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65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
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//===-- 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.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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struct llvm_regex;
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namespace llvm {
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class Regex {
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public:
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enum {
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/// Compile with support for subgroup matches, this is just to make
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/// constructs like Regex("...", 0) more readable as Regex("...", Sub).
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Sub=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 matching that need only report success or failure,
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/// not what was matched.
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NoSub=2,
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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=4
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};
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/// Compiles the given POSIX Extended Regular Expression \arg Regex.
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/// This implementation supports regexes and matching strings with embedded
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/// NUL characters.
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Regex(const StringRef &Regex, unsigned Flags=NoSub);
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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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/// matches - Match the regex against a given \arg String.
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///
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/// \param Matches - If given, on a succesful match this will be filled in
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/// with references to the matched group expressions (inside \arg String),
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/// the first group is always the entire pattern.
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/// By default the regex is compiled with NoSub, which disables support for
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/// Matches.
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/// For this feature to be enabled you must construct the regex using
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/// Regex("...", Regex::Sub) constructor.
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bool match(const StringRef &String, SmallVectorImpl<StringRef> *Matches=0);
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private:
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struct llvm_regex *preg;
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int error;
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bool sub;
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};
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}
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