Rewrite markdown rendering to blackfriday v2 and rewrite orgmode rendering to go-org (#8560)

* Rewrite markdown rendering to blackfriday v2.0

* Fix style

* Fix go mod with golang 1.13

* Fix blackfriday v2 import

* Inital orgmode renderer migration to go-org

* Vendor go-org dependency

* Ignore errors :/

* Update go-org to latest version

* Update test

* Fix go-org test

* Remove unneeded code

* Fix comments

* Fix markdown test

* Fix blackfriday regression rendering HTML block

vendor/github.com/niklasfasching/go-org/org/table.go

@@ -0,0 +1,130 @@
+package org
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+)
+
+type Table struct {
+	Rows        []Row
+	ColumnInfos []ColumnInfo
+}
+
+type Row struct {
+	Columns   []Column
+	IsSpecial bool
+}
+
+type Column struct {
+	Children []Node
+	*ColumnInfo
+}
+
+type ColumnInfo struct {
+	Align string
+	Len   int
+}
+
+var tableSeparatorRegexp = regexp.MustCompile(`^(\s*)(\|[+-|]*)\s*$`)
+var tableRowRegexp = regexp.MustCompile(`^(\s*)(\|.*)`)
+
+var columnAlignRegexp = regexp.MustCompile(`^<(l|c|r)>$`)
+
+func lexTable(line string) (token, bool) {
+	if m := tableSeparatorRegexp.FindStringSubmatch(line); m != nil {
+		return token{"tableSeparator", len(m[1]), m[2], m}, true
+	} else if m := tableRowRegexp.FindStringSubmatch(line); m != nil {
+		return token{"tableRow", len(m[1]), m[2], m}, true
+	}
+	return nilToken, false
+}
+
+func (d *Document) parseTable(i int, parentStop stopFn) (int, Node) {
+	rawRows, start := [][]string{}, i
+	for ; !parentStop(d, i); i++ {
+		if t := d.tokens[i]; t.kind == "tableRow" {
+			rawRow := strings.FieldsFunc(d.tokens[i].content, func(r rune) bool { return r == '|' })
+			for i := range rawRow {
+				rawRow[i] = strings.TrimSpace(rawRow[i])
+			}
+			rawRows = append(rawRows, rawRow)
+		} else if t.kind == "tableSeparator" {
+			rawRows = append(rawRows, nil)
+		} else {
+			break
+		}
+	}
+
+	table := Table{nil, getColumnInfos(rawRows)}
+	for _, rawColumns := range rawRows {
+		row := Row{nil, isSpecialRow(rawColumns)}
+		if len(rawColumns) != 0 {
+			for i := range table.ColumnInfos {
+				column := Column{nil, &table.ColumnInfos[i]}
+				if i < len(rawColumns) {
+					column.Children = d.parseInline(rawColumns[i])
+				}
+				row.Columns = append(row.Columns, column)
+			}
+		}
+		table.Rows = append(table.Rows, row)
+	}
+	return i - start, table
+}
+
+func getColumnInfos(rows [][]string) []ColumnInfo {
+	columnCount := 0
+	for _, columns := range rows {
+		if n := len(columns); n > columnCount {
+			columnCount = n
+		}
+	}
+
+	columnInfos := make([]ColumnInfo, columnCount)
+	for i := 0; i < columnCount; i++ {
+		countNumeric, countNonNumeric := 0, 0
+		for _, columns := range rows {
+			if i >= len(columns) {
+				continue
+			}
+
+			if n := utf8.RuneCountInString(columns[i]); n > columnInfos[i].Len {
+				columnInfos[i].Len = n
+			}
+
+			if m := columnAlignRegexp.FindStringSubmatch(columns[i]); m != nil && isSpecialRow(columns) {
+				switch m[1] {
+				case "l":
+					columnInfos[i].Align = "left"
+				case "c":
+					columnInfos[i].Align = "center"
+				case "r":
+					columnInfos[i].Align = "right"
+				}
+			} else if _, err := strconv.ParseFloat(columns[i], 32); err == nil {
+				countNumeric++
+			} else if strings.TrimSpace(columns[i]) != "" {
+				countNonNumeric++
+			}
+		}
+
+		if columnInfos[i].Align == "" && countNumeric >= countNonNumeric {
+			columnInfos[i].Align = "right"
+		}
+	}
+	return columnInfos
+}
+
+func isSpecialRow(rawColumns []string) bool {
+	isAlignRow := true
+	for _, rawColumn := range rawColumns {
+		if !columnAlignRegexp.MatchString(rawColumn) && rawColumn != "" {
+			isAlignRow = false
+		}
+	}
+	return isAlignRow
+}
+
+func (n Table) String() string { return orgWriter.nodesAsString(n) }