void exactNumericToStr(SINT64 value, int scale, Firebird::string& target, bool append)
{
if (value == 0)
{
if (append)
target.append("0", 1);
else
target.assign("0", 1);
return;
}
const int MAX_SCALE = 25;
const int MAX_BUFFER = 50;
if (scale < -MAX_SCALE || scale > MAX_SCALE)
{
fb_assert(false);
return; // throw exception here?
}
const bool neg = value < 0;
const bool dot = scale < 0; // Need the decimal separator or not?
char buffer[MAX_BUFFER];
int iter = MAX_BUFFER;
buffer[--iter] = '\0';
if (scale > 0)
{
while (scale-- > 0)
buffer[--iter] = '0';
}
bool dot_used = false;
FB_UINT64 uval = neg ? FB_UINT64(-(value + 1)) + 1 : value; // avoid problems with MIN_SINT64
while (uval != 0)
{
buffer[--iter] = static_cast<char>(uval % 10) + '0';
uval /= 10;
if (dot && !++scale)
{
buffer[--iter] = '.';
dot_used = true;
}
}
if (dot)
{
// if scale > 0 we have N.M
// if scale == 0 we have .M and we need 0.M
// if scale < 0 we have pending zeroes and need 0.{0+}M
if (!dot_used)
{
while (scale++ < 0)
buffer[--iter] = '0';
buffer[--iter] = '.';
buffer[--iter] = '0';
}
else if (!scale)
buffer[--iter] = '0';
}
if (neg)
buffer[--iter] = '-';
const FB_SIZE_T len = MAX_BUFFER - iter - 1;
if (append)
target.append(buffer + iter, len);
else
target.assign(buffer + iter, len);
}
int Parser::yylexAux()
{
thread_db* tdbb = JRD_get_thread_data();
MemoryPool& pool = *tdbb->getDefaultPool();
SSHORT c = lex.ptr[-1];
UCHAR tok_class = classes(c);
char string[MAX_TOKEN_LEN];
// Depending on tok_class of token, parse token
lex.last_token = lex.ptr - 1;
if (tok_class & CHR_INTRODUCER)
{
// The Introducer (_) is skipped, all other idents are copied
// to become the name of the character set.
char* p = string;
for (; lex.ptr < lex.end && classes(*lex.ptr) & CHR_IDENT; lex.ptr++)
{
if (lex.ptr >= lex.end)
return -1;
check_copy_incr(p, UPPER7(*lex.ptr), string);
}
check_bound(p, string);
if (p - string > MAX_SQL_IDENTIFIER_LEN)
yyabandon(-104, isc_dyn_name_longer);
*p = 0;
// make a string value to hold the name, the name is resolved in pass1_constant.
yylval.metaNamePtr = FB_NEW(pool) MetaName(pool, string, p - string);
return INTRODUCER;
}
// parse a quoted string, being sure to look for double quotes
if (tok_class & CHR_QUOTE)
{
StrMark mark;
mark.pos = lex.last_token - lex.start;
char* buffer = string;
size_t buffer_len = sizeof(string);
const char* buffer_end = buffer + buffer_len - 1;
char* p;
for (p = buffer; ; ++p)
{
if (lex.ptr >= lex.end)
{
if (buffer != string)
gds__free (buffer);
yyerror("unterminated string");
return -1;
}
// Care about multi-line constants and identifiers
if (*lex.ptr == '\n')
{
lex.lines++;
lex.line_start = lex.ptr + 1;
}
// *lex.ptr is quote - if next != quote we're at the end
if ((*lex.ptr == c) && ((++lex.ptr == lex.end) || (*lex.ptr != c)))
break;
if (p > buffer_end)
{
char* const new_buffer = (char*) gds__alloc (2 * buffer_len);
// FREE: at outer block
if (!new_buffer) // NOMEM:
{
if (buffer != string)
gds__free (buffer);
return -1;
}
memcpy (new_buffer, buffer, buffer_len);
if (buffer != string)
gds__free (buffer);
buffer = new_buffer;
p = buffer + buffer_len;
buffer_len = 2 * buffer_len;
buffer_end = buffer + buffer_len - 1;
}
*p = *lex.ptr++;
}
if (c == '"')
{
stmt_ambiguous = true;
