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Lecture 14

Lecture 14, Tue 11/21

Parsing lab overview

Github repo for today:

• https://github.com/pconrad/parsing-starter-01-LECTURE-11.21.17

What we are doing today:

• Going over what you need to understand for the parsing lab (lab08) by:
• Doing an alternative change to the arithmetic expression parser, namely, adding the % operator (with same precedence as * and /)

This will give you SOME of what you need for the parsing lab.

• It will not give you all of it.
• BY DESIGN, some of the parts you have to figure out on your own
• Specifically: there are several places where there are at least two possible designs, neither of which is clearly better than the other.
  • One token type with variations for relational operator? A base class extended several times? An interface? Separate token types with no class or interface relationship?
  • Tokens for multi-character operators: new type? Or change the base type of operator scaffold to wrap a String instead of a char?