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gecko-dev/toolkit/components/places/SQLFunctions.cpp

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/* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/storage.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsWhitespaceTokenizer.h"
#include "nsEscape.h"
#include "mozIPlacesAutoComplete.h"
#include "SQLFunctions.h"
#include "nsMathUtils.h"
#include "nsUTF8Utils.h"
#include "nsINavHistoryService.h"
#include "nsPrintfCString.h"
#include "nsNavHistory.h"
#if defined(XP_OS2)
#include "nsIRandomGenerator.h"
#endif
#include "mozilla/Telemetry.h"
#include "mozilla/Likely.h"
using namespace mozilla::storage;
// Keep the GUID-related parts of this file in sync with toolkit/downloads/SQLFunctions.cpp!
////////////////////////////////////////////////////////////////////////////////
//// Anonymous Helpers
namespace {
typedef nsACString::const_char_iterator const_char_iterator;
/**
* Get a pointer to the word boundary after aStart if aStart points to an
* ASCII letter (i.e. [a-zA-Z]). Otherwise, return aNext, which we assume
* points to the next character in the UTF-8 sequence.
*
* We define a word boundary as anything that's not [a-z] -- this lets us
* match CamelCase words.
*
* @param aStart the beginning of the UTF-8 sequence
* @param aNext the next character in the sequence
* @param aEnd the first byte which is not part of the sequence
*
* @return a pointer to the next word boundary after aStart
*/
static
MOZ_ALWAYS_INLINE const_char_iterator
nextWordBoundary(const_char_iterator const aStart,
const_char_iterator const aNext,
const_char_iterator const aEnd) {
const_char_iterator cur = aStart;
if (('a' <= *cur && *cur <= 'z') ||
('A' <= *cur && *cur <= 'Z')) {
// Since we'll halt as soon as we see a non-ASCII letter, we can do a
// simple byte-by-byte comparison here and avoid the overhead of a
// UTF8CharEnumerator.
do {
cur++;
} while (cur < aEnd && 'a' <= *cur && *cur <= 'z');
}
else {
cur = aNext;
}
return cur;
}
enum FindInStringBehavior {
eFindOnBoundary,
eFindAnywhere
};
/**
* findAnywhere and findOnBoundary do almost the same thing, so it's natural
* to implement them in terms of a single function. They're both
* performance-critical functions, however, and checking aBehavior makes them
* a bit slower. Our solution is to define findInString as MOZ_ALWAYS_INLINE
* and rely on the compiler to optimize out the aBehavior check.
*
* @param aToken
* The token we're searching for
* @param aSourceString
* The string in which we're searching
* @param aBehavior
* eFindOnBoundary if we should only consider matchines which occur on
* word boundaries, or eFindAnywhere if we should consider matches
* which appear anywhere.
*
* @return true if aToken was found in aSourceString, false otherwise.
*/
static
MOZ_ALWAYS_INLINE bool
findInString(const nsDependentCSubstring &aToken,
const nsACString &aSourceString,
FindInStringBehavior aBehavior)
{
// CaseInsensitiveUTF8CharsEqual assumes that there's at least one byte in
// the both strings, so don't pass an empty token here.
NS_PRECONDITION(!aToken.IsEmpty(), "Don't search for an empty token!");
// We cannot match anything if there is nothing to search.
if (aSourceString.IsEmpty()) {
return false;
}
const_char_iterator tokenStart(aToken.BeginReading()),
tokenEnd(aToken.EndReading()),
sourceStart(aSourceString.BeginReading()),
sourceEnd(aSourceString.EndReading());
do {
// We are on a word boundary (if aBehavior == eFindOnBoundary). See if
// aToken matches sourceStart.
// Check whether the first character in the token matches the character
// at sourceStart. At the same time, get a pointer to the next character
// in both the token and the source.
const_char_iterator sourceNext, tokenCur;
bool error;
if (CaseInsensitiveUTF8CharsEqual(sourceStart, tokenStart,
sourceEnd, tokenEnd,
&sourceNext, &tokenCur, &error)) {
// We don't need to check |error| here -- if
// CaseInsensitiveUTF8CharCompare encounters an error, it'll also
// return false and we'll catch the error outside the if.
const_char_iterator sourceCur = sourceNext;
while (true) {
if (tokenCur >= tokenEnd) {
// We matched the whole token!
return true;
}
if (sourceCur >= sourceEnd) {
// We ran into the end of source while matching a token. This
// means we'll never find the token we're looking for.
