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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Author: kenton@google.com (Kenton Varda)
#include <google/protobuf/stubs/substitute.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/stubs/stl_util-inl.h>
namespace google {
namespace protobuf {
namespace strings {
using internal::SubstituteArg;
// Returns the number of args in arg_array which were passed explicitly
// to Substitute().
static int CountSubstituteArgs(const SubstituteArg* const* args_array) {
int count = 0;
while (args_array[count] != NULL && args_array[count]->size() != -1) {
++count;
}
return count;
}
string Substitute(
const char* format,
const SubstituteArg& arg0, const SubstituteArg& arg1,
const SubstituteArg& arg2, const SubstituteArg& arg3,
const SubstituteArg& arg4, const SubstituteArg& arg5,
const SubstituteArg& arg6, const SubstituteArg& arg7,
const SubstituteArg& arg8, const SubstituteArg& arg9) {
string result;
SubstituteAndAppend(&result, format, arg0, arg1, arg2, arg3, arg4,
arg5, arg6, arg7, arg8, arg9);
return result;
}
void SubstituteAndAppend(
string* output, const char* format,
const SubstituteArg& arg0, const SubstituteArg& arg1,
const SubstituteArg& arg2, const SubstituteArg& arg3,
const SubstituteArg& arg4, const SubstituteArg& arg5,
const SubstituteArg& arg6, const SubstituteArg& arg7,
const SubstituteArg& arg8, const SubstituteArg& arg9) {
const SubstituteArg* const args_array[] = {
&arg0, &arg1, &arg2, &arg3, &arg4, &arg5, &arg6, &arg7, &arg8, &arg9, NULL
};
// Determine total size needed.
int size = 0;
for (int i = 0; format[i] != '\0'; i++) {
if (format[i] == '$') {
if (ascii_isdigit(format[i+1])) {
int index = format[i+1] - '0';
if (args_array[index]->size() == -1) {
GOOGLE_LOG(DFATAL)
<< "strings::Substitute format string invalid: asked for \"$"
<< index << "\", but only " << CountSubstituteArgs(args_array)
<< " args were given. Full format string was: \""
<< CEscape(format) << "\".";
return;
}
size += args_array[index]->size();
++i; // Skip next char.
} else if (format[i+1] == '$') {
++size;
++i; // Skip next char.
} else {
GOOGLE_LOG(DFATAL)
<< "Invalid strings::Substitute() format string: \""
<< CEscape(format) << "\".";
return;
}
} else {
++size;
}
}
if (size == 0) return;
// Build the string.
int original_size = output->size();
STLStringResizeUninitialized(output, original_size + size);
char* target = string_as_array(output) + original_size;
for (int i = 0; format[i] != '\0'; i++) {
if (format[i] == '$') {
if (ascii_isdigit(format[i+1])) {
const SubstituteArg* src = args_array[format[i+1] - '0'];
memcpy(target, src->data(), src->size());
target += src->size();
++i; // Skip next char.
} else if (format[i+1] == '$') {
*target++ = '$';
++i; // Skip next char.
}
} else {
*target++ = format[i];
}
}
GOOGLE_DCHECK_EQ(target - output->data(), output->size());
}
} // namespace strings
} // namespace protobuf
} // namespace google
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