A fork of Gitea (see branch `mj`) adding Majority Judgment Polls 𐄷 over Issues and Merge Requests. https://git.mieuxvoter.fr
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package parser
import (
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
"strconv"
)
type listItemType int
const (
notList listItemType = iota
bulletList
orderedList
)
// Same as
// `^(([ ]*)([\-\*\+]))(\s+.*)?\n?$`.FindSubmatchIndex or
// `^(([ ]*)(\d{1,9}[\.\)]))(\s+.*)?\n?$`.FindSubmatchIndex
func parseListItem(line []byte) ([6]int, listItemType) {
i := 0
l := len(line)
ret := [6]int{}
for ; i < l && line[i] == ' '; i++ {
c := line[i]
if c == '\t' {
return ret, notList
}
}
if i > 3 {
return ret, notList
}
ret[0] = 0
ret[1] = i
ret[2] = i
var typ listItemType
if i < l && (line[i] == '-' || line[i] == '*' || line[i] == '+') {
i++
ret[3] = i
typ = bulletList
} else if i < l {
for ; i < l && util.IsNumeric(line[i]); i++ {
}
ret[3] = i
if ret[3] == ret[2] || ret[3]-ret[2] > 9 {
return ret, notList
}
if i < l && (line[i] == '.' || line[i] == ')') {
i++
ret[3] = i
} else {
return ret, notList
}
typ = orderedList
} else {
return ret, notList
}
if i < l && line[i] != '\n' {
w, _ := util.IndentWidth(line[i:], 0)
if w == 0 {
return ret, notList
}
}
if i >= l {
ret[4] = -1
ret[5] = -1
return ret, typ
}
ret[4] = i
ret[5] = len(line)
if line[ret[5]-1] == '\n' && line[i] != '\n' {
ret[5]--
}
return ret, typ
}
func matchesListItem(source []byte, strict bool) ([6]int, listItemType) {
m, typ := parseListItem(source)
if typ != notList && (!strict || strict && m[1] < 4) {
return m, typ
}
return m, notList
}
func calcListOffset(source []byte, match [6]int) int {
offset := 0
if match[4] < 0 || util.IsBlank(source[match[4]:]) { // list item starts with a blank line
offset = 1
} else {
offset, _ = util.IndentWidth(source[match[4]:], match[4])
if offset > 4 { // offseted codeblock
offset = 1
}
}
return offset
}
func lastOffset(node ast.Node) int {
lastChild := node.LastChild()
if lastChild != nil {
return lastChild.(*ast.ListItem).Offset
}
return 0
}
type listParser struct {
}
var defaultListParser = &listParser{}
// NewListParser returns a new BlockParser that
// parses lists.
// This parser must take precedence over the ListItemParser.
func NewListParser() BlockParser {
return defaultListParser
}
func (b *listParser) Trigger() []byte {
return []byte{'-', '+', '*', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
}
func (b *listParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
last := pc.LastOpenedBlock().Node
if _, lok := last.(*ast.List); lok || pc.Get(skipListParser) != nil {
pc.Set(skipListParser, nil)
return nil, NoChildren
}
line, _ := reader.PeekLine()
match, typ := matchesListItem(line, true)
if typ == notList {
return nil, NoChildren
}
start := -1
if typ == orderedList {
number := line[match[2] : match[3]-1]
start, _ = strconv.Atoi(string(number))
}
if ast.IsParagraph(last) && last.Parent() == parent {
// we allow only lists starting with 1 to interrupt paragraphs.
if typ == orderedList && start != 1 {
return nil, NoChildren
}
//an empty list item cannot interrupt a paragraph:
if match[5]-match[4] == 1 {
return nil, NoChildren
}
}
marker := line[match[3]-1]
node := ast.NewList(marker)
if start > -1 {
node.Start = start
}
return node, HasChildren
}
func (b *listParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
list := node.(*ast.List)
line, _ := reader.PeekLine()
if util.IsBlank(line) {
// A list item can begin with at most one blank line
if node.ChildCount() == 1 && node.LastChild().ChildCount() == 0 {
return Close
}
return Continue | HasChildren
}
// "offset" means a width that bar indicates.
// - aaaaaaaa
// |----|
//
// If the indent is less than the last offset like
// - a
// - b <--- current line
// it maybe a new child of the list.
offset := lastOffset(node)
indent, _ := util.IndentWidth(line, reader.LineOffset())
if indent < offset {
if indent < 4 {
match, typ := matchesListItem(line, false) // may have a leading spaces more than 3
if typ != notList && match[1]-offset < 4 {
marker := line[match[3]-1]
if !list.CanContinue(marker, typ == orderedList) {
return Close
}
// Thematic Breaks take precedence over lists
if isThematicBreak(line[match[3]-1:], 0) {
isHeading := false
last := pc.LastOpenedBlock().Node
if ast.IsParagraph(last) {
c, ok := matchesSetextHeadingBar(line)
if ok && c == '-' {
isHeading = true
}
}
if !isHeading {
return Close
}
}
return Continue | HasChildren
}
}
return Close
}
return Continue | HasChildren
}
func (b *listParser) Close(node ast.Node, reader text.Reader, pc Context) {
list := node.(*ast.List)
for c := node.FirstChild(); c != nil && list.IsTight; c = c.NextSibling() {
if c.FirstChild() != nil && c.FirstChild() != c.LastChild() {
for c1 := c.FirstChild().NextSibling(); c1 != nil; c1 = c1.NextSibling() {
if bl, ok := c1.(ast.Node); ok && bl.HasBlankPreviousLines() {
list.IsTight = false
break
}
}
}
if c != node.FirstChild() {
if bl, ok := c.(ast.Node); ok && bl.HasBlankPreviousLines() {
list.IsTight = false
}
}
}
if list.IsTight {
for child := node.FirstChild(); child != nil; child = child.NextSibling() {
for gc := child.FirstChild(); gc != nil; gc = gc.NextSibling() {
paragraph, ok := gc.(*ast.Paragraph)
if ok {
textBlock := ast.NewTextBlock()
textBlock.SetLines(paragraph.Lines())
child.ReplaceChild(child, paragraph, textBlock)
}
}
}
}
}
func (b *listParser) CanInterruptParagraph() bool {
return true
}
func (b *listParser) CanAcceptIndentedLine() bool {
return false
}