Method parse

npm_modules/cli/src/utils/Digraph.ts:20–54

(str: string)

  }

  static parse(str: string): Digraph {
    const lines = str.split('\n');
    const graph = new Digraph();

    let index = 0;
    for (const line of lines) {
      const trimmedLine = line.trim();
      if (trimmedLine.startsWith('digraph ')) {
        if (index !== 0) {
          this.throwInvalidGraph();
        }
      } else if (trimmedLine === '}') {
        if (index !== lines.length - 1) {
          this.throwInvalidGraph();
        }
      } else if (trimmedLine.startsWith('node ')) {
          // no-op
      } else if (trimmedLine.startsWith('"')) {
          const edgeIndex = trimmedLine.indexOf('->');
          if (edgeIndex >= 0) {
            const fromEdge = unquote(trimmedLine.slice(0, edgeIndex).trim());
            const toEdge = unquote(trimmedLine.slice(edgeIndex + 2).trim());
            graph.addEdge(fromEdge, toEdge);
          } else {
            graph.getOrCreateNode(unquote(trimmedLine))
          }
      } else {
        this.throwInvalidGraph();
      }

      index++;
    }

    return graph;
  }

  private static throwInvalidGraph(): never {
    throw new Error('Could not parse digraph');