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// Copyright 2014 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package markdown
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import (
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	"bytes"
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	"fmt"
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	"io"
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	"net/url"
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	"path"
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	"path/filepath"
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	"regexp"
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	"strings"
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	"github.com/Unknwon/com"
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	"github.com/russross/blackfriday"
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	"golang.org/x/net/html"
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	"code.gitea.io/gitea/modules/base"
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	"code.gitea.io/gitea/modules/markup"
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	"code.gitea.io/gitea/modules/setting"
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)
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// Issue name styles
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const (
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	IssueNameStyleNumeric      = "numeric"
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	IssueNameStyleAlphanumeric = "alphanumeric"
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)
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// IsMarkdownFile reports whether name looks like a Markdown file
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// based on its extension.
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func IsMarkdownFile(name string) bool {
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	extension := strings.ToLower(filepath.Ext(name))
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	for _, ext := range setting.Markdown.FileExtensions {
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		if strings.ToLower(ext) == extension {
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			return true
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		}
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	}
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	return false
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}
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var (
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	// MentionPattern matches string that mentions someone, e.g. @Unknwon
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	MentionPattern = regexp.MustCompile(`(\s|^|\W)@[0-9a-zA-Z-_\.]+`)
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	// IssueNumericPattern matches string that references to a numeric issue, e.g. #1287
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	IssueNumericPattern = regexp.MustCompile(`( |^|\()#[0-9]+\b`)
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	// IssueAlphanumericPattern matches string that references to an alphanumeric issue, e.g. ABC-1234
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	IssueAlphanumericPattern = regexp.MustCompile(`( |^|\()[A-Z]{1,10}-[1-9][0-9]*\b`)
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	// CrossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository
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	// e.g. gogits/gogs#12345
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	CrossReferenceIssueNumericPattern = regexp.MustCompile(`( |^)[0-9a-zA-Z]+/[0-9a-zA-Z]+#[0-9]+\b`)
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	// Sha1CurrentPattern matches string that represents a commit SHA, e.g. d8a994ef243349f321568f9e36d5c3f444b99cae
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	// FIXME: this pattern matches pure numbers as well, right now we do a hack to check in renderSha1CurrentPattern
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	// by converting string to a number.
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	Sha1CurrentPattern = regexp.MustCompile(`(?:^|\s|\()[0-9a-f]{40}\b`)
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	// ShortLinkPattern matches short but difficult to parse [[name|link|arg=test]] syntax
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	ShortLinkPattern = regexp.MustCompile(`(\[\[.*\]\]\w*)`)
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	// AnySHA1Pattern allows to split url containing SHA into parts
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	AnySHA1Pattern = regexp.MustCompile(`(http\S*)://(\S+)/(\S+)/(\S+)/(\S+)/([0-9a-f]{40})(?:/?([^#\s]+)?(?:#(\S+))?)?`)
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	// IssueFullPattern allows to split issue (and pull) URLs into parts
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	IssueFullPattern = regexp.MustCompile(`(?:^|\s|\()(http\S*)://((?:[^\s/]+/)+)((?:\w{1,10}-)?[1-9][0-9]*)([\?|#]\S+.(\S+)?)?\b`)
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	validLinksPattern = regexp.MustCompile(`^[a-z][\w-]+://`)
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)
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// isLink reports whether link fits valid format.
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func isLink(link []byte) bool {
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	return validLinksPattern.Match(link)
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}
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// FindAllMentions matches mention patterns in given content
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// and returns a list of found user names without @ prefix.
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func FindAllMentions(content string) []string {
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	mentions := MentionPattern.FindAllString(content, -1)
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	for i := range mentions {
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		mentions[i] = mentions[i][strings.Index(mentions[i], "@")+1:] // Strip @ character
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	}
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	return mentions
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}
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// Renderer is a extended version of underlying render object.
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type Renderer struct {
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	blackfriday.Renderer
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	urlPrefix      string
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	isWikiMarkdown bool
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}
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// Link defines how formal links should be processed to produce corresponding HTML elements.
