forked from OSchip/llvm-project
96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
//===-- Regex.cpp - Regular Expression matcher implementation -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a POSIX regular expression matcher.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Regex.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SmallVector.h"
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#include "regex_impl.h"
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#include <string>
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using namespace llvm;
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Regex::Regex(const StringRef ®ex, unsigned Flags) {
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unsigned flags = 0;
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preg = new llvm_regex();
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preg->re_endp = regex.end();
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if (Flags & IgnoreCase)
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flags |= REG_ICASE;
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if (Flags & NoSub) {
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flags |= REG_NOSUB;
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sub = false;
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} else {
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sub = true;
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}
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if (Flags & Newline)
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flags |= REG_NEWLINE;
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error = llvm_regcomp(preg, regex.data(), flags|REG_EXTENDED|REG_PEND);
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}
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bool Regex::isValid(std::string &Error) {
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if (!error)
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return true;
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size_t len = llvm_regerror(error, preg, NULL, 0);
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Error.resize(len);
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llvm_regerror(error, preg, &Error[0], len);
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return false;
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}
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Regex::~Regex() {
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llvm_regfree(preg);
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delete preg;
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}
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bool Regex::match(const StringRef &String, SmallVectorImpl<StringRef> *Matches){
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unsigned nmatch = Matches ? preg->re_nsub+1 : 0;
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if (Matches) {
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assert(sub && "Substring matching requested but pattern compiled without");
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Matches->clear();
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}
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// pmatch needs to have at least one element.
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SmallVector<llvm_regmatch_t, 8> pm;
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pm.resize(nmatch > 0 ? nmatch : 1);
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pm[0].rm_so = 0;
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pm[0].rm_eo = String.size();
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int rc = llvm_regexec(preg, String.data(), nmatch, pm.data(), REG_STARTEND);
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if (rc == REG_NOMATCH)
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return false;
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if (rc != 0) {
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// regexec can fail due to invalid pattern or running out of memory.
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error = rc;
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return false;
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}
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// There was a match.
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if (Matches) { // match position requested
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for (unsigned i = 0; i != nmatch; ++i) {
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if (pm[i].rm_so == -1) {
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// this group didn't match
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Matches->push_back(StringRef());
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continue;
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}
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assert(pm[i].rm_eo > pm[i].rm_so);
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Matches->push_back(StringRef(String.data()+pm[i].rm_so,
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pm[i].rm_eo-pm[i].rm_so));
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}
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}
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return true;
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}
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