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// 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
}
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