1 |
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2 |
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3 | var Hoek = require('hoek');
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4 |
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5 |
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6 |
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7 |
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8 | var internals = {};
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9 |
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10 |
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11 | exports = module.exports = internals.Topo = function () {
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12 |
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13 | this._items = [];
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14 | this.nodes = [];
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15 | };
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16 |
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17 |
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18 | internals.Topo.prototype.add = function (nodes, options) {
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19 |
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20 | var self = this;
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21 |
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22 | options = options || {};
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23 |
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24 |
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25 |
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26 | var before = [].concat(options.before || []);
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27 | var after = [].concat(options.after || []);
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28 | var group = options.group || '?';
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29 |
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30 | Hoek.assert(before.indexOf(group) === -1, 'Item cannot come before itself:', group);
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31 | Hoek.assert(before.indexOf('?') === -1, 'Item cannot come before unassociated items');
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32 | Hoek.assert(after.indexOf(group) === -1, 'Item cannot come after itself:', group);
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33 | Hoek.assert(after.indexOf('?') === -1, 'Item cannot come after unassociated items');
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34 |
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35 | ([].concat(nodes)).forEach(function (node, i) {
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36 |
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37 | var item = {
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38 | seq: self._items.length,
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39 | before: before,
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40 | after: after,
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41 | group: group,
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42 | node: node
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43 | };
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44 |
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45 | self._items.push(item);
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46 | });
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47 |
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48 |
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49 |
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50 | var error = this._sort();
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51 | Hoek.assert(!error, 'item', (group !== '?' ? 'added into group ' + group : ''), 'created a dependencies error');
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52 |
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53 | return this.nodes;
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54 | };
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55 |
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56 |
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57 | internals.Topo.prototype._sort = function () {
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58 |
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59 |
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60 |
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61 | var groups = {};
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62 | var graph = {};
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63 | var graphAfters = {};
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64 |
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65 | for (var i = 0, il = this._items.length; i < il; ++i) {
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66 | var item = this._items[i];
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67 | var seq = item.seq;
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68 | var group = item.group;
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69 |
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70 |
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71 |
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72 | groups[group] = groups[group] || [];
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73 | groups[group].push(seq);
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74 |
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75 |
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76 |
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77 | graph[seq] = [item.before];
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78 |
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79 |
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80 |
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81 | var after = item.after;
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82 | for (var j = 0, jl = after.length; j < jl; ++j) {
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83 | graphAfters[after[j]] = (graphAfters[after[j]] || []).concat(seq);
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84 | }
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85 | }
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86 |
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87 |
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88 |
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89 | var graphNodes = Object.keys(graph);
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90 | for (i = 0, il = graphNodes.length; i < il; ++i) {
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91 | var node = graphNodes[i];
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92 | var expandedGroups = [];
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93 |
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94 | var graphNodeItems = Object.keys(graph[node]);
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95 | for (j = 0, jl = graphNodeItems.length; j < jl; ++j) {
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96 | var group = graph[node][graphNodeItems[j]];
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97 | groups[group] = groups[group] || [];
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98 | groups[group].forEach(function (d) {
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99 |
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100 | expandedGroups.push(d);
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101 | });
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102 | }
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103 | graph[node] = expandedGroups;
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104 | }
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105 |
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106 |
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107 |
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108 | var afterNodes = Object.keys(graphAfters);
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109 | for (i = 0, il = afterNodes.length; i < il; ++i) {
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110 | var group = afterNodes[i];
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111 |
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112 | if (groups[group]) {
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113 | for (j = 0, jl = groups[group].length; j < jl; ++j) {
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114 | var node = groups[group][j];
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115 | graph[node] = graph[node].concat(graphAfters[group]);
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116 | }
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117 | }
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118 | }
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119 |
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120 |
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121 |
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122 | var ancestors = {};
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123 | graphNodes = Object.keys(graph);
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124 | for (i = 0, il = graphNodes.length; i < il; ++i) {
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125 | var node = graphNodes[i];
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126 | var children = graph[node];
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127 |
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128 | for (j = 0, jl = children.length; j < jl; ++j) {
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129 | ancestors[children[j]] = (ancestors[children[j]] || []).concat(node);
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130 | }
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131 | }
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132 |
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133 |
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134 |
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135 | var visited = {};
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136 | var sorted = [];
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137 |
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138 | for (i = 0, il = this._items.length; i < il; ++i) {
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139 | var next = i;
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140 |
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141 | if (ancestors[i]) {
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142 | next = null;
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143 | for (j = 0, jl = this._items.length; j < jl; ++j) {
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144 | if (visited[j] === true) {
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145 | continue;
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146 | }
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147 |
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148 | if (!ancestors[j]) {
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149 | ancestors[j] = [];
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150 | }
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151 |
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152 | var shouldSeeCount = ancestors[j].length;
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153 | var seenCount = 0;
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154 | for (var l = 0, ll = shouldSeeCount; l < ll; ++l) {
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155 | if (sorted.indexOf(ancestors[j][l]) >= 0) {
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156 | ++seenCount;
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157 | }
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158 | }
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159 |
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160 | if (seenCount === shouldSeeCount) {
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161 | next = j;
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162 | break;
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163 | }
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164 | }
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165 | }
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166 |
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167 | if (next !== null) {
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168 | next = next.toString();
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169 | visited[next] = true;
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170 | sorted.push(next);
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171 | }
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172 | }
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173 |
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174 | if (sorted.length !== this._items.length) {
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175 | return new Error('Invalid dependencies');
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176 | }
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177 |
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178 | var seqIndex = {};
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179 | this._items.forEach(function (item) {
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180 |
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181 | seqIndex[item.seq] = item;
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182 | });
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183 |
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184 | var sortedNodes = [];
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185 | this._items = sorted.map(function (value) {
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186 |
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187 | var item = seqIndex[value];
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188 | sortedNodes.push(item.node);
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189 | return item;
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190 | });
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191 |
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192 | this.nodes = sortedNodes;
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193 | };
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