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/* gcc -O2 -Wall -pedantic dump-parser.c -o dump-parser
Usage: cat dump.sql | dump-parser
Or : dump-parser dump.sql
bugs :
* the parser will fail if the 10001st character of a line is an escaped quote, it will see it as an unescaped quote.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#define BUFFER 100000
bool is_escaped(char* string, int offset) {
if (offset == 0) {
return false;
} else if (string[offset - 1] == '\\') {
return !is_escaped(string, offset - 1);
} else {
return false;
}
}
bool is_commented(char* string) {
char buffer[4];
sprintf(buffer, "%.3s", string);
return strcmp(buffer, "-- ") == 0;
}
int main(int argc, char *argv[])
{
FILE* file = argc > 1 ? fopen(argv[1], "r") : stdin;
char buffer[BUFFER];
char* line;
int pos;
int parenthesis = 0;
bool quote = false;
bool escape = false;
bool comment = false;
while (fgets(buffer, BUFFER, file) != NULL) {
line = buffer;
/* skip commented */
if (comment || is_commented(line)) {
comment = line[strlen(line) - 1] != '\n';
fputs(line, stdout);
} else {
pos = 0;
nullchar:
while (line[pos] != '\0') {
/* if we are still in escape state, we need to check first char. */
if (!escape) {
/* find any character in ()' */
pos = strcspn(line, "()'\\");
}
if (pos > 0) {
/* print before match */
printf("%.*s", pos, line);
}
switch (line[pos]) {
case '(':
if (!quote) {
if (parenthesis == 0) {
putchar('\n');
}
parenthesis++;
}
if (escape) {
escape = false;
}
break;
case ')':
if (!quote) {
if (parenthesis > 0) {
parenthesis--;
} else {
/* whoops */
puts("\n");
fputs(line, stdout);
fputs("Found closing parenthesis without opening one.\n", stderr);
exit(1);
}
}
if (escape) {
escape = false;
}
break;
case '\\':
escape = !escape;
break;
case '\'':
if (escape) {
escape = false;
} else {
quote = !quote;
}
break;
case '\0':
goto nullchar;
default:
if (escape) {
escape = false;
}
break;
}
/* print char then skip it (to make sure we don’t double match) */
putchar(line[pos]);
line = line + pos + 1;
pos = 0;
}
}
}
return 0;
}
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