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func (r *Renderer) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
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	if len(link) > 0 && !isLink(link) {
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		if link[0] != '#' {
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			lnk := string(link)
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			if r.isWikiMarkdown {
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				lnk = URLJoin("wiki", lnk)
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			}
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			mLink := URLJoin(r.urlPrefix, lnk)
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			link = []byte(mLink)
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		}
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	}
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	r.Renderer.Link(out, link, title, content)
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}
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// List renders markdown bullet or digit lists to HTML
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func (r *Renderer) List(out *bytes.Buffer, text func() bool, flags int) {
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	marker := out.Len()
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	if out.Len() > 0 {
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		out.WriteByte('\n')
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	}
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	if flags&blackfriday.LIST_TYPE_DEFINITION != 0 {
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		out.WriteString("<dl>")
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	} else if flags&blackfriday.LIST_TYPE_ORDERED != 0 {
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		out.WriteString("<ol class='ui list'>")
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	} else {
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		out.WriteString("<ul class='ui list'>")
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	}
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	if !text() {
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		out.Truncate(marker)
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		return
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	}
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	if flags&blackfriday.LIST_TYPE_DEFINITION != 0 {
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		out.WriteString("</dl>\n")
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	} else if flags&blackfriday.LIST_TYPE_ORDERED != 0 {
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		out.WriteString("</ol>\n")
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	} else {
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		out.WriteString("</ul>\n")
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	}
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}
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// ListItem defines how list items should be processed to produce corresponding HTML elements.
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func (r *Renderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
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	// Detect procedures to draw checkboxes.
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	prefix := ""
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	if bytes.HasPrefix(text, []byte("<p>")) {
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		prefix = "<p>"
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	}
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	switch {
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	case bytes.HasPrefix(text, []byte(prefix+"[ ] ")):
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		text = append([]byte(`<div class="ui fitted disabled checkbox"><input type="checkbox" disabled="disabled" /><label /></div>`), text[3+len(prefix):]...)
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		if prefix != "" {
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			text = bytes.Replace(text, []byte(prefix), []byte{}, 1)
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		}
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	case bytes.HasPrefix(text, []byte(prefix+"[x] ")):
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		text = append([]byte(`<div class="ui checked fitted disabled checkbox"><input type="checkbox" checked="" disabled="disabled" /><label /></div>`), text[3+len(prefix):]...)
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		if prefix != "" {
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			text = bytes.Replace(text, []byte(prefix), []byte{}, 1)
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		}
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	}
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	r.Renderer.ListItem(out, text, flags)
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}
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// Note: this section is for purpose of increase performance and
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// reduce memory allocation at runtime since they are constant literals.
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var (
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	svgSuffix         = []byte(".svg")
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	svgSuffixWithMark = []byte(".svg?")
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)
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// Image defines how images should be processed to produce corresponding HTML elements.
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func (r *Renderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
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	prefix := r.urlPrefix
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	if r.isWikiMarkdown {
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		prefix = URLJoin(prefix, "wiki", "src")
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	}
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	prefix = strings.Replace(prefix, "/src/", "/raw/", 1)
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	if len(link) > 0 {
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		if isLink(link) {
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			// External link with .svg suffix usually means CI status.
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			// TODO: define a keyword to allow non-svg images render as external link.
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			if bytes.HasSuffix(link, svgSuffix) || bytes.Contains(link, svgSuffixWithMark) {
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				r.Renderer.Image(out, link, title, alt)
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				return
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			}
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		} else {
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			lnk := string(link)
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			lnk = URLJoin(prefix, lnk)
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			lnk = strings.Replace(lnk, " ", "+", -1)
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			link = []byte(lnk)
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		}
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	}
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	out.WriteString(`<a href="`)
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	out.Write(link)
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	out.WriteString(`">`)
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	r.Renderer.Image(out, link, title, alt)
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	out.WriteString("</a>")
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}
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// cutoutVerbosePrefix cutouts URL prefix including sub-path to
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// return a clean unified string of request URL path.
 | 
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func cutoutVerbosePrefix(prefix string) string {
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	if len(prefix) == 0 || prefix[0] != '/' {
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		return prefix
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	}
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	count := 0
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	for i := 0; i < len(prefix); i++ {
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		if prefix[i] == '/' {
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			count++
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		}
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		if count >= 3+setting.AppSubURLDepth {
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			return prefix[:i]
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		}
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	}
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	return prefix
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}
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// URLJoin joins url components, like path.Join, but preserving contents
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func URLJoin(elem ...string) string {
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	res := ""
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	last := len(elem) - 1
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	for i, item := range elem {
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		res += item
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		if i != last && !strings.HasSuffix(res, "/") {
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			res += "/"
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		}
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	}
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	cwdIndex := strings.Index(res, "/./")
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	for cwdIndex != -1 {
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		res = strings.Replace(res, "/./", "/", 1)
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		cwdIndex = strings.Index(res, "/./")
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	}
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	upIndex := strings.Index(res, "/..")
