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Basic results from automata theory tell us that the language L = an bn cn = epsi , abc, aabbcc, aaabbbccc, . . .
Basic results from automata theory tell us that the language L an bn cn epsi abc, aabbcc, aaabbbccc, is not context free. It can be captured, however, using an attribute grammar. Give an underlying CFG and a set of attribute rules that associates a Boolean attribute ok with the root R of each
Exercises
Chapter SemanticAnalysis
cdr
quote
cepsi
Natural syntax tree for the Lisp expression cdr a b c
a
b
Figure
epsi
epsi
parse tree, such that Rok true if and only if the string corresponding to the fringe of the tree is in L
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