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// Copyright 2015, Joe Tsai. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build debug
package prefix
import (
"fmt"
"math"
"strings"
)
func max(a, b int) int {
if a > b {
return a
}
return b
}
func lenBase2(n uint) int {
return int(math.Ceil(math.Log2(float64(n + 1))))
}
func padBase2(v, n uint, m int) string {
s := fmt.Sprintf("%b", 1<<n|v)[1:]
if pad := m - len(s); pad > 0 {
return strings.Repeat(" ", pad) + s
}
return s
}
func lenBase10(n int) int {
return int(math.Ceil(math.Log10(float64(n + 1))))
}
func padBase10(n, m int) string {
s := fmt.Sprintf("%d", n)
if pad := m - len(s); pad > 0 {
return strings.Repeat(" ", pad) + s
}
return s
}
func (rc RangeCodes) String() string {
var maxLen, maxBase int
for _, c := range rc {
maxLen = max(maxLen, int(c.Len))
maxBase = max(maxBase, int(c.Base))
}
var ss []string
ss = append(ss, "{")
for i, c := range rc {
base := padBase10(int(c.Base), lenBase10(maxBase))
if c.Len > 0 {
base += fmt.Sprintf("-%d", c.End()-1)
}
ss = append(ss, fmt.Sprintf("\t%s: {len: %s, range: %s},",
padBase10(int(i), lenBase10(len(rc)-1)),
padBase10(int(c.Len), lenBase10(maxLen)),
base,
))
}
ss = append(ss, "}")
return strings.Join(ss, "\n")
}
func (pc PrefixCodes) String() string {
var maxSym, maxLen, maxCnt int
for _, c := range pc {
maxSym = max(maxSym, int(c.Sym))
maxLen = max(maxLen, int(c.Len))
maxCnt = max(maxCnt, int(c.Cnt))
}
var ss []string
ss = append(ss, "{")
for _, c := range pc {
var cntStr string
if maxCnt > 0 {
cnt := int(32*float32(c.Cnt)/float32(maxCnt) + 0.5)
cntStr = fmt.Sprintf("%s |%s",
padBase10(int(c.Cnt), lenBase10(maxCnt)),
strings.Repeat("#", cnt),
)
}
ss = append(ss, fmt.Sprintf("\t%s: %s, %s",
padBase10(int(c.Sym), lenBase10(maxSym)),
padBase2(uint(c.Val), uint(c.Len), maxLen),
cntStr,
))
}
ss = append(ss, "}")
return strings.Join(ss, "\n")
}
func (pd Decoder) String() string {
var ss []string
ss = append(ss, "{")
if len(pd.chunks) > 0 {
ss = append(ss, "\tchunks: {")
for i, c := range pd.chunks {
label := "sym"
if uint(c&countMask) > uint(pd.chunkBits) {
label = "idx"
}
ss = append(ss, fmt.Sprintf("\t\t%s: {%s: %s, len: %s}",
padBase2(uint(i), uint(pd.chunkBits), int(pd.chunkBits)),
label, padBase10(int(c>>countBits), 3),
padBase10(int(c&countMask), 2),
))
}
ss = append(ss, "\t},")
for j, links := range pd.links {
ss = append(ss, fmt.Sprintf("\tlinks[%d]: {", j))
linkBits := lenBase2(uint(pd.linkMask))
for i, c := range links {
ss = append(ss, fmt.Sprintf("\t\t%s: {sym: %s, len: %s},",
padBase2(uint(i), uint(linkBits), int(linkBits)),
padBase10(int(c>>countBits), 3),
padBase10(int(c&countMask), 2),
))
}
ss = append(ss, "\t},")
}
}
ss = append(ss, fmt.Sprintf("\tchunkMask: %b,", pd.chunkMask))
ss = append(ss, fmt.Sprintf("\tlinkMask: %b,", pd.linkMask))
ss = append(ss, fmt.Sprintf("\tchunkBits: %d,", pd.chunkBits))
ss = append(ss, fmt.Sprintf("\tMinBits: %d,", pd.MinBits))
ss = append(ss, fmt.Sprintf("\tNumSyms: %d,", pd.NumSyms))
ss = append(ss, "}")
return strings.Join(ss, "\n")
}
func (pe Encoder) String() string {
var maxLen int
for _, c := range pe.chunks {
maxLen = max(maxLen, int(c&countMask))
}
var ss []string
ss = append(ss, "{")
if len(pe.chunks) > 0 {
ss = append(ss, "\tchunks: {")
for i, c := range pe.chunks {
ss = append(ss, fmt.Sprintf("\t\t%s: %s,",
padBase10(i, 3),
padBase2(uint(c>>countBits), uint(c&countMask), maxLen),
))
}
ss = append(ss, "\t},")
}
ss = append(ss, fmt.Sprintf("\tchunkMask: %b,", pe.chunkMask))
ss = append(ss, fmt.Sprintf("\tNumSyms: %d,", pe.NumSyms))
ss = append(ss, "}")
return strings.Join(ss, "\n")
}
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