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CLIENT-SPECIFICATION: fix typo, add a way to escape the placeholder syntax #10730

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Merged
merged 4 commits into from
Nov 17, 2023
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CLIENT-SPECIFICATION: fix typo, add a way to escape the placeholder syntax #10730

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CLIENT-SPECIFICATION: add a way to escape the placeholder syntax
acuteenvy Sep 17, 2023
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Merge branch 'main' into client-spec-10125
kbdharun Nov 6, 2023
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Update CLIENT-SPECIFICATION.md
kbdharun Nov 16, 2023
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CLIENT-SPECIFICATION: update page structure section
kbdharun Nov 16, 2023
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7 changes: 6 additions & 1 deletion CLIENT-SPECIFICATION.md
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Expand Up @@ -116,7 +116,12 @@ The structure inside these translation folders is identical to that of the main

## Page structure

Although this specification is about the interface that clients must provide, it is also worth noting that pages are written in standard [CommonMark](https://commonmark.org/), which the exception of the non-standard `{{` and `}}` syntax, which surrounds values in an example that users may edit. Clients MUST NOT break if the page format is changed within the _CommonMark_ specification.
Although this specification is about the interface that clients must provide, it is also worth noting that pages are written in standard [CommonMark](https://commonmark.org/), with the exception of the non-standard `{{` and `}}` placeholder syntax, which surrounds values in an example that users may edit. Clients MAY highlight the placeholders and MUST remove the surrounding curly braces. Clients MUST display the `{{` and `}}` if escaped using `\` (i.e. `\{\{` and `\}\}`). Clients MUST NOT break if the page format is changed within the _CommonMark_ specification.

### Examples

- `ping {{example.com}}` MUST be rendered as "ping example.com"
- `docker inspect --format '\{\{range.NetworkSettings.Networks\}\}\{\{.IPAddress\}\}\{\{end\}\}' {{container}}` MUST be rendered as "docker inspect --format '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container"
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I would personally lighten the syntax to only one backslash:
docker inspect --format '\{{range.NetworkSettings.Networks\}}\{{.IPAddress\}}\{{end\}}' {{container}}.

This is maybe easier to parse than what I had proposed, but still not too heavy for reading source pages (even though this isn't done often). The drawback could if we needed to render something like \{{ <...> }}

But since I've seen only 3 occurrences of this problem, maybe this change is not needed. 🤷🏻

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@SethFalco SethFalco Sep 18, 2023 •
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I favor a backslash for each curly brace. I think it's much more intuitive to treat things per character, rather than by our special definition attributed to combinations of characters.

In Markdown, \{ already means a literal {. So we should run with it. This will also be more backward compatible. When we don't mean the placeholder syntax, {{ is never found, so even if the client doesn't know to ignore it, it'll inadvertently ignore it anyway.

This will be simpler than giving {{ conditional meaning based on an escape sequence multiple characters away.

If a client finds \{{range.NetworkSettings.Networks\}}, and processes placeholders before delegating to the CommonMark library, it's probably going to mess up unless it knows to check for a backslash. If a client finds \{\{range.NetworkSettings.Networks\}\} without any special handling, it knows it's not a placeholder, and the CommonMark library will just do its magic.

For nested curly braces inside the placeholder syntax:

Syntax Arg (curly braces removed) Rendered
{{uwu}} uwu uwu
{{\{uwu\}}} \{uwu\} {uwu}
{{\{\{uwu\}\}}} \{\{uwu\}\} {{uwu}}

The main difference, here, is that having a single escape sequence affect multiple characters would require special handling from clients, while doing one escape sequence per character is already supported/expected by clients and CommonMark parsers. The benefits assume the client is using a CommonMark library to parse the page.



## Page resolution
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