return false;
}
if (!CaseInsensitiveUTF8CharsEqual(sourceCur, tokenCur,
sourceEnd, tokenEnd,
&sourceCur, &tokenCur, &error)) {
// sourceCur doesn't match tokenCur (or there's an error), so break
// out of this loop.
break;
}
}
}
// If something went wrong above, get out of here!
if (MOZ_UNLIKELY(error)) {
return false;
}
// We didn't match the token. If we're searching for matches on word
// boundaries, skip to the next word boundary. Otherwise, advance
// forward one character, using the sourceNext pointer we saved earlier.
if (aBehavior == eFindOnBoundary) {
sourceStart = nextWordBoundary(sourceStart, sourceNext, sourceEnd);
}
else {
sourceStart = sourceNext;
}
} while (sourceStart < sourceEnd);
return false;
}
} // End anonymous namespace
namespace mozilla {
namespace places {
////////////////////////////////////////////////////////////////////////////////
//// AutoComplete Matching Function
//////////////////////////////////////////////////////////////////////////////
//// MatchAutoCompleteFunction
/* static */
nsresult
MatchAutoCompleteFunction::create(mozIStorageConnection *aDBConn)
{
nsRefPtr<MatchAutoCompleteFunction> function =
new MatchAutoCompleteFunction();
nsresult rv = aDBConn->CreateFunction(
NS_LITERAL_CSTRING("autocomplete_match"), kArgIndexLength, function
);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
/* static */
void
MatchAutoCompleteFunction::fixupURISpec(const nsCString &aURISpec,
int32_t aMatchBehavior,
nsCString &_fixedSpec)
{
nsCString unescapedSpec;
(void)NS_UnescapeURL(aURISpec, esc_SkipControl | esc_AlwaysCopy,
unescapedSpec);
// If this unescaped string is valid UTF-8, we'll use it. Otherwise,
// we will simply use our original string.
NS_ASSERTION(_fixedSpec.IsEmpty(),
"Passing a non-empty string as an out parameter!");
if (IsUTF8(unescapedSpec))
_fixedSpec.Assign(unescapedSpec);
else
_fixedSpec.Assign(aURISpec);
if (aMatchBehavior == mozIPlacesAutoComplete::MATCH_ANYWHERE_UNMODIFIED)
return;
if (StringBeginsWith(_fixedSpec, NS_LITERAL_CSTRING("http://")))
_fixedSpec.Cut(0, 7);
else if (StringBeginsWith(_fixedSpec, NS_LITERAL_CSTRING("https://")))
_fixedSpec.Cut(0, 8);
else if (StringBeginsWith(_fixedSpec, NS_LITERAL_CSTRING("ftp://")))
_fixedSpec.Cut(0, 6);
if (StringBeginsWith(_fixedSpec, NS_LITERAL_CSTRING("www.")))
_fixedSpec.Cut(0, 4);
}
/* static */
bool
MatchAutoCompleteFunction::findAnywhere(const nsDependentCSubstring &aToken,
const nsACString &aSourceString)
{
// We can't use FindInReadable here; it works only for ASCII.
return findInString(aToken, aSourceString, eFindAnywhere);
}
/* static */
bool
MatchAutoCompleteFunction::findOnBoundary(const nsDependentCSubstring &aToken,
const nsACString &aSourceString)
{
return findInString(aToken, aSourceString, eFindOnBoundary);
}
/* static */
bool
MatchAutoCompleteFunction::findBeginning(const nsDependentCSubstring &aToken,
const nsACString &aSourceString)
{
NS_PRECONDITION(!aToken.IsEmpty(), "Don't search for an empty token!");
// We can't use StringBeginsWith here, unfortunately. Although it will
// happily take a case-insensitive UTF8 comparator, it eventually calls
// nsACString::Equals, which checks that the two strings contain the same
// number of bytes before calling the comparator. Two characters may be
// case-insensitively equal while taking up different numbers of bytes, so
// this is not what we want.
const_char_iterator tokenStart(aToken.BeginReading()),
tokenEnd(aToken.EndReading()),
sourceStart(aSourceString.BeginReading()),
sourceEnd(aSourceString.EndReading());
bool dummy;
while (sourceStart < sourceEnd &&
CaseInsensitiveUTF8CharsEqual(sourceStart, tokenStart,
sourceEnd, tokenEnd,
&sourceStart, &tokenStart, &dummy)) {
// We found the token!
