std::set<ValueKey> JsonDb::Transaction::Walk()
{
std::set<ValueKey> keys;
// initialize the iterator
if(!vlcurfirst(db.get()))
throw std::runtime_error("Failed to initialize database iterator");
CharPtr key;
while((key = CharPtr(vlcurkey(db.get(), NULL))) != NULL)
{
keys.insert(*(ValueKey const *)key.get());
vlcurnext(db.get());
}
return keys;
}
ValuePointer JsonDb::Transaction::Retrieve(ValueKey key)
{
if(key == null_key)
return null_element;
// std::cout << "Retrieve: key=" << key << std::endl;
// Then retrieve the actual data
int value_size;
CharPtr val = CharPtr(vlget(db.get(), (char const *)&key, sizeof(ValueKey), &value_size));
if(val.get() == NULL)
return ValuePointer();
if(value_size <= 0)
throw std::runtime_error((boost::format("Element has an invalid size: %d") % key).str().c_str());
std::string val_str(val.get(), value_size);
std::istringstream input(val_str);
ValuePointer result = Value::Unserialize(key, input);
return result;
}
JSONParserBase::Token
JSONParser<CharT>::readNumber()
{
MOZ_ASSERT(current < end);
MOZ_ASSERT(JS7_ISDEC(*current) || *current == '-');
/*
* JSONNumber:
* /^-?(0|[1-9][0-9]+)(\.[0-9]+)?([eE][\+\-]?[0-9]+)?$/
*/
bool negative = *current == '-';
/* -? */
if (negative && ++current == end) {
error("no number after minus sign");
return token(Error);
}
const CharPtr digitStart = current;
/* 0|[1-9][0-9]+ */
if (!JS7_ISDEC(*current)) {
error("unexpected non-digit");
return token(Error);
}
if (*current++ != '0') {
for (; current < end; current++) {
if (!JS7_ISDEC(*current))
break;
}
}
/* Fast path: no fractional or exponent part. */
if (current == end || (*current != '.' && *current != 'e' && *current != 'E')) {
mozilla::Range<const CharT> chars(digitStart.get(), current - digitStart);
if (chars.length() < strlen("9007199254740992")) {
// If the decimal number is shorter than the length of 2**53, (the
// largest number a double can represent with integral precision),
// parse it using a decimal-only parser. This comparison is
// conservative but faster than a fully-precise check.
double d = ParseDecimalNumber(chars);
return numberToken(negative ? -d : d);
}
double d;
const CharT* dummy;
if (!GetPrefixInteger(cx, digitStart.get(), current.get(), 10, &dummy, &d))
return token(OOM);
MOZ_ASSERT(current == dummy);
return numberToken(negative ? -d : d);
}
/* (\.[0-9]+)? */
if (current < end && *current == '.') {
if (++current == end) {
error("missing digits after decimal point");
return token(Error);
}
if (!JS7_ISDEC(*current)) {
error("unterminated fractional number");
return token(Error);
}
while (++current < end) {
if (!JS7_ISDEC(*current))
break;
}
}
/* ([eE][\+\-]?[0-9]+)? */
if (current < end && (*current == 'e' || *current == 'E')) {
if (++current == end) {
error("missing digits after exponent indicator");
return token(Error);
}
if (*current == '+' || *current == '-') {
if (++current == end) {
error("missing digits after exponent sign");
return token(Error);
}
}
if (!JS7_ISDEC(*current)) {
error("exponent part is missing a number");
return token(Error);
}
while (++current < end) {
if (!JS7_ISDEC(*current))
break;
}
}
double d;
const CharT* finish;
if (!js_strtod(cx, digitStart.get(), current.get(), &finish, &d))
return token(OOM);
MOZ_ASSERT(current == finish);
return numberToken(negative ? -d : d);
}
JSONParserBase::Token
JSONParser<CharT>::readString()
{
MOZ_ASSERT(current < end);
MOZ_ASSERT(*current == '"');
/*
* JSONString:
* /^"([^\u0000-\u001F"\\]|\\(["/\\bfnrt]|u[0-9a-fA-F]{4}))*"$/
*/
if (++current == end) {
error("unterminated string literal");
return token(Error);
}
/*
* Optimization: if the source contains no escaped characters, create the
* string directly from the source text.
*/
CharPtr start = current;
for (; current < end; current++) {
if (*current == '"') {
size_t length = current - start;
current++;
JSFlatString* str = (ST == JSONParser::PropertyName)
? AtomizeChars(cx, start.get(), length)
: NewStringCopyN<CanGC>(cx, start.get(), length);
if (!str)
return token(OOM);
return stringToken(str);
}
if (*current == '\\')
break;
if (*current <= 0x001F) {
error("bad control character in string literal");
return token(Error);
}
}
/*
* Slow case: string contains escaped characters. Copy a maximal sequence
* of unescaped characters into a temporary buffer, then an escaped
* character, and repeat until the entire string is consumed.
*/
StringBuffer buffer(cx);
do {
if (start < current && !buffer.append(start.get(), current.get()))
return token(OOM);
if (current >= end)
break;
char16_t c = *current++;
if (c == '"') {
JSFlatString* str = (ST == JSONParser::PropertyName)
? buffer.finishAtom()
: buffer.finishString();
if (!str)
return token(OOM);
return stringToken(str);
}
if (c != '\\') {
--current;
error("bad character in string literal");
return token(Error);
}
if (current >= end)
break;
switch (*current++) {
case '"': c = '"'; break;
case '/': c = '/'; break;
case '\\': c = '\\'; break;
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'u':
if (end - current < 4 ||
!(JS7_ISHEX(current[0]) &&
JS7_ISHEX(current[1]) &&
JS7_ISHEX(current[2]) &&
JS7_ISHEX(current[3])))
{
// Point to the first non-hexadecimal character (which may be
// missing).
if (current == end || !JS7_ISHEX(current[0]))
; // already at correct location
else if (current + 1 == end || !JS7_ISHEX(current[1]))
current += 1;
else if (current + 2 == end || !JS7_ISHEX(current[2]))
current += 2;
else if (current + 3 == end || !JS7_ISHEX(current[3]))
current += 3;
else
MOZ_CRASH("logic error determining first erroneous character");
error("bad Unicode escape");
return token(Error);
}
c = (JS7_UNHEX(current[0]) << 12)
| (JS7_UNHEX(current[1]) << 8)
| (JS7_UNHEX(current[2]) << 4)
| (JS7_UNHEX(current[3]));
current += 4;
break;
default:
current--;
error("bad escaped character");
return token(Error);
}
if (!buffer.append(c))
return token(OOM);
start = current;
for (; current < end; current++) {
if (*current == '"' || *current == '\\' || *current <= 0x001F)
break;
}
} while (current < end);
error("unterminated string");
return token(Error);
}