1// Protocol Buffers - Google's data interchange format
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30
31// Author: kenton@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
37namespace google {
38namespace protobuf {
39namespace strings {
40
41using internal::SubstituteArg;
42
43// Returns the number of args in arg_array which were passed explicitly
44// to Substitute().
45static 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
53string 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
66void 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