A parse tree (aka. parsing tree or concrete syntax tree) is an ordered, rooted tree that represents the syntactic structure of a string according to some context-free grammar.

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In this post we are going to see how process and transform the information obtained from the parser. The ANTLR parser recognizes the elements present in the source code and build a parse tree. From the parse tree we will obtain the Abstract Syntax Tree which we will use to perform validation and produce compiled code.