Although libSyntax is designed in a way that trivia is attached to
tokens, we shouldn't restrict clients to access trivia only from a token.
An example can be doc-comment, which conceptually attaches to a declaration rather
than the start token of a declaration, like at-attributes.
Syntax nodes are designed as reusable blocks to construct Swift source
code. For this reason, we don't track absolute position in each node;
instead, the absolute position should be calculated on the fly when
needed. We recently found absolute positions are useful to bridge with
sourcekitd, which typically speaks in the language of line, column and
offset. Therefore, this patch tries to add a computed
property on SyntaxNode to get its absolute position.
To compute the absolute position of a SyntaxNode from scratch requires tree traversal.
However, getting the absolute position from these added APIs doesn't necessarily
mean we'll traverse since SyntaxData will actively cache the computed position.
Also, since we recursively compute the absolute position, all the position caches
for a SyntaxNode's previous siblings and ancestors will be populated as well during
the calculation of this SyntaxNode.
* Make Range conditionally a Collection
* Convert ClosedRange to conditionally a collection
* De-gyb Range/ClosedRange, refactoring some methods.
* Remove use of Countable{Closed}Range from stdlib
* Remove Countable use from Foundation
* Fix test errors and warnings resulting from Range/CountableRange collapse
* fix prespecialize test for new mangling
* Update CoreAudio use of CountableRange
* Update SwiftSyntax use of CountableRange
* Restore ClosedRange.Index: Hashable conformance
* Move fixed typechecker slowness test for array-of-ranges from slow to fast, yay
* Apply Doug's patch to loosen test to just check for error
* [SwiftSyntax] Fix SyntaxChildren iteration
SyntaxChildren.Iterator stops the first time it sees a nil child;
since it traverses all indexes without considering presence, this
causes it to terminate iteration early if there is a missing child
in the list.
* [SwiftSyntax] Add tests for SyntaxChildren
* Create Swift libSyntax API
This patch is an initial implementation of the Swift libSyntax API. It
aims to provide all features of the C++ API but exposed to Swift.
It currently resides in SwiftExperimental and will likely exist in a
molten state for a while.
* Only build SwiftSyntax on macOS
