enh(swift) highlight function and macro call usage

[bradleymackey]

Improve fidelity by highlighting function calls in addition to definitions. This is already done by javascript, for example.

Before	After

Changes

• Add negativeLookahead helper to lib/regex
• Highlight all function and method calls as title.function (e.g. myFunction(), obj.myFunction()).
• Highlight all freestanding macro calls as title.function (e.g. #myMacro()).
• There can be >=0 whitespace between the end of the function name and the parentheses, but newlines are not permitted. Encapsulate this in a new regex, TRAILING_PAREN_REGEX
• Built-ins still highlight as such but with exceptions for methods–where they are semantically no longer builtins.
• Most keywords can exist as both properties and methods (e.g. obj.if()). Highlight keyword method calls also.
  • Number sign keywords and attribute keywords are permitted as raw functions, as they start with leading # and @ respectively. If they don't start with these, they're no longer considered reserved.
• Highlight escaped function name calls also (e.g. `myFunc`()). This feature exists so that reserved words can be used as identifiers.
• Variable accesses (e.g. obj.myVariable) remain unhighlighted for now.
• Add markup tests for all the cases and edge cases described.

Next Steps (for a future PR)

• Support trailing closures, which are method calls: exampleCall { print("action") }

Checklist

• Added markup tests
• Updated the changelog at CHANGES.md

[github-actions]

Build Size Report

Changes to minified artifacts in /build, after gzip compression.

4 files changed

Total change +241 B

View Changes

file	base	pr	diff
es/core.min.js	8.17 KB	8.17 KB	+1 B
es/highlight.min.js	8.17 KB	8.17 KB	+1 B
es/languages/swift.min.js	3.55 KB	3.67 KB	+120 B
languages/swift.min.js	3.56 KB	3.68 KB	+119 B

[github-actions]

Build Size Report

Changes to minified artifacts in /build, after gzip compression.

3 files changed

Total change +231 B

View Changes

file	base	pr	diff
es/languages/swift.min.js	3.55 KB	3.67 KB	+116 B
highlight.min.js	8.21 KB	8.21 KB	-1 B
languages/swift.min.js	3.56 KB	3.68 KB	+116 B

[github-actions]

Build Size Report

Changes to minified artifacts in /build, after gzip compression.

5 files changed

Total change +241 B

View Changes

file	base	pr	diff
es/core.min.js	8.17 KB	8.17 KB	+1 B
es/highlight.min.js	8.17 KB	8.17 KB	+1 B
es/languages/swift.min.js	3.55 KB	3.67 KB	+120 B
highlight.min.js	8.21 KB	8.21 KB	-1 B
languages/swift.min.js	3.56 KB	3.68 KB	+120 B

[github-actions]

Build Size Report

Changes to minified artifacts in /build, after gzip compression.

5 files changed

Total change +207 B

View Changes

file	base	pr	diff
es/core.min.js	8.17 KB	8.18 KB	+2 B
es/highlight.min.js	8.17 KB	8.18 KB	+2 B
es/languages/swift.min.js	3.55 KB	3.65 KB	+101 B
highlight.min.js	8.21 KB	8.21 KB	+2 B
languages/swift.min.js	3.56 KB	3.66 KB	+100 B

[joshgoebel]

We can't use negative lookahead until v12 though because it's a breaking change. And I don't have a timetable on that yet.

[bradleymackey]

@joshgoebel This is an adapted version of Javascript's implementation which is already using negative lookahead ( see here). My understanding was that only lookbehind is not allowed currently.

[github-actions]

Build Size Report

Changes to minified artifacts in /build, after gzip compression.

5 files changed

Total change +207 B

View Changes

file	base	pr	diff
es/core.min.js	8.17 KB	8.17 KB	+2 B
es/highlight.min.js	8.17 KB	8.17 KB	+2 B
es/languages/swift.min.js	3.55 KB	3.65 KB	+101 B
highlight.min.js	8.2 KB	8.21 KB	+2 B
languages/swift.min.js	3.56 KB	3.66 KB	+100 B

[bradleymackey]

@joshgoebel Is there a way forward for this PR? If the concern is a language-specific breaking change, the Swift language itself is already using negative lookahead as well, here.