import { tokenize } from "./tokenize";

/**
 * Removes all variants from head and then searches for patterns, reducing
 * matches after the first.
 */
export function patternReduce(tokens: string[], patterns: RegExp[]): string[] {
  if (tokens.length === 0) {
    return [];
  }
  let classString = tokens.map((t) => t.replace(/.*:/, "")).join(" ");

  for (const pattern of patterns) {
    const matches = classString.matchAll(pattern);
    let idx = 0;
    for (const match of matches) {
      if (idx !== 0) {
        classString = classString.replace(match[0], "");
      }
      idx++;
    }
  }

  return tokenize(classString);
}