Generate an Antlr4 parser for a given target language
Generate a parser application using the Antlr tool and application templates.
The generated parser is placed in the directory /Generated-/.
If there is a desc.xml file in the current directory, trgen will read
it for information on testing the grammar. If there is no desc.xml file,
the start rule must be provided. If the current directory is empty, trgen will
create a parser for the Arithmetic.g4 grammar.
trgen <options>*
trgen
The desc.xml is an XML file that specifies how to generate a driver and test a grammar. The desc.xml is similar to the Antlr Maven Tester pom.xml file, but with a few extension. trgen analyzes the grammar to determine how to test the grammar; this analysis simplifies the information needed in the desc.xml that would be required in the pom.xml.
A typical desc.xml simply specifies all targets to test.
<?xml version="1.0" encoding="UTF-8" ?>
<desc xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../_scripts/desc.xsd">
<targets>Antlr4cs;Antlr4ng;Cpp;CSharp;Dart;Go;Java;JavaScript;PHP;Python3;TypeScript</targets>
</desc>
trgen will read all .g4's contained in the directory with the desc.xml file.
It computes a dependency graph of the grammars used via tokenVocab options,
and import statements. The tool will then perform a topological sort, determine
the first "top-level" parser or combined grammar, and use that grammar for testing.
The start rule for the driver for testing will be determined by looking for the
first EOF-terminated rule. With these two analyses, the desc.xml eliminates the
need to specify information that is required in the pom.xml, and helps to greatly
simplify and eliminate bugs created when adding new grammars.
0.23.8 Fixed #494, #496, #497.
The MIT License
Copyright (c) 2024 Ken Domino
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