January 2013
Intermediate to advanced
328 pages
8h 5m
English
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Chapter 7Decoupling Grammars from Application-Specific Code
Now that we know how to formally define languages using ANTLR grammar syntax, it’s time to breathe some life into our grammars. By itself, a grammar isn’t that useful because the associated parser tells us only whether an input sentence conforms to a language specification. To build language applications, we need the parser to trigger specific actions when it sees specific input sentences, phrases, or tokens. The collection of phrase → action pairs represents our language application or at least the interface between the grammar and a larger surrounding application.
In this chapter, we’re going to learn how to use parse-tree listeners and visitors to build language applications. ...
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