Abbreviations used in this code
Some of them are very common
Others aren't

allocr - allocator
arg - argument
cap - capacity
cont - continue
ctx - context
decl - declaration
del - delete
deref - dereference
direct - directive
eof - end of file
err - error
eval - evaluate
evalr - evaluator
expr - expression
fn - function
ident - identifier
inc - include
init - initialization
kw - keyword
lbl - label
len - length
nms - namespace
num - number
op - operator
param - parameter
ptr - pointer
ret - return
stmt - statement
str - string
tokr - tokenizer
val - value