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	for upIndex != -1 {
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		res = strings.Replace(res, "/..", "", 1)
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		prevStart := -1
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		for i := upIndex - 1; i >= 0; i-- {
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			if res[i] == '/' {
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				prevStart = i
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				break
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			}
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		}
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		if prevStart != -1 {
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			res = res[:prevStart] + res[upIndex:]
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		}
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		upIndex = strings.Index(res, "/..")
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	}
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	return res
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}
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// RenderIssueIndexPattern renders issue indexes to corresponding links.
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func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
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	urlPrefix = cutoutVerbosePrefix(urlPrefix)
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	pattern := IssueNumericPattern
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	if metas["style"] == IssueNameStyleAlphanumeric {
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		pattern = IssueAlphanumericPattern
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	}
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	ms := pattern.FindAll(rawBytes, -1)
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	for _, m := range ms {
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		if m[0] == ' ' || m[0] == '(' {
 | 
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			m = m[1:] // ignore leading space or opening parentheses
 | 
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		}
 | 
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		var link string
 | 
						|
		if metas == nil {
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			link = fmt.Sprintf(`<a href="%s">%s</a>`, URLJoin(urlPrefix, "issues", string(m[1:])), m)
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		} else {
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			// Support for external issue tracker
 | 
						|
			if metas["style"] == IssueNameStyleAlphanumeric {
 | 
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				metas["index"] = string(m)
 | 
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			} else {
 | 
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				metas["index"] = string(m[1:])
 | 
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			}
 | 
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			link = fmt.Sprintf(`<a href="%s">%s</a>`, com.Expand(metas["format"], metas), m)
 | 
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		}
 | 
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		rawBytes = bytes.Replace(rawBytes, m, []byte(link), 1)
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	}
 | 
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	return rawBytes
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}
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// IsSameDomain checks if given url string has the same hostname as current Gitea instance
 | 
						|
func IsSameDomain(s string) bool {
 | 
						|
	if strings.HasPrefix(s, "/") {
 | 
						|
		return true
 | 
						|
	}
 | 
						|
	if uapp, err := url.Parse(setting.AppURL); err == nil {
 | 
						|
		if u, err := url.Parse(s); err == nil {
