June 2018
Intermediate to advanced
280 pages
7h 46m
English
Content preview from Design Patterns and Best Practices in Java
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Interpreter
The interpreter's grammar can be stored as a map of keywords with the corresponding action stored as a value. In Chapter 2, Creational Patterns, we used a mathematical expression evaluator that accumulates the result in a stack. This can be implemented by having the expressions stored in a map and accumulate the result by using reduce:
jshell> Map<String, IntBinaryOperator> operands = Map.of("+", (x, y) -> x + y, "-", (x, y) -> x - y)operands ==> {-=$Lambda$208/1259652483@65466a6a, +=$Lambda$207/1552978964@4ddced80}jshell> Arrays.asList("4 5 + 6 -".split(" ")).stream().reduce("0 ",(acc, x) -> {...> if (operands.containsKey(x)) {...> String[] split = acc.split(" ");...> System.out.println(acc);...> acc = split[0] + " " + operands.get(x).applyAsInt(Integer.valueOf(split[1]), ...Become 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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