If SwiftLint is built from this state using the Swift SDK, we'll get a
large self-contained Linux executable that runs without loading SourceKit.
It can do that by disabling any rule that requires SourceKit.
With `SWIFTLINT_DISABLE_SOURCEKIT` set on a normally (dynamically linked)
binary, the behavior is the same. That's different from the previously
reported more serious warnings.
This provides an alternative to getting syntax kinds from SourceKit. The
mappings aren't 100% equivalent, but this should serve as a useful
compatibility layer.
Ideally, SwiftLintCore would some day only contain components
that are needed to define rules. Consequently, it would be the
only bundle required to import for (external) rule development.
These macros remove some of the boilerplate involved when writing rules.
This change also adds test infrastructure for the macros used within
SwiftLint.
Advantages of having typical errors at a common place:
* Error message styling can be harmonized
* Existing messages can be reused
* Overview of prefixes ('error: ', 'warning: ')
* Manage how to print them to the console
Over the years, SwiftLintFramework had become a fairly massive monolith,
containing over 400 source files with both core infrastructure and
rules.
Architecturally, the rules should rely on the core infrastructure but
not the other way around. There are two exceptions to this:
`custom_rules` and `superfluous_disable_command` which need special
integration with the linter infrastructure.
Now the time has come to formalize this architecture and one way to do
that is to move the core SwiftLint functionality out of
SwiftLintFramework and into a new SwiftLintCore module that the rules
can depend on.
Beyond enforcing architectural patterns, this also has the advantage of
speeding up incremental compilation by skipping rebuilding the core
functionality when iterating on rules.
Because the core functionality is always useful when building rules, I'm
opting to import SwiftLintCore in SwiftLintFramework as `@_exported` so
that it's implicitly available to all files in SwiftLintFramework
without needing to import it directly.
In a follow-up I'll also split the built-in rules and the extra rules
into their own modules. More modularization is possible from there, but
not planned.
The bulk of this PR just moves files from `Source/SwiftLintFramework/*`
to `Source/SwiftLintCore/*`. There are some other changes that can't be
split up into their own PRs:
* Change jazzy to document the SwiftLintCore module instead of
SwiftLintFramework.
* Change imports in unit tests to reflect where code was moved to.
* Update `sourcery` make rule to reflect where code was moved to.
* Create a new `coreRules` array and register those rules with the
registry. This allows the `custom_rules` and
`superfluous_disable_command` rule implementations to remain internal
to the SwiftLintCore module, preventing more implementation details
from leaking across architectural layers.
* Move `RuleRegistry.registerAllRulesOnce()` out of the type declaration
and up one level so it can access rules defined downstream from
SwiftLintCore.
Danny Mösch
JP Simard
Koichiro Ueki