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Utilities to parse grouped quads from the N3-family of serializations based on parser directives
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<span class="cline-any cline-yes">2x</span></td><td class="text"><pre class="prettyprint lang-js">import {CommentCallback, Parser, ParserOptions, PrefixCallback, Quad} from 'n3';
import { EventEmitter } from "events";
export type GroupedQuadsCallback = Function; //function (Error|undefined, Quad[][]):void;
export type GroupParserCallbacks = {
onGroupedQuads: GroupedQuadsCallback;
onComment: CommentCallback;
onPrefix: PrefixCallback;
}
export default class GroupedParser {
private _parser: Parser;
constructor(options: ParserOptions) {
this._parser = new Parser(options);
}
/**
*
*/
parse(input: string | EventEmitter, groupCallback?: GroupParserCallbacks|GroupedQuadsCallback): void{
// The second parameter accepts an object { onGrouped: ..., onPrefix: ..., onComment: ...}
// As a second and third parameter it still accepts a separate quadCallback and prefixCallback for backward compatibility as well
let onGroupedQuads: GroupedQuadsCallback, onPrefix: PrefixCallback, onComment: CommentCallback;
if (groupCallback && (
(groupCallback as GroupParserCallbacks).onGroupedQuads !== undefined ||
(groupCallback as GroupParserCallbacks).onComment !== undefined ||
(groupCallback as GroupParserCallbacks).onPrefix !== undefined )) {
onGroupedQuads = (groupCallback as GroupParserCallbacks).onGroupedQuads;
onPrefix = (groupCallback as GroupParserCallbacks).onPrefix;
onComment = (groupCallback as GroupParserCallbacks).onComment;
}
else if (groupCallback) {
onGroupedQuads = groupCallback as GroupedQuadsCallback;
onComment = () => {};
}
let groups:Map<string, Quad[]> = new Map();
this._parser.parse(input, {
onQuad: (error, quad) => {
if (error) {
onGroupedQuads(error);
}
else if (quad) {
groups.forEach(group => {
group.push(quad);
});
// If however there were no groups...
if (groups.size === 0) {
// Output a single quad group
onGroupedQuads(null,[quad]);
}
} else {
// This is the end, just output the remaining groups if they weren’t closed
groups.forEach( (group, key) => {
onGroupedQuads(null, group);
groups.delete(key);
});
onGroupedQuads(null, null);
}
},
onComment: (comment: string) => {
// Parse comment and try to find a start pragma
const foundBegin = comment.match(/\s*@group begin\s*(.*)\s*/);
// When begin is found multiple times, it is going to reset the current set of quads.
if (foundBegin && foundBegin[1] !== undefined) {
// If the group is named, then add it to the map
groups.set(foundBegin[1], []);
}
// Parse comment to find an end -- a second time the group is closed without opening it is just ignored
const foundEnd = comment.match(/\s*@group end\s*(.*)\s*/);
if (foundEnd && foundEnd[1] !== undefined) {
if (groups.has(foundEnd[1])){
onGroupedQuads(null, groups.get(foundEnd[1]));
groups.delete(foundEnd[1]);
}
}
onComment(comment);
},
onPrefix: onPrefix!
});
}
}</pre></td></tr></table></pre>
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