mirror of
https://github.com/ClickHouse/ClickHouse.git
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114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
// Copyright 2010 The RE2 Authors. All Rights Reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "re2/set.h"
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#include "util/util.h"
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#include "re2/stringpiece.h"
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#include "re2/prog.h"
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#include "re2/re2.h"
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#include "re2/regexp.h"
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using namespace re2;
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RE2::Set::Set(const RE2::Options& options, RE2::Anchor anchor) {
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options_.Copy(options);
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anchor_ = anchor;
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prog_ = NULL;
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compiled_ = false;
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}
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RE2::Set::~Set() {
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for (size_t i = 0; i < re_.size(); i++)
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re_[i]->Decref();
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delete prog_;
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}
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int RE2::Set::Add(const StringPiece& pattern, string* error) {
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if (compiled_) {
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LOG(DFATAL) << "RE2::Set::Add after Compile";
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return -1;
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}
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Regexp::ParseFlags pf = static_cast<Regexp::ParseFlags>(
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options_.ParseFlags());
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RegexpStatus status;
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re2::Regexp* re = Regexp::Parse(pattern, pf, &status);
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if (re == NULL) {
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if (error != NULL)
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*error = status.Text();
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if (options_.log_errors())
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LOG(ERROR) << "Error parsing '" << pattern << "': " << status.Text();
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return -1;
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}
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// Concatenate with match index and push on vector.
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int n = re_.size();
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re2::Regexp* m = re2::Regexp::HaveMatch(n, pf);
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if (re->op() == kRegexpConcat) {
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int nsub = re->nsub();
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re2::Regexp** sub = new re2::Regexp*[nsub + 1];
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for (int i = 0; i < nsub; i++)
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sub[i] = re->sub()[i]->Incref();
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sub[nsub] = m;
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re->Decref();
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re = re2::Regexp::Concat(sub, nsub + 1, pf);
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delete[] sub;
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} else {
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re2::Regexp* sub[2];
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sub[0] = re;
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sub[1] = m;
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re = re2::Regexp::Concat(sub, 2, pf);
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}
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re_.push_back(re);
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return n;
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}
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bool RE2::Set::Compile() {
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if (compiled_) {
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LOG(DFATAL) << "RE2::Set::Compile multiple times";
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return false;
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}
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compiled_ = true;
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Regexp::ParseFlags pf = static_cast<Regexp::ParseFlags>(
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options_.ParseFlags());
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re2::Regexp* re = re2::Regexp::Alternate(const_cast<re2::Regexp**>(&re_[0]),
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re_.size(), pf);
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re_.clear();
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re2::Regexp* sre = re->Simplify();
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re->Decref();
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re = sre;
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if (re == NULL) {
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if (options_.log_errors())
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LOG(ERROR) << "Error simplifying during Compile.";
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return false;
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}
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prog_ = Prog::CompileSet(options_, anchor_, re);
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return prog_ != NULL;
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}
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bool RE2::Set::Match(const StringPiece& text, vector<int>* v) const {
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if (!compiled_) {
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LOG(DFATAL) << "RE2::Set::Match without Compile";
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return false;
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}
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v->clear();
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bool failed;
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bool ret = prog_->SearchDFA(text, text, Prog::kAnchored,
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Prog::kManyMatch, NULL, &failed, v);
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if (failed)
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LOG(DFATAL) << "RE2::Set::Match: DFA ran out of cache space";
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if (ret == false)
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return false;
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if (v->size() == 0) {
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LOG(DFATAL) << "RE2::Set::Match: match but unknown regexp set";
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return false;
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}
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return true;
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}
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