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https://codeberg.org/forgejo/forgejo
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In #26365 issue references were disabled entirely for documents, intending to match GitHub behavior. However cross-references do appear to work in documents on GitHub. This is useful for example to write release notes in a markdown document and reference issues. While the simpler syntax may create links when not intended, hopefully the cross-reference syntax is unique enough to avoid it.
596 lines
19 KiB
Go
596 lines
19 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package references
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import (
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"bytes"
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"net/url"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/markup/mdstripper"
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"code.gitea.io/gitea/modules/setting"
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"github.com/yuin/goldmark/util"
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)
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var (
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// validNamePattern performs only the most basic validation for user or repository names
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// Repository name should contain only alphanumeric, dash ('-'), underscore ('_') and dot ('.') characters.
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validNamePattern = regexp.MustCompile(`^[a-z0-9_.-]+$`)
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// NOTE: All below regex matching do not perform any extra validation.
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// Thus a link is produced even if the linked entity does not exist.
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// While fast, this is also incorrect and lead to false positives.
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// TODO: fix invalid linking issue
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// mentionPattern matches all mentions in the form of "@user" or "@org/team"
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mentionPattern = regexp.MustCompile(`(?:\s|^|\(|\[)(@[0-9a-zA-Z-_]+|@[0-9a-zA-Z-_]+\/?[0-9a-zA-Z-_]+|@[0-9a-zA-Z-_][0-9a-zA-Z-_.]+\/?[0-9a-zA-Z-_.]+[0-9a-zA-Z-_])(?:\s|[:,;.?!]\s|[:,;.?!]?$|\)|\])`)
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// issueNumericPattern matches string that references to a numeric issue, e.g. #1287
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issueNumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[|\')([#!][0-9]+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
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// issueAlphanumericPattern matches string that references to an alphanumeric issue, e.g. ABC-1234
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issueAlphanumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[)([A-Z]{1,10}-[1-9][0-9]*)(?:\s|$|\)|\]|:|\.(\s|$))`)
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// crossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository
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// e.g. org/repo#12345
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crossReferenceIssueNumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[)([0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+[#!][0-9]+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
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// crossReferenceCommitPattern matches a string that references a commit in a different repository
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// e.g. go-gitea/gitea@d8a994ef, go-gitea/gitea@d8a994ef243349f321568f9e36d5c3f444b99cae (7-40 characters)
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crossReferenceCommitPattern = regexp.MustCompile(`(?:\s|^|\(|\[)([0-9a-zA-Z-_\.]+)/([0-9a-zA-Z-_\.]+)@([0-9a-f]{7,40})(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
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// spaceTrimmedPattern let's find the trailing space
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spaceTrimmedPattern = regexp.MustCompile(`(?:.*[0-9a-zA-Z-_])\s`)
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// timeLogPattern matches string for time tracking
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timeLogPattern = regexp.MustCompile(`(?:\s|^|\(|\[)(@([0-9]+([\.,][0-9]+)?(w|d|m|h))+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
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issueCloseKeywordsPat, issueReopenKeywordsPat *regexp.Regexp
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issueKeywordsOnce sync.Once
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giteaHostInit sync.Once
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giteaHost string
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giteaIssuePullPattern *regexp.Regexp
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actionStrings = []string{
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"none",
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"closes",
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"reopens",
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"neutered",
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}
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)
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// XRefAction represents the kind of effect a cross reference has once is resolved
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type XRefAction int64
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const (
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// XRefActionNone means the cross-reference is simply a comment
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XRefActionNone XRefAction = iota // 0
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// XRefActionCloses means the cross-reference should close an issue if it is resolved
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XRefActionCloses // 1
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// XRefActionReopens means the cross-reference should reopen an issue if it is resolved
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XRefActionReopens // 2
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// XRefActionNeutered means the cross-reference will no longer affect the source
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XRefActionNeutered // 3
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)
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func (a XRefAction) String() string {
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return actionStrings[a]
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}
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// IssueReference contains an unverified cross-reference to a local issue or pull request
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type IssueReference struct {
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Index int64
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Owner string
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Name string
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Action XRefAction
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TimeLog string
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}
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// RenderizableReference contains an unverified cross-reference to with rendering information
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// The IsPull member means that a `!num` reference was used instead of `#num`.
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// This kind of reference is used to make pulls available when an external issue tracker
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// is used. Otherwise, `#` and `!` are completely interchangeable.
