Mercurial > code > home > repos > streamed-graph
annotate src/layout/ViewConfig.ts @ 128:5a1a79f54779
big rewrite
| author | drewp@bigasterisk.com |
|---|---|
| date | Fri, 05 May 2023 21:26:36 -0700 |
| parents | 2e8fa3fec0c8 |
| children | cf642d395be4 |
| rev | line source |
|---|---|
| 128 | 1 import Immutable from "immutable"; // mostly using this for the builtin equals() testing, since NamedNode(x)!=NamedNode(x) |
| 2 import { DataFactory, NamedNode, Quad_Predicate, Term } from "n3"; | |
| 3 import { MultiStore } from "../MultiStore"; | |
| 4 import { EX } from "./namespaces"; | |
| 5 import { uriValue } from "./rdf_value"; | |
| 94 | 6 const Uri = DataFactory.namedNode; |
| 93 | 7 |
| 94 | 8 function firstElem<E>(seq: Iterable<E>): E { |
| 9 for (let e of seq) { | |
| 10 return e; | |
| 11 } | |
| 12 throw new Error("no elems"); | |
| 13 } | |
| 14 | |
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15 export interface Link { |
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16 // If you display a subject u1 with a `pred` edge to u2, then treat u2 as an alias of u1. |
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17 pred: NamedNode; |
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18 } |
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19 |
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20 interface TableDesc { |
| 97 | 21 uri: NamedNode; |
| 22 primary: NamedNode; | |
| 23 joins: NamedNode[]; | |
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24 links: Link[]; |
| 97 | 25 } |
| 26 | |
| 128 | 27 // High-level guide to how to draw the page, independent of the graph data. |
| 28 // Layout.ts turns this plus the actual graph data into a structure that's | |
| 29 // close to the final render. | |
| 102 | 30 export class ViewConfig { |
| 128 | 31 viewRoot: NamedNode; // this structure... |
| 32 graph: MultiStore; // in this graph... | |
| 33 tables: TableDesc[] = []; // populates all the rest of these fields for use by Layout | |
| 34 freeStatementsHidePred: Immutable.Set<Quad_Predicate> = Immutable.Set(); | |
| 95 | 35 |
| 128 | 36 constructor(graph: MultiStore, viewUri: NamedNode) { |
| 37 this.graph = graph; | |
| 38 this.viewRoot = viewUri; | |
| 39 // todo | |
| 40 const here = "https://bigasterisk.com/lanscape/"; | |
| 41 if (this.viewRoot.value.startsWith(here)) { | |
| 42 this.viewRoot = new NamedNode(this.viewRoot.value.slice(here.length)); | |
| 43 } | |
| 44 // todo: might need to reread if graph changes | |
| 45 this.read(); | |
| 93 | 46 } |
| 95 | 47 |
| 128 | 48 private read() { |
| 49 for (let table of this.graph.getObjects(this.viewRoot, EX("table"), null)) { | |
| 50 const t = this.readTable(table); | |
| 51 this.tables.push(t); | |
| 102 | 52 } |
| 128 | 53 this.tables.sort(); |
| 102 | 54 |
| 128 | 55 this.readHides(); |
| 102 | 56 } |
| 57 | |
| 128 | 58 private readHides() { |
| 59 for (let hideInstruction of this.graph.getObjects( | |
| 60 this.viewRoot, | |
| 61 EX("freeStatementsHide"), | |
| 62 null | |
| 63 )) { | |
| 64 for (let pred of this.graph.getObjects( | |
| 65 hideInstruction, | |
| 66 EX("predicate"), | |
| 67 null | |
| 68 )) { | |
| 69 this.freeStatementsHidePred = this.freeStatementsHidePred.add( | |
| 70 pred as Quad_Predicate | |
| 71 ); | |
| 97 | 72 } |
| 128 | 73 } |
| 74 } | |
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75 |
| 128 | 76 private readTable(table: Term): TableDesc { |
| 77 const tableType = uriValue(this.graph, table, EX("primaryType")); | |
| 78 const joins: NamedNode[] = []; | |
| 79 for (let joinType of this.graph.getObjects(table, EX("joinType"), null)) { | |
| 80 joins.push(joinType as NamedNode); | |
| 81 } | |
| 82 joins.sort(); | |
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parents:
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83 |
| 128 | 84 const links: Link[] = []; |
| 85 for (let linkDesc of this.graph.getObjects(table, EX("link"), null)) { | |
| 86 links.push({ | |
| 87 pred: uriValue(this.graph, linkDesc, EX("predicate")), | |
| 102 | 88 }); |
| 94 | 89 } |
| 102 | 90 |
| 128 | 91 return { |
| 92 uri: table as NamedNode, | |
| 93 primary: tableType, | |
| 94 joins: joins, | |
| 95 links: links, | |
| 96 }; | |
| 93 | 97 } |
| 98 } |