implemented interpreter; setup code dir; added code sync to Makefile

This commit is contained in:
Bob Polis 2020-09-07 11:40:58 +02:00
parent df283d562d
commit b0a3637b1d
5 changed files with 430 additions and 33 deletions

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@ -6,6 +6,7 @@ MANPAGE := $(BIN).$(MANSECTION)
SRCS := $(wildcard *.cpp)
OBJS := $(subst .cpp,.o,$(SRCS))
DEPS := $(subst .cpp,.d,$(SRCS))
CODE := $(wildcard code/*.txt)
CXX ?= g++
PKG_CONFIG ?= pkg-config
@ -29,9 +30,9 @@ endif
LDLIBS := -lm -lpthread -lcurl -lsclogging
.PHONY: all clean install
.PHONY: all sync clean install
all: $(BIN)
all: $(BIN) sync
$(BIN): $(OBJS) $(DEPS)
$(CXX) $(OBJS) $(LDFLAGS) $(LDLIBS) -o $(BIN)
@ -43,6 +44,9 @@ $(BIN): $(OBJS) $(DEPS)
%.d: ;
sync: $(CODE)
rsync -av code/ pi@www.swiftcoder.nl:/var/www/html/cpp1/
clean:
$(RM) $(OBJS) $(DEPS) $(BIN)

18
code/start.txt Normal file
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@ -0,0 +1,18 @@
\a
=result
5
=ctr
:loop
$result
dup
cat
=result
$ctr
dec
=ctr
$ctr
0
>loop
gne
$result
end

