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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "string_search_helper.h"
#include <vespa/searchlib/query/query_term_ucs4.h>
#include <vespa/vespalib/text/lowercase.h>
#include <vespa/vespalib/text/utf8.h>
#include <vespa/vespalib/fuzzy/fuzzy_matcher.h>
namespace search::attribute {
StringSearchHelper::StringSearchHelper(QueryTermUCS4 & term, bool cased, vespalib::FuzzyMatchingAlgorithm fuzzy_matching_algorithm)
: _regex(),
_fuzzyMatcher(),
_term(),
_termLen(),
_isPrefix(term.isPrefix()),
_isRegex(term.isRegex()),
_isCased(cased),
_isFuzzy(term.isFuzzy())
{
if (isRegex()) {
_regex = (isCased())
? vespalib::Regex::from_pattern(term.getTerm(), vespalib::Regex::Options::None)
: vespalib::Regex::from_pattern(term.getTerm(), vespalib::Regex::Options::IgnoreCase);
} else if (isFuzzy()) {
(void) fuzzy_matching_algorithm;
// TODO: Select implementation based on algorithm.
_fuzzyMatcher = std::make_unique<vespalib::FuzzyMatcher>(term.getTerm(),
term.getFuzzyMaxEditDistance(),
term.getFuzzyPrefixLength(),
isCased());
} else if (isCased()) {
_term = term.getTerm();
_termLen = strlen(_term);
} else {
_ucs4 = term.asUcs4();
}
}
StringSearchHelper::StringSearchHelper(StringSearchHelper&&) noexcept = default;
StringSearchHelper::~StringSearchHelper() = default;
bool
StringSearchHelper::isMatch(const char *src) const noexcept {
if (__builtin_expect(isRegex(), false)) {
return getRegex().valid() && getRegex().partial_match(std::string_view(src));
}
if (__builtin_expect(isFuzzy(), false)) {
return getFuzzyMatcher().isMatch(src);
}
if (__builtin_expect(isCased(), false)) {
int res = strncmp(_term, src, _termLen);
return (res == 0) && (src[_termLen] == 0 || isPrefix());
}
vespalib::Utf8ReaderForZTS u8reader(src);
uint32_t j = 0;
uint32_t val;
for (;; ++j) {
val = u8reader.getChar();
val = vespalib::LowerCase::convert(val);
if (_ucs4[j] == 0 || _ucs4[j] != val) {
break;
}
}
return (_ucs4[j] == 0 && (val == 0 || isPrefix()));
}
}
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