NodeWrite* Parser::ParseWrite(bool isFirst, bool isWriteln)
{
NodeWrite* ans = NULL;
t = sc.GetNextToken();
if (isFirst)
t = RequireToken("(", "\"(\" expected");
if (t.GetType() == string_const)
{
ans = new NodeWriteStr(STR, "\""+t.GetValue().substr(1, t.GetValue().size()-2)+"\"");
t = sc.GetNextToken();
}
else
{
NodeExpression* exp = ParseComparision();
OutputType T;
if (exp->GetType()->IsInt())
T = INT;
else
T = FLOAT;
ans = new NodeWriteExp(T, exp);
}
if (t.GetValue() == ",")
ans->SetNext(ParseWrite(false, isWriteln));
else
{
t = RequireToken(")", "\")\" expected");
if (isWriteln)
ans->SetNext(new NodeWriteln());
}
return ans;
}
internal bool
ParseIdentifier(tokenizer *Tokenizer, std::string *Member)
{
if(RequireToken(Tokenizer, Token_Equals))
{
token Token = GetToken(Tokenizer);
switch(Token.Type)
{
case Token_String:
{
std::string String;
for(int Index = 0; Index < Token.TextLength; ++Index)
String += Token.Text[Index];
*Member = String;
return true;
} break;
default:
{
ReportInvalidRule("Expected token of type Token_String: '" + std::string(Token.Text, Token.TextLength) + "'");
} break;
}
}
else
{
ReportInvalidRule("Expected token: '='");
}
return false;
}
NodeCall* Parser::ParseSub(SymProc* sym)
{
vector<NodeExpression*> params;
int size = sym->GetArgNames()->size();
if (size != 0)
{
for (int i=0; i<size && t.GetValue() != ")"; ++i)
{
t = sc.GetNextToken();
NodeExpression* p = ParseExpression();
SymTable* st = sym->GetArgTable();
SymVarParam* h = (SymVarParam*)(st->find((*(sym->GetArgNames()))[i])->second);
NodeExpression* help = new NodeExpression(h);
help->SetType(h->GetType());
if (p->GetType()->IsScalar() && h->GetType()->IsScalar())
CheckTypes(help, p, true);
else
if (GetRootType(p->GetType()) != GetRootType(help->GetType()))
throw Error("impossible cast types", t);
params.push_back(p);
}
t = RequireToken(")" , "\")\" expected");
}
if (params.size() != size)
throw Error("incorrect number of parameters", t);
NodeCall* func = new NodeCall(sym, params);
if (sym->IsFunc())
func->SetType(sym->GetType());
return func;
}
void Parser::ParseVarDecl()
{
t = sc.GetNextToken();
while (true){
vector<string> names;
do
{
Token t1 = t;
t = sc.GetNextToken();
if (t1.GetType() != identifier && t1.GetValue() != "," && t1.GetValue() != ":")
throw Error("incorrect variable declaration", t);
if (t1.GetType() == identifier)
names.push_back(t1.GetValue());
}
while(t.GetValue() != ":");
SymType* Type = ParseType(false);
for (vector<string>::iterator it = names.begin(); it != names.end(); ++it)
{
TableStack.Find((*it), t);
SymVarGlobal* s = new SymVarGlobal(*it, Type);
table->insert(pair<string, SymVarGlobal*>(*it, s));
s->print(os, IsExplType(Type->GetName()));
os<<endl;
}
names.clear();
t = sc.GetNextToken();
t = RequireToken(";" , "\";\" expected");
if (t.GetValue() == "type" || t.GetValue() == "const" || t.GetValue() == "procedure" || t.GetValue() == "function"
|| t.GetValue() == "begin" || t.GetValue() == "EOF")
return;
if (t.GetValue() == "var")
t = sc.GetNextToken();
}
}
SymTable* Parser::ParseRecDecl(vector<string>* &flds)
{
vector<string> names;
Token t1 = sc.GetNextToken();
t = t1;
SymTable* fldTable = new SymTable();
while(t.GetValue() != "end")
{
do
{
t1 = t;
t = sc.GetNextToken();
if (t1.GetType() != identifier && t1.GetValue() != "," && t1.GetValue() != ":")
throw Error("incorrect record declaration", t);
if(t1.GetType() == identifier)
