Minor optimizations to TrxBoundaryParser
This commit is contained in:
Johan Wikman
parent
96f0321b7e
commit
c51cd8858d
@ -542,12 +542,23 @@ private:
|
||||
return type_mask;
|
||||
}
|
||||
|
||||
inline bool is_next_alpha(char uc, int offset = 1) const
|
||||
{
|
||||
ss_dassert(uc >= 'A' && uc <= 'Z');
|
||||
|
||||
char lc = uc + ('a' - 'A');
|
||||
|
||||
return
|
||||
((m_pI + offset) < m_pEnd) &&
|
||||
((*(m_pI + offset) == uc) || (*(m_pI + offset) == lc));
|
||||
}
|
||||
|
||||
bool is_next_char(char c, int offset = 1) const
|
||||
{
|
||||
return ((m_pI + offset) < m_pEnd) && (*(m_pI + offset) == c);
|
||||
}
|
||||
|
||||
bool get_next_char(char* pC) const
|
||||
bool peek_next_char(char* pC) const
|
||||
{
|
||||
bool rc = (m_pI + 1 < m_pEnd);
|
||||
|
||||
@ -559,20 +570,28 @@ private:
|
||||
return rc;
|
||||
}
|
||||
|
||||
// Significantly faster than library version.
|
||||
static char toupper(char c)
|
||||
{
|
||||
return (c >= 'a' && c <='z') ? c - ('a' - 'A') : c;
|
||||
}
|
||||
|
||||
token_t expect_token(const char* zWord, int len, token_t token)
|
||||
{
|
||||
const char* pNext = m_pI;
|
||||
const char* pI = m_pI;
|
||||
const char* pEnd = zWord + len;
|
||||
|
||||
while ((pNext < m_pEnd) && (isalpha(*pNext) || (*pNext == '@')))
|
||||
while ((pI < m_pEnd) && (zWord < pEnd) && (toupper(*pI) == *zWord))
|
||||
{
|
||||
++pNext;
|
||||
++pI;
|
||||
++zWord;
|
||||
}
|
||||
|
||||
if (pNext - m_pI == len)
|
||||
if (zWord == pEnd)
|
||||
{
|
||||
if (strncasecmp(m_pI, zWord, len) == 0)
|
||||
if ((pI == m_pEnd) || (!isalpha(*pI))) // Handwritten isalpha not faster than library version.
|
||||
{
|
||||
m_pI = pNext;
|
||||
m_pI = pI;
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -723,28 +742,28 @@ private:
|
||||
switch (*m_pI)
|
||||
{
|
||||
case '@':
|
||||
if (is_next_char('a', 2) || is_next_char('A', 2))
|
||||
if (is_next_alpha('A', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("@@autocommit"), TK_AUTOCOMMIT);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("@@AUTOCOMMIT"), TK_AUTOCOMMIT);
|
||||
}
|
||||
if (is_next_char('s', 2) || is_next_char('S', 2))
|
||||
else if (is_next_alpha('S', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("@@session"), TK_SESSION_VAR);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("@@SESSION"), TK_SESSION_VAR);
|
||||
}
|
||||
else if (is_next_char('g', 2) || is_next_char('G', 2))
|
||||
else if (is_next_alpha('G', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("@@global"), TK_GLOBAL_VAR);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("@@GLOBAL"), TK_GLOBAL_VAR);
|
||||
}
|
||||
break;
|
||||
|
||||
case 'a':
|
||||
case 'A':
|
||||
token = expect_token(TBP_EXPECT_TOKEN("autocommit"), TK_AUTOCOMMIT);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("AUTOCOMMIT"), TK_AUTOCOMMIT);
|
||||
break;
|
||||
|
||||
case 'b':
|
||||
case 'B':
|
||||
token = expect_token(TBP_EXPECT_TOKEN("begin"), TK_BEGIN);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("BEGIN"), TK_BEGIN);
|
||||
break;
|
||||
|
||||
case ',':
|
||||
@ -754,15 +773,15 @@ private:
|
||||
|
||||
case 'c':
|
||||
case 'C':
|
||||
if (is_next_char('o') || is_next_char('O'))
|
||||
if (is_next_alpha('O'))
|
||||
{
|
||||
if (is_next_char('m', 2) || is_next_char('M', 2))
|
||||
if (is_next_alpha('M', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("commit"), TK_COMMIT);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("COMMIT"), TK_COMMIT);
|
||||
}
|
||||
else if (is_next_char('n', 2) || is_next_char('N', 2))
|
||||
else if (is_next_alpha('N', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("consistent"), TK_CONSISTENT);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("CONSISTENT"), TK_CONSISTENT);
|
||||
}
|
||||
}
|
||||
break;
|
||||
@ -779,18 +798,18 @@ private:
|
||||
|
||||
case 'f':
|
||||
case 'F':
|
||||
token = expect_token(TBP_EXPECT_TOKEN("false"), TK_FALSE);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("FALSE"), TK_FALSE);
|
||||
break;
|
||||
|
||||
case 'g':
|
||||
case 'G':
|
||||
token = expect_token(TBP_EXPECT_TOKEN("global"), TK_GLOBAL);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("GLOBAL"), TK_GLOBAL);
|
||||
break;
|
||||
|
||||
case '1':
|
||||
{
|
||||
char c;
|
||||