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type RenderizableReference struct {
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Issue string
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Owner string
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Name string
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CommitSha string
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IsPull bool
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RefLocation *RefSpan
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Action XRefAction
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ActionLocation *RefSpan
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}
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type rawReference struct {
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index int64
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owner string
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name string
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isPull bool
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action XRefAction
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issue string
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refLocation *RefSpan
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actionLocation *RefSpan
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timeLog string
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}
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func rawToIssueReferenceList(reflist []*rawReference) []IssueReference {
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refarr := make([]IssueReference, len(reflist))
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for i, r := range reflist {
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refarr[i] = IssueReference{
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Index: r.index,
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Owner: r.owner,
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Name: r.name,
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Action: r.action,
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TimeLog: r.timeLog,
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}
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}
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return refarr
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}
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// RefSpan is the position where the reference was found within the parsed text
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type RefSpan struct {
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Start int
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End int
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}
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func makeKeywordsPat(words []string) *regexp.Regexp {
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acceptedWords := parseKeywords(words)
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if len(acceptedWords) == 0 {
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// Never match
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return nil
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}
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return regexp.MustCompile(`(?i)(?:\s|^|\(|\[)(` + strings.Join(acceptedWords, `|`) + `):? $`)
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}
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func parseKeywords(words []string) []string {
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acceptedWords := make([]string, 0, 5)
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wordPat := regexp.MustCompile(`^[\pL]+$`)
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for _, word := range words {
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word = strings.ToLower(strings.TrimSpace(word))
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// Accept Unicode letter class runes (a-z, á, à, ä, )
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if wordPat.MatchString(word) {
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acceptedWords = append(acceptedWords, word)
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} else {
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log.Info("Invalid keyword: %s", word)
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}
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}
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return acceptedWords
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}
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func newKeywords() {
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issueKeywordsOnce.Do(func() {
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// Delay initialization until after the settings module is initialized
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doNewKeywords(setting.Repository.PullRequest.CloseKeywords, setting.Repository.PullRequest.ReopenKeywords)
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})
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}
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func doNewKeywords(close, reopen []string) {
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issueCloseKeywordsPat = makeKeywordsPat(close)
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issueReopenKeywordsPat = makeKeywordsPat(reopen)
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}
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// getGiteaHostName returns a normalized string with the local host name, with no scheme or port information
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func getGiteaHostName() string {
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giteaHostInit.Do(func() {
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if uapp, err := url.Parse(setting.AppURL); err == nil {
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giteaHost = strings.ToLower(uapp.Host)
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giteaIssuePullPattern = regexp.MustCompile(
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`(\s|^|\(|\[)` +
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regexp.QuoteMeta(strings.TrimSpace(setting.AppURL)) +
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`([0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+)/` +
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`((?:issues)|(?:pulls))/([0-9]+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
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} else {
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giteaHost = ""
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giteaIssuePullPattern = nil
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}
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})
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return giteaHost
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}
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// getGiteaIssuePullPattern
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func getGiteaIssuePullPattern() *regexp.Regexp {
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getGiteaHostName()
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return giteaIssuePullPattern
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}
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// FindAllMentionsMarkdown matches mention patterns in given content and
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// returns a list of found unvalidated user names **not including** the @ prefix.
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func FindAllMentionsMarkdown(content string) []string {
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bcontent, _ := mdstripper.StripMarkdownBytes([]byte(content))
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locations := FindAllMentionsBytes(bcontent)
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mentions := make([]string, len(locations))
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for i, val := range locations {
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mentions[i] = string(bcontent[val.Start+1 : val.End])
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}
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return mentions
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}
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// FindAllMentionsBytes matches mention patterns in given content
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// and returns a list of locations for the unvalidated user names, including the @ prefix.
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func FindAllMentionsBytes(content []byte) []RefSpan {
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// Sadly we can't use FindAllSubmatchIndex because our pattern checks for starting and
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// trailing spaces (\s@mention,\s), so if we get two consecutive references, the space
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// from the second reference will be "eaten" by the first one:
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// ...\s@mention1\s@mention2\s... --> ...`\s@mention1\s`, (not) `@mention2,\s...`
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ret := make([]RefSpan, 0, 5)
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pos := 0
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for {
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match := mentionPattern.FindSubmatchIndex(content[pos:])
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if match == nil {
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break
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}
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ret = append(ret, RefSpan{Start: match[2] + pos, End: match[3] + pos})
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notrail := spaceTrimmedPattern.FindSubmatchIndex(content[match[2]+pos : match[3]+pos])
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if notrail == nil {
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pos = match[3] + pos
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} else {
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pos = match[3] + pos + notrail[1] - notrail[3]
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}
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}
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return ret
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}
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// FindFirstMentionBytes matches the first mention in then given content
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// and returns the location of the unvalidated user name, including the @ prefix.
