OG
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An OpenGraph (Link Preview) parser in Swift

For example, `TagTracker` could remember the value for `` in case `og:title` is missing
When testing OG we found that it failed to parse many websites that contain valid OpenGraph tags. We debugged it and found that the built-in Parser object fails to parse...
This doesn't seem to compile with Carthage anymore? Using Xcode 9, iOS 11.
This way, we could pass in things like input streams that can fetch data from network lazily to process input, and would let us get rid of `String.characterAt(_:)` which assumes...