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This allows us to panic whenever the user passed an extension that is not defined for a given API, instead of silently continuing and leaving them wonder if/why any output is generated based on what they specified.
Some enums (currently only `GL_ACTIVE_PROGRAM_EXT`) have duplicate definitions with different values based on the selected API. Without this filter both will be emitted based on a simple regex filter by name only, thus make sure we only read the enums At the same time `api` filters apply to `<require>` blocks too: this allows certain extensions to pull in different names or bindings based on the API they're defined for, and we must make sure to only handle the block that matches `filter.api`.
By stripping and later appending a *possible* prefix for enum constants and command names we're not only spending a lot of CPU and human cycles (because this logic is impossible to understand), we're also loosing out on a few WGL commands that weren't prefixed with the `wgl` name. Conveniently these functions were referencing a typo'd `PIXELFORMATDESCRIPTOR` without leading `P`, which might otherwise not have been found. Do this by keeping all commands and enums keyed by their full name in `BTreeMap`s so that we can also track completely accurately when a `<delete>` or `<require>` would erroneously specify a name that doesn't exist.
…ms group="">` parsing Note that groups are currently entirely unused in the generator, but could become useful soon to emit typed APIs for existing `<param group="">` command arguments.
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Draft PR, currently containing the following improvements:
apifilters in<enum>and<require>boxas keyword, which is used in some parameters<groups>parsing with direct<enums group="">parsing