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annotate src/layout/Layout.ts @ 106:2468f2227d22

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make src/layout/ and src/render/ separation
author drewp@bigasterisk.com
date Sun, 13 Mar 2022 22:00:30 -0700
parents src/Layout.ts@1aea03d306af
children 5e6840229a05
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 } from "./namespaces";
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6 import { TableDesc, ViewConfig } from "./ViewConfig";
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7
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8 type UriSet = Immutable.Set<NamedNode>;
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9 export type TypeToSubjs = Immutable.Map<NamedNode, UriSet>;
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10
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11 // https://github.com/rdfjs/N3.js/issues/265
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12 (NamedNode.prototype as any).hashCode = () => 0;
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13
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14 interface ColumnHeader {
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15 rdfType: NamedNode;
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16 pred: NamedNode;
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17 }
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18 export interface AlignedTable {
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19 columnHeaders: ColumnHeader[];
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20 rows: (Term | null)[][]; // each row is 1 wider than columnHeaders since the 1st element is the subject for that row
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21 }
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22 interface FreeStatements {
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23 statements: Quad[];
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24 }
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25 export interface LayoutResult {
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26 sections: (AlignedTable | FreeStatements)[];
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27 }
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28
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29 class AlignedTableBuilder {
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30 columnPreds = Immutable.List<NamedNode>();
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31 subjRowIndices = Immutable.Map<NamedNode, number>();
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32 rows: (Term | null)[][] = [];
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33 constructor(
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34 public rdfType: NamedNode /* plus join types, sort instructions */
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35 ) {}
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36
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37 addQuad(q: Quad) {
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38 const pred = q.predicate as NamedNode;
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39 const omittedColumn = pred.equals(rdf.type);
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40 if (!this.columnPreds.contains(pred) && !omittedColumn) {
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41 this.columnPreds = this.columnPreds.push(pred); // this is putting cols in random order
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42 this.rows.forEach((r) => r.push(null));
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43 }
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44
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45 const predIndex = omittedColumn ? null : this.columnPreds.indexOf(pred);
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46 let rowIndex = this.subjRowIndices.get(q.subject as NamedNode);
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47 if (rowIndex === undefined) {
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48 const newRow = new Array(1 + this.columnPreds.size).fill(null);
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49 newRow[0] = q.subject;
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50 this.rows.push(newRow);
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51 rowIndex = this.rows.length - 1;
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52 this.subjRowIndices = this.subjRowIndices.set(
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53 q.subject as NamedNode,
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54 rowIndex
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55 );
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56 }
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57 if (predIndex !== null) {
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58 this.rows[rowIndex][1 + predIndex] = q.object;
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59 }
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60 }
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61
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62 value(): AlignedTable {
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63 this.rows.sort((a, b) => {
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64 const uriA = (a[0] as NamedNode).value,
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65 uriB = (b[0] as NamedNode).value;
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66 return uriA.localeCompare(uriB);
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67 });
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68 const headers = this.columnPreds
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69 .map((pred) => {
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70 return { rdfType: this.rdfType, pred: pred };
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71 })
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72 .toArray();
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73 return { columnHeaders: headers, rows: this.rows };
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74 }
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75 }
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76
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77 function findTypesNeededForTables(viewConfig?: ViewConfig): UriSet {
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78 const typesToGather: NamedNode[] = [];
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79 if (viewConfig) {
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80 viewConfig.tables.forEach((t: TableDesc) => {
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81 typesToGather.push(t.primary);
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82 });
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83 }
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84 return Immutable.Set(typesToGather);
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85 }
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86
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87 function findSubjectsWithTypes(graph: Store, typesToGatherSet: UriSet): UriSet {
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88 const subjectsToGather: NamedNode[] = [];
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89 graph.forEach(
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90 (q: Quad) => {
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91 if (typesToGatherSet.contains(q.object as NamedNode)) {
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92 subjectsToGather.push(q.subject as NamedNode);
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93 }
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94 },
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95 null,
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96 rdf.type,
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97 null,
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98 null
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99 );
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100 return Immutable.Set(subjectsToGather);
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101 }
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102
103
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103 export class Layout {
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104 constructor(public viewConfig?: ViewConfig) {}
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105 plan(graph: Store): LayoutResult {
104
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106 const typesToGatherSet = findTypesNeededForTables(this.viewConfig);
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107
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108 const subjectsToGatherSet = findSubjectsWithTypes(graph, typesToGatherSet);
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109 const ungrouped: Quad[] = [];
104
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110 const vc = this.viewConfig;
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111 const table =
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112 vc && vc.tables.length > 0
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113 ? new AlignedTableBuilder(vc.tables[0].primary)
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114 : null;
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115
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116 graph.forEach(
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117 (q: Quad) => {
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118 if (!subjectsToGatherSet.contains(q.subject as NamedNode) || !table) {
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119 ungrouped.push(q);
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120 } else {
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121 table.addQuad(q);
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122 }
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123 },
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124 null,
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125 null,
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126 null,
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127 null
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128 );
104
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129 const res: LayoutResult = { sections: [] };
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130 if (table) {
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131 res.sections.push(table.value());
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132 }
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133 res.sections.push({ statements: ungrouped });
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134 return res;
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135 }
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136 }
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137
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138 // interface ISP {
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139 // subj: NamedNode;
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140 // pred: NamedNode;
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141 // }
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142 // const SP = Immutable.Record<ISP>({
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143 // subj: new NamedNode(""),
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144 // pred: new NamedNode(""),
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145 // });
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146
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147 // // One table of rows with a common rdf:type.
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148 // export class MultiSubjsTypeBlockLayout {
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149 // subjs: NamedNode[];
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150 // preds: NamedNode[];
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151 // graphCells: Immutable.Map<ISP, Immutable.Set<Term>>;
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152 // constructor(graph: Store, byType: TypeToSubjs, table: TableDesc) {
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153 // const subjSet = byType.get(table.primary);
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154 // this.subjs = subjSet ? Array.from(subjSet) : [];
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155 // this.subjs.sort();
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156
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157 // let preds = Immutable.Set<NamedNode>();
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158
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159 // this.graphCells = Immutable.Map<ISP, Immutable.Set<Term>>().withMutations(
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160 // (mutGraphCells) => {
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161 // this.subjs.forEach((subj: NamedNode) => {
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162 // graph.forEach(
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163 // (q: Quad) => {
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164 // if (!Util.isNamedNode(q.predicate)) {
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165 // throw new Error();
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166 // }
88
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167
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168 // const pred = q.predicate as NamedNode;
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169 // if (pred.equals(rdf.type)) {
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170 // // the whole block is labeled with the type
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171 // return;
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172 // }
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173 // preds = preds.add(pred);
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174 // const cellKey = this.makeCellKey(subj, pred);
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175 // mutGraphCells.set(
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176 // cellKey,
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177 // mutGraphCells.get(cellKey, Immutable.Set<Term>()).add(q.object)
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178 // );
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179 // },
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180 // subj,
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181 // null,
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182 // null,
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183 // null
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184 // );
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185 // });
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186 // }
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187 // );
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188 // this.preds = Array.from(preds);
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189 // this.preds.splice(this.preds.indexOf(rdf.type), 1);
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190 // // also pull out label, which should be used on 1st column
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191 // this.preds.sort();
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192 // }
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193
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194 // makeCellKey(subj: NamedNode, pred: NamedNode): ISP {
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195 // return SP({
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196 // subj: subj,
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197 // pred: pred,
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198 // });
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199 // }
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200 // }