--- /dev/null
+
+/*
+** This file implements an integration between the ICU library
+** ("International Components for Unicode", an open-source library
+** for handling unicode data) and SQLite. The integration uses
+** ICU to provide the following to SQLite:
+**
+** * Implementations of the SQL scalar upper() and lower()
+** functions for case mapping,
+**
+** * Collation sequences
+**
+** * Implementation of the SQL regexp() function (and hence REGEXP
+** operator) using the ICU uregex_XX() APIs.
+**
+** * LIKE
+*/
+
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU)
+
+#include <unicode/utypes.h>
+#include <unicode/uregex.h>
+#include <unicode/ustring.h>
+
+#include <assert.h>
+#include "sqlite3.h"
+
+#ifndef SQLITE_CORE
+ #include "sqlite3ext.h"
+ SQLITE_EXTENSION_INIT1
+#endif
+
+/*
+** Collation sequences:
+**
+** ucol_open()
+** ucol_strcoll()
+** ucol_close()
+*/
+
+/*
+** Version of sqlite3_free() that is always a function, never a macro.
+*/
+static void xFree(void *p){
+ sqlite3_free(p);
+}
+
+/*
+** Function to delete compiled regexp objects. Registered as
+** a destructor function with sqlite3_set_auxdata().
+*/
+static void icuRegexpDelete(void *p){
+ URegularExpression *pExpr = (URegularExpression *)p;
+ uregex_close(pExpr);
+}
+
+/*
+** Implementation of SQLite REGEXP operator. This scalar function takes
+** two arguments. The first is a regular expression pattern to compile
+** the second is a string to match against that pattern. If either
+** argument is an SQL NULL, then NULL Is returned. Otherwise, the result
+** is 1 if the string matches the pattern, or 0 otherwise.
+**
+** SQLite maps the regexp() function to the regexp() operator such
+** that the following two are equivalent:
+**
+** zString REGEXP zPattern
+** regexp(zPattern, zString)
+**
+** Uses the following ICU regexp APIs:
+**
+** uregex_open()
+** uregex_matches()
+** uregex_close()
+*/
+static void icuRegexpFunc(sqlite3_context *p, int nArg, sqlite3_value **apArg){
+ UErrorCode status = U_ZERO_ERROR;
+ URegularExpression *pExpr;
+ UBool res;
+ const UChar *zString = sqlite3_value_text16(apArg[1]);
+
+ /* If the left hand side of the regexp operator is NULL,
+ ** then the result is also NULL.
+ */
+ if( !zString ){
+ return;
+ }
+
+ pExpr = sqlite3_get_auxdata(p, 0);
+ if( !pExpr ){
+ const UChar *zPattern = sqlite3_value_text16(apArg[0]);
+ if( !zPattern ){
+ return;
+ }
+ pExpr = uregex_open(zPattern, -1, 0, 0, &status);
+
+ if( U_SUCCESS(status) ){
+ sqlite3_set_auxdata(p, 0, pExpr, icuRegexpDelete);
+ }else{
+ assert(!pExpr);
+ sqlite3_result_error(p, "Error compiling regular expression", -1);
+ return;
+ }
+ }
+
+ /* Configure the text that the regular expression operates on. */
+ uregex_setText(pExpr, zString, -1, &status);
+ if( !U_SUCCESS(status) ){
+ sqlite3_result_error(p, "Error configuring regular expression", -1);
+ return;
+ }
+
+ /* Attempt the match */
+ res = uregex_matches(pExpr, 0, &status);
+ if( !U_SUCCESS(status) ){
+ sqlite3_result_error(p, "Error matching regular expression", -1);
+ return;
+ }
+
+ /* Set the text that the regular expression operates on to a NULL
+ ** pointer. This is not really necessary, but it is tidier than
+ ** leaving the regular expression object configured with an invalid
+ ** pointer after this function returns.
+ */
+ uregex_setText(pExpr, 0, 0, &status);
+
+ /* Return 1 or 0. */
+ sqlite3_result_int(p, res ? 1 : 0);
+}
+
+/*
+** Implementations of scalar functions for case mapping - upper() and
+** lower(). Function upper() converts it's input to upper-case (ABC).
+** Function lower() converts to lower-case (abc).
+**
+** ICU provides two types of case mapping, "general" case mapping and
+** "language specific". Refer to ICU documentation for the differences
+** between the two.
+**
+** To utilise "general" case mapping, the upper() or lower() scalar
+** functions are invoked with one argument:
+**
+** upper('ABC') -> 'abc'
+** lower('abc') -> 'ABC'
+**
+** To access ICU "language specific" case mapping, upper() or lower()
+** should be invoked with two arguments. The second argument is the name
+** of the locale to use. Passing an empty string ("") or SQL NULL value
+** as the second argument is the smae as invoking the 1 argument version
+** of upper() or lower().
+**
+** lower('I', 'en_us') -> 'i'
+** lower('I', 'tr_tr') -> 'ı' (small dotless i)
+*/
+static void icuCaseFunc16(sqlite3_context *p, int nArg, sqlite3_value **apArg){
+ const UChar *zInput;
+ UChar *zOutput;
+ int nInput;
+ int nOutput;
+
+ UErrorCode status = U_ZERO_ERROR;
+ const char *zLocale = 0;
+
+ assert(nArg==1 || nArg==2);
+ if( nArg==2 ){
+ zLocale = (const char *)sqlite3_value_text(apArg[1]);
+ }
+
+ zInput = sqlite3_value_text16(apArg[0]);
+ nInput = sqlite3_value_bytes16(apArg[0]);
+
+ nOutput = nInput * 2 + 2;
+ zOutput = sqlite3_malloc(nInput*2+2);
+ if( !zOutput ){
+ return;
+ }
+
+ if( sqlite3_user_data(p) ){
+ u_strToUpper(zOutput, nOutput/2, zInput, nInput/2, zLocale, &status);
+ }else{
+ u_strToLower(zOutput, nOutput/2, zInput, nInput/2, zLocale, &status);
+ }
+
+ if( !U_SUCCESS(status) ){
+ sqlite3_result_error(p, "Error converting case", -1);
+ return;
+ }
+
+ sqlite3_result_text16(p, zOutput, -1, xFree);
+}
+
+/*
+** Register the ICU extension functions with database db.
