Antlr options output ast

Antlr options output ast

By: supostar Date of post: 14.06.2017

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Visual AST for ANTLR Generated Parser Output - CodeProject

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Given the raw AST of a grammar, create a grammar object associated with the AST. To process a grammar, we load all of its imported grammars into subordinate grammar objects.

Then we merge the imported rules into the root grammar. If a root grammar is a combined grammar, we have to extract the implicit lexer.

Once all this is done, we process the lexer first, if present, and then the parser grammar. Important enough to avoid multiple definitions that we do very early, right after AST construction.

c - How to output the AST built using ANTLR? - Stack Overflow

Return true if we find multiple definitions of the same rule or a reference to an undefined rule or parser rule ref in lexer rule. Once we have the grammar object, ensure that all nodes in tree referred to this grammar.

Later, we will use it for error handling and generally knowing from where a rule comes from. Convenience method to load and process an ANTLR grammar. Useful when creating interpreters.

antlr options output ast

If you need to access to the lexer grammar created while processing a combined grammar, use getImplicitLexer on returned grammar. This method is used by all code generators to create new output files.

If the outputDir set by -o is not present it will be created. The final filename is sensitive to the output directory and the directory where the grammar file was found. The output dir -o spec takes precedence if it's absolute.

If no -o is specified, then just write to the directory where the grammar file was found. Return the location where ANTLR will generate output files for a given file. This is a base directory and output files will be relative to here in some cases such as when -o option is used and input files are given relative to the input directory.

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