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table.go
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table.go
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package markdown
import (
"bytes"
"fmt"
"io"
"unicode/utf8"
)
const (
NoAlign = iota
AlignLeft
AlignCenter
AlignRight
)
var (
tableColSep = []byte("|")
hyphen = []byte("-")
colon = []byte(":")
space = []byte(" ")
br = []byte("<br/>")
)
// CellP renders a paragraph for table cell.
func CellP(blocks ...Block) Block {
return Wrap(nil, br, blocks...)
}
type Table struct {
columns []*tableHeader
rows [][]Block
}
type tableHeader struct {
Title []byte
Align uint8
}
func (t *Table) AddColumn(title string, align uint8) {
t.columns = append(t.columns, &tableHeader{
Title: []byte(title),
Align: align,
})
}
func (t *Table) AppendRow(cols ...Block) {
t.rows = append(t.rows, cols)
}
func (t *Table) AppendRowT(cols ...string) {
blocks := make([]Block, 0, len(cols))
for _, s := range cols {
blocks = append(blocks, T(s))
}
t.AppendRow(blocks...)
}
func (t *Table) Markdown(w io.Writer) error { //nolint:funlen,gocognit,gocyclo,cyclop
const (
minWidth = 3
emptyWidth = 5
)
headers := make([]*tableHeader, len(t.columns))
copy(headers, t.columns)
widths := make([]int, len(t.columns))
for i, col := range headers {
colWidth := utf8.RuneCount(col.Title)
if colWidth < minWidth {
colWidth = minWidth
}
widths[i] = colWidth
}
rows := make([][][]byte, 0, len(t.rows))
for _, row := range t.rows {
cols := make([][]byte, 0, len(row))
for i, col := range row {
if i > len(headers) {
headers = append(headers, &tableHeader{Title: space}) //nolint:makezero
widths = append(widths, emptyWidth) //nolint:makezero
}
buf := bytes.NewBuffer(nil)
if err := col.Markdown(buf); err != nil {
return err
}
cols = append(cols, buf.Bytes())
if wd := utf8.RuneCount(buf.Bytes()); wd > widths[i] {
widths[i] = wd
}
}
rows = append(rows, cols)
}
if _, err := w.Write(tableColSep); err != nil {
return err
}
for i, hdr := range headers {
align := padLeft
switch hdr.Align {
case AlignCenter:
align = center
case AlignRight:
align = right
}
if _, err := w.Write(space); err != nil {
return err
}
if _, err := w.Write(align(hdr.Title, widths[i])); err != nil {
return err
}
if _, err := w.Write(space); err != nil {
return err
}
if _, err := w.Write(tableColSep); err != nil {
return err
}
}
if _, err := w.Write(newline); err != nil {
return err
}
if _, err := w.Write(tableColSep); err != nil {
return err
}
for i, col := range headers {
switch col.Align {
case AlignLeft:
if _, err := w.Write(colon); err != nil {
return err
}
if _, err := w.Write(bytes.Repeat(hyphen, widths[i]+1)); err != nil {
return err
}
case AlignCenter:
if _, err := w.Write(colon); err != nil {
return err
}
if _, err := w.Write(bytes.Repeat(hyphen, widths[i])); err != nil {
return err
}
if _, err := w.Write(colon); err != nil {
return err
}
case AlignRight:
if _, err := w.Write(bytes.Repeat(hyphen, widths[i]+1)); err != nil {
return err
}
if _, err := w.Write(colon); err != nil {
return err
}
default:
if _, err := w.Write(bytes.Repeat(hyphen, widths[i]+2)); err != nil { //nolint:gomnd
return err
}
}
if _, err := w.Write(tableColSep); err != nil {
return err
}
}
if _, err := w.Write(newline); err != nil {
return err
}
for _, row := range rows {
if _, err := w.Write(tableColSep); err != nil {
return err
}
for i, col := range row {
align := padLeft
switch headers[i].Align {
case AlignCenter:
align = center
case AlignRight:
align = right
}
if _, err := w.Write(space); err != nil {
return err
}
if _, err := w.Write(align(col, widths[i])); err != nil {
return err
}
if _, err := w.Write(space); err != nil {
return err
}
if _, err := w.Write(tableColSep); err != nil {
return err
}
}
if _, err := w.Write(newline); err != nil {
return err
}
}
return nil
}
func padLeft(b []byte, w int) []byte {
return []byte(fmt.Sprintf("%*s", -w, string(b)))
}
func center(b []byte, w int) []byte {
s := string(b)
return []byte(fmt.Sprintf("%*s", -w, fmt.Sprintf("%*s", (w+len(s))/2, s))) //nolint:gomnd
}
func right(b []byte, w int) []byte {
return []byte(fmt.Sprintf("%*s", w, string(b)))
}