if (tokenStart >= tokenEnd) {
return true;
}
}
// We don't need to check CaseInsensitiveUTF8CharsEqual's error condition
// (stored in |dummy|), since the function will return false if it
// encounters an error.
return false;
}
/* static */
bool
MatchAutoCompleteFunction::findBeginningCaseSensitive(
const nsDependentCSubstring &aToken,
const nsACString &aSourceString)
{
NS_PRECONDITION(!aToken.IsEmpty(), "Don't search for an empty token!");
return StringBeginsWith(aSourceString, aToken);
}
/* static */
MatchAutoCompleteFunction::searchFunctionPtr
MatchAutoCompleteFunction::getSearchFunction(int32_t aBehavior)
{
switch (aBehavior) {
case mozIPlacesAutoComplete::MATCH_ANYWHERE:
case mozIPlacesAutoComplete::MATCH_ANYWHERE_UNMODIFIED:
return findAnywhere;
case mozIPlacesAutoComplete::MATCH_BEGINNING:
return findBeginning;
case mozIPlacesAutoComplete::MATCH_BEGINNING_CASE_SENSITIVE:
return findBeginningCaseSensitive;
case mozIPlacesAutoComplete::MATCH_BOUNDARY:
default:
return findOnBoundary;
};
}
NS_IMPL_THREADSAFE_ISUPPORTS1(
MatchAutoCompleteFunction,
mozIStorageFunction
)
//////////////////////////////////////////////////////////////////////////////
//// mozIStorageFunction
NS_IMETHODIMP
MatchAutoCompleteFunction::OnFunctionCall(mozIStorageValueArray *aArguments,
nsIVariant **_result)
{
// Macro to make the code a bit cleaner and easier to read. Operates on
// searchBehavior.
int32_t searchBehavior = aArguments->AsInt32(kArgIndexSearchBehavior);
#define HAS_BEHAVIOR(aBitName) \
(searchBehavior & mozIPlacesAutoComplete::BEHAVIOR_##aBitName)
nsAutoCString searchString;
(void)aArguments->GetUTF8String(kArgSearchString, searchString);
nsCString url;
(void)aArguments->GetUTF8String(kArgIndexURL, url);
int32_t matchBehavior = aArguments->AsInt32(kArgIndexMatchBehavior);
// We only want to filter javascript: URLs if we are not supposed to search
// for them, and the search does not start with "javascript:".
if (matchBehavior != mozIPlacesAutoComplete::MATCH_ANYWHERE_UNMODIFIED &&
!HAS_BEHAVIOR(JAVASCRIPT) &&
!StringBeginsWith(searchString, NS_LITERAL_CSTRING("javascript:")) &&
StringBeginsWith(url, NS_LITERAL_CSTRING("javascript:"))) {
NS_ADDREF(*_result = new IntegerVariant(0));
return NS_OK;
}
int32_t visitCount = aArguments->AsInt32(kArgIndexVisitCount);
bool typed = aArguments->AsInt32(kArgIndexTyped) ? true : false;
bool bookmark = aArguments->AsInt32(kArgIndexBookmark) ? true : false;
nsAutoCString tags;
(void)aArguments->GetUTF8String(kArgIndexTags, tags);
int32_t openPageCount = aArguments->AsInt32(kArgIndexOpenPageCount);
// Make sure we match all the filter requirements. If a given restriction
// is active, make sure the corresponding condition is not true.
bool matches = !(
(HAS_BEHAVIOR(HISTORY) && visitCount == 0) ||
(HAS_BEHAVIOR(TYPED) && !typed) ||
(HAS_BEHAVIOR(BOOKMARK) && !bookmark) ||
(HAS_BEHAVIOR(TAG) && tags.IsVoid()) ||
(HAS_BEHAVIOR(OPENPAGE) && openPageCount == 0)
);
if (!matches) {
NS_ADDREF(*_result = new IntegerVariant(0));
return NS_OK;
}
// Obtain our search function.
searchFunctionPtr searchFunction = getSearchFunction(matchBehavior);
// Clean up our URI spec and prepare it for searching.
nsCString fixedURI;
fixupURISpec(url, matchBehavior, fixedURI);
nsAutoCString title;
(void)aArguments->GetUTF8String(kArgIndexTitle, title);
// Determine if every token matches either the bookmark title, tags, page
// title, or page URL.
