mirror/musikcube
1
0
Fork 0
mirror of https://github.com/clangen/musikcube.git synced 2025-01-30 15:32:37 +00:00
Code Issues Packages Projects Releases Wiki Activity

Rearrange SqliteExtensions code to better support custom lowercase mappings.

Browse Source
This commit is contained in:
casey langen 2023-06-19 13:41:16 -07:00
parent d723f96360
commit a918ce29d6
1 changed files with 103 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

88
src/musikcore/db/SqliteExtensions.cpp
View File

@ -36,6 +36,7 @@
#pragma warning(push, 0)
#include <sqlite/sqlite3.h>
#include <utf8/utf8.h>
#include <musikcore/db/SqliteExtensions.h>
#pragma warning(pop)
@ -646,6 +647,52 @@ u32 sqlite3Utf8Read(
return it != accentToChar.end() ? it->second : c;
}
static inline int utf8bytes(u32 c) {
if (c < 0x80) { return 1; }
else if (c < 0x800) { return 2; }
else if (c < 0x10000) { return 3; }
return 4;
}
static inline void utf8fill(u32 c, uint8_t bytes[5]) {
memset((void*) bytes, 0, sizeof(uint8_t) * 5);
if (c < 0x80) {
bytes[0] = static_cast<uint8_t>(c);
}
else if (c < 0x800) {
bytes[0] = static_cast<uint8_t>((c >> 6) | 0xc0);
bytes[1] = static_cast<uint8_t>((c & 0x3f) | 0x80);
}
else if (c < 0x10000) {
bytes[0] = static_cast<uint8_t>((c >> 12) | 0xe0);
bytes[1] = static_cast<uint8_t>(((c >> 6) & 0x3f) | 0x80);
bytes[2] = static_cast<uint8_t>((c & 0x3f) | 0x80);
}
else { // four octets
bytes[0] = static_cast<uint8_t>((c >> 18) | 0xf0);
bytes[1] = static_cast<uint8_t>(((c >> 12) & 0x3f)| 0x80);
bytes[2] = static_cast<uint8_t>(((c >> 6) & 0x3f) | 0x80);
bytes[3] = static_cast<uint8_t>((c & 0x3f) | 0x80);
}
}
static int utf8strcspn(const char* str1, const char* str2) {
uint8_t bytes[5];
std::string needles(str2);
std::string::const_iterator begin = needles.begin();
std::string::const_iterator it = begin;
u32 str1len = strlen(str1);
const char* foundPos;
while (it != needles.end()) {
u32 c = utf8::unchecked::next(it);
utf8fill(c, bytes);
if ((foundPos = strstr(str1, (const char*) bytes)) != nullptr) {
return foundPos - str1;
}
}
return str1len;
}
/*
** Compare two UTF-8 strings for equality where the first string is
** a GLOB or LIKE expression. Return values:
@ -736,10 +783,14 @@ static int patternCompare(
** c but in the other case and search the input string for either
** c or cx.
*/
if (c <= 0x80) {
std::unordered_map<u32, const char*>& charToAccentsMap = charToAccentsInsensitive;
char zStop[3];
int bMatch;
bool bIsAscii = (c <= 0x80);
u32 nByteCount = utf8bytes(c);
if (bIsAscii || noCase) {
if (bIsAscii) {
if (noCase) {
zStop[0] = sqlite3Toupper(c);
zStop[1] = sqlite3Tolower(c);
@ -750,10 +801,20 @@ static int patternCompare(
zStop[0] = c;
zStop[1] = 0;
}
}
while (1) {
auto it = charToAccentsMap.find(c);
/* if we are doing a case insensitive search on a non-ascii character (utf8), then
use our special utf8strscpn to search */
if (!bIsAscii && noCase) {
if (it != charToAccentsMap.end()) {
zString += utf8strcspn((const char*)zString, it->second);
}
}
/* otherwise, we're searching for a regular ascii character... */
else {
/* see if we have a mapping from input character to a list of their
respective accented characters; if we do, use that mapping */
auto it = charToAccentsMap.find(c);
if (it != charToAccentsMap.end()) {
const char* stop = it->second;
zString += strcspn((const char*)zString, it->second);
@ -763,13 +824,17 @@ static int patternCompare(
else {
zString += strcspn((const char*)zString, zStop);
}
}
if (zString[0] == 0) break;
zString++;
zString += nByteCount;
bMatch = patternCompare(zPattern, zString, pInfo, matchOther);
if (bMatch != SQLITE_NOMATCH) return bMatch;
}
}
else {
/* if we fall through to here, and the character we're looking for is utf8 sequence,
go ahead and do a regular pattern compare. */
if (!bIsAscii) {
int bMatch;
while ((c2 = Utf8Read(zString)) != 0) {
if (c2 != c) continue;
@ -777,6 +842,7 @@ static int patternCompare(
if (bMatch != SQLITE_NOMATCH) return bMatch;
}
}
return SQLITE_NOWILDCARDMATCH;
}
if (c == matchOther) {
@ -822,9 +888,21 @@ static int patternCompare(
}
c2 = Utf8Read(zString);
if (c == c2) continue;
if (noCase && sqlite3Tolower(c) == sqlite3Tolower(c2) && c < 0x80 && c2 < 0x80) {
if (noCase) {
/* standard sqlite check */
if (sqlite3Tolower(c) == sqlite3Tolower(c2) && c < 0x80 && c2 < 0x80) {
continue;
}
/* check against our internal mappings */
auto it = charToAccentsInsensitive.find(c);
if (it != charToAccentsInsensitive.end()) {
uint8_t bytes[5];
utf8fill(c2, bytes);
if (utf8strcspn((const char*) bytes, it->second) < strlen((const char*) bytes)) {
continue;
}
}
}
if (c == matchOne && zPattern != zEscaped && c2 != 0) continue;
return SQLITE_NOMATCH;
}