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hash.c
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hash.c
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#include "lexer.h"
typedef struct
{
char key[TOKEN_SIZE];
char value[TOKEN_SIZE+3];
//struct table_entry* next;
}table_entry;
int keyword_table_size=100;
table_entry keyword_table[100];
int hash(char str[TOKEN_SIZE])//,int keyword_table_size)
{
int i=0,sum=0;
while(str[i]!='\0')
{
sum+=str[i];
i++;
}
return sum%keyword_table_size;
}
void initialize(table_entry* next)
{
strcpy(next->key,"-1");
strcpy(next->value,"-1");
//next->next=NULL;
}
void add_keyword_table(char key[TOKEN_SIZE],char value[TOKEN_SIZE])
{
printf("%s\n",key );
int index=hash(key);
printf("%d\n",index );
if(strcmp(keyword_table[index].key,"-1")!=0)
{
int j=index+1;
for(;j!=index;)
{
if(strcmp(keyword_table[j].key,"-1")==0)
{
index=j;
break;
}
j=j+1<100?j+1:0;
}
}
table_entry* temp=&keyword_table[index];
/*while(temp->next!=NULL)
{
temp=temp->next;
}*/
strcpy(temp->key,key);
strcpy(temp->value,value);
//temp->next=(table_entry*)malloc(sizeof(table_entry));
//initialize(temp->next);//->next=NULL;
}
char* find_keyword_table(char key[TOKEN_SIZE])
{
int index=hash(key);
printf("%d\n", index);
/*table_entry* temp=&keyword_table[index];
table_entry* prev=NULL;//keyword_table[index];
while(temp->next!=NULL)
{
prev=temp;
temp=temp->next;
}
if(prev!=NULL)
return prev->value;
else
return "-1";*/
int j=index,flag=0,i=0;
for(i=0;i<100;i++)
{
if(strcmp(keyword_table[j].key,key)==0)
{
index=j;
flag=1;
break;
}
j=j+1<100?j+1:0;
}
if(flag==1)
return keyword_table[index].value;
else
return "-1";
}
int main()
{
for(int i=0;i<100;i++)
{
strcpy(keyword_table[i].key,"-1");
//keyword_table[i].next=NULL;
}
add_keyword_table("with","TK_WITH");
add_keyword_table("parameters","TK_PARAMETERS");
add_keyword_table("end","TK_END");
add_keyword_table("while","TK_WHILE");
add_keyword_table("type","TK_TYPE");
add_keyword_table("_main","TK_MAIN");
add_keyword_table("global","TK_GLOBAL");
add_keyword_table("parameter","TK_PARAMETER");
add_keyword_table("list","TK_LIST");
add_keyword_table("input","TK_INPUT");
add_keyword_table("output","TK_OUTPUT");
add_keyword_table("int","TK_INT");
add_keyword_table("real","TK_REAL");
add_keyword_table("endwhile","TK_ENDWHILE");
add_keyword_table("if","TK_IF");
add_keyword_table("then","TK_THEN");
add_keyword_table("endif","TK_ENDIF");
add_keyword_table("read","TK_READ");
add_keyword_table("write","TK_WRITE");
add_keyword_table("return","TK_RETURN");
add_keyword_table("call","TK_CALL");
add_keyword_table("record","TK_RECORD");
add_keyword_table("endrecord","TK_ENDRECORD");
add_keyword_table("else","TK_ELSE");
for(int i=0;i<100;i++)
{
printf("%s\t%d\n",keyword_table[i].key,i);
//if(keyword_table[i].next!=NULL)
{
// printf("%s\n",keyword_table[i].next->key);
}
}
//add_keyword_table("","");
//add_keyword_table("","");
//add_keyword_table("","");
//add_keyword_table("","");
printf("%s\n",find_keyword_table("with"));
printf("%s\n",find_keyword_table("type"));
return 0;
}