static pANTLR3_COMMON_TOKEN
LB(pANTLR3_COMMON_TOKEN_STREAM cts, ANTLR3_INT32 k)
{
ANTLR3_INT32 i;
ANTLR3_INT32 n;
if (cts->p == -1)
{
fillBuffer(cts);
}
if (k == 0)
{
return NULL;
}
if ((cts->p - k) < 0)
{
return NULL;
}
i = cts->p;
n = 1;
/* Need to find k good tokens, going backwards, skipping ones that are off channel
*/
while (n <= (ANTLR3_INT32) k)
{
/* Skip off-channel tokens
*/
i = skipOffTokenChannelsReverse(cts, i - 1); /* leave p on valid token */
n++;
}
if (i < 0)
{
return NULL;
}
// Here the token must be in the input vector. Rather then incut
// function call penalty, we jsut return the pointer directly
// from the vector
//
return (pANTLR3_COMMON_TOKEN)cts->tokens->elements[i].element;
}
static pANTLR3_COMMON_TOKEN
LB (pANTLR3_COMMON_TOKEN_STREAM cts, ANTLR3_INT32 k)
{
ANTLR3_INT32 i;
ANTLR3_INT32 n;
if (cts->p == -1)
{
fillBuffer(cts);
}
if (k == 0)
{
return NULL;
}
if ((cts->p - k) < 0)
{
return NULL;
}
i = cts->p;
n = 1;
/* Need to find k good tokens, going backwards, skipping ones that are off channel
*/
while ( n <= (ANTLR3_INT32)k )
{
/* Skip off-channel tokens
*/
i = skipOffTokenChannelsReverse(cts, i-1); /* leave p on valid token */
n++;
}
if ( i <0 )
{
return NULL;
}
return (pANTLR3_COMMON_TOKEN)cts->tokens->get(cts->tokens, i);
}
