temporal | 40ee551 | 2008-07-10 02:12:20 +0000 | [diff] [blame^] | 1 | // Protocol Buffers - Google's data interchange format |
| 2 | // Copyright 2008 Google Inc. |
| 3 | // http://code.google.com/p/protobuf/ |
| 4 | // |
| 5 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | // you may not use this file except in compliance with the License. |
| 7 | // You may obtain a copy of the License at |
| 8 | // |
| 9 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | // |
| 11 | // Unless required by applicable law or agreed to in writing, software |
| 12 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | // See the License for the specific language governing permissions and |
| 15 | // limitations under the License. |
| 16 | |
| 17 | // Author: kenton@google.com (Kenton Varda) |
| 18 | |
| 19 | #include <google/protobuf/stubs/substitute.h> |
| 20 | #include <google/protobuf/stubs/strutil.h> |
| 21 | #include <google/protobuf/stubs/stl_util-inl.h> |
| 22 | |
| 23 | namespace google { |
| 24 | namespace protobuf { |
| 25 | namespace strings { |
| 26 | |
| 27 | using internal::SubstituteArg; |
| 28 | |
| 29 | // Returns the number of args in arg_array which were passed explicitly |
| 30 | // to Substitute(). |
| 31 | static int CountSubstituteArgs(const SubstituteArg* const* args_array) { |
| 32 | int count = 0; |
| 33 | while (args_array[count] != NULL && args_array[count]->size() != -1) { |
| 34 | ++count; |
| 35 | } |
| 36 | return count; |
| 37 | } |
| 38 | |
| 39 | string Substitute( |
| 40 | const char* format, |
| 41 | const SubstituteArg& arg0, const SubstituteArg& arg1, |
| 42 | const SubstituteArg& arg2, const SubstituteArg& arg3, |
| 43 | const SubstituteArg& arg4, const SubstituteArg& arg5, |
| 44 | const SubstituteArg& arg6, const SubstituteArg& arg7, |
| 45 | const SubstituteArg& arg8, const SubstituteArg& arg9) { |
| 46 | string result; |
| 47 | SubstituteAndAppend(&result, format, arg0, arg1, arg2, arg3, arg4, |
| 48 | arg5, arg6, arg7, arg8, arg9); |
| 49 | return result; |
| 50 | } |
| 51 | |
| 52 | void SubstituteAndAppend( |
| 53 | string* output, const char* format, |
| 54 | const SubstituteArg& arg0, const SubstituteArg& arg1, |
| 55 | const SubstituteArg& arg2, const SubstituteArg& arg3, |
| 56 | const SubstituteArg& arg4, const SubstituteArg& arg5, |
| 57 | const SubstituteArg& arg6, const SubstituteArg& arg7, |
| 58 | const SubstituteArg& arg8, const SubstituteArg& arg9) { |
| 59 | const SubstituteArg* const args_array[] = { |
| 60 | &arg0, &arg1, &arg2, &arg3, &arg4, &arg5, &arg6, &arg7, &arg8, &arg9, NULL |
| 61 | }; |
| 62 | |
| 63 | // Determine total size needed. |
| 64 | int size = 0; |
| 65 | for (int i = 0; format[i] != '\0'; i++) { |
| 66 | if (format[i] == '$') { |
| 67 | if (ascii_isdigit(format[i+1])) { |
| 68 | int index = format[i+1] - '0'; |
| 69 | if (args_array[index]->size() == -1) { |
| 70 | GOOGLE_LOG(DFATAL) |
| 71 | << "strings::Substitute format string invalid: asked for \"$" |
| 72 | << index << "\", but only " << CountSubstituteArgs(args_array) |
| 73 | << " args were given. Full format string was: \"" |
| 74 | << CEscape(format) << "\"."; |
| 75 | return; |
| 76 | } |
| 77 | size += args_array[index]->size(); |
| 78 | ++i; // Skip next char. |
| 79 | } else if (format[i+1] == '$') { |
| 80 | ++size; |
| 81 | ++i; // Skip next char. |
| 82 | } else { |
| 83 | GOOGLE_LOG(DFATAL) |
| 84 | << "Invalid strings::Substitute() format string: \"" |
| 85 | << CEscape(format) << "\"."; |
| 86 | return; |
| 87 | } |
| 88 | } else { |
| 89 | ++size; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | if (size == 0) return; |
| 94 | |
| 95 | // Build the string. |
| 96 | int original_size = output->size(); |
| 97 | STLStringResizeUninitialized(output, original_size + size); |
| 98 | char* target = string_as_array(output) + original_size; |
| 99 | for (int i = 0; format[i] != '\0'; i++) { |
| 100 | if (format[i] == '$') { |
| 101 | if (ascii_isdigit(format[i+1])) { |
| 102 | const SubstituteArg* src = args_array[format[i+1] - '0']; |
| 103 | memcpy(target, src->data(), src->size()); |
| 104 | target += src->size(); |
| 105 | ++i; // Skip next char. |
| 106 | } else if (format[i+1] == '$') { |
| 107 | *target++ = '$'; |
| 108 | ++i; // Skip next char. |
| 109 | } |
| 110 | } else { |
| 111 | *target++ = format[i]; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | GOOGLE_DCHECK_EQ(target - output->data(), output->size()); |
| 116 | } |
| 117 | |
| 118 | } // namespace strings |
| 119 | } // namespace protobuf |
| 120 | } // namespace google |