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Docs: document the set! predicate

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I was looking for something like this,
I searched the documentation,
but I found it in https://github.com/tree-sitter/tree-sitter-javascript/blob/master/queries/injections.scm#L15
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Santos Gallegos 2020-07-27 17:38:32 -05:00
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docs/section-4-syntax-highlighting.md
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@ -385,6 +385,14 @@ The following query would specify that the contents of the heredoc should be par
(heredoc_end) @injection.language) @injection.content (heredoc_end) @injection.language) @injection.content
``` ```
You can also force the language using the `#set!` predicate.
For example, this will force the language to be always `ruby`.
```
((heredoc_body) @injection.content
(#set! injection.language "ruby"))
```
## Unit Testing ## Unit Testing
Tree-sitter has a built-in way to verify the results of syntax highlighting. The interface is based on [Sublime Text's system](https://www.sublimetext.com/docs/3/syntax.html#testing) for testing highlighting. Tree-sitter has a built-in way to verify the results of syntax highlighting. The interface is based on [Sublime Text's system](https://www.sublimetext.com/docs/3/syntax.html#testing) for testing highlighting.