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Add a README.md to textparse package about how to update lexers.

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Signed-off-by: Callum Styan <callumstyan@gmail.com>
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Callum Styan 2019-10-23 23:03:08 -07:00
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# Making changes to textparse lexers
In the rare case that you need to update the textparse lexers, edit promlex.l or openmetricslex.l and then run the following command:
`golex -o=promlex.l.go promlex.l`
Note that you need golex installed:
`go get -u modernc.org/golex`