370
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215 if (fileDir.length)
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216 importPaths ~= fileDir;
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217 importPaths ~= GlobalSettings.importPaths;
367
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218
364
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219
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220 auto gbuilder = new GraphBuilder;
367
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221
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222 gbuilder.importPaths = importPaths;
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223 gbuilder.options = options;
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224 gbuilder.filterPredicate = (string moduleFQNPath) {
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225 foreach (rx; regexps)
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226 // Replace slashes: dil/ast/Node -> dil.ast.Node
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227 if (rx.test(replace(moduleFQNPath, dirSep, '.')))
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228 return true;
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229 return false;
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230 };
364
1059295c2727 - Every command module has an execute method now.
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231
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232 auto graph = gbuilder.start(filePath.name());
375
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233
427
e2bbc6406a14 Added a new option '-m' to the igraph command.
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diff changeset
234 if (options & (IGraphOption.PrintList | IGraphOption.PrintPaths))
e2bbc6406a14 Added a new option '-m' to the igraph command.
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235 {
e2bbc6406a14 Added a new option '-m' to the igraph command.
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diff changeset
236 if (options & IGraphOption.MarkCyclicModules)
698
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237 graph.detectCycles();
427
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238
e2bbc6406a14 Added a new option '-m' to the igraph command.
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diff changeset
239 if (options & IGraphOption.PrintPaths)
698
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240 printModulePaths(graph.vertices, levels+1, "");
427
e2bbc6406a14 Added a new option '-m' to the igraph command.
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diff changeset
241 else
698
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242 printModuleList(graph.vertices, levels+1, "");
427
e2bbc6406a14 Added a new option '-m' to the igraph command.
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diff changeset
243 }
698
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244 else
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245 printDotDocument(graph, options);
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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246 }
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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247
698
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248 void printModulePaths(Vertex[] vertices, uint level, char[] indent)
375
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249 {
698
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250 if (level == 0)
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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251 return;
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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252 foreach (vertex; vertices)
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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253 {
698
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254 Stdout(indent)((vertex.isCyclic?"*":"")~vertex.modul.filePath).newline;
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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diff changeset
255 if (vertex.outgoing.length)
698
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256 printModulePaths(vertex.outgoing, level-1, indent~" ");
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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257 }
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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diff changeset
258 }
370
ae4afb66768f - Renamed findModule() to findModulePath().
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259
698
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260 void printModuleList(Vertex[] vertices, uint level, char[] indent)
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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parents: 370
diff changeset
261 {
698
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262 if (level == 0)
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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diff changeset
263 return;
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
aziz
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diff changeset
264 foreach (vertex; vertices)
370
ae4afb66768f - Renamed findModule() to findModulePath().
aziz
parents: 368
diff changeset
265 {
698
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diff changeset
266 Stdout(indent)((vertex.isCyclic?"*":"")~vertex.modul.getFQN()).newline;
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
aziz
parents: 370
diff changeset
267 if (vertex.outgoing.length)
698
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diff changeset
268 printModuleList(vertex.outgoing, level-1, indent~" ");
370
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diff changeset
269 }
375
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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diff changeset
270 }
0bd21b746a04 - Added code to main() for recognizing options to the importgraph command.
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parents: 370
diff changeset
271
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272 void printDotDocument(Graph graph, IGraphOption options)
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273 {
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274 Vertex[][string] verticesByPckgName;
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275 if (options & IGraphOption.GroupByFullPackageName)
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276 foreach (vertex; graph.vertices)
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277 verticesByPckgName[vertex.modul.packageName] ~= vertex;
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278
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279 if (options & (IGraphOption.HighlightCyclicVertices |
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280 IGraphOption.HighlightCyclicEdges))
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281 graph.detectCycles();
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282
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283 // Output header of the dot document.
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284 Stdout("Digraph ImportGraph\n{\n");
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285 // Output nodes.
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286 // 'i' and vertex.id should be the same.
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287 foreach (i, vertex; graph.vertices)
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288 Stdout.formatln(` n{} [label="{}"{}];`, i, vertex.modul.getFQN(), (vertex.isCyclic ? ",style=filled,fillcolor=tomato" : ""));
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289 // Output edges.
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290 foreach (edge; graph.edges)
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291 Stdout.formatln(` n{} -> n{}{};`, edge.from.id, edge.to.id, (edge.isCyclic ? "[color=red]" : ""));
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292
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293 if (options & IGraphOption.GroupByFullPackageName)
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294 foreach (packageName, vertices; verticesByPckgName)
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295 { // Output nodes in a cluster.
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296 Stdout.format(` subgraph "cluster_{}" {`\n` label="{}";color=blue;`"\n ", packageName, packageName);
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297 foreach (vertex; vertices)
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298 Stdout.format(`n{};`, vertex.id);
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299 Stdout("\n }\n");
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300 }
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301
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302 Stdout("}\n");
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303 }
370
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304
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305 /+
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306 // This is the old algorithm that was used to detect cycles in a directed graph.
431
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307 void analyzeGraph(Vertex[] vertices_init, Edge[] edges)
370
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308 {
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309 void recursive(Vertex[] vertices)
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310 {
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311 foreach (idx, vertex; vertices)
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312 {
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313 uint outgoing, incoming;
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314 foreach (j, edge; edges)
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315 {
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316 if (edge.from is vertex)
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317 outgoing++;
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318 if (edge.to is vertex)
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319 incoming++;
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320 }
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321
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322 if (outgoing == 0)
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323 {
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324 if (incoming != 0)
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325 {
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326 // Vertex is a sink.
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327 alias outgoing i; // Reuse
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328 alias incoming j; // Reuse
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329 // Remove edges.
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330 for (i=j=0; i < edges.length; i++)
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331 if (edges[i].to !is vertex)
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332 edges[j++] = edges[i];
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333 edges.length = j;
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334 vertices = vertices[0..idx] ~ vertices[idx+1..$];
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335 recursive(vertices);
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336 return;
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337 }
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338 else
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339 {
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340 // Edges to this vertex were removed previously.
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341 // Only remove vertex now.
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342 vertices = vertices[0..idx] ~ vertices[idx+1..$];
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343 recursive(vertices);
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344 return;
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345 }
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346 }
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347 else if (incoming == 0)
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348 {
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349 // Vertex is a source
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350 alias outgoing i; // Reuse
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351 alias incoming j; // Reuse
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352 // Remove edges.
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353 for (i=j=0; i < edges.length; i++)
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354 if (edges[i].from !is vertex)
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355 edges[j++] = edges[i];
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356 edges.length = j;
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357 vertices = vertices[0..idx] ~ vertices[idx+1..$];
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358 recursive(vertices);
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359 return;
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360 }
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361 // else
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362 // {
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363 // // source && sink
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364 // // continue loop.
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365 // }
370
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366 }
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367
375
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368 // When reaching this point it means only cylic edges and vertices are left.
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369 foreach (vertex; vertices)
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370 vertex.isCyclic = true;
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371 foreach (edge; edges)
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372 if (edge)
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373 edge.isCyclic = true;
370
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374 }
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375 recursive(vertices_init);
370
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376 }
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377 +/