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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package markdown
import (
"strings"
)
type ListItem struct {
blockBase
markdown string
hasTrailingBlankLine bool
hasBlankLineBetweenChildren bool
Indentation int
Children []Block
}
func (b *ListItem) Continuation(indentation int, r Range) *continuation {
s := b.markdown[r.Position:r.End]
if strings.TrimSpace(s) == "" {
if b.Children == nil {
return nil
}
return &continuation{
Remaining: r,
}
}
if indentation < b.Indentation {
return nil
}
return &continuation{
Indentation: indentation - b.Indentation,
Remaining: r,
}
}
func (b *ListItem) AddChild(openBlocks []Block) []Block {
b.Children = append(b.Children, openBlocks[0])
if b.hasTrailingBlankLine {
b.hasBlankLineBetweenChildren = true
}
b.hasTrailingBlankLine = false
return openBlocks
}
func (b *ListItem) AddLine(indentation int, r Range) bool {
isBlank := strings.TrimSpace(b.markdown[r.Position:r.End]) == ""
if isBlank {
b.hasTrailingBlankLine = true
}
return false
}
func (b *ListItem) HasTrailingBlankLine() bool {
return b.hasTrailingBlankLine || (len(b.Children) > 0 && b.Children[len(b.Children)-1].HasTrailingBlankLine())
}
func (b *ListItem) isLoose() bool {
if b.hasBlankLineBetweenChildren {
return true
}
for i, child := range b.Children {
if i < len(b.Children)-1 && child.HasTrailingBlankLine() {
return true
}
}
return false
}
type List struct {
blockBase
markdown string
hasTrailingBlankLine bool
hasBlankLineBetweenChildren bool
IsLoose bool
IsOrdered bool
OrderedStart int
BulletOrDelimiter byte
Children []*ListItem
}
func (b *List) Continuation(indentation int, r Range) *continuation {
s := b.markdown[r.Position:r.End]
if strings.TrimSpace(s) == "" {
return &continuation{
Remaining: r,
}
}
return &continuation{
Indentation: indentation,
Remaining: r,
}
}
func (b *List) AddChild(openBlocks []Block) []Block {
if item, ok := openBlocks[0].(*ListItem); ok {
b.Children = append(b.Children, item)
if b.hasTrailingBlankLine {
b.hasBlankLineBetweenChildren = true
}
b.hasTrailingBlankLine = false
return openBlocks
} else if list, ok := openBlocks[0].(*List); ok {
if len(list.Children) == 1 && list.IsOrdered == b.IsOrdered && list.BulletOrDelimiter == b.BulletOrDelimiter {
return b.AddChild(openBlocks[1:])
}
}
return nil
}
func (b *List) AddLine(indentation int, r Range) bool {
isBlank := strings.TrimSpace(b.markdown[r.Position:r.End]) == ""
if isBlank {
b.hasTrailingBlankLine = true
}
return false
}
func (b *List) HasTrailingBlankLine() bool {
return b.hasTrailingBlankLine || (len(b.Children) > 0 && b.Children[len(b.Children)-1].HasTrailingBlankLine())
}
func (b *List) isLoose() bool {
if b.hasBlankLineBetweenChildren {
return true
}
for i, child := range b.Children {
if child.isLoose() || (i < len(b.Children)-1 && child.HasTrailingBlankLine()) {
return true
}
}
return false
}
func (b *List) Close() {
b.IsLoose = b.isLoose()
}
func parseListMarker(markdown string, r Range) (success, isOrdered bool, orderedStart int, bulletOrDelimiter byte, markerWidth int, remaining Range) {
digits := 0
n := 0
for i := r.Position; i < r.End && markdown[i] >= '0' && markdown[i] <= '9'; i++ {
digits++
n = n*10 + int(markdown[i]-'0')
}
if digits > 0 {
if digits > 9 || r.Position+digits >= r.End {
return
}
next := markdown[r.Position+digits]
if next != '.' && next != ')' {
return
}
return true, true, n, next, digits + 1, Range{r.Position + digits + 1, r.End}
}
if r.Position >= r.End {
return
}
next := markdown[r.Position]
if next != '-' && next != '+' && next != '*' {
return
}
return true, false, 0, next, 1, Range{r.Position + 1, r.End}
}
func listStart(markdown string, indent int, r Range, matchedBlocks, unmatchedBlocks []Block) []Block {
afterList := false
if len(matchedBlocks) > 0 {
_, afterList = matchedBlocks[len(matchedBlocks)-1].(*List)
}
if !afterList && indent > 3 {
return nil
}
success, isOrdered, orderedStart, bulletOrDelimiter, markerWidth, remaining := parseListMarker(markdown, r)
if !success {
return nil
}
isBlank := strings.TrimSpace(markdown[remaining.Position:remaining.End]) == ""
if len(matchedBlocks) > 0 && len(unmatchedBlocks) == 0 {
if _, ok := matchedBlocks[len(matchedBlocks)-1].(*Paragraph); ok {
if isBlank || (isOrdered && orderedStart != 1) {
return nil
}
}
}
indentAfterMarker, indentBytesAfterMarker := countIndentation(markdown, remaining)
if !isBlank && indentAfterMarker < 1 {
return nil
}
remaining = Range{remaining.Position + indentBytesAfterMarker, remaining.End}
consumedIndentAfterMarker := indentAfterMarker
if isBlank || indentAfterMarker >= 5 {
consumedIndentAfterMarker = 1
}
listItem := &ListItem{
markdown: markdown,
Indentation: indent + markerWidth + consumedIndentAfterMarker,
}
list := &List{
markdown: markdown,
IsOrdered: isOrdered,
OrderedStart: orderedStart,
BulletOrDelimiter: bulletOrDelimiter,
Children: []*ListItem{listItem},
}
ret := []Block{list, listItem}
if descendants := blockStartOrParagraph(markdown, indentAfterMarker-consumedIndentAfterMarker, remaining, nil, nil); descendants != nil {
listItem.Children = append(listItem.Children, descendants[0])
ret = append(ret, descendants...)
}
return ret
}
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