 | 
						|
			return u.Host == uapp.Host
 | 
						|
		}
 | 
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		return false
 | 
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	}
 | 
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	return false
 | 
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}
 | 
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 | 
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// renderFullSha1Pattern renders SHA containing URLs
 | 
						|
func renderFullSha1Pattern(rawBytes []byte, urlPrefix string) []byte {
 | 
						|
	ms := AnySHA1Pattern.FindAllSubmatch(rawBytes, -1)
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						|
	for _, m := range ms {
 | 
						|
		all := m[0]
 | 
						|
		protocol := string(m[1])
 | 
						|
		paths := string(m[2])
 | 
						|
		path := protocol + "://" + paths
 | 
						|
		author := string(m[3])
 | 
						|
		repoName := string(m[4])
 | 
						|
		path = URLJoin(path, author, repoName)
 | 
						|
		ltype := "src"
 | 
						|
		itemType := m[5]
 | 
						|
		if IsSameDomain(paths) {
 | 
						|
			ltype = string(itemType)
 | 
						|
		} else if string(itemType) == "commit" {
 | 
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			ltype = "commit"
 | 
						|
		}
 | 
						|
		sha := m[6]
 | 
						|
		var subtree string
 | 
						|
		if len(m) > 7 && len(m[7]) > 0 {
 | 
						|
			subtree = string(m[7])
 | 
						|
		}
 | 
						|
		var line []byte
 | 
						|
		if len(m) > 8 && len(m[8]) > 0 {
 | 
						|
			line = m[8]
 | 
						|
		}
 | 
						|
		urlSuffix := ""
 | 
						|
		text := base.ShortSha(string(sha))
 | 
						|
		if subtree != "" {
 | 
						|
			urlSuffix = "/" + subtree
 | 
						|
			text += urlSuffix
 | 
						|
		}
 | 
						|
		if line != nil {
 | 
						|
			value := string(line)
 | 
						|
			urlSuffix += "#"
 | 
						|
			urlSuffix += value
 | 
						|
			text += " ("
 | 
						|
			text += value
 | 
						|
			text += ")"
 | 
						|
		}
 | 
						|
		rawBytes = bytes.Replace(rawBytes, all, []byte(fmt.Sprintf(
 | 
						|
			`<a href="%s">%s</a>`, URLJoin(path, ltype, string(sha))+urlSuffix, text)), -1)
 | 
						|
	}
 | 
						|
	return rawBytes
 | 
						|
}
 | 
						|
 | 
						|
// renderFullIssuePattern renders issues-like URLs
 | 
						|
func renderFullIssuePattern(rawBytes []byte, urlPrefix string) []byte {
 | 
						|
	ms := IssueFullPattern.FindAllSubmatch(rawBytes, -1)
 | 
						|
	for _, m := range ms {
 | 
						|
		all := m[0]
 | 
						|
		protocol := string(m[1])
 | 
						|
		paths := bytes.Split(m[2], []byte("/"))
 | 
						|
		paths = paths[:len(paths)-1]
 | 
						|
		if bytes.HasPrefix(paths[0], []byte("gist.")) {
 | 
						|
			continue
 | 
						|
		}
 | 
						|
		path := protocol + "://" + string(m[2])
 | 
						|
		id := string(m[3])
 | 
						|
		path = URLJoin(path, id)
 | 
						|
		var comment []byte
 | 
						|
		if len(m) > 3 {
 | 
						|
			comment = m[4]
 | 
						|
		}
 | 
						|
		urlSuffix := ""
 | 
						|
		text := "#" + id
 | 
						|
		if comment != nil {
 | 
						|
			urlSuffix += string(comment)
 | 
						|
			text += " <i class='comment icon'></i>"
 | 
						|
		}
 | 
						|
		rawBytes = bytes.Replace(rawBytes, all, []byte(fmt.Sprintf(
 | 
						|
			`<a href="%s%s">%s</a>`, path, urlSuffix, text)), -1)
 | 
						|
	}
 | 
						|
	return rawBytes
 | 
						|
}
 | 
						|
 | 
						|
func firstIndexOfByte(sl []byte, target byte) int {
 | 
						|
	for i := 0; i < len(sl); i++ {
 | 
						|
		if sl[i] == target {
 | 
						|
			return i
 | 
						|
		}
 | 
						|
	}
 | 
						|
	return -1
 | 
						|
}
 | 
						|
 | 
						|
func lastIndexOfByte(sl []byte, target byte) int {
 | 
						|
	for i := len(sl) - 1; i >= 0; i-- {
 | 
						|
		if sl[i] == target {
 | 
						|
			return i
 | 
						|
		}
 | 
						|
	}
 | 
						|
	return -1
 | 
						|
}
 | 
