Important enough to avoid multiple definitions that we do very early, right after AST construction. Also check for undefined rules in parser/lexer to avoid exceptions later. 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.

Given the raw AST of a grammar, create a grammar object associated with the AST. 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.

Manually get option node from tree; return null if no defined.

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.

Parameters

fileNameWithPath:String

path to input source

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. If -o is /tmp and the original grammar file was foo/t.g4 then output files go in /tmp/foo. The output dir -o spec takes precedence if it's absolute. E.g., if the grammar file dir is absolute the output dir is given precedence. "-o /tmp /usr/lib/t.g4" results in "/tmp/T.java" as output (assuming t.g4 holds T.java). If no -o is specified, then just write to the directory where the grammar file was found. If outputDirectory==null then write a String.

Convenience method to load and process an ANTLR grammar. Useful when creating interpreters. If you need to access to the lexer grammar created while processing a combined grammar, use getImplicitLexer() on returned grammar.

Try current dir then dir of g then lib dir

Parameters

nameNode:GrammarAST

The node associated with the imported grammar name.

Since

4.7.1 in response to -Xexact-output-dir

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