// string delimited by double quotes could be
// either a string constant or a SQL delimited
// identifier, therefore marks the SQL statement as ambiguous
if (client_dialect == SQL_DIALECT_V6_TRANSITION)
{
if (buffer != string)
gds__free (buffer);
yyabandon (-104, isc_invalid_string_constant);
}
else if (client_dialect >= SQL_DIALECT_V6)
{
if (p - buffer >= MAX_TOKEN_LEN)
{
if (buffer != string)
gds__free (buffer);
yyabandon(-104, isc_token_too_long);
}
else if (p > &buffer[MAX_SQL_IDENTIFIER_LEN])
{
if (buffer != string)
gds__free (buffer);
yyabandon(-104, isc_dyn_name_longer);
}
else if (p - buffer == 0)
{
if (buffer != string)
gds__free (buffer);
yyabandon(-104, isc_dyn_zero_len_id);
}
Attachment* attachment = tdbb->getAttachment();
MetaName name(attachment->nameToMetaCharSet(tdbb, MetaName(buffer, p - buffer)));
yylval.metaNamePtr = FB_NEW(pool) MetaName(pool, name);
if (buffer != string)
gds__free (buffer);
return SYMBOL;
}
}
yylval.intlStringPtr = newIntlString(Firebird::string(buffer, p - buffer));
if (buffer != string)
gds__free (buffer);
mark.length = lex.ptr - lex.last_token;
mark.str = yylval.intlStringPtr;
strMarks.put(mark.str, mark);
return STRING;
}
/*
* Check for a numeric constant, which starts either with a digit or with
* a decimal point followed by a digit.
*
* This code recognizes the following token types:
*
* NUMBER: string of digits which fits into a 32-bit integer
*
* NUMBER64BIT: string of digits whose value might fit into an SINT64,
* depending on whether or not there is a preceding '-', which is to
* say that "9223372036854775808" is accepted here.
*
* SCALEDINT: string of digits and a single '.', where the digits
* represent a value which might fit into an SINT64, depending on
* whether or not there is a preceding '-'.
*
* FLOAT: string of digits with an optional '.', and followed by an "e"
* or "E" and an optionally-signed exponent.
*
* NOTE: we swallow leading or trailing blanks, but we do NOT accept
* embedded blanks:
*
* Another note: c is the first character which need to be considered,
* ptr points to the next character.
*/
fb_assert(lex.ptr <= lex.end);
// Hexadecimal string constant. This is treated the same as a
// string constant, but is defined as: X'bbbb'
//
// Where the X is a literal 'x' or 'X' character, followed
// by a set of nibble values in single quotes. The nibble
// can be 0-9, a-f, or A-F, and is converted from the hex.
// The number of nibbles should be even.
//
// The resulting value is stored in a string descriptor and
// returned to the parser as a string. This can be stored
// in a character or binary item.
if ((c == 'x' || c == 'X') && lex.ptr < lex.end && *lex.ptr == '\'')
{
bool hexerror = false;
// Remember where we start from, to rescan later.
// Also we'll need to know the length of the buffer.
const char* hexstring = ++lex.ptr;
int charlen = 0;
// Time to scan the string. Make sure the characters are legal,
// and find out how long the hex digit string is.
for (;;)
{
if (lex.ptr >= lex.end) // Unexpected EOS
{
hexerror = true;
break;
}
c = *lex.ptr;
if (c == '\'') // Trailing quote, done
{
++lex.ptr; // Skip the quote
break;
}
if (!(classes(c) & CHR_HEX)) // Illegal character
{
hexerror = true;
break;
}
++charlen; // Okay, just count 'em
++lex.ptr; // and advance...
