319 lines
10 KiB
Go
319 lines
10 KiB
Go
package extension
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import (
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"bytes"
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"fmt"
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"regexp"
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"github.com/yuin/goldmark"
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gast "github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/extension/ast"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/renderer"
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"github.com/yuin/goldmark/renderer/html"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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)
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var tableDelimRegexp = regexp.MustCompile(`^[\s\-\|\:]+$`)
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var tableDelimLeft = regexp.MustCompile(`^\s*\:\-+\s*$`)
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var tableDelimRight = regexp.MustCompile(`^\s*\-+\:\s*$`)
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var tableDelimCenter = regexp.MustCompile(`^\s*\:\-+\:\s*$`)
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var tableDelimNone = regexp.MustCompile(`^\s*\-+\s*$`)
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type tableParagraphTransformer struct {
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}
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var defaultTableParagraphTransformer = &tableParagraphTransformer{}
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// NewTableParagraphTransformer returns a new ParagraphTransformer
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// that can transform paragraphs into tables.
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func NewTableParagraphTransformer() parser.ParagraphTransformer {
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return defaultTableParagraphTransformer
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}
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func (b *tableParagraphTransformer) Transform(node *gast.Paragraph, reader text.Reader, pc parser.Context) {
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lines := node.Lines()
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if lines.Len() < 2 {
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return
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}
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alignments := b.parseDelimiter(lines.At(1), reader)
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if alignments == nil {
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return
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}
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header := b.parseRow(lines.At(0), alignments, true, reader)
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if header == nil || len(alignments) != header.ChildCount() {
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return
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}
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table := ast.NewTable()
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table.Alignments = alignments
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table.AppendChild(table, ast.NewTableHeader(header))
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for i := 2; i < lines.Len(); i++ {
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table.AppendChild(table, b.parseRow(lines.At(i), alignments, false, reader))
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}
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node.Parent().InsertBefore(node.Parent(), node, table)
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node.Parent().RemoveChild(node.Parent(), node)
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}
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func (b *tableParagraphTransformer) parseRow(segment text.Segment, alignments []ast.Alignment, isHeader bool, reader text.Reader) *ast.TableRow {
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source := reader.Source()
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line := segment.Value(source)
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pos := 0
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pos += util.TrimLeftSpaceLength(line)
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limit := len(line)
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limit -= util.TrimRightSpaceLength(line)
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row := ast.NewTableRow(alignments)
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if len(line) > 0 && line[pos] == '|' {
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pos++
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}
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if len(line) > 0 && line[limit-1] == '|' {
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limit--
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}
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i := 0
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for ; pos < limit; i++ {
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alignment := ast.AlignNone
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if i >= len(alignments) {
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if !isHeader {
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return row
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}
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} else {
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alignment = alignments[i]
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}
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closure := util.FindClosure(line[pos:], byte(0), '|', true, false)
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if closure < 0 {
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closure = len(line[pos:])
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}
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node := ast.NewTableCell()
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seg := text.NewSegment(segment.Start+pos, segment.Start+pos+closure)
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seg = seg.TrimLeftSpace(source)
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seg = seg.TrimRightSpace(source)
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node.Lines().Append(seg)
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node.Alignment = alignment
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row.AppendChild(row, node)
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pos += closure + 1
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}
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for ; i < len(alignments); i++ {
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row.AppendChild(row, ast.NewTableCell())
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}
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return row
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}
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func (b *tableParagraphTransformer) parseDelimiter(segment text.Segment, reader text.Reader) []ast.Alignment {
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line := segment.Value(reader.Source())
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if !tableDelimRegexp.Match(line) {
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return nil
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}
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cols := bytes.Split(line, []byte{'|'})
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if util.IsBlank(cols[0]) {
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cols = cols[1:]
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}
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if len(cols) > 0 && util.IsBlank(cols[len(cols)-1]) {
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cols = cols[:len(cols)-1]
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}
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var alignments []ast.Alignment
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for _, col := range cols {
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if tableDelimLeft.Match(col) {
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alignments = append(alignments, ast.AlignLeft)
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} else if tableDelimRight.Match(col) {
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alignments = append(alignments, ast.AlignRight)
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} else if tableDelimCenter.Match(col) {
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alignments = append(alignments, ast.AlignCenter)
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} else if tableDelimNone.Match(col) {
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alignments = append(alignments, ast.AlignNone)
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} else {
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return nil
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}
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}
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return alignments
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}
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// TableHTMLRenderer is a renderer.NodeRenderer implementation that
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// renders Table nodes.
