From 6498a968cd34e49e355cc0765ca2dafb842bc12b Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sat, 27 Sep 2014 18:36:56 +0200
Subject: Added argument and tree export mode to frontend * arguments are
 managed through boost::program_options * default continues to be the REPL *
 "--tree" argument switches from calculation to tree export * "--input" may be
 used to pass terms to be evaluated via CLI arguments ** disables REPL

---
 CMakeLists.txt |   9 +++--
 clc.cc         | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 115 insertions(+), 14 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dabc978..763be29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ add_library(
 )
 
 add_executable(
-	test
+	tests
 	test.cc
 )
 
@@ -26,7 +26,7 @@ add_executable(
 )
 
 target_link_libraries(
-	test
+	tests
 	SimpleParser
 	gtest
 )
@@ -34,9 +34,10 @@ target_link_libraries(
 target_link_libraries(
 	clc
 	SimpleParser
+	boost_program_options
 )
 
 add_custom_command(
-	TARGET test
-	POST_BUILD COMMAND ./test
+	TARGET tests
+	POST_BUILD COMMAND ./tests
 )
diff --git a/clc.cc b/clc.cc
index 5eb0d9e..9c029e4 100644
--- a/clc.cc
+++ b/clc.cc
@@ -1,22 +1,122 @@
+#include <boost/optional.hpp>
+#include <boost/program_options.hpp>
+
 #include <iostream>
 #include <limits>
 
 #include "src/parser.h"
 
-typedef std::numeric_limits<double> dbl;
+boost::optional<boost::program_options::variables_map> input(
+	int argc,
+	char** argv
+) {
+	boost::program_options::options_description optionDescription(
+		"Supported options"
+	);
+
+	optionDescription.add_options()
+		(
+			"input",
+			boost::program_options::value<std::vector<std::string>>(),
+			"terms to be evaluated"
+		)
+		(
+			"tree",
+			boost::program_options::value<bool>()->implicit_value(true),
+			"return the binary expression tree instead of evaluating"
+		)
+	;
+
+	boost::program_options::variables_map variables;
+
+	try {
+		boost::program_options::store(
+			boost::program_options::parse_command_line(
+				argc, argv, optionDescription
+			),
+			variables
+		);
+
+		boost::program_options::notify(variables);
+	}
+	catch ( const std::exception& exception ) {
+		std::cerr << exception.what()  << std::endl;
+		std::cout << optionDescription << std::endl;
+
+		return boost::optional<boost::program_options::variables_map>();
+	}
+
+	return boost::make_optional(variables);
+}
+
+bool process(const boost::program_options::variables_map& variables) {
+	const bool replMode{ variables.count("input") == 0 };
+	const bool treeMode{ variables.count("tree") ? variables["tree"].as<bool>()
+	                                             : false };
+
+	if ( replMode ) {
+		std::cout.precision(
+			std::numeric_limits<double>::digits10
+		);
+
+		std::string term;
+
+		while ( std::cin >> term ) {
+			try {
+				if ( treeMode) {
+					std::cout << SimpleParser::print(term);
+				} else {
+					std::cout << SimpleParser::calculate(term);
+				}
+
+				std::cout << std::endl;
+			}
+			catch ( std::exception &exception ) {
+				std::cerr << exception.what() << std::endl;
+			}
+		}
+
+		return true;
+	} else {
+		const std::vector<std::string> inputTerms{
+			variables["input"].as<std::vector<std::string>>()
+		};
 
-int main() {
-	std::string inputTerm;
-	std::cout.precision(dbl::digits10);
-	
-	while ( std::cin >> inputTerm ) {
 		try {
-			std::cout << SimpleParser::calculate(inputTerm) << std::endl;
+			std::for_each(
+				inputTerms.cbegin(),
+				inputTerms.cend(),
+				[treeMode](const std::string& term) {
+					if ( treeMode) {
+						std::cout << SimpleParser::print(term);
+					} else {
+						std::cout << term
+						          << " = "
+						          << SimpleParser::calculate(term);
+					}
+
+					std::cout << std::endl;
+				}
+			);
 		}
-		catch ( std::exception &e ) {
-			std::cerr << e.what() << std::endl;
+		catch ( std::exception &exception ) {
+			std::cerr << exception.what() << std::endl;
+
+			return false;
 		}
+
+		return true;
 	}
+}
 
-	return 0;
+int main(int argc, char** argv) {
+	if ( auto variables = input(argc, argv) ) {
+		if ( process(*variables) ) {
+			return 0;
+		} else {
+			return 1;
+		}
+	} else {
+		return 1;
+	}
 }
-- 
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