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annotate src/layout/ViewConfig.ts @ 143:5adf79d4a9f4

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release v0.11.0
author drewp@bigasterisk.com
date Mon, 08 May 2023 13:29:48 -0700
parents cf642d395be4
children
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1 import Immutable from "immutable"; // mostly using this for the builtin equals() testing, since NamedNode(x)!=NamedNode(x)
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2 import { DataFactory, NamedNode, Quad_Predicate, Term } from "n3";
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3 import { MultiStore } from "../MultiStore";
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4 import { EX, RDF } from "./namespaces";
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5 import { uriValue } from "./rdf_value";
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6 import { Quad_Graph } from "rdf-js";
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7 const Uri = DataFactory.namedNode;
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8
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9 function firstElem<E>(seq: Iterable<E>): E {
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10 for (let e of seq) {
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11 return e;
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12 }
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13 throw new Error("no elems");
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14 }
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16 export interface Link {
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17 // If you display a subject u1 with a `pred` edge to u2, then treat u2 as an alias of u1.
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18 pred: NamedNode;
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19 }
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20
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21 interface TableDesc {
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22 uri: NamedNode;
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23 primary: NamedNode;
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24 joins: NamedNode[];
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25 links: Link[];
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26 }
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28 // High-level guide to how to draw the page, independent of the graph data.
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29 // Layout.ts turns this plus the actual graph data into a structure that's
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30 // close to the final render.
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31 export class ViewConfig {
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32 viewRoot: NamedNode; // this structure...
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33 graph: MultiStore; // in this graph...
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34 tables: TableDesc[] = []; // populates all the rest of these fields for use by Layout
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35 hidePredFrees: Immutable.Set<Quad_Predicate> = Immutable.Set();
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36 hideGraphEverywhere: Immutable.Set<Quad_Graph> = Immutable.Set();
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38 constructor(graph: MultiStore, viewUri: NamedNode) {
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39 this.graph = graph;
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40 this.viewRoot = viewUri;
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41 // todo
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42 // const here = "https://bigasterisk.com/lanscape/";
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43 // if (this.viewRoot.value.startsWith(here)) {
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44 // this.viewRoot = new NamedNode(this.viewRoot.value.slice(here.length));
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45 // }
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46 this.read();
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47 }
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49 private read() {
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50 for (let table of this.graph.getObjects(this.viewRoot, EX("table"), null)) {
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51 const t = this.readTable(table);
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52 this.tables.push(t);
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53 }
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54 this.tables.sort();
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55
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56 this.readHides();
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57 }
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59 private readHides() {
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60 for (let instr of this.graph.getObjects(this.viewRoot, EX("hide"), null)) {
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61 const types = this.graph.getObjects(instr, RDF("type"), null);
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62 if (types.length == 1 && types[0].equals(EX("HideEverywhere"))) {
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63 for (let g of this.graph.getObjects(instr, EX("graph"), null)) {
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64 this.hideGraphEverywhere = this.hideGraphEverywhere.add(
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65 g as Quad_Graph
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66 );
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67 }
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68 } else if (types.length == 1 && types[0].equals(EX("HideFreeStatements"))) {
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69 for (let pred of this.graph.getObjects(instr, EX("predicate"), null)) {
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70 this.hidePredFrees = this.hidePredFrees.add(pred as Quad_Predicate);
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71 }
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72 } else {
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73 throw new Error(":hide instruction must have 1 valid type");
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74 }
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75 }
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76 }
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78 private readTable(table: Term): TableDesc {
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79 const tableType = uriValue(this.graph, table, EX("primaryType"));
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80 const joins: NamedNode[] = [];
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81 for (let joinType of this.graph.getObjects(table, EX("joinType"), null)) {
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82 joins.push(joinType as NamedNode);
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83 }
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84 joins.sort();
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86 const links: Link[] = [];
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87 for (let linkDesc of this.graph.getObjects(table, EX("link"), null)) {
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88 links.push({
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89 pred: uriValue(this.graph, linkDesc, EX("predicate")),
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90 });
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91 }
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93 return {
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94 uri: table as NamedNode,
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95 primary: tableType,
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96 joins: joins,
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97 links: links,
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98 };
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99 }
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100 }