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func FindFirstMentionBytes(content []byte) (bool, RefSpan) {
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mention := mentionPattern.FindSubmatchIndex(content)
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if mention == nil {
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return false, RefSpan{}
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}
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return true, RefSpan{Start: mention[2], End: mention[3]}
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}
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// FindAllIssueReferencesMarkdown strips content from markdown markup
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// and returns a list of unvalidated references found in it.
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func FindAllIssueReferencesMarkdown(content string) []IssueReference {
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return rawToIssueReferenceList(findAllIssueReferencesMarkdown(content))
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}
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func findAllIssueReferencesMarkdown(content string) []*rawReference {
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bcontent, links := mdstripper.StripMarkdownBytes([]byte(content))
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return findAllIssueReferencesBytes(bcontent, links)
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}
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func convertFullHTMLReferencesToShortRefs(re *regexp.Regexp, contentBytes *[]byte) {
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// We will iterate through the content, rewrite and simplify full references.
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//
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// We want to transform something like:
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//
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// this is a https://ourgitea.com/git/owner/repo/issues/123456789, foo
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// https://ourgitea.com/git/owner/repo/pulls/123456789
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//
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// Into something like:
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//
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// this is a #123456789, foo
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// !123456789
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pos := 0
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for {
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// re looks for something like: (\s|^|\(|\[)https://ourgitea.com/git/(owner/repo)/(issues)/(123456789)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)
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match := re.FindSubmatchIndex((*contentBytes)[pos:])
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if match == nil {
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break
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}
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// match is a bunch of indices into the content from pos onwards so
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// to simplify things let's just add pos to all of the indices in match
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for i := range match {
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match[i] += pos
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}
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// match[0]-match[1] is whole string
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// match[2]-match[3] is preamble
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// move the position to the end of the preamble
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pos = match[3]
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// match[4]-match[5] is owner/repo
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// now copy the owner/repo to end of the preamble
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endPos := pos + match[5] - match[4]
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copy((*contentBytes)[pos:endPos], (*contentBytes)[match[4]:match[5]])
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// move the current position to the end of the newly copied owner/repo
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pos = endPos
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// Now set the issue/pull marker:
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//
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// match[6]-match[7] == 'issues'
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(*contentBytes)[pos] = '#'
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if string((*contentBytes)[match[6]:match[7]]) == "pulls" {
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(*contentBytes)[pos] = '!'
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}
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pos++
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// Then add the issue/pull number
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//
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// match[8]-match[9] is the number
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endPos = pos + match[9] - match[8]
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copy((*contentBytes)[pos:endPos], (*contentBytes)[match[8]:match[9]])
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// Now copy what's left at the end of the string to the new end position
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copy((*contentBytes)[endPos:], (*contentBytes)[match[9]:])
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// now we reset the length
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// our new section has length endPos - match[3]
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// our old section has length match[9] - match[3]
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*contentBytes = (*contentBytes)[:len(*contentBytes)-match[9]+endPos]
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pos = endPos
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}
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}
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// FindAllIssueReferences returns a list of unvalidated references found in a string.
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func FindAllIssueReferences(content string) []IssueReference {
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// Need to convert fully qualified html references to local system to #/! short codes
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contentBytes := []byte(content)
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if re := getGiteaIssuePullPattern(); re != nil {
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convertFullHTMLReferencesToShortRefs(re, &contentBytes)
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} else {
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log.Debug("No GiteaIssuePullPattern pattern")
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}
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return rawToIssueReferenceList(findAllIssueReferencesBytes(contentBytes, []string{}))
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}
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// FindRenderizableReferenceNumeric returns the first unvalidated reference found in a string.
