From c6ad2948bb98d42f8e0883ef82cd14cd2d5eda60 Mon Sep 17 00:00:00 2001
From: Patrick Schönberger
Date: Sat, 14 Aug 2021 14:56:12 +0200
Subject: add antlr source code and ReadMe

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 antlr4-cpp-runtime-4.9.2-source/demo/README.md | 13 +++++++++++++
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 create mode 100644 antlr4-cpp-runtime-4.9.2-source/demo/README.md

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diff --git a/antlr4-cpp-runtime-4.9.2-source/demo/README.md b/antlr4-cpp-runtime-4.9.2-source/demo/README.md
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+## Demo application for the ANTLR 4 C++ target
+
+This demo app shows how to build the ANTLR runtime both as dynamic and static library and how to use a parser generated from a simple demo grammar.
+
+A few steps are necessary to get this to work:
+
+- Download the current ANTLR jar and place it in this folder.
+- Open the generation script for your platform (generate.cmd for Windows, generate.sh for *nix/OSX) and update the LOCATION var to the actual name of the jar you downloaded.
+- Run the generation script. This will generate a test parser + lexer, along with listener + visitor classes in a subfolder named "generated". This is where the demo application looks for these files.
+- Open the project in the folder that matches your system.
+- Compile and run.
+
+Compilation is done as described in the [runtime/cpp/readme.md](../README.md) file.
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