mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-02 04:22:03 +00:00
114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
// Copyright 2010 The RE2 Authors. All Rights Reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
#include "re2/set.h"
|
|
|
|
#include "util/util.h"
|
|
#include "re2/stringpiece.h"
|
|
#include "re2/prog.h"
|
|
#include "re2/re2.h"
|
|
#include "re2/regexp.h"
|
|
|
|
using namespace re2;
|
|
|
|
RE2::Set::Set(const RE2::Options& options, RE2::Anchor anchor) {
|
|
options_.Copy(options);
|
|
anchor_ = anchor;
|
|
prog_ = NULL;
|
|
compiled_ = false;
|
|
}
|
|
|
|
RE2::Set::~Set() {
|
|
for (size_t i = 0; i < re_.size(); i++)
|
|
re_[i]->Decref();
|
|
delete prog_;
|
|
}
|
|
|
|
int RE2::Set::Add(const StringPiece& pattern, string* error) {
|
|
if (compiled_) {
|
|
LOG(DFATAL) << "RE2::Set::Add after Compile";
|
|
return -1;
|
|
}
|
|
|
|
Regexp::ParseFlags pf = static_cast<Regexp::ParseFlags>(
|
|
options_.ParseFlags());
|
|
|
|
RegexpStatus status;
|
|
re2::Regexp* re = Regexp::Parse(pattern, pf, &status);
|
|
if (re == NULL) {
|
|
if (error != NULL)
|
|
*error = status.Text();
|
|
if (options_.log_errors())
|
|
LOG(ERROR) << "Error parsing '" << pattern << "': " << status.Text();
|
|
return -1;
|
|
}
|
|
|
|
// Concatenate with match index and push on vector.
|
|
int n = re_.size();
|
|
re2::Regexp* m = re2::Regexp::HaveMatch(n, pf);
|
|
if (re->op() == kRegexpConcat) {
|
|
int nsub = re->nsub();
|
|
re2::Regexp** sub = new re2::Regexp*[nsub + 1];
|
|
for (int i = 0; i < nsub; i++)
|
|
sub[i] = re->sub()[i]->Incref();
|
|
sub[nsub] = m;
|
|
re->Decref();
|
|
re = re2::Regexp::Concat(sub, nsub + 1, pf);
|
|
delete[] sub;
|
|
} else {
|
|
re2::Regexp* sub[2];
|
|
sub[0] = re;
|
|
sub[1] = m;
|
|
re = re2::Regexp::Concat(sub, 2, pf);
|
|
}
|
|
re_.push_back(re);
|
|
return n;
|
|
}
|
|
|
|
bool RE2::Set::Compile() {
|
|
if (compiled_) {
|
|
LOG(DFATAL) << "RE2::Set::Compile multiple times";
|
|
return false;
|
|
}
|
|
compiled_ = true;
|
|
|
|
Regexp::ParseFlags pf = static_cast<Regexp::ParseFlags>(
|
|
options_.ParseFlags());
|
|
re2::Regexp* re = re2::Regexp::Alternate(const_cast<re2::Regexp**>(&re_[0]),
|
|
re_.size(), pf);
|
|
re_.clear();
|
|
re2::Regexp* sre = re->Simplify();
|
|
re->Decref();
|
|
re = sre;
|
|
if (re == NULL) {
|
|
if (options_.log_errors())
|
|
LOG(ERROR) << "Error simplifying during Compile.";
|
|
return false;
|
|
}
|
|
|
|
prog_ = Prog::CompileSet(options_, anchor_, re);
|
|
return prog_ != NULL;
|
|
}
|
|
|
|
bool RE2::Set::Match(const StringPiece& text, vector<int>* v) const {
|
|
if (!compiled_) {
|
|
LOG(DFATAL) << "RE2::Set::Match without Compile";
|
|
return false;
|
|
}
|
|
v->clear();
|
|
bool failed;
|
|
bool ret = prog_->SearchDFA(text, text, Prog::kAnchored,
|
|
Prog::kManyMatch, NULL, &failed, v);
|
|
if (failed)
|
|
LOG(DFATAL) << "RE2::Set::Match: DFA ran out of cache space";
|
|
|
|
if (ret == false)
|
|
return false;
|
|
if (v->size() == 0) {
|
|
LOG(DFATAL) << "RE2::Set::Match: match but unknown regexp set";
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|