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220 lines
5.1 KiB
C++
220 lines
5.1 KiB
C++
/*
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* Written by Alexey Tourbin <at@altlinux.org>.
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*
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* The author has dedicated the code to the public domain. Anyone is free
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* to copy, modify, publish, use, compile, sell, or distribute the original
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* code, either in source code form or as a compiled binary, for any purpose,
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* commercial or non-commercial, and by any means.
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sqlite3.h>
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#include <pcrecpp.h>
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#include "pcrepp.hh"
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#include "sqlite-extension-func.h"
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typedef struct {
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char * s;
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pcrecpp::RE *re;
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} cache_entry;
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#ifndef CACHE_SIZE
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#define CACHE_SIZE 16
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#endif
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static
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pcrecpp::RE *find_re(sqlite3_context *ctx, const char *re)
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{
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static cache_entry cache[CACHE_SIZE];
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int i;
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int found = 0;
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for (i = 0; i < CACHE_SIZE && cache[i].s; i++) {
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if (strcmp(re, cache[i].s) == 0) {
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found = 1;
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break;
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}
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}
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if (found) {
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if (i > 0) {
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cache_entry c = cache[i];
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memmove(cache + 1, cache, i * sizeof(cache_entry));
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cache[0] = c;
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}
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}
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else {
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cache_entry c;
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c.re = new pcrecpp::RE(re);
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if (!c.re->error().empty()) {
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char *e2 = sqlite3_mprintf("%s: %s", re, c.re->error().c_str());
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sqlite3_result_error(ctx, e2, -1);
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sqlite3_free(e2);
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delete c.re;
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return NULL;
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}
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c.s = strdup(re);
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if (!c.s) {
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sqlite3_result_error(ctx, "strdup: ENOMEM", -1);
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delete c.re;
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return NULL;
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}
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i = CACHE_SIZE - 1;
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if (cache[i].s) {
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free(cache[i].s);
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assert(cache[i].re);
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delete cache[i].re;
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}
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memmove(cache + 1, cache, i * sizeof(cache_entry));
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cache[0] = c;
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}
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return cache[0].re;
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}
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static
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void regexp(sqlite3_context *ctx, int argc, sqlite3_value **argv)
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{
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const char *re, *str;
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pcrecpp::RE *reobj;
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assert(argc == 2);
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re = (const char *)sqlite3_value_text(argv[0]);
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if (!re) {
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sqlite3_result_error(ctx, "no regexp", -1);
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return;
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}
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str = (const char *)sqlite3_value_text(argv[1]);
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if (!str) {
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sqlite3_result_error(ctx, "no string", -1);
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return;
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}
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reobj = find_re(ctx, re);
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if (reobj == NULL)
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return;
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{
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bool rc = reobj->PartialMatch(str);
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sqlite3_result_int(ctx, rc);
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return;
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}
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}
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static
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void regexp_replace(sqlite3_context *ctx, int argc, sqlite3_value **argv)
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{
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const char *re, *str, *repl;
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pcrecpp::RE *reobj;
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assert(argc == 3);
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str = (const char *)sqlite3_value_text(argv[0]);
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if (!str) {
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sqlite3_result_error(ctx, "no string", -1);
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return;
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}
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re = (const char *)sqlite3_value_text(argv[1]);
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if (!re) {
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sqlite3_result_error(ctx, "no regexp", -1);
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return;
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}
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repl = (const char *)sqlite3_value_text(argv[2]);
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if (!repl) {
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sqlite3_result_error(ctx, "no string", -1);
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return;
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}
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reobj = find_re(ctx, re);
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if (reobj == NULL)
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return;
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{
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string dest(str);
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reobj->GlobalReplace(repl, &dest);
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sqlite3_result_text(ctx, dest.c_str(), dest.length(), SQLITE_TRANSIENT);
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return;
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}
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}
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static
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void sql_startswith(sqlite3_context *context,
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int argc, sqlite3_value **argv)
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{
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const char *str_in;
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const char *prefix;
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if ((sqlite3_value_type(argv[0]) == SQLITE_NULL) ||
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(sqlite3_value_type(argv[1]) == SQLITE_NULL)) {
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sqlite3_result_null(context);
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return;
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}
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str_in = (const char *)sqlite3_value_text(argv[0]);
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prefix = (const char *)sqlite3_value_text(argv[1]);
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if (strncmp(str_in, prefix, strlen(prefix)) == 0)
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sqlite3_result_int(context, 1);
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else
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sqlite3_result_int(context, 0);
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}
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static
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void sql_endswith(sqlite3_context *context,
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int argc, sqlite3_value **argv)
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{
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const char *str_in;
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const char *suffix;
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if ((sqlite3_value_type(argv[0]) == SQLITE_NULL) ||
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(sqlite3_value_type(argv[1]) == SQLITE_NULL)) {
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sqlite3_result_null(context);
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return;
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}
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str_in = (const char *)sqlite3_value_text(argv[0]);
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suffix = (const char *)sqlite3_value_text(argv[1]);
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int str_len = strlen(str_in);
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int suffix_len = strlen(suffix);
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if (str_len < suffix_len) {
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sqlite3_result_int(context, 0);
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}
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else if (strcmp(&str_in[str_len - suffix_len], suffix) == 0) {
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sqlite3_result_int(context, 1);
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}
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else {
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sqlite3_result_int(context, 0);
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}
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}
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int string_extension_functions(const struct FuncDef **basic_funcs,
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const struct FuncDefAgg **agg_funcs)
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{
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static const struct FuncDef string_funcs[] = {
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{ "regexp", 2, 0, SQLITE_UTF8, 0, regexp },
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{ "regexp_replace", 3, 0, SQLITE_UTF8, 0, regexp_replace },
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{ "startswith", 2, 0, SQLITE_UTF8, 0, sql_startswith },
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{ "endswith", 2, 0, SQLITE_UTF8, 0, sql_endswith },
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{ NULL }
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};
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*basic_funcs = string_funcs;
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return SQLITE_OK;
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}
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