Packrat parsing expression library

[kwvanderlinde]

Overview

Expanding from #2, we need our parsing expressions to be automatically memoized. The basic rule of a PEG is that each expression can have at most a single expansion at any position within the input, which makes a Packrat parser ideal for this scenario.

Acceptance Criteria

• Our parser implements memoization for each expression at each input location.
• Memoization is done on an as-needed basis.
• Both failures and successes are memoized.
• Parser performance is reduced to linear time in the number of expressions and the length of input.