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parser.cpp
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parser.cpp
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#include "ptable_reader.h"
#include "token.h"
#include "parser.h"
#include "semantic_object.h"
#include <iostream>
#include <string>
#include <stack>
#include <vector>
#include <set>
std::string Parser::generateTemporaryToken() {
return "t" + std::to_string(temporaryTokenIndex++);
}
std::string Parser::generateLabelToken() {
return "l" + std::to_string(labelTokenIndex++);
}
std::string mergeLines(std::string a, std::string b){
if(a.length()>0&&b.length()>0){
return a+"\n"+b;
}
else if(a.length()>0)
return a;
return b;
}
void Parser::modifyStack(std::vector<SemanticObject> &stack, int ruleNumber) {
SemanticObject so;
bool toPush = true;
switch (ruleNumber) {
case 0:
toPush = false;
break;
case 1: {
SemanticObject stmts = stack.back();
stack.pop_back();
SemanticObject stmt = stack.back();
stack.pop_back();
// so.code = stmt.code + "\n" + stmts.code;
so.code = mergeLines(stmt.code, stmts.code);
break;
}
case 2: {
so.code = "";
so.temp = "";
break;
}
case 4:
toPush = false;
break;
case 6:
toPush = false;
break;
case 8: {
stack.pop_back();
SemanticObject ass = stack.back();
stack.pop_back();
so.code = ass.code;
so.temp = ass.temp;
break;
}
case 9:
{
stack.pop_back();
SemanticObject defn = stack.back();
stack.pop_back();
so.code = defn.code;
so.temp = defn.temp;
break;
}
case 10:
{
stack.pop_back();
SemanticObject fcall = stack.back();
stack.pop_back();
so.code = fcall.code;
so.temp = fcall.temp;
break;
}
case 11: {
SemanticObject defnList = stack.back();
stack.pop_back(); stack.pop_back();
so.temp = "";
so.code = defnList.code;
break;
}
case 12: {
SemanticObject defnList = stack.back();
stack.pop_back(); stack.pop_back();
SemanticObject imi = stack.back();
stack.pop_back();
so.temp = "";
// so.code = imi.code + "\n" + defnList.code;
so.code = mergeLines(imi.code, defnList.code);
break;
}
case 13: {
SemanticObject imi = stack.back();
stack.pop_back();
so.code = imi.code;
so.temp = imi.temp;
break;
}
case 14: {
SemanticObject id = stack.back();
stack.pop_back();
so.code = id.code;
so.temp = id.temp;
break;
}
case 15: {
SemanticObject expr = stack.back();
stack.pop_back(); stack.pop_back();
SemanticObject id = stack.back();
stack.pop_back();
// so.code = expr.code + "\n" + id.temp + " := " + expr.temp;
so.code = mergeLines(expr.code,id.temp + " := " + expr.temp);
break;
}
case 16: {
stack.pop_back();
so.code = stack.back().code;
stack.pop_back(); stack.pop_back(); stack.pop_back(); stack.pop_back(); stack.pop_back(); stack.pop_back(); stack.pop_back();
break;
}
case 21: {
stack.pop_back();
SemanticObject stmt2 = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back(); stack.pop_back();
SemanticObject stmt1 = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
SemanticObject expr = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
so.temp = "";
std::string ifL = generateLabelToken();
std::string elseL = generateLabelToken();
std::string skipL = generateLabelToken();
// so.code = expr.code + "\nif(" + expr.temp + ") goto " + ifL + "\ngoto " + elseL + "\n" + ifL + ":\n" + stmt1.code + "\ngoto " + skipL + "\n" + elseL + ":\n" + stmt2.code + "\n" + skipL + ":\n";
so.code = mergeLines(expr.code, "\nif(" + expr.temp + ") goto " + ifL + "\ngoto " + elseL + "\n" + ifL + ":\n" + stmt1.code + "\ngoto " + skipL + "\n" + elseL + ":\n" + stmt2.code + "\n" + skipL + ":\n");
break;
}
case 22: {
SemanticObject innerIf = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
SemanticObject stmts = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
SemanticObject expr = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
std::string ifL = generateLabelToken();
std::string elseL = generateLabelToken();
std::string skipL = generateLabelToken();
so.temp = "";
// so.code = expr.code + "\nif (" + expr.temp + ") goto " + ifL + "\ngoto " + elseL \
// + "\n" + ifL + ":\n" + stmts.code + "\ngoto " + skipL + "\n" + \
// elseL + ":\n" + innerIf.code + "\n" + skipL + ":\n";
so.code =mergeLines(expr.code, "\nif (" + expr.temp + ") goto " + ifL + "\ngoto " + elseL \
