Delphi language features

Here is incomplete Delphi/Object Pascal feature tree. Some features are dependent on others so some have precedence during compiler development.

Name	Description	Level
Statements		0
Variables	var keyword, global	0
Variables - Local	Inside function and procedures
Constants	const keyword, global	0
Name spaces	Not directly supported	Future
Memory access	Direct access to memory (pointers, directive absolute)
Compiler directives
Compiler directives - Conditionals	$IFDEF, $ENDIF, $DEFINE, ...)
Compiler directives - Region	code hiding using $REGION
Compiler directives - Options	($M+/-, ...)
Operators	and, or, xor, not, +, -, /, *, div, mod	0
Operators - Shifting	shl, shr
Operators - Type	as, in
Expressions	operator priority, infix notation	0
Expressions - Parentheses		1
Assignment	:= symbol	0
Integrated assembler	asm-end
Comments	One line // or Block level {}, (* *)
Functions	Functions and procedures	0
Functions - Overloading	Function overloading, overload keyword
Functions - Nested	Local functions inside function
Functions - Parameters
Functions - Parameters - Reference	var keyword for references
Functions - Parameters - Default value	parameters with default value
Functions - Inlined	Inlining code using inline keyword
Types	type keyword	0
Types - Enumeration	(Boolean, ...)
Types - Subrange	(0..100, ...)
Types - Ordinals	SmallInt, Byte, Integer, Word, Cardinal, Int64, ...	0
Types - Floating numbers	Real, Single, Double, Extended, ...
Types - Characters	Char, WideChar, AnsiChar, ...
Types - Strings	String, ShortString, AnsiString, WideString, PChar, ...
Types - Pointers	Pointer, @, ^
Types - Variant
Types - Procedural types
Types - Composed
Types - Array	static/dynamic
Types - Record
Types - Record - Variant	Překrývání proměnných (variant records): case Integer of...
Types - Record - Packed
Types - Record - Operator redefinition
Types - Record - Advanced	with constants,types,variables,procedure/functions
Types - Set	set of, in operator, [] as set initializer
Types - Class	class keyword
Types - Class - Visibility	published, public, private, protected
Types - Class - Methods	Methods (procedure, function)
Types - Class - Virtual methods	(virtual, override)
Types - Class - Inlining	inline
Types - Class - Inheritance	inherited
Types - Class - Properties	(property, read, write, default, indexed)
Types - Class - Nested definitions
Types - Class - Constructors and destructors	constructor, destructor
Types - Interface	interface keyword
Globals	(variables, constants, types, functions)
Units	Modularity using unit keyword, interface and implementation sections
Units - Types	program, unit, package, library
Units - Initialization/Finalization	(initialization, finalization)
Controls structures
Condition	(if-then-else)
Loop with known cycle count	for-to-do
Repeat loop	repeat-until
While loop	while-do
Loop exit	break
Loops - Continue	Jump to next iteration (continue)
Compound statement	begin-end
Multiple branching	case-of
Context change	with-do
Exceptions		raise (raise)
Exceptions - handling	try-except
Exceptions - Finalization	try-finally
Loop with enumerators	for-in-do
Generics	Parametric types
Generics - Constraints	Limit generics parameters to class, record, ordinal, float, ...
Translation strings	resourcestring keyword
Multi-threading
Multi-threading - Thread local variables	threadvar keyword
Interfaces	like abstract classes, multiple inheritance
Interfaces - Reference counting
Memory manager	Automatic memory management
File types	file, text	Obsolete
Direct jump	goto, label keywords	Obsolete