add complex test

tests/complex/CMakeLists.txt

@@ -0,0 +1,40 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+project(CPMTest)
+
+include(${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME LHC
+  GIT_REPOSITORY https://github.com/TheLartians/LHC.git
+  VERSION 0.3
+)
+
+CPMAddPackage(
+  NAME LarsEvent
+  GIT_REPOSITORY https://github.com/TheLartians/Event.git
+  VERSION 1.0
+)
+
+# Add project that depends on previous project
+CPMAddPackage(
+  NAME LarsParser
+  GIT_REPOSITORY https://github.com/TheLartians/Parser.git
+  VERSION 1.2
+)
+
+# add project twice
+CPMAddPackage(
+  NAME LHC
+  GIT_REPOSITORY https://github.com/TheLartians/LHC.git
+  VERSION 0.3
+)
+
+# add executable
+set (CMAKE_CXX_STANDARD 17)
+add_executable(cpm-test test.cpp)
+target_link_libraries(cpm-test LHC LarsEvent LarsParser)
+
+# tests
+enable_testing()
+add_test(cpm-test cpm-test)

tests/complex/test.cpp

@@ -0,0 +1,32 @@
+#include <lars/parser_generator.h>
+#include <lars/event.h>
+
+int main() {
+  // Define the return value
+  int result = 1;
+
+  // Define grammar and evaluation rules
+  lars::ParserGenerator<float> g;
+  g.setSeparator(g["Whitespace"] << "[\t ]");
+  g["Sum"     ] << "Add | Subtract | Product";
+  g["Product" ] << "Multiply | Divide | Atomic";
+  g["Atomic"  ] << "Number | '(' Sum ')'";
+  g["Add"     ] << "Sum '+' Product"    >> [](auto e){ return e[0].evaluate() + e[1].evaluate(); };
+  g["Subtract"] << "Sum '-' Product"    >> [](auto e){ return e[0].evaluate() - e[1].evaluate(); };
+  g["Multiply"] << "Product '*' Atomic" >> [](auto e){ return e[0].evaluate() * e[1].evaluate(); };
+  g["Divide"  ] << "Product '/' Atomic" >> [](auto e){ return e[0].evaluate() / e[1].evaluate(); };
+  g["Number"  ] << "'-'? [0-9]+ ('.' [0-9]+)?" >> [](auto e){ return stof(e.string()); };
+  g.setStart(g["Sum"]);
+
+  // Execute a string
+
+  // create an event
+  lars::Event<float> onResult;
+  onResult.connect([&](float v){ result = !(int(v) == 5); });
+  
+  // emit the result of a parsed string
+  onResult.notify(g.run("1 + 2 * (3+4)/2 - 3"));
+
+  // return the result
+  return result;
+}