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//===-- Regex.h - Regular Expression matcher implementation -*- C++ -*-----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a POSIX regular expression matcher.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_REGEX_H
#define LLVM_SUPPORT_REGEX_H
#include <string>
struct llvm_regex;
namespace llvm {
class StringRef;
template<typename T> class SmallVectorImpl;
class Regex {
public:
enum {
NoFlags=0,
/// Compile for matching that ignores upper/lower case distinctions.
IgnoreCase=1,
/// Compile for newline-sensitive matching. With this flag '[^' bracket
/// expressions and '.' never match newline. A ^ anchor matches the
/// null string after any newline in the string in addition to its normal
/// function, and the $ anchor matches the null string before any
/// newline in the string in addition to its normal function.
Newline=2
};
/// Compiles the given POSIX Extended Regular Expression \arg Regex.
/// This implementation supports regexes and matching strings with embedded
/// NUL characters.
Regex(StringRef Regex, unsigned Flags = NoFlags);
~Regex();
/// isValid - returns the error encountered during regex compilation, or
/// matching, if any.
bool isValid(std::string &Error);
/// getNumMatches - In a valid regex, return the number of parenthesized
/// matches it contains. The number filled in by match will include this
/// many entries plus one for the whole regex (as element 0).
unsigned getNumMatches() const;
/// matches - Match the regex against a given \arg String.
///
/// \param Matches - If given, on a successful match this will be filled in
/// with references to the matched group expressions (inside \arg String),
/// the first group is always the entire pattern.
///
/// This returns true on a successful match.
bool match(StringRef String, SmallVectorImpl<StringRef> *Matches = 0);
/// sub - Return the result of replacing the first match of the regex in
/// \arg String with the \arg Repl string. Backreferences like "\0" in the
/// replacement string are replaced with the appropriate match substring.
///
/// Note that the replacement string has backslash escaping performed on
/// it. Invalid backreferences are ignored (replaced by empty strings).
///
/// \param Error If non-null, any errors in the substitution (invalid
/// backreferences, trailing backslashes) will be recorded as a non-empty
/// string.
std::string sub(StringRef Repl, StringRef String, std::string *Error = 0);
private:
struct llvm_regex *preg;
int error;
};
}
#endif // LLVM_SUPPORT_REGEX_H
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