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func FindRenderizableReferenceNumeric(content string, prOnly, crossLinkOnly bool) (bool, *RenderizableReference) {
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var match []int
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if !crossLinkOnly {
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match = issueNumericPattern.FindStringSubmatchIndex(content)
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}
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if match == nil {
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if match = crossReferenceIssueNumericPattern.FindStringSubmatchIndex(content); match == nil {
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return false, nil
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}
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}
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r := getCrossReference(util.StringToReadOnlyBytes(content), match[2], match[3], false, prOnly)
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if r == nil {
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return false, nil
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}
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return true, &RenderizableReference{
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Issue: r.issue,
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Owner: r.owner,
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Name: r.name,
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IsPull: r.isPull,
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RefLocation: r.refLocation,
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Action: r.action,
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ActionLocation: r.actionLocation,
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}
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}
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// FindRenderizableCommitCrossReference returns the first unvalidated commit cross reference found in a string.
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func FindRenderizableCommitCrossReference(content string) (bool, *RenderizableReference) {
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m := crossReferenceCommitPattern.FindStringSubmatchIndex(content)
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if len(m) < 8 {
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return false, nil
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}
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return true, &RenderizableReference{
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Owner: content[m[2]:m[3]],
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Name: content[m[4]:m[5]],
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CommitSha: content[m[6]:m[7]],
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RefLocation: &RefSpan{Start: m[2], End: m[7]},
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}
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}
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// FindRenderizableReferenceRegexp returns the first regexp unvalidated references found in a string.
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func FindRenderizableReferenceRegexp(content string, pattern *regexp.Regexp) (bool, *RenderizableReference) {
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match := pattern.FindStringSubmatchIndex(content)
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if len(match) < 4 {
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return false, nil
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}
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action, location := findActionKeywords([]byte(content), match[2])
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return true, &RenderizableReference{
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Issue: content[match[2]:match[3]],
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RefLocation: &RefSpan{Start: match[0], End: match[1]},
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Action: action,
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ActionLocation: location,
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IsPull: false,
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}
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}
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// FindRenderizableReferenceAlphanumeric returns the first alphanumeric unvalidated references found in a string.
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func FindRenderizableReferenceAlphanumeric(content string) (bool, *RenderizableReference) {
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match := issueAlphanumericPattern.FindStringSubmatchIndex(content)
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if match == nil {
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return false, nil
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}
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action, location := findActionKeywords([]byte(content), match[2])
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return true, &RenderizableReference{
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Issue: content[match[2]:match[3]],
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RefLocation: &RefSpan{Start: match[2], End: match[3]},
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Action: action,
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ActionLocation: location,
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IsPull: false,
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}
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}
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// FindAllIssueReferencesBytes returns a list of unvalidated references found in a byte slice.
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func findAllIssueReferencesBytes(content []byte, links []string) []*rawReference {
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ret := make([]*rawReference, 0, 10)
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pos := 0
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// Sadly we can't use FindAllSubmatchIndex because our pattern checks for starting and
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// trailing spaces (\s#ref,\s), so if we get two consecutive references, the space
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// from the second reference will be "eaten" by the first one:
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// ...\s#ref1\s#ref2\s... --> ...`\s#ref1\s`, (not) `#ref2,\s...`
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for {
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match := issueNumericPattern.FindSubmatchIndex(content[pos:])
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if match == nil {
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break
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}
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if ref := getCrossReference(content, match[2]+pos, match[3]+pos, false, false); ref != nil {
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ret = append(ret, ref)
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}
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notrail := spaceTrimmedPattern.FindSubmatchIndex(content[match[2]+pos : match[3]+pos])
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if notrail == nil {
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pos = match[3] + pos
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} else {
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pos = match[3] + pos + notrail[1] - notrail[3]
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}
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}
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pos = 0
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for {
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match := crossReferenceIssueNumericPattern.FindSubmatchIndex(content[pos:])
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if match == nil {
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break
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}
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if ref := getCrossReference(content, match[2]+pos, match[3]+pos, false, false); ref != nil {
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ret = append(ret, ref)
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}
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notrail := spaceTrimmedPattern.FindSubmatchIndex(content[match[2]+pos : match[3]+pos])
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if notrail == nil {
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pos = match[3] + pos
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} else {
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pos = match[3] + pos + notrail[1] - notrail[3]
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}
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}
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localhost := getGiteaHostName()
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for _, link := range links {
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if u, err := url.Parse(link); err == nil {
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// Note: we're not attempting to match the URL scheme (http/https)
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host := strings.ToLower(u.Host)
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if host != "" && host != localhost {
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continue
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}
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parts := strings.Split(u.EscapedPath(), "/")
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// /user/repo/issues/3
|
|
if len(parts) != 5 || parts[0] != "" {
|
|
continue
|
|
}
|
|
var sep string
|
|
if parts[3] == "issues" {
|
|
sep = "#"
|
|
} else if parts[3] == "pulls" {
|
|
sep = "!"
