Tracking bound syntax pattern variables with syntax-parse

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Georges Dupéron e117e4f919 Modified syntax-case & friends to use with-pvars. Closes 181 current-pvars: use in syntax-case, with-syntax, define/with-syntax, is there any with-parse?		2017-01-28 05:16:48 +01:00
case	Modified syntax-case & friends to use with-pvars. Closes 181 current-pvars: use in syntax-case, with-syntax, define/with-syntax, is there any with-parse?	2017-01-28 05:16:48 +01:00
parse	Attempt to fix residual bug	2017-01-28 05:16:42 +01:00
scribblings	Modified syntax-case & friends to use with-pvars. Closes 181 current-pvars: use in syntax-case, with-syntax, define/with-syntax, is there any with-parse?	2017-01-28 05:16:48 +01:00
test	Support for define/syntax-parse, including when there are multiple defines. Search for the most up-to-date list of current-pvars is done by performing a dichotomy over a set of sequentially numbered current-pvars-paramNNN. Closes FB case 180.	2017-01-28 05:16:41 +01:00
.gitignore	Added package files	2017-01-28 05:16:16 +01:00
.travis.yml	Don't run versions < 6.3, as recent implementations of syntax-parse seem to have some small incompatibilities (e.g. racket/struct is missing from old Racket versions)	2017-01-28 05:16:40 +01:00
case.rkt	Modified syntax-case & friends to use with-pvars. Closes 181 current-pvars: use in syntax-case, with-syntax, define/with-syntax, is there any with-parse?	2017-01-28 05:16:48 +01:00
current-pvars.rkt	Documented define-pvars; Add the identifiers in reverse order as noted in the documentation.	2017-01-28 05:16:43 +01:00
info.rkt	Fallback for v6.3 which lacks scribble/example	2017-01-28 05:16:44 +01:00
LICENSE	Imported files from `28f1df4cff`	2017-01-28 05:16:11 +01:00
LICENSE.txt	Added package files	2017-01-28 05:16:16 +01:00
main.rkt	Implemented current-pvars	2017-01-28 05:16:36 +01:00
parse.rkt	Changed syntax/parse module paths to stxparse-info/parse	2017-01-28 05:16:33 +01:00
README.md	Bugfix: with-pvars must be called after binding the pvar, not before.	2017-01-28 05:16:38 +01:00

README.md

stxparse-info

The module stxparse-info/parse is a patched version of syntax/parse which tracks which syntax pattern variables are bound. This allows some libraries to change the way syntax pattern variables work.

For example, phc-graph/subtemplate automatically derives temporary identifiers when a template contains yᵢ …, and xᵢ is a pattern variable. To know from which varᵢ the yᵢ … identifiers must be derived, phc-graph/subtemplate needs to know which syntax pattern variables are within scope.

To use this package, simply require stxparse-info/pares instead of syntax/parse Additionally, it is possible to use the for-syntax function (current-pvars) from stxparse-info/current-pvars to access the list of currently-bound pattern variables, and the macro (with-pvars (pvar ...) . body) can be used to add new pattern variables to the list.