[Beta] Tinkering with Pythonista's internals using objc_util

filippocld223

Thanks

omz

@JonB Quick tip: UIView has a built-in recursiveDescription method that produces a tree-like representation of all subviews.

filippocld

Oh, that's the most useful thing i've ever seen :O

nfmusician

Understanding this is for experimentation only, how would one go about modifying OMPythonSyntaxHighlighter or making a custom syntax highlighter class?

cvp

@nfmusician I don't know anything about NSRegularExpression, but, only for testing, a little modif in @omz code → Code Editor Demo.py (Gist)

allows to change rule for Python comment, from #xxxx into &xxxx

		editor_view = OMTextEditorView.alloc().initWithFrame_syntaxHighlighterClass_theme_(f, SyntaxHighlighter, theme)

		# ============= begin
		# https://forum.omz-software.com/topic/2014/beta-tinkering-with-pythonista-s-internals-using-objc_util/12				
		rules = editor_view.syntaxHighlighter().syntaxHighlightingRules()
		for rule in rules:
			print(rule.scopeName())
			if rule.regex():
				print('   NSRegularExpression pattern=',rule.regex().pattern())
				if str(rule.scopeName()) == 'comment':
					#print(dir(rule))
					comment_pattern = rule.regex().pattern()
					comment_pattern = ns(str(comment_pattern).replace('#','&'))
					comment_options = rule.regex().options()
					regex_new = ObjCClass('NSRegularExpression').alloc().initWithPattern_options_error_(comment_pattern, comment_options, None)
					rule.setRegex_(regex_new)
					print('   NSRegularExpression pattern=',rule.regex().pattern())
		print(dir(rule))
		# ============= end

cvp

@nfmusician still only for testing: how to modify color of a rule, here the comment

		PA2UITheme = ObjCClass('PA2UITheme')
		theme_dict = PA2UITheme.sharedTheme().themeDict().mutableCopy()
		theme_dict.autorelease()
		theme_dict['font-family'] = 'Menlo-Regular'
		theme_dict['font-size'] = 14
		# ============= begin
		#print(theme_dict)
		new_theme_dict = {}
		for x in theme_dict.allKeys():
			#print(x._get_objc_classname(),x)
			if str(x) == 'scopes':
				new_dict_scopes = {}
				for y in theme_dict[x].allKeys():
					#print(' ',y._get_objc_classname(),y)
					if str(y) == 'comment':
						new_dict_comment = {}
						for z in theme_dict[x][y].allKeys():
							#print(' ','-',z._get_objc_classname(),z)
							if str(z) == 'color':
								new_dict_comment[z] = "#DC7633"	# new color
							else:
								new_dict_comment[z] = theme_dict[x][y][z]
						new_dict_scopes[y] = new_dict_comment
					else:
						new_dict_scopes[y] = theme_dict[x][y]
				new_theme_dict[x] = new_dict_scopes
			else:
				new_theme_dict[x] = theme_dict[x]
		theme_dict = new_theme_dict
		#print(theme_dict)
		# ============= end
		theme = OMSyntaxHighlighterTheme.alloc().initWithDictionary_(theme_dict)
		theme.autorelease()

ccc

Is there a way to mark Python syntax errors like print “Hello World” in blinking red?

cvp

@ccc It is only an editor, thus it does not check anything about Python rules. At least' that's what I think. For instance, it recognizes Python reserved words but that's all

cvp

@ccc Is that not what Analyze (pyflakes) tool does?

ccc

It is a difference between active and passive. The Pythonista editor is passive because I have to manually run pyflakes while VSCode is active because it updates the syntax highlighting as I type by running flake8. Given the speed of current iOS CPUs, active syntax highlighting might have acceptable performance.

cvp

@ccc Ok, I understand but I wanted to say in my answer is that current Pythonista Editor does not allow to intercept at typing, it only checks content with some easy rules.

cvp

@ccc Upon reflection, I think that it should be possible, via the delegate of the editor's TextView, to intercept the modifications of the source and to execute a code, like flak8, to check the syntax of the script. But it seems to be quite complex

ccc

It would not need be letter-by-letter, but it would be cool if fixers like "isort ; black ; pyupgrade ----py37-plus" were autorun on the code in the editor. The trick would be for the fixers to fail gracefully if the user is in mid-thought.

cvp

@ccc Agree but this kind of particular process in the Pythonista Editor should be for @omz only, don't you think so? And, sincerely, I don't have any hope for such functionality