Function evaluateFormula

src/nodeExecutor.ts:1891–1920

(formula: string, x: number)

// Formula evaluation function
function evaluateFormula(formula: string, x: number): number {
  // console.log(`Evaluating formula: "${formula}" with x=${x}`);

  // Sanitize the formula - only allow safe mathematical operations
  const sanitized = formula
    .replace(/\s+/g, "") // Remove whitespace
    .replace(/\^/g, "**") // Convert ^ to ** for exponentiation
    .replace(/[^x0-9+\-*/().\s]/g, ""); // Remove any unsafe characters

  // Replace 'x' with the actual value
  const expression = sanitized.replace(/x/g, x.toString());

  // Validate that the expression only contains safe characters
  if (!/^[0-9+\-*/().\s]+$/.test(expression)) {
    throw new Error("Invalid formula: contains unsafe characters");
  }

  try {
    // Use Function constructor for safe evaluation (better than eval)
    const result = new Function("return " + expression)();

    if (typeof result !== "number" || isNaN(result) || !isFinite(result)) {
      throw new Error("Formula evaluation resulted in invalid number");
    }

    return result;
  } catch (error) {
    throw new Error(`Formula evaluation failed: ${error instanceof Error ? error.message : "Unknown error"}`);
  }
}

async function executeColumnSelectionDropdownNode(
  nodeId: string,