build_phase.rb is missing a PBXAppleScriptBuildPhase class (unknown ISA for AppleScript build phases)

[jn-nyc]

Summary

lib/xcodeproj/project/object/build_phase.rb defines classes for the standard
build-phase ISAs — PBXHeadersBuildPhase, PBXSourcesBuildPhase,
PBXFrameworksBuildPhase, PBXResourcesBuildPhase, PBXCopyFilesBuildPhase,
PBXShellScriptBuildPhase, PBXRezBuildPhase — but there is no
PBXAppleScriptBuildPhase.

Xcode does emit PBXAppleScriptBuildPhase objects (targets that compile/run
AppleScript). Because the class is absent, xcodeproj cannot represent this
build phase, and opening or re-saving any .pbxproj that contains one is
unreliable.

Expected

PBXAppleScriptBuildPhase is a first-class AbstractBuildPhase subclass, so
projects containing AppleScript build phases round-trip cleanly.

Actual

The ISA is unknown to xcodeproj. Consumers have to monkey-patch the gem after
every install/update to add the class, e.g.:

class PBXAppleScriptBuildPhase < AbstractBuildPhase
  attribute :contextName, String, ''
  attribute :isSharedContext, String, '0'
end

Suggested fix

Add a PBXAppleScriptBuildPhase < AbstractBuildPhase class to
build_phase.rb with its contextName and isSharedContext string
attributes, alongside the other phase classes.

Environment

• xcodeproj: 1.28.1
• Ruby: 2.6.0 (system Ruby, macOS)