						|
 | 
						|
// RenderShortLinks processes [[syntax]]
 | 
						|
//
 | 
						|
// noLink flag disables making link tags when set to true
 | 
						|
// so this function just replaces the whole [[...]] with the content text
 | 
						|
//
 | 
						|
// isWikiMarkdown is a flag to choose linking url prefix
 | 
						|
func RenderShortLinks(rawBytes []byte, urlPrefix string, noLink bool, isWikiMarkdown bool) []byte {
 | 
						|
	ms := ShortLinkPattern.FindAll(rawBytes, -1)
 | 
						|
	for _, m := range ms {
 | 
						|
		orig := bytes.TrimSpace(m)
 | 
						|
		m = orig[2:]
 | 
						|
		tailPos := lastIndexOfByte(m, ']') + 1
 | 
						|
		tail := []byte{}
 | 
						|
		if tailPos < len(m) {
 | 
						|
			tail = m[tailPos:]
 | 
						|
			m = m[:tailPos-1]
 | 
						|
		}
 | 
						|
		m = m[:len(m)-2]
 | 
						|
		props := map[string]string{}
 | 
						|
 | 
						|
		// MediaWiki uses [[link|text]], while GitHub uses [[text|link]]
 | 
						|
		// It makes page handling terrible, but we prefer GitHub syntax
 | 
						|
		// And fall back to MediaWiki only when it is obvious from the look
 | 
						|
		// Of text and link contents
 | 
						|
		sl := bytes.Split(m, []byte("|"))
 | 
						|
		for _, v := range sl {
 | 
						|
			switch bytes.Count(v, []byte("=")) {
 | 
						|
 | 
						|
			// Piped args without = sign, these are mandatory arguments
 | 
						|
			case 0:
 | 
						|
				{
 | 
						|
					sv := string(v)
 | 
						|
					if props["name"] == "" {
 | 
						|
						if isLink(v) {
 | 
						|
							// If we clearly see it is a link, we save it so
 | 
						|
 | 
						|
							// But first we need to ensure, that if both mandatory args provided
 | 
						|
							// look like links, we stick to GitHub syntax
 | 
						|
							if props["link"] != "" {
 | 
						|
								props["name"] = props["link"]
 | 
						|
							}
 | 
						|
 | 
						|
							props["link"] = strings.TrimSpace(sv)
 | 
						|
						} else {
 | 
						|
							props["name"] = sv
 | 
						|
						}
 | 
						|
					} else {
 | 
						|
						props["link"] = strings.TrimSpace(sv)
 | 
						|
					}
 | 
						|
				}
 | 
						|
 | 
						|
			// Piped args with = sign, these are optional arguments
 | 
						|
			case 1:
 | 
						|
				{
 | 
						|
					sep := firstIndexOfByte(v, '=')
 | 
						|
					key, val := string(v[:sep]), html.UnescapeString(string(v[sep+1:]))
 | 
						|
					lastCharIndex := len(val) - 1
 | 
						|
					if (val[0] == '"' || val[0] == '\'') && (val[lastCharIndex] == '"' || val[lastCharIndex] == '\'') {
 | 
						|
						val = val[1:lastCharIndex]
 | 
						|
					}
 | 
						|
					props[key] = val
 | 
						|
				}
 | 
						|
			}
 | 
						|
		}
 | 
						|
 | 
						|
		var name string
 | 
						|
		var link string
 | 
						|
		if props["link"] != "" {
 | 
						|
			link = props["link"]
 | 
						|
		} else if props["name"] != "" {
 | 
						|
			link = props["name"]
 | 
						|
		}
 | 
						|
		if props["title"] != "" {
 | 
						|
			name = props["title"]
 | 
						|
		} else if props["name"] != "" {
 | 
						|
			name = props["name"]
 | 
						|
		} else {
 | 
						|
			name = link
 | 
						|
		}
 | 
						|
 | 
						|
		name += string(tail)
 | 
						|
		image := false
 | 
						|
		ext := filepath.Ext(string(link))
 | 
						|
		if ext != "" {
 | 
						|
			switch ext {
 | 
						|
			case ".jpg", ".jpeg", ".png", ".tif", ".tiff", ".webp", ".gif", ".bmp", ".ico", ".svg":
 | 
						|
				{
 | 
						|
					image = true
 | 
						|
				}
 | 
						|
			}
 | 
						|
		}
 | 
						|
		absoluteLink := isLink([]byte(link))
 | 
						|
		if !absoluteLink {
 | 
						|
			link = strings.Replace(link, " ", "+", -1)
 | 
						|
		}
 | 
						|
		if image {
 | 
						|
			if !absoluteLink {
 | 
						|
				if IsSameDomain(urlPrefix) {
 | 
						|
					urlPrefix = strings.Replace(urlPrefix, "/src/", "/raw/", 1)