}
hexerror = hexerror || (charlen & 1); // IS_ODD(charlen)
// If we made it this far with no error, then convert the string.
if (!hexerror)
{
// Figure out the length of the actual resulting hex string.
// Allocate a second temporary buffer for it.
Firebird::string temp;
// Re-scan over the hex string we got earlier, converting
// adjacent bytes into nibble values. Every other nibble,
// write the saved byte to the temp space. At the end of
// this, the temp.space area will contain the binary
// representation of the hex constant.
UCHAR byte = 0;
for (int i = 0; i < charlen; i++)
{
c = UPPER7(hexstring[i]);
// Now convert the character to a nibble
if (c >= 'A')
c = (c - 'A') + 10;
else
c = (c - '0');
if (i & 1) // nibble?
{
byte = (byte << 4) + (UCHAR) c;
temp.append(1, (char) byte);
}
else
byte = c;
}
yylval.intlStringPtr = newIntlString(temp, "BINARY");
return STRING;
} // if (!hexerror)...
// If we got here, there was a parsing error. Set the
// position back to where it was before we messed with
// it. Then fall through to the next thing we might parse.
c = *lex.last_token;
lex.ptr = lex.last_token + 1;
}
if ((c == 'q' || c == 'Q') && lex.ptr + 3 < lex.end && *lex.ptr == '\'')
{
StrMark mark;
mark.pos = lex.last_token - lex.start;
char endChar = *++lex.ptr;
switch (endChar)
{
case '{':
endChar = '}';
break;
case '(':
endChar = ')';
break;
case '[':
endChar = ']';
break;
case '<':
endChar = '>';
break;
}
while (++lex.ptr + 1 < lex.end)
{
if (*lex.ptr == endChar && *++lex.ptr == '\'')
{
yylval.intlStringPtr = newIntlString(
Firebird::string(lex.last_token + 3, lex.ptr - lex.last_token - 4));
++lex.ptr;
mark.length = lex.ptr - lex.last_token;
mark.str = yylval.intlStringPtr;
strMarks.put(mark.str, mark);
return STRING;
}
}
// If we got here, there was a parsing error. Set the
// position back to where it was before we messed with
// it. Then fall through to the next thing we might parse.
c = *lex.last_token;
lex.ptr = lex.last_token + 1;
}
// Hexadecimal numeric constants - 0xBBBBBB
//
// where the '0' and the 'X' (or 'x') are literal, followed
// by a set of nibbles, using 0-9, a-f, or A-F. Odd numbers
// of nibbles assume a leading '0'. The result is converted
// to an integer, and the result returned to the caller. The
// token is identified as a NUMBER if it's a 32-bit or less
// value, or a NUMBER64INT if it requires a 64-bit number.
if (c == '0' && lex.ptr + 1 < lex.end && (*lex.ptr == 'x' || *lex.ptr == 'X') &&
(classes(lex.ptr[1]) & CHR_HEX))
{
bool hexerror = false;
// Remember where we start from, to rescan later.
// Also we'll need to know the length of the buffer.
++lex.ptr; // Skip the 'X' and point to the first digit
const char* hexstring = lex.ptr;
int charlen = 0;
// Time to scan the string. Make sure the characters are legal,
// and find out how long the hex digit string is.
for (;;)
{
if (lex.ptr >= lex.end) // Unexpected EOS
{
hexerror = true;
break;
}
c = *lex.ptr;
if (!(classes(c) & CHR_HEX)) // End of digit string
break;
++charlen; // Okay, just count 'em
++lex.ptr; // and advance...
if (charlen > 16) // Too many digits...
