[feature] Implement a Real Interpreter

[gaocegege]

/priority p3
/kind feature

We implement a simple interpreter based on the string comparison, which is not robust. We need to implement a real one.

[gaocegege]

/assign

[gaocegege]

I want to use goyacc to generate a parser for the interpreter.

[ddysher]

we need to first define our language...

[gaocegege]

Sure.

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