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Add snake_case to transform grammar in snippets #233798

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joeriddles opened this issue Nov 13, 2024 · 3 comments · May be fixed by #237110
Open

Add snake_case to transform grammar in snippets #233798

joeriddles opened this issue Nov 13, 2024 · 3 comments · May be fixed by #237110
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@jrieken
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feature-request Request for new features or functionality snippets
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Backlog

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@joeriddles
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joeriddles commented Nov 13, 2024 •
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VS Code snippet transform syntax supports converting capture groups to a variety of formats, including lowercase, camelCase, and PascalCase. Support for snake_case would be awesome.

See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_grammar

This feature would be helpful when trying to define a snippet that automatically adds a json struct tag to Go fields, for example:

type Person struct {
    FirstName `json:"first_name"`
}

This is the snippet definition I'm using right now, though it's buggy:

"property with JSON and YAML": {
	"prefix": "prop",
	"body": [
		"${1:name} ${2:string} `yaml:\"${1/([A-Z]?[a-z]+)([A-Z])/${1:/downcase}_${2:/downcase}/g}\" json:\"${1/([A-Z]?[a-z]+)([A-Z])/${1:/downcase}_${2:/downcase}/g}\"`"
	],
},
@jrieken jrieken added feature-request Request for new features or functionality snippets labels Nov 14, 2024
@vs-code-engineering vs-code-engineering bot added this to the Backlog Candidates milestone Nov 14, 2024
@vs-code-engineering VS Code Engineering
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This feature request is now a candidate for our backlog. The community has 60 days to upvote the issue. If it receives 20 upvotes we will move it to our backlog. If not, we will close it. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!

@RedCMD
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RedCMD commented Dec 16, 2024

relevant file section:

vscode/src/vs/editor/contrib/snippet/browser/snippetParser.ts

Lines 379 to 397 in ce50bd4

resolve(value?: string): string {
if (this.shorthandName === 'upcase') {
return !value ? '' : value.toLocaleUpperCase();
} else if (this.shorthandName === 'downcase') {
return !value ? '' : value.toLocaleLowerCase();
} else if (this.shorthandName === 'capitalize') {
return !value ? '' : (value[0].toLocaleUpperCase() + value.substr(1));
} else if (this.shorthandName === 'pascalcase') {
return !value ? '' : this._toPascalCase(value);
} else if (this.shorthandName === 'camelcase') {
return !value ? '' : this._toCamelCase(value);
} else if (Boolean(value) && typeof this.ifValue === 'string') {
return this.ifValue;
} else if (!Boolean(value) && typeof this.elseValue === 'string') {
return this.elseValue;
} else {
return value || '';
}
}

@vs-code-engineering VS Code Engineering
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🙂 This feature request received a sufficient number of community upvotes and we moved it to our backlog. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!

@joeriddles joeriddles linked a pull request Dec 31, 2024 that will close this issue
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Add snakecase to snippets syntax joeriddles/vscode
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@jrieken @joeriddles @RedCMD