mirror of
https://github.com/go-gitea/gitea.git
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* Move to goldmark Markdown rendering moved from blackfriday to the goldmark. Multiple subtle changes required to the goldmark extensions to keep current rendering and defaults. Can go further with goldmark linkify and have this work within markdown rendering making the link processor unnecessary. Need to think about how to go about allowing extensions - at present it seems that these would be hard to do without recompilation. * linter fixes Co-authored-by: Lauris BH <lauris@nix.lv>
229 lines
6.0 KiB
Go
229 lines
6.0 KiB
Go
package parser
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import (
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"bytes"
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"regexp"
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"strings"
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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)
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var allowedBlockTags = map[string]bool{
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"address": true,
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"article": true,
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"aside": true,
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"base": true,
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"basefont": true,
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"blockquote": true,
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"body": true,
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"caption": true,
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"center": true,
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"col": true,
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"colgroup": true,
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"dd": true,
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"details": true,
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"dialog": true,
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"dir": true,
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"div": true,
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"dl": true,
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"dt": true,
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"fieldset": true,
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"figcaption": true,
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"figure": true,
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"footer": true,
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"form": true,
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"frame": true,
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"frameset": true,
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"h1": true,
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"h2": true,
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"h3": true,
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"h4": true,
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"h5": true,
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"h6": true,
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"head": true,
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"header": true,
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"hr": true,
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"html": true,
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"iframe": true,
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"legend": true,
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"li": true,
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"link": true,
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"main": true,
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"menu": true,
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"menuitem": true,
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"meta": true,
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"nav": true,
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"noframes": true,
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"ol": true,
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"optgroup": true,
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"option": true,
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"p": true,
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"param": true,
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"section": true,
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"source": true,
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"summary": true,
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"table": true,
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"tbody": true,
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"td": true,
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"tfoot": true,
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"th": true,
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"thead": true,
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"title": true,
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"tr": true,
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"track": true,
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"ul": true,
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}
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var htmlBlockType1OpenRegexp = regexp.MustCompile(`(?i)^[ ]{0,3}<(script|pre|style)(?:\s.*|>.*|/>.*|)\n?$`)
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var htmlBlockType1CloseRegexp = regexp.MustCompile(`(?i)^.*</(?:script|pre|style)>.*`)
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var htmlBlockType2OpenRegexp = regexp.MustCompile(`^[ ]{0,3}<!\-\-`)
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var htmlBlockType2Close = []byte{'-', '-', '>'}
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var htmlBlockType3OpenRegexp = regexp.MustCompile(`^[ ]{0,3}<\?`)
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var htmlBlockType3Close = []byte{'?', '>'}
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var htmlBlockType4OpenRegexp = regexp.MustCompile(`^[ ]{0,3}<![A-Z]+.*\n?$`)
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var htmlBlockType4Close = []byte{'>'}
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var htmlBlockType5OpenRegexp = regexp.MustCompile(`^[ ]{0,3}<\!\[CDATA\[`)
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var htmlBlockType5Close = []byte{']', ']', '>'}
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var htmlBlockType6Regexp = regexp.MustCompile(`^[ ]{0,3}</?([a-zA-Z0-9]+)(?:\s.*|>.*|/>.*|)\n?$`)
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var htmlBlockType7Regexp = regexp.MustCompile(`^[ ]{0,3}<(/)?([a-zA-Z0-9]+)(` + attributePattern + `*)(:?>|/>)\s*\n?$`)
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type htmlBlockParser struct {
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}
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var defaultHTMLBlockParser = &htmlBlockParser{}
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// NewHTMLBlockParser return a new BlockParser that can parse html
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// blocks.
