AI decompiler based on heuristic rules

PHP 7 is required (Windows executables are bundled).

Supports:

• GF
• AdvExt GF/GE
• HF - thanks to Eressea
• GD - thanks to @ChaosPaladin
• C1 - thanks to @MasterToma
• Freya is not supported yet

To run copy ai.obj to current folder & run:

$ php core/main.php
...

Or just run ./run.bat on Windows.

See decompiled code in ai directory.

Command line options

--config        Path to JSON configuration file. Default: NULL
--input         Path to AI file to decompile. Default: 'ai.obj'
--output        Path to result file/directory. Default: NULL
--chronicles    AI chronicles. Provide a directory name from the data directory. Default: NULL
--language      Result language. Provide a file name from the core/generators directory (without .php extension). Default: 'nasc'
--tree          Split result in tree structure. Provide a tree depth (0 - don't split, 1 - flat, more than 3 can cause problems on Windows). Default: 3
--join          Join split classes into one file. Provide path to a directory which contains the classes.txt file. Default: NULL
--utf16le       Encode output in UTF-16LE instead of UTF-8. NASC Compiler supports only UTF-16LE. Default: false
--test          Run regression tests. Provide a test file name from the tests directory (without .bin extension). Default: NULL
--generate      Generate regression tests. Provide a new test file name (without extension). Default: NULL
--ignore        Comma-separated list of ignored classes. Default: NULL

Usage examples

Don't split in tree structure:

./run.bat --input=gf_off.obj --tree=0

Join classes & convert to UTF16-LE for NASC Compiler:

./run.bat --join=gf_off --utf16le=1

Decompiled code example

VM code:

class 0 hello : (null)

handler 3 23	//  TALKED
	variable_begin
		"i0"
		"talker"
		"myself"
		"_choiceN"
		"_code"
		"_from_choice"
	variable_end

	push_event	//  i0
	push_const 280			//i0
	add
	fetch_i
	branch_false L1
L0
	push_event	//  myself
	push_const 784			//Say
	add
	fetch_i			//Say
S0.	"Hello "
	push_string S0
	push_event	//  talker
	push_const 40			//talker
	add
	fetch_i			//name
	push_const 164			//name
	add
	add_string 1028
	func_call 234946622	//  func[Say]
	shift_sp -1
	shift_sp -1
L1
handler_end

class_end

Decompiled code:

set_compiler_opt base_event_type(@NTYPE_NPC_EVENT)

class hello {
handler:
	EventHandler TALKED(i0, talker) {
		if (i0) {
			Say("Hello " + talker.name);
		}
	}
}