nsCWhitespaceTokenizer tokenizer(searchString);
while (matches && tokenizer.hasMoreTokens()) {
const nsDependentCSubstring &token = tokenizer.nextToken();
if (HAS_BEHAVIOR(TITLE) && HAS_BEHAVIOR(URL)) {
matches = (searchFunction(token, title) || searchFunction(token, tags)) &&
searchFunction(token, fixedURI);
}
else if (HAS_BEHAVIOR(TITLE)) {
matches = searchFunction(token, title) || searchFunction(token, tags);
}
else if (HAS_BEHAVIOR(URL)) {
matches = searchFunction(token, fixedURI);
}
else {
matches = searchFunction(token, title) ||
searchFunction(token, tags) ||
searchFunction(token, fixedURI);
}
}
NS_ADDREF(*_result = new IntegerVariant(matches ? 1 : 0));
return NS_OK;
#undef HAS_BEHAVIOR
}
////////////////////////////////////////////////////////////////////////////////
//// Frecency Calculation Function
//////////////////////////////////////////////////////////////////////////////
//// CalculateFrecencyFunction
/* static */
nsresult
CalculateFrecencyFunction::create(mozIStorageConnection *aDBConn)
{
nsRefPtr<CalculateFrecencyFunction> function =
new CalculateFrecencyFunction();
nsresult rv = aDBConn->CreateFunction(
NS_LITERAL_CSTRING("calculate_frecency"), 1, function
);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMPL_THREADSAFE_ISUPPORTS1(
CalculateFrecencyFunction,
mozIStorageFunction
)
//////////////////////////////////////////////////////////////////////////////
//// mozIStorageFunction
NS_IMETHODIMP
CalculateFrecencyFunction::OnFunctionCall(mozIStorageValueArray *aArguments,
nsIVariant **_result)
{
// Fetch arguments. Use default values if they were omitted.
uint32_t numEntries;
nsresult rv = aArguments->GetNumEntries(&numEntries);
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(numEntries > 0, "unexpected number of arguments");
Telemetry::AutoTimer<Telemetry::PLACES_FRECENCY_CALC_TIME_MS> timer;
int64_t pageId = aArguments->AsInt64(0);
int32_t typed = numEntries > 1 ? aArguments->AsInt32(1) : 0;
int32_t fullVisitCount = numEntries > 2 ? aArguments->AsInt32(2) : 0;
int64_t bookmarkId = numEntries > 3 ? aArguments->AsInt64(3) : 0;
int32_t visitCount = 0;
int32_t hidden = 0;
int32_t isQuery = 0;
float pointsForSampledVisits = 0.0;
// This is a const version of the history object for thread-safety.
const nsNavHistory* history = nsNavHistory::GetConstHistoryService();
NS_ENSURE_STATE(history);
nsRefPtr<Database> DB = Database::GetDatabase();
NS_ENSURE_STATE(DB);
if (pageId > 0) {
// The page is already in the database, and we can fetch current
// params from the database.
nsRefPtr<mozIStorageStatement> getPageInfo = DB->GetStatement(
"SELECT typed, hidden, visit_count, "
"(SELECT count(*) FROM moz_historyvisits WHERE place_id = :page_id), "
"EXISTS (SELECT 1 FROM moz_bookmarks WHERE fk = :page_id), "
"(url > 'place:' AND url < 'place;') "
"FROM moz_places "
"WHERE id = :page_id "
);
NS_ENSURE_STATE(getPageInfo);
mozStorageStatementScoper infoScoper(getPageInfo);
rv = getPageInfo->BindInt64ByName(NS_LITERAL_CSTRING("page_id"), pageId);
NS_ENSURE_SUCCESS(rv, rv);
bool hasResult;
rv = getPageInfo->ExecuteStep(&hasResult);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(hasResult, NS_ERROR_UNEXPECTED);
rv = getPageInfo->GetInt32(0, &typed);
NS_ENSURE_SUCCESS(rv, rv);
rv = getPageInfo->GetInt32(1, &hidden);
NS_ENSURE_SUCCESS(rv, rv);
rv = getPageInfo->GetInt32(2, &visitCount);
NS_ENSURE_SUCCESS(rv, rv);
rv = getPageInfo->GetInt32(3, &fullVisitCount);
NS_ENSURE_SUCCESS(rv, rv);
rv = getPageInfo->GetInt64(4, &bookmarkId);
NS_ENSURE_SUCCESS(rv, rv);
rv = getPageInfo->GetInt32(5, &isQuery);
NS_ENSURE_SUCCESS(rv, rv);
// NOTE: This is not limited to visits with "visit_type NOT IN (0,4,7,8)"
// because otherwise it would not return any visit for those transitions
// causing an incorrect frecency, see CalculateFrecencyInternal().
