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annotate src/layout/Layout.ts @ 119:8715633f5213

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fancier column sorting to bring preds from the same type together
author drewp@bigasterisk.com
date Sun, 20 Mar 2022 01:17:35 -0700
parents c2923b20bf5c
children a7519d92dbc6
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rev   line source
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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 { NamedNode, Quad, Store, Term } from "n3";
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5 import { rdf, rdfs } from "./namespaces";
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6 import { uniqueSortedTerms, UriPairMap } from "./rdf_value";
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7 import { ViewConfig } from "./ViewConfig";
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8
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9 type UriSet = Immutable.Set<NamedNode>;
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10
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11 interface ColumnHeader {
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12 rdfTypes: NamedNode[];
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13 pred: NamedNode;
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14 }
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15
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16 export interface AlignedTable {
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17 columnHeaders: ColumnHeader[];
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18 rowHeaders: NamedNode[];
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19 rows: Term[][][];
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20 }
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21
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22 export interface PredRow {
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23 pred: NamedNode;
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24 objs: Term[];
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25 }
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26
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27 export interface SubjRow {
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28 subj: NamedNode;
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29 predRows: PredRow[];
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30 }
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31
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32 export interface FreeStatements {
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33 subjRows: SubjRow[];
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34 }
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35
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36 export interface LayoutResult {
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37 sections: (AlignedTable | FreeStatements)[];
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38 }
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39
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40 class AlignedTableBuilder {
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41 subjSet: UriSet = Immutable.Set();
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42 predSet: UriSet = Immutable.Set();
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43 subjsSeenWithPred: Immutable.Map<NamedNode, NamedNode[]> = Immutable.Map();
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44 typesSeenForSubj: Immutable.Map<NamedNode, NamedNode[]> = Immutable.Map();
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45
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46 cell = new UriPairMap();
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47 constructor(public primaryType: NamedNode, public joinTypes: NamedNode[]) {}
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48
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49 showsType(rdfType: NamedNode): boolean {
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50 return (
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51 this.primaryType.equals(rdfType) ||
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52 Immutable.Set<NamedNode>(this.joinTypes).has(rdfType)
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53 );
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54 }
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55
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56 addQuad(q: Quad) {
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57 const subj = q.subject as NamedNode;
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58 const pred = q.predicate as NamedNode;
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59 this.subjSet = this.subjSet.add(subj);
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60 this.predSet = this.predSet.add(pred);
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61 this.cell.add(subj, pred, q.object);
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62
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63 if (pred.equals(rdf.type)) {
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64 this.trackTypes(subj, q.object as NamedNode);
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65 }
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66 this.trackSubjs(subj, pred);
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67 }
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68
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69 private trackTypes(subj: NamedNode<string>, rdfType: NamedNode) {
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70 let cur = this.typesSeenForSubj.get(subj, undefined);
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71 if (cur === undefined) {
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72 cur = [];
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73 this.typesSeenForSubj = this.typesSeenForSubj.set(subj, cur);
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74 }
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75 cur.push(rdfType);
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76 }
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77
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78 private trackSubjs(subj: NamedNode, pred: NamedNode<string>) {
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79 let cur = this.subjsSeenWithPred.get(pred, undefined);
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80 if (cur === undefined) {
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81 cur = [];
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82 this.subjsSeenWithPred = this.subjsSeenWithPred.set(pred, cur);
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83 }
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84 cur.push(subj);
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85 }
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86
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87 _displayedPreds(): NamedNode[] {
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88 let preds = uniqueSortedTerms(this.predSet);
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89 preds = preds.filter((p) => {
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90 return !p.equals(rdf.type);
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91 });
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92 const tagged = preds.map((p, i) => {
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93 const types = this.typesSeenWithPred(p);
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94 return {
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95 sort: [
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96 p.equals(rdfs.label) ? 0 : 1,
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97 types.length == 1 ? 0 : 1,
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98 types[0].equals(this.primaryType) ? 0 : 1,
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99 types[0],
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100 i,
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101 ],
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102 val: p,
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103 };
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104 });
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105 tagged.sort((a, b) => {
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106 let ib = 0;
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107 for (let k1 of a.sort) {
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108 const k2 = b.sort[ib];
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109 if (!Immutable.is(k1, k2)) {
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110 if (typeof k1 === "number") {
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111 if (typeof k2 === "number") {
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112 return k1 - k2;
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113 } else {
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114 throw new Error(`${k1} vs ${k2}`);
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115 }
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116 } else {
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117 return (k1 as NamedNode).id.localeCompare((k2 as NamedNode).id);
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118 }
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119 }
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120 ib++;
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121 }
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122 return 0;
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123 });
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124 preds = tagged.map((e) => e.val);
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125 return preds;
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126 }
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127
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128 gotStatements(): boolean {
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129 return !this.subjSet.isEmpty();
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130 }
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131
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132 private typesSeenWithPred(pred: NamedNode): NamedNode[] {
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133 const subs = this.subjsSeenWithPred.get(pred, []);
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134 const types: NamedNode[] = [];
