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tabtofixed.go
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tabtofixed.go
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package textutil
import (
"math/bits"
"os"
"strings"
"unicode"
)
func NewTabFixer(tabLen int) func(string) (string, error) {
return newGridTabFixer(tabLen, tabbedGridConfig{})
}
func SQLInsert(tabLen int) func(string) (string, error) {
cfg := tabbedGridConfig{
GridFuncs: []func(grid [][]string) ([][]string, error){
func(grid [][]string) ([][]string, error) {
if len(grid) < 2 {
return grid, nil
}
for i, header := range grid[0] {
grid[0][i] = strings.Join([]string{"\"", "\","}, header)
}
// remove trailing comma from last header:
lastHeader := &grid[0][len(grid[0])-1]
*lastHeader = (*lastHeader)[:len(*lastHeader)-1]
grid[0] = append(grid[0], ") VALUES (")
const skipRows = 1
for i, row := range grid[skipRows:] {
for j, field := range row {
switch {
case strings.EqualFold(field, "null") || strings.HasPrefix(field, "@"):
// pass
default:
field = strings.Join(strings.Split(field, "'"), "''")
field = strings.Join([]string{"'", "'"}, field)
}
row[j] = field + ","
}
// remove trailing comma from last field:
lastField := &row[len(row)-1]
*lastField = (*lastField)[:len(*lastField)-1]
grid[skipRows+i] = append(row, "), (")
}
lastRow := grid[len(grid)-1]
lastRow[len(lastRow)-1] = ");"
return grid, nil
},
},
PostFuncs: []func(string) (string, error){
func(s string) (string, error) {
lines := strings.Split(s, endLine)
if len(lines) < 2 {
return s, nil
}
for i, line := range lines {
lines[i] = "\t" + strings.TrimRightFunc(line, unicode.IsSpace)
}
return strings.Join([]string{
"INSERT INTO \"tableName\" (",
endLine,
lines[0],
endLine,
strings.Join(lines[1:], endLine),
}, ""), nil
},
},
}
return newGridTabFixer(tabLen, cfg)
}
type tabbedGridConfig struct {
GridFuncs []func([][]string) ([][]string, error)
PostFuncs []func(string) (string, error)
}
func newGridTabFixer(tabLen int, cfg tabbedGridConfig) func(string) (string, error) {
return func(text string) (string, error) {
grid, maxColLengths := splitGrid(text, endLine, "\t")
for _, gf := range cfg.GridFuncs {
var err error
grid, err = gf(grid)
if err != nil {
return "", err
}
}
if len(cfg.GridFuncs) > 0 && len(grid) > 0 {
if len(grid[0]) != len(maxColLengths) {
maxColLengths = make([]int, len(grid[0]))
}
for _, fields := range grid {
for i, field := range fields {
if len(field) > maxColLengths[i] {
maxColLengths[i] = len(field)
}
}
}
}
colPaddings := make([]string, len(maxColLengths))
for i, length := range maxColLengths {
length = (length / tabLen) + 1
colPaddings[i] = strings.Repeat("\t", length)
maxColLengths[i] = length * tabLen
}
sb := make([]byte, 0, 1<<bits.Len(uint(len(text)+1)))
for _, fields := range grid {
for i, field := range fields {
paddingSpacesCount := maxColLengths[i] - len(field)
paddingTabsCount := paddingSpacesCount / tabLen
if paddingTabsCount*tabLen < paddingSpacesCount {
paddingTabsCount++
}
sb = append(sb, []byte(field)...)
sb = append(sb, []byte(colPaddings[i][:paddingTabsCount])...)
}
sb = append(sb, []byte(endLine)...)
}
s := string(sb)
for _, pf := range cfg.PostFuncs {
var err error
s, err = pf(s)
if err != nil {
return "", err
}
}
return s, nil
}
}
func splitGrid(text, lineSep, fieldSep string) (grid [][]string, maxColLengths []int) {
lines := strings.Split(text, lineSep)
for i := len(lines) - 1; i >= 0; i-- {
if strings.TrimSpace(lines[i]) != "" {
break
}
lines = lines[:i]
}
grid = make([][]string, len(lines))
fields := strings.Split(lines[0], fieldSep)
maxColLengths = make([]int, len(fields))
for i, field := range fields {
maxColLengths[i] = len(field)
}
grid[0] = fields
for i := 1; i < len(lines); i++ {
line := lines[i]
fields = strings.Split(line, fieldSep)
grid[i] = fields
for i, field := range fields {
if maxColLengths[i] < len(field) {
maxColLengths[i] = len(field)
}
}
}
return
}
// TODO: Any way to make this const?
var endLine string
func init() {
// TODO: What's the right way to check if we're running on Windows?
if os.DevNull == "NUL" {
endLine = "\r\n"
} else {
endLine = "\n"
}
}