[ios, macos] Insert example code in original headers (#7569)

* [ios, macos] Removed extraneous code fences

* [ios] Streamlined example delimiters

Use test method names as names of example blocks and test method documentation comments as front matter for examples. Set off example blocks using a syntax similar to playground markup syntax. Avoid hard-coding indentation levels. Trigger Xcode build error when an error occurs in the script.

* [ios] Removed platform-specific code from examples

* [ios] Fixed logic error

The comment said 200 while the code said 1,500.

* [ios] Formalize build phase input

* [ios] Insert examples into original source documentation

Rewrote the example code insertion script to work on the original source files and overwrite any existing code examples on the same symbols. The script uses SourceKitten to find the documentation comment for the symbol named by the test method.

Replaced the Run Script build phase that runs the example code insertion script with a make rule that runs the same script. Inlined skeleton examples minus the contents of the code blocks.

* [ios] Fixed syntax error

* [ios] Ran ios-add-examples-to-docs

* [ios] Avoid touching unchanged headers

* [ios] Refactored example insertion script

* [ios] Point jazzy at original sources

* [ios] Invoke SourceKitten only once

* [ios] Look for methods as well as properties

* [ios] Thoroughly search for code blocks in doc comments

Refactored the example code insertion script to index test methods by their names, then recursively search the SourceKitten output for documentation comments that contain Swift code blocks, replacing each code block with the associated test method body.

* [ios, macos] Enabled example insertion for macOS

The example code insertion script is now platform-agnostic.

* [ios, macos] Fixed documentation example tests

Set the map view’s style to a minimal local JSON file. Wait for the style to finish loading before running each test. Corrected CGVector type.

* [ios, macos] Dry run mode

The output of this mode isn’t a good indicator of whether any files would’ve needed to be changed, because the presence of a conditional compilation block in one of the test methods means this script would always change and revert the corresponding comment.

* [ios] Fixed test failure

The iOS implementation of MGLMapView tries to show the Streets style by default even if no access token has been set. Avoid a race condition and frequent test failure by specifying the minimal style on initialization.

* [ios, macos] Ensure SourceKitten is installed before inserting example code

* [ios, macos] Tear down map view after each test

Keep map views from previous tests from hanging around, potentially obscuring the result of a subsequent test. Set the access token to a bogus token upfront for all style layer tests. Unified MGLStyle usage within MGLStyleTests.

* [ios, macos] Reinsert examples after generating runtime styling headers

1 files changed, 4 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 29acc367f4..b1ceeb74b6 100644
--- a/Makefile
+++ b/Makefile
@@ -275,6 +275,10 @@ idocument:
 
 style-code-darwin:
 	node platform/darwin/scripts/generate-style-code.js
+	node platform/darwin/scripts/update-examples.js
+
+darwin-update-examples:
+	node platform/darwin/scripts/update-examples.js
 endif
 
 #### Linux targets #####################################################