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annotate include/llvm/Support/Regex.h @ 33:e4204d083e25

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LLVM 3.5
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:32:10 +0900
parents 95c75e76d11b
children 54457678186b
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1 //===-- Regex.h - Regular Expression matcher implementation -*- C++ -*-----===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements a POSIX regular expression matcher. Both Basic and
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11 // Extended POSIX regular expressions (ERE) are supported. EREs were extended
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12 // to support backreferences in matches.
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13 // This implementation also supports matching strings with embedded NUL chars.
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #ifndef LLVM_SUPPORT_REGEX_H
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18 #define LLVM_SUPPORT_REGEX_H
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19
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20 #include <string>
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21
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22 struct llvm_regex;
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23
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24 namespace llvm {
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25 class StringRef;
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26 template<typename T> class SmallVectorImpl;
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27
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28 class Regex {
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29 public:
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30 enum {
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31 NoFlags=0,
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32 /// Compile for matching that ignores upper/lower case distinctions.
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33 IgnoreCase=1,
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34 /// Compile for newline-sensitive matching. With this flag '[^' bracket
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35 /// expressions and '.' never match newline. A ^ anchor matches the
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36 /// null string after any newline in the string in addition to its normal
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37 /// function, and the $ anchor matches the null string before any
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38 /// newline in the string in addition to its normal function.
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39 Newline=2,
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40 /// By default, the POSIX extended regular expression (ERE) syntax is
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41 /// assumed. Pass this flag to turn on basic regular expressions (BRE)
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42 /// instead.
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43 BasicRegex=4
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44 };
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45
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46 /// Compiles the given regular expression \p Regex.
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47 Regex(StringRef Regex, unsigned Flags = NoFlags);
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48 ~Regex();
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49
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50 /// isValid - returns the error encountered during regex compilation, or
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51 /// matching, if any.
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52 bool isValid(std::string &Error);
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53
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54 /// getNumMatches - In a valid regex, return the number of parenthesized
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55 /// matches it contains. The number filled in by match will include this
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56 /// many entries plus one for the whole regex (as element 0).
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57 unsigned getNumMatches() const;
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58
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59 /// matches - Match the regex against a given \p String.
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60 ///
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61 /// \param Matches - If given, on a successful match this will be filled in
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62 /// with references to the matched group expressions (inside \p String),
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63 /// the first group is always the entire pattern.
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64 ///
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65 /// This returns true on a successful match.
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66 bool match(StringRef String, SmallVectorImpl<StringRef> *Matches = 0);
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67
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68 /// sub - Return the result of replacing the first match of the regex in
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69 /// \p String with the \p Repl string. Backreferences like "\0" in the
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70 /// replacement string are replaced with the appropriate match substring.
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71 ///
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72 /// Note that the replacement string has backslash escaping performed on
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73 /// it. Invalid backreferences are ignored (replaced by empty strings).
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74 ///
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75 /// \param Error If non-null, any errors in the substitution (invalid
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76 /// backreferences, trailing backslashes) will be recorded as a non-empty
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77 /// string.
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78 std::string sub(StringRef Repl, StringRef String, std::string *Error = 0);
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79
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80 /// \brief If this function returns true, ^Str$ is an extended regular
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81 /// expression that matches Str and only Str.
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82 static bool isLiteralERE(StringRef Str);
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83
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84 /// \brief Turn String into a regex by escaping its special characters.
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85 static std::string escape(StringRef String);
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86
0
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87 private:
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88 struct llvm_regex *preg;
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89 int error;
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90 };
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91 }
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92
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93 #endif // LLVM_SUPPORT_REGEX_H