lexical analyzer (Tokens)???
im having a problem solving the 6 errors i have will someone help me with this im stuck???!
lexical analyzer.cpp
lexical analyzer.cpp(36) : error C2065: 'token' : undeclared identifier
lexical analyzer.cpp(96) : error C2601: 'add_token' : local function definitions are illegal
lexical analyzer.cpp(113) : error C2143: syntax error : missing ';' before '{'
lexical analyzer.cpp(125) : error C2601: 'display' : local function definitions are illegal
lexical analyzer.cpp(136) : error C2601: 'add_premitives' : local function definitions are illegal
lexical analyzer.cpp(173) : error C2601: 'main' : local function definitions are illegal
Error executing cl.exe.
lexical analyzer.obj - 6 error(s), 0 warning(s) |
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#include<iostream>
#include<process.h>
#include<conio.h>
#include<string>
using namespace std;
// we are using singly linked list, because the symbol table DO NOT traverse backwardly.
// for simplisity, we are creating a symbol table for a premitive language which do no include procedures and functions.
// Its so limited according to the control structure. Thus, we did not include except the if, for statements.
// And its limited too that it does not take into consinderation the values of variables, types. because this is a lexical analayzer implementation project.
struct node
{
string data;
node* next;
};
class source_code
{
node* head;
public:
source_code()
{
head = NULL;
}
void display();
void add_lexeme(string);
~source_code();
};
void source_code::add_lexeme(string lexeme)
{
node* p = new node;
p->next = NULL;
p->data = token;
if (head = NULL)
head = p;
else
{
node* q = NULL;
for (q=head ; q->next != NULL ; q = q->next);
q->next = p;
p->next = NULL;
}
}
source_code::~source_code()
{
node* p;
while (head != NULL)
{
p = head;
head = head->next;
delete p;
}
head = NULL;
}
void source_code::display()
{
cout<<" ";
for (node* p = head ; p != NULL ; p = p->next)
{
cout << p->data;
cout << endl;
}
cout << endl;
}
class symbol_table
{
node* head;
public:
symbol_table()
{
head = NULL;
}
void display();
void add_token(string);
symbol_table add_premitives(symbol_table &);
bool lexical_analysis(string input);
~symbol_table();
};
bool symbol_table::lexical_analysis(string input)
{
source_code sc;
void symbol_table::add_token(string token)
{
node* p = new node;
p->next = NULL;
p->data = token;
if (head = NULL)
head = p;
else
{
node* q = NULL;
for (q=head ; q->next != NULL ; q = q->next);
q->next = p;
p->next = NULL;
}
}
symbol_table::~symbol_table()
{
node* p;
while (head != NULL)
{
p = head;
head = head->next;
delete p;
}
head = NULL;
}
void symbol_table::display()
{
cout<<" ";
for (node* p = head ; p != NULL ; p = p->next)
{
cout << p->data;
cout << endl;
}
cout << endl;
}
symbol_table symbol_table::add_premitives(symbol_table &st)
{
symbol_table::add_token("int DT");
symbol_table::add_token("char DT");
symbol_table::add_token("float DT");
symbol_table::add_token("double DT");
symbol_table::add_token("bool DT");
symbol_table::add_token("+ MOP");
symbol_table::add_token("- MOP");
symbol_table::add_token("* MOP");
symbol_table::add_token("/ MOP");
symbol_table::add_token("< ROP");
symbol_table::add_token("> ROP");
symbol_table::add_token("== ROP");
symbol_table::add_token("!= ROP");
symbol_table::add_token("<= ROP");
symbol_table::add_token(">= ROP");
symbol_table::add_token("&& LOP");
symbol_table::add_token("|| LOP");
symbol_table::add_token("if CSS");
symbol_table::add_token("for CSS");
symbol_table::add_token("0 const");
symbol_table::add_token("1 const");
symbol_table::add_token("2 const");
symbol_table::add_token("3 const");
symbol_table::add_token("4 const");
symbol_table::add_token("5 const");
symbol_table::add_token("6 const");
symbol_table::add_token("7 const");
symbol_table::add_token("8 const");
symbol_table::add_token("9 const");
return st;
}
void main()
{
symbol_table st;
st.display();
//st = st.add_premitives(st);
cout <<"Done successfully";
string input;
cin >> input;
while ( input != "exit")
{
// checking
cin >> input;
}
}
}
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The messages are telling you everything that you need to know. Hint: In the following function, where is token defined?
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void source_code::add_lexeme(string lexeme)
{
node* p = new node;
p->next = NULL;
p->data = token;
if (head = NULL)
head = p;
else
{
node* q = NULL;
for (q=head ; q->next != NULL ; q = q->next);
q->next = p;
p->next = NULL;
}
}
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