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