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type TableHTMLRenderer struct {
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html.Config
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}
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// NewTableHTMLRenderer returns a new TableHTMLRenderer.
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func NewTableHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
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r := &TableHTMLRenderer{
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Config: html.NewConfig(),
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}
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for _, opt := range opts {
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opt.SetHTMLOption(&r.Config)
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}
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return r
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}
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// RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.
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func (r *TableHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
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reg.Register(ast.KindTable, r.renderTable)
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reg.Register(ast.KindTableHeader, r.renderTableHeader)
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reg.Register(ast.KindTableRow, r.renderTableRow)
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reg.Register(ast.KindTableCell, r.renderTableCell)
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}
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// TableAttributeFilter defines attribute names which table elements can have.
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var TableAttributeFilter = html.GlobalAttributeFilter.Extend(
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[]byte("align"), // [Deprecated]
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[]byte("bgcolor"), // [Deprecated]
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[]byte("border"), // [Deprecated]
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[]byte("cellpadding"), // [Deprecated]
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[]byte("cellspacing"), // [Deprecated]
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[]byte("frame"), // [Deprecated]
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[]byte("rules"), // [Deprecated]
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[]byte("summary"), // [Deprecated]
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[]byte("width"), // [Deprecated]
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)
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func (r *TableHTMLRenderer) renderTable(w util.BufWriter, source []byte, n gast.Node, entering bool) (gast.WalkStatus, error) {
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if entering {
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_, _ = w.WriteString("<table")
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if n.Attributes() != nil {
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html.RenderAttributes(w, n, TableAttributeFilter)
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}
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_, _ = w.WriteString(">\n")
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} else {
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_, _ = w.WriteString("</table>\n")
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}
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return gast.WalkContinue, nil
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}
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// TableHeaderAttributeFilter defines attribute names which <thead> elements can have.
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var TableHeaderAttributeFilter = html.GlobalAttributeFilter.Extend(
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[]byte("align"), // [Deprecated since HTML4] [Obsolete since HTML5]
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[]byte("bgcolor"), // [Not Standardized]
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[]byte("char"), // [Deprecated since HTML4] [Obsolete since HTML5]
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[]byte("charoff"), // [Deprecated since HTML4] [Obsolete since HTML5]
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[]byte("valign"), // [Deprecated since HTML4] [Obsolete since HTML5]
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)
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func (r *TableHTMLRenderer) renderTableHeader(w util.BufWriter, source []byte, n gast.Node, entering bool) (gast.WalkStatus, error) {
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if entering {
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_, _ = w.WriteString("<thead")
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if n.Attributes() != nil {
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html.RenderAttributes(w, n, TableHeaderAttributeFilter)
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}
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_, _ = w.WriteString(">\n")
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_, _ = w.WriteString("<tr>\n") // Header <tr> has no separate handle
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} else {
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_, _ = w.WriteString("</tr>\n")
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_, _ = w.WriteString("</thead>\n")
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if n.NextSibling() != nil {
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_, _ = w.WriteString("<tbody>\n")
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}
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}
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return gast.WalkContinue, nil
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}
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// TableRowAttributeFilter defines attribute names which <tr> elements can have.
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var TableRowAttributeFilter = html.GlobalAttributeFilter.Extend(
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[]byte("align"), // [Obsolete since HTML5]
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[]byte("bgcolor"), // [Obsolete since HTML5]
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[]byte("char"), // [Obsolete since HTML5]
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[]byte("charoff"), // [Obsolete since HTML5]
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[]byte("valign"), // [Obsolete since HTML5]
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)
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func (r *TableHTMLRenderer) renderTableRow(w util.BufWriter, source []byte, n gast.Node, entering bool) (gast.WalkStatus, error) {
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if entering {
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_, _ = w.WriteString("<tr")
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if n.Attributes() != nil {
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html.RenderAttributes(w, n, TableRowAttributeFilter)
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}
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_, _ = w.WriteString(">\n")
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} else {
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_, _ = w.WriteString("</tr>\n")
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if n.Parent().LastChild() == n {
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_, _ = w.WriteString("</tbody>\n")
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}
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}
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return gast.WalkContinue, nil
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}
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// TableThCellAttributeFilter defines attribute names which table <th> cells can have.
