// Find exact syntax error in eval content
const fs = require('fs');
const acorn = require('acorn');

const content = fs.readFileSync('/tmp/eval_content.js', 'utf8');

try {
  acorn.parse(content, { ecmaVersion: 'latest', sourceType: 'script' });
  console.log('OK - no syntax error');
} catch (e) {
  console.log('Error:', e.message);
  console.log('Position:', e.pos);
  console.log('Line:', e.loc && e.loc.line);
  console.log('Column:', e.loc && e.loc.column);
  if (e.pos != null) {
    const start = Math.max(0, e.pos - 100);
    const end = Math.min(content.length, e.pos + 100);
    console.log('\nContext (100 chars before/after):');
    console.log('BEFORE:', JSON.stringify(content.slice(start, e.pos)));
    console.log('ERROR :', JSON.stringify(content.slice(e.pos, e.pos + 5)));
    console.log('AFTER :', JSON.stringify(content.slice(e.pos + 5, end)));
  }
}