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查找匹配字符的规则；若无匹配则尝试默认规则。 Finds a rule for the character, falling back to the default rule.
按 ID 查找规则；不存在时返回 null。 Looks up a rule by ID, returning null when absent.
查找匹配字符的规则；若无匹配则尝试默认规则。 Finds a rule for the character, falling back to the default rule.
按 ID 查找规则；不存在时返回 null。 Looks up a rule by ID, returning null when absent.