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Snippet support for tabstop, camel/pascal case transforms

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Allows tabstops to take regex transformations, and also allows for the use of `camelcase` and `pascalcase` directives.

Based on the documentation found in VSCode:

7ec55aa30e/src/vs/editor/contrib/snippet/browser/snippet.md (L118)
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Riley Bruins 2024-12-04 11:52:19 -08:00
parent 90e7853d94
commit d0da875f5d
1 changed files with 9 additions and 6 deletions
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15
_specifications/lsp/3.18/language/completion.md
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@ -935,15 +935,18 @@ Below is the grammar for snippets in EBNF ([extended Backus-Naur form, XML varia
```
any ::= tabstop | placeholder | choice | variable | text
tabstop ::= '$' int | '${' int '}'
tabstop ::= '$' int
| '${' int '}'
| '${' int transform '}'
placeholder ::= '${' int ':' any '}'
choice ::= '${' int '|' choicetext (',' choicetext)* '|}'
variable ::= '$' var | '${' var }'
| '${' var ':' any '}'
| '${' var '/' regex '/' (format | formattext)* '/' options '}'
| '${' var transform '}'
transform ::= '/' regex '/' (format | formattext)* '/' options
format ::= '$' int | '${' int '}'
/* Transforms the text to be uppercase, lowercase, or capitalized, respectively. */
| '${' int ':' ('/upcase' | '/downcase' | '/capitalize') '}'
/* Transforms the text to be uppercase, lowercase, capitalized, camelcase, or pascalcase, respectively. */
| '${' int ':' ('/upcase' | '/downcase' | '/capitalize' | '/camelcase' | '/pascalcase') '}'
/* Inserts the 'ifOnly' text if the match is non-empty. */
| '${' int ':+' ifOnly '}'
/* Inserts the 'if' text if the match is non-empty,
@ -951,8 +954,8 @@ format ::= '$' int | '${' int '}'
| '${' int ':?' if ':' else '}'
/* Inserts the 'else' text if the match is empty. */
| '${' int ':-' else '}' | '${' int ':' else '}'
regex ::= Regular Expression value (ctor-string)
options ::= Regular Expression option (ctor-options)
regex ::= JavaScript Regular Expression value (ctor-string)
options ::= JavaScript Regular Expression option (ctor-options)
var ::= [_a-zA-Z] [_a-zA-Z0-9]*
int ::= [0-9]+
text ::= ([^$}\] | '\$' | '\}' | '\\')*