August 2015
Intermediate to advanced
216 pages
4h 50m
English
Content preview from Clojure Data Structures and Algorithms CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Building a recursive descent parser using trampoline
A recursive descent parser, as the name implies, makes heavy use of recursion in order to process some input tokens and be able to tell if they comply with a particular grammar code. For each of the grammar rules, such a parser will have to fire a function that proceeds with the verification of the input according to this very rule.
Let's consider, for the purposes of this recipe, a very simple grammar code: one that allows describing the structure of a symbolic expression that is very broadly speaking a set of elements confined between parentheses:
S = sexp
sexp = "(" element* ")"
element = term | sexp
term = [a-zA-Z0-9]*'Our parser recognizes as valid structures those which are symbolic expressions, ...
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