24 lines
1.4 KiB
Markdown
24 lines
1.4 KiB
Markdown
[](https://travis-ci.org/jsmaniac/stxparse-info)
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[](https://codecov.io/gh/jsmaniac/stxparse-info)
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[](http://jsmaniac.github.io/travis-stats/#jsmaniac/stxparse-info)
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[](http://docs.racket-lang.org/stxparse-info/)
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stxparse-info
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=============
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The module `stxparse-info/parse` is a patched version of `syntax/parse` which
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tracks which syntax pattern variables are bound. This allows some libraries to
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change the way syntax pattern variables work.
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For example, `phc-graph/subtemplate` automatically derives temporary
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identifiers when a template contains `yᵢ …`, and `xᵢ` is a pattern
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variable. To know from which `varᵢ` the `yᵢ …` identifiers must be derived,
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`phc-graph/subtemplate` needs to know which syntax pattern variables are
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within scope.
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To use this package, simply require `stxparse-info/pares` instead of
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`syntax/parse` Additionally, it is possible to use the for-syntax function
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`(current-pvars)` from `stxparse-info/current-pvars` to access the list of
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currently-bound pattern variables, and the macro `(with-pvars (pvar ...)
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. body)` can be used to add new pattern variables to the list. |