{
hexerror = true;
break;
}
}
// we have a valid hex token. Now give it back, either as
// an NUMBER or NUMBER64BIT.
if (!hexerror)
{
// if charlen > 8 (something like FFFF FFFF 0, w/o the spaces)
// then we have to return a NUMBER64BIT. We'll make a string
// node here, and let make.cpp worry about converting the
// string to a number and building the node later.
if (charlen > 8)
{
char cbuff[32];
cbuff[0] = 'X';
strncpy(&cbuff[1], hexstring, charlen);
cbuff[charlen + 1] = '\0';
char* p = &cbuff[1];
while (*p != '\0')
{
if ((*p >= 'a') && (*p <= 'f'))
*p = UPPER(*p);
p++;
}
yylval.stringPtr = newString(cbuff);
return NUMBER64BIT;
}
else
{
// we have an integer value. we'll return NUMBER.
// but we have to make a number value to be compatible
// with existing code.
// See if the string length is odd. If so,
// we'll assume a leading zero. Then figure out the length
// of the actual resulting hex string. Allocate a second
// temporary buffer for it.
bool nibble = (charlen & 1); // IS_ODD(temp.length)
// Re-scan over the hex string we got earlier, converting
// adjacent bytes into nibble values. Every other nibble,
// write the saved byte to the temp space. At the end of
// this, the temp.space area will contain the binary
// representation of the hex constant.
UCHAR byte = 0;
SINT64 value = 0;
for (int i = 0; i < charlen; i++)
{
c = UPPER(hexstring[i]);
// Now convert the character to a nibble
if (c >= 'A')
c = (c - 'A') + 10;
else
c = (c - '0');
if (nibble)
{
byte = (byte << 4) + (UCHAR) c;
nibble = false;
value = (value << 8) + byte;
}
else
{
byte = c;
nibble = true;
}
}
yylval.int32Val = (SLONG) value;
return NUMBER;
} // integer value
} // if (!hexerror)...
// If we got here, there was a parsing error. Set the
// position back to where it was before we messed with
// it. Then fall through to the next thing we might parse.
c = *lex.last_token;
lex.ptr = lex.last_token + 1;
} // headecimal numeric constants
if ((tok_class & CHR_DIGIT) ||
((c == '.') && (lex.ptr < lex.end) && (classes(*lex.ptr) & CHR_DIGIT)))
{
// The following variables are used to recognize kinds of numbers.
bool have_error = false; // syntax error or value too large
bool have_digit = false; // we've seen a digit
bool have_decimal = false; // we've seen a '.'
bool have_exp = false; // digit ... [eE]
bool have_exp_sign = false; // digit ... [eE] {+-]
bool have_exp_digit = false; // digit ... [eE] ... digit
FB_UINT64 number = 0;
FB_UINT64 limit_by_10 = MAX_SINT64 / 10;
for (--lex.ptr; lex.ptr < lex.end; lex.ptr++)
{
c = *lex.ptr;
if (have_exp_digit && (! (classes(c) & CHR_DIGIT)))
// First non-digit after exponent and digit terminates the token.
break;
if (have_exp_sign && (! (classes(c) & CHR_DIGIT)))
{
// only digits can be accepted after "1E-"
have_error = true;
break;
}
if (have_exp)
{
// We've seen e or E, but nothing beyond that.
if ( ('-' == c) || ('+' == c) )
have_exp_sign = true;
else if ( classes(c) & CHR_DIGIT )
// We have a digit: we haven't seen a sign yet, but it's too late now.
have_exp_digit = have_exp_sign = true;
else
{
// end of the token
have_error = true;
break;
}
}
else if ('.' == c)
{
if (!have_decimal)
have_decimal = true;
else
{
have_error = true;
break;
}
}
else if (classes(c) & CHR_DIGIT)
{
// Before computing the next value, make sure there will be no overflow.
have_digit = true;
if (number >= limit_by_10)
{
// possibility of an overflow
if ((number > limit_by_10) || (c > '8'))
{
have_error = true;
break;
}
}
number = number * 10 + (c - '0');
}
else if ( (('E' == c) || ('e' == c)) && have_digit )
have_exp = true;
else
// Unexpected character: this is the end of the number.
break;
}
// We're done scanning the characters: now return the right kind
// of number token, if any fits the bill.
