Implemented tables

Render.go

@@ -11,10 +11,12 @@ var (
 )
 
 type renderer struct {
-	out            strings.Builder
-	paragraphLevel int
-	quoteLevel     int
-	listLevel      int
+	out                strings.Builder
+	paragraphLevel     int
+	quoteLevel         int
+	listLevel          int
+	tableLevel         int
+	tableHeaderWritten bool
 }
 
 // Render creates HTML from the supplied markdown text.
@@ -104,6 +106,51 @@ func (r *renderer) processLine(line string) {
 		r.writeText(line)
 		r.out.WriteString("</li>")
 		return
+
+	case '|':
+		r.closeParagraphs()
+		line = line[1:]
+
+		if r.tableLevel == 0 {
+			r.out.WriteString("<table><thead>")
+			r.tableLevel++
+		}
+
+		column := 0
+
+		for {
+			pipe := strings.IndexByte(line, '|')
+
+			if pipe == -1 {
+				r.out.WriteString("</tr>")
+				return
+			}
+
+			content := strings.TrimSpace(line[:pipe])
+
+			if strings.HasPrefix(content, "---") {
+				r.out.WriteString("</thead><tbody>")
+				r.tableHeaderWritten = true
+				return
+			}
+
+			if column == 0 {
+				r.out.WriteString("<tr>")
+			}
+
+			if r.tableHeaderWritten {
+				r.out.WriteString("<td>")
+				r.writeText(content)
+				r.out.WriteString("</td>")
+			} else {
+				r.out.WriteString("<th>")
+				r.writeText(content)
+				r.out.WriteString("</th>")
+			}
+
+			line = line[pipe+1:]
+			column++
+		}
 	}
 
 	if r.paragraphLevel == 0 {
@@ -121,6 +168,7 @@ func (r *renderer) processLine(line string) {
 func (r *renderer) closeAll() {
 	r.closeLists()
 	r.closeParagraphs()
+	r.closeTables()
 }
 
 // closeParagraphs closes open paragraphs.
@@ -141,6 +189,16 @@ func (r *renderer) closeLists() {
 	r.listLevel = 0
 }
 
+// closeTables closes open tables.
+func (r *renderer) closeTables() {
+	for range r.tableLevel {
+		r.out.WriteString("</tbody></table>")
+	}
+
+	r.tableLevel = 0
+	r.tableHeaderWritten = false
+}
+
 // writeText converts inline markdown to HTML.
 func (r *renderer) writeText(markdown string) {
 	var (