|
|
} else {
|
|
continue
|
|
}
|
|
// Note: closing/reopening keywords not supported with URLs
|
|
bytes := []byte(parts[1] + "/" + parts[2] + sep + parts[4])
|
|
if ref := getCrossReference(bytes, 0, len(bytes), true, false); ref != nil {
|
|
ref.refLocation = nil
|
|
ret = append(ret, ref)
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(ret) == 0 {
|
|
return ret
|
|
}
|
|
|
|
pos = 0
|
|
|
|
for {
|
|
match := timeLogPattern.FindSubmatchIndex(content[pos:])
|
|
if match == nil {
|
|
break
|
|
}
|
|
|
|
timeLogEntry := string(content[match[2]+pos+1 : match[3]+pos])
|
|
|
|
var f *rawReference
|
|
for _, ref := range ret {
|
|
if ref.refLocation != nil && ref.refLocation.End < match[2]+pos && (f == nil || f.refLocation.End < ref.refLocation.End) {
|
|
f = ref
|
|
}
|
|
}
|
|
|
|
pos = match[1] + pos
|
|
|
|
if f == nil {
|
|
f = ret[0]
|
|
}
|
|
|
|
if len(f.timeLog) == 0 {
|
|
f.timeLog = timeLogEntry
|
|
}
|
|
}
|
|
|
|
return ret
|
|
}
|
|
|
|
func getCrossReference(content []byte, start, end int, fromLink, prOnly bool) *rawReference {
|
|
sep := bytes.IndexAny(content[start:end], "#!")
|
|
if sep < 0 {
|
|
return nil
|
|
}
|
|
isPull := content[start+sep] == '!'
|
|
if prOnly && !isPull {
|
|
return nil
|
|
}
|
|
repo := string(content[start : start+sep])
|
|
issue := string(content[start+sep+1 : end])
|
|
index, err := strconv.ParseInt(issue, 10, 64)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
if repo == "" {
|
|
if fromLink {
|
|
// Markdown links must specify owner/repo
|
|
return nil
|
|
}
|
|
action, location := findActionKeywords(content, start)
|
|
return &rawReference{
|
|
index: index,
|
|
action: action,
|
|
issue: issue,
|
|
isPull: isPull,
|
|
refLocation: &RefSpan{Start: start, End: end},
|
|
actionLocation: location,
|
|
}
|
|
}
|
|
parts := strings.Split(strings.ToLower(repo), "/")
|
|
if len(parts) != 2 {
|
|
return nil
|
|
}
|
|
owner, name := parts[0], parts[1]
|
|
if !validNamePattern.MatchString(owner) || !validNamePattern.MatchString(name) {
|
|
return nil
|
|
}
|
|
action, location := findActionKeywords(content, start)
|
|
return &rawReference{
|
|
index: index,
|
|
owner: owner,
|
|
name: name,
|
|
action: action,
|
|
issue: issue,
|
|
isPull: isPull,
|
|
refLocation: &RefSpan{Start: start, End: end},
|
|
actionLocation: location,
|
|
}
|
|
}
|
|
|
|
func findActionKeywords(content []byte, start int) (XRefAction, *RefSpan) {
|
|
newKeywords()
|
|
var m []int
|
|
if issueCloseKeywordsPat != nil {
|
|
m = issueCloseKeywordsPat.FindSubmatchIndex(content[:start])
|
|
if m != nil {
|
|
return XRefActionCloses, &RefSpan{Start: m[2], End: m[3]}
|
|
}
|
|
}
|
|
if issueReopenKeywordsPat != nil {
|
|
m = issueReopenKeywordsPat.FindSubmatchIndex(content[:start])
|
|
if m != nil {
|
|
return XRefActionReopens, &RefSpan{Start: m[2], End: m[3]}
|
|
}
|
|
}
|
|
return XRefActionNone, nil
|
|
}
|
|
|
|
// IsXrefActionable returns true if the xref action is actionable (i.e. produces a result when resolved)
|
|
func IsXrefActionable(ref *RenderizableReference, extTracker bool) bool {
|
|
if extTracker {
|
|
// External issues cannot be automatically closed
|
|
return false
|
|
}
|
|
return ref.Action == XRefActionCloses || ref.Action == XRefActionReopens
|
|
}
|