wedb_embed 0.1.2

pub use crate::error::ERR_WRONG_TYPE;
pub const ERR_NO_SUCH_KEY: &str = "ERR no such key";
pub const ERR_INDEX_OUT_OF_RANGE: &str = "ERR index out of range";
pub const ERR_RANK_ZERO: &str = "ERR RANK can't be zero: must be 1, 2, 3, ... or -1, -2, -3...";

/// LPOS 选项配置（对标 Apache Kvrocks PosSpec）
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct PosSpec {
  /// 匹配项序号（1 为第 1 个，-1 为倒数第 1 个，禁止为 0）
  pub rank: i64,
  /// 最多返回的匹配项数量（None 表示返回单个匹配，Some(0) 表示返回全部匹配，Some(N) 表示返回最多 N 个匹配）
  pub count: Option<usize>,
  /// 最大扫描元素数（0 或 None 表示全量扫描）
  pub max_len: Option<usize>,
}

impl PosSpec {
  #[inline]
  pub const fn new() -> Self {
    Self {
      rank: 1,
      count: None,
      max_len: None,
    }
  }

  #[inline]
  pub const fn with_rank(mut self, rank: i64) -> Self {
    self.rank = rank;
    self
  }

  #[inline]
  pub const fn with_count(mut self, count: usize) -> Self {
    self.count = Some(count);
    self
  }

  #[inline]
  pub const fn with_max_len(mut self, max_len: usize) -> Self {
    self.max_len = Some(max_len);
    self
  }
}

impl Default for PosSpec {
  #[inline]
  fn default() -> Self {
    Self::new()
  }
}