extract CSS selector cache into CSS::SelectorCache#3226
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The methods `Parser.set_cache`, `Parser.cache_on?`, and `Parser.without_cache(&blk)` have been removed. The cache is now injected by `CSS.xpath_for` (optionally, via a `cache:` keyword argument) instead of being built into the parser. Documentation for `CSS.xpath_for` has also been updated and improved.
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What problem is this PR intended to solve?
This is part of a continuing track of work to separate out the concerns of CSS parser, CSS selector cache, and XPath expression translation into distinct components.
In this PR, I've extracted a CSS::SelectorCache class providing functionality that was previously built directly into CSS::Parser (with an awkward API that I'm responsible for writing in 2008).
Parser.set_cache,Parser.cache_on?, andParser.without_cache(&blk)have been removed.CSS.xpath_for(optionally, via acache:keyword argument) instead of being built into the parser.CSS.xpath_forhas also been updated and improved.Have you included adequate test coverage?
Mostly an internal refactor, existing test coverage is sufficient except where I removed tests of the removed methods.
Does this change affect the behavior of either the C or the Java implementations?
N/A