Update the PlaceholderFinder ASTWalker to walk into the clauses of
IfConfigDecls. It wasn't previously, resulting in any placeholders there not
being expanded.
Also update CallExprFinder (used to determine if expansions should use trailing
closure syntax) to walk into inactive if-config clauses. Previously it only
walked into active regions, so expansions never used trailing closure syntax in
inactive regions.
Resolves rdar://problem/51995648
In addition to brace statements (previously handled), several other
statements allow a trailing closure (return, yield, throw). Also fix the
handling of statements nested within expressions for closures - both
single-expression bodies and brace statements.
This also fixes a particular regression caused by single-expression
function bodies where we would fail to expand to a trailing closure when
a function body only contained a single expression.
rdar://50227500
When expanding placeholders, we analyze the surrounding context of a
placeholder to decide whether to expand the placeholder to a trailing
closure. This analysis assumes CallExpr is the only AST node with argument;
however UnresolvedMemberExpr can have argument as well. This commit
teaches the analysis logic to handle both.
SourceKit invariantly expands the last argument in a function call as trailing closure,
if it is of function type. However, there are situations when inline closures
are preferred; for example, when the last argument is not the only closure in the function
call. This patch modifies SourceKit so that when the argument contains multiple closures,
the last argument is expanded as inline closure.
The code goes into its own sub-tree under 'tools' but tests go under 'test',
so that running 'check-swift' will also run all the SourceKit tests.
SourceKit is disabled on non-darwin platforms.
