src/gromacs/utility/gmxregex.cpp

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  35 /*! \internal \file
  36  * \brief
  37  * Implements regular expression wrappers.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \ingroup module_utility
  41  */
  42 #include "gmxregex.h"
  43
  44 #include "config.h"
  45
  46 #if defined(HAVE_POSIX_REGEX)
  47 // old Mac needs sys/types.h before regex.h
  48 #include <sys/types.h>
  49 #include <regex.h>
  50 #define USE_POSIX_REGEX
  51 #elif defined(HAVE_CXX11_REGEX)
  52 #include <regex>
  53 #define USE_CXX11_REGEX
  54 #endif
  55
  56 #include "exceptions.h"
  57 #include "stringutil.h"
  58
  59 namespace gmx
  60 {
  61
  62 // static
  63 bool Regex::isSupported()
  64 {
  65 #if defined(USE_POSIX_REGEX) || defined(USE_CXX11_REGEX)
  66     return true;
  67 #else
  68     return false;
  69 #endif
  70 }
  71
  72 #if defined(USE_POSIX_REGEX)
  73 class Regex::Impl
  74 {
  75     public:
  76         explicit Impl(const char *value)
  77         {
  78             compile(value);
  79         }
  80         explicit Impl(const std::string &value)
  81         {
  82             compile(value.c_str());
  83         }
  84         ~Impl()
  85         {
  86             regfree(&regex_);
  87         }
  88
  89         bool match(const char *value) const
  90         {
  91             int rc = regexec(&regex_, value, 0, NULL, 0);
  92             if (rc != 0 && rc != REG_NOMATCH)
  93             {
  94                 // TODO: Handle errors.
  95             }
  96             return (rc == 0);
  97         }
  98
  99     private:
 100         void compile(const char *value)
 101         {
 102             std::string buf(formatString("^%s$", value));
 103             int         rc = regcomp(&regex_, buf.c_str(), REG_EXTENDED | REG_NOSUB);
 104             if (rc != 0)
 105             {
 106                 // TODO: Better error messages.
 107                 GMX_THROW(InvalidInputError(formatString(
 108                                                     "Error in regular expression \"%s\"", value)));
 109             }
 110         }
 111
 112         regex_t                 regex_;
 113 };
 114 #elif defined(USE_CXX11_REGEX)
 115 class Regex::Impl
 116 {
 117     public:
 118         explicit Impl(const char *value)
 119         try : regex_(value, std::regex::nosubs | std::regex::extended)
 120         {
 121         }
 122         catch (const std::regex_error &)
 123         {
 124             // TODO: Better error messages.
 125             GMX_THROW(InvalidInputError(formatString(
 126                                                 "Error in regular expression \"%s\"", value)));
 127         }
 128         explicit Impl(const std::string &value)
 129         try : regex_(value, std::regex::nosubs | std::regex::extended)
 130         {
 131         }
 132         catch (const std::regex_error &)
 133         {
 134             // TODO: Better error messages.
 135             GMX_THROW(InvalidInputError(formatString(
 136                                                 "Error in regular expression \"%s\"", value)));
 137         }
 138
 139         bool match(const char *value) const
 140         {
 141             try
 142             {
 143                 return std::regex_match(value, regex_);
 144             }
 145             catch (const std::regex_error &)
 146             {
 147                 // TODO: Handle errors.
 148                 return false;
 149             }
 150         }
 151
 152     private:
 153         std::regex              regex_;
 154 };
 155 #else
 156 class Regex::Impl
 157 {
 158     public:
 159         explicit Impl(const char * /*value*/)
 160         {
 161             GMX_THROW(NotImplementedError(
 162                               "Gromacs is compiled without regular expression support"));
 163         }
 164         explicit Impl(const std::string & /*value*/)
 165         {
 166             GMX_THROW(NotImplementedError(
 167                               "Gromacs is compiled without regular expression support"));
 168         }
 169
 170         bool match(const char * /*value*/) const
 171         {
 172             // Should never be reached.
 173             GMX_THROW(NotImplementedError(
 174                               "Gromacs is compiled without regular expression support"));
 175         }
 176 };
 177 #endif
 178
 179 Regex::Regex()
 180     : impl_(NULL)
 181 {
 182 }
 183
 184 Regex::Regex(const char *value)
 185     : impl_(new Impl(value))
 186 {
 187 }
 188
 189 Regex::Regex(const std::string &value)
 190     : impl_(new Impl(value))
 191 {
 192 }
 193
 194 Regex::~Regex()
 195 {
 196 }
 197
 198 /*! \cond libapi */
 199 bool regexMatch(const char *str, const Regex &regex)
 200 {
 201     if (regex.impl_.get() == NULL)
 202     {
 203         return false;
 204     }
 205     return regex.impl_->match(str);
 206 }
 207
 208 bool regexMatch(const std::string &str, const Regex &regex)
 209 {
 210     return regexMatch(str.c_str(), regex);
 211 }
 212 //! \endcond
 213
 214 } // namespace gmx