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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <sys/types.h>
#include <regex.h>
#include <vespa/vespalib/util/regexp.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/util/exceptions.h>
#include <vespa/log/log.h>
LOG_SETUP(".vespalib.util.regexp");
namespace vespalib {
namespace {
bool has_option(vespalib::stringref re) {
return (re.find('|') != re.npos);
}
bool maybe_none(char c) {
return ((c == '{') ||
(c == '*') ||
(c == '?'));
}
const vespalib::string special("^|()[]{}.*?+\\$");
bool is_special(char c) { return special.find(c) != special.npos; }
vespalib::string escape(vespalib::stringref str) {
vespalib::string result;
for (char c: str) {
if (is_special(c)) {
result.push_back('\\');
}
result.push_back(c);
}
return result;
}
} // namespace vespalib::<unnamed>
vespalib::string
RegexpUtil::get_prefix(vespalib::stringref re)
{
vespalib::string prefix;
if ((re.size() > 0) && (re.data()[0] == '^') && !has_option(re)) {
const char *end = re.data() + re.size();
const char *pos = re.data() + 1;
for (; (pos < end) && !is_special(*pos); ++pos) {
prefix.push_back(*pos);
}
if ((pos < end) && maybe_none(*pos) && !prefix.empty()) {
prefix.resize(prefix.size() - 1); // pop_back
}
}
return prefix;
}
vespalib::string
RegexpUtil::make_from_suffix(vespalib::stringref suffix)
{
return escape(suffix) + "$";
}
vespalib::string
RegexpUtil::make_from_substring(vespalib::stringref substring)
{
return escape(substring);
}
} // namespace vespalib
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