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func NewHTMLBlockParser() BlockParser {
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return defaultHTMLBlockParser
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}
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func (b *htmlBlockParser) Trigger() []byte {
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return []byte{'<'}
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}
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func (b *htmlBlockParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
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var node *ast.HTMLBlock
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line, segment := reader.PeekLine()
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last := pc.LastOpenedBlock().Node
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if pos := pc.BlockOffset(); pos < 0 || line[pos] != '<' {
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return nil, NoChildren
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}
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if m := htmlBlockType1OpenRegexp.FindSubmatchIndex(line); m != nil {
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node = ast.NewHTMLBlock(ast.HTMLBlockType1)
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} else if htmlBlockType2OpenRegexp.Match(line) {
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node = ast.NewHTMLBlock(ast.HTMLBlockType2)
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} else if htmlBlockType3OpenRegexp.Match(line) {
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node = ast.NewHTMLBlock(ast.HTMLBlockType3)
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} else if htmlBlockType4OpenRegexp.Match(line) {
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node = ast.NewHTMLBlock(ast.HTMLBlockType4)
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} else if htmlBlockType5OpenRegexp.Match(line) {
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node = ast.NewHTMLBlock(ast.HTMLBlockType5)
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} else if match := htmlBlockType7Regexp.FindSubmatchIndex(line); match != nil {
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isCloseTag := match[2] > -1 && bytes.Equal(line[match[2]:match[3]], []byte("/"))
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hasAttr := match[6] != match[7]
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tagName := strings.ToLower(string(line[match[4]:match[5]]))
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_, ok := allowedBlockTags[tagName]
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if ok {
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node = ast.NewHTMLBlock(ast.HTMLBlockType6)
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} else if tagName != "script" && tagName != "style" && tagName != "pre" && !ast.IsParagraph(last) && !(isCloseTag && hasAttr) { // type 7 can not interrupt paragraph
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node = ast.NewHTMLBlock(ast.HTMLBlockType7)
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}
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}
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if node == nil {
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if match := htmlBlockType6Regexp.FindSubmatchIndex(line); match != nil {
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tagName := string(line[match[2]:match[3]])
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_, ok := allowedBlockTags[strings.ToLower(tagName)]
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if ok {
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node = ast.NewHTMLBlock(ast.HTMLBlockType6)
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}
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}
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}
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if node != nil {
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reader.Advance(segment.Len() - 1)
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node.Lines().Append(segment)
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return node, NoChildren
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}
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return nil, NoChildren
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}
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func (b *htmlBlockParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
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htmlBlock := node.(*ast.HTMLBlock)
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lines := htmlBlock.Lines()
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line, segment := reader.PeekLine()
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var closurePattern []byte
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switch htmlBlock.HTMLBlockType {
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case ast.HTMLBlockType1:
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if lines.Len() == 1 {
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firstLine := lines.At(0)
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if htmlBlockType1CloseRegexp.Match(firstLine.Value(reader.Source())) {
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return Close
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}
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}
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if htmlBlockType1CloseRegexp.Match(line) {
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htmlBlock.ClosureLine = segment
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reader.Advance(segment.Len() - 1)
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return Close
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}
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case ast.HTMLBlockType2:
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closurePattern = htmlBlockType2Close
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fallthrough
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case ast.HTMLBlockType3:
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if closurePattern == nil {
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closurePattern = htmlBlockType3Close
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}
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fallthrough
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case ast.HTMLBlockType4:
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if closurePattern == nil {
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closurePattern = htmlBlockType4Close
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}
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fallthrough
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case ast.HTMLBlockType5:
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if closurePattern == nil {
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closurePattern = htmlBlockType5Close
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}
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if lines.Len() == 1 {
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firstLine := lines.At(0)
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if bytes.Contains(firstLine.Value(reader.Source()), closurePattern) {
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return Close
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}
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}
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if bytes.Contains(line, closurePattern) {
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htmlBlock.ClosureLine = segment
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reader.Advance(segment.Len() - 1)
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return Close
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}
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case ast.HTMLBlockType6, ast.HTMLBlockType7:
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if util.IsBlank(line) {
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return Close
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}
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}
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node.Lines().Append(segment)
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reader.Advance(segment.Len() - 1)
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return Continue | NoChildren
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}
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func (b *htmlBlockParser) Close(node ast.Node, reader text.Reader, pc Context) {
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// nothing to do
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}
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func (b *htmlBlockParser) CanInterruptParagraph() bool {
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return true
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}
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func (b *htmlBlockParser) CanAcceptIndentedLine() bool {
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return false
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}
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