+ "\n" + ifL + ":\n" + stmts.code + "\ngoto " + skipL + "\n" + \
elseL + ":\n" + innerIf.code + "\n" + skipL + ":\n");
break;
}
case 23: {
stack.pop_back();
SemanticObject stmts = stack.back();
stack.pop_back();
stack.pop_back();
stack.pop_back();
SemanticObject expr = stack.back();
stack.pop_back();
stack.pop_back();
stack.pop_back();
so.temp = "";
std::string ifL = generateLabelToken();
std::string skipL = generateLabelToken();
// so.code = expr.code + "\nif (" + expr.temp + ") goto " + ifL + "\ngoto " + skipL + "\n" + ifL + ":\n" + stmts.code + "\n" + skipL + ":\n";
so.code = mergeLines(expr.code, "\nif (" + expr.temp + ") goto " + ifL + "\ngoto " + skipL + "\n" + ifL + ":\n" + stmts.code + "\n" + skipL + ":\n");
break;
}
case 25: {
stack.pop_back();
SemanticObject stmts = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
SemanticObject expr = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
std::string whileL = generateLabelToken();
std::string ifL = generateLabelToken();
std::string skipL = generateLabelToken();
so.temp = "";
so.code = whileL + ":\n" + expr.code + "\nif (" + expr.temp + ") goto " + ifL + "\ngoto " + skipL + "\n" + ifL + ":\n" + stmts.code + "\ngoto " + whileL + "\n" + skipL + ":\n";
break;
}
case 27: {
SemanticObject expr = stack.back();
stack.pop_back();
SemanticObject _ = stack.back();
stack.pop_back();
SemanticObject id = stack.back();
stack.pop_back();
so.temp = "";
// so.code = expr.code + "\n" + id.temp + " := " + expr.temp;
so.code = mergeLines(expr.code, id.temp + " := " + expr.temp);
break;
}
case 28: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 29: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 30: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 31: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 32: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 33: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 34:
toPush = false;
break;
case 35: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 36: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 37:
toPush = false;
break;
case 38: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 39: {
so.temp = generateTemporaryToken();
SemanticObject op2 = stack.back();
stack.pop_back();
SemanticObject op = stack.back();
stack.pop_back();
SemanticObject op1 = stack.back();
stack.pop_back();
// so.code = op1.code + "\n" + op2.code + "\n";
so.code = mergeLines(op1.code, op2.code) + "\n";
so.code += so.temp + " := " + op1.temp + " " + op.temp + " " + op2.temp;
break;
}
case 40:
toPush = false;
break;
case 41: {
SemanticObject _ = stack.back();
stack.pop_back();
SemanticObject expr = stack.back();
stack.pop_back();
SemanticObject __ = stack.back();
stack.pop_back();
so.code = expr.code;
so.temp = expr.temp;
break;
}
case 42:
toPush = false;
break;
case 43:
toPush = false;
break;
case 44:
toPush = false;
break;
case 45:
toPush = false;
break;
case 46:
toPush = false;
break;
case 47: {
stack.pop_back();
SemanticObject arg = stack.back();
stack.pop_back(); stack.pop_back(); stack.pop_back();
so.code = arg.code;
break;
}
case 48: {
SemanticObject args = stack.back();
stack.pop_back(); stack.pop_back();
SemanticObject arg = stack.back();
stack.pop_back();
// so.code = arg.code + "\n" + args.code;
so.code = mergeLines(arg.code, args.code);
break;
}
case 49: {
SemanticObject arg = stack.back();
stack.pop_back();
so.code = arg.code;
break;
}
case 50: {
SemanticObject expr = stack.back();
stack.pop_back();
so.code = expr.code;
break;
}
case 58: {
so.temp = stack.back().temp;
so.code = "";
stack.pop_back();
break;
}
case 59: {
so.temp = generateTemporaryToken();
so.code = so.temp + " := " + stack.back().temp;
stack.pop_back();
break;
}
case 60: {
so.temp = generateTemporaryToken();
so.code = so.temp + " := " + stack.back().temp;
stack.pop_back();
break;
}
case 61: {
so.temp = generateTemporaryToken();
so.code = so.temp + " := -" + stack.back().temp;
stack.pop_back();
break;
}
case 62: {
so.temp = generateTemporaryToken();
so.code = so.temp + " := " + stack.back().temp;
stack.pop_back();
break;
}
case 63: {
so.temp = generateTemporaryToken();
