Sam Atkins 2b3185955e LibWeb: Use StateTransaction for UnicodeRange parsing ...

...and change how the two parsing steps fit together.

The two steps were previously quite muddled. Both worked with the
TokenStream directly, and both were responsible for rewinding that
stream if there was an error. This is both confusing and also made it
impossible to replace the rewinding with StateTransactions.

This commit more clearly divides the work between the two functions: One
parses ComponentValues and produces a string, and the other parses that
string to produce the UnicodeRange. It also replaces manual rewinding
in the former with StateTransactions.

2022-04-29 00:07:31 +02:00

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