 | 
						|
				}
 | 
						|
				if isWikiMarkdown {
 | 
						|
					link = URLJoin("wiki", "raw", link)
 | 
						|
				}
 | 
						|
				link = URLJoin(urlPrefix, link)
 | 
						|
			}
 | 
						|
			title := props["title"]
 | 
						|
			if title == "" {
 | 
						|
				title = props["alt"]
 | 
						|
			}
 | 
						|
			if title == "" {
 | 
						|
				title = path.Base(string(name))
 | 
						|
			}
 | 
						|
			alt := props["alt"]
 | 
						|
			if alt == "" {
 | 
						|
				alt = name
 | 
						|
			}
 | 
						|
			if alt != "" {
 | 
						|
				alt = `alt="` + alt + `"`
 | 
						|
			}
 | 
						|
			name = fmt.Sprintf(`<img src="%s" %s title="%s" />`, link, alt, title)
 | 
						|
		} else if !absoluteLink {
 | 
						|
			if isWikiMarkdown {
 | 
						|
				link = URLJoin("wiki", link)
 | 
						|
			}
 | 
						|
			link = URLJoin(urlPrefix, link)
 | 
						|
		}
 | 
						|
		if noLink {
 | 
						|
			rawBytes = bytes.Replace(rawBytes, orig, []byte(name), -1)
 | 
						|
		} else {
 | 
						|
			rawBytes = bytes.Replace(rawBytes, orig,
 | 
						|
				[]byte(fmt.Sprintf(`<a href="%s">%s</a>`, link, name)), -1)
 | 
						|
		}
 | 
						|
	}
 | 
						|
	return rawBytes
 | 
						|
}
 | 
						|
 | 
						|
// RenderCrossReferenceIssueIndexPattern renders issue indexes from other repositories to corresponding links.
 | 
						|
func RenderCrossReferenceIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
 | 
						|
	ms := CrossReferenceIssueNumericPattern.FindAll(rawBytes, -1)
 | 
						|
	for _, m := range ms {
 | 
						|
		if m[0] == ' ' || m[0] == '(' {
 | 
						|
			m = m[1:] // ignore leading space or opening parentheses
 | 
						|
		}
 | 
						|
 | 
						|
		repo := string(bytes.Split(m, []byte("#"))[0])
 | 
						|
		issue := string(bytes.Split(m, []byte("#"))[1])
 | 
						|
 | 
						|
		link := fmt.Sprintf(`<a href="%s">%s</a>`, URLJoin(setting.AppURL, repo, "issues", issue), m)
 | 
						|
		rawBytes = bytes.Replace(rawBytes, m, []byte(link), 1)
 | 
						|
	}
 | 
						|
	return rawBytes
 | 
						|
}
 | 
						|
 | 
						|
// renderSha1CurrentPattern renders SHA1 strings to corresponding links that assumes in the same repository.
 | 
						|
func renderSha1CurrentPattern(rawBytes []byte, urlPrefix string) []byte {
 | 
						|
	ms := Sha1CurrentPattern.FindAllSubmatch(rawBytes, -1)
 | 
						|
	for _, m := range ms {
 | 
						|
		all := m[0]
 | 
						|
		if com.StrTo(all).MustInt() > 0 {
 | 
						|
			continue
 | 
						|
		}
 | 
						|
		rawBytes = bytes.Replace(rawBytes, all, []byte(fmt.Sprintf(
 | 
						|
			`<a href="%s">%s</a>`, URLJoin(urlPrefix, "commit", string(all)), base.ShortSha(string(all)))), -1)
 | 
						|
	}
 | 
						|
	return rawBytes
 | 
						|
}
 | 
						|
 | 
						|
// RenderSpecialLink renders mentions, indexes and SHA1 strings to corresponding links.
 | 
						|
func RenderSpecialLink(rawBytes []byte, urlPrefix string, metas map[string]string, isWikiMarkdown bool) []byte {
 | 
						|
	ms := MentionPattern.FindAll(rawBytes, -1)
 | 
						|
	for _, m := range ms {
 | 
						|
		m = m[bytes.Index(m, []byte("@")):]
 | 
						|
		rawBytes = bytes.Replace(rawBytes, m,
 | 
						|
			[]byte(fmt.Sprintf(`<a href="%s">%s</a>`, URLJoin(setting.AppURL, string(m[1:])), m)), -1)
 | 
						|
	}
 | 
						|
 | 
						|
	rawBytes = RenderShortLinks(rawBytes, urlPrefix, false, isWikiMarkdown)
 | 
						|
	rawBytes = RenderIssueIndexPattern(rawBytes, urlPrefix, metas)
 | 
						|
	rawBytes = RenderCrossReferenceIssueIndexPattern(rawBytes, urlPrefix, metas)
 | 
						|
	rawBytes = renderFullSha1Pattern(rawBytes, urlPrefix)
 | 
						|
	rawBytes = renderSha1CurrentPattern(rawBytes, urlPrefix)
 | 
						|
	rawBytes = renderFullIssuePattern(rawBytes, urlPrefix)
 | 
						|
	return rawBytes
 | 
						|
}
 | 
						|
 | 
						|
// RenderRaw renders Markdown to HTML without handling special links.