if (!get_next_char(&c) || !isdigit(c))
|
||||
if (!peek_next_char(&c) || !isdigit(c))
|
||||
{
|
||||
++m_pI;
|
||||
token = TK_ONE;
|
||||
@ -800,93 +819,93 @@ private:
|
||||
|
||||
case 'o':
|
||||
case 'O':
|
||||
if (is_next_char('f') || is_next_char('F'))
|
||||
if (is_next_alpha('F'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("off"), TK_ZERO);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("OFF"), TK_ZERO);
|
||||
}
|
||||
else if (is_next_char('n') || is_next_char('N'))
|
||||
else if (is_next_alpha('N'))
|
||||
{
|
||||
if (is_next_char('l', 2) || is_next_char('L', 2))
|
||||
if (is_next_char('L', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("only"), TK_ONLY);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("ONLY"), TK_ONLY);
|
||||
}
|
||||
else
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("on"), TK_ONE);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("ON"), TK_ONE);
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case 'r':
|
||||
case 'R':
|
||||
if (is_next_char('e') || is_next_char('E'))
|
||||
if (is_next_alpha('E'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("read"), TK_READ);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("READ"), TK_READ);
|
||||
}
|
||||
else if (is_next_char('o') || is_next_char('O'))
|
||||
else if (is_next_alpha('O'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("rollback"), TK_ROLLBACK);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("ROLLBACK"), TK_ROLLBACK);
|
||||
}
|
||||
break;
|
||||
|
||||
case 's':
|
||||
case 'S':
|
||||
if (is_next_char('e') || is_next_char('E'))
|
||||
if (is_next_alpha('E'))
|
||||
{
|
||||
if (is_next_char('s', 2) || is_next_char('S', 2))
|
||||
if (is_next_alpha('S', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("session"), TK_SESSION);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("SESSION"), TK_SESSION);
|
||||
}
|
||||
else
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("set"), TK_SET);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("SET"), TK_SET);
|
||||
}
|
||||
}
|
||||
else if (is_next_char('n') || is_next_char('N'))
|
||||
else if (is_next_alpha('N'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("snapshot"), TK_SNAPSHOT);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("SNAPSHOT"), TK_SNAPSHOT);
|
||||
}
|
||||
else if (is_next_char('t') || is_next_char('T'))
|
||||
else if (is_next_char('T'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("start"), TK_START);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("START"), TK_START);
|
||||
}
|
||||
break;
|
||||
|
||||
case 't':
|
||||
case 'T':
|
||||
if (is_next_char('r') || is_next_char('R'))
|
||||
if (is_next_alpha('R'))
|
||||
{
|
||||
if (is_next_char('a', 2) || is_next_char('A', 2))
|
||||
if (is_next_alpha('A', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("transaction"), TK_TRANSACTION);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("TRANSACTION"), TK_TRANSACTION);
|
||||
}
|
||||
else if (is_next_char('u', 2) || is_next_char('U', 2))
|
||||
else if (is_next_alpha('U', 2))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("true"), TK_TRUE);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("TRUE"), TK_TRUE);
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case 'w':
|
||||
case 'W':
|
||||
if (is_next_char('i') || is_next_char('I'))
|
||||
if (is_next_alpha('I'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("with"), TK_WITH);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("WITH"), TK_WITH);
|
||||
}
|
||||
else if (is_next_char('o') || is_next_char('O'))
|
||||
else if (is_next_alpha('O'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("work"), TK_WORK);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("WORK"), TK_WORK);
|
||||
}
|
||||
else if (is_next_char('r') || is_next_char('R'))
|
||||
else if (is_next_alpha('R'))
|
||||
{
|
||||
token = expect_token(TBP_EXPECT_TOKEN("write"), TK_WRITE);
|
||||
token = expect_token(TBP_EXPECT_TOKEN("WRITE"), TK_WRITE);
|
||||
}
|
||||
break;
|
||||
|
||||
case '0':
|
||||
{
|
||||
char c;
|
||||
if (!get_next_char(&c) || !isdigit(c))
|
||||
if (!peek_next_char(&c) || !isdigit(c))
|
||||
{
|
||||
++m_pI;
|
||||
token = TK_ZERO;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user