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+# CMake Antlr4 Package Usage
+
+## The `antlr4-generator` Package
+
+To use the Package you must insert a
+```cmake
+find_package(antlr4-generator REQUIRED)
+```
+line in your `CMakeList.txt` file.
+
+The package exposes a function `antlr4_generate` that generates the required setup to call ANTLR for a
+given input file during build.
+
+The following table lists the parameters that can be used with the function:
+
+Argument# | Required  | Default | Use
+----------|-----------|---------|---
+0 | Yes | n/a | Unique target name. It is used to generate CMake Variables to reference the various outputs of the generation
+1 | Yes | n/a | Input file containing the lexer/parser definition
+2 | Yes | n/a | Type of Rules contained in the input: LEXER, PARSER or BOTH
+4 | No  | FALSE | Boolean to indicate if a listener interface should be generated
+5 | No  | FALSE | Boolean to indicate if a visitor interface should be generated
+6 | No  | none | C++ namespace in which the generated classes should be placed
+7 | No  | none | Additional files on which the input depends
+8 | No  | none | Library path to use during generation
+
+The `ANTLR4_JAR_LOCATION` CMake variable must be set to the location where the `antlr-4*-complete.jar` generator is located. You can download the file from [here](http://www.antlr.org/download.html).
+
+Additional options to the ANTLR4 generator can be passed in the `ANTLR4_GENERATED_OPTIONS` variable. Add the installation prefix of `antlr4-runtime` to `CMAKE_PREFIX_PATH` or set
+ `antlr4-runtime_DIR` to a directory containing the files.
+
+The following CMake variables are available following a call to `antlr4_generate`
+
+Output variable  | Meaning
+---|---
+`ANTLR4_INCLUDE_DIR_<Target name>`       | Directory containing the generated header files
+`ANTLR4_SRC_FILES_<Target name>`         | List of generated source files
+`ANTLR4_TOKEN_FILES_<Target name>`       | List of generated token files
+`ANTLR4_TOKEN_DIRECTORY_<Target name>`  | Directory containing the generated token files
+
+#### Sample:
+```cmake
+ # generate parser with visitor classes.
+ # put the classes in C++ namespace 'antlrcpptest::'
+ antlr4_generate(
+   antlrcpptest_parser
+   ${CMAKE_CURRENT_SOURCE_DIR}/TLexer.g4
+   LEXER
+   FALSE
+   TRUE
+   "antlrcpptest"
+   )
+```
+
+**Remember that the ANTLR generator requires a working Java installation on your machine!**
+
+## The `antlr4-runtime` Package
+
+To use the Package you must insert a
+```cmake
+find_package(antlr4-runtime REQUIRED)
+```
+line in your `CMakeList.txt` file.
+
+The package exposes two different targets:
+
+Target|Use
+--|--
+antlr4_shared|Shared library version of the runtime
+antlr4_static|Static library version of the runtime
+
+Both set the following CMake variables:
+
+Output variable  | Meaning
+---|---
+`ANTLR4_INCLUDE_DIR` | Include directory containing the runtime header files
+`ANTLR4_LIB_DIR`      | Library directory containing the runtime library files
+
+#### Sample:
+```cmake
+# add runtime include directories on this project.
+include_directories( ${ANTLR4_INCLUDE_DIR} )
+
+# add runtime to project dependencies
+add_dependencies( Parsertest antlr4_shared )
+
+# add runtime to project link libraries
+target_link_libraries( Parsertest PRIVATE
+                       antlr4_shared)
+```
+
+### Full Example:
+```cmake
+ # Bring in the required packages
+ find_package(antlr4-runtime REQUIRED)
+ find_package(antlr4-generator REQUIRED)
+
+ # Set path to generator
+ set(ANTLR4_JAR_LOCATION ${PROJECT_SOURCE_DIR}/thirdparty/antlr/antlr-4.12.0-complete.jar)
+
+ # generate lexer
+ antlr4_generate(
+   antlrcpptest_lexer
+   ${CMAKE_CURRENT_SOURCE_DIR}/TLexer.g4
+   LEXER
+   FALSE
+   FALSE
+   "antlrcpptest"
+   )
+
+ # generate parser
+ antlr4_generate(
+   antlrcpptest_parser
+   ${CMAKE_CURRENT_SOURCE_DIR}/TParser.g4
+   PARSER
+   FALSE
+   TRUE
+   "antlrcpptest"
+   "${ANTLR4_TOKEN_FILES_antlrcpptest_lexer}"
+   "${ANTLR4_TOKEN_DIRECTORY_antlrcpptest_lexer}"
+   )
+
+ # add directories for generated include files
+ include_directories( ${PROJECT_BINARY_DIR} ${ANTLR4_INCLUDE_DIR} ${ANTLR4_INCLUDE_DIR_antlrcpptest_lexer} ${ANTLR4_INCLUDE_DIR_antlrcpptest_parser} )
+
+ # add generated source files
+ add_executable( Parsertest main.cpp ${ANTLR4_SRC_FILES_antlrcpptest_lexer} ${ANTLR4_SRC_FILES_antlrcpptest_parser} )
+
+ # add required runtime library
+ add_dependencies( Parsertest antlr4_shared )
+
+ target_link_libraries( Parsertest PRIVATE
+                        antlr4_shared)
+
+```
+