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Automatically track expected tokens while parsing #711

Merged
merged 1 commit into from
Oct 26, 2020
Merged

Automatically track expected tokens while parsing #711

merged 1 commit into from
Oct 26, 2020

Commits on Oct 26, 2020

  1. Automatically track expected tokens while parsing 

    Remove all manual tracking of which tokens would have been accepted by
the parser in favor of having the parser add tokens that it checks for
to a set of expected tokens, clearing them when it accepts a token, and
using the current contents of the set in error messages.

This is a massive improvement, and will make the parser easier to
modify going forward.

And, this actually solves my sole issue with hand-written parsers.

Thanks to matklad on reddit for suggesting this!
    @casey
    casey committed Oct 26, 2020
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