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annotate src/tabulate.ts @ 88:ac7ad087d474

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graph view rewrites and fixes for the multi-subject table
author drewp@bigasterisk.com
date Tue, 30 Nov 2021 00:14:37 -0800
parents
children a5f53d397526
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88
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1 // Organize graph data into tables (column orders, etc) for the view layer.
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2
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3 import Immutable from "immutable"; // mostly using this for the builtin equals() testing, since NamedNode(x)!=NamedNode(x)
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4 import {
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5 DataFactory,
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6 NamedNode,
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7 Quad,
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8 Quad_Object,
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9 Store,
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10 Term,
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11 Util,
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12 } from "n3";
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13
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14 const { namedNode } = DataFactory;
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15
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16 // // import ns from 'n3/src/IRIs';
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17 // // const { rdf } = ns;
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18 export const rdf = {
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19 type: namedNode("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
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20 };
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21
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22 type UriSet = Immutable.Set<NamedNode>;
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23 export type TypeToSubjs = Immutable.Map<NamedNode, UriSet>;
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24
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25 // https://github.com/rdfjs/N3.js/issues/265
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26 if ((NamedNode.prototype as any).hashCode === undefined) {
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27 (NamedNode.prototype as any).hashCode = () => 0;
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28 }
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29
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30 function getType(graph: Store, subj: NamedNode): NamedNode | null {
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31 let subjType: NamedNode | null = null;
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32
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33 graph.forObjects(
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34 (o: Quad_Object) => {
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35 subjType = o as NamedNode;
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36 },
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37 subj,
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38 rdf.type,
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39 null
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40 );
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41 return subjType;
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42 }
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43
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44 // When there are multiple types, an arbitrary one is used.
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45 export function groupByRdfType(
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46 graph: Store
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47 ): { byType: TypeToSubjs; typedSubjs: NamedNode[]; untypedSubjs: NamedNode[] } {
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48 let byType: TypeToSubjs = Immutable.Map();
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49 let untyped: UriSet = Immutable.Set(); // subjs
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50 const internSubjs = new Map<string, NamedNode>();
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51 graph.forEach(
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52 (q) => {
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53 if (!Util.isNamedNode(q.subject)) {
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54 throw new Error("unsupported " + q.subject.value);
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55 }
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56 const subj = q.subject as NamedNode;
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57
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58 const subjType = getType(graph, subj);
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59
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60 if (subjType !== null) {
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61 // (subj, rdf:type, subjType) in graph
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62 const oldKeys = Array.from(byType.keys());
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63 const oldVal = byType.get(subjType, Immutable.Set<NamedNode>());
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64 const newVal = oldVal.add(subj);
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65 byType = byType.set(subjType, newVal);
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66 } else {
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67 untyped = untyped.add(subj);
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68 }
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69 },
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70 null,
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71 null,
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72 null,
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73 null
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74 );
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75
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76 const typedSubjs = Array.from(byType.keys());
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77 typedSubjs.sort();
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78
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79 const untypedSubjs = Array.from(untyped.values());
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80 untypedSubjs.sort();
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81 return { byType: byType, typedSubjs: typedSubjs, untypedSubjs: untypedSubjs };
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82 }
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83
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84 export function predsForSubj(graph: Store, typeUri: NamedNode): NamedNode[] {
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85 const predsSet: Set<NamedNode> = new Set();
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86 graph.forEach(
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87 (q: Quad) => {
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88 predsSet.add(q.predicate as NamedNode);
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89 },
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90 typeUri,
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91 null,
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92 null,
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93 null
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94 );
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95 const preds = Array.from(predsSet.values());
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96 preds.sort();
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97 return preds;
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98 }
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99
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100 interface ISP {
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101 subj: NamedNode;
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102 pred: NamedNode;
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103 }
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104 const SP = Immutable.Record<ISP>({
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105 subj: new NamedNode(""),
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106 pred: new NamedNode(""),
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107 });
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108
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109 export class MultiSubjsTypeBlockLayout {
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110 subjs: NamedNode[];
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111 preds: NamedNode[];
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112 graphCells: Immutable.Map<ISP, Immutable.Set<Term>>;
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113 constructor(graph: Store, byType: TypeToSubjs, typeUri: NamedNode) {
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114 const subjSet = byType.get(typeUri);
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115 this.subjs = subjSet ? Array.from(subjSet) : [];
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116 this.subjs.sort();
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117
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118 let preds = Immutable.Set<NamedNode>();
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119
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120 this.graphCells = Immutable.Map<ISP, Immutable.Set<Term>>().withMutations(
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121 (mutGraphCells) => {
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122 this.subjs.forEach((subj: NamedNode) => {
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123 graph.forEach(
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124 (q: Quad) => {
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125 if (!Util.isNamedNode(q.predicate)) {
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126 throw new Error();
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127 }
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128
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129 const pred = q.predicate as NamedNode;
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130 if (pred.equals(rdf.type)) {
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131 // the whole block is labeled with the type
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132 return;
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133 }
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134 preds = preds.add(pred);
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135 const cellKey = this.makeCellKey(subj, pred);
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136 mutGraphCells.set(
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137 cellKey,
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138 mutGraphCells.get(cellKey, Immutable.Set<Term>()).add(q.object)
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139 );
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140 },
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141 subj,
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142 null,
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143 null,
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144 null
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145 );
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146 });
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147 }
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148 );
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149 this.preds = Array.from(preds);
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150 this.preds.splice(this.preds.indexOf(rdf.type), 1);
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151 // also pull out label, which should be used on 1st column
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152 this.preds.sort();
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153 }
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154
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155 makeCellKey(subj: NamedNode, pred: NamedNode): ISP {
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156 return SP({
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157 subj: subj,
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158 pred: pred,
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159 });
ac7ad087d474 graph view rewrites and fixes for the multi-subject table
drewp@bigasterisk.com
parents:
diff changeset
160 }
ac7ad087d474 graph view rewrites and fixes for the multi-subject table
drewp@bigasterisk.com
parents:
diff changeset
161 }