Expose matched `text`

[tjvr]

There's currently a subtle edge-case when using Moo and nearley together. As a convenience, nearley allows matching tokens based on their value:

You can still use raw strings, but they will only match full tokens parsed by Moo. This is convenient for matching keywords.

ifStatement -> "if" condition "then" block

The edge case is that nearley only checks the value, not the type. So it's very easily to accidentally match, e.g., a quoted string with the value if!

This is only a problem when using capture groups (now value transformers). #63

Solution: expose text (the contents of the entire untransformed match), and modify nearley to use that instead.

[tjvr]

Closed via abba951.