From c2fd11ff111158059682f38422ca1cbcd46d165d Mon Sep 17 00:00:00 2001
From: avinal <185067@nith.ac.in>
Date: Mon, 10 Aug 2020 12:21:58 +0530
Subject: [PATCH] working without symbols

---
 include/parser.hpp |  34 ++++-----
 src/parser.cpp     | 185 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 201 insertions(+), 18 deletions(-)

diff --git a/include/parser.hpp b/include/parser.hpp
index e593cc1..06a5f16 100644
--- a/include/parser.hpp
+++ b/include/parser.hpp
@@ -1,26 +1,26 @@
-#pragma once
-#ifdef PARSER_HPP
-#define PARSER_HPP
-
-#include "code.hpp"
 #include <fstream>
+#include <vector>
+#include <unordered_map>
+#include <functional>
+#include <algorithm>
+#include <bitset>
 
-class parser : public code
+class parser
 {
 private:
-    std::ifstream asmfile;
+    std::string filename;
+    int count_ins = 0;
 
 public:
-    parser(std::string input_file);
-    ~parser();
+    parser() {}
+    parser(std::string input_file) : filename(input_file) {}
 
-    bool has_more_commands();
-    void advance();
-    char command_type();
+    void assemble();
+    std::vector<std::array<char, 16>> get_machine_code;
+    char command_type(std::string mnemonic);
     std::string symbol();
-    std::array<char, 3> dest();
-    std::array<char, 7> comp();
-    std::array<char, 3> jump();
+    std::string dest(std::string des);
+    std::string comp(std::string com);
+    std::string jump(std::string jum);
+    std::array<std::string, 3> split(std::string mnemonic);
 };
-
-#endif
diff --git a/src/parser.cpp b/src/parser.cpp
index fa7397a..efdfa3c 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -1 +1,184 @@
-#include "../include/parser.hpp"
\ No newline at end of file
+#include "../include/parser.hpp"
+
+void parser::assemble()
+{
+    std::ifstream asmfile(filename);
+    int pos = filename.find(".");
+    filename.erase(pos);
+    std::string outfile = filename + ".hack";
+
+    std::ofstream genfile(outfile);
+
+    std::string instruction;
+    if (asmfile.is_open())
+    {
+        while (std::getline(asmfile, instruction))
+        {
+            std::string converted = "";
+            std::string binary;
+            instruction.erase(instruction.size() - 1);
+            if (instruction.empty() ||
+                instruction.substr(0, 2) == "//")
+            {
+                continue;
+            }
+            else
+            {
+                switch (command_type(instruction))
+                {
+                case 'A':
+                {
+                    count_ins++;
+                    converted += "0";
+                    int address;
+                    instruction = instruction.substr(1);
+                    if (std::all_of(instruction.begin(),instruction.end(),::isdigit)){
+                        address = std::stoi(instruction);
+                    }else
+                    {
+                        
+                    }
+                    
+                        binary = std::bitset<15>(std::stoi(instruction.substr(1))).to_string();
+                    converted += binary;
+                }
+                break;
+                case 'C':
+                {
+                    count_ins++;
+                    auto token = split(instruction);
+                    binary = comp(token[1]) + dest(token[0]) + jump(token[2]);
+                    converted += "111" + binary;
+                }
+                break;
+                case 'L':
+                    break;
+                default:
+                    break;
+                }
+                if (genfile.is_open())
+                {
+                    genfile << converted << std::endl;
+                }
+            }
+        }
+        genfile.close();
+        asmfile.close();
+    }
+}
+
+std::array<std::string, 3> parser::split(std::string mnemonic)
+{
+    std::array<std::string, 3> token;
+    int pos;
+    if ((pos = mnemonic.find(';')) != std::string::npos)
+    {
+        token.at(2) = mnemonic.substr(pos + 1);
+        mnemonic.erase(pos);
+    }
+    else
+    {
+        token.at(2) = "null";
+    }
+
+    if ((pos = mnemonic.find("=")) != std::string::npos)
+    {
+        token.at(1) = mnemonic.substr(pos + 1);
+        mnemonic.erase(pos);
+        token.at(0) = mnemonic;
+    }
+    else
+    {
+        token.at(1) = mnemonic;
+        token.at(0) = "null";
+    }
+    return token;
+}
+
+std::string parser::comp(std::string com)
+{
+    const std::unordered_map<std::string, std::string> compare({{"0", "101010"},
+                                                                {"1", "111111"},
+                                                                {"-1", "111010"},
+                                                                {"D", "001100"},
+                                                                {"C", "110000"},
+                                                                {"!D", "001101"},
+                                                                {"!C", "110001"},
+                                                                {"-D", "001111"},
+                                                                {"-C", "110011"},
+                                                                {"D+1", "011111"},
+                                                                {"C+1", "110111"},
+                                                                {"D-1", "001110"},
+                                                                {"C-1", "110010"},
+                                                                {"D+C", "000010"},
+                                                                {"D-C", "010011"},
+                                                                {"C-D", "000111"},
+                                                                {"D&C", "000000"},
+                                                                {"D|C", "010101"}});
+
+    std::string recomp = "";
+    int pos;
+    char am;
+    if ((pos = com.find("M")) != std::string::npos)
+    {
+        com.replace(pos, 1, "C");
+        recomp += "1";
+    }
+    else if ((pos = com.find("A")) != std::string::npos)
+    {
+        com.replace(pos, 1, "C");
+        recomp += "0";
+    }
+    else
+    {
+        recomp += "0";
+    }
+
+    if (compare.find(com) != compare.end())
+    {
+        recomp += compare.at(com);
+    }
+    return recomp;
+}
+
+std::string parser::dest(std::string des)
+{
+    const std::unordered_map<std::string, std::string> destination({{"null", "000"},
+                                                                    {"M", "001"},
+                                                                    {"D", "010"},
+                                                                    {"MD", "011"},
+                                                                    {"A", "100"},
+                                                                    {"AM", "101"},
+                                                                    {"AD", "110"},
+                                                                    {"AMD", "111"}});
+    return destination.at(des);
+}
+
+std::string parser::jump(std::string jum)
+{
+    const std::unordered_map<std::string, std::string> jumpto({{"null", "000"},
+                                                               {"JGT", "001"},
+                                                               {"JEQ", "010"},
+                                                               {"JGE", "011"},
+                                                               {"JLT", "100"},
+                                                               {"JNE", "101"},
+                                                               {"JLE", "110"},
+                                                               {"JMP", "111"}});
+    return jumpto.at(jum);
+}
+
+char parser::command_type(std::string mnemonic)
+{
+    if (mnemonic.front() == '@')
+    {
+        return 'A';
+    }
+    else if (mnemonic.front() == '(' && mnemonic.back() == ')')
+    {
+        return 'L';
+    }
+    else
+    {
+        return 'C';
+    }
+}
\ No newline at end of file