anchors don't work when contains punctuation marks just like `（` or `(`

[lazyky]

Description

Markdown Heading ID contains Unicode （ is inconsistent with Github.
For #### test（1） in gitea , the id is "user-content-test-1" and in github it is "user-content-test1"

The markdown below is available for jumping on github, but not for gitea.

#### test（1）
to [test（1）](#test1)

gitea

id = "user-content-test-1"

github

id = "user-content-test1"

Gitea Version

1.20.2

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

I was able to reproduce it using try.gitea.io.

Database

None

[CaiCandong]

What's the impact of this problem?

[bioinformatist]

@CaiCandong

Sometimes we need to use section titles like this:

However, the malfunction of the anchors pointing to them makes reading somewhat difficult.

[CaiCandong]

Markdown Heading ID contains Unicode （ is inconsistent with Github.

Thanks for the report, I understand the problem, besides （ does this problem also occur when using ( directly?

[lazyky]

Markdown Heading ID contains Unicode （ is inconsistent with Github.

Thanks for the report, I understand the problem, besides （ does this problem also occur when using ( directly?

Yes. I also test (, !, :, *, ： and ！. They are same as （ . @CaiCandong

#### test(0)

#### test!1

#### test:2

#### test*3

#### test！4

#### test：5

gitea

github

[CaiCandong]

I've located the code for this problem, it has to do with the user-conent-* generation rules, but I'm not particularly sure how github handles this, can you give me some more examples to help me refine the code?

#### test：ad # df
#### test：ad # df
#### test：ad #23 df 2*/*

[lazyky]

test：ad # df

test：ad # df

test：ad #23 df 2*/*

github

There are the examples on github

[CaiCandong]

def cheanValue(anchor_name):
    anchor_name = anchor_name.strip()
    ret = []
    for c in anchor_name:
        if c.isalpha() or c.isdigit() or c == '_' or c == '-':
            ret.append(c.lower())
        if c == ' ':
            ret.append('-')
    return ''.join(ret)

def test():
    cases = [
        ["", ""],
        ["test(0)", "test0"],
        ["test!1", "test1"],
        ["test:2", "test2"],
        ["test*3", "test3"],
        ["test！4", "test4"],
        ["test：5", "test5"],
        ["test*6", "test6"],
        ["test：6 a", "test6-a"],
        ["test：6 !b", "test6-b"],
        ["test：ad # df", "testad--df"],
        ["test：ad #23 df 2*/*", "testad-23-df-2"],
        ["test：ad 23 df 2*/*", "testad-23-df-2"],
        ["test：ad # 23 df 2*/*", "testad--23-df-2"],
        ["Anchors in Markdown", "anchors-in-markdown"],
        ["a_b_c", "a_b_c"],
        ["a-b-c", "a-b-c"],
        ["a-b-c----", "a-b-c----"],
        ["test：6a", "test6a"],
        ["test：a6", "testa6"],
        ["tes a a   a  a", "tes-a-a---a--a"],
        ["  tes a a   a  a  ", "tes-a-a---a--a"]]
    for parm,expect in cases:
        if cheanValue(parm) != expect:
            print("error: parm: %s, expect: %s, actual: %s" % (parm, expect, cheanValue(parm)))
test()

Can you help me write some test cases from github to verify that the logic of the cheanValue function is consistent with github?
@lazyky @bioinformatist

[wxiaoguang]

This one is also related: Different behaviors when generating Markdown links for headings containing punctuations and other symbols #19745

Quote the old comment from that issue:

---

I would say it's more like a feature but not a bug, because Markdown is not a strict system, and there seems no unique standard.

There are various characters would be removed&replaced during URL generation. For example, the single quote ' in your demo file, too.

https://github.com/federico-ntr/gitea-double-quotes-test#placeholder-to-force-scrolling-on-links-click
https://try.gitea.io/federico-ntr/double-quotes-test#placeholder-to-force-scrolling-on-link-s-click

Since there is no standard, so there is no right or wrong, as long as it works.

Maybe the answer to the question could be: if there is a definition in CommonMark, then make upstream goldmark use CommonMark standard.

[CaiCandong]

I would say it's more like a feature but not a bug, because Markdown is not a strict system, and there seems no unique standard.

I understand what you're saying, and it's not a bug. But do we need to adjust it so that github/vscode is consistent?

[wxiaoguang]

Just to share the information from old issues. I am neutral for it.

[bioinformatist]

This one is also related: Different behaviors when generating Markdown links for headings containing punctuations and other symbols #19745

Quote the old comment from that issue:

I would say it's more like a feature but not a bug, because Markdown is not a strict system, and there seems no unique standard.

There are various characters would be removed&replaced during URL generation. For example, the single quote ' in your demo file, too.

https://github.com/federico-ntr/gitea-double-quotes-test#placeholder-to-force-scrolling-on-links-click
https://try.gitea.io/federico-ntr/double-quotes-test#placeholder-to-force-scrolling-on-link-s-click

Since there is no standard, so there is no right or wrong, as long as it works.

Maybe the answer to the question could be: if there is a definition in CommonMark, then make upstream goldmark use CommonMark standard.

Got that. Sure it is not a bug, but it seems that the logic of github is more straightforward and easier to use.

[lazyky]

def cheanValue(anchor_name):
    anchor_name = anchor_name.strip()
    ret = []
    for c in anchor_name:
        if c.isalpha() or c.isdigit() or c == '_' or c == '-':
            ret.append(c.lower())
        if c == ' ':
            ret.append('-')
    return ''.join(ret)

def test():
    cases = [
        ["", ""],
        ["test(0)", "test0"],
        ["test!1", "test1"],
        ["test:2", "test2"],
        ["test*3", "test3"],
        ["test！4", "test4"],
        ["test：5", "test5"],
        ["test*6", "test6"],
        ["test：6 a", "test6-a"],
        ["test：6 !b", "test6-b"],
        ["test：ad # df", "testad--df"],
        ["test：ad #23 df 2*/*", "testad-23-df-2"],
        ["test：ad 23 df 2*/*", "testad-23-df-2"],
        ["test：ad # 23 df 2*/*", "testad--23-df-2"],
        ["Anchors in Markdown", "anchors-in-markdown"],
        ["a_b_c", "a_b_c"],
        ["a-b-c", "a-b-c"],
        ["a-b-c----", "a-b-c----"],
        ["test：6a", "test6a"],
        ["test：a6", "testa6"],
        ["tes a a   a  a", "tes-a-a---a--a"],
        ["  tes a a   a  a  ", "tes-a-a---a--a"]]
    for parm,expect in cases:
        if cheanValue(parm) != expect:
            print("error: parm: %s, expect: %s, actual: %s" % (parm, expect, cheanValue(parm)))
test()

Can you help me write some test cases from github to verify that the logic of the cheanValue function is consistent with github? @lazyky @bioinformatist

Yes. That's right, but "" will not be rendered

github