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package parser
import (
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
)
type listItemParser struct {
}
var defaultListItemParser = &listItemParser{}
// NewListItemParser returns a new BlockParser that
// parses list items.
func NewListItemParser() BlockParser {
return defaultListItemParser
}
func (b *listItemParser) Trigger() []byte {
return []byte{'-', '+', '*', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
}
func (b *listItemParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
list, lok := parent.(*ast.List)
if !lok { // list item must be a child of a list
return nil, NoChildren
}
offset := lastOffset(list)
line, _ := reader.PeekLine()
match, typ := matchesListItem(line, false)
if typ == notList {
return nil, NoChildren
}
if match[1]-offset > 3 {
return nil, NoChildren
}
pc.Set(emptyListItemWithBlankLines, nil)
itemOffset := calcListOffset(line, match)
node := ast.NewListItem(match[3] + itemOffset)
if match[4] < 0 || util.IsBlank(line[match[4]:match[5]]) {
return node, NoChildren
}
pos, padding := util.IndentPosition(line[match[4]:], match[4], itemOffset)
child := match[3] + pos
reader.AdvanceAndSetPadding(child, padding)
return node, HasChildren
}
func (b *listItemParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
line, _ := reader.PeekLine()
if util.IsBlank(line) {
reader.Advance(len(line) - 1)
return Continue | HasChildren
}
offset := lastOffset(node.Parent())
isEmpty := node.ChildCount() == 0
indent, _ := util.IndentWidth(line, reader.LineOffset())
if (isEmpty || indent < offset) && indent < 4 {
_, typ := matchesListItem(line, true)
// new list item found
if typ != notList {
pc.Set(skipListParserKey, listItemFlagValue)
return Close
}
if !isEmpty {
return Close
}
}
pos, padding := util.IndentPosition(line, reader.LineOffset(), offset)
reader.AdvanceAndSetPadding(pos, padding)
return Continue | HasChildren
}
func (b *listItemParser) Close(node ast.Node, reader text.Reader, pc Context) {
// nothing to do
}
func (b *listItemParser) CanInterruptParagraph() bool {
return true
}
func (b *listItemParser) CanAcceptIndentedLine() bool {
return false
}
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