fixed_length.cc

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#include "src/util/c99_stdint.h"

#include "src/ir/regexp/regexp.h"
#include "src/ir/regexp/regexp_alt.h"
#include "src/ir/regexp/regexp_cat.h"
#include "src/ir/regexp/regexp_match.h"
#include "src/ir/regexp/regexp_null.h"

namespace re2c
{

uint32_t RegExp::fixedLength ()
{
    return ~0u;
}

uint32_t AltOp::fixedLength ()
{
    uint32_t l1 = exp1->fixedLength ();
    uint32_t l2 = exp1->fixedLength ();

    if (l1 != l2 || l1 == ~0u)
    {
        return ~0u;
    }

    return l1;
}

uint32_t CatOp::fixedLength ()
{
    const uint32_t l1 = exp1->fixedLength ();
    if (l1 != ~0u)
    {
        const uint32_t l2 = exp2->fixedLength ();
        if (l2 != ~0u)
        {
            return l1 + l2;
        }
    }
    return ~0u;
}

uint32_t MatchOp::fixedLength ()
{
    return 1;
}

uint32_t NullOp::fixedLength ()
{
    return 0;
}

} // end namespace re2c