// In case of a temporary or permanent redirect, calculate the frecency
// as if the original page was visited.
// Get a sample of the last visits to the page, to calculate its weight.
nsCOMPtr<mozIStorageStatement> getVisits = DB->GetStatement(
NS_LITERAL_CSTRING(
"/* do not warn (bug 659740 - SQLite may ignore index if few visits exist) */"
"SELECT "
"ROUND((strftime('%s','now','localtime','utc') - v.visit_date/1000000)/86400), "
"IFNULL(r.visit_type, v.visit_type), "
"v.visit_date "
"FROM moz_historyvisits v "
"LEFT JOIN moz_historyvisits r ON r.id = v.from_visit AND v.visit_type BETWEEN "
) + nsPrintfCString("%d AND %d ", nsINavHistoryService::TRANSITION_REDIRECT_PERMANENT,
nsINavHistoryService::TRANSITION_REDIRECT_TEMPORARY) +
NS_LITERAL_CSTRING(
"WHERE v.place_id = :page_id "
"ORDER BY v.visit_date DESC "
)
);
NS_ENSURE_STATE(getVisits);
mozStorageStatementScoper visitsScoper(getVisits);
rv = getVisits->BindInt64ByName(NS_LITERAL_CSTRING("page_id"), pageId);
NS_ENSURE_SUCCESS(rv, rv);
// Fetch only a limited number of recent visits.
int32_t numSampledVisits = 0;
for (int32_t maxVisits = history->GetNumVisitsForFrecency();
numSampledVisits < maxVisits &&
NS_SUCCEEDED(getVisits->ExecuteStep(&hasResult)) && hasResult;
numSampledVisits++) {
int32_t visitType;
rv = getVisits->GetInt32(1, &visitType);
NS_ENSURE_SUCCESS(rv, rv);
int32_t bonus = history->GetFrecencyTransitionBonus(visitType, true);
// Always add the bookmark visit bonus.
if (bookmarkId) {
bonus += history->GetFrecencyTransitionBonus(nsINavHistoryService::TRANSITION_BOOKMARK, true);
}
// If bonus was zero, we can skip the work to determine the weight.
if (bonus) {
int32_t ageInDays = getVisits->AsInt32(0);
int32_t weight = history->GetFrecencyAgedWeight(ageInDays);
pointsForSampledVisits += (float)(weight * (bonus / 100.0));
}
}
// If we found some visits for this page, use the calculated weight.
if (numSampledVisits) {
// fix for bug #412219
if (!pointsForSampledVisits) {
// For URIs with zero points in the sampled recent visits
// but "browsing" type visits outside the sampling range, set
// frecency to -visit_count, so they're still shown in autocomplete.
NS_ADDREF(*_result = new IntegerVariant(-visitCount));
}
else {
// Estimate frecency using the last few visits.
// Use ceilf() so that we don't round down to 0, which
// would cause us to completely ignore the place during autocomplete.
NS_ADDREF(*_result = new IntegerVariant((int32_t) ceilf(fullVisitCount * ceilf(pointsForSampledVisits) / numSampledVisits)));
}
return NS_OK;
}
}
// This page is unknown or has no visits. It could have just been added, so
// use passed in or default values.
// The code below works well for guessing the frecency on import, and we'll
// correct later once we have visits.
// TODO: What if we don't have visits and we never visit? We could end up
// with a really high value that keeps coming up in ac results? Should we
// only do this on import? Have to figure it out.
int32_t bonus = 0;
// Make it so something bookmarked and typed will have a higher frecency
// than something just typed or just bookmarked.
if (bookmarkId && !isQuery) {
bonus += history->GetFrecencyTransitionBonus(nsINavHistoryService::TRANSITION_BOOKMARK, false);;
// For unvisited bookmarks, produce a non-zero frecency, so that they show
// up in URL bar autocomplete.
fullVisitCount = 1;
}
if (typed) {
bonus += history->GetFrecencyTransitionBonus(nsINavHistoryService::TRANSITION_TYPED, false);
}
// Assume "now" as our ageInDays, so use the first bucket.
