mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
76eb77dd52
Both FileCheck and clang's -verify need to escape strings for regexes, so let's expose this as a utility in the Regex class. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197096 91177308-0d34-0410-b5e6-96231b3b80d8
94 lines
3.5 KiB
C++
94 lines
3.5 KiB
C++
//===-- 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. Both Basic and
|
|
// Extended POSIX regular expressions (ERE) are supported. EREs were extended
|
|
// to support backreferences in matches.
|
|
// This implementation also supports matching strings with embedded NUL chars.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#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,
|
|
/// By default, the POSIX extended regular expression (ERE) syntax is
|
|
/// assumed. Pass this flag to turn on basic regular expressions (BRE)
|
|
/// instead.
|
|
BasicRegex=4
|
|
};
|
|
|
|
/// Compiles the given regular expression \p Regex.
|
|
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 \p String.
|
|
///
|
|
/// \param Matches - If given, on a successful match this will be filled in
|
|
/// with references to the matched group expressions (inside \p 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
|
|
/// \p String with the \p 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);
|
|
|
|
/// \brief If this function returns true, ^Str$ is an extended regular
|
|
/// expression that matches Str and only Str.
|
|
static bool isLiteralERE(StringRef Str);
|
|
|
|
/// \brief Turn String into a regex by escaping its special characters.
|
|
static std::string escape(StringRef String);
|
|
|
|
private:
|
|
struct llvm_regex *preg;
|
|
int error;
|
|
};
|
|
}
|
|
|
|
#endif // LLVM_SUPPORT_REGEX_H
|