// Copyright 2024 The Gitea Authors. All rights reserved. // SPDX-License-Identifier: MIT package markup import ( "html/template" "net/url" "regexp" "strconv" "strings" "code.gitea.io/gitea/modules/httplib" "code.gitea.io/gitea/modules/log" "golang.org/x/net/html" ) // codePreviewPattern matches "http://domain/.../{owner}/{repo}/src/commit/{commit}/{filepath}#L10-L20" var codePreviewPattern = regexp.MustCompile(`https?://\S+/([^\s/]+)/([^\s/]+)/src/commit/([0-9a-f]{7,64})(/\S+)#(L\d+(-L\d+)?)`) type RenderCodePreviewOptions struct { FullURL string OwnerName string RepoName string CommitID string FilePath string LineStart, LineStop int } func renderCodeBlock(ctx *RenderContext, node *html.Node) (urlPosStart, urlPosStop int, htm template.HTML, err error) { m := codePreviewPattern.FindStringSubmatchIndex(node.Data) if m == nil { return 0, 0, "", nil } opts := RenderCodePreviewOptions{ FullURL: node.Data[m[0]:m[1]], OwnerName: node.Data[m[2]:m[3]], RepoName: node.Data[m[4]:m[5]], CommitID: node.Data[m[6]:m[7]], FilePath: node.Data[m[8]:m[9]], } if !httplib.IsCurrentGiteaSiteURL(ctx.Ctx, opts.FullURL) { return 0, 0, "", nil } u, err := url.Parse(opts.FilePath) if err != nil { return 0, 0, "", err } opts.FilePath = strings.TrimPrefix(u.Path, "/") lineStartStr, lineStopStr, _ := strings.Cut(node.Data[m[10]:m[11]], "-") lineStart, _ := strconv.Atoi(strings.TrimPrefix(lineStartStr, "L")) lineStop, _ := strconv.Atoi(strings.TrimPrefix(lineStopStr, "L")) opts.LineStart, opts.LineStop = lineStart, lineStop h, err := DefaultProcessorHelper.RenderRepoFileCodePreview(ctx.Ctx, opts) return m[0], m[1], h, err } func codePreviewPatternProcessor(ctx *RenderContext, node *html.Node) { nodeStop := node.NextSibling for node != nodeStop { if node.Type != html.TextNode { node = node.NextSibling continue } urlPosStart, urlPosEnd, h, err := renderCodeBlock(ctx, node) if err != nil || h == "" { if err != nil { log.Error("Unable to render code preview: %v", err) } node = node.NextSibling continue } next := node.NextSibling textBefore := node.Data[:urlPosStart] textAfter := node.Data[urlPosEnd:] // "textBefore" could be empty if there is only a URL in the text node, then an empty node (p, or li) will be left here. // However, the empty node can't be simply removed, because: // 1. the following processors will still try to access it (need to double-check undefined behaviors) // 2. the new node is inserted as "

{TextBefore}

{TextAfter}

" (the parent could also be "li") // then it is resolved as: "

{TextBefore}

{TextAfter}

", // so unless it could correctly replace the parent "p/li" node, it is very difficult to eliminate the "TextBefore" empty node. node.Data = textBefore node.Parent.InsertBefore(&html.Node{Type: html.RawNode, Data: string(h)}, next) if textAfter != "" { node.Parent.InsertBefore(&html.Node{Type: html.TextNode, Data: textAfter}, next) } node = next } }