1 Star 0 Fork 0

lonely/gometalinter

加入 Gitee
与超过 1200万 开发者一起发现、参与优秀开源项目,私有仓库也完全免费 :)
免费加入
克隆/下载
compact.go 1.99 KB
一键复制 编辑 原始数据 按行查看 历史
// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package triegen
// This file defines Compacter and its implementations.
import "io"
// A Compacter generates an alternative, more space-efficient way to store a
// trie value block. A trie value block holds all possible values for the last
// byte of a UTF-8 encoded rune. Excluding ASCII characters, a trie value block
// always has 64 values, as a UTF-8 encoding ends with a byte in [0x80, 0xC0).
type Compacter interface {
// Size returns whether the Compacter could encode the given block as well
// as its size in case it can. len(v) is always 64.
Size(v []uint64) (sz int, ok bool)
// Store stores the block using the Compacter's compression method.
// It returns a handle with which the block can be retrieved.
// len(v) is always 64.
Store(v []uint64) uint32
// Print writes the data structures associated to the given store to w.
Print(w io.Writer) error
// Handler returns the name of a function that gets called during trie
// lookup for blocks generated by the Compacter. The function should be of
// the form func (n uint32, b byte) uint64, where n is the index returned by
// the Compacter's Store method and b is the last byte of the UTF-8
// encoding, where 0x80 <= b < 0xC0, for which to do the lookup in the
// block.
Handler() string
}
// simpleCompacter is the default Compacter used by builder. It implements a
// normal trie block.
type simpleCompacter builder
func (b *simpleCompacter) Size([]uint64) (sz int, ok bool) {
return blockSize * b.ValueSize, true
}
func (b *simpleCompacter) Store(v []uint64) uint32 {
h := uint32(len(b.ValueBlocks) - blockOffset)
b.ValueBlocks = append(b.ValueBlocks, v)
return h
}
func (b *simpleCompacter) Print(io.Writer) error {
// Structures are printed in print.go.
return nil
}
func (b *simpleCompacter) Handler() string {
panic("Handler should be special-cased for this Compacter")
}
马建仓 AI 助手
尝试更多
代码解读
代码找茬
代码优化
1
https://gitee.com/lonely0422/gometalinter.git
git@gitee.com:lonely0422/gometalinter.git
lonely0422
gometalinter
gometalinter
v2.0.12

搜索帮助