int OctStrToInt64(const char *string, uint64_t *dest){
while(*string!='\0'){
if(!IsOctDigit(*string)) return -1;
dest[0]<<=3;
dest[0]+=(*string)-'0';
string++;
}
return 1;
}
static int ScanNumericLiteral()
{
int base = 10;
if('.' == *CURSOR)
{
return ScanFloatLiteral();
}
if('0' == *CURSOR && (CURSOR[1] == 'x'|| CURSOR[1] == 'X'))
{
base = 16;
CURSOR += 2;
while(IsHexDigit(*CURSOR))
{
CURSOR++;
}
}
else if('0' == *CURSOR)
{
base = 8;
CURSOR++;
while(IsOctDigit(*CURSOR))
{
CURSOR++;
}
}
else
{
CURSOR++;
while(IsDigit(*CURSOR))
{
CURSOR++;
}
}
if(base == 16 || (*CURSOR == '.' && *CURSOR == 'e' && *CURSOR == 'E'))
{
while('u' == *CURSOR || 'U' == *CURSOR ||
'l' == *CURSOR || 'L' == *CURSOR)
{
CURSOR++;
}
return TK_INTCONST;
}
else
{
return ScanFloatLiteral();
}
}
TokenType ReadOctNumber(istream& is, string& str, Coordinates& xy)
{
State st;
char c;
while (!is.eof())
{
st = GetState(is.peek());
if (IsSyntaxError(st))
throw Error("syntax error", pos.first, pos.second);
if (IsOctDigit(is.peek()))
str = str + GetSymb(is,xy);
else
{
c = GetSymb(is,xy);
if (!IsSep(c) && c != '\n' && c != EOF)
throw Error("wrong oct number", pos.first, pos.second);
return int_const_oct;
}
}
return int_const_hex;
}
static inline size_t EscapeC(unsigned char c, TNextChar next, TBufferChar r[ESCAPE_C_BUFFER_SIZE]) {
// (1) Printable characters go as-is, except backslash and double quote.
// (2) Characters \r, \n, \t and \0 ... \7 replaced by their simple escape characters (if possible).
// (3) Otherwise, character is encoded using hexadecimal escape sequence (if possible), or octal.
if (c == '\"') {
r[0] = '\\';
r[1] = '\"';
return 2;
} else if (c == '\\') {
r[0] = '\\';
r[1] = '\\';
return 2;
} else if (IsPrintable(c)) {
r[0] = c;
return 1;
} else if (c == '\r') {
r[0] = '\\';
r[1] = 'r';
return 2;
} else if (c == '\n') {
r[0] = '\\';
r[1] = 'n';
return 2;
} else if (c == '\t') {
r[0] = '\\';
r[1] = 't';
return 2;
} else if (c < 8 && !IsOctDigit(next)) {
r[0] = '\\';
r[1] = OctDigit(c);
return 2;
} else if (!IsHexDigit(next)) {
r[0] = '\\';
r[1] = 'x';
r[2] = HexDigit((c & 0xF0) >> 4);
r[3] = HexDigit((c & 0x0F) >> 0);
return 4;
} else {
/* 扫描常数序列 */
static int ScanNumericLiteral (void)
{
unsigned char *start = CURRENT;
/* 表示数值是多少进制 */
unsigned char base = 10;
if ('.' == *CURRENT) {
return ScanFloatLiteral (start);
}
/* 扫描前半部分（小数点的左边） */
if ('0' == *CURRENT && ('x' == CURRENT[1] || 'X' == CURRENT[1])) {
base = 16;
start = (CURRENT += 2);
if (!IsHexDigit (*CURRENT)) {
Error (&TokenCoord, "Expect hex digit");
TokenValue.i[0] = 0;
return TK_INTCONST;
}
while (IsHexDigit (*CURRENT))
CURRENT++;
} else if ('0' == *CURRENT) {
base = 8;
while (IsOctDigit (*++CURRENT));
} else {
while (IsDigit (*++CURRENT));
}
/* 如果符合下边条件,按整形处理 */
if (16 == base || ('.' != *CURRENT && 'e' != *CURRENT && 'E' != *CURRENT))
return ScanIntLiteral (start, (int)(CURRENT - start), base);
else return ScanFloatLiteral (start);
}
/* 处理转移字符 */
static int ScanEscapeChar (int wide)
{
int i, v, overflow;
/* 跳过转移字符的 \ */
CURRENT++;
switch (*CURRENT++) {
/* 返回转义后的ASCII 值 */
case 'a': return '\a';
case 'b': return '\b';
case 'f': return '\f';
case 'n': return '\n';
case 'r': return '\r';
case 't': return '\t';
case 'v': return '\v';
/* 返回源字符的ASCII 值即可 */
case '\'': case '"':
case '\\': case '\?': return *(CURRENT-1);
case 'x':
/* ｘ之后若不是十六进制的数字则错误 */
if (!IsHexDigit (*CURRENT)) {
Error (&TokenCoord, "Expect hex digit");
return 'x';
}
/* 如果非宽字符
* 且从０开始可处理3个字符,
* 非０开始可处理2个字符
* 如果宽字符
* 且从０开始可处理9个字符,
* 非０开始可处理8个字符 */
i = ('0' == *CURRENT ? 0 : 1) + (wide ? 0 : 6);
for (v = 0; i < 9 && IsHexDigit (*CURRENT); CURRENT++, i++) {
v = (v << 4) + (IsDigit (*CURRENT) ? (*CURRENT-'0') :
(ToUpper (*CURRENT) - 'A' + 10));
}
/* 如果ｉ不到９则字符中间有非法字符 */
if (9 != i)
Warning (&TokenCoord, "Hexademical espace sequence overflo");
return v;
/* 处理八进制 */
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
/* 如果非宽字符
* 且从０开始可处理三个字符,
* 非０开始可处理两个字符
* 若是宽字符可处理三个字符 */
v = *(CURRENT - 1) - '0';
//i = wide ?
for (i = v ? 1 : 0; i < 2 && IsOctDigit (*CURRENT); i++)
v = (v << 3) + *CURRENT++ - '0';
return v;
default:
Warning (&TokenCoord, "Unrecognized escape sequence: \\%c", *CURRENT);
return *CURRENT;
}
}
