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aa80e61b0d
This will be used to implement an optimisation for literal entries in special case lists. Differential Revision: http://llvm-reviews.chandlerc.com/D1278 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187731 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
3.4 KiB
C++
91 lines
3.4 KiB
C++
//===-- Regex.h - Regular Expression matcher implementation -*- C++ -*-----===//
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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. Both Basic and
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// Extended POSIX regular expressions (ERE) are supported. EREs were extended
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// to support backreferences in matches.
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// This implementation also supports matching strings with embedded NUL chars.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_REGEX_H
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#define LLVM_SUPPORT_REGEX_H
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#include <string>
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struct llvm_regex;
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namespace llvm {
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class StringRef;
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template<typename T> class SmallVectorImpl;
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class Regex {
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public:
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enum {
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NoFlags=0,
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/// Compile for matching that ignores upper/lower case distinctions.
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IgnoreCase=1,
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/// Compile for newline-sensitive matching. With this flag '[^' bracket
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/// expressions and '.' never match newline. A ^ anchor matches the
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/// null string after any newline in the string in addition to its normal
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/// function, and the $ anchor matches the null string before any
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/// newline in the string in addition to its normal function.
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Newline=2,
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/// By default, the POSIX extended regular expression (ERE) syntax is
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/// assumed. Pass this flag to turn on basic regular expressions (BRE)
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/// instead.
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BasicRegex=4
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};
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/// Compiles the given regular expression \p Regex.
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Regex(StringRef Regex, unsigned Flags = NoFlags);
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~Regex();
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/// isValid - returns the error encountered during regex compilation, or
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/// matching, if any.
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bool isValid(std::string &Error);
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/// getNumMatches - In a valid regex, return the number of parenthesized
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/// matches it contains. The number filled in by match will include this
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/// many entries plus one for the whole regex (as element 0).
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unsigned getNumMatches() const;
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/// matches - Match the regex against a given \p String.
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///
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/// \param Matches - If given, on a successful match this will be filled in
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/// with references to the matched group expressions (inside \p String),
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/// the first group is always the entire pattern.
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///
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/// This returns true on a successful match.
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bool match(StringRef String, SmallVectorImpl<StringRef> *Matches = 0);
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/// sub - Return the result of replacing the first match of the regex in
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/// \p String with the \p Repl string. Backreferences like "\0" in the
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/// replacement string are replaced with the appropriate match substring.
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///
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/// Note that the replacement string has backslash escaping performed on
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/// it. Invalid backreferences are ignored (replaced by empty strings).
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///
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/// \param Error If non-null, any errors in the substitution (invalid
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/// backreferences, trailing backslashes) will be recorded as a non-empty
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/// string.
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std::string sub(StringRef Repl, StringRef String, std::string *Error = 0);
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/// \brief If this function returns true, ^Str$ is an extended regular
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/// expression that matches Str and only Str.
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static bool isLiteralERE(StringRef Str);
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private:
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struct llvm_regex *preg;
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int error;
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};
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}
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#endif // LLVM_SUPPORT_REGEX_H
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