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Parser.cpp
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236 lines (223 loc) · 7.71 KB
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#include <vector>
#include "Parser.h"
#include "BlockManager.h"
#include "Exceptions.h"
using namespace std;
Block* Parser::recursiveBlockParse(vector<Token>::const_iterator& itr) {
if (itr->tag == Token::LP) {
safe_next(itr);
if (itr->tag == Token::BLOCK) {
safe_next(itr);
vector<Statement*> temp;
temp.push_back(recursiveStatementParse(itr));
Block* block = new Block(temp);
safe_next(itr);
while (itr->tag != Token::RP) {
block->add_statements(recursiveStatementParse(itr));
safe_next(itr);
}
return block_m.makeBlock(*block);
}
else {
--itr;
vector<Statement*> temp;
temp.push_back(recursiveStatementParse(itr));
Block* block = new Block(temp);
return block_m.makeBlock(*block);
}
}
else {
throw ParseError("Unrecognized operator BLOCK");
}
}
Statement* Parser::recursiveStatementParse(vector<Token>::const_iterator& itr) {
if (itr->tag == Token::LP) {
safe_next(itr);
if (itr->tag == Token::INPUT) { //input
safe_next(itr);
if (itr->tag == Token::VARIABILE) {
stringstream temp{};
temp << itr->word;
string var;
temp >> var;
Variable* variable = new Variable(var, 0);
safe_next(itr);
if (itr->tag == Token::RP) {
return statement_m.makeInputStmt(variable);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else {
throw ParseError("Unxepected token");
}
}
else if (itr->tag == Token::PRINT) {
safe_next(itr);
NumExpr* num_expr = recursiveNumExprParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return statement_m.makePrintStmt(num_expr);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else if (itr->tag == Token::SET) {
safe_next(itr);
if (itr->tag == Token::VARIABILE) {
stringstream temp{};
temp << itr->word;
string var;
temp >> var;
Variable* variable = new Variable(var, 0);
safe_next(itr);
NumExpr* num_expr = recursiveNumExprParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return statement_m.makeSetStmt(variable, num_expr);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else {
throw ParseError("Unxepcted Token");
}
}
else if (itr->tag == Token::WHILE) {
safe_next(itr);
BoolExpr* first = recursiveBoolExprParse(itr);
safe_next(itr);
Block* second = recursiveBlockParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return statement_m.makeWhileStmt(first, second);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else if (itr->tag == Token::IF) {
safe_next(itr);
BoolExpr* first = recursiveBoolExprParse(itr);
safe_next(itr);
Block* second = recursiveBlockParse(itr);
safe_next(itr);
Block* third = recursiveBlockParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return statement_m.makeIfStmt(first, second, third);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else {
throw ParseError("Unexpected token");
}
}
else {
throw ParseError("Unexpected token");
}
}
NumExpr* Parser::recursiveNumExprParse(vector<Token>::const_iterator& itr) {
if (itr->tag == Token::LP) {
safe_next(itr);
if (itr->tag >= 17 && itr->tag <= 20) {
string temp = itr->word;
safe_next(itr);
NumExpr* first = recursiveNumExprParse(itr);
safe_next(itr);
NumExpr* second = recursiveNumExprParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return numexpr_m.makeOperator(Operator::stringToOpCode_Operator(temp), first, second);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else {
throw ParseError("Unexpected token");
}
}
else if (itr->tag == Token::NUMERO) {
stringstream temp{};
temp << itr->word;
int64_t value;
temp >> value;
NumExpr* number = numexpr_m.makeNumber(value);
return number;
}
else if (itr->tag == Token::VARIABILE) {
std::stringstream temp{};
temp << itr->word;
string var;
temp >> var;
return numexpr_m.makeVariable(var, 0);
}
else {
throw ParseError("Unexpected token");
return nullptr;
}
}
BoolExpr* Parser::recursiveBoolExprParse(vector<Token>::const_iterator& itr) {
if (itr->tag == Token::LP) {
safe_next(itr);
if (itr->tag == Token::LT || itr->tag == Token::GT || itr->tag == Token::EQ) { //lt, gt, eq
string temp = itr->word;
safe_next(itr);
NumExpr* first = recursiveNumExprParse(itr);
safe_next(itr);
NumExpr* second = recursiveNumExprParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return boolexpr_m.makeRelOp(RelOp::stringToOpCode_Operator(temp), first, second);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else if (itr->tag == 12 || itr->tag == 13) { //and, or
string temp = itr->word;
safe_next(itr);
BoolExpr* first = recursiveBoolExprParse(itr);
safe_next(itr);
BoolExpr* second = recursiveBoolExprParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return boolexpr_m.makeBoolOp(BoolOp::stringToOpCode_Operator(temp), first, second);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else if (itr->tag == 14) { //not
string temp = itr->word;
safe_next(itr);
BoolExpr* first = recursiveBoolExprParse(itr);
safe_next(itr);
if (itr->tag == Token::RP) {
return boolexpr_m.makeBoolOp(BoolOp::stringToOpCode_Operator(temp), first, nullptr);
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else if (itr->tag == 15 || itr->tag == 16) { //true, false
string temp = itr->word;
safe_next(itr);
if (itr->tag == Token::RP) {
return boolexpr_m.makeBoolConst(BoolConst::stringToOpCode_Operator(temp));
}
else {
throw ParseError("Mismatched parenthesis");
}
}
else {
throw ParseError("Unexpected token");
}
}
}