How to insert/use Epsilon?

[evandrocoan]

I can just insert ε or is there another symbol for it?

S -> ε   | b I | a P | a.
P -> a P | b I | a.
I -> a I | b P | b.

[mdaines]

There is no explicit epsilon symbol in the master branch. So you would write this:

S -> | b I | a P | a .

The syntax branch adds a special #epsilon symbol:

https://github.com/mdaines/grammophone/blob/823d927e91a3a62d1e23f4b45c034514b76f421d/test/parsing-test.js#L76

[evandrocoan]

Thanks, took me some time to realize you had did S -> |

S ->     | b I | a P | a.
P -> a P | b I | a.
I -> a I | b P | b.

Can I use a colon instead of a dot to end lines:

S ->     | b I | a P | a;
P -> a P | b I | a;
I -> a I | b P | b;

Or can the line just be ended by the new line \n character?

S ->     | b I | a P | a
P -> a P | b I | a
I -> a I | b P | b

[mdaines]

In the syntax branch, you can do both of those things.

https://github.com/mdaines/grammophone/blob/syntax/test/parsing-test.js

[mdaines]

I've added this to master in da2b67bc41531597eeca1b4dad586ea28d88e81d.

[evandrocoan]

Thanks! I merged locally the changes and they are working great!