Tag: lua

# Lua Rocks

Inspired by reading , specifically the section on using fallbacks to implement an expression parser, I wanted to see if I could do so in a safe manner. With safe meaning parsed expressions must not be able to execute arbitrary code.

Half an hour later, I have to say it is surprisingly easy! Less than 50 lines (including comments) is all it takes:

function parse(expression)
local op, create

-- Calculate each subexpression at most once, otherwise just return the cached
-- result. Note that this is not clever enough to take advantage of
-- commutativity, i.e …

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