1 //===-- RegularExpression.h -------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef liblldb_RegularExpression_h_
11 #define liblldb_RegularExpression_h_
14 #include "../lib/Support/regex_impl.h"
16 typedef llvm_regmatch_t regmatch_t;
17 typedef llvm_regex_t regex_t;
19 inline int regcomp(llvm_regex_t *a, const char *b, int c) {
20 return llvm_regcomp(a, b, c);
23 inline size_t regerror(int a, const llvm_regex_t *b, char *c, size_t d) {
24 return llvm_regerror(a, b, c, d);
27 inline int regexec(const llvm_regex_t *a, const char *b, size_t c,
28 llvm_regmatch_t d[], int e) {
29 return llvm_regexec(a, b, c, d, e);
32 inline void regfree(llvm_regex_t *a) { llvm_regfree(a); }
48 namespace lldb_private {
50 //----------------------------------------------------------------------
51 /// @class RegularExpression RegularExpression.h "lldb/Core/RegularExpression.h"
52 /// @brief A C++ wrapper class for regex.
54 /// This regular expression class wraps the posix regex functions
55 /// \c regcomp(), \c regerror(), \c regexec(), and \c regfree() from
56 /// the header file in \c /usr/include/regex\.h.
57 //----------------------------------------------------------------------
58 class RegularExpression {
62 Match(uint32_t max_matches) : m_matches() {
64 m_matches.resize(max_matches + 1);
68 const size_t num_matches = m_matches.size();
69 regmatch_t invalid_match = {-1, -1};
70 for (size_t i = 0; i < num_matches; ++i)
71 m_matches[i] = invalid_match;
74 size_t GetSize() const { return m_matches.size(); }
76 regmatch_t *GetData() {
77 return (m_matches.empty() ? nullptr : m_matches.data());
80 bool GetMatchAtIndex(llvm::StringRef s, uint32_t idx,
81 std::string &match_str) const;
83 bool GetMatchAtIndex(llvm::StringRef s, uint32_t idx,
84 llvm::StringRef &match_str) const;
86 bool GetMatchSpanningIndices(llvm::StringRef s, uint32_t idx1,
88 llvm::StringRef &match_str) const;
91 std::vector<regmatch_t>
92 m_matches; ///< Where parenthesized subexpressions results are stored
95 //------------------------------------------------------------------
96 /// Default constructor.
98 /// The default constructor that initializes the object state such
99 /// that it contains no compiled regular expression.
100 //------------------------------------------------------------------
103 explicit RegularExpression(llvm::StringRef string);
105 //------------------------------------------------------------------
108 /// Any previously compiled regular expression contained in this
109 /// object will be freed.
110 //------------------------------------------------------------------
111 ~RegularExpression();
113 RegularExpression(const RegularExpression &rhs);
115 const RegularExpression &operator=(const RegularExpression &rhs);
117 //------------------------------------------------------------------
118 /// Compile a regular expression.
120 /// Compile a regular expression using the supplied regular
121 /// expression text. The compiled regular expression lives
122 /// in this object so that it can be readily used for regular
123 /// expression matches. Execute() can be called after the regular
124 /// expression is compiled. Any previously compiled regular
125 /// expression contained in this object will be freed.
128 /// A NULL terminated C string that represents the regular
129 /// expression to compile.
132 /// \b true if the regular expression compiles successfully,
133 /// \b false otherwise.
134 //------------------------------------------------------------------
135 bool Compile(llvm::StringRef string);
136 bool Compile(const char *) = delete;
138 //------------------------------------------------------------------
139 /// Executes a regular expression.
141 /// Execute a regular expression match using the compiled regular
142 /// expression that is already in this object against the match
143 /// string \a s. If any parens are used for regular expression
144 /// matches \a match_count should indicate the number of regmatch_t
145 /// values that are present in \a match_ptr.
147 /// @param[in] string
148 /// The string to match against the compile regular expression.
151 /// A pointer to a RegularExpression::Match structure that was
152 /// properly initialized with the desired number of maximum
153 /// matches, or nullptr if no parenthesized matching is needed.
156 /// \b true if \a string matches the compiled regular
157 /// expression, \b false otherwise.
158 //------------------------------------------------------------------
159 bool Execute(llvm::StringRef string, Match *match = nullptr) const;
160 bool Execute(const char *, Match * = nullptr) = delete;
162 size_t GetErrorAsCString(char *err_str, size_t err_str_max_len) const;
164 //------------------------------------------------------------------
165 /// Free the compiled regular expression.
167 /// If this object contains a valid compiled regular expression,
168 /// this function will free any resources it was consuming.
169 //------------------------------------------------------------------
172 //------------------------------------------------------------------
173 /// Access the regular expression text.
175 /// Returns the text that was used to compile the current regular
179 /// The NULL terminated C string that was used to compile the
180 /// current regular expression
181 //------------------------------------------------------------------
182 llvm::StringRef GetText() const;
184 //------------------------------------------------------------------
187 /// Test if this object contains a valid regular expression.
190 /// \b true if the regular expression compiled and is ready
191 /// for execution, \b false otherwise.
192 //------------------------------------------------------------------
193 bool IsValid() const;
201 int GetErrorCode() const { return m_comp_err; }
203 bool operator<(const RegularExpression &rhs) const;
206 //------------------------------------------------------------------
208 //------------------------------------------------------------------
209 std::string m_re; ///< A copy of the original regular expression text
210 int m_comp_err; ///< Error code for the regular expression compilation
211 regex_t m_preg; ///< The compiled regular expression
214 } // namespace lldb_private
216 #endif // liblldb_RegularExpression_h_