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Lexical Analyzer for C Lang.
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Email
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| Submitted on: |
1/20/2008 11:28:01 PM |
| By: |
Samir Solanki
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| Level: |
Advanced |
| User Rating: |
By 4 Users |
| Compatibility: |
C++ (general), Microsoft Visual C++, Borland C++ |
| Views: |
29784 |
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(About the author) |
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Hello Programmers!!
I have made Lexical Analyzer for C in Turbo C 3.0
Rate me, if you like my code.
Contact me: solanki.samir@gmail.com
Happy Programming !!!
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By using this code, you agree to the following terms...
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Other 7 submission(s) by this author
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Other User Comments
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 1/21/2008 12:36:07 AM: Brenton A. Saunders
Nice!
(If this comment was disrespectful, please report it.)
| 5/29/2008 5:04:57 PM: Crowded Flowers
Um this is very poorly programmed. Your formatting is terrible, and its not even really a lexical analyzer. I suggest reading the book "Writing Compilers and interpreters" by Ronald Mak. This sites code makes me laugh..
(If this comment was disrespectful, please report it.)
| 11/12/2008 5:20:13 AM: hribek
i'd suggest "red dragon" book Compilers: Principles, Techniques, and Tools from Aho, Sethi, Ullman
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| 2/25/2009 5:55:47 AM: milos chmel
instead of writin in the middle ->
strcpy(defKey[0],"int"); strcpy(defKey[1],"float");
-> one writes in the initialization ->
char *defKey[] = {"int","float",""}; // "" to always recognize the end
better to avoid globals -> one can use scoping and static
if (1) {
int scoped = 2;
printf("scoped=%d", scoped);
if (2) {
int scoped = 3;
static int incremented = 2;
incremented++;
printf("local=%d scoped=%d", incremented, scoped);
}
// will fail - so delete it
printf("%d ", incremented);
//
printf("scoped=%d", scoped);
}
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| 2/25/2009 6:26:31 AM: milos chmel
example of use of stdlib to parse text ->
char alphabet[256+1];
char digits[10+1];
void
init(char *alphabet, char *digits) {
char *pa = alphabet, *pd = digits;
for (i =0 ;i < 256; ++i) {
if (isalpha(i)) {
*pa++ = i;
*pa = 0;
} else if (isdigit(i)) {
*pd++ = i;
*pd = 0;
}
}
}
enum {
INTEGER,
REAL,
OPERAND,
ERROR,
};
int
lex(char *y, int maxsiz, char *x) {
char sequence[256+1];
int length;
strcpy(sequence,".+-");
strcat(sequence,"eE");
strcat(sequence,d igits);
length = strspn(x, sequence);
if (0 < length) {
strncpy(y,x,maxsiz);
return strchr(x, ".eE")? REAL: INTEGER;
}
strcpy(sequence,alphabet);
strcat(sequence,digits);
strca t(sequence,"_");
length = strspn(x, sequence);
if (0 < length) {
strncpy(y,x,maxsiz);
return OPERAND;
}
return ERROR;
}
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| 2/28/2009 12:02:13 PM: milos chmel
strcpy(sequence,".+-");
strcat(sequence,"eE");
strcat(sequence,digits);
// can be written also as
strcat(strcat(strcpy(sequence,".+-"),"eE),digits);
// if You care about speed You can cache/store it somewhere in initialization
(If this comment was disrespectful, please report it.)
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