so.code = so.temp + " := " + stack.back().temp;
stack.pop_back();
break;
}
case 64: {
so.temp = generateTemporaryToken();
so.code = so.temp + " := " + stack.back().temp;
stack.pop_back();
break;
}
case 65: {
so.temp = generateTemporaryToken();
so.code = so.temp + " := -" + stack.back().temp;
stack.pop_back();
break;
}
default: {
so.temp = "";
so.code = "";
int toRemove = stoi(preader->ruleConstants[ruleNumber][1]);
for (int i = stack.size() - toRemove; i < stack.size(); i++) {
if (stack[i].code != "") {
so.code += stack[i].code + "\n";
}
}
for (int i = 0; i < toRemove; i++) {
stack.pop_back();
}
}
}
if (toPush) {
stack.push_back(so);
}
}
void printStack(std::vector<std::string> &s, std::string move){
std::cout<<"Stack: ";
for(int i = 0; i < s.size(); i++){
std::cout<<s[i]<<" ";
}
std::cout<<std::endl<<move<<std::endl;
}
std::string resolveTokenValue(Token t){
if (t.type == "identifier") {
return "<id>";
} else if (t.type == "int") {
return "<num>";
} else if (t.type == "float") {
return "<flt>";
} else if (t.type == "string") {
return "<str>";
}
return t.tokenString;
}
void printErrors(std::vector<std::vector<std::string> > &errorList){
for(int i=0;i<errorList.size();i++){
std::cout << "Error at line " << errorList[i][1] << ", token: " << errorList[i][2] << " of type: " << errorList[i][3] << " resolved to token: " << errorList[i][4] << std::endl;
}
}
Parser::Parser(std::vector<Token> tokens, ParsingTableReader *ptable) {
preader = ptable;
tokens.push_back(Token("$", -1, "EOF", -1));
int tokenPointer = 0;
std::vector<std::string> stack;
std::vector<SemanticObject> semanticStack;
std::vector<std::vector<std::string> > errorList;
stack.push_back("0");
while (tokenPointer < tokens.size()) {
Token token = tokens[tokenPointer];
std::string tokVal = resolveTokenValue(token);
auto temp = ptable->actionTable.find(make_pair(stack.back(), tokVal));
if (temp != ptable->actionTable.end()) {
std::string action = temp->second;
if (action == "acc") {
std::cout << "Parsing Successful with ";
errorList.size() == 0 ? std::cout<<"no" : std::cout<<"some";
std::cout<<" errors."<<std::endl;
printErrors(errorList);
std::cout << "\n\nThe intermediate three address code generated is:" << std::endl;
std::cout << semanticStack.back().code << std::endl;
return;
}
if (action[0] == 's') {
printStack(stack, action);
stack.push_back(tokVal);
stack.push_back(action.substr(1));
// push into semantic stack
SemanticObject sobj = SemanticObject();
sobj.code = "";
sobj.temp = token.tokenString;
semanticStack.push_back(sobj);
tokenPointer++;
} else if (action[0] == 'r') {
int ruleNum = stoi(action.substr(1));
printStack(stack, action);
std::string nonTerminal = ptable->ruleConstants[ruleNum][0];
int ruleLength = stoi(ptable->ruleConstants[ruleNum][1]);
for (int i = 0; i < 2 * ruleLength; i++) {
stack.pop_back();
}
modifyStack(semanticStack, ruleNum);
// semantic conditions
std::string lastState = stack.back();
// std::cout << "Last state: " << lastState << std::endl;
stack.push_back(nonTerminal);
std::string toPush = ptable->gotoTable[make_pair(lastState, nonTerminal)];
printStack(stack, "goto " + toPush);
stack.push_back(toPush);
}
} else {
// handle error
// std::cout << "Error." << std::endl;
// std::cout << "Token: " << token.tokenString << std::endl;
// std::cout << "Line: " << token.lineNumber << std::endl;
// std::cout << "Token Type: " << token.type << " " << tokVal << std::endl;
// std::cout << "State: " << stack.back() << std::endl;
std::vector<std::string> errorListItem{ stack.back(), std::to_string(token.lineNumber), token.tokenString, token.type, tokVal };
errorList.push_back(errorListItem);
std::vector<std::string> safeSymbols {";", "}", "$"};
int safeSymbolFound = 0;
std::cout<<"PANIC MODE!\n";
for(int i = 0; i < safeSymbols.size(); i++) {
if(tokVal == safeSymbols[i]){
tokenPointer++;
break;
}
}
while(tokenPointer < tokens.size()) {
Token tempToken = tokens[tokenPointer];
std::string tempTokVal = resolveTokenValue(tempToken);
for(int i = 0; i < safeSymbols.size(); i++){
if(tempTokVal == safeSymbols[i]){
tokenPointer++;
safeSymbolFound = 1;
break;
}
}
if(safeSymbolFound == 1)
break;
tokenPointer++;
}
}
}
}