 | 
						|
func RenderRaw(body []byte, urlPrefix string, wikiMarkdown bool) []byte {
 | 
						|
	htmlFlags := 0
 | 
						|
	htmlFlags |= blackfriday.HTML_SKIP_STYLE
 | 
						|
	htmlFlags |= blackfriday.HTML_OMIT_CONTENTS
 | 
						|
	renderer := &Renderer{
 | 
						|
		Renderer:       blackfriday.HtmlRenderer(htmlFlags, "", ""),
 | 
						|
		urlPrefix:      urlPrefix,
 | 
						|
		isWikiMarkdown: wikiMarkdown,
 | 
						|
	}
 | 
						|
 | 
						|
	// set up the parser
 | 
						|
	extensions := 0
 | 
						|
	extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS
 | 
						|
	extensions |= blackfriday.EXTENSION_TABLES
 | 
						|
	extensions |= blackfriday.EXTENSION_FENCED_CODE
 | 
						|
	extensions |= blackfriday.EXTENSION_STRIKETHROUGH
 | 
						|
	extensions |= blackfriday.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
 | 
						|
 | 
						|
	if setting.Markdown.EnableHardLineBreak {
 | 
						|
		extensions |= blackfriday.EXTENSION_HARD_LINE_BREAK
 | 
						|
	}
 | 
						|
 | 
						|
	body = blackfriday.Markdown(body, renderer, extensions)
 | 
						|
	return body
 | 
						|
}
 | 
						|
 | 
						|
var (
 | 
						|
	leftAngleBracket  = []byte("</")
 | 
						|
	rightAngleBracket = []byte(">")
 | 
						|
)
 | 
						|
 | 
						|
var noEndTags = []string{"img", "input", "br", "hr"}
 | 
						|
 | 
						|
// PostProcess treats different types of HTML differently,
 | 
						|
// and only renders special links for plain text blocks.
 | 
						|
func PostProcess(rawHTML []byte, urlPrefix string, metas map[string]string, isWikiMarkdown bool) []byte {
 | 
						|
	startTags := make([]string, 0, 5)
 | 
						|
	var buf bytes.Buffer
 | 
						|
	tokenizer := html.NewTokenizer(bytes.NewReader(rawHTML))
 | 
						|
 | 
						|
OUTER_LOOP:
 | 
						|
	for html.ErrorToken != tokenizer.Next() {
 | 
						|
		token := tokenizer.Token()
 | 
						|
		switch token.Type {
 | 
						|
		case html.TextToken:
 | 
						|
			buf.Write(RenderSpecialLink([]byte(token.String()), urlPrefix, metas, isWikiMarkdown))
 | 
						|
 | 
						|
		case html.StartTagToken:
 | 
						|
			buf.WriteString(token.String())
 | 
						|
			tagName := token.Data
 | 
						|
			// If this is an excluded tag, we skip processing all output until a close tag is encountered.
