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http://www.hackerschool.org/HS_Boards/zboard.php?id=QNA_programming&no=6400 [복사]
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define NO_KEYWORDS 7
#define ID_LENGTH 12
char id[ID_LENGTH];
enum tsymbol { tnull = -1,
tnot, tnotequ, tmod, tmodAssign, tident, tnumber,
/* 0 1 2 3 4 5 */
tand, tlparen, trparen, tmul, tmulAssign, tplus,
/* 6 7 8 9 10 11 */
tinc, taddAssign, tcomma, tminus, tdec, tsubAssign,
/* 12 13 14 15 16 17 */
tdiv, tdivAssign, tsemicolon, tless, tlesse, tassign,
/* 18 19 20 21 22 23 */
tequal, tgreat, tgreate, tlbracket, trbracket, teof,
/* 24 25 26 27 28 29 */
// ...... word symnols ..................................... //
/* 30 31 32 33 34 35 */
tconst, telse, tif, tint, treturn, tvoid,
/* 36 37 38 39 */
twhile, tlbrace, tor, trbrace
};
struct tokenType {
int number; // token number
union {
char id[ID_LENGTH];
int num;
} value; // token value
};
char *keyword[NO_KEYWORDS] = {
"const", "else", "if", "int", "return", "void", "while"
};
enum tsymbol tnum[NO_KEYWORDS] = {
tconst, telse, tif, tint, treturn, tvoid, twhile
};
void lexicalError(int n)
{
printf(" *** Lexical Error : ");
switch (n) {
case 1 : printf("an identifier length must be less than 12.\n");
break;
case 2 : printf("next character must be &.\n");
break;
case 3 : printf("next character must be |.\n");
break;
case 4 : printf("invalid character!!!\n");
break;
}
}
int superLetter(char ch)
{
if(isalpha(ch) || ch == '_') return 1;
else return 0;
}
int superLetterOrDigit(char ch)
{
if (isalnum(ch) || ch == '_') return 1;
else return 0;
}
int hexValue(char ch)
{
switch (ch) {
case '0' : case '1' : case '2' : case '3' : case '4' :
case '5' : case '6' : case '7' : case '8' : case '9' :
return (ch - '0');
case 'A' : case 'B' : case 'C' : case 'D' : case 'E' : case 'F' :
return (ch - 'A' + 10);
case 'a' : case 'b' : case 'c' : case 'd' : case 'e' : case 'f' :
return (ch - 'a' + 10);
default : return -1;
}
}
int getIntNum(char firstCharacter, FILE* source_file)
{
int num = 0;
int value;
char ch;
if (firstCharacter != '0') { // decimal
ch = firstCharacter;
do {
num = 10*num + (int)(ch - '0');
ch = fgetc(source_file);
} while (isdigit(ch));
} else {
ch = fgetc(source_file);
if ((ch >= '0') && (ch <= '7')) // octal
do {
num = 8*num + (int)(ch - '0');
ch = fgetc(source_file);
} while ((ch >= '0') && (ch <= '7'));
else if ((ch == 'X') || (ch == 'X')) { // hexa decimal
while ((value = hexValue(ch=fgetc(source_file))) != -1)
num = 16 * num + value;
}
else num = 0; // zero
}
ungetc(ch,stdin); // retract
return num;
}
struct tokenType scanner(FILE* source_file)
{
struct tokenType token;
int i, index;
char ch;
token.number = tnull;
do {
while (isspace(ch= fgetc(source_file))); // state 1: 공백은 뛰어 넘기자.
