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Makes bindings parsing work really in streaming
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| import {Transform} from "readable-stream"; | ||
| import {JsonEvent} from "json-event-parser"; | ||
|
|
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| export type JsonValue = string | number | boolean | null | JsonValue[] | {[key: string]: JsonValue}; | ||
|
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| export type QueryDefinition = { | ||
| id: string; | ||
| path: (string | null)[], | ||
| returnContent: boolean | ||
| } | ||
|
|
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| export type QueryResult = { | ||
| query: string; | ||
| value?: JsonValue | ||
| } | ||
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| /** | ||
| * Emits all JSON blobs matching one of the given query. | ||
| * A query is a path composed of object keys or `null` for array keys. | ||
| */ | ||
| export class JsonStreamQueryTransformer extends Transform { | ||
| private readonly queries: QueryDefinition[]; | ||
| private keyStack: (string | number)[] = []; | ||
| private valueStack: JsonValue[] = []; | ||
| private currentQuery?: QueryDefinition = undefined; | ||
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| constructor(queries: QueryDefinition[]) { | ||
| super({writableObjectMode: true, readableObjectMode: true}); | ||
| this.queries = queries; | ||
| } | ||
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| _transform(event: JsonEvent, encoding: BufferEncoding, callback: (error?: (Error | null), data?: any) => void): void { | ||
| this.currentQuery === undefined ? this.onOtherEvent(event) : this.onKeptEvent(event); | ||
| callback(); | ||
| } | ||
|
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| private onOtherEvent(event: JsonEvent): void { | ||
| switch (event.type) { | ||
| case "open-object": | ||
| if(event.key !== undefined) { | ||
| this.keyStack.push(event.key); | ||
| } | ||
| this.currentQuery = this.findCurrentQuery(); | ||
| if(this.currentQuery) { | ||
| if(this.currentQuery.returnContent) { | ||
| this.valueStack.push({}); | ||
| } else { | ||
| this.push({ | ||
| query: this.currentQuery.id, | ||
| }) | ||
| this.currentQuery = undefined; | ||
| } | ||
| } | ||
| return; | ||
| case "open-array": | ||
| if(event.key !== undefined) { | ||
| this.keyStack.push(event.key); | ||
| } | ||
| this.currentQuery = this.findCurrentQuery(); | ||
| if(this.currentQuery) { | ||
| if(this.currentQuery.returnContent) { | ||
| this.valueStack.push([]); | ||
| } else { | ||
| this.push({ | ||
| query: this.currentQuery.id | ||
| }) | ||
| this.currentQuery = undefined; | ||
| } | ||
| } | ||
| return; | ||
| case "value": | ||
| if(event.key !== undefined) { | ||
| this.keyStack.push(event.key); | ||
| } | ||
| this.currentQuery = this.findCurrentQuery(); | ||
| if(this.currentQuery) { | ||
| this.push({ | ||
| query: this.currentQuery.id, | ||
| value: event.value | ||
| }) | ||
| this.currentQuery = undefined; | ||
| } | ||
| case "close-object": | ||
| case "close-array": | ||
| this.keyStack.pop(); | ||
| } | ||
| } | ||
|
|
||
| private findCurrentQuery(): QueryDefinition | undefined { | ||
| for(const query of this.queries) { | ||
| if(query.path.length === this.keyStack.length && query.path.every((value, i) => value === null ? typeof this.keyStack[i] === 'number' : value === this.keyStack[i])) { | ||
| return query; | ||
| } | ||
| } | ||
| return undefined; | ||
| } | ||
|
|
||
| private onKeptEvent(event: JsonEvent): void { | ||
| let value: any; | ||
| switch (event.type) { | ||
| case "open-object": | ||
| value = {}; | ||
| this.insertInPreviousValue(event.key, value); | ||
| this.valueStack.push(value); | ||
| return; | ||
| case "open-array": | ||
| value = []; | ||
| this.insertInPreviousValue(event.key, value); | ||
| this.valueStack.push(value); | ||
| return; | ||
| case "value": | ||
| this.insertInPreviousValue(event.key, event.value); | ||
| return; | ||
| case "close-object": | ||
| case "close-array": | ||
| value = this.valueStack.pop(); | ||
| if(this.valueStack.length === 0) { | ||
| // End | ||
| this.push({ | ||
| query: this.currentQuery.id, | ||
| value | ||
| }) | ||
| this.currentQuery = undefined; | ||
| this.keyStack.pop(); | ||
| } | ||
| } | ||
| } | ||
|
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| private insertInPreviousValue(key: number | string | undefined, value: JsonValue): void { | ||
| const previousValue = this.valueStack[this.valueStack.length - 1]; | ||
| if(typeof key === "number") { | ||
| (<JsonValue[]>previousValue).push(value); | ||
| } else if(typeof key === "string") { | ||
| (<any>previousValue)[key] = value; | ||
| } | ||
| } | ||
| } |
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