In order to do something useful with the language, actions can be attached to grammar elements in the grammar. If there are no syntax errors, the default action is to simply exit without printing any message. ANTLR provides a single consistent notation for specifying lexers, parsers, and tree parsers.īy default, ANTLR reads a grammar and generates a recognizer for the language defined by the grammar (i.e., a program that reads an input stream and generates an error if the input stream does not conform to the syntax specified by the grammar). Parsers can automatically generate parse trees or abstract syntax trees, which can be further processed with tree parsers. ![]() ĪNTLR can generate lexers, parsers, tree parsers, and combined lexer-parsers. A language is specified using a context-free grammar expressed using Extended Backus–Naur Form (EBNF). While Version 3 supported generating code in the programming languages Ada95, ActionScript, C, C#, Java, JavaScript, Objective-C, Perl, Python, Ruby, and Standard ML, the current release at present only targets Java, C#, C++, JavaScript, Python, Swift, and Go. ![]() ![]() ANTLR takes as input a grammar that specifies a language and generates as output source code for a recognizer of that language.
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