Lexicon Calculator

[inner blaze]

hey guys, i was trying to build a lexicon follwoing this tutotiral, while I was developing my tokening function they wrote this following line of code as the tokeniser detects each char typed:

while (expression.hasNext()) { 
    final Character currentChar = getValidNextCharacter(expression);
}

however there was no previous mention of the function ever described on the webpage: https://www.baeldung.com/java-lexical-analysis-compilation

I'm suspecting that this function was already written in the code and was named something else but I was under the assumption Gram had already taken care of this part. please help, here's a full context of the code Id dhave written so far:

[sleek lotus]

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[sleek lotus]

Please format your code to make it more readable.
For java, it should look like this:
```​​​`​java
public void foo() {

}
​​​`​```

[sleek lotus]

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[somber trout]

i think it just uses the next() method

from the expression