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var TableThCellAttributeFilter = html.GlobalAttributeFilter.Extend(
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[]byte("abbr"), // [OK] Contains a short abbreviated description of the cell's content [NOT OK in <td>]
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[]byte("align"), // [Obsolete since HTML5]
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[]byte("axis"), // [Obsolete since HTML5]
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[]byte("bgcolor"), // [Not Standardized]
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[]byte("char"), // [Obsolete since HTML5]
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[]byte("charoff"), // [Obsolete since HTML5]
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[]byte("colspan"), // [OK] Number of columns that the cell is to span
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[]byte("headers"), // [OK] This attribute contains a list of space-separated strings, each corresponding to the id attribute of the <th> elements that apply to this element
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[]byte("height"), // [Deprecated since HTML4] [Obsolete since HTML5]
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[]byte("rowspan"), // [OK] Number of rows that the cell is to span
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[]byte("scope"), // [OK] This enumerated attribute defines the cells that the header (defined in the <th>) element relates to [NOT OK in <td>]
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[]byte("valign"), // [Obsolete since HTML5]
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[]byte("width"), // [Deprecated since HTML4] [Obsolete since HTML5]
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)
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// TableTdCellAttributeFilter defines attribute names which table <td> cells can have.
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var TableTdCellAttributeFilter = html.GlobalAttributeFilter.Extend(
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[]byte("abbr"), // [Obsolete since HTML5] [OK in <th>]
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[]byte("align"), // [Obsolete since HTML5]
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[]byte("axis"), // [Obsolete since HTML5]
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[]byte("bgcolor"), // [Not Standardized]
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[]byte("char"), // [Obsolete since HTML5]
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[]byte("charoff"), // [Obsolete since HTML5]
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[]byte("colspan"), // [OK] Number of columns that the cell is to span
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[]byte("headers"), // [OK] This attribute contains a list of space-separated strings, each corresponding to the id attribute of the <th> elements that apply to this element
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[]byte("height"), // [Deprecated since HTML4] [Obsolete since HTML5]
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[]byte("rowspan"), // [OK] Number of rows that the cell is to span
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[]byte("scope"), // [Obsolete since HTML5] [OK in <th>]
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[]byte("valign"), // [Obsolete since HTML5]
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[]byte("width"), // [Deprecated since HTML4] [Obsolete since HTML5]
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)
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func (r *TableHTMLRenderer) renderTableCell(w util.BufWriter, source []byte, node gast.Node, entering bool) (gast.WalkStatus, error) {
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n := node.(*ast.TableCell)
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tag := "td"
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if n.Parent().Kind() == ast.KindTableHeader {
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tag = "th"
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}
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if entering {
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align := ""
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if n.Alignment != ast.AlignNone {
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if _, ok := n.AttributeString("align"); !ok { // Skip align render if overridden
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// TODO: "align" is deprecated. style="text-align:%s" instead?
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align = fmt.Sprintf(` align="%s"`, n.Alignment.String())
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}
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}
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fmt.Fprintf(w, "<%s", tag)
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if n.Attributes() != nil {
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if tag == "td" {
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html.RenderAttributes(w, n, TableTdCellAttributeFilter) // <td>
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} else {
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html.RenderAttributes(w, n, TableThCellAttributeFilter) // <th>
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}
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}
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fmt.Fprintf(w, "%s>", align)
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} else {
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fmt.Fprintf(w, "</%s>\n", tag)
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}
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return gast.WalkContinue, nil
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}
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type table struct {
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}
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// Table is an extension that allow you to use GFM tables .
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var Table = &table{}
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func (e *table) Extend(m goldmark.Markdown) {
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m.Parser().AddOptions(parser.WithParagraphTransformers(
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util.Prioritized(NewTableParagraphTransformer(), 200),
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))
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m.Renderer().AddOptions(renderer.WithNodeRenderers(
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util.Prioritized(NewTableHTMLRenderer(), 500),
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))
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}
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