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package parser
import (
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
)
type thematicBreakPraser struct {
}
var defaultThematicBreakPraser = &thematicBreakPraser{}
// NewThematicBreakParser returns a new BlockParser that
// parses thematic breaks.
func NewThematicBreakParser() BlockParser {
return defaultThematicBreakPraser
}
func isThematicBreak(line []byte, offset int) bool {
w, pos := util.IndentWidth(line, offset)
if w > 3 {
return false
}
mark := byte(0)
count := 0
for i := pos; i < len(line); i++ {
c := line[i]
if util.IsSpace(c) {
continue
}
if mark == 0 {
mark = c
count = 1
if mark == '*' || mark == '-' || mark == '_' {
continue
}
return false
}
if c != mark {
return false
}
count++
}
return count > 2
}
func (b *thematicBreakPraser) Trigger() []byte {
return []byte{'-', '*', '_'}
}
func (b *thematicBreakPraser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
line, segment := reader.PeekLine()
if isThematicBreak(line, reader.LineOffset()) {
reader.Advance(segment.Len() - 1)
return ast.NewThematicBreak(), NoChildren
}
return nil, NoChildren
}
func (b *thematicBreakPraser) Continue(node ast.Node, reader text.Reader, pc Context) State {
return Close
}
func (b *thematicBreakPraser) Close(node ast.Node, reader text.Reader, pc Context) {
// nothing to do
}
func (b *thematicBreakPraser) CanInterruptParagraph() bool {
return true
}
func (b *thematicBreakPraser) CanAcceptIndentedLine() bool {
return false
}
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