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@ -7,3 +7,369 @@
//
#include "interpreter.hpp"
#include <cctype>
#include <algorithm>
int to_int(const std::string& val) {
std::istringstream iss {val};
int result;
iss >> result;
return result;
}
void interpreter::reset() {
_prog.clear();
_stack.clear();
_labels.clear();
_vars.clear();
_calls.clear();
_pc = 0;
}
std::string interpreter::eval(std::istream& in, bool& done) {
std::string result;
reset();
done = false;
// first pass: read program & resolve labels
for (std::string line; std::getline(in, line); ++_pc) {
if (line[0] == ':') {
_labels.emplace(line.substr(1), _pc);
} else {
_prog.push_back(line);
}
}
// second pass: run program
_pc = 0;
while (_pc < _prog.size() && !done) {
// fetch next instruction
std::string code {_prog[_pc]};
// check literal int
if (std::isdigit(code[0])) {
_stack.push_back(code);
_pc++;
continue;
}
// check literal string
if (code[0] == '\\') {
_stack.push_back(code.substr(1));
_pc++;
continue;
}
// check label ref
if (code[0] == '>') {
_stack.push_back(code.substr(1));
_pc++;
continue;
}
// check var assignment
if (code[0] == '=') {
_vars[code.substr(1)] = _stack.back();
_stack.pop_back();
_pc++;
continue;
}
// check var ref
if (code[0] == '$') {
_stack.push_back(_vars[code.substr(1)]);
_pc++;
continue;
}
// exec instruction
exec_instruction(code, done);
}
if (_stack.size()) {
result = _stack.back();
}
return result;
}
void interpreter::exec_instruction(const std::string& code, bool& done) {
if (code == "end") done = true;
else if (code == "add") add();
else if (code == "sub") sub();
else if (code == "mul") mul();
else if (code == "div") div();
else if (code == "mod") mod();
else if (code == "abs") abs();
else if (code == "neg") neg();
else if (code == "dup") dup();
else if (code == "inc") inc();
else if (code == "dec") dec();
else if (code == "rev") rev();
else if (code == "slc") slc();
else if (code == "idx") idx();
else if (code == "cat") cat();
else if (code == "len") len();
else if (code == "rot") rot();
else if (code == "gto") gto();
else if (code == "geq") geq();
else if (code == "gne") gne();
else if (code == "glt") glt();
else if (code == "gle") gle();
else if (code == "ggt") ggt();
else if (code == "gge") gge();
else if (code == "fun") fun();
else if (code == "ret") ret();
else throw syntax_error {code};
}
// integer operations -----------------------------------------------------
void interpreter::add() {
int val2 {to_int(_stack.back())};
_stack.pop_back();
int val1 {to_int(_stack.back())};
_stack.pop_back();
_stack.push_back(std::to_string(val1 + val2));
_pc++;
}
void interpreter::sub() {
int val2 {to_int(_stack.back())};
_stack.pop_back();
int val1 {to_int(_stack.back())};
_stack.pop_back();
_stack.push_back(std::to_string(val1 - val2));
_pc++;
}
void interpreter::mul() {
int val2 {to_int(_stack.back())};
_stack.pop_back();
int val1 {to_int(_stack.back())};
_stack.pop_back();
_stack.push_back(std::to_string(val1 * val2));
_pc++;
}
void interpreter::div() {
int val2 {to_int(_stack.back())};
_stack.pop_back();
int val1 {to_int(_stack.back())};
_stack.pop_back();
_stack.push_back(std::to_string(val1 / val2));
_pc++;
}
void interpreter::mod() {
int val2 {to_int(_stack.back())};
_stack.pop_back();
int val1 {to_int(_stack.back())};
_stack.pop_back();
_stack.push_back(std::to_string(val1 % val2));
_pc++;
}
void interpreter::abs() {
int val {to_int(_stack.back())};
_stack.pop_back();
_stack.push_back(std::to_string(val < 0 ? -val : val));
_pc++;
}
void interpreter::neg() {
int val {to_int(_stack.back())};
_stack.pop_back();
_stack.push_back(std::to_string(-val));
_pc++;
}
void interpreter::inc() {
int val {to_int(_stack.back()) + 1};
_stack.pop_back();
_stack.push_back(std::to_string(val));
_pc++;
}
void interpreter::dec() {
int val {to_int(_stack.back()) - 1};
_stack.pop_back();
_stack.push_back(std::to_string(val));
_pc++;
}
// string operations ------------------------------------------------------
void interpreter::dup() {
_stack.push_back(_stack.back());
_pc++;
}
void interpreter::rev() {
std::string val {_stack.back()};
_stack.pop_back();
std::string result;
for (auto it = val.rbegin(); it != val.rend(); ++it) {
result += *it;
}
_stack.push_back(result);
_pc++;
}
void interpreter::slc() {
int to {to_int(_stack.back())};
_stack.pop_back();
int from {to_int(_stack.back())};
_stack.pop_back();
std::string val {_stack.back()};
_stack.pop_back();
_stack.push_back(val.substr(from, to - from));
_pc++;
}
void interpreter::idx() {
int idx {to_int(_stack.back())};
_stack.pop_back();
std::string val {_stack.back()};
_stack.pop_back();
val = val[idx];
_stack.emplace_back(val);
_pc++;
}
void interpreter::cat() {
std::string val2 {_stack.back()};
_stack.pop_back();
std::string val1 {_stack.back()};
_stack.pop_back();
_stack.emplace_back(val1 + val2);
_pc++;
}
void interpreter::len() {
std::string val {_stack.back()};
_stack.pop_back();
_stack.push_back(std::to_string(val.size()));
_pc++;
}
void interpreter::rot() {
std::string val {_stack.back()};
_stack.pop_back();
std::transform(val.begin(), val.end(), val.begin(), [](char ch) -> char {
if (ch >= 'a' && ch <= 'm') {
return ch + 13;
} else if (ch >= 'n' && ch <= 'z') {
return ch - 13;
} else if (ch >= 'A' && ch <= 'M') {
return ch + 13;
} else if (ch >= 'N' && ch <= 'Z') {
return ch - 13;
}
return ch;
});
_stack.push_back(val);
_pc++;
}
// tests & jumps ----------------------------------------------------------
void interpreter::gto() {
_pc = _labels[_stack.back()];
_stack.pop_back();
}
void interpreter::geq() {
std::string label {_stack.back()};
_stack.pop_back();
std::string val2 {_stack.back()};
_stack.pop_back();
std::string val1 {_stack.back()};
_stack.pop_back();
if (val1 == val2) {
_pc = _labels[label];
} else {
_pc++;
}
}
void interpreter::gne() {
std::string label {_stack.back()};
_stack.pop_back();
std::string val2 {_stack.back()};
_stack.pop_back();
std::string val1 {_stack.back()};
_stack.pop_back();
if (val1 != val2) {
_pc = _labels[label];
} else {
_pc++;
}
}
void interpreter::glt() {
std::string label {_stack.back()};
_stack.pop_back();
std::string val2 {_stack.back()};
_stack.pop_back();
std::string val1 {_stack.back()};
_stack.pop_back();
if (val1 < val2) {
_pc = _labels[label];
} else {
_pc++;
}
}
void interpreter::gle() {
std::string label {_stack.back()};
_stack.pop_back();
std::string val2 {_stack.back()};
_stack.pop_back();
std::string val1 {_stack.back()};
_stack.pop_back();
if (val1 <= val2) {
_pc = _labels[label];
} else {
_pc++;
}
}
void interpreter::ggt() {
std::string label {_stack.back()};
_stack.pop_back();
std::string val2 {_stack.back()};
_stack.pop_back();
std::string val1 {_stack.back()};
_stack.pop_back();
if (val1 > val2) {
_pc = _labels[label];
} else {
_pc++;
}
}
void interpreter::gge() {
std::string label {_stack.back()};
_stack.pop_back();
std::string val2 {_stack.back()};
_stack.pop_back();
std::string val1 {_stack.back()};
_stack.pop_back();
if (val1 >= val2) {
_pc = _labels[label];
} else {
_pc++;
}
}
// subroutines ------------------------------------------------------------
void interpreter::fun() {
_calls.push_back(_pc + 1); // push return address
gto();
}
void interpreter::ret() {
_pc = _calls.back();
_calls.pop_back();
}

