@antv/infographic

--- install scripts ---
### prepublishOnly
npm run ci



--- package/src/syntax/relations.ts (excerpt) ---
import type { ItemDatum, RelationEdgeDatum } from '../types';
import { mapWithSchema } from './mapper';
import { RelationSchema } from './schema';
import type { SyntaxError, SyntaxNode } from './types';

const RELATION_TOKEN = /(?:[<>o.x-]{2,}|[<>=]{2,})/;
const ARROW_TOKEN = /(?:[<>o.x-]{2,}|[<>=]{2,})/g;

interface ParsedNode {
  id: string;
  label?: string;
}

interface ParsedEdge {
  label?: string;
  direction: 'forward' | 'both' | 'none';
  reverse: boolean;
  nextIndex: number;
}

function normalizeLabel(text: string) {
  let label = text.trim();
  if (!label) return '';
  const first = label[0];
  const last = label[label.length - 1];
  if ((first === '"' && last === '"') || (first === "'" && last === "'")) {
    label = label.slice(1, -1);
  }
  label = label
    .replace(/\\(["'])/g, '$1')
    .replace(/(&quot;|&#quot;|#quot;)/g, '"')
    .replace(/(&apos;|&#39;|#apos;)/g, "'");
  return label.trim();
}

function stripEdgeLabelPrefix(text: string) {
  const trimmed = text
    .trim()
    .replace(/^[-=.ox]+/, '')
    .trim();
  return normalizeLabel(trimmed);
}

function skipSpaces(text: string, index: number) {
  let cursor = index;
  while (cursor < text.length && /\s/.test(text[cursor])) {
    cursor += 1;
  }
  return cursor;
}

function readNode(text: string, startIndex: number) {
  let index = skipSpaces(text, startIndex);
  if (index >= text.length) return null;
  const idStart = index;
  while (index < text.length) {
    const char = text[index];
    if (