if (!have_error)
{
fb_assert(have_digit);
if (have_exp_digit)
{
yylval.stringPtr = newString(
Firebird::string(lex.last_token, lex.ptr - lex.last_token));
lex.last_token_bk = lex.last_token;
lex.line_start_bk = lex.line_start;
lex.lines_bk = lex.lines;
return FLOAT_NUMBER;
}
if (!have_exp)
{
// We should return some kind (scaled-) integer type
// except perhaps in dialect 1.
if (!have_decimal && (number <= MAX_SLONG))
{
yylval.int32Val = (SLONG) number;
//printf ("parse.y %p %d\n", yylval.legacyStr, number);
return NUMBER;
}
else
{
/* We have either a decimal point with no exponent
or a string of digits whose value exceeds MAX_SLONG:
the returned type depends on the client dialect,
so warn of the difference if the client dialect is
SQL_DIALECT_V6_TRANSITION.
*/
if (SQL_DIALECT_V6_TRANSITION == client_dialect)
{
/* Issue a warning about the ambiguity of the numeric
* numeric literal. There are multiple calls because
* the message text exceeds the 119-character limit
* of our message database.
*/
ERRD_post_warning(Arg::Warning(isc_dsql_warning_number_ambiguous) <<
Arg::Str(Firebird::string(lex.last_token, lex.ptr - lex.last_token)));
ERRD_post_warning(Arg::Warning(isc_dsql_warning_number_ambiguous1));
}
yylval.stringPtr = newString(Firebird::string(lex.last_token, lex.ptr - lex.last_token));
lex.last_token_bk = lex.last_token;
lex.line_start_bk = lex.line_start;
lex.lines_bk = lex.lines;
if (client_dialect < SQL_DIALECT_V6_TRANSITION)
return FLOAT_NUMBER;
if (have_decimal)
return SCALEDINT;
return NUMBER64BIT;
}
} // else if (!have_exp)
} // if (!have_error)
// we got some kind of error or overflow, so don't recognize this
// as a number: just pass it through to the next part of the lexer.
}
// Restore the status quo ante, before we started our unsuccessful
// attempt to recognize a number.
lex.ptr = lex.last_token;
c = *lex.ptr++;
// We never touched tok_class, so it doesn't need to be restored.
// end of number-recognition code
if (tok_class & CHR_LETTER)
{
char* p = string;
check_copy_incr(p, UPPER (c), string);
for (; lex.ptr < lex.end && classes(*lex.ptr) & CHR_IDENT; lex.ptr++)
{
if (lex.ptr >= lex.end)
return -1;
check_copy_incr(p, UPPER (*lex.ptr), string);
}
check_bound(p, string);
*p = 0;
if (p > &string[MAX_SQL_IDENTIFIER_LEN])
yyabandon(-104, isc_dyn_name_longer);
MetaName str(string, p - string);
KeywordVersion* keyVer = keywordsMap->get(str);
if (keyVer && parser_version >= keyVer->version &&
(keyVer->keyword != COMMENT || lex.prev_keyword == -1))
{
yylval.metaNamePtr = keyVer->str;
lex.last_token_bk = lex.last_token;
lex.line_start_bk = lex.line_start;
lex.lines_bk = lex.lines;
return keyVer->keyword;
}
yylval.metaNamePtr = FB_NEW(pool) MetaName(pool, str);
lex.last_token_bk = lex.last_token;
lex.line_start_bk = lex.line_start;
lex.lines_bk = lex.lines;
return SYMBOL;
}
// Must be punctuation -- test for double character punctuation
if (lex.last_token + 1 < lex.end && !isspace(UCHAR(lex.last_token[1])))
{
Firebird::string str(lex.last_token, 2);
KeywordVersion* keyVer = keywordsMap->get(str);
if (keyVer && keyVer && parser_version >= keyVer->version)
{
++lex.ptr;
return keyVer->keyword;
}
}
// Single character punctuation are simply passed on
return (UCHAR) c;
}
