Shudhanshu Singh ee10ae168c perf(emoji): optimize FindEmojiSubmatchIndex using slice-based Trie (#38573) ...

This pull request optimizes `FindEmojiSubmatchIndex` in Gitea's emoji
package (`modules/emoji/emoji.go`) by replacing the
`strings.Replacer`-based search with a slice-based trie and a
constant-time starting-byte check (`isStartingByte`).

The new implementation avoids heap allocations during the search and
reduces CPU overhead when rendering Markdown, particularly for plain
text that does not contain emojis.

### Verification

Verified with unit tests:

```sh
go test -count=1 ./modules/emoji/...
```

Benchmarks:

```sh
go test -bench=. -benchmem ./modules/emoji/...
```

### Results

| Benchmark | Before | After |
| ---------- | ------ | ----- |
| `BenchmarkFindEmojiSubmatchIndex` | 168.3 ns/op, 2 allocs/op | 85.78
ns/op, 1 alloc/op |
| `BenchmarkFindEmojiSubmatchIndexNoMatch` | 239.8 ns/op, 1 alloc/op |
105.1 ns/op, 0 allocs/op |
### Benchmark Output

```text
goos: linux
goarch: amd64
pkg: gitea.dev/modules/emoji
cpu: Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz

BenchmarkFindEmojiSubmatchIndex-4              13498539        85.78 ns/op      16 B/op   1 allocs/op
BenchmarkFindEmojiSubmatchIndexNoMatch-4       11220450       105.1 ns/op        0 B/op   0 allocs/op
BenchmarkFindEmojiSubmatchIndexOld-4            6569360       168.3 ns/op      48 B/op   2 allocs/op
BenchmarkFindEmojiSubmatchIndexOldNoMatch-4     5026116       239.8 ns/op      32 B/op   1 allocs/op
```

---------

Signed-off-by: Sudhanshu Singh <sudhanshuwriterblc@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

2026-07-23 08:29:28 +00:00

..

actions

fix(actions): support matrix when evaluating workflow if expression (#38474)

2026-07-21 06:43:45 +00:00

analyze

Fix incorrect vendored detections (#36508)

2026-02-01 10:35:51 +00:00

assetfs

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

auth

fix: various security fixes (#38406)

2026-07-12 17:14:09 +00:00

avatar

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

badge

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

base

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

cache

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

cachegroup

Cache GPG keys, emails and users when list commits (#34086)

2025-04-09 16:34:38 +00:00

charset

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

commitstatus

Update Combine method to treat warnings as failures and adjust tests (#37048)

2026-03-31 17:22:18 +00:00

consts

feat(ssh): auto generate additional ssh keys (#33974)

2026-06-08 18:18:58 +00:00

container

Refactor sidebar assignee&milestone&project selectors (#32465)

2024-11-11 04:07:54 +08:00

csv

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

dump

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

emoji

perf(emoji): optimize FindEmojiSubmatchIndex using slice-based Trie (#38573)

2026-07-23 08:29:28 +00:00

eventsource

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

fileicon

refactor: decouple git.Repository(ctx) from git.Commit & git.Tree (#38464)

2026-07-15 17:30:01 +00:00

generate

feat(ssh): auto generate additional ssh keys (#33974)

2026-06-08 18:18:58 +00:00

git

refactor: clean up git repo and model migration packages (#38564)

2026-07-23 01:22:26 +00:00

glob

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

globallock

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

graceful

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

gtprof

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

hcaptcha

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

highlight

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

hostmatcher

fix: various security fixes (#38406)

2026-07-12 17:14:09 +00:00

htmlutil

feat(web): Add Jupyter Notebook (.ipynb) Rendering Support (#37433)

2026-06-14 15:52:37 +02:00

httpcache

fix: remove "no-transfrom" from the cache-control header (#37985)

2026-06-04 00:12:02 +08:00

httplib

fix: remove "no-transfrom" from the cache-control header (#37985)

2026-06-04 00:12:02 +08:00

indexer

refactor: make git package handle all git operations (#38543)

2026-07-20 16:07:38 +00:00

issue/template

refactor: remove Ctx field from git.Repository (#38500)

2026-07-17 18:44:31 +08:00

json

Fix corrupted JSON caused by goccy library (#37214)

