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      1 // Protocol Buffers - Google's data interchange format
      2 // Copyright 2008 Google Inc.  All rights reserved.
      3 // http://code.google.com/p/protobuf/
      4 //
      5 // Redistribution and use in source and binary forms, with or without
      6 // modification, are permitted provided that the following conditions are
      7 // met:
      8 //
      9 //     * Redistributions of source code must retain the above copyright
     10 // notice, this list of conditions and the following disclaimer.
     11 //     * Redistributions in binary form must reproduce the above
     12 // copyright notice, this list of conditions and the following disclaimer
     13 // in the documentation and/or other materials provided with the
     14 // distribution.
     15 //     * Neither the name of Google Inc. nor the names of its
     16 // contributors may be used to endorse or promote products derived from
     17 // this software without specific prior written permission.
     18 //
     19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 
     31 // Author: kenton (at) google.com (Kenton Varda)
     32 
     33 #include <google/protobuf/stubs/substitute.h>
     34 #include <google/protobuf/stubs/strutil.h>
     35 #include <google/protobuf/stubs/stl_util-inl.h>
     36 
     37 namespace google {
     38 namespace protobuf {
     39 namespace strings {
     40 
     41 using internal::SubstituteArg;
     42 
     43 // Returns the number of args in arg_array which were passed explicitly
     44 // to Substitute().
     45 static int CountSubstituteArgs(const SubstituteArg* const* args_array) {
     46   int count = 0;
     47   while (args_array[count] != NULL && args_array[count]->size() != -1) {
     48     ++count;
     49   }
     50   return count;
     51 }
     52 
     53 string Substitute(
     54     const char* format,
     55     const SubstituteArg& arg0, const SubstituteArg& arg1,
     56     const SubstituteArg& arg2, const SubstituteArg& arg3,
     57     const SubstituteArg& arg4, const SubstituteArg& arg5,
     58     const SubstituteArg& arg6, const SubstituteArg& arg7,
     59     const SubstituteArg& arg8, const SubstituteArg& arg9) {
     60   string result;
     61   SubstituteAndAppend(&result, format, arg0, arg1, arg2, arg3, arg4,
     62                                        arg5, arg6, arg7, arg8, arg9);
     63   return result;
     64 }
     65 
     66 void SubstituteAndAppend(
     67     string* output, const char* format,
     68     const SubstituteArg& arg0, const SubstituteArg& arg1,
     69     const SubstituteArg& arg2, const SubstituteArg& arg3,
     70     const SubstituteArg& arg4, const SubstituteArg& arg5,
     71     const SubstituteArg& arg6, const SubstituteArg& arg7,
     72     const SubstituteArg& arg8, const SubstituteArg& arg9) {
     73   const SubstituteArg* const args_array[] = {
     74     &arg0, &arg1, &arg2, &arg3, &arg4, &arg5, &arg6, &arg7, &arg8, &arg9, NULL
     75   };
     76 
     77   // Determine total size needed.
     78   int size = 0;
     79   for (int i = 0; format[i] != '\0'; i++) {
     80     if (format[i] == '$') {
     81       if (ascii_isdigit(format[i+1])) {
     82         int index = format[i+1] - '0';
     83         if (args_array[index]->size() == -1) {
     84           GOOGLE_LOG(DFATAL)
     85             << "strings::Substitute format string invalid: asked for \"$"
     86             << index << "\", but only " << CountSubstituteArgs(args_array)
     87             << " args were given.  Full format string was: \""
     88             << CEscape(format) << "\".";
     89           return;
     90         }
     91         size += args_array[index]->size();
     92         ++i;  // Skip next char.
     93       } else if (format[i+1] == '$') {
     94         ++size;
     95         ++i;  // Skip next char.
     96       } else {
     97         GOOGLE_LOG(DFATAL)
     98           << "Invalid strings::Substitute() format string: \""
     99           << CEscape(format) << "\".";
    100         return;
    101       }
    102     } else {
    103       ++size;
    104     }
    105   }
    106 
    107   if (size == 0) return;
    108 
    109   // Build the string.
    110   int original_size = output->size();
    111   STLStringResizeUninitialized(output, original_size + size);
    112   char* target = string_as_array(output) + original_size;
    113   for (int i = 0; format[i] != '\0'; i++) {
    114     if (format[i] == '$') {
    115       if (ascii_isdigit(format[i+1])) {
    116         const SubstituteArg* src = args_array[format[i+1] - '0'];
    117         memcpy(target, src->data(), src->size());
    118         target += src->size();
    119         ++i;  // Skip next char.
    120       } else if (format[i+1] == '$') {
    121         *target++ = '$';
    122         ++i;  // Skip next char.
    123       }
    124     } else {
    125       *target++ = format[i];
    126     }
    127   }
    128 
    129   GOOGLE_DCHECK_EQ(target - output->data(), output->size());
    130 }
    131 
    132 }  // namespace strings
    133 }  // namespace protobuf
    134 }  // namespace google
    135