if (superLetter(ch)) { // 식별자나 키워드가 있다면,
i=0;
do {
if (i<ID_LENGTH) id[i++] = ch;
ch = fgetc(source_file);
} while (superLetterOrDigit(ch));
if (i>=ID_LENGTH) lexicalError(1);
id[i] = '\0';
ungetc(ch, stdin); // retract
// find the identifier in the keyword table
for (index=0; index < NO_KEYWORDS; index++)
if (!strcmp(id, keyword[index])) break;
if (index < NO_KEYWORDS) // fount, keyword exit
token.number = tnum[index];
else { // not found, identifier exit
token.number = tident;
strcpy(token.value.id, id);
}
} // end of identifier or keyword
else if (isdigit(ch)) { // integer constant
token.number = tnumber;
token.value.num = getIntNum(ch, source_file);
}
else switch (ch) { // special character
case '/' : // state 10
ch = fgetc(source_file);
if (ch == '*') // text comment
do {
while (ch != '*') ch = fgetc(source_file);
ch = fgetc(source_file);
} while (ch != '/');
else if (ch == '/') // line comment
while (fgetc(source_file) != '\n');
else if (ch == '=') token.number = tdivAssign;
else { token.number = tdiv;
ungetc(ch, stdin); // retract
}
break;
case '!' : // state 17
ch = fgetc(source_file);
if (ch == '=') token.number = tnotequ;
else { token.number = tnot;
ungetc(ch, stdin); // retract
}
break;
case '%' : // state 20
ch = fgetc(source_file);
if (ch == '=')
token.number = tmodAssign;
else {
token.number = tmod;
ungetc(ch, stdin);
}
break;
case '&' : // state 23
ch = fgetc(source_file);
if (ch == '&') token.number=tand;
else { lexicalError(2);
ungetc(ch, stdin); // retract
}
break;
case '*' : // state 25
ch = fgetc(source_file);
if (ch == '=') token.number = tmulAssign;
else { token.number = tmul;
ungetc(ch, stdin); // retract
}
break;
case '+' : // state 28
ch = fgetc(source_file);
if (ch == '+') token.number = tinc;
else if (ch == '=') token.number = taddAssign;
else { token.number = tplus;
ungetc(ch, stdin); // retract
}
break;
case '-' : // stats 32
ch = fgetc(source_file);
if (ch == '-') token.number = tdec;
else if (ch == '=') token.number = tsubAssign;
else { token.number = tminus;
ungetc(ch, stdin); // retract
}
break;
case '<' : // state 36
ch = fgetc(source_file);
if (ch == '=') token.number = tlesse;
else { token.number = tless;
ungetc(ch, stdin); // retract
}
break;
case '=' : // state 39
ch = fgetc(source_file);
if (ch == '=') token.number = tequal;
else { token.number = tassign;
ungetc(ch, stdin); // retract
}
break;
case '>' : // state 42
ch = fgetc(source_file);
if (ch == '=') token.number = tgreate;
else { token.number = tgreat;
ungetc(ch, stdin); // retract
}
break;
case '|' : // state 45
ch = fgetc(source_file);
if (ch =='|') token.number = tor;
else { lexicalError(3);
ungetc(ch, stdin); // retract
}
break;
case '(' : token.number = tlparen; break;
case ')' : token.number = trparen; break;
case ',' : token.number = tcomma; break;
case ';' : token.number = tsemicolon; break;
case '[' : token.number = tlbracket; break;
case ']' : token.number = trbracket; break;
case '{' : token.number = tlbrace; break;
case '}' : token.number = trbrace; break;
case EOF : token.number = teof; break;
default : {
printf("Current character : %c", ch);
lexicalError(4);
break;
}
} // switch end
} while (token.number == tnull);
return token;
} // end of scanner
void main(int argc, char *argv[])
{
FILE *source_file;
int i;
struct tokenType token;
if (argc != 0) {
fprintf(stderr, "Usage : scanner <source file name>\n");
exit(1);
}
if((source_file = fopen(argv[1], "r")) == NULL) {
fprintf(stderr, "%s file not found \n", argv[1]);
exit(-1);
}
do {
for(i=0; i<ID_LENGTH; i++)
id[i]=' ';
token = scanner(source_file);
fprintf(stdout, "Token ---> ");
if(token.number == 5) {
for(i=0; i<ID_LENGTH; i++)
fprintf(stdout, "%c", id[i]);
fprintf(stdout, ": (%d, %d)\n", token.number, token.value.num);
}
else if(token.number == 4) {
for (i=0; i<ID_LENGTH; i++)
fprintf(stdout, "%c", id[i]);
fprintf(stdout, ": (%d, %s)\n", token.number, token.value.id);
}
else {
for (i=0; i<ID_LENGTH; i++)
fprintf(stdout, "%c", id[i]);
fprintf(stdout, ": (%d, 0)\n", token.number);
}
} while (!feof(source_file));
fclose(source_file);
}
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