flexfile.l

%{
#include <bits/stdc++.h>
#define dbg(x) printf("\n--bug: %d --\n",x)
#define  MXX 53

using namespace std;

struct tokens{

    string id;
    string key;
    struct tokens *next;

}*heads[MXX],*temp,*prv,*dummy;

int bg=1;
int line_cnt=1;
bool search(string x,string y)
{
    for(int i=0;i<MXX;i++)
    {
        temp=heads[i];
        while(temp!=NULL)
        {
            if(temp->id==x && temp->key==y)
            {
                return true;
            }
            temp=temp->next;
        }
    }
    return false;
}

int hashkey(string x)
{
    int sum=0;
    for(int i=0;i<x.size();i++)
    {
        sum+=x[i];
    }
    return sum%MXX;
}


void insert(string x,string y)
{
    bool exist=search(x,y);
    if(exist==false)
    {
        int position=hashkey(x);
        temp=heads[position];

        if(temp==NULL)   //if list is empty
        {
            dummy = new tokens;

            dummy->id=x;
            dummy->key=y;
            dummy->next=NULL;

            heads[position]=dummy;

        }
        else
        {

            dummy=new tokens;
            dummy->id=x;
            dummy->key=y;
            dummy->next= heads[position];
            heads[position]=dummy;

        }

    }
    else {

        printf("Already exits\n\n");
    }
}


void del(string x,string y)
{
    int i=hashkey(x);
    if(heads[i]==NULL) return;
    temp=heads[i];
    prv=heads[i];

      if(heads[i]->id==x && heads[i]->key==y)
      {
        heads[i]=heads[i]->next;
        delete(temp);
        return;
      }


        while(temp!=NULL)
        {
            if(temp->id==x && temp->key==y)
            {
                printf("Successfully Deleted\n");
                prv->next=temp->next;
                delete(temp);
                return;
            }
            prv=temp;
            temp=temp->next;
        }


}

void update(string x, string y, string nw)
{
        int i=hashkey(x);
        temp=heads[i];

        while(temp!=NULL)
        {
            if(temp->id==x && temp->key==y)
            {
                printf("Successfully Updated\n");
                temp->key=nw;
            }

            temp=temp->next;
        }


}

void show()
{
    printf("======Showing the contents======\n\n");


     for(int i=0;i<MXX;i++)
    {
        temp=heads[i];
        if(temp==NULL) continue;
        printf("Link %d : ",i);

        while(temp!=NULL)
        {
            cout<<"< "<<temp->id<<" , "<<temp->key <<" >  ";
            temp=temp->next;
        }
        cout<<endl;
        cout<<endl;
    }
}

%}
see (dekhao)
keyword (program)|(if)|(not)|(end)|(begin)|(else)|(then)|(do)|(while)|(funtion)|(Procedure)|(integer)|(real)|(var)|(oh)|(array)|(write)
variable        [a-zA-Z_]{1}[a-zA-Z0-9_]{0,31}
integer         [+-]?[1-9][0-9]*
float           [+-]?[0-9]*\.[0-9]*
exponent    [+-]?[1-9](\.[0-9]+)[E][-+]?[0-9]+
single_comment      (\/\/).*
multi_comment       \/[*].*[*]\/|\/[*](.*(\n).*)[*]\/
pascal_comment       \{(.*)\}
string              \".*\"
newline            [\n]
relop              (=)|(==)|(<>)|(<)|(<=)|(>=)|(>)
addop              [+-]|(or)
mulop              [*/]|(div)|(mod)|(and)
assignop           :=
dotdot             (\.\.)
comma              ,
semicolon          ;
colon              :


%%
{see}           {show();}
{newline}       {line_cnt++;}

{single_comment}    {cout<<"Single line C/C++ Comment"<<endl;}
{multi_comment}     {cout<<"Multiline C/C++ Comment"<<endl;}
{pascal_comment}    {cout<<"Pascal Comment"<<endl;}

{keyword}       {cout<<"Keyword: "<<yytext<<" at line: "<<line_cnt<<endl;}
{variable}      {cout<<"Varibale: "<<yytext<<endl; insert(yytext,"KEYWORD"); }
{string}        {cout<<"String: "<<yytext<<" at line: "<<line_cnt<<endl;}

{integer}       {cout<<"Integer number: "<<yytext<<endl; insert(yytext,"integer");}
{float}         {cout<<"Float number: "<<yytext<<endl; insert(yytext,"float");}
{exponent}      {cout<<"Exponent number: "<<yytext<<endl; insert(yytext,"exponent");}

{relop}         {cout<<"Relational Operator: "<<yytext<<endl; insert(yytext,"RELOP");}
{addop}         {cout<<"Addition Operator: "<<yytext<<endl; insert(yytext,"ADDOP");}
{mulop}         {cout<<"Multiplier Operator: "<<yytext<<endl; insert(yytext,"MULOP");}
{assignop}      {cout<<"Assign Operator: "<<yytext<<endl;insert(yytext,"ASSIGNOP");}
{dotdot}        {cout<<"DOT DOT: "<<yytext<<endl;insert(yytext,"DOTDOT");}

{comma}             {cout<<"Comma: "<<yytext<<endl;}
{semicolon}         {cout<<"semicolon: "<<yytext<<endl;}
{colon}             {cout<<"colon: "<<yytext<<endl;}

%%
int main()
{
    yylex();
    cout<<"\nTotal Lines: "<<line_cnt<<endl;
    return 0;
}