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#include "re1.5.h"
int _re1_5_classmatch(const char *pc, const char *sp)
{
// pc points to "cnt" byte after opcode
int is_positive = (pc[-1] == Class);
int cnt = *pc++;
while (cnt--) {
if (*pc == RE15_CLASS_NAMED_CLASS_INDICATOR) {
if (_re1_5_namedclassmatch(pc + 1, sp)) {
return is_positive;
}
} else {
if (*sp >= *pc && *sp <= pc[1]) {
return is_positive;
}
}
pc += 2;
}
return !is_positive;
}
int _re1_5_namedclassmatch(const char *pc, const char *sp)
{
// pc points to name of class
int off = (*pc >> 5) & 1;
if ((*pc | 0x20) == 'd') {
if (!(*sp >= '0' && *sp <= '9')) {
off ^= 1;
}
} else if ((*pc | 0x20) == 's') {
if (!(*sp == ' ' || (*sp >= '\t' && *sp <= '\r'))) {
off ^= 1;
}
} else { // w
if (!((*sp >= 'A' && *sp <= 'Z') || (*sp >= 'a' && *sp <= 'z') || (*sp >= '0' && *sp <= '9') || *sp == '_')) {
off ^= 1;
}
}
return off;
}
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