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AssemblyLanguageParser.cpp
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AssemblyLanguageParser.cpp
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#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/fusion/include/adapt_struct.hpp>
#include <boost/phoenix/bind/bind_member_function.hpp>
#include <string>
#include <vector>
#include <functional>
#include <map>
/**
Parser and executer of my primitive (not Turing complete) assembly-like language
Example:
create function_name(param1, param2,...) {
create x,
create y,
setval x 5,
setval y 10,
add y y,
mul x y,
sub y x,
div x y,
setvar param1 x,
setvar param2 y,
print x
}
*/
#define BIND_VALUE(member_method, bind_point) phoenix::bind(&member_method, &bind_point, qi::_1)
namespace qi = boost::spirit::qi;
namespace ascii = boost::spirit::ascii;
namespace phoenix = boost::phoenix;
namespace L
{
class Function {
private:
struct Command {
std::string commandName;
std::string param1;
std::string param2;
Command(const std::string& cmdName)
: commandName(cmdName) {}
};
bool isValid = true;
std::string name;
std::vector<std::string> params;
std::vector<Command> commands;
public:
Function() = default;
void SetName(const std::string& n) {
//std::cout << "setting name " << n << std::endl;
name = n;
}
void AddFunctionParameter(const std::string& p) {
//std::cout << "adding function parameter " << p << std::endl;
params.push_back(p);
}
void AddCommand(const std::string& c) {
//std::cout << "adding command " << c << std::endl;
commands.emplace_back(c);
}
void AddCommandParameter(const std::string& p) {
//std::cout << "adding command parameter " << p << std::endl;
if (!commands.empty()) {
auto& b = commands.back();
if (b.param1.empty()) {
b.param1 = p;
}
else if (b.param2.empty()) {
b.param2 = p;
}
else {
isValid = false;
}
}
}
bool CheckValidity() {
if (name.empty()) {
isValid = false;
}
return isValid;
}
void Execute() const {
if (!isValid) {
return;
}
std::cout << "Executing:" << std::endl;
std::map<std::string, int> variables;
bool shouldQuit = false;
auto checkVariable = [&](const std::string& s) -> bool {
if (variables.find(s) == variables.end()) {
std::cerr << "Error: Variable " << s << " does not exist" << std::endl;
shouldQuit = true;
return false;
}
return true;
};
// Initialize parameters as variables
for (const auto& p : params) {
variables[p] = 0;
}
for (const auto& c : commands) {
if (shouldQuit) {
return;
}
if (c.commandName == "create") {
variables[c.param1] = 0;
}
else if (c.commandName == "setval") {
if (checkVariable(c.param1)) {
variables[c.param1] = std::atoi(c.param2.c_str());
}
}
else if (c.commandName == "setvar") {
if (checkVariable(c.param1) && checkVariable(c.param2)) {
variables[c.param1] = variables[c.param2];
}
}
else if (c.commandName == "print") {
if (checkVariable(c.param1)) {
std::cout << c.param1 << " = " << variables[c.param1] << std::endl;
}
}
else if (c.commandName == "add") {
if (checkVariable(c.param1) && checkVariable(c.param2)) {
variables[c.param1] += variables[c.param2];
}
}
else if (c.commandName == "sub") {
if (checkVariable(c.param1) && checkVariable(c.param2)) {
variables[c.param1] -= variables[c.param2];
}
}
else if (c.commandName == "mul") {
if (checkVariable(c.param1) && checkVariable(c.param2)) {
variables[c.param1] *= variables[c.param2];
}
}
else if (c.commandName == "div") {
if (checkVariable(c.param1) && checkVariable(c.param2)) {
if (variables[c.param2] != 0) {
variables[c.param1] /= variables[c.param2];
}
else {
std::cerr << "Division by zero" << std::endl;
return;
}
}
}
}
std::cout << "Variables stats:" << std::endl;
for (const auto& p : variables) {
std::cout << p.first << " = " << p.second << std::endl;
}
}
};
template<typename It>
class FunctionParser : public qi::grammar<It, std::string(), ascii::space_type>
{
private:
qi::rule<It, std::string(), ascii::space_type> startRule;
qi::rule<It, std::string(), ascii::space_type> paramRule;
qi::rule<It, std::string(), ascii::space_type> bodyRule;
Function func;
public:
FunctionParser() : FunctionParser::base_type(startRule)
{
startRule =
qi::lit("create")
>> qi::as_string[+(qi::alnum - qi::char_('('))][BIND_VALUE(Function::SetName, func)]
>> qi::char_('(')
>> *paramRule
>> qi::char_(')')
>> qi::char_('{')
>> -bodyRule
>> qi::char_('}');
paramRule =
qi::as_string[+(qi::alnum)][BIND_VALUE(Function::AddFunctionParameter, func)]
>> -qi::char_(',');
bodyRule =
qi::as_string[qi::lexeme[+qi::alnum - qi::char_('}')]][BIND_VALUE(Function::AddCommand, func)]
>> -qi::as_string[qi::lexeme[+qi::alnum - qi::char_('}')]][BIND_VALUE(Function::AddCommandParameter, func)]
>> -qi::as_string[qi::lexeme[+qi::alnum - qi::char_('}')]][BIND_VALUE(Function::AddCommandParameter, func)]
>> -(qi::char_(',') >> bodyRule);
}
Function& GetParsedFunction() {
return func;
}
};
}
template<typename It>
void ParseAndExecute(It first, It end)
{
L::FunctionParser<It> parser;
std::string s;
bool succ = qi::phrase_parse(first, end, parser, ascii::space, s);
auto& func = parser.GetParsedFunction();
if (succ && func.CheckValidity()) {
std::cout << "Parsing successful" << std::endl;
func.Execute();
}
else {
std::cout << "Parsing failed" << std::endl;
}
}
int main() {
std::string line;
std::stringstream ss;
do {
std::getline(std::cin, line);
ss << line;
} while (!line.empty());
auto str = ss.str();
ParseAndExecute(str.cbegin(), str.cend());
return 0;
}