Tools/utils/textUtils.ts

/**
 * Safely replaces the first occurrence of a literal string within a text.
 * Throws if the string is not found or is ambiguous.
 */
export function safeLiteralReplace(text: string, oldStr: string, newStr: string): string {
  const index = text.indexOf(oldStr);
  if (index === -1) {
    throw new Error(`Target content not found in file.`);
  }
  
  const lastIndex = text.lastIndexOf(oldStr);
  if (index !== lastIndex) {
    throw new Error(`Target content is ambiguous (multiple occurrences found). Please provide more context.`);
  }
  
  return text.substring(0, index) + newStr + text.substring(index + oldStr.length);
}

/**
 * Normalizes line endings to LF.
 */
export function normalizeLineEndings(text: string): string {
  return text.replace(/\r\n/g, '\n');
}

/**
 * Truncates text with an ellipsis if it exceeds a maximum length.
 */
export function truncateText(text: string, maxLength: number): string {
  if (text.length <= maxLength) return text;
  return text.substring(0, maxLength) + '...';
}