+*/
+int sqlite3IcuInit(sqlite3 *db){
+ int rc;
+ int ii;
+ struct IcuScalar {
+ const char *zName;
+ int nArg;
+ int enc;
+ void *pContext;
+ void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
+ } scalars[] = {
+ {"regexp", 2, SQLITE_ANY, 0, icuRegexpFunc},
+
+ {"lower", 1, SQLITE_UTF16, 0, icuCaseFunc16},
+ {"lower", 2, SQLITE_UTF16, 0, icuCaseFunc16},
+ {"upper", 1, SQLITE_UTF16, (void*)1, icuCaseFunc16},
+ {"upper", 2, SQLITE_UTF16, (void*)1, icuCaseFunc16},
+
+ {"lower", 1, SQLITE_UTF8, 0, icuCaseFunc16},
+ {"lower", 2, SQLITE_UTF8, 0, icuCaseFunc16},
+ {"upper", 1, SQLITE_UTF8, (void*)1, icuCaseFunc16},
+ {"upper", 2, SQLITE_UTF8, (void*)1, icuCaseFunc16},
+ };
+
+ for(ii=0; ii<(sizeof(scalars)/sizeof(struct IcuScalar)); ii++){
+ struct IcuScalar *p = &scalars[ii];
+ rc = sqlite3_create_function(
+ db, p->zName, p->nArg, p->enc, p->pContext, p->xFunc, 0, 0
+ );
+ }
+
+ return SQLITE_OK;
+}
+
+#if !SQLITE_CORE
+int sqlite3_extension_init(
+ sqlite3 *db,
+ char **pzErrMsg,
+ const sqlite3_api_routines *pApi
+){
+ SQLITE_EXTENSION_INIT2(pApi)
+ return sqlite3IcuInit(db);
+}
+#endif
+
+#endif
-C Add\s"Powered\sBy\sSQLite"\slogo\scontributed\sby\sAlberto\sSimoes.\s(CVS\s3930)
-D 2007-05-05T22:45:01
+C Add\sthe\sstart\sof\sthe\sICU\sextension.\s(CVS\s3931)
+D 2007-05-06T16:04:12
F Makefile.in ea8888bdcf53313d26576fcabcb6d0a10ecd35cd
F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
F ext/fts2/fts2_tokenizer.h 4c5ffe31d63622869eb6eec1503df7f6996fd1bd
F ext/fts2/fts2_tokenizer1.c 5c979fe8815f95396beb22b627571da895a025af
F ext/fts2/mkfts2amal.tcl 2a9ec76b0760fe7f3669dca5bc0d60728bc1c977
+F ext/icu/icu.c 17ad2387c27133b5fcf7037687d5ff346f4a1da7
F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895
F ltmain.sh 56abb507100ed2d4261f6dd1653dec3cf4066387
-F main.mk a7522a769f2fe70c9bebd6bd8a36bed79be0e5cb
+F main.mk 6298bd3fcbc590fe05354f7d962c57ac202d7bcd
F mkdll.sh ed62756baf44babf562a7843588790c02fee2106
F mkopcodec.awk bd46ad001c98dfbab07b1713cb8e692fa0e5415d
F mkopcodeh.awk cde995d269aa06c94adbf6455bea0acedb913fa5
F src/insert.c e595ca26805dfb3a9ebaabc28e7947c479f3b14d
F src/legacy.c 388c71ad7fbcd898ba1bcbfc98a3ac954bfa5d01
F src/loadext.c afe4f4755dc49c36ef505748bbdddecb9f1d02a2
-F src/main.c e6eb036c3580ba9116fedfe4a8b58ed63d5abb37
+F src/main.c 2e11ec21dd11008a339b1d6d61aeb9b51992b2cf
F src/malloc.c b89e31258a85158d15795bf87ae3ba007e56329b
F src/md5.c c5fdfa5c2593eaee2e32a5ce6c6927c986eaf217
F src/os.c 4650e98aadd27abfe1698ff58edf6893c58d4881
F src/sqliteInt.h 3ffe2f9c801575e315451e7d2831c4a90a165aa8
F src/table.c a8de75bcedf84d4060d804264b067ab3b1a3561d
F src/tclsqlite.c f3414b2d6bc37e6760b49c9abd3504ff69f4441b
-F src/test1.c 515a91ed7ee95a6fa5b40873aa4f5aa9c858080e
+F src/test1.c 17e8402b4b567317b4e49923658d1f5874eaee5f
F src/test2.c 24458b17ab2f3c90cbc1c8446bd7ffe69be62f88
F src/test3.c 946ea9d1a8c928656e3c70f0a2fcb8e733a15e86
F src/test4.c 8b784cd82de158a2317cb4ac4bc86f91ad315e25
F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
-P bece7a6bae3a52da03c25b577e15a648eb91805a
-R e9cef941050626d3869bdb65d6d0f240
-U drh
-Z 860115faaebbc6372d09fd94f2e033c9
+P 25cfa7740a0899511d9200d99c2617c45ff00f32
+R 404e1ba474e37ae2a0e69793ca2f91cc
+U danielk1977
+Z 18a7c2474aed82907ffca52bb141507e
projects / thirdparty / sqlite.git / commitdiff