{
Check(t1.GetValue(), fldTable);
names.push_back(t1.GetValue());
}
}
while(t.GetValue() != ":");
SymType* type = ParseType(false);
for (vector<string>::iterator it = names.begin(); it != names.end(); ++it)
{
if (fldTable->find(*it) != fldTable->end())
throw Error("incorrect record declaration", t);
fldTable->insert(SymElem (*it, new SymVarLocal(*it, type)));
flds->push_back((*it));
}
names.clear();
t = sc.GetNextToken();
t = RequireToken(";" , "\";\" expected");
}
return fldTable;
}
SymTypeArray* Parser::ParseArray()
{
t = sc.GetNextToken();
if (t.GetValue() != "[")
throw Error ("incorrect array declaration",t);
vector<pair<int, int>> range;
do
{
t = sc.GetNextToken();
SymVarConst* l = ParseConst();
t = sc.GetNextToken();
t = RequireToken(".." , "incorrect array declaration");
SymVarConst* r = ParseConst();
if(!r->GetType()->IsInt() || !l->GetType()->IsInt())
throw Error("incorrect bounds in array declaration", t);
int ll = atoi(l->GetValue().c_str());
int rr = atoi(r->GetValue().c_str());
t = sc.GetNextToken();
range.push_back(pair<int, int>(ll,rr));
}
while(t.GetValue() != "]");
t =sc.GetNextToken();
if (t.GetValue() != "of")
throw Error("incorrect array declaration : \"of\" exprected", t);
SymType* Type = ParseType(false);
SymTypeArray* arrType = NULL;
for (vector<pair<int, int>>::iterator it = range.begin(); it != range.end(); ++it)
{
arrType = new SymTypeArray(IntToStr(NotExplType++), Type, (*it).first, (*it).second);
Type = arrType;
}
return arrType;
}
StatementAssign* Parser::ParseAssignment()
{
NodeExpression* left = ParseExpression();
if (!left->IsLValue())
throw Error("incorrect assign operation", t);
t = RequireToken(":=" , "\":=\" expected");
NodeExpression* right = ParseComparision();
CheckTypes(left, right, true);
return new StatementAssign(left, right);
}
StatementWhile* Parser::ParseWhile()
{
NodeExpression* expr = NULL;
NodeStatement* body = NULL;
t = sc.GetNextToken();
expr = ParseComparision();
if (!expr->GetType()->IsInt())
throw Error("Ordinal expression expected", t);
t = RequireToken("do" , "\"do\" expected");
body = ParseElement();
return new StatementWhile(expr, body);
}
StatementBlock* Parser::ParseBlock()
{
block StmsList;
t = sc.GetNextToken();
while (t.GetValue() != "end")
{
StmsList.push_back(ParseElement());
if (t.GetValue() != "end")
t = RequireToken(";", "\";\" expected");
}
t = sc.GetNextToken();
return new StatementBlock(StmsList);
}
StatementIf* Parser::ParseIf()
{
NodeExpression* con = NULL;
NodeStatement* then_block = NULL;
NodeStatement* else_block = NULL;
t = sc.GetNextToken();
con = ParseComparision();
if (!con->GetType()->IsInt())
throw Error("Ordinal expression expected", t);
t = RequireToken("then", "\"then\" expected");
then_block = ParseElement();
if (t.GetValue() != "else")
return new StatementIf(con, then_block);
t = sc.GetNextToken();
else_block = ParseElement();
return new StatementIfElse(con, then_block, else_block);
}
StatementRepeat* Parser::ParseRepeat()
{
NodeExpression* expr = NULL;
NodeStatement* body = NULL;
block StmsList;
t = sc.GetNextToken();
while (t.GetValue() != "until")
{
StmsList.push_back(ParseElement());
if (t.GetValue() != "until")
t = RequireToken(";", "statement error");
}
body = new StatementBlock(StmsList);
t = sc.GetNextToken();
expr = ParseComparision();
if (!expr->GetType()->IsInt())
throw Error("Ordinal expression expected", t);
