99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
// Copyright 2014 Oleku Konko All rights reserved.
|
|
// Use of this source code is governed by a MIT
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// This module is a Table Writer API for the Go Programming Language.
|
|
// The protocols were written in pure Go and works on windows and unix systems
|
|
|
|
package tablewriter
|
|
|
|
import (
|
|
"math"
|
|
"strings"
|
|
|
|
"github.com/mattn/go-runewidth"
|
|
)
|
|
|
|
var (
|
|
nl = "\n"
|
|
sp = " "
|
|
)
|
|
|
|
const defaultPenalty = 1e5
|
|
|
|
// Wrap wraps s into a paragraph of lines of length lim, with minimal
|
|
// raggedness.
|
|
func WrapString(s string, lim int) ([]string, int) {
|
|
words := strings.Split(strings.Replace(s, nl, sp, -1), sp)
|
|
var lines []string
|
|
max := 0
|
|
for _, v := range words {
|
|
max = runewidth.StringWidth(v)
|
|
if max > lim {
|
|
lim = max
|
|
}
|
|
}
|
|
for _, line := range WrapWords(words, 1, lim, defaultPenalty) {
|
|
lines = append(lines, strings.Join(line, sp))
|
|
}
|
|
return lines, lim
|
|
}
|
|
|
|
// WrapWords is the low-level line-breaking algorithm, useful if you need more
|
|
// control over the details of the text wrapping process. For most uses,
|
|
// WrapString will be sufficient and more convenient.
|
|
//
|
|
// WrapWords splits a list of words into lines with minimal "raggedness",
|
|
// treating each rune as one unit, accounting for spc units between adjacent
|
|
// words on each line, and attempting to limit lines to lim units. Raggedness
|
|
// is the total error over all lines, where error is the square of the
|
|
// difference of the length of the line and lim. Too-long lines (which only
|
|
// happen when a single word is longer than lim units) have pen penalty units
|
|
// added to the error.
|
|
func WrapWords(words []string, spc, lim, pen int) [][]string {
|
|
n := len(words)
|
|
|
|
length := make([][]int, n)
|
|
for i := 0; i < n; i++ {
|
|
length[i] = make([]int, n)
|
|
length[i][i] = runewidth.StringWidth(words[i])
|
|
for j := i + 1; j < n; j++ {
|
|
length[i][j] = length[i][j-1] + spc + runewidth.StringWidth(words[j])
|
|
}
|
|
}
|
|
nbrk := make([]int, n)
|
|
cost := make([]int, n)
|
|
for i := range cost {
|
|
cost[i] = math.MaxInt32
|
|
}
|
|
for i := n - 1; i >= 0; i-- {
|
|
if length[i][n-1] <= lim {
|
|
cost[i] = 0
|
|
nbrk[i] = n
|
|
} else {
|
|
for j := i + 1; j < n; j++ {
|
|
d := lim - length[i][j-1]
|
|
c := d*d + cost[j]
|
|
if length[i][j-1] > lim {
|
|
c += pen // too-long lines get a worse penalty
|
|
}
|
|
if c < cost[i] {
|
|
cost[i] = c
|
|
nbrk[i] = j
|
|
}
|
|
}
|
|
}
|
|
}
|
|
var lines [][]string
|
|
i := 0
|
|
for i < n {
|
|
lines = append(lines, words[i:nbrk[i]])
|
|
i = nbrk[i]
|
|
}
|
|
return lines
|
|
}
|
|
|
|
// getLines decomposes a multiline string into a slice of strings.
|
|
func getLines(s string) []string {
|
|
return strings.Split(s, nl)
|
|
}
|