X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FRegex.h;h=82df2c67bd027eb22d8f37de943766c0920970c9;hb=717a142823f84bd3aa958755ead1d991860ca8f4;hp=c954c0d31abe21aaf7396a7a4882f26d189af605;hpb=81f46d9ce1888308b33336f9bea72147430da36b;p=oota-llvm.git diff --git a/include/llvm/Support/Regex.h b/include/llvm/Support/Regex.h index c954c0d31ab..82df2c67bd0 100644 --- a/include/llvm/Support/Regex.h +++ b/include/llvm/Support/Regex.h @@ -7,10 +7,16 @@ // //===----------------------------------------------------------------------===// // -// This file implements a POSIX regular expression matcher. +// 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 struct llvm_regex; @@ -18,7 +24,7 @@ struct llvm_regex; namespace llvm { class StringRef; template class SmallVectorImpl; - + class Regex { public: enum { @@ -26,17 +32,19 @@ namespace llvm { /// 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 + /// 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 + 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 POSIX Extended Regular Expression \arg Regex. - /// This implementation supports regexes and matching strings with embedded - /// NUL characters. - Regex(const StringRef &Regex, unsigned Flags = NoFlags); + /// Compiles the given regular expression \p Regex. + Regex(StringRef Regex, unsigned Flags = NoFlags); ~Regex(); /// isValid - returns the error encountered during regex compilation, or @@ -47,17 +55,32 @@ namespace llvm { /// 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. + + /// matches - Match the regex against a given \p String. /// - /// \param Matches - If given, on a succesful match this will be filled in - /// with references to the matched group expressions (inside \arg 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(const StringRef &String, SmallVectorImpl *Matches=0); + bool match(StringRef String, SmallVectorImpl *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); + private: struct llvm_regex *preg; int error; }; } + +#endif // LLVM_SUPPORT_REGEX_H