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135 subs.forEach((s) => {
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136 this.typesSeenForSubj.get(s, []).forEach((t) => {
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137 types.push(t);
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138 });
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139 });
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140 return uniqueSortedTerms(types);
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141 }
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142
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143 value(): AlignedTable {
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144 const subjs = uniqueSortedTerms(this.subjSet);
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145 const preds = this._displayedPreds();
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146 const outputGrid: Term[][][] = [];
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147 for (let subj of subjs) {
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148 const row: Term[][] = [];
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149 preds.forEach((pred) => {
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150 const objs = this.cell.get(subj, pred);
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151 const uniq = uniqueSortedTerms(objs);
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152 row.push(uniq);
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153 });
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154 outputGrid.push(row);
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155 }
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156
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157 const headers: ColumnHeader[] = preds.map((pred) => {
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158 return { rdfTypes: this.typesSeenWithPred(pred), pred: pred };
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159 });
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160 return { columnHeaders: headers, rowHeaders: subjs, rows: outputGrid };
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161 }
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162 }
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163
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164 type SubjectTableBuilders = Immutable.Map<
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165 NamedNode<string>,
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166 AlignedTableBuilder[]
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167 >;
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168
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169 function subjectsToTablesMap(
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170 graph: Store,
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171 tableBuilders: AlignedTableBuilder[]
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172 ): SubjectTableBuilders {
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173 let out: SubjectTableBuilders = Immutable.Map();
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174 graph.forEach(
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175 (q: Quad) => {
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176 const s = q.subject as NamedNode;
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177 const rdfType = q.object as NamedNode;
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178 tableBuilders.forEach((tb) => {
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179 if (tb.showsType(rdfType)) {
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180 let cur = out.get(s, undefined);
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181 if (cur === undefined) {
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182 cur = [];
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183 out = out.set(s, cur);
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184 }
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185 cur.push(tb);
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186 }
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187 });
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188 },
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189 null,
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190 rdf.type,
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191 null,
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192 null
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193 );
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194 return out;
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195 }
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196
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197 function freeStatmentsSection(stmts: Quad[]): FreeStatements {
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198 const subjs: NamedNode[] = [];
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199 stmts.forEach((q) => {
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200 subjs.push(q.subject as NamedNode);
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201 });
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202 return {
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203 subjRows: uniqueSortedTerms(subjs).map((subj) => {
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204 const preds: NamedNode[] = [];
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205 let po = Immutable.Map<NamedNode, Term[]>();
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206 stmts.forEach((q) => {
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207 if (q.subject.equals(subj)) {
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208 const p = q.predicate as NamedNode;
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209 preds.push(p);
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210 po = po.set(p, po.get(p, []));
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211 po.get(p)?.push(q.object as Term);
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212 }
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213 });
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214
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215 const rows: PredRow[] = [];
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216 uniqueSortedTerms(preds).forEach((p) => {
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217 rows.push({ pred: p, objs: uniqueSortedTerms(po.get(p, [])) });
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218 });
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219 return { subj: subj, predRows: rows };
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220 }),
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221 };
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222 }
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223
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224 // The description of how this page should look: sections, tables, etc.
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225 export class Layout {
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226 constructor(public viewConfig?: ViewConfig) {}
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227
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228 _groupAllStatements(
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229 graph: Store,
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230 tablesWantingSubject: SubjectTableBuilders,
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231 ungrouped: Quad[]
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232 ) {
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233 graph.forEach(
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234 (q: Quad) => {
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235 const tables = tablesWantingSubject.get(q.subject as NamedNode);
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236
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237 if (tables && tables.length) {
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238 tables.forEach((t: AlignedTableBuilder) => t.addQuad(q));
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239 } else {
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240 ungrouped.push(q);
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241 }
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242 },
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243 null,
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244 null,
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245 null,
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246 null
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247 );
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248 }
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249
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250 plan(graph: Store): LayoutResult {
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251 const ungrouped: Quad[] = [];
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252
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253 const tableBuilders = this.viewConfig
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254 ? this.viewConfig.tables.map(
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255 (t) => new AlignedTableBuilder(t.primary, t.joins)
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256 )
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257 : [];
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258
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259 const tablesWantingSubject = subjectsToTablesMap(graph, tableBuilders);
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260 this._groupAllStatements(graph, tablesWantingSubject, ungrouped);
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261 const res: LayoutResult = { sections: [] };
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262 for (const t of tableBuilders) {
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263 if (t.gotStatements()) {
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264 res.sections.push(t.value());
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265 }
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266 }
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267 if (ungrouped.length) {
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268 res.sections.push(freeStatmentsSection(ungrouped));
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269 }
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270 return res;
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271 }
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272 }