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@ -13,16 +13,30 @@
#include <string>
#include <vector>
#include <map>
#include <stdexcept>
#include <sstream>
class syntax_error : public std::runtime_error {
public:
syntax_error(const std::string& what_arg) : std::runtime_error(what_arg) {}
};
class interpreter {
public:
interpreter() = default;
std::string eval(std::istream& in);
std::string eval(std::istream& in, bool& done);
private:
std::vector<std::string> _ops;
std::map<std::string, std::vector<std::string>> _funs;
std::vector<std::string> _prog;
std::vector<std::string> _stack;
std::map<std::string, int> _labels;
std::map<std::string, std::string> _vars;
std::vector<int> _calls;
std::vector<std::string>::size_type _pc {0};
void reset();
void exec_instruction(const std::string& code, bool& done);
// integer operations
void add();
@ -32,11 +46,11 @@ class interpreter {
void mod();
void abs();
void neg();
void dup();
void inc();
void dec();
// string operations
void dup();
void rev();
void slc();
void idx();
@ -44,30 +58,18 @@ class interpreter {
void len();
void rot();
// tests
void teq();
void tne();
void tlt();
void tle();
void tgt();
void tge();
// tests & jumps
void gto();
void geq();
void gne();
void glt();
void gle();
void ggt();
void gge();
// blocks
void end();
// conditionals
void ift();
void els();
// loops
void whl();
// functions
// subroutines
void fun();
void run();
// solution
void sol();
void ret();
};
#endif // _interpreter_H_

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@ -66,13 +66,20 @@ int main(int argc, const char * argv[]) {
}
}
bool done {false};
std::string base_url {"https://www.swiftcoder.nl/cpp1/"};
std::string next_url {"start.txt"};
std::string code;
requester req;
std::string code {req.get("https://www.swiftcoder.nl/cpp1/start.txt")};
interpreter proc;
while (!done) {
code = req.get(base_url + next_url);
std::cerr << code << '\n';
std::istringstream in {code};
interpreter proc;
std::string result {proc.eval(in)};
std::cerr << result << '\n';
next_url = proc.eval(in, done);
std::cerr << next_url << '\n';
}
std::cout << next_url << '\n';
} catch (const std::exception& ex) {
std::cerr << "curly: " << ex.what() << '\n';