Function prepareBaseCases

src/compute-engine/sequence.ts:170–192

* Prepare and sort base cases for matching. * Order: exact matches first, then patterns with fewer variables (more specific first).

(
  base: Map<number | string, Expression>
)

  pattern: ParsedPattern;
  value: Expression;
  /** Number of variables in pattern (more specific = fewer variables) */
  variableCount: number;
}

/**
 * Prepare and sort base cases for matching.
 * Order: exact matches first, then patterns with fewer variables (more specific first).
 */
function prepareBaseCases(
  base: Map<number | string, Expression>
): PreparedBaseCase[] {
  const cases: PreparedBaseCase[] = [];

  for (const [key, value] of base) {
    const pattern = parseBasePattern(key);
    const variableCount = pattern.values.filter(
      (v) => typeof v === 'string'
    ).length;
    cases.push({ pattern, value, variableCount });
  }

  // Sort: exact matches first, then by ascending variable count
  cases.sort((a, b) => {
    if (a.pattern.type !== b.pattern.type) {
      return a.pattern.type === 'exact' ? -1 : 1;
    }