1 files changed, 184 insertions, 0 deletions
diff --git a/commands.cpp b/commands.cpp
new file mode 100644
index 0000000..3e78463
--- /dev/null
+++ b/commands.cpp
@@ -0,0 +1,184 @@
+#include "commands.h"
+#include "error.h"
+
+#include <cctype>
+#include <iostream>
+#include <algorithm>
+#include <string>
+#include <utility>
+#include <vector>
+#include <regex>
+#include <cstring>
+
+using std::cout, std::endl, std::string, std::vector, std::tolower;
+
+const void CommandsModule::printHello(const CommandArg* argv)
+{
+	cout << "Hello" << endl;
+}
+
+const void CommandsModule::echo(const CommandArg* argv)
+{
+	cout << "Echo: '" << argv[0].str << '\'' << endl;
+}
+
+CommandsModule::CommandsModule()
+{
+	addCommand("printHello", &CommandsModule::printHello, 0, {}, this);
+	CommandArgType* args0 = new CommandArgType[1];
+	args0[0] = STR_REST;
+	addCommand("echo", &CommandsModule::echo, 1, args0, this);
+}
+CommandsModule::~CommandsModule()
+{
+	for(Command c : commandList)
+	{
+		// This is probably needed but its not working
+		//if(c.argc > 0)
+			//delete[] c.argTypes;
+	}
+}
+
+void CommandsModule::addCommand(Command c)
+{
+	if(lookupCommand(c.name) != nullptr)
+	{
+		cout << "Duplicate command: " << c.name << endl;
+	}
+	commandList.push_back(c);
+}
+
+struct NameMatches
+{
+	NameMatches(string s): s_{s} {}
+	bool operator()(Command c) { return (c.name == s_); }
+	string s_;        
+};
+
+Command* CommandsModule::lookupCommand(string name)
+{
+	auto elem = std::find_if(commandList.begin(), commandList.end(), NameMatches(name));
+	if (elem != commandList.end())
+	{
+		int i = elem - commandList.begin();
+		return &(commandList[i]);
+	}
+	else
+	{
+		return nullptr;
+	}
+}
+
+vector<string> CommandsModule::splitCommand(string command)
+{
+	vector<string> v;
+	string regexString = "((?:\"[^\"\n]+\")|(?:'[^'\n]+')|(?:[^ \n]+))+";
+	std::regex regex(regexString, std::regex_constants::_S_icase);
+	auto begin = std::sregex_iterator(command.begin(), command.end(), regex);
+	auto end = std::sregex_iterator();
+	for (std::sregex_iterator i = begin; i != end; i++)
+	{
+		std::smatch match = *i;
+		std::string str = match.str();
+		if(str[0] == '\'' || str[0] == '"')
+			str = str.substr(1, str.size() - 2);
+		v.push_back(str);
+	}
+	return v;
+}
+
+template <typename T>
+std::basic_string<T> lowercase(const std::basic_string<T>& s)
+{
+    std::basic_string<T> s2 = s;
+    std::transform(s2.begin(), s2.end(), s2.begin(), [](unsigned char c){ return std::tolower(c); });
+    return s2;
+}
+
+CommandArg* CommandsModule::getCommandArgs(vector<string>& split, const CommandArgType* argTypes, const int argc)
+{
+	CommandArg* args = new CommandArg[argc];
+	for(int i = 1; i < argc + 1; i++)
+	{
+		switch(argTypes[i-1])
+		{
+			case STR: args[i-1].str = (char*)split[i].c_str(); break;
+			case NUM: args[i-1].num = std::stoi(split[i]); break;
+			case DIR: args[i-1].dir = LEFT; break;
+			case STR_REST:
+			{
+				string rest = "";
+				for(int j = i; j < split.size(); j++)
+				{
+					rest += split[j];
+					if(j != split.size() - 1)
+						rest += " ";
+				}
+				args[i-1].str = new char[rest.size()];
+				strcpy(args[i-1].str, rest.c_str());
+				return args;
+			}
+			case NUM_ARR_REST:
+			{
+				int* rest = new int[split.size() - i];
+				for(int j = 0; j < split.size() - i; j++)
+				{
+					rest[j] = std::stoi(split[j + i]);
+				}
+				args[i-1].numArr = {rest, (int) split.size() - i};
+				return args;
+			}
+			default: cout << "UH OH SOMETHING IS VERY WRONG" << endl;
+		}
+	}
+	return args;
+}
+
+void CommandsModule::runCommand(string command)
+{
+	vector<string> split = splitCommand(command);
+	Command* cmd = lookupCommand(split[0]);
+	if(cmd == nullptr)
+		throw Err(CMD_ERR_NOT_FOUND, split[0] + " is not a valid command name");
+	if(cmd->argc > split.size() - 1)
+		throw Err(CMD_ERR_WRONG_ARGS, command + " is the wrong args");
+	CommandArg* args = getCommandArgs(split, cmd->argTypes, cmd->argc);
+	try
+	{
+		cmd->func(*cmd->module, args);
+	}
+	catch (Err e)
+	{
+		for(int i = 0; i < cmd->argc; i++)
+		{
+			if(cmd->argTypes[i] == STR_REST)
+				delete[] args[i].str;
+		}
+		delete[] args;
+		throw e;
+	}
+	for(int i = 0; i < cmd->argc; i++)
+	{
+		if(cmd->argTypes[i] == STR_REST)
+			delete[] args[i].str;
+	}
+	delete[] args;
+}
+
+Err CommandsModule::checkCommand(string command)
+{
+	vector<string> split = splitCommand(command);
+	Command* cmd = lookupCommand(split[0]);
+	if(cmd == nullptr)
+		return Err(CMD_ERR_NOT_FOUND, split[0] + " is not a valid command name");
+	if(cmd->argc > split.size())
+		return Err(CMD_ERR_WRONG_ARGS, command + " is the wrong args");
+	CommandArg* args = getCommandArgs(split, cmd->argTypes, cmd->argc);
+	for(int i = 0; i < cmd->argc; i++)
+	{
+		if(cmd->argTypes[i] == STR_REST || cmd->argTypes[i] == NUM_ARR_REST)
+			delete[] args[i].str;
+	}
+	delete[] args;
+	return Err(NOERR, "");
+}