live/examples/stm2java.egl

[*Generates a Java class from a state machine*]
public class App {
	
	public static void main(String[] args) {
		App app = new App();
		
		// The statement below will succeed
		app.process("AABC"); 
		
		// The statement below will fail because
		// there is no transition from A to C
		// in the state machine
		app.process("ACB"); 
	}
	
	[*Generate an entry process() method*]
	public void process(String str) {
		if (str.isEmpty()) return;
		
		[%for(s in State.all){%]
		if (str.charAt(0) == '[%=s.name%]') {
			state[%=s.name%](str.substring(1));
			return;
		}
		[%}%]
		
		throw new IllegalStateException();
	}

	[*Generate a method for every state*]
	[%for (s in State.all){%]
	public void state[%=s.name%](String str) {
		if (str.isEmpty()) return;
		
		[%for(t in s.outgoing){%]
		if (str.charAt(0) == '[%=t.to.name%]') {
			state[%=t.to.name%](str.substring(1));
			return;
		}
		[%}%]
		
		throw new IllegalStateException();
	}
	
	[%}%]

}