pointsForSampledVisits = history->GetFrecencyBucketWeight(1) * (bonus / (float)100.0);
// use ceilf() so that we don't round down to 0, which
// would cause us to completely ignore the place during autocomplete
NS_ADDREF(*_result = new IntegerVariant((int32_t) ceilf(fullVisitCount * ceilf(pointsForSampledVisits))));
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
//// GUID Creation Function
//////////////////////////////////////////////////////////////////////////////
//// GenerateGUIDFunction
/* static */
nsresult
GenerateGUIDFunction::create(mozIStorageConnection *aDBConn)
{
#if defined(XP_OS2)
// We need this service to be initialized on the main thread because it is
// not threadsafe. We are about to use it asynchronously, so initialize it
// now.
nsCOMPtr<nsIRandomGenerator> rg =
do_GetService("@mozilla.org/security/random-generator;1");
NS_ENSURE_STATE(rg);
#endif
nsRefPtr<GenerateGUIDFunction> function = new GenerateGUIDFunction();
nsresult rv = aDBConn->CreateFunction(
NS_LITERAL_CSTRING("generate_guid"), 0, function
);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMPL_THREADSAFE_ISUPPORTS1(
GenerateGUIDFunction,
mozIStorageFunction
)
//////////////////////////////////////////////////////////////////////////////
//// mozIStorageFunction
NS_IMETHODIMP
GenerateGUIDFunction::OnFunctionCall(mozIStorageValueArray *aArguments,
nsIVariant **_result)
{
nsAutoCString guid;
nsresult rv = GenerateGUID(guid);
NS_ENSURE_SUCCESS(rv, rv);
NS_ADDREF(*_result = new UTF8TextVariant(guid));
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
//// Get Unreversed Host Function
//////////////////////////////////////////////////////////////////////////////
//// GetUnreversedHostFunction
/* static */
nsresult
GetUnreversedHostFunction::create(mozIStorageConnection *aDBConn)
{
nsRefPtr<GetUnreversedHostFunction> function = new GetUnreversedHostFunction();
nsresult rv = aDBConn->CreateFunction(
NS_LITERAL_CSTRING("get_unreversed_host"), 1, function
);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMPL_THREADSAFE_ISUPPORTS1(
GetUnreversedHostFunction,
mozIStorageFunction
)
//////////////////////////////////////////////////////////////////////////////
//// mozIStorageFunction
NS_IMETHODIMP
GetUnreversedHostFunction::OnFunctionCall(mozIStorageValueArray *aArguments,
nsIVariant **_result)
{
// Must have non-null function arguments.
MOZ_ASSERT(aArguments);
nsAutoString src;
aArguments->GetString(0, src);
nsCOMPtr<nsIWritableVariant> result =
do_CreateInstance("@mozilla.org/variant;1");
NS_ENSURE_STATE(result);
if (src.Length()>1) {
src.Truncate(src.Length() - 1);
nsAutoString dest;
ReverseString(src, dest);
result->SetAsAString(dest);
}
else {
result->SetAsAString(EmptyString());
}
NS_ADDREF(*_result = result);
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
//// Fixup URL Function
//////////////////////////////////////////////////////////////////////////////
//// FixupURLFunction
/* static */
nsresult
FixupURLFunction::create(mozIStorageConnection *aDBConn)
{
nsRefPtr<FixupURLFunction> function = new FixupURLFunction();
nsresult rv = aDBConn->CreateFunction(
NS_LITERAL_CSTRING("fixup_url"), 1, function
);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMPL_THREADSAFE_ISUPPORTS1(
FixupURLFunction,
mozIStorageFunction
)
//////////////////////////////////////////////////////////////////////////////
//// mozIStorageFunction
NS_IMETHODIMP
FixupURLFunction::OnFunctionCall(mozIStorageValueArray *aArguments,
nsIVariant **_result)
{
// Must have non-null function arguments.
MOZ_ASSERT(aArguments);
nsAutoString src;
aArguments->GetString(0, src);
nsCOMPtr<nsIWritableVariant> result =
do_CreateInstance("@mozilla.org/variant;1");
NS_ENSURE_STATE(result);
// Remove common URL hostname prefixes
if (StringBeginsWith(src, NS_LITERAL_STRING("www."))) {
src.Cut(0, 4);
}
result->SetAsAString(src);
NS_ADDREF(*_result = result);
return NS_OK;
}
} // namespace places
} // namespace mozilla
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