Function checkJsonSyntax

src/tools/ast/syntax-check.ts:93–107

(content: string)

/** Pure: JSON validation with a line number extracted from the parse error. */
export function checkJsonSyntax(content: string): SyntaxIssue[] {
  try {
    JSON.parse(content);
    return [];
  } catch (e: any) {
    const msg: string = e?.message ?? 'invalid JSON';
    let line = 1;
    const mPos = msg.match(/position (\d+)/i);
    const mLine = msg.match(/line (\d+)/i);
    if (mLine) line = parseInt(mLine[1], 10);
    else if (mPos) line = content.slice(0, parseInt(mPos[1], 10)).split('\n').length;
    const lines = content.split('\n');
    return [{ line, excerpt: (lines[line - 1] ?? '').trim().slice(0, 120), kind: 'error' }];
  }
}

/** Pure: the gate decision. Reject only if the EDIT introduced the breakage. */
export function shouldReject(beforeHadErrors: boolean | null, afterHasErrors: boolean): boolean {