1 files changed, 99 insertions, 0 deletions
diff --git a/src/cmd/vendor/rsc.io/markdown/break.go b/src/cmd/vendor/rsc.io/markdown/break.go
new file mode 100644
index 0000000000..c0ddaabffb
--- /dev/null
+++ b/src/cmd/vendor/rsc.io/markdown/break.go
@@ -0,0 +1,99 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package markdown
+
+import (
+	"bytes"
+)
+
+type ThematicBreak struct {
+	Position
+	raw string
+}
+
+func (b *ThematicBreak) PrintHTML(buf *bytes.Buffer) {
+	buf.WriteString("<hr />\n")
+}
+
+func (b *ThematicBreak) printMarkdown(buf *bytes.Buffer, s mdState) {
+	buf.WriteString(s.prefix)
+	buf.WriteString(b.raw)
+	buf.WriteByte('\n')
+}
+
+func newHR(p *parseState, s line) (line, bool) {
+	if isHR(s) {
+		p.doneBlock(&ThematicBreak{Position{p.lineno, p.lineno}, s.string()})
+		return line{}, true
+	}
+	return s, false
+}
+
+func isHR(s line) bool {
+	t := s
+	t.trimSpace(0, 3, false)
+	switch c := t.peek(); c {
+	case '-', '_', '*':
+		for i := 0; ; i++ {
+			if !t.trim(c) {
+				if i >= 3 {
+					break
+				}
+				return false
+			}
+			t.skipSpace()
+		}
+		return t.eof()
+	}
+	return false
+}
+
+type HardBreak struct{}
+
+func (*HardBreak) Inline() {}
+
+func (x *HardBreak) PrintHTML(buf *bytes.Buffer) {
+	buf.WriteString("<br />\n")
+}
+
+func (x *HardBreak) printMarkdown(buf *bytes.Buffer) {
+	buf.WriteString("\\\n")
+}
+
+func (x *HardBreak) PrintText(buf *bytes.Buffer) {
+	buf.WriteString("\n")
+}
+
+type SoftBreak struct{}
+
+func (*SoftBreak) Inline() {}
+
+func (x *SoftBreak) PrintHTML(buf *bytes.Buffer) {
+	buf.WriteString("\n")
+}
+
+func (x *SoftBreak) printMarkdown(buf *bytes.Buffer) {
+	buf.WriteString("\n")
+}
+
+func (x *SoftBreak) PrintText(buf *bytes.Buffer) {
+	buf.WriteString("\n")
+}
+
+func parseBreak(_ *parseState, s string, i int) (Inline, int, int, bool) {
+	start := i
+	for start > 0 && (s[start-1] == ' ' || s[start-1] == '\t') {
+		start--
+	}
+	end := i + 1
+	for end < len(s) && (s[end] == ' ' || s[end] == '\t') {
+		end++
+	}
+	// TODO: Do tabs count? That would be a mess.
+	if i >= 2 && s[i-1] == ' ' && s[i-2] == ' ' {
+		return &HardBreak{}, start, end, true
+	}
+	return &SoftBreak{}, start, end, true
+}