September 2014
Intermediate to advanced
320 pages
10h 23m
English
Content preview from Functional Programming in Scala
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Chapter 9. Parser combinators
In this chapter, we’ll work through the design of a combinator library for creating parsers. We’ll use JSON parsing (http://mng.bz/DpNA) as a motivating use case. Like chapters 7 and 8, this chapter is not so much about parsing as it is about providing further insight into the process of functional design.
What is a parser?
A parser is a specialized program that takes unstructured data (such as text, or any kind of stream of symbols, numbers, or tokens) as input, and outputs a structured representation of that data. For example, we can write a parser to turn a comma-separated file into a list of lists, where the elements of the outer list represent the records, and the elements of each inner list represent ...
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