 | 
						|
			if strings.EqualFold("a", tagName) || strings.EqualFold("code", tagName) || strings.EqualFold("pre", tagName) {
 | 
						|
				stackNum := 1
 | 
						|
				for html.ErrorToken != tokenizer.Next() {
 | 
						|
					token = tokenizer.Token()
 | 
						|
 | 
						|
					// Copy the token to the output verbatim
 | 
						|
					buf.Write(RenderShortLinks([]byte(token.String()), urlPrefix, true, isWikiMarkdown))
 | 
						|
 | 
						|
					if token.Type == html.StartTagToken && !com.IsSliceContainsStr(noEndTags, token.Data) {
 | 
						|
						stackNum++
 | 
						|
					}
 | 
						|
 | 
						|
					// If this is the close tag to the outer-most, we are done
 | 
						|
					if token.Type == html.EndTagToken {
 | 
						|
						stackNum--
 | 
						|
 | 
						|
						if stackNum <= 0 && strings.EqualFold(tagName, token.Data) {
 | 
						|
							break
 | 
						|
						}
 | 
						|
					}
 | 
						|
				}
 | 
						|
				continue OUTER_LOOP
 | 
						|
			}
 | 
						|
 | 
						|
			if !com.IsSliceContainsStr(noEndTags, tagName) {
 | 
						|
				startTags = append(startTags, tagName)
 | 
						|
			}
 | 
						|
 | 
						|
		case html.EndTagToken:
 | 
						|
			if len(startTags) == 0 {
 | 
						|
				buf.WriteString(token.String())
 | 
						|
				break
 | 
						|
			}
 | 
						|
 | 
						|
			buf.Write(leftAngleBracket)
 | 
						|
			buf.WriteString(startTags[len(startTags)-1])
 | 
						|
			buf.Write(rightAngleBracket)
 | 
						|
			startTags = startTags[:len(startTags)-1]
 | 
						|
		default:
 | 
						|
			buf.WriteString(token.String())
 | 
						|
		}
 | 
						|
	}
 | 
						|
 | 
						|
	if io.EOF == tokenizer.Err() {
 | 
						|
		return buf.Bytes()
 | 
						|
	}
 | 
						|
 | 
						|
	// If we are not at the end of the input, then some other parsing error has occurred,
 | 
						|
	// so return the input verbatim.
 | 
						|
	return rawHTML
 | 
						|
}
 | 
						|
 | 
						|
// Render renders Markdown to HTML with all specific handling stuff.
 | 
						|
func render(rawBytes []byte, urlPrefix string, metas map[string]string, isWikiMarkdown bool) []byte {
 | 
						|
	urlPrefix = strings.Replace(urlPrefix, " ", "+", -1)
 | 
						|
	result := RenderRaw(rawBytes, urlPrefix, isWikiMarkdown)
 | 
						|
	result = PostProcess(result, urlPrefix, metas, isWikiMarkdown)
 | 
						|
	result = SanitizeBytes(result)
 | 
						|
	return result
 | 
						|
}
 | 
						|
 | 
						|
// Render renders Markdown to HTML with all specific handling stuff.
 | 
						|
func Render(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
 | 
						|
	return render(rawBytes, urlPrefix, metas, false)
 | 
						|
}
 | 
						|
 | 
						|
// RenderString renders Markdown to HTML with special links and returns string type.
 | 
						|
func RenderString(raw, urlPrefix string, metas map[string]string) string {
 | 
						|
	return string(render([]byte(raw), urlPrefix, metas, false))
 | 
						|
}
 | 
						|
 | 
						|
// RenderWiki renders markdown wiki page to HTML and return HTML string
 | 
						|
func RenderWiki(rawBytes []byte, urlPrefix string, metas map[string]string) string {
 | 
						|
	return string(render(rawBytes, urlPrefix, metas, true))
 | 
						|
}
 | 
						|
 | 
						|
var (
 | 
						|
	// MarkupName describes markup's name
 | 
						|
	MarkupName = "markdown"
 | 
						|
)
 | 
						|
 | 
						|
func init() {
 | 
						|
	markup.RegisterParser(Parser{})
 | 
						|
}
 | 
						|
 | 
						|
// Parser implements markup.Parser
 | 
						|
type Parser struct {
 | 
						|
}
 | 
						|
 | 
						|
// Name implements markup.Parser
 | 
						|
func (Parser) Name() string {
 | 
						|
	return MarkupName
 | 
						|
}
 | 
						|
 | 
						|
// Extensions implements markup.Parser
 | 
						|
func (Parser) Extensions() []string {
 | 
						|
	return setting.Markdown.FileExtensions
 | 
						|
}
 | 
						|
 | 
						|
// Render implements markup.Parser
 | 
						|
func (Parser) Render(rawBytes []byte, urlPrefix string, metas map[string]string, isWiki bool) []byte {
 | 
						|
	return render(rawBytes, urlPrefix, metas, isWiki)
 | 
						|
}
 |