2026-04-14 14:00:20 +00:00

label

enhance: Migrate remaining gopkg.in/yaml.v3 usages to go.yaml.in/yaml/v4 (#37866)

2026-05-29 01:12:11 +00:00

lfs

refactor: make git package handle all git operations (#38543)

2026-07-20 16:07:38 +00:00

lfstransfer

refactor: fix legacy problems in cmd/serv.go (#38505)

2026-07-17 22:28:59 +08:00

log

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

markup

chore(typo): fix grammar in comments, API docs and error messages (#38370)

2026-07-08 23:52:06 +02:00

mcaptcha

refactor: implement mcaptcha client and add comments/tests (#38561)

2026-07-21 13:41:54 +00:00

metrics

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

migration

enhance: Migrate remaining gopkg.in/yaml.v3 usages to go.yaml.in/yaml/v4 (#37866)

2026-05-29 01:12:11 +00:00

nosql

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

optional

enhance: Migrate remaining gopkg.in/yaml.v3 usages to go.yaml.in/yaml/v4 (#37866)

2026-05-29 01:12:11 +00:00

options

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

packages

fix: various security fixes (#38406)

2026-07-12 17:14:09 +00:00

paginator

feat(ui): add "follow rename" to file commit history list (#34994)

2026-06-03 17:40:38 +00:00

pprof

refactor: fix legacy problems in cmd/serv.go (#38505)

2026-07-17 22:28:59 +08:00

private

refactor: fix legacy problems in cmd/serv.go (#38505)

2026-07-17 22:28:59 +08:00

process

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

proxy

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

proxyprotocol

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

public

fix(frontend): resolve Vite assets by manifest source path (#37836)

2026-05-28 06:14:52 +00:00

queue

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

recaptcha

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

references

chore(typo): fix grammar in comments, API docs and error messages (#38370)

2026-07-08 23:52:06 +02:00

regexplru

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

repository

refactor: clean up git repo and model migration packages (#38564)

2026-07-23 01:22:26 +00:00

reqctx

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

secret

Upgrade golangci-lint to v1.64.5 (#33654)

2025-02-21 00:05:40 +08:00

session

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

setting

enhance(ui): use OpenAPI 3.0 spec in API viewer, add spec buttons (#38478)

2026-07-16 17:38:33 +00:00

sitemap

chore: fix form string abuse (#38106)

2026-06-14 18:26:22 +00:00

ssh

test: compare key file contents instead of FileInfo in TestInitKeys (#38330)

2026-07-04 22:30:12 +02:00

storage

fix: minio init check (#38355)

2026-07-07 07:32:25 +00:00

structs

fix(api): align Swagger schemas for UserSettings and TopicListResponse (#38590)

2026-07-23 14:49:52 +08:00

svg

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

system

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

tailmsg

Support performance trace (#32973)

2025-01-21 18:57:07 +00:00

tempdir

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

templates

refactor: remove Path field from git.Repository (#38552)

2026-07-20 18:03:28 +00:00

test

feat(repo): support file exclusion logic in .gitea/template in template generation (#38064)

2026-07-22 20:14:18 +00:00

testlogger

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

timeutil

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

translation

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

turnstile

fix(turnstile): route CAPTCHA verification through the configured proxy (#38412)

2026-07-12 11:33:14 +00:00

typesniffer

Feature non-zipped actions artifacts (action v7) (#36786)

2026-03-26 00:37:48 +08:00

updatechecker

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

uri

fix: various security fixes (#38406)

2026-07-12 17:14:09 +00:00

user

Refactor older tests to use testify (#33140)

2025-01-09 09:21:47 +08:00

util

perf(emoji): optimize FindEmojiSubmatchIndex using slice-based Trie (#38573)

2026-07-23 08:29:28 +00:00

validation

chore: Move import path from code.gitea.io/gitea to gitea.dev (#37873)

2026-05-26 15:49:31 -07:00

web

fix: enforce public-only token scope and harden push options / locale parsing (#38323)

2026-07-10 16:39:01 +00:00

webhook

actions: report commit status for pull_request_review events (#36589)

2026-02-20 16:12:22 +00:00

zstd

chore(deps): upgrade zstd seekable package (#37988)

2026-06-04 13:38:56 +00:00