return new StatementRepeat(expr, body);
}
StatementFor* Parser::ParseFor()
{
NodeExpression* expr;
NodeStatement* body;
StatementAssign* assign;
bool isDownto = false;
t = sc.GetNextToken();
assign = ParseAssignment();
if (!assign->GetType()->IsInt())
throw Error("Ordinal expression expected", t);
if (t.GetValue() == "downto")
isDownto = true;
else
if (t.GetValue() != "to")
throw Error("\"to\" or \"downto\" expected", t);
t = sc.GetNextToken();
expr = ParseComparision();
if (!expr->GetType()->IsInt())
throw Error("ordinal expression expected", t);
t = RequireToken("do", "\"do\" expected");
body = ParseElement();
return new StatementFor(expr, body, assign, isDownto);
}
void Parser::ParseConstDecl()
{
t = sc.GetNextToken();
while(true)
{
Token t1 = t;
t = sc.GetNextToken();
if (t1.GetType() != identifier || t.GetValue() != "=")
throw Error("wrong Const Decl", t);
TableStack.Find(t1.GetValue(), t);
t = sc.GetNextToken();
SymVarConst* Type = ParseConst();
Type->SetName(t1.GetValue());
table->insert(pair<string, SymVarConst*> (t1.GetValue(), Type));
Type->print(os,true);
t = sc.GetNextToken();
t = RequireToken(";", "; expected");
if (t.GetValue() == "var" || t.GetValue() == "type" || t.GetValue() == "procedure" || t.GetValue() == "function"
|| t.GetValue() == "begin" || t.GetValue() == "EOF")
return;
if (t.GetValue() == "const")
t = sc.GetNextToken();
}
}
internal bool
ParseProperties(tokenizer *Tokenizer, window_properties *Properties)
{
if(RequireToken(Tokenizer, Token_Equals))
{
if(RequireToken(Tokenizer, Token_OpenBrace))
{
Properties->Scratchpad = -1;
Properties->Display = -1;
Properties->Space = -1;
Properties->Float = -1;
bool ValidState = true;
while(ValidState)
{
token Token = GetToken(Tokenizer);
switch(Token.Type)
{
case Token_SemiColon: { continue; } break;
case Token_CloseBrace: { ValidState = false; } break;
case Token_Identifier:
{
if(TokenEquals(Token, "float"))
{
std::string Value;
if(ParseIdentifier(Tokenizer, &Value))
{
if(Value == "true")
Properties->Float = 1;
else if(Value == "false")
Properties->Float = 0;
}
}
else if(TokenEquals(Token, "display"))
{
std::string Value;
if(ParseIdentifier(Tokenizer, &Value))
Properties->Display = ConvertStringToInt(Value);
}
else if(TokenEquals(Token, "space"))
{
std::string Value;
if(ParseIdentifier(Tokenizer, &Value))
Properties->Space = ConvertStringToInt(Value);
}
else if(TokenEquals(Token, "scratchpad"))
{
std::string Value;
if(ParseIdentifier(Tokenizer, &Value))
{
if(Value == "visible")
Properties->Scratchpad = 1;
else if(Value == "hidden")
Properties->Scratchpad = 0;
}
}
else if(TokenEquals(Token, "role"))
{
std::string Value;
if(ParseIdentifier(Tokenizer, &Value))
Properties->Role = Value;
}
} break;
default: { ReportInvalidRule("Expected token of type Token_Identifier: '" + std::string(Token.Text, Token.TextLength) + "'"); } break;
}
}
return true;
}
else
{
ReportInvalidRule("Expected token '{'");
}
}
else
{
ReportInvalidRule("Expected token '='");
}
return false;
}
NodeExpression* Parser::ParseFactor()
{
NodeExpression* r = NULL;
if (t.GetValue() == "-" || t.GetValue() == "+" || t.GetValue() == "not")
{
string op = t.GetValue();
t = sc.GetNextToken();
NodeExpression* _r = ParseFactor();
r = new NodeUnaryOp(new Symbol(op), _r);
r->SetType(_r->GetType());
}
else
{
if (t.GetValue() != "(" && t.GetType() != identifier && t.GetType() != int_const_dec && t.GetType() != float_const)
throw Error("Syntax error : unexpected \""+t.GetValue()+"\";", t);
if(t.GetValue() == "(")
{
t = sc.GetNextToken();
r = ParseComparision();
t = RequireToken(")" , "\")\" expected");
}
switch(t.GetType()){
case int_const_dec : case float_const:
{
SymVarConst* _const = new SymVarConst(t.GetValue(), t.GetValue(), NULL);
if (t.GetType() == int_const_dec)
_const->SetType((SymType*)mainTable->find("integer")->second);
else
_const->SetType((SymType*)mainTable->find("real")->second);
t = sc.GetNextToken();
r = new NodeConst(_const);
r->SetType(_const->GetType());
return r;
break;
}
case identifier:
{
Token t1 = t;
bool found = false;
_Table::iterator it = TableStack.Find(t1.GetValue(), found);
if (!found)
throw Error("unknown identifier", t);
t = sc.GetNextToken();
SymVar* name = (SymVar*)it->second;
SymType* Type = name->GetType();
if (t.GetValue() == "(")
{
if (!it->second->IsFunc())
throw Error("unexpected identifier", t);
if (((SymFunc*)it->second)->IsForward())
throw Error("undefined forward ("+it->second->GetName()+")", t);
r = ParseSub((SymFunc*)it->second);
}
else
if(name->GetType()->IsRec() || name->GetType()->IsArr())
{
r = new NodeVar(name);
r->SetType(Type);
while(name->GetType()->IsRec() || name->GetType()->IsArr())
{
SymVar* name2 = name;
if (name->GetType()->IsRec())
r = ParseRec(r, name);
if (name->GetType()->IsArr())
r = ParseArr(r,name);
if (name2 == name)
break;
}
}
else
{
if (name->IsConst())
r = new NodeConst(it->second);
else
r = new NodeVar(it->second);
r->SetType(Type);
}
break;
}
}
}
return r;
}
SymProc* Parser::ProcFunc(bool isFunc)
{
t = sc.GetNextToken();
SymType* Type = NULL;
SymProc* sub = NULL;
if (t.GetType() != identifier)
throw Error("incorrect procedure name", t);
SymTable* argTable = NULL;
vector<string>* argNames = new vector<string>;
_Table::iterator it = table->find(t.GetValue());
string name = t.GetValue();
t = sc.GetNextToken();
argTable = ParseArguments(argNames);
TableStack.PushTable(argTable);
if (isFunc)
{
if (t.GetValue() != ":")
throw Error("type expected", t);
Type = ParseType(false);
t = sc.GetNextToken();
}
t = RequireToken(";", "\";\" expected");
if (it != table->end())
{
if (!(it->second->IsProc()) || !(((SymProc*)it->second)->IsForward()))
throw Error("incorrect procedure definition", t);
SymTable* argTableF = ((SymProc*)it->second)->GetArgTable();
vector<string>* argNamesF = ((SymProc*)it->second)->GetArgNames();
for (size_t i=0; i<argNames->size(); ++i)
{
if ((*argNames)[i] != (*argNamesF)[i] ||
!SymComp(argTable->find((*argNames)[i])->second , argTableF->find((*argNamesF)[i])->second))
throw Error("Header does not match previouse definition", t);
}
if (isFunc)
sub = ParseProcDecl(name, argNames, argTable, true, Type);
else
sub = ParseProcDecl(name, argNames, argTable, false, Type);
t = RequireToken(";", "\";\" expected");
}
else
{
if (t.GetValue() == "forward")
{
t = sc.GetNextToken();
if (t.GetValue() != ";")
throw Error("\";\" expected", t);
if (isFunc)
{
sub = new SymFunc(name, argNames, argTable, NULL, true, NULL);
((SymFunc*)sub)->SetType(Type);
}
else
sub = new SymProc(name, argNames, argTable, NULL, true);
sub->print(os, false);
table->insert(pair<string, SymProc*> (name, sub));
TableStack.PopTable();
}
else
{
sub = ParseProcDecl(name, argNames, argTable, isFunc, Type);
if (isFunc)
((SymFunc*)sub)->SetType(Type);
sub->GetBody()->print(